/* ═══════════════════════════════════════════════════════════════
   生活情境日语图解大百科 · 学习平台 · 主样式
   ═══════════════════════════════════════════════════════════════ */

/* ── CSS 变量 ── */
:root {
  --red:       #e63946;
  --red-light: #fde8ea;
  --red-dark:  #c1121f;
  --white:     #ffffff;
  --bg:        #f8f9fa;
  --bg2:       #f0f2f5;
  --border:    #e0e4ea;
  --text:      #1a1a2e;
  --text2:     #555e6e;
  --text3:     #8a94a6;
  --shadow:    0 2px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.14);
  --radius:    12px;
  --radius-sm: 8px;
  --transition: .2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC",
               "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
button { cursor: pointer; border: none; background: none; font: inherit; }
input  { font: inherit; }
a      { color: inherit; text-decoration: none; }

/* ── 顶部导航 ── */
.site-header {
  background: linear-gradient(135deg, var(--red-dark) 0%, var(--red) 100%);
  color: var(--white);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 16px rgba(198,18,31,.3);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: .75rem;
}
.logo-icon { font-size: 2rem; line-height: 1; }
.logo h1   { font-size: 1.15rem; font-weight: 700; letter-spacing: .02em; }
.logo p    { font-size: .75rem; opacity: .8; margin-top: 1px; }

.header-right {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-shrink: 0;
}
.header-stats { display: flex; gap: .5rem; flex-wrap: wrap; }
.stat-badge {
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 20px;
  padding: .2rem .75rem;
  font-size: .78rem;
  white-space: nowrap;
}

/* ── 工具栏 ── */
.toolbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: .75rem 1.5rem;
  position: sticky;
  top: 64px;
  z-index: 90;
}
.toolbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

/* 搜索框 */
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.search-icon {
  position: absolute;
  left: .85rem;
  font-size: 1rem;
  pointer-events: none;
}
#searchInput {
  width: 100%;
  padding: .6rem 2.5rem .6rem 2.5rem;
  border: 1.5px solid var(--border);
  border-radius: 24px;
  font-size: .95rem;
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
#searchInput:focus {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(230,57,70,.12);
  background: var(--white);
}
.clear-btn {
  position: absolute;
  right: .75rem;
  color: var(--text3);
  font-size: .85rem;
  padding: .2rem .4rem;
  border-radius: 50%;
  transition: background var(--transition);
}
.clear-btn:hover { background: var(--bg2); color: var(--text); }

/* 分类筛选 */
.filter-wrap {
  display: flex;
  gap: .4rem;
  flex-wrap: wrap;
}
.filter-btn {
  padding: .3rem .85rem;
  border-radius: 20px;
  font-size: .82rem;
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--text2);
  transition: all var(--transition);
  white-space: nowrap;
}
.filter-btn:hover {
  border-color: var(--red);
  color: var(--red);
}
.filter-btn.active {
  background: var(--red);
  border-color: var(--red);
  color: var(--white);
  font-weight: 600;
}

/* ── 主内容 ── */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
}

.result-bar {
  font-size: .85rem;
  color: var(--text3);
  margin-bottom: .75rem;
  min-height: 1.4em;
}

/* ── 卡片网格 ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

/* ── 课程卡片 ── */
.track-card {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: .5rem;
  position: relative;
  overflow: hidden;
}
.track-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.track-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--red);
}
.track-card:hover::before { transform: scaleX(1); }

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .5rem;
}
.track-num {
  font-size: .72rem;
  font-weight: 700;
  color: var(--red);
  background: var(--red-light);
  padding: .15rem .5rem;
  border-radius: 6px;
  white-space: nowrap;
  flex-shrink: 0;
}
.cat-tag {
  font-size: .7rem;
  color: var(--text3);
  background: var(--bg2);
  padding: .15rem .5rem;
  border-radius: 6px;
  white-space: nowrap;
}

.card-title {
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.card-title .ja { font-size: .88rem; color: var(--text2); font-weight: 400; }

.card-preview {
  font-size: .82rem;
  color: var(--text3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-top: 1px solid var(--bg2);
  padding-top: .4rem;
  margin-top: .1rem;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: .2rem;
}
.duration-badge {
  font-size: .75rem;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: .25rem;
}
.play-hint {
  font-size: .75rem;
  color: var(--red);
  opacity: 0;
  transition: opacity var(--transition);
}
.track-card:hover .play-hint { opacity: 1; }

/* ── 加载 & 空状态 ── */
.loading-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text3);
}
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--red);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto 1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text3);
}
.empty-icon { font-size: 3rem; margin-bottom: .75rem; }
.empty-state button {
  margin-top: 1rem;
  padding: .5rem 1.5rem;
  background: var(--red);
  color: var(--white);
  border-radius: 20px;
  font-size: .9rem;
  transition: background var(--transition);
}
.empty-state button:hover { background: var(--red-dark); }

/* ── 弹窗 ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  backdrop-filter: blur(4px);
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  background: var(--white);
  border-radius: var(--radius);
  width: 100%;
  max-width: 760px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp .25s ease;
  box-shadow: var(--shadow-lg);
}
@keyframes slideUp {
  from { transform: translateY(24px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.modal-close {
  position: sticky;
  top: .75rem;
  float: right;
  margin: .75rem .75rem 0 0;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--bg2);
  color: var(--text2);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  z-index: 10;
}
.modal-close:hover { background: var(--border); }

.modal-body { padding: 1.5rem; }

/* 弹窗内容 */
.modal-track-num {
  font-size: .8rem;
  color: var(--red);
  font-weight: 700;
  margin-bottom: .25rem;
}
.modal-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: .25rem;
}
.modal-title .ja {
  font-size: 1rem;
  color: var(--text2);
  font-weight: 400;
  margin-left: .5rem;
}
.modal-cat {
  font-size: .8rem;
  color: var(--text3);
  margin-bottom: 1rem;
}

/* 音频播放器 */
.audio-player {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: .75rem 1rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}
.audio-player audio {
  flex: 1;
  min-width: 200px;
  height: 36px;
  accent-color: var(--red);
}
.audio-note {
  font-size: .75rem;
  color: var(--text3);
  width: 100%;
}

/* Tab 切换 */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1rem;
}
.tab-btn {
  padding: .5rem 1.1rem;
  font-size: .88rem;
  color: var(--text3);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--red);
  border-bottom-color: var(--red);
  font-weight: 600;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* 三栏对照表 */
.table-wrap { overflow-x: auto; }
.sanlan-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
}
.sanlan-table th {
  background: var(--bg2);
  padding: .5rem .75rem;
  text-align: left;
  font-weight: 600;
  font-size: .8rem;
  color: var(--text2);
  white-space: nowrap;
}
.sanlan-table td {
  padding: .55rem .75rem;
  border-bottom: 1px solid var(--bg2);
  vertical-align: top;
}
.sanlan-table tr:last-child td { border-bottom: none; }
.sanlan-table tr:hover td { background: var(--red-light); }
.td-ja   { font-size: .95rem; line-height: 1.5; }
.td-roma { color: var(--text3); font-size: .82rem; font-style: italic; }
.td-zh   { color: var(--text2); }

/* 词汇表 */
.vocab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
.vocab-table th {
  background: var(--bg2);
  padding: .45rem .65rem;
  text-align: left;
  font-size: .78rem;
  color: var(--text2);
  font-weight: 600;
}
.vocab-table td {
  padding: .45rem .65rem;
  border-bottom: 1px solid var(--bg2);
}
.vocab-table tr:last-child td { border-bottom: none; }
.vocab-word { font-weight: 600; color: var(--text); }
.vocab-pos  {
  font-size: .75rem;
  background: var(--bg2);
  padding: .1rem .4rem;
  border-radius: 4px;
  color: var(--text3);
}

/* 文化注释 */
.culture-box {
  background: linear-gradient(135deg, #fff9f9 0%, #fff 100%);
  border-left: 3px solid var(--red);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.1rem;
  font-size: .88rem;
  color: var(--text2);
  line-height: 1.7;
}
.culture-box p {
  margin: 0;
}
.culture-box p + p {
  margin-top: .8rem;
}

/* 对话 */
.dialog-list { display: flex; flex-direction: column; gap: .6rem; }
.dialog-item {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
}
.dialog-speaker {
  font-size: .75rem;
  font-weight: 700;
  color: var(--red);
  background: var(--red-light);
  padding: .15rem .5rem;
  border-radius: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: .1rem;
}
.dialog-text { font-size: .9rem; line-height: 1.5; }

/* ── 回到顶部 ── */
.back-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  width: 40px; height: 40px;
  background: var(--red);
  color: var(--white);
  border-radius: 50%;
  font-size: 1.1rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-top:hover { background: var(--red-dark); transform: translateY(-2px); }

/* ── 页脚 ── */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: .8rem;
  color: var(--text3);
  border-top: 1px solid var(--border);
  background: var(--white);
}

/* ── 工具类 ── */
.hidden { display: none !important; }

/* ── 响应式 ── */
@media (max-width: 768px) {
  .header-inner { height: 58px; padding: 0 1rem; }
  .logo h1 { font-size: 1.05rem; }
  .logo p  { display: none; }
  .toolbar { padding: .6rem 1rem; top: 58px; }
  .toolbar-inner { gap: .5rem; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .filter-btn { padding: .3rem .7rem; font-size: .78rem; }
  .modal-body { padding: 1.1rem; }
  .modal-title { font-size: 1.25rem; }
  .tab-btn { padding: .45rem .85rem; font-size: .85rem; }
  .sanlan-table th, .sanlan-table td { padding: .45rem .6rem; }
}

@media (max-width: 640px) {
  .header-inner { height: 56px; }
  .logo h1 { font-size: 1rem; }
  .logo-icon { font-size: 1.6rem; }
  .card-grid { grid-template-columns: 1fr; }
  .main-content { padding: 1rem 1rem 3rem; }
  .modal-body { padding: 1rem; }
  .modal-title { font-size: 1.15rem; }
  .modal-title .ja { font-size: .9rem; }
  .tab-btn { padding: .4rem .7rem; font-size: .82rem; }
  .audio-player { padding: .6rem .8rem; }
  .audio-player audio { min-width: 160px; }
  .sanlan-table th, .sanlan-table td { padding: .4rem .5rem; }
  .vocab-table th, .vocab-table td { padding: .4rem .5rem; }
  .culture-box { padding: .85rem .9rem; }
  .dialog-item { flex-direction: column; gap: .3rem; }
  .dialog-speaker { display: inline-block; margin-top: 0; }
}

@media (max-width: 480px) {
  .header-stats { display: none; }
  .header-inner { padding: 0 .75rem; }
  .toolbar { padding: .5rem .75rem; }
  .main-content { padding: .85rem .75rem 2.5rem; }
  .track-card { padding: .9rem; }
  .card-title { font-size: .9rem; }
  .card-preview { font-size: .78rem; }
  .modal-body { padding: .85rem; }
  .modal-title { font-size: 1.05rem; }
  .modal-title .ja { font-size: .85rem; display: block; margin-top: .2rem; margin-left: 0; }
  .modal-cat { font-size: .75rem; margin-bottom: .85rem; }
  .tab-btn { padding: .4rem .6rem; font-size: .78rem; }
  .sanlan-table, .vocab-table { font-size: .8rem; }
  .td-ja { font-size: .88rem; }
  .td-roma { font-size: .78rem; }
  .vocab-table th, .vocab-table td { padding: .35rem .4rem; }
  .vocab-word { font-size: .85rem; }
  .vocab-pos { font-size: .7rem; padding: .08rem .35rem; }
  .culture-box { padding: .75rem; font-size: .84rem; }
  .dialog-text { font-size: .86rem; }
  .back-top { bottom: 1.5rem; right: 1rem; width: 36px; height: 36px; font-size: 1rem; }
  .site-footer { padding: 1.2rem .75rem; font-size: .76rem; }
}

/* ── 搜索高亮 ── */
mark {
  background: #ffe066;
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
}