/* ============================================================
   중국어 온라인 교재 — style.css
   디자인 방향: Apple Books + 현대적 학습 플랫폼
   ============================================================ */

/* -------------------- 폰트 -------------------- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Noto+Sans+KR:wght@400;500;600;700&display=swap');

/* -------------------- 디자인 토큰 -------------------- */
:root {
  /* 라이트 테마 (기본) */
  --color-bg: #FAF9F7;
  --color-bg-elevated: #FFFFFF;
  --color-surface: #FFFFFF;
  --color-border: #EAE7E1;
  --color-border-strong: #DCD8D0;

  --color-text: #2B2926;
  --color-text-secondary: #6B6660;
  --color-text-tertiary: #9C9690;

  --color-accent: #2F5FD1;
  --color-accent-strong: #2449A8;
  --color-accent-soft: #E8EDFC;
  --color-accent-soft-border: #C2D0F5;

  --color-success: #2F7D4F;
  --color-success-soft: #E4F2E8;
  --color-error: #B0392E;
  --color-error-soft: #FBEAE8;

  --font-zh: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', serif;
  --font-kr: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-s: 6px;
  --radius-m: 10px;
  --radius-l: 16px;

  --shadow-card: 0 1px 2px rgba(43, 41, 38, 0.04), 0 1px 8px rgba(43, 41, 38, 0.04);

  --sidebar-w: 240px;
  --panel-w: 280px;
  --header-h: 60px;

  --transition-fast: 140ms ease;
}

/* 다크 테마 */
:root[data-theme="dark"] {
  --color-bg: #1C1B19;
  --color-bg-elevated: #242220;
  --color-surface: #242220;
  --color-border: #38352F;
  --color-border-strong: #454138;

  --color-text: #EDEAE4;
  --color-text-secondary: #ABA59C;
  --color-text-tertiary: #7A756C;

  --color-accent: #5C8DF0;
  --color-accent-strong: #7BA2F5;
  --color-accent-soft: #1E2A4D;
  --color-accent-soft-border: #30407A;

  --color-success: #5FBE84;
  --color-success-soft: #1E3327;
  --color-error: #E27167;
  --color-error-soft: #3A2624;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.2), 0 2px 12px rgba(0, 0, 0, 0.24);
}

/* -------------------- 리셋 & 베이스 -------------------- */
* { box-sizing: border-box; }

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

body {
  font-family: var(--font-kr);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input {
  font-family: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.zh { font-family: var(--font-zh); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* -------------------- 앱 레이아웃 -------------------- */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== 상단 헤더 ===== */
.app-header {
  height: var(--header-h);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hamburger-btn {
  display: none;
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-s);
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.hamburger-btn:hover { background: var(--color-bg); }

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-s);
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-name {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn {
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-s);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.icon-btn:hover {
  background: var(--color-bg);
  color: var(--color-text);
}
.icon-btn svg { width: 19px; height: 19px; }

.header-search {
  position: relative;
  display: flex;
  align-items: center;
}
.header-search input {
  width: 220px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 18px;
  background: var(--color-bg);
  padding: 0 14px 0 36px;
  font-size: 13.5px;
  color: var(--color-text);
}
.header-search input:focus {
  border-color: var(--color-accent);
  outline: none;
}
.header-search svg {
  position: absolute;
  left: 12px;
  width: 15px;
  height: 15px;
  color: var(--color-text-tertiary);
  pointer-events: none;
}

/* ===== 메인 3단 레이아웃 ===== */
.app-body {
  flex: 1;
  display: flex;
  min-height: 0;
}

/* ---- 사이드바 ---- */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--color-bg-elevated);
  border-right: 1px solid var(--color-border);
  padding: 18px 12px;
  overflow-y: auto;
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 20px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-s);
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  width: 100%;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-item svg { width: 17px; height: 17px; flex-shrink: 0; }
.nav-item:hover {
  background: var(--color-bg);
  color: var(--color-text);
}
.nav-item.active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.sidebar-divider {
  height: 1px;
  background: var(--color-border);
  margin: 4px 12px 14px;
}

.sidebar-label {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  padding: 0 12px;
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.lesson-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 12px;
  border-radius: var(--radius-s);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.lesson-nav-item:hover { background: var(--color-bg); color: var(--color-text); }
.lesson-nav-item.active {
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}
.lesson-nav-item .ln-title {
  font-size: 13.5px;
  font-weight: 600;
  font-family: var(--font-zh);
}
.lesson-nav-item .ln-progress {
  font-size: 11px;
  color: var(--color-text-tertiary);
  font-weight: 600;
  flex-shrink: 0;
}
.lesson-nav-item.active .ln-progress { color: var(--color-accent); }

.sidebar-group { margin-bottom: 14px; }
.sidebar-group:last-child { margin-bottom: 0; }
.sidebar-group-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  padding: 0 12px;
  margin: 0 0 6px;
  letter-spacing: 0.01em;
}
.sidebar-group-readonly {
  display: inline-flex;
  color: var(--color-text-tertiary);
}
.sidebar-group-readonly svg { width: 11px; height: 11px; }

.sidebar-empty-hint {
  font-size: 12.5px;
  color: var(--color-text-tertiary);
  padding: 4px 12px;
  line-height: 1.5;
}

/* ---- 메인 콘텐츠 ---- */
.main-content {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
  padding: 28px 32px 60px;
}

.content-inner {
  max-width: 760px;
  margin: 0 auto;
}

/* ---- 오른쪽 정보 패널 ---- */
.info-panel {
  width: var(--panel-w);
  flex-shrink: 0;
  border-left: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  padding: 20px 18px;
  overflow-y: auto;
}

.panel-section {
  margin-bottom: 24px;
}

.panel-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-tertiary);
  margin: 0 0 10px;
  letter-spacing: 0.01em;
}

.panel-lesson-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: 14px;
}

.panel-lesson-card .pl-title {
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 15px;
  margin: 0 0 2px;
}
.panel-lesson-card .pl-sub {
  font-size: 12.5px;
  color: var(--color-text-secondary);
  margin: 0 0 12px;
}

.panel-action-btn {
  width: 100%;
  justify-content: center;
  margin-top: 12px;
  font-size: 12.5px;
  padding: 8px 12px;
}
.panel-section .panel-action-btn { margin-top: 10px; }
.panel-action-btn svg { width: 14px; height: 14px; }

.panel-progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--color-text-secondary);
  padding: 6px 0;
  border-top: 1px solid var(--color-border);
}
.panel-progress-row:first-of-type { border-top: none; }
.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 600;
}
.status-dot.done { color: var(--color-success); }
.status-dot.progress { color: var(--color-accent); }
.status-dot.todo { color: var(--color-text-tertiary); }
.status-dot::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.lesson-menu-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.lesson-menu-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--radius-s);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  color: var(--color-text-secondary);
  font-size: 13px;
  font-weight: 500;
}
.lesson-menu-item:hover { background: var(--color-bg); }
.lesson-menu-item.active {
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

/* -------------------- 진행률 바 -------------------- */
.progress-bar-track {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-border);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: var(--color-accent);
  transition: width 320ms ease;
}
.progress-text-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* ==================================================
   홈 화면
   ================================================== */
.home-hero {
  margin-bottom: 28px;
}
.home-hero h1 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}
.home-hero p {
  font-size: 14.5px;
  color: var(--color-text-secondary);
  margin: 0;
}

.continue-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 22px 24px;
  margin-bottom: 32px;
}
.continue-card .cc-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0 0 10px;
}
.continue-card .cc-title {
  font-family: var(--font-zh);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 2px;
}
.continue-card .cc-sub {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0 0 16px;
}
.continue-card .cc-progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.continue-card .cc-percent {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-secondary);
  flex-shrink: 0;
  width: 38px;
  text-align: right;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-s);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  transition: background var(--transition-fast);
}
.btn-primary:hover { background: var(--color-accent-strong); }
.btn-primary svg { width: 15px; height: 15px; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  padding: 9px 16px;
  font-size: 13.5px;
  font-weight: 600;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.btn-secondary:hover { background: var(--color-bg); }
.btn-secondary svg { width: 15px; height: 15px; }

.section-heading {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 14px;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 30px;
}

.lesson-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: 16px;
  text-align: left;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.lesson-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}
.lesson-card .lc-num {
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 16px;
  margin: 0 0 4px;
}
.lesson-card .lc-title {
  font-family: var(--font-zh);
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0 0 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lesson-card .lc-progress-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.lesson-card .lc-percent {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

/* ==================================================
   교재 화면 (Reader)
   ================================================== */
.reader-header {
  margin-bottom: 4px;
}
.reader-header .rh-label {
  font-family: var(--font-zh);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0 0 4px;
}
.reader-header h2 {
  font-family: var(--font-zh);
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}
.reader-header .rh-korean {
  font-size: 14.5px;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
}

.tab-row {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 22px;
  overflow-x: auto;
}
.tab-btn {
  background: none;
  border: none;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition-fast);
}
.tab-btn:hover { color: var(--color-text); }
.tab-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- 본문 탭 ---- */
.reader-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.toggle-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: 18px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.toggle-chip svg { width: 14px; height: 14px; }
.toggle-chip:hover { border-color: var(--color-accent); }
.toggle-chip.active {
  background: var(--color-accent-soft);
  border-color: var(--color-accent-soft-border);
  color: var(--color-accent-strong);
}

.passage {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sentence-block {
  border-radius: var(--radius-m);
  padding: 12px 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.sentence-block:hover {
  background: var(--color-surface);
  border-color: var(--color-border);
}
.sentence-block.selected {
  background: var(--color-accent-soft);
  border-color: var(--color-accent-soft-border);
}
.sentence-block.bookmarked .sb-chinese::after {
  content: '★';
  color: var(--color-accent);
  font-size: 13px;
  margin-left: 8px;
  vertical-align: middle;
}

.sb-chinese {
  font-family: var(--font-zh);
  font-size: 22px;
  line-height: 1.9;
  color: var(--color-text);
}
.sb-pinyin {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 4px;
  display: none;
}
.sb-pinyin.show { display: block; }
.sb-translation {
  font-size: 14.5px;
  color: var(--color-text-secondary);
  margin-top: 4px;
  display: none;
  padding-top: 4px;
  border-top: 1px dashed var(--color-border);
}
.sb-translation.show { display: block; }

/* 문장 상세 패널 */
.sentence-detail {
  margin-top: 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: 18px 20px;
  display: none;
}
.sentence-detail.show { display: block; }
.sentence-detail .sd-zh {
  font-family: var(--font-zh);
  font-size: 21px;
  margin: 0 0 8px;
}
.sentence-detail .sd-pinyin {
  font-size: 14.5px;
  color: var(--color-text-secondary);
  margin: 0 0 6px;
}
.sentence-detail .sd-kr {
  font-size: 15px;
  color: var(--color-text);
  margin: 0 0 16px;
}
.sd-actions { display: flex; gap: 8px; }
.action-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  transition: all var(--transition-fast);
}
.action-chip svg { width: 14px; height: 14px; }
.action-chip:hover { border-color: var(--color-accent); }
.action-chip.saved {
  background: var(--color-accent-soft);
  border-color: var(--color-accent-soft-border);
  color: var(--color-accent-strong);
}

/* ---- 단어 탭 ---- */
.vocab-search {
  position: relative;
  margin-bottom: 18px;
}
.vocab-search input {
  width: 100%;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-s);
  background: var(--color-surface);
  padding: 0 14px 0 38px;
  font-size: 14px;
  color: var(--color-text);
}
.vocab-search input:focus { border-color: var(--color-accent); outline: none; }
.vocab-search svg {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
}

.vocab-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  overflow: hidden;
}
.vocab-table th {
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-tertiary);
  padding: 10px 14px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}
.vocab-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}
.vocab-table tr:last-child td { border-bottom: none; }
.vocab-table tbody tr {
  cursor: pointer;
  transition: background var(--transition-fast);
}
.vocab-table tbody tr:hover { background: var(--color-bg); }
.vocab-table .vt-word {
  font-family: var(--font-zh);
  font-size: 17px;
  font-weight: 600;
}
.vocab-table .vt-pos {
  color: var(--color-text-tertiary);
  font-size: 13px;
}

.vocab-cards {
  display: none;
  flex-direction: column;
  gap: 8px;
}
.vocab-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.vocab-card .vc-left { min-width: 0; }
.vocab-card .vc-word {
  font-family: var(--font-zh);
  font-size: 19px;
  font-weight: 600;
}
.vocab-card .vc-pinyin {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}
.vocab-card .vc-meaning {
  font-size: 13.5px;
  color: var(--color-text);
  text-align: right;
  flex-shrink: 0;
}
.vocab-card .vc-pos {
  display: block;
  font-size: 11px;
  color: var(--color-text-tertiary);
  margin-top: 2px;
}

.vocab-empty {
  padding: 30px 0;
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 14px;
}

/* 단어 상세 모달(패널) */
.word-detail {
  margin-top: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 20px 22px;
  display: none;
}
.word-detail.show { display: block; }
.word-detail .wd-word {
  font-family: var(--font-zh);
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 2px;
}
.word-detail .wd-pinyin {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0 0 10px;
}
.word-detail .wd-pos {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-radius: 10px;
  padding: 3px 10px;
  margin-bottom: 12px;
}
.word-detail .wd-meaning {
  font-size: 16px;
  margin: 0 0 16px;
}
.word-detail .wd-actions { display: flex; gap: 8px; margin-bottom: 16px; }
.word-detail .wd-example-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-tertiary);
  margin: 0 0 8px;
}
.word-detail .wd-example {
  font-family: var(--font-zh);
  font-size: 16px;
  color: var(--color-text-secondary);
  padding: 12px 14px;
  background: var(--color-bg);
  border-radius: var(--radius-s);
}

/* ---- 문법 탭 ---- */
.grammar-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.grammar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 20px 22px;
}
.grammar-card .gc-number {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0 0 6px;
}
.grammar-card .gc-title {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
}
.grammar-card .gc-desc {
  font-size: 14.5px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0 0 14px;
}
.grammar-card .gc-example-box {
  background: var(--color-bg);
  border-radius: var(--radius-s);
  padding: 14px 16px;
}
.grammar-card .gc-example-zh {
  font-family: var(--font-zh);
  font-size: 17px;
  margin: 0 0 4px;
}
.grammar-card .gc-example-kr {
  font-size: 13.5px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ---- 연습문제 탭 ---- */
.quiz-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.quiz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 20px 22px;
}
.quiz-card .qc-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-tertiary);
  margin: 0 0 8px;
}
.quiz-card .qc-question {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 14px;
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}
.quiz-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
  font-size: 14px;
  color: var(--color-text);
  text-align: left;
  transition: all var(--transition-fast);
}
.quiz-option:hover { border-color: var(--color-accent); }
.quiz-option.selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}
.quiz-option .qo-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--color-border-strong);
  flex-shrink: 0;
}
.quiz-option.selected .qo-dot {
  border-color: var(--color-accent);
  background: var(--color-accent);
  box-shadow: inset 0 0 0 3px var(--color-accent-soft);
}
.quiz-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-soft);
}
.quiz-option.correct .qo-dot { border-color: var(--color-success); background: var(--color-success); }
.quiz-option.wrong {
  border-color: var(--color-error);
  background: var(--color-error-soft);
}
.quiz-option.wrong .qo-dot { border-color: var(--color-error); background: var(--color-error); }
.quiz-option.disabled { pointer-events: none; }

.quiz-check-btn {
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-s);
  padding: 10px 18px;
  font-size: 13.5px;
  font-weight: 600;
}
.quiz-check-btn:disabled {
  background: var(--color-border-strong);
  color: var(--color-text-tertiary);
  cursor: not-allowed;
}

.quiz-result {
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  display: none;
  padding: 10px 14px;
  border-radius: var(--radius-s);
}
.quiz-result.show { display: block; }
.quiz-result.correct {
  color: var(--color-success);
  background: var(--color-success-soft);
}
.quiz-result.wrong {
  color: var(--color-error);
  background: var(--color-error-soft);
}
.quiz-result .qr-hint {
  display: block;
  font-weight: 400;
  margin-top: 3px;
  color: var(--color-text-secondary);
}

/* ==================================================
   단어장 / 북마크 페이지 (전역)
   ================================================== */
.page-header {
  margin-bottom: 24px;
}
.page-header h1 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 4px;
}
.page-header p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.filter-chip-row {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-tertiary);
}
.empty-state svg {
  width: 40px;
  height: 40px;
  margin-bottom: 12px;
  opacity: 0.5;
}
.empty-state p { font-size: 14.5px; margin: 0; }

/* -------------------- 검색 결과 오버레이 -------------------- */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 18, 16, 0.4);
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 20px 20px;
}
.search-overlay.show { display: flex; }
.search-overlay-panel {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-l);
  width: 100%;
  max-width: 560px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.2);
}
.search-overlay-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
}
.search-overlay-input-row svg { width: 18px; height: 18px; color: var(--color-text-tertiary); flex-shrink: 0; }
.search-overlay-input-row input {
  flex: 1;
  border: none;
  background: none;
  font-size: 16px;
  color: var(--color-text);
}
.search-overlay-input-row input:focus { outline: none; }
.search-overlay-close {
  background: var(--color-bg);
  border: none;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 4px 8px;
}
.search-overlay-results {
  overflow-y: auto;
  padding: 8px;
}
.search-result-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 12px;
  border-radius: var(--radius-s);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
}
.search-result-item:hover { background: var(--color-bg); }
.search-result-item .sr-word {
  font-family: var(--font-zh);
  font-size: 16px;
  font-weight: 600;
}
.search-result-item .sr-pinyin {
  font-size: 12.5px;
  color: var(--color-text-tertiary);
  margin-left: 6px;
  font-family: var(--font-kr);
}
.search-result-item .sr-meaning {
  font-size: 13px;
  color: var(--color-text-secondary);
}
.search-result-item .sr-lesson {
  font-size: 11.5px;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}
.search-overlay-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 14px;
}

/* -------------------- 사이드바 오버레이 (모바일) -------------------- */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 18, 16, 0.4);
  z-index: 45;
  display: none;
}
.sidebar-backdrop.show { display: block; }

/* -------------------- Toast -------------------- */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--color-text);
  color: var(--color-bg);
  padding: 10px 18px;
  border-radius: 20px;
  font-size: 13.5px;
  font-weight: 500;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* -------------------- 하단 탭 네비 (모바일 전용) -------------------- */
.mobile-tab-nav {
  display: none;
  position: sticky;
  bottom: 0;
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  z-index: 30;
}

/* ============================================================
   반응형: 태블릿 (오른쪽 패널 제거)
   ============================================================ */
@media (max-width: 1080px) {
  .info-panel { display: none; }
}

/* ============================================================
   반응형: 모바일 (사이드바 → 햄버거)
   ============================================================ */
@media (max-width: 760px) {
  .hamburger-btn { display: flex; }

  .header-search input { width: 150px; }

  .sidebar {
    position: fixed;
    top: var(--header-h);
    bottom: 0;
    left: 0;
    z-index: 46;
    width: 250px;
    transform: translateX(-100%);
    transition: transform 220ms ease;
    box-shadow: 4px 0 24px rgba(0,0,0,0.08);
  }
  .sidebar.open { transform: translateX(0); }

  .main-content {
    padding: 18px 16px 90px;
  }

  .lesson-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sb-chinese { font-size: 20px; line-height: 1.85; }

  .reader-header h2 { font-size: 22px; }

  .vocab-table { display: none; }
  .vocab-cards { display: flex; }

  .tab-row {
    position: sticky;
    top: 0;
    background: var(--color-bg);
    z-index: 5;
  }
}

@media (max-width: 420px) {
  .header-search { display: none; }
  .continue-card { padding: 18px; }
  .lesson-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
}

/* ============================================================
   교재 관리(Admin) 화면
   ============================================================ */

.admin-toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.admin-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: start;
}

.admin-lesson-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 16px;
  position: sticky;
  top: 16px;
}

.admin-lesson-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 14px;
}

.admin-lesson-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 9px 10px;
  border-radius: var(--radius-s);
  background: none;
  border: none;
  text-align: left;
  width: 100%;
  transition: background var(--transition-fast);
}
.admin-lesson-item:hover { background: var(--color-bg); }
.admin-lesson-item.active {
  background: var(--color-accent-soft);
}
.admin-lesson-item .ali-title {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--color-accent);
}
.admin-lesson-item .ali-sub {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.admin-add-lesson-btn {
  width: 100%;
  justify-content: center;
}

.admin-detail-panel {
  min-width: 0;
}

.admin-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  padding: 20px 22px;
  margin-bottom: 18px;
}

.admin-lesson-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.admin-lesson-header-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.admin-field {
  margin-bottom: 14px;
}
.admin-field label {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}
.admin-field input[type="text"],
.admin-field textarea {
  width: 100%;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 9px 12px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
}
.admin-field select {
  width: 100%;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 9px 12px;
  font-size: 14px;
  font-family: inherit;
}
.admin-field input[type="text"]:focus,
.admin-field textarea:focus,
.admin-field select:focus {
  outline: none;
  border-color: var(--color-accent);
}
.admin-field input:disabled,
.admin-field select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.admin-field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.admin-form-actions {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.admin-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.admin-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: 14px 16px;
}
.admin-row-main { min-width: 0; flex: 1; }
.admin-row-zh {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 4px;
}
.admin-row-sub {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}
.admin-row-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.icon-text-btn {
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-text-secondary);
  white-space: nowrap;
}
.icon-text-btn:hover { background: var(--color-bg); color: var(--color-text); }
.icon-text-btn.danger { color: var(--color-error); border-color: var(--color-error-soft); }
.icon-text-btn.danger:hover { background: var(--color-error-soft); }

.admin-add-btn {
  margin-bottom: 6px;
}

.admin-add-btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}
.admin-add-btn-row .admin-add-btn { margin-bottom: 0; }

.admin-empty-row {
  text-align: center;
  padding: 30px 0;
  color: var(--color-text-tertiary);
  font-size: 13.5px;
  background: var(--color-surface);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-m);
}

.admin-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.admin-quiz-option-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.admin-quiz-option-row input[type="radio"] {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
}
.admin-quiz-option-row .qf-opt-input { flex: 1; }

@media (max-width: 760px) {
  .admin-layout {
    grid-template-columns: 1fr;
  }
  .admin-lesson-panel {
    position: static;
  }
  .admin-field-row {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   학습 화면 인라인 편집 모드
   ============================================================ */

#edit-mode-toggle-btn.active {
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
}

/* 편집 모드가 꺼져 있을 때는 인라인 편집 컨트롤을 숨김 */
.inline-edit-controls { display: none; }
body.edit-mode-on .inline-edit-controls { display: flex; }

.inline-edit-banner {
  display: none;
  align-items: center;
  gap: 8px;
  background: var(--color-accent-soft);
  border: 1px solid var(--color-accent-soft-border);
  color: var(--color-accent-strong);
  border-radius: var(--radius-m);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
}
body.edit-mode-on .inline-edit-banner { display: flex; }
.inline-edit-banner svg { width: 15px; height: 15px; flex-shrink: 0; }
.inline-edit-banner.readonly {
  display: flex;
  background: var(--color-bg);
  border-color: var(--color-border-strong);
  color: var(--color-text-secondary);
}

.sentence-block {
  position: relative;
}
.sentence-block .inline-edit-controls {
  position: absolute;
  top: 8px;
  right: 8px;
  gap: 4px;
}
.inline-edit-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}
.inline-edit-btn:hover { background: var(--color-bg); color: var(--color-text); }
.inline-edit-btn.danger:hover { color: var(--color-error); border-color: var(--color-error-soft); background: var(--color-error-soft); }
.inline-edit-btn svg { width: 14px; height: 14px; }

.inline-add-btn {
  display: none;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
}
body.edit-mode-on .inline-add-btn { display: inline-flex; }
.inline-add-btn svg { width: 15px; height: 15px; }

.vocab-card, .vocab-table tbody tr {
  position: relative;
}
.vocab-card .inline-edit-controls {
  flex-shrink: 0;
  gap: 4px;
  margin-left: 8px;
}
.vt-row-edit-cell {
  width: 1%;
  white-space: nowrap;
}

.grammar-card, .quiz-card {
  position: relative;
}
.grammar-card .inline-edit-controls,
.quiz-card .inline-edit-controls {
  position: absolute;
  top: 16px;
  right: 16px;
  gap: 4px;
}

@media (max-width: 760px) {
  .sentence-block .inline-edit-controls,
  .grammar-card .inline-edit-controls,
  .quiz-card .inline-edit-controls {
    position: static;
    margin-top: 10px;
  }
}

/* ============================================================
   클래스 화면
   ============================================================ */

.inline-form-row {
  display: flex;
  gap: 8px;
}
.inline-form-row input {
  flex: 1;
  height: 40px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 0 12px;
  font-size: 14px;
}
.inline-form-row input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.join-code-input {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.join-code-badge {
  display: inline-block;
  font-family: monospace;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  border: 1px solid var(--color-accent-soft-border);
  border-radius: var(--radius-s);
  padding: 4px 10px;
  white-space: nowrap;
}

.class-card { margin-bottom: 12px; }

.class-roster {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}
.class-roster.show { display: block; }
.class-roster .admin-list { margin-bottom: 0; }

@media (max-width: 480px) {
  .admin-lesson-header-row { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   로그인 화면
   ============================================================ */

.login-screen {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  padding: 20px;
}
.login-screen.show { display: flex; }

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
  padding: 32px 28px;
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 8px;
}
.login-brand .brand-name {
  font-weight: 700;
  font-size: 15px;
}

.login-brand-sub {
  font-size: 12.5px;
  color: var(--color-text-secondary);
  margin: 0 0 22px;
}

.login-card h1 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 20px;
}

.login-field { margin-bottom: 14px; }
.login-field label {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}
.login-field input {
  width: 100%;
  height: 42px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
  color: var(--color-text);
  padding: 0 14px;
  font-size: 14.5px;
}
.login-field input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.login-error {
  min-height: 18px;
  color: var(--color-error);
  font-size: 13px;
  font-weight: 600;
  margin: 2px 0 12px;
}

.login-submit {
  width: 100%;
  justify-content: center;
  height: 44px;
  font-size: 14.5px;
}
.login-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ---- 헤더: 로그인 사용자 정보 ---- */
.header-user-info {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 0 4px;
  white-space: nowrap;
}
@media (max-width: 560px) {
  .header-user-info { display: none; }
}