:root {
  --bg: #f6eee8;
  --bg-accent: #f4ddd2;
  --surface: rgba(255, 251, 247, 0.92);
  --surface-strong: #fff8f4;
  --stroke: #e7d3c9;
  --stroke-strong: #dfc1b0;
  --text: #5c4338;
  --muted: #8c6d61;
  --primary: #e7a487;
  --primary-strong: #d98462;
  --primary-soft: #f8e3d9;
  --accent: #efc8b8;
  --success: #86b691;
  --danger: #cb6f66;
  --shadow: 0 26px 50px rgba(186, 146, 125, 0.18);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --font-ui: "Avenir Next", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-mono: "SFMono-Regular", "Menlo", monospace;
}

* {
  box-sizing: border-box;
}

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

body {
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.7), transparent 28%),
    radial-gradient(circle at bottom right, rgba(239, 200, 184, 0.35), transparent 22%),
    linear-gradient(135deg, #f8f1eb 0%, #f6e9e0 52%, #f3ddd3 100%);
  color: var(--text);
  font-family: var(--font-ui);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 28px;
}

.content-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
}

.main-column {
  min-width: 0;
}

.card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.topbar,
.hero,
.panel,
.sidebar-card {
  padding: 24px 28px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 24px;
  background:
    linear-gradient(135deg, rgba(255, 250, 246, 0.98), rgba(248, 233, 225, 0.98)),
    var(--surface);
}

.topbar h1 {
  margin: 6px 0 8px;
  font-size: 2.6rem;
  line-height: 1.05;
}

.subcopy,
.translation-help,
.mode-help,
.status-line,
.feedback-line,
.tips-list,
.hero p,
.info-card p,
.empty-state,
.session-list small {
  color: var(--muted);
}

.eyebrow,
.section-label,
.hero-label {
  margin: 0;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.76rem;
  font-weight: 700;
}

.topbar-stats {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(112px, 1fr));
}

.top-pill,
.study-pill {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 248, 244, 0.9);
  border: 1px solid rgba(231, 211, 201, 0.85);
}

.top-pill.accent,
.study-pill.accent,
.mini-card.teddy {
  background: linear-gradient(135deg, #ffe8da, #f6ddd4);
}

.top-pill span,
.study-pill span,
.mini-card span,
.sidebar-metric span {
  color: var(--muted);
  font-size: 0.92rem;
}

.top-pill strong,
.study-pill strong,
.mini-card strong,
.sidebar-metric strong {
  font-size: 1.5rem;
}

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

.hero h2 {
  margin: 8px 0 12px;
  font-size: 2rem;
  line-height: 1.15;
}

.hero-badges,
.question-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--muted);
  font-weight: 700;
}

.tabs {
  display: flex;
  gap: 12px;
  margin: 20px 0 18px;
}

.tab-button,
.mode-button,
.soft-button,
.ghost-button,
.primary-button {
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.tab-button:hover,
.mode-button:hover,
.soft-button:hover,
.ghost-button:hover,
.primary-button:hover {
  transform: translateY(-1px);
}

.tab-button {
  background: rgba(255, 250, 246, 0.8);
  color: var(--muted);
  border-color: var(--stroke);
}

.tab-button.is-active,
.mode-button.is-selected {
  background: var(--primary);
  color: #fff8f5;
  box-shadow: 0 14px 22px rgba(217, 132, 98, 0.24);
}

.panel {
  display: none;
}

.panel.is-active {
  display: block;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.panel-heading h3,
.table-toolbar h4,
.question-card h4,
.info-card h4 {
  margin: 8px 0 0;
  font-size: 1.6rem;
}

.dashboard-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.mini-card,
.info-card,
.mode-card,
.study-card,
.table-card {
  background: var(--surface-strong);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
}

.mini-card {
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.split-section {
  display: grid;
  gap: 16px;
  grid-template-columns: 1.1fr 0.9fr;
  margin-bottom: 18px;
}

.info-card,
.table-card,
.mode-card,
.study-card {
  padding: 20px;
}

.table-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-end;
  margin-bottom: 16px;
}

.search-box,
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.search-box span,
.field span {
  font-size: 0.92rem;
  color: var(--muted);
  font-weight: 700;
}

input[type="text"],
input[type="search"] {
  width: 100%;
  min-height: 58px;
  padding: 0 18px;
  border-radius: 18px;
  border: 2px solid var(--stroke);
  background: #fffdfb;
  color: var(--text);
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(231, 164, 135, 0.16);
}

.word-list {
  display: grid;
  gap: 12px;
}

.word-row {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.4fr) auto auto;
  gap: 12px;
  align-items: center;
  padding: 16px;
  border-radius: 18px;
  background: #fffefc;
  border: 1px solid rgba(231, 211, 201, 0.9);
}

.word-row strong {
  font-size: 1.05rem;
}

.word-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 0.88rem;
}

.word-translations {
  color: var(--muted);
}

.inline-actions {
  display: flex;
  gap: 10px;
}

.inline-actions button,
.translation-chip button {
  border: 0;
  background: none;
  color: var(--muted);
}

.word-form {
  display: grid;
  gap: 18px;
}

.translation-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.translation-actions,
.form-actions,
.stack-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.translation-list {
  display: grid;
  gap: 12px;
}

.translation-chip {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
}

.translation-chip input {
  min-height: 54px;
}

.soft-button {
  background: var(--primary-soft);
  color: var(--muted);
}

.ghost-button {
  background: transparent;
  border-color: var(--stroke);
  color: var(--muted);
}

.ghost-button.danger {
  color: var(--danger);
  border-color: rgba(203, 111, 102, 0.35);
}

.primary-button {
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #fff8f4;
  box-shadow: 0 14px 22px rgba(217, 132, 98, 0.24);
}

.study-layout {
  display: grid;
  gap: 16px;
  grid-template-columns: 320px minmax(0, 1fr);
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.mode-button {
  background: #fffdfb;
  border-color: var(--stroke);
  color: var(--muted);
}

.study-card {
  min-height: 460px;
}

.study-placeholder,
.study-session {
  height: 100%;
}

.study-placeholder {
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
}

.teddy-cloud {
  display: grid;
  place-items: center;
  width: 86px;
  height: 86px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, #fbe7da, #f3d7cc);
  font-size: 2rem;
}

.study-session {
  display: grid;
  gap: 18px;
}

.study-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.question-card {
  padding: 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #fffdfa, #fff6ef);
  border: 1px solid var(--stroke);
}

.question-card h4 {
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 1.1;
}

.answer-form {
  display: grid;
  gap: 16px;
}

.feedback-line {
  min-height: 28px;
  margin: 0;
  font-weight: 700;
}

.feedback-line.success {
  color: var(--success);
}

.feedback-line.error {
  color: var(--danger);
}

.progress-bar {
  width: 100%;
  height: 18px;
  border-radius: 999px;
  background: #efdfd6;
  overflow: hidden;
}

.progress-bar-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #dea389);
  transition: width 180ms ease;
}

.session-list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 14px 0 0;
  list-style: none;
}

.session-list li {
  padding: 14px 16px;
  border-radius: 16px;
  background: #fffdfb;
  border: 1px solid rgba(231, 211, 201, 0.9);
}

.sidebar {
  position: sticky;
  top: 24px;
  display: grid;
  gap: 16px;
}

.sidebar-card {
  padding: 22px;
}

.sidebar-metric {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid rgba(231, 211, 201, 0.75);
}

.sidebar-metric:last-child {
  border-bottom: 0;
}

.teddy-panel {
  background: linear-gradient(180deg, rgba(255, 248, 244, 0.98), rgba(248, 226, 216, 0.98));
}

.bear-count {
  margin: 12px 0 10px;
  font-size: 2rem;
  font-weight: 800;
}

.tips-list {
  display: grid;
  gap: 12px;
  margin: 12px 0 0;
  padding-left: 18px;
}

.tips-list li {
  line-height: 1.5;
}

.status-line {
  min-height: 24px;
  margin: 0;
}

.empty-state {
  padding: 20px;
  text-align: center;
  border: 1px dashed var(--stroke);
  border-radius: 16px;
}

.session-bears {
  font-size: 1.1rem;
}

@media (max-width: 1220px) {
  .content-grid,
  .study-layout,
  .split-section,
  .dashboard-grid,
  .study-meta {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .topbar,
  .hero,
  .table-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .word-row {
    grid-template-columns: 1fr;
  }
}