:root {
  --bg: #F5F8FB;
  --bg-alt: #EEF2F7;
  --surface: #FFFFFF;
  --surface-soft: #F8FAFC;
  --surface-strong: #F5F8FB;
  --line: rgba(15, 23, 42, 0.06);
  --divider: rgba(15, 23, 42, 0.05);
  --text: #0F172A;
  --text-sec: #64748B;
  --text-ter: #94A3B8;
  --muted: #64748B;
  --blue: #3B82F6;
  --blue-dark: #1D4ED8;
  --green: #10B981;
  --red: #EF4444;
  --amber: #F59E0B;
  --shadow: 0 20px 48px rgba(15, 23, 42, 0.12);
  --card-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --radius-lg: 26px;
  --radius-md: 20px;
  --radius-sm: 16px;
  --transition-flip: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: "Pretendard Variable", "Pretendard", -apple-system, sans-serif;
  --ease-standard: cubic-bezier(0.22, 1, 0.36, 1);
  --motion-fast: 150ms;
  --motion-medium: 280ms;
  --motion-slow: 480ms;
}

/* ── Base ─────────────────────────────────────────── */

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: #D8E4EF;
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.hidden {
  display: none !important;
}

/* ── App shell & tabs ─────────────────────────────── */

.app-shell {
  max-width: 430px;
  min-height: 100vh;
  margin: 0 auto;
  padding-bottom: 80px;
  background: var(--bg);
  box-shadow: 0 34px 80px rgba(15, 23, 42, 0.22);
  overflow: hidden;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: tab-enter var(--motion-medium) var(--ease-standard);
}

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--surface);
  border-top: 1px solid var(--divider);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 100;
}

.tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border: none;
  background: transparent;
  color: var(--text-ter);
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 12px;
  transition: color var(--motion-fast) var(--ease-standard);
}

.tab-btn.active {
  color: var(--blue);
}

.tab-icon {
  font-size: 1.5rem;
  line-height: 1;
  transition: transform var(--motion-fast) var(--ease-standard);
}

.tab-icon-svg {
  width: 1.5rem;
  height: 1.5rem;
  display: block;
  flex-shrink: 0;
  transition: transform var(--motion-fast) var(--ease-standard);
}

.tab-icon-svg path {
  fill: currentColor;
}

.tab-label {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: -0.2px;
}

.tab-btn.active .tab-label {
  font-weight: 700;
}

.tab-btn.active .tab-icon,
.tab-btn.active .tab-icon-svg {
  transform: translateY(-1px) scale(1.08);
}

/* ── Home tab ─────────────────────────────────────── */

.dashboard-header {
  padding: 16px 16px 0;
  display: grid;
  gap: 12px;
}

.home-collection-panel {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
}

.home-collection-trigger {
  width: 100%;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: transform var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
}

.home-collection-trigger:hover {
  transform: translateY(-1px);
  border-color: rgba(79, 156, 249, 0.45);
  box-shadow: var(--card-shadow);
}

.home-collection-trigger-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.home-collection-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 700;
}

.home-collection-action i {
  transition: transform var(--motion-fast) var(--ease-standard);
}

.home-collection-trigger[aria-expanded="true"] .home-collection-action i {
  transform: rotate(180deg);
}

.home-section-label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.home-collection-title {
  margin: 8px 0 0;
  font-size: 1.5rem;
  line-height: 1.2;
}

.home-collection-desc {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ── Hero card (streak + goal ring) ──────────────── */

.hero-card {
  position: relative;
  margin: 0 16px;
  padding: 22px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff;
  box-shadow: 0 12px 32px rgba(59, 130, 246, 0.3);
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero-blob-1 {
  top: -40px;
  right: -40px;
  width: 160px;
  height: 160px;
  background: rgba(255, 255, 255, 0.12);
}

.hero-blob-2 {
  bottom: -60px;
  right: 30px;
  width: 120px;
  height: 120px;
  background: rgba(255, 255, 255, 0.07);
}

.hero-card-main {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.hero-streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: -0.1px;
  width: fit-content;
}

.hero-streak-count {
  margin-top: 12px;
  font-size: 52px;
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.hero-streak-unit {
  font-size: 20px;
  margin-left: 4px;
  font-weight: 600;
  opacity: 0.9;
  letter-spacing: -0.5px;
}

.hero-streak-sub {
  margin-top: 6px;
  font-size: 13px;
  opacity: 0.85;
  letter-spacing: -0.2px;
}

.hero-right {
  flex-shrink: 0;
  position: relative;
}

.streak-week-strip {
  position: relative;
  margin-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.streak-weekday-chip {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.streak-weekday-chip-label {
  font-size: 10px;
  opacity: 0.75;
  color: #fff;
}

.streak-weekday-chip-dot {
  width: 28px;
  height: 28px;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
}

.streak-weekday-chip.is-done .streak-weekday-chip-dot {
  background: rgba(255, 255, 255, 0.95);
}

.streak-weekday-chip.is-today .streak-weekday-chip-dot {
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.streak-weekday-chip-check {
  display: none;
  width: 14px;
  height: 14px;
}

.streak-weekday-chip.is-done .streak-weekday-chip-check {
  display: block;
  color: var(--blue-dark);
}

/* legacy: used by JS */
.streak-icon { display: none; }
.streak-count { font-size: 52px; font-weight: 800; font-variant-numeric: tabular-nums; }
.streak-label { display: none; }

.collection-picker {
  display: grid;
  gap: 10px;
  padding: 0 16px;
  margin-top: 16px;
}

.collection-card {
  width: 100%;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: transform var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
  animation: rise-in var(--motion-medium) var(--ease-standard) both;
}

.collection-card:hover {
  transform: translateY(-1px);
  border-color: rgba(79, 156, 249, 0.45);
  box-shadow: var(--card-shadow);
}

.collection-card:disabled {
  opacity: 0.6;
  cursor: wait;
}

.collection-card.selected {
  border-color: rgba(59, 130, 246, 0.55);
  background:
    radial-gradient(circle at top right, rgba(59, 130, 246, 0.10), transparent 36%),
    var(--surface);
}

.collection-card-top,
.collection-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.collection-domain,
.collection-selected-badge {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.collection-domain {
  background: rgba(15, 23, 42, 0.06);
  color: var(--muted);
  text-transform: uppercase;
}

.collection-selected-badge {
  background: rgba(79, 156, 249, 0.16);
  color: var(--blue);
}

.collection-card-title {
  display: block;
  margin-top: 12px;
  font-size: 1rem;
}

.collection-card-desc {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.55;
}

.collection-card-meta {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.78rem;
}

.collection-modal-panel {
  max-height: min(76vh, 680px);
  overflow: auto;
}

.collection-modal-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.collection-modal-panel .collection-picker {
  padding: 0;
  margin-top: 0;
}

.streak-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.streak-count {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.streak-label {
  color: var(--muted);
  font-size: 0.82rem;
}

.daily-goal-ring-wrap {
  position: relative;
  width: 96px;
  height: 96px;
}

.goal-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.goal-ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.25);
  stroke-width: 7;
}

.goal-ring-fill {
  fill: none;
  stroke: #fff;
  stroke-width: 7;
  stroke-linecap: round;
  stroke-dasharray: 326.73 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.goal-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
}

#goal-current {
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.goal-ring-text span {
  font-size: 0.68rem;
  opacity: 0.8;
  margin-top: 2px;
}

.chapter-picker {
  padding: 0 16px;
  margin-top: 16px;
}

.header-chapter-picker {
  width: 100%;
  padding: 0;
  margin-top: 0;
}

.chapter-combobox {
  position: relative;
  width: 100%;
}

.chapter-combobox-trigger {
  width: 100%;
  min-height: 52px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 0.92rem;
  outline: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--motion-fast) var(--ease-standard), transform var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
}

.chapter-combobox-trigger:hover {
  transform: translateY(-1px);
  border-color: rgba(79, 156, 249, 0.45);
}

.chapter-combobox-trigger:disabled {
  opacity: 0.55;
  cursor: default;
}

.chapter-combobox.is-open .chapter-combobox-trigger {
  border-color: rgba(79, 156, 249, 0.55);
  box-shadow: var(--card-shadow);
}

.chapter-combobox-value {
  min-width: 0;
  flex: 1;
  font-weight: 600;
  line-height: 1.45;
}

.chapter-combobox-caret {
  flex-shrink: 0;
  color: var(--muted);
  transition: transform var(--motion-fast) var(--ease-standard);
}

.chapter-combobox.is-open .chapter-combobox-caret {
  transform: rotate(180deg);
}

.chapter-combobox-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 30;
  display: grid;
  gap: 6px;
  max-height: min(320px, calc(100vh - 140px));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: fade-up var(--motion-fast) var(--ease-standard);
}

.chapter-combobox-option {
  width: 100%;
  padding: 12px 14px;
  border: none;
  border-radius: 14px;
  background: transparent;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  cursor: pointer;
  transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard), transform var(--motion-fast) var(--ease-standard);
}

.chapter-combobox-option:hover {
  background: rgba(59, 130, 246, 0.06);
  transform: translateY(-1px);
}

.chapter-combobox-option.is-selected {
  background: rgba(79, 156, 249, 0.14);
  color: var(--blue);
}

.chapter-combobox-option-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chapter-combobox-option-code {
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.chapter-combobox-option-name {
  color: inherit;
  line-height: 1.45;
}

.chapter-combobox-option-check {
  flex-shrink: 0;
}


.home-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0 16px;
  margin-top: 16px;
}

.home-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  padding: 0 16px;
  margin-top: 12px;
}

.home-action-card {
  position: relative;
  width: 100%;
  appearance: none;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: left;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: transform var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
}

.home-action-card-tint {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--blue);
}

.home-action-card-tint.amber {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
}

.home-action-card.secondary .home-action-card-tint {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
}

.home-action-card.secondary[data-alert-state="current"] {
  border-color: rgba(16, 185, 129, 0.5);
  background: rgba(16, 185, 129, 0.06);
}

.home-action-card.secondary[data-alert-state="other"] {
  border-color: rgba(239, 68, 68, 0.5);
  background: rgba(239, 68, 68, 0.06);
}

.home-action-card:hover {
  transform: translateY(-1px);
  border-color: rgba(59, 130, 246, 0.35);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.home-action-card.secondary:hover {
  border-color: rgba(245, 158, 11, 0.35);
}

.home-action-card:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.home-action-card.has-alert:disabled {
  opacity: 0.92;
}

.home-action-kicker {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-sec);
  letter-spacing: -0.2px;
}

.home-action-value {
  display: block;
  margin-top: 2px;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.6px;
}

.home-action-meta {
  display: block;
  margin-top: 2px;
  font-size: 0.78rem;
  color: var(--text-ter);
}

.home-section {
  padding: 0 16px;
  margin-top: 20px;
}

.home-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 4px;
  margin-bottom: 12px;
}

.home-section-title {
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.home-section-action {
  border: none;
  background: transparent;
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: -0.2px;
  cursor: pointer;
  padding: 4px 0;
}

.current-set-card {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22), 0 4px 16px rgba(0, 0, 0, 0.18);
}

.current-set-main {
  display: flex;
  align-items: center;
  gap: 14px;
}

.current-set-icon {
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.16), rgba(59, 130, 246, 0.06));
}

.current-set-icon i {
  font-size: 1.5rem;
}

.current-set-info {
  min-width: 0;
  flex: 1;
}

.current-set-name {
  color: var(--text);
  font-size: 0.96rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.3px;
}

.current-set-sub {
  margin-top: 2px;
  color: var(--text-sec);
  font-size: 0.79rem;
  line-height: 1.45;
  word-break: keep-all;
}

.current-set-progress-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.current-set-bar-wrap {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg-alt);
}

.current-set-bar {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--blue);
  transition: width 0.6s var(--ease-standard);
}

.current-set-fraction {
  min-width: 48px;
  color: var(--text-sec);
  font-size: 0.76rem;
  font-weight: 800;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.current-set-buttons {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  margin-top: 16px;
}

.current-set-buttons.has-wrong-action {
  grid-template-columns: minmax(0, 1fr) minmax(124px, 136px);
}

.set-action-btn {
  position: relative;
  min-height: 52px;
  padding: 0 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.25px;
  cursor: pointer;
  overflow: visible;
  transition: transform var(--motion-fast) var(--ease-standard), opacity var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
}

.set-action-btn.secondary {
  padding-left: 14px;
  padding-right: 14px;
}

.set-action-btn.primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.28);
}

.set-action-btn.secondary {
  background: var(--surface);
  border-color: var(--line);
  color: var(--text);
}

.home-wrong-btn {
  min-width: 124px;
  padding-left: 12px;
  padding-right: 12px;
}

.set-action-btn:not(:disabled):hover {
  transform: translateY(-1px);
}

.set-action-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.set-action-count {
  font-variant-numeric: tabular-nums;
}

.mission-card {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22), 0 4px 16px rgba(0, 0, 0, 0.16);
}

.mission-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mission-icon {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-alt);
  color: var(--text-sec);
}

.mission-icon.done {
  background: var(--blue);
  color: #fff;
}

.mission-icon i {
  font-size: 1rem;
}

.mission-info {
  min-width: 0;
  flex: 1;
}

.mission-title {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.3px;
}

.mission-title.is-complete {
  opacity: 0.62;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
}

.mission-sub {
  margin-top: 2px;
  color: var(--text-sec);
  font-size: 0.78rem;
}

.mission-icon.done + .mission-info .mission-sub {
  color: var(--blue);
  font-weight: 700;
}

.mission-divider {
  height: 1px;
  margin: 14px 0;
  background: var(--divider);
}

.complete-msg {
  margin: 16px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-sec);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  line-height: 1.45;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4px;
}


/* ── Buttons ──────────────────────────────────────── */

.primary-button {
  display: block;
  width: calc(100% - 32px);
  margin: 16px auto 0;
  min-height: 52px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--blue);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: -0.2px;
  box-shadow: 0 4px 12px rgba(59,130,246,0.28);
  transition: transform var(--motion-fast), box-shadow var(--motion-fast);
}

.primary-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(59,130,246,0.38);
}

.primary-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.secondary-button {
  display: block;
  width: calc(100% - 32px);
  margin: 16px auto 0;
  min-height: 52px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: -0.2px;
  transition: transform var(--motion-fast), border-color var(--motion-fast);
}

.secondary-button:hover {
  transform: translateY(-1px);
  border-color: rgba(59,130,246,0.35);
}

.secondary-button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.danger-button {
  display: block;
  width: calc(100% - 32px);
  margin: 16px auto 0;
  min-height: 52px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(239, 68, 68, 0.35);
  background: rgba(239, 68, 68, 0.1);
  color: var(--red);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: -0.2px;
  transition: transform var(--motion-fast), background var(--motion-fast);
}

.danger-button:hover {
  transform: translateY(-1px);
  background: rgba(239, 68, 68, 0.16);
}

.danger-button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.complete-msg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  color: var(--green);
  font-weight: 700;
  padding: 12px;
}

.complete-msg i {
  font-size: 1.1rem;
}

.icon-button {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface);
  color: var(--text-sec);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: background var(--motion-fast), color var(--motion-fast);
}

.icon-button:hover {
  background: rgba(15,23,42,0.06);
  color: var(--text);
}

.icon-button i {
  font-size: 1.1rem;
  line-height: 1;
}

.modal-close-plain {
  width: auto;
  height: auto;
  padding: 4px;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
}

.modal-close-plain i {
  font-size: 0.9rem;
}

/* ── Study tab ────────────────────────────────────── */

.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--muted);
  line-height: 1.6;
}

.study-empty-title {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
}

.study-empty-desc {
  margin: 10px auto 0;
  max-width: 28rem;
  font-size: 0.95rem;
}

.study-empty-actions {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.study-empty-actions .primary-button,
.study-empty-actions .secondary-button {
  width: 100%;
  margin: 0;
}

.study-empty-meta {
  margin: 14px 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.study-topbar {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--divider);
}

.study-heading h2 {
  margin: 4px 0 0;
  font-size: 1rem;
  line-height: 1.3;
}

.study-type-label {
  margin: 4px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.study-counter {
  font-size: 0.9rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.subject-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.subject-badge.subject-1 {
  background: rgba(79, 156, 249, 0.14);
  color: var(--blue);
}

.subject-badge.subject-2 {
  background: rgba(56, 217, 169, 0.14);
  color: var(--green);
}

.subject-badge.subject-3 {
  background: rgba(245, 158, 11, 0.16);
  color: var(--amber);
}

.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 12px 16px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  overflow: hidden;
}

.mode-btn {
  min-height: 40px;
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s, color 0.2s;
}

.mode-btn.active {
  background: var(--surface-soft);
  color: var(--text);
  font-weight: 700;
}

.study-stage {
  padding: 16px;
}

/* 3D Flip card */

.flip-card {
  perspective: 1200px;
  cursor: pointer;
}

.flip-card-inner {
  position: relative;
  min-height: 320px;
  transform-style: preserve-3d;
  transition: transform var(--transition-flip);
}

.flip-card.is-flipped .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--surface);
  backface-visibility: hidden;
}

.flip-back {
  transform: rotateY(180deg);
}

.face-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.face-content {
  flex: 1;
  display: flex;
  align-items: center;
}

.face-front-text {
  justify-content: center;
  text-align: center;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.45;
  word-break: keep-all;
}

.quiz-stem-text {
  width: 100%;
}

.quiz-context-panel {
  width: 100%;
  margin-top: 14px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 650;
  line-height: 1.55;
}

.quiz-context-title {
  margin-bottom: 8px;
  color: var(--text-sec);
  font-size: 0.78rem;
  font-weight: 800;
}

.quiz-context-line + .quiz-context-line {
  margin-top: 4px;
}

.quiz-context-table-panel {
  overflow-x: auto;
}

.quiz-context-table {
  width: 100%;
  min-width: 360px;
  border-collapse: collapse;
  table-layout: fixed;
}

.quiz-context-table th,
.quiz-context-table td {
  padding: 7px 8px;
  border: 1px solid var(--line);
  text-align: center;
  vertical-align: middle;
  word-break: keep-all;
}

.quiz-context-table th {
  background: rgba(59, 130, 246, 0.08);
  color: var(--text-sec);
  font-size: 0.78rem;
  font-weight: 800;
}

.face-back-text {
  align-items: flex-start;
  white-space: pre-wrap;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--text);
}

.eval-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.eval-btn {
  min-height: 56px;
  border-radius: var(--radius-md);
  border-width: 1.5px;
  border-style: solid;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.eval-wrong {
  background: rgba(248, 113, 113, 0.12);
  border-color: rgba(248, 113, 113, 0.4);
  color: var(--red);
}

.eval-correct {
  background: rgba(56, 217, 169, 0.12);
  border-color: rgba(56, 217, 169, 0.4);
  color: var(--green);
}

.eval-wrong:hover {
  background: rgba(248, 113, 113, 0.22);
}

.eval-correct:hover {
  background: rgba(56, 217, 169, 0.22);
}

.quiz-card {
  min-height: 160px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.quiz-card-general {
  border-color: rgba(59, 130, 246, 0.2);
}

.quiz-card-function {
  border-color: rgba(16, 185, 129, 0.25);
  background: rgba(16, 185, 129, 0.04);
}

.quiz-card-function .face-label {
  color: var(--green);
}

.quiz-card-function .face-front-text {
  justify-content: flex-start;
  text-align: left;
  font-size: 1.35rem;
  line-height: 1.55;
}

.quiz-choices {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 12px;
}

.quiz-feedback {
  margin-top: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  animation: fade-up var(--motion-medium) var(--ease-standard);
}

.quiz-feedback.correct {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.06);
}

.quiz-feedback.wrong {
  border-color: rgba(239, 68, 68, 0.4);
  background: rgba(239, 68, 68, 0.06);
}

.quiz-feedback-label {
  margin: 0 0 10px;
  font-size: 0.9rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-feedback.correct .quiz-feedback-label {
  color: var(--green);
}

.quiz-feedback.wrong .quiz-feedback-label {
  color: var(--red);
}

.quiz-feedback-answer {
  white-space: normal;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text);
  opacity: 0.9;
}

.feedback-learning-grid {
  display: grid;
  gap: 9px;
}

.feedback-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
  padding: 8px 0;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
}

.feedback-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.feedback-row-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  justify-self: start;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 7px;
  background: rgba(148, 163, 184, 0.12);
  color: var(--text-sec);
  font-size: 0.76rem;
  font-weight: 800;
}

.feedback-row-text {
  min-width: 0;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 650;
  line-height: 1.45;
  overflow-wrap: anywhere;
  word-break: keep-all;
}

.feedback-row.answer .feedback-row-label {
  background: rgba(16, 185, 129, 0.12);
  color: var(--green);
}

.feedback-row.answer .feedback-row-text {
  font-weight: 850;
}

.feedback-row.selected .feedback-row-label {
  background: rgba(239, 68, 68, 0.11);
  color: var(--red);
}

.feedback-row.core .feedback-row-text {
  color: var(--text-sec);
  font-weight: 650;
}

.feedback-detail {
  margin-top: 2px;
  padding-top: 8px;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
}

.feedback-detail summary {
  cursor: pointer;
  color: var(--text-sec);
  font-size: 0.82rem;
  font-weight: 800;
  user-select: none;
}

.feedback-detail-body {
  max-height: 126px;
  margin-top: 8px;
  overflow: auto;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(148, 163, 184, 0.08);
  color: var(--text-sec);
  font-size: 0.86rem;
  line-height: 1.55;
}

.quiz-next-btn {
  width: 100%;
  min-height: 52px;
  margin-top: 14px;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--blue);
  color: #fff;
  font-size: 0.96rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: -0.2px;
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3);
  transition: transform var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
}

.quiz-next-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

.choice-btn {
  min-height: 56px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  padding: 14px 16px;
  font-size: 0.95rem;
  line-height: 1.4;
  white-space: normal;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background var(--motion-fast) var(--ease-standard),
              border-color var(--motion-fast) var(--ease-standard),
              transform 80ms;
}

.choice-btn:not(:disabled):hover {
  background: rgba(59, 130, 246, 0.05);
  transform: translateY(-1px);
}

.choice-btn-label {
  width: 28px;
  min-width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--bg-alt);
  color: var(--text-sec);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  flex-shrink: 0;
  transition: background var(--motion-fast), color var(--motion-fast);
}

.choice-btn.correct {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.5);
  color: var(--text);
}

.choice-btn.correct .choice-btn-label {
  background: var(--green);
  color: #fff;
}

.choice-btn.wrong {
  background: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.5);
  color: var(--text);
}

.choice-btn.wrong .choice-btn-label {
  background: var(--red);
  color: #fff;
}

.progress-dots {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
  padding: 0 16px;
}

.progress-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.12);
}

.progress-dot.seen {
  background: rgba(15, 23, 42, 0.32);
}

.progress-dot.active {
  background: var(--blue);
  box-shadow: 0 0 0 4px rgba(79, 156, 249, 0.2);
}

.study-result {
  padding: 40px 16px;
  text-align: center;
}

.daily-goal-choice-modal {
  position: fixed;
  inset: 0;
  z-index: 8200;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(15, 23, 42, 0.46);
  backdrop-filter: blur(8px);
}

.daily-goal-choice-panel {
  width: min(100%, 360px);
  padding: 24px 20px 20px;
  border: 1px solid rgba(59, 130, 246, 0.16);
  border-radius: 22px;
  background: var(--bg-alt);
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.24);
  text-align: center;
}

.daily-goal-choice-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 14px;
  border-radius: 18px;
  color: var(--green);
  background: rgba(16, 185, 129, 0.12);
}

.daily-goal-choice-icon i {
  font-size: 28px;
}

.daily-goal-choice-panel h3 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--text);
}

.daily-goal-choice-panel p {
  margin: 9px 0 18px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.daily-goal-choice-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.daily-goal-choice-actions .primary-button,
.daily-goal-choice-actions .secondary-button {
  min-height: 48px;
  padding: 0 12px;
}

.result-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 24px;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.result-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.result-value {
  font-size: 1.8rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.result-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.result-item.correct .result-value {
  color: var(--green);
}

.result-item.wrong .result-value {
  color: var(--red);
}

/* ── Review tab ───────────────────────────────────── */

.tab-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0;
  padding: 20px 16px 4px;
  letter-spacing: -0.5px;
}

.review-tab-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 16px 12px;
}

.review-tab-header .tab-title {
  padding: 0;
}

.review-tab-note {
  margin: 0 0 0 auto;
  flex: 1;
  text-align: right;
  color: var(--text-ter);
  font-size: 0.66rem;
  line-height: 1.35;
}

.chapter-picker.review-chapter-picker {
  margin-top: 0;
  padding: 0 16px;
}

.review-selected-summary {
  padding: 10px 16px 0;
}

.review-selected-summary-card {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
}

.review-selected-summary-card.subject-1 {
  border-color: rgba(79, 156, 249, 0.28);
}

.review-selected-summary-card.subject-2 {
  border-color: rgba(56, 217, 169, 0.28);
}

.review-selected-summary-card.subject-3 {
  border-color: rgba(245, 158, 11, 0.3);
}

.review-selected-summary-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.review-selected-summary-title {
  margin: 12px 0 0;
  font-size: 1rem;
  line-height: 1.35;
}

.review-selected-summary-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--muted);
}

.review-section-title {
  margin: 22px 16px 10px;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--muted);
}

.stage-review-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 0 16px;
}

.stage-review-card {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  text-align: left;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
}

.stage-review-card:hover {
  transform: translateY(-2px);
  border-color: rgba(79, 156, 249, 0.4);
}

.stage-review-card.is-disabled {
  opacity: 0.58;
  cursor: default;
  pointer-events: none;
}

.stage-review-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.stage-review-card-title {
  margin: 10px 0 0;
  font-size: 0.96rem;
  line-height: 1.35;
}

.stage-review-card-meta {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

.chapter-card {
  width: 100%;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s;
}

.chapter-card:hover {
  transform: translateY(-2px);
}

.chapter-card.is-disabled {
  opacity: 0.58;
  cursor: default;
  pointer-events: none;
}

.chapter-card.is-disabled:hover {
  transform: none;
}

.chapter-card.subject-1:hover {
  border-color: rgba(79, 156, 249, 0.5);
}

.chapter-card.subject-2:hover {
  border-color: rgba(56, 217, 169, 0.5);
}

.chapter-card.subject-3:hover {
  border-color: rgba(245, 158, 11, 0.52);
}

.chapter-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chapter-number {
  color: var(--muted);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.chapter-title {
  margin: 10px 0 0;
  font-size: 0.98rem;
  line-height: 1.4;
}

.chapter-card-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--muted);
}

.review-card-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 16px;
}

.review-action-group {
  margin-top: 4px;
}

.review-action-group .primary-button,
.review-action-group .secondary-button {
  margin-top: 12px;
}

.review-mode-note {
  margin: 12px 16px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.5;
}

.review-card-item {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.review-card-front {
  font-size: 0.9rem;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.wrong-cards-btn {
  margin: 12px 16px 0 !important;
  width: calc(100% - 32px) !important;
}

/* ── Stats tab ────────────────────────────────────── */

.stats-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 16px 12px;
}

.today-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  padding: 0 16px;
  margin-bottom: 20px;
}

.summary-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 16px;
  animation: rise-in var(--motion-medium) var(--ease-standard) both;
}

.summary-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.5px;
}

.summary-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.summary-label {
  font-size: 0.78rem;
  color: var(--muted);
}

.today-stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 14px 10px;
  text-align: center;
}

.today-stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.today-stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
}

.section-title {
  padding: 0 16px;
  margin: 0 0 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.2px;
}

.heatmap {
  padding: 0 16px;
  margin-bottom: 20px;
}

.heatmap-panel {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 16px 14px;
  animation: rise-in var(--motion-medium) var(--ease-standard) both;
}

.heatmap-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.heatmap-month-label {
  font-size: 0.95rem;
  font-weight: 700;
}

.heatmap-month-total {
  font-size: 0.76rem;
  color: var(--muted);
}

.heatmap-weekdays,
.heatmap-calendar {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  max-width: 292px;
  margin: 0 auto;
}

.heatmap-weekdays {
  margin-bottom: 6px;
}

.heatmap-weekday {
  text-align: center;
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 700;
}

.heatmap-spacer {
  aspect-ratio: 1;
}

.heatmap-cell {
  aspect-ratio: 1;
  min-height: 36px;
  border-radius: 10px;
  background: rgba(79, 156, 249, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard);
  animation: fade-up var(--motion-medium) var(--ease-standard) both;
}

.heatmap-cell.level-1 {
  background: rgba(79, 156, 249, 0.3);
}

.heatmap-cell.level-2 {
  background: rgba(79, 156, 249, 0.6);
}

.heatmap-cell.level-3 {
  background: rgba(79, 156, 249, 1.0);
}

.heatmap-cell.today {
  box-shadow: 0 0 0 2px rgba(79, 156, 249, 0.9);
  color: var(--text);
}

.heatmap-day {
  font-size: 0.72rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text-sec);
}

.part-stats {
  display: grid;
  gap: 10px;
  padding: 0 16px;
  margin-bottom: 20px;
}

.part-stat-card {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  animation: rise-in var(--motion-medium) var(--ease-standard) both;
}

.part-stat-card.subject-1 {
  border-color: rgba(79, 156, 249, 0.24);
}

.part-stat-card.subject-2 {
  border-color: rgba(56, 217, 169, 0.26);
}

.part-stat-card.subject-3 {
  border-color: rgba(245, 158, 11, 0.28);
}

.part-stat-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.part-stat-kicker {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.part-stat-title {
  margin: 6px 0 0;
  font-size: 1rem;
  line-height: 1.35;
}

.part-stat-meta {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.part-stat-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 14px;
}

.part-metric {
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  padding: 10px 8px;
  text-align: center;
}

.part-metric-value {
  display: block;
  font-size: 1.05rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.part-metric-label {
  display: block;
  margin-top: 4px;
  font-size: 0.72rem;
  color: var(--muted);
}

.box-chart {
  padding: 0 16px;
  margin-bottom: 20px;
}

.badge-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding: 0 16px;
  margin-bottom: 20px;
}

.badge-item {
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface-soft);
  display: flex;
  align-items: center;
  gap: 12px;
}

.badge-item.earned {
  border-color: rgba(79, 156, 249, 0.4);
  background: rgba(79, 156, 249, 0.08);
}

.badge-icon {
  width: 36px;
  min-width: 36px;
  text-align: center;
  color: var(--blue);
}

.badge-icon i {
  font-size: 1.5rem;
  line-height: 1;
}

.badge-info {
  flex: 1;
  min-width: 0;
}

.badge-name {
  font-size: 0.88rem;
  font-weight: 700;
}

.badge-date {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 2px;
}

.badge-desc {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 2px;
}

.badge-item:not(.earned) .badge-name {
  color: var(--muted);
}

/* ── Settings overlay ─────────────────────────────── */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: flex-end;
}

.overlay-panel {
  background: var(--bg-alt);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border-top: 1px solid var(--line);
  padding: 20px;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
}

.overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.overlay-header h3 {
  margin: 0;
  font-size: 1.1rem;
}

.setting-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1.5px solid var(--line);
  font-size: 0.95rem;
}

.setting-row select {
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 6px 12px;
  font-size: 0.9rem;
}

#reset-data-btn {
  margin-top: 0;
}

/* ── Toast notification ───────────────────────────── */

.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1E293B;
  color: #F1F5F9;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 200;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast i {
  font-size: 1rem;
  line-height: 1;
}

.goal-achieved {
  animation: celebrate 0.6s ease;
}

@keyframes tab-enter {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes soft-pop {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.session-enter {
  animation: fade-up var(--motion-medium) var(--ease-standard) both;
}

.card-enter {
  animation: soft-pop var(--motion-medium) var(--ease-standard) both;
}

.choices-enter .choice-btn {
  animation: fade-up var(--motion-medium) var(--ease-standard) both;
}

.choices-enter .choice-btn:nth-child(1) { animation-delay: 0ms; }
.choices-enter .choice-btn:nth-child(2) { animation-delay: 40ms; }
.choices-enter .choice-btn:nth-child(3) { animation-delay: 80ms; }
.choices-enter .choice-btn:nth-child(4) { animation-delay: 120ms; }

.feedback-enter,
.result-enter {
  animation: fade-up var(--motion-medium) var(--ease-standard) both;
}

@keyframes celebrate {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* ── Responsive ───────────────────────────────────── */

@media (min-width: 761px) {
  .app-shell {
    padding: 28px 20px 90px;
  }

  .flip-card-inner {
    min-height: 380px;
  }

  .face-front-text {
    font-size: 2rem;
  }

  .badge-list {
    grid-template-columns: repeat(4, 1fr);
  }

  .today-summary {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    padding: 0 20px;
  }

  .home-actions {
    padding: 0 20px;
  }

  .chapter-picker {
    padding: 0 20px;
  }

  .chapter-picker.header-chapter-picker {
    padding: 0;
  }

  .streak-row {
    padding: 0 20px;
  }

  .heatmap,
  .part-stats {
    padding: 0 20px;
  }

  .part-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Box distribution */
.box-distribution {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.box-row {
  display: grid;
  grid-template-columns: 5.6rem 1fr 2.5rem;
  align-items: center;
  gap: 0.5rem;
}

.box-label {
  font-size: 0.75rem;
  color: var(--muted);
  text-align: left;
  line-height: 1.2;
}

.box-bar-wrap {
  background: var(--surface-soft);
  border-radius: var(--radius-sm);
  height: 10px;
  overflow: hidden;
}

.box-bar {
  height: 100%;
  border-radius: var(--radius-sm);
  transition: width 0.4s ease;
  min-width: 0;
}

.box-level-1 { background: var(--red); }
.box-level-2 { background: #f97316; }
.box-level-3 { background: #eab308; }
.box-level-4 { background: #22c55e; }
.box-level-5 { background: var(--blue); }

.box-count {
  font-size: 0.75rem;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ── Review tab additions ─────────────────────────── */

.due-highlight {
  color: var(--blue);
  font-weight: 700;
}

.box-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  text-align: center;
}

.box-badge.box-level-1 { background: rgba(239,68,68,0.15); color: var(--red); }
.box-badge.box-level-2 { background: rgba(249,115,22,0.15); color: #f97316; }
.box-badge.box-level-3 { background: rgba(234,179,8,0.15); color: #eab308; }
.box-badge.box-level-4 { background: rgba(34,197,94,0.15); color: var(--green); }
.box-badge.box-level-5 { background: rgba(59,130,246,0.15); color: var(--blue); }

.empty-msg {
  text-align: center;
  color: var(--muted);
  padding: 2rem;
  font-size: 0.9rem;
}

/* ── Full reference-style redesign pass ───────────── */

.app-shell {
  width: min(100%, 430px);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}

.tab-bar {
  grid-template-columns: repeat(5, 1fr);
  padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
}

.tab-btn {
  min-width: 0;
  padding: 8px 6px;
}

.design-screen-header {
  padding: 8px 20px 18px;
}

.design-screen-title {
  margin: 0;
  color: var(--text);
  font-size: 26px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.6px;
}

.design-screen-subtitle,
.stats-subtitle {
  margin: 4px 0 0;
  color: var(--text-sec);
  font-size: 13.5px;
  line-height: 1.5;
  letter-spacing: -0.2px;
}

.home-collection-panel,
.current-set-card,
.home-action-card,
.mission-card,
.summary-item,
.heatmap-panel,
.part-stat-card,
.badge-item,
.review-selected-summary-card,
.stage-review-card,
.review-card-item,
.empty-state,
.quiz-card,
.quiz-feedback,
.result-item {
  background: var(--surface);
  border-color: var(--line);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

.study-topbar {
  padding: 8px 16px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.study-heading {
  min-width: 0;
  flex: 1;
}

.study-heading-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.study-counter {
  min-width: 48px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 800;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.study-progress-track {
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface-soft);
}

.study-progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: var(--blue);
  transition: width 260ms var(--ease-standard);
}

.study-stage {
  padding: 12px 20px 0;
}

.quiz-topic-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.10);
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: -0.2px;
}

.quiz-topic-pill span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.study-type-label {
  margin: 12px 0 0;
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.quiz-card {
  min-height: 148px;
  margin-top: 16px;
  padding: 18px;
  border-radius: 18px;
}

.face-front-text,
.quiz-card-function .face-front-text {
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
  color: var(--text);
  font-size: 22px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.6px;
}

.quiz-choices {
  margin-top: 24px;
  gap: 10px;
}

.choice-btn {
  min-height: 58px;
  padding: 16px;
  border-radius: 16px;
  border-width: 1.5px;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.choice-btn-label {
  width: 28px;
  min-width: 28px;
  height: 28px;
  border-radius: 8px;
}

.quiz-feedback {
  margin-top: 20px;
  border-radius: 18px;
}

.quiz-next-btn,
.primary-button {
  min-height: 52px;
  border-radius: var(--radius-sm);
  background: var(--blue);
  font-weight: 800;
}

.progress-dots {
  padding-bottom: 16px;
}

.study-result {
  padding: 40px 20px;
}

.result-title {
  margin: 0 0 24px;
  font-size: 26px;
  letter-spacing: -0.6px;
}

.result-stats {
  gap: 10px;
}

.result-item {
  border-radius: 18px;
}

.review-quick-actions {
  display: grid;
  gap: 12px;
  padding: 0 20px;
  margin-bottom: 28px;
}

.review-quick-action {
  width: 100%;
  min-height: 84px;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
  transition: transform var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard);
}

.review-quick-action:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(59, 130, 246, 0.36);
}

.review-quick-action:disabled {
  opacity: 0.48;
  cursor: default;
}

.review-quick-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  color: var(--blue);
  background: rgba(59, 130, 246, 0.16);
}

.review-quick-icon.danger {
  color: var(--blue);
  background: rgba(59, 130, 246, 0.16);
}

.review-quick-icon.amber {
  color: var(--amber);
  background: rgba(245, 158, 11, 0.16);
}

.review-quick-icon.violet {
  color: #818cf8;
  background: rgba(99, 102, 241, 0.18);
}

.review-quick-icon i {
  font-size: 22px;
}

.review-quick-copy {
  min-width: 0;
  flex: 1;
  display: grid;
  gap: 2px;
}

.review-quick-copy strong {
  font-size: 15px;
  line-height: 1.3;
  letter-spacing: -0.3px;
}

.review-quick-copy span {
  color: var(--text-sec);
  font-size: 12.5px;
}

.review-quick-badge {
  min-width: 30px;
  height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.review-quick-badge.violet {
  background: #6366f1;
}

.memory-due-token {
  position: absolute;
  top: 12px;
  right: 12px;
  min-width: 34px;
  height: 24px;
  padding: 0 7px;
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 900;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.18);
  pointer-events: none;
  z-index: 2;
}

.review-quick-chevron {
  color: var(--text-ter);
  font-size: 16px;
}

.review-section-title,
.section-title {
  margin: 22px 20px 12px;
  padding: 0;
  color: var(--text);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.review-selected-summary,
.review-card-list,
.stage-review-list,
.today-summary,
.heatmap,
.part-stats,
.badge-list {
  padding-left: 20px;
  padding-right: 20px;
}

.stage-review-card,
.part-stat-card {
  background: var(--surface);
  border-radius: var(--radius-md);
}

.stats-header {
  display: block;
}

.today-summary {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0;
  margin-bottom: 24px;
}

.summary-item {
  min-height: 86px;
  align-items: flex-start;
  justify-content: center;
  padding: 14px 12px;
}

.summary-value {
  color: var(--text);
  font-size: 1.28rem;
}

.heatmap-panel {
  padding: 18px;
}

.badge-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.badge-item {
  aspect-ratio: 1;
  padding: 10px;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  border-radius: 18px;
}

.badge-desc,
.badge-date {
  display: none;
}

.settings-profile-card,
.settings-group-card {
  margin: 0 20px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

.settings-profile-card {
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.settings-avatar {
  width: 56px;
  height: 56px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.settings-profile-copy {
  flex: 1;
  min-width: 0;
  display: grid;
  gap: 2px;
}

.settings-profile-copy strong {
  color: var(--text);
  font-size: 16px;
  letter-spacing: -0.3px;
}

.settings-profile-copy span {
  color: var(--text-sec);
  font-size: 12.5px;
}

.settings-profile-btn {
  border: none;
  border-radius: 999px;
  padding: 8px 14px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.settings-group {
  margin-top: 20px;
}

.settings-group-title {
  margin: 0;
  padding: 0 28px 8px;
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.settings-group-card {
  overflow: hidden;
}

.setting-row {
  width: 100%;
  min-height: 64px;
  padding: 14px 16px;
  border: 0;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
  background: transparent;
  text-align: left;
}

.setting-row-button {
  cursor: pointer;
}

.setting-row-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  color: var(--text-sec);
  background: rgba(15, 23, 42, 0.06);
}

.setting-row-icon.primary {
  color: var(--blue);
  background: rgba(59, 130, 246, 0.12);
}

.setting-row-icon.amber {
  color: var(--amber);
  background: rgba(245, 158, 11, 0.16);
}

.setting-row-icon.violet {
  color: #818cf8;
  background: rgba(99, 102, 241, 0.18);
}

.setting-row-icon.danger {
  color: var(--red);
  background: rgba(239, 68, 68, 0.15);
}

.setting-row-copy {
  min-width: 0;
  flex: 1;
  display: grid;
  gap: 2px;
}

.setting-row-copy strong {
  color: var(--text);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.setting-row-copy small {
  color: var(--text-sec);
  font-size: 12px;
}

.setting-row select {
  min-width: 76px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 700;
}

.setting-text-input {
  width: min(210px, 44vw);
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  padding: 8px 10px;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
}

.auth-status-text {
  display: block;
  margin-top: 3px;
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 800;
}

.auth-modal-panel {
  max-width: 420px;
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 4px;
  border-radius: 999px;
  background: var(--surface-soft);
  margin-bottom: 16px;
}

.auth-tab {
  border: 0;
  border-radius: 999px;
  background: transparent;
  padding: 10px 12px;
  color: var(--text-sec);
  font-weight: 900;
  cursor: pointer;
}

.auth-tab.active {
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow-soft);
}

.auth-form {
  display: grid;
  gap: 12px;
}

.auth-form label {
  display: grid;
  gap: 6px;
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 900;
}

.auth-form input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: var(--card);
  color: var(--text);
  font: inherit;
  font-weight: 800;
}

.auth-submit-btn {
  width: 100%;
  justify-content: center;
  margin-top: 2px;
}

.auth-message {
  min-height: 20px;
  margin: 12px 0 0;
  color: var(--text-sec);
  font-size: 13px;
  font-weight: 800;
}

.auth-message.error {
  color: var(--red);
}

.admin-users-card {
  padding-bottom: 8px;
}

.admin-users-list {
  display: grid;
  gap: 8px;
  padding: 0 12px 12px 64px;
}

.admin-user-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}

.admin-user-row-copy {
  min-width: 0;
  flex: 1;
  display: grid;
  gap: 2px;
}

.admin-user-row-copy strong {
  color: var(--text);
  font-size: 13px;
  font-weight: 900;
}

.admin-user-row-copy span {
  color: var(--text-sec);
  font-size: 12px;
  overflow-wrap: anywhere;
}

.admin-user-delete-btn {
  border: 0;
  border-radius: 10px;
  padding: 8px 10px;
  background: rgba(239, 68, 68, 0.12);
  color: var(--red);
  font-weight: 900;
  cursor: pointer;
}

.setting-divider {
  height: 1px;
  margin-left: 64px;
  background: var(--divider);
}

.settings-switch {
  width: 44px;
  height: 26px;
  border-radius: 999px;
  padding: 3px;
  background: var(--surface-soft);
  display: inline-flex;
  justify-content: flex-start;
}

.settings-switch::before {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text-sec);
}

.settings-switch.is-on {
  justify-content: flex-end;
  background: var(--blue);
}

.settings-switch.is-on::before {
  background: #fff;
}

.setting-chevron,
.settings-version {
  color: var(--text-ter);
  font-size: 13px;
  font-weight: 700;
}

.danger-setting .setting-row-copy strong {
  color: var(--red);
}

/* ── Second fidelity pass: study entry and result ─── */

.empty-state {
  padding: 0 0 32px;
  text-align: left;
  color: var(--text);
  background: transparent !important;
  border: 0;
  box-shadow: none !important;
}

.study-empty-header {
  padding-bottom: 16px;
}

.study-empty-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 0 20px;
  margin-top: 12px;
}

.study-empty-metric {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  display: flex;
  align-items: center;
  gap: 12px;
}

.study-empty-metric-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.study-empty-metric-icon.primary {
  color: var(--blue);
  background: rgba(59, 130, 246, 0.12);
}

.study-empty-metric-icon.amber {
  color: var(--amber);
  background: rgba(245, 158, 11, 0.16);
}

.study-empty-metric-copy {
  display: grid;
  gap: 1px;
}

.study-empty-metric-copy strong {
  color: var(--text);
  font-size: 22px;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.study-empty-metric-copy small {
  color: var(--text-sec);
  font-size: 12px;
}

.study-empty-actions {
  padding: 0 20px;
  margin-top: 16px;
}

.study-empty-meta {
  margin: 14px 20px 0;
  color: var(--text-ter);
  text-align: center;
}

.study-result {
  min-height: calc(100vh - 80px);
  padding: 34px 20px 40px;
  display: flex;
  flex-direction: column;
  text-align: center;
}

.result-accuracy-ring {
  position: relative;
  width: 180px;
  height: 180px;
  margin: 0 auto;
}

.result-accuracy-svg {
  width: 180px;
  height: 180px;
  transform: rotate(-90deg);
}

.result-accuracy-ring-bg,
.result-accuracy-ring-progress {
  fill: none;
  stroke-width: 14;
}

.result-accuracy-ring-bg {
  stroke: var(--surface-soft);
}

.result-accuracy-ring-progress {
  stroke: var(--blue);
  stroke-linecap: round;
  stroke-dasharray: 477.52;
  stroke-dashoffset: 477.52;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.result-accuracy-copy {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.result-accuracy-copy strong {
  color: var(--text);
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -1.5px;
  font-variant-numeric: tabular-nums;
}

.result-accuracy-copy span {
  margin-top: -2px;
  color: var(--text-sec);
  font-size: 22px;
  font-weight: 800;
}

.result-accuracy-copy small {
  margin-top: 4px;
  color: var(--text-sec);
  font-size: 13px;
  font-weight: 700;
}

.result-title {
  margin: 20px 0 0;
  font-size: 24px;
}

.result-message {
  margin: 6px 0 0;
  color: var(--text-sec);
  font-size: 14px;
  line-height: 1.45;
  letter-spacing: -0.2px;
}

.result-stats {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  margin-bottom: 0;
}

.result-item {
  flex: 1;
  padding: 16px 10px;
  gap: 6px;
}

.result-item i {
  font-size: 17px;
  line-height: 1;
}

.result-item.correct i,
.result-item.correct .result-value {
  color: var(--green);
}

.result-item.wrong i,
.result-item.wrong .result-value {
  color: var(--red);
}

.result-item.time i {
  color: var(--blue);
}

.result-streak-card {
  margin-top: 22px;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
}

.result-streak-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  color: var(--amber);
  background: rgba(245, 158, 11, 0.16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.result-streak-copy {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.result-streak-copy strong {
  color: var(--text);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.result-streak-copy small {
  color: var(--text-sec);
  font-size: 12.5px;
}

.result-actions {
  display: grid;
  gap: 10px;
  margin-top: auto;
  padding-top: 24px;
}

.result-actions .primary-button,
.result-actions .secondary-button {
  width: 100%;
  margin: 0;
}

.result-review-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--blue);
  background: rgba(59, 130, 246, 0.10);
  border-color: transparent;
}

/* ── Stats fidelity pass ──────────────────────────── */

.today-summary {
  display: flex;
  gap: 10px;
  padding: 0 20px;
  margin: 0 0 24px;
}

.stats-kpi-tile {
  flex: 1;
  min-width: 0;
  padding: 16px 12px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

.stats-kpi-icon {
  width: 22px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  color: var(--blue);
}

.stats-kpi-icon.success {
  color: var(--green);
}

.stats-kpi-icon.amber {
  color: var(--amber);
}

.stats-kpi-label {
  display: block;
  margin-top: 2px;
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.2px;
  white-space: nowrap;
}

.stats-kpi-value {
  display: block;
  margin-top: 8px;
  color: var(--text);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.6px;
  font-variant-numeric: tabular-nums;
}

.stats-kpi-sub {
  display: block;
  margin-top: 4px;
  color: var(--text-ter);
  font-size: 11px;
  line-height: 1.25;
}

.heatmap {
  padding: 0 20px;
  margin-bottom: 24px;
}

.heatmap-panel {
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--surface);
}

.stats-heatmap-wrap {
  display: flex;
  gap: 4px;
}

.stats-heatmap-weekdays {
  width: 16px;
  display: grid;
  grid-template-rows: repeat(7, 16px);
  gap: 4px;
  padding-right: 4px;
}

.stats-heatmap-weekdays span {
  color: var(--text-ter);
  font-size: 10px;
  line-height: 16px;
}

.stats-heatmap-weeks {
  flex: 1;
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(7, 16px);
  grid-auto-columns: minmax(8px, 1fr);
  gap: 4px;
}

.stats-heatmap-cell {
  display: block;
  width: 100%;
  height: 16px;
  border-radius: 4px;
  background: var(--surface-soft);
}

.stats-heatmap-cell.level-1 {
  background: rgba(59, 130, 246, 0.22);
}

.stats-heatmap-cell.level-2 {
  background: rgba(59, 130, 246, 0.44);
}

.stats-heatmap-cell.level-3 {
  background: rgba(59, 130, 246, 0.68);
}

.stats-heatmap-cell.level-4 {
  background: var(--blue);
}

.stats-heatmap-cell.today {
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.6);
}

.stats-heatmap-legend {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  color: var(--text-sec);
  font-size: 11px;
}

.stats-heatmap-legend .stats-heatmap-cell {
  width: 12px;
  height: 12px;
  flex: 0 0 12px;
  border-radius: 3px;
}

.part-stats {
  display: block;
  padding: 0 20px;
  margin-bottom: 24px;
}

.part-progress-panel {
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

.part-progress-row {
  display: grid;
  gap: 8px;
}

.part-progress-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.part-progress-title {
  min-width: 0;
  color: var(--text);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: -0.3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.part-progress-meta {
  flex: 0 0 auto;
  color: var(--text-sec);
  font-size: 12px;
  font-weight: 700;
}

.part-progress-meta strong {
  color: var(--blue);
}

.part-progress-caption {
  color: var(--text-ter);
  font-size: 11.5px;
  font-weight: 650;
}

.part-progress-track {
  height: 6px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface-soft);
}

.part-progress-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--blue);
  transition: width 0.6s var(--ease-standard);
}

.part-progress-divider {
  height: 1px;
  margin: 16px 0;
  background: var(--divider);
}

.badge-list {
  display: block;
  padding: 0;
  margin-bottom: 24px;
}

.achievement-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 20px;
  color: var(--text);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.achievement-header span:last-child {
  color: var(--text-sec);
  font-size: 13px;
}

.achievement-strip {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 20px 4px;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}

.achievement-strip::-webkit-scrollbar {
  display: none;
}

.achievement-strip .badge-item {
  width: 92px;
  min-width: 92px;
  height: 96px;
  padding: 12px 10px;
  border-radius: 18px;
  background: var(--surface);
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  text-align: center;
  opacity: 0.42;
  scroll-snap-align: start;
}

.achievement-strip .badge-item.earned {
  opacity: 1;
  border-color: var(--line);
  background: var(--surface);
}

.achievement-strip .badge-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--blue);
  background: rgba(59, 130, 246, 0.16);
}

.achievement-strip .badge-icon i {
  font-size: 20px;
}

.achievement-strip .badge-info {
  flex: 0 0 auto;
  min-width: 0;
}

.achievement-strip .badge-name {
  display: block;
  color: var(--text);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: -0.2px;
  line-height: 1.2;
  word-break: keep-all;
}

/* ── Reference layout pass ───────────────────────── */

.dashboard-header {
  display: block;
  padding: 16px 20px 0;
}

.home-header-simple {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.home-header-set-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.4;
}

.home-header-set-name {
  color: var(--muted);
}

.home-header-set-caret {
  font-size: 0.7rem;
  color: var(--muted);
  opacity: 0.7;
}

.home-header-chapter-btn.chapter-combobox-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.home-header-chapter-btn .chapter-combobox-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.home-header-chapter-btn .chapter-combobox-caret {
  font-size: 0.85rem;
  color: var(--muted);
}

.hero-card {
  margin: 16px 20px 0;
}

.home-section {
  padding: 0 20px;
  margin-top: 20px;
}

.home-actions {
  padding: 0 20px;
}

.current-set-buttons {
  grid-template-columns: minmax(0, 1fr);
}

.current-set-buttons.has-wrong-action {
  grid-template-columns: minmax(0, 1fr) minmax(124px, 136px);
}

.set-action-btn.secondary {
  min-width: 104px;
}

.home-wrong-btn {
  min-width: 124px;
}

.tab-bar {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  padding: 8px 10px calc(8px + env(safe-area-inset-bottom));
}

.tab-btn {
  min-width: 0;
  padding: 8px 6px;
}

/* ── Study tab chapter list ───────────────────────── */

.study-chapter-list {
  padding: 0 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.study-chapter-section-header {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--text-sec);
}

.study-chapter-section-rows {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.study-chapter-row {
  width: 100%;
  min-height: 64px;
  padding: 14px 16px;
  border: none;
  border-bottom: 1px solid var(--divider);
  background: transparent;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  cursor: pointer;
  transition: background var(--motion-fast) var(--ease-standard);
}

.study-chapter-row:last-child {
  border-bottom: none;
}

.study-chapter-row:hover {
  background: rgba(59, 130, 246, 0.04);
}

.study-chapter-row:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.study-chapter-row-num {
  flex: 0 0 auto;
  font-size: 11px;
  font-weight: 800;
  color: var(--text-ter);
  letter-spacing: 0.1em;
  min-width: 36px;
}

.study-chapter-row-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.study-chapter-row-name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.study-chapter-row-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
}

.study-chapter-row-meta-new {
  color: var(--blue);
}

.study-chapter-row-meta-review {
  color: var(--amber);
}

.study-chapter-row-meta-done {
  color: var(--green);
}

.study-chapter-row-meta-total {
  color: var(--text-ter);
}

.study-chapter-row-meta-sep {
  color: var(--text-ter);
  font-weight: 400;
}

.study-chapter-row-chevron {
  flex: 0 0 auto;
  color: var(--text-ter);
  font-size: 14px;
}

/* ── Study tab picker UI ──────────────────────────── */

.study-picker-area {
  padding: 0 20px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.study-picker-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.study-picker-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-sec);
  min-width: 36px;
}

.study-picker-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--line);
  background: var(--surface);
  color: var(--text-ter);
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--motion-fast) var(--ease-standard);
}

.study-picker-btn.filled {
  color: var(--text);
  border-color: var(--blue);
}

.study-picker-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.study-start-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--set-color, var(--blue));
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 4px;
  box-shadow: 0 4px 14px color-mix(in srgb, var(--set-color, var(--blue)) 35%, transparent);
  transition: opacity var(--motion-fast) var(--ease-standard);
}

.study-start-btn:hover { opacity: 0.9; }
.study-start-btn:disabled { opacity: 0.35; cursor: not-allowed; box-shadow: none; }

/* ── Study picker modals ──────────────────────────── */

.study-picker-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: env(safe-area-inset-bottom);
}

.study-picker-modal-panel {
  width: 100%;
  max-width: 760px;
  max-height: 75vh;
  max-height: min(82vh, calc(100vh - 16px));
  max-height: min(82dvh, calc(100dvh - 16px));
  min-height: 0;
  background: var(--surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.study-picker-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--divider);
  flex-shrink: 0;
}

.study-picker-modal-title {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.study-picker-modal-list {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-gutter: stable;
  padding: 12px 20px calc(32px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 모달 내 세트 아이템 */
.spicker-item {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--line);
  background: var(--surface);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--motion-fast) var(--ease-standard),
              background var(--motion-fast) var(--ease-standard);
}

.spicker-item:hover { background: rgba(59,130,246,0.02); }

.spicker-item.active {
  border-color: var(--blue);
  background: rgba(59,130,246,0.04);
}

.spicker-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.spicker-info { flex: 1; min-width: 0; }

.spicker-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.spicker-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.3px;
  flex: 1;
  min-width: 0;
}

.spicker-badge {
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  flex-shrink: 0;
}

.spicker-check {
  color: var(--blue);
  font-size: 16px;
  flex-shrink: 0;
}

.spicker-desc {
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-sec);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.spicker-progress-row {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.spicker-bar-wrap {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: var(--bg-alt);
  overflow: hidden;
}

.spicker-bar {
  height: 100%;
  border-radius: 999px;
}

.spicker-fraction {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-sec);
  min-width: 44px;
  text-align: right;
}

.spicker-subject {
  margin: 8px 0 4px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--text-ter);
}

/* ── 온보딩 투어 ─────────────────────────────────── */

.tour-overlay {
  position: fixed;
  inset: 0;
  z-index: 9000;
  pointer-events: none;
}

.tour-overlay.active {
  pointer-events: auto;
}

.tour-overlay::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 0;
}

.tour-highlight-box {
  position: fixed;
  z-index: 1;
  border-radius: 12px;
  box-shadow: 0 0 0 4px var(--blue), 0 0 0 9999px rgba(0,0,0,0.55);
  transition: top 0.35s cubic-bezier(.4,0,.2,1),
              left 0.35s cubic-bezier(.4,0,.2,1),
              width 0.35s cubic-bezier(.4,0,.2,1),
              height 0.35s cubic-bezier(.4,0,.2,1);
  pointer-events: none;
}

.tour-card {
  position: fixed;
  z-index: 2;
  left: 16px;
  right: 16px;
  bottom: 24px;
  background: var(--surface);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.28);
  max-height: 60vh;
  display: flex;
  flex-direction: column;
}

.tour-card-step {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 6px;
}

.tour-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.3px;
  margin-bottom: 8px;
}

.tour-card-desc {
  font-size: 0.9rem;
  color: var(--text-sec);
  line-height: 1.6;
  margin-bottom: 20px;
  overflow-y: auto;
  white-space: pre-line;
  flex: 1;
}

.tour-card-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.tour-skip-btn {
  background: none;
  border: none;
  font-size: 0.85rem;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
}

.tour-next-btn {
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
}