/* ===== 主题变量 ===== */
:root {
  --bg: #f8f6f1;
  --surface: #ffffff;
  --surface2: #f2f0ea;
  --border: #e8e5de;
  --accent: #c4944a;
  --accent2: #6b5ce7;
  --accent3: #e05c5c;
  --accent4: #2eb8a6;
  --text: #2d2632;
  --text2: #6d5e78;
  --text3: #a89bab;
  --green: #2eb8a6;
  --red: #e05c5c;
  --shadow: 0 2px 12px rgba(45, 38, 50, 0.08);
  --shadow-lg: 0 8px 24px rgba(45, 38, 50, 0.12);
}

[data-theme="dark"] {
  --bg: #0d0b10;
  --surface: #1a1622;
  --surface2: #221e2c;
  --border: #332d40;
  --accent: #d4a853;
  --accent2: #8b7cf7;
  --accent3: #f06b6b;
  --accent4: #38d4b8;
  --text: #f0e8f5;
  --text2: #a89bb8;
  --text3: #6d5e78;
  --green: #38d4b8;
  --red: #f06b6b;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #e8e5de;
  color: var(--text);
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  transition: background 0.4s;
}

[data-theme="dark"] body,
body {
  background: #1a1622;
}

#app {
  width: 100%;
  max-width: 390px;
  min-height: 100vh;
  background: var(--bg);
  position: relative;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.2);
  transition: background 0.4s;
}

.serif {
  font-family: 'Noto Serif SC', 'Songti SC', serif;
}

.mono {
  font-family: 'JetBrains Mono', 'Menlo', monospace;
  letter-spacing: 0;
}

.brand-grad {
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ===== 页面管理 ===== */
.page {
  display: none;
  padding: 14px 20px 140px;
  min-height: 100vh;
}

.page.active {
  display: block;
}

/* ===== 通用容器 ===== */
.card, .card-lg {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.card-lg {
  border-radius: 22px;
  padding: 18px;
}

/* ===== 文本类 ===== */
.title {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}

.subtitle {
  font-size: 12px;
  color: var(--text2);
}

.muted {
  color: var(--text3);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  padding: 10px 16px;
  font-size: 14px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 16px rgba(107, 92, 231, 0.25);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text2);
  height: 44px;
  border-radius: 14px;
}

.btn-danger {
  color: var(--accent3);
  border-color: rgba(224, 92, 92, 0.3);
}

.btn-disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* ===== 标签 ===== */
.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 22px;
  background: var(--surface2);
  border: 1px solid var(--border);
  font-size: 11px;
  color: var(--text2);
  margin-right: 5px;
  font-weight: 500;
}

.tag-math      { color: #8b7cf7; border-color: rgba(107, 92, 231,  0.25); background: rgba(107, 92, 231,  0.08); }
.tag-physics   { color: #2eb8a6; border-color: rgba(46,  184, 166, 0.25); background: rgba(46,  184, 166, 0.08); }
.tag-chemistry { color: #38d4b8; border-color: rgba(56,  212, 184, 0.25); background: rgba(56,  212, 184, 0.08); }
.tag-biology   { color: #45c97a; border-color: rgba(69,  201, 122, 0.25); background: rgba(69,  201, 122, 0.08); }
.tag-chinese   { color: #e87545; border-color: rgba(232, 117,  69, 0.25); background: rgba(232, 117,  69, 0.08); }
.tag-english   { color: #4592e8; border-color: rgba(69,  146, 232, 0.25); background: rgba(69,  146, 232, 0.08); }
.tag-history   { color: #c4944a; border-color: rgba(196, 148,  74, 0.25); background: rgba(196, 148,  74, 0.08); }
.tag-geography { color: #7ac053; border-color: rgba(122, 192,  83, 0.25); background: rgba(122, 192,  83, 0.08); }
.tag-politics  { color: #b06fbb; border-color: rgba(176, 111, 187, 0.25); background: rgba(176, 111, 187, 0.08); }
.tag-other     { color: #9e8faa; border-color: rgba(158, 143, 170, 0.25); background: rgba(158, 143, 170, 0.08); }

/* ===== 难度点 ===== */
.dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.2s;
}

.dot.on {
  background: var(--accent);
}

/* ===== 底部导航 ===== */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 390px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-around;
  padding: 8px 0 max(8px, env(safe-area-inset-bottom));
  z-index: 100;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.04);
  transition: background 0.4s;
}

.tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  cursor: pointer;
  user-select: none;
  color: var(--text3);
  transition: color 0.2s;
  padding: 4px 12px;
}

.tab-item.active {
  color: var(--accent2);
}

.tab-icon {
  font-size: 20px;
}

.tab-label {
  font-size: 10px;
  font-weight: 500;
}

/* ===== 顶部 ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
}

.brand {
  display: flex;
  flex-direction: column;
}

.brand-text {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 1px;
}

.brand-sub {
  font-size: 10px;
  color: var(--text3);
  margin-top: 2px;
  letter-spacing: 0.5px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 16px;
}

.theme-toggle:hover {
  transform: rotate(20deg);
  background: var(--surface);
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.avatar-fallback {
  font-family: 'Noto Serif SC', serif;
  color: var(--accent);
  font-size: 16px;
  font-weight: 600;
}

/* ===== 统计卡片 ===== */
.stats {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 18px 0;
  display: flex;
  align-items: center;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: 28px;
  color: var(--text);
  font-weight: 700;
  line-height: 1.2;
}

.stat-num.accent2 { color: var(--accent2); }
.stat-num.green { color: var(--green); }

.stat-label {
  margin-top: 4px;
  font-size: 11px;
  color: var(--text2);
  font-weight: 500;
}

.stat-div {
  width: 1px;
  height: 32px;
  background: var(--border);
}

/* ===== 分区头部 ===== */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin: 18px 0 12px;
}

.section-title {
  display: block;
  font-size: 18px;
  font-weight: 600;
}

.section-sub {
  font-size: 10px;
  color: var(--text3);
  margin-top: 2px;
  letter-spacing: 0.5px;
}

.section-action {
  font-size: 12px;
  color: var(--accent2);
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 8px;
  font-weight: 500;
  transition: background 0.2s;
}

.section-action:hover {
  background: rgba(107, 92, 231, 0.08);
}

/* ===== 横滑卡片 ===== */
.hscroll {
  display: flex;
  overflow-x: auto;
  gap: 12px;
  padding: 4px 0 8px;
  margin: 0 -20px;
  padding-left: 20px;
  padding-right: 20px;
  scrollbar-width: none;
}

.hscroll::-webkit-scrollbar {
  display: none;
}

.due-card {
  flex-shrink: 0;
  width: 230px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow);
}

.due-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.due-bar {
  height: 4px;
  width: 100%;
}

.bar-math      { background: #7c6fff; }
.bar-physics   { background: #4ecdc4; }
.bar-chemistry { background: #52c985; }
.bar-biology   { background: #45c97a; }
.bar-chinese   { background: #e87545; }
.bar-english   { background: #4592e8; }
.bar-history   { background: #c4944a; }
.bar-geography { background: #7ac053; }
.bar-politics  { background: #b06fbb; }
.bar-other     { background: #9e8faa; }

.due-body {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.due-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.due-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--accent3);
  font-weight: 500;
}

.due-title {
  font-size: 15px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
  font-weight: 500;
}

.due-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.due-tag {
  font-size: 11px;
  color: var(--text3);
}

.due-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 40px 0;
  color: var(--text2);
  gap: 10px;
}

.due-empty .emoji {
  font-size: 36px;
}

/* ===== 最近列表 ===== */
.recent-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.recent-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow);
}

.recent-item:hover {
  transform: translateX(3px);
  box-shadow: var(--shadow-lg);
}

.recent-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Noto Serif SC', serif;
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  flex-shrink: 0;
}

.icon-math      { background: linear-gradient(135deg, #6b5ce7, #4f3bc7); }
.icon-physics   { background: linear-gradient(135deg, #2eb8a6, #1f9486); }
.icon-chemistry { background: linear-gradient(135deg, #38d4b8, #25b59d); }
.icon-biology   { background: linear-gradient(135deg, #45c97a, #2fa85a); }
.icon-chinese   { background: linear-gradient(135deg, #e87545, #c95528); }
.icon-english   { background: linear-gradient(135deg, #4592e8, #2a70c5); }
.icon-history   { background: linear-gradient(135deg, #c4944a, #a87b3a); }
.icon-geography { background: linear-gradient(135deg, #7ac053, #58a033); }
.icon-politics  { background: linear-gradient(135deg, #b06fbb, #8f4e99); }
.icon-other     { background: linear-gradient(135deg, #9e8faa, #7d6e8a); }

.recent-main {
  flex: 1;
  min-width: 0;
}

.recent-row1 {
  margin-bottom: 5px;
}

.recent-title {
  font-size: 14px;
  color: var(--text);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.recent-row2 {
  display: flex;
  align-items: center;
  gap: 6px;
}

.recent-topic {
  font-size: 11px;
  color: var(--text3);
}

.recent-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  flex-shrink: 0;
}

.badge {
  background: rgba(224, 92, 92, 0.1);
  color: var(--accent3);
  border: 1px solid rgba(224, 92, 92, 0.2);
  border-radius: 16px;
  padding: 3px 8px;
  font-size: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
}

.recent-date {
  font-size: 10px;
  color: var(--text3);
}

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 50px 0;
  gap: 8px;
}

.empty-emoji {
  font-size: 48px;
}

.empty-title {
  font-size: 16px;
  color: var(--text);
  font-weight: 600;
}

.empty-sub {
  font-size: 12px;
  color: var(--text3);
}

.bottom-pad {
  height: 24px;
}

/* ===== 闪卡复习页 ===== */
.card-page {
  padding: 0 20px 140px;
  min-height: 100vh;
}

.card-page .topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
}

.back {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--text);
  flex-shrink: 0;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

.back:hover {
  background: var(--surface2);
}

.back-ghost { visibility: hidden; }

.progress-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.progress-num {
  font-size: 12px;
  color: var(--text2);
  text-align: center;
  letter-spacing: 1px;
  font-weight: 500;
}

.progress-bar {
  height: 4px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.4s ease;
  border-radius: 4px;
}

.flip-wrap {
  width: 100%;
  height: 380px;
  perspective: 1000px;
  margin-bottom: 16px;
}

.flip {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(.2,.8,.2,1);
  cursor: pointer;
}

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

.face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.face-front {
  background: linear-gradient(160deg, var(--surface) 0%, var(--surface2) 100%);
}

.face-back {
  transform: rotateY(180deg);
  background: linear-gradient(160deg, var(--surface2) 0%, var(--surface) 100%);
}

.face-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.face-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  padding: 10px 6px;
}

.card-q {
  font-size: 20px;
  line-height: 1.6;
  color: var(--text);
  font-weight: 500;
}

.card-q-sub {
  font-size: 14px;
  color: var(--text2);
  line-height: 1.6;
}

.face-foot {
  text-align: center;
  margin-top: auto;
}

.hint-pulse {
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 2px;
  animation: pulse 1.6s ease-in-out infinite;
  font-weight: 500;
}

.hint-back {
  font-size: 11px;
  color: var(--text3);
  letter-spacing: 2px;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}

.back-label {
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 1px;
  font-weight: 500;
}

.back-body {
  flex: 1;
  margin: 10px 0;
  overflow-y: auto;
}

.back-note {
  display: block;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  white-space: pre-wrap;
  margin-bottom: 16px;
}

.back-empty {
  display: block;
  color: var(--text3);
  text-align: center;
  margin-top: 50px;
}

.error-box {
  display: flex;
  background: rgba(224, 92, 92, 0.06);
  border-radius: 10px;
  overflow: hidden;
  margin-top: 6px;
}

.error-bar {
  width: 4px;
  background: var(--accent3);
}

.error-content {
  padding: 10px 12px;
  flex: 1;
}

.error-label {
  display: block;
  font-size: 10px;
  color: var(--accent3);
  margin-bottom: 4px;
  letter-spacing: 1px;
  font-weight: 600;
}

.error-text {
  font-size: 13px;
  color: var(--text);
  line-height: 1.6;
}

.rate {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.rate-locked {
  opacity: 0.35;
  pointer-events: none;
  filter: blur(0.3px);
}

.rate-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

.rate-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.rate-emoji { font-size: 24px; }
.rate-label { font-size: 12px; color: var(--text); font-weight: 500; }
.rate-sub { font-size: 10px; color: var(--text3); }

.rate-easy   { border-color: rgba(46, 184, 166, 0.3); background: rgba(46, 184, 166, 0.05); }
.rate-easy   .rate-sub { color: var(--green); }
.rate-medium { border-color: rgba(196, 148, 74, 0.3); background: rgba(196, 148, 74, 0.05); }
.rate-medium .rate-sub { color: var(--accent); }
.rate-hard   { border-color: rgba(224, 92, 92, 0.3); background: rgba(224, 92, 92, 0.05); }
.rate-hard   .rate-sub { color: var(--accent3); }

.meta {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  box-shadow: var(--shadow);
}

.meta-head {
  margin-bottom: 8px;
}

.meta-title {
  font-size: 11px;
  color: var(--text3);
  letter-spacing: 1px;
  font-weight: 500;
}

.meta-row {
  display: flex;
  align-items: center;
  padding: 6px 0;
  font-size: 12px;
}

.meta-key {
  width: 110px;
  color: var(--accent2);
  font-weight: 500;
}

.meta-val {
  flex: 1;
  color: var(--text);
}

.meta-val.accent3 { color: var(--accent3); }
.meta-val.accent { color: var(--accent); }

.meta-tag {
  display: inline-block;
  margin-right: 6px;
  color: var(--text2);
  font-size: 11px;
}

.btn-back {
  margin-top: 16px;
  height: 46px;
  width: 200px;
  border-radius: 16px;
  font-weight: 600;
  letter-spacing: 2px;
}

/* ===== 知识图谱页 ===== */
.graph-page {
  padding: 0 20px 140px;
}

.graph-page .head {
  margin-bottom: 14px;
}

.graph-page .head .title {
  display: block;
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 4px;
}

.graph-page .head .subtitle {
  font-size: 11px;
  color: var(--text2);
  letter-spacing: 0.5px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 14px;
}

.lg-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text2);
  font-weight: 500;
}

.lg-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.bg-math      { background: #6b5ce7; box-shadow: 0 0 8px rgba(107, 92, 231, 0.4); }
.bg-physics   { background: #2eb8a6; box-shadow: 0 0 8px rgba(46, 184, 166, 0.4); }
.bg-chemistry { background: #38d4b8; box-shadow: 0 0 8px rgba(56, 212, 184, 0.4); }
.bg-biology   { background: #45c97a; box-shadow: 0 0 8px rgba(69, 201, 122, 0.4); }
.bg-chinese   { background: #e87545; box-shadow: 0 0 8px rgba(232, 117, 69, 0.4); }
.bg-english   { background: #4592e8; box-shadow: 0 0 8px rgba(69, 146, 232, 0.4); }
.bg-history   { background: #c4944a; box-shadow: 0 0 8px rgba(196, 148, 74, 0.4); }
.bg-geography { background: #7ac053; box-shadow: 0 0 8px rgba(122, 192, 83, 0.4); }
.bg-politics  { background: #b06fbb; box-shadow: 0 0 8px rgba(176, 111, 187, 0.4); }
.bg-other     { background: #9e8faa; box-shadow: 0 0 8px rgba(158, 143, 170, 0.4); }

.canvas-wrap {
  position: relative;
  width: 100%;
  height: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.graph-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text2);
  gap: 10px;
}

.canvas-empty .emoji { font-size: 44px; }

.cloud-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 12px;
}

.cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cloud-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 22px;
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
  box-shadow: var(--shadow);
  font-weight: 500;
}

.cloud-tag:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.cloud-tag .cloud-count {
  font-size: 10px;
  color: var(--text3);
}

.cloud-tag.size-lg {
  font-size: 15px;
  padding: 8px 14px;
  color: var(--text);
}

.cloud-tag.size-sm {
  font-size: 10px;
  padding: 4px 8px;
}

.cloud-tag.subj-math    { color: #8b7cf7; border-color: rgba(107, 92, 231, 0.25); background: rgba(107, 92, 231, 0.06); }
.cloud-tag.subj-physics { color: #2eb8a6; border-color: rgba(46, 184, 166, 0.25); background: rgba(46, 184, 166, 0.06); }
.cloud-tag.subj-chemistry { color: #38d4b8; border-color: rgba(56, 212, 184, 0.25); background: rgba(56, 212, 184, 0.06); }
.cloud-tag.subj-other   { color: #c4944a; border-color: rgba(196, 148, 74, 0.25); background: rgba(196, 148, 74, 0.06); }

.filter {
  margin-top: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: var(--shadow);
}

.filter-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.filter-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 17px;
  color: var(--accent);
  font-weight: 600;
}

.filter-clear {
  font-size: 11px;
  color: var(--text3);
  cursor: pointer;
  font-weight: 500;
}

.filter-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

.filter-item:last-child { border-bottom: none; }

.filter-text {
  flex: 1;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.filter-empty {
  text-align: center;
  color: var(--text3);
  padding: 18px 0;
}

/* ===== 录入页 ===== */
.head .title {
  font-size: 26px;
  display: block;
  margin-bottom: 4px;
  font-weight: 700;
}

.head .subtitle {
  font-size: 12px;
  color: var(--text2);
}

.upload {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--surface);
  margin-bottom: 18px;
  overflow: hidden;
  min-height: 180px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.upload:hover {
  border-color: var(--accent2);
}

.upload-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 50px 0;
}

.upload-icon {
  font-size: 42px;
  margin-bottom: 10px;
  opacity: 0.85;
}

.upload-title {
  color: var(--text);
  font-size: 15px;
  margin-bottom: 4px;
  font-weight: 500;
}

.upload-hint {
  color: var(--text3);
  font-size: 12px;
}

.preview {
  width: 100%;
  height: 240px;
  display: block;
  object-fit: cover;
}

.upload-actions {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: flex;
  gap: 8px;
}

.field {
  margin-bottom: 16px;
}

.label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
  padding-left: 2px;
}

.label-key {
  font-size: 11px;
  color: var(--accent2);
  letter-spacing: 0.5px;
  font-weight: 600;
}

.label-name {
  font-size: 12px;
  color: var(--text2);
}

.input, .textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 14px;
  box-sizing: border-box;
  font-family: inherit;
  transition: border-color 0.2s;
}

.input:focus, .textarea:focus {
  outline: none;
  border-color: var(--accent2);
  box-shadow: 0 0 0 3px rgba(107, 92, 231, 0.1);
}

.textarea {
  min-height: 80px;
  line-height: 1.6;
  resize: vertical;
}

.input::placeholder, .textarea::placeholder {
  color: var(--text3);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  color: var(--text2);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
  box-shadow: var(--shadow);
  font-weight: 500;
}

.chip:hover {
  border-color: var(--accent2);
}

.chip .ico {
  font-size: 11px;
  margin-right: 2px;
}

.chip-emoji .emoji {
  font-size: 15px;
}

.chip-on,
.chip.chip-on {
  color: var(--text) !important;
  background: var(--surface2) !important;
  border-color: var(--accent2) !important;
}

.chip-math      { color: #8b7cf7; border-color: rgba(107, 92, 231,  0.3); background: rgba(107, 92, 231,  0.08); }
.chip-physics   { color: #2eb8a6; border-color: rgba(46,  184, 166, 0.3); background: rgba(46,  184, 166, 0.08); }
.chip-chemistry { color: #38d4b8; border-color: rgba(56,  212, 184, 0.3); background: rgba(56,  212, 184, 0.08); }
.chip-biology   { color: #45c97a; border-color: rgba(69,  201, 122, 0.3); background: rgba(69,  201, 122, 0.08); }
.chip-chinese   { color: #e87545; border-color: rgba(232, 117,  69, 0.3); background: rgba(232, 117,  69, 0.08); }
.chip-english   { color: #4592e8; border-color: rgba(69,  146, 232, 0.3); background: rgba(69,  146, 232, 0.08); }
.chip-history   { color: #c4944a; border-color: rgba(196, 148,  74, 0.3); background: rgba(196, 148,  74, 0.08); }
.chip-geography { color: #7ac053; border-color: rgba(122, 192,  83, 0.3); background: rgba(122, 192,  83, 0.08); }
.chip-politics  { color: #b06fbb; border-color: rgba(176, 111, 187, 0.3); background: rgba(176, 111, 187, 0.08); }
.chip-other     { color: #9e8faa; border-color: rgba(158, 143, 170, 0.3); background: rgba(158, 143, 170, 0.08); }

.actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 24px;
  margin-bottom: 40px;
}

.btn-save {
  height: 50px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 2px;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(107, 92, 231, 0.3);
}

/* ===== 详情页 ===== */
.detail-page {
  padding: 14px 20px 140px;
}

.d-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.d-title {
  font-size: 24px;
  line-height: 1.5;
  display: block;
  margin-bottom: 16px;
  font-weight: 600;
}

.d-image {
  width: 100%;
  border-radius: 14px;
  margin-bottom: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.d-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}

.d-key {
  display: block;
  font-size: 11px;
  color: var(--accent2);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  font-weight: 600;
}

.d-key.accent3 { color: var(--accent3); }

.d-content {
  display: block;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  white-space: pre-wrap;
}

.d-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.d-tag {
  font-size: 12px;
  color: var(--text2);
  background: var(--surface2);
  padding: 4px 10px;
  border-radius: 18px;
  border: 1px solid var(--border);
  font-weight: 500;
}

.detail-page .error-box {
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}

.detail-page .meta {
  margin: 16px 0;
}

.detail-page .actions {
  margin-top: 10px;
}

.detail-page .btn {
  height: 46px;
  border-radius: 14px;
  letter-spacing: 1px;
  font-weight: 500;
}

.d-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text2);
  min-height: 60vh;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 24px;
  color: var(--text);
  font-size: 14px;
  z-index: 1000;
  animation: toastIn 0.3s ease;
  max-width: 340px;
  box-shadow: var(--shadow-lg);
  font-weight: 500;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  max-width: 320px;
  width: 90%;
  box-shadow: var(--shadow-lg);
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.modal-content {
  font-size: 14px;
  color: var(--text2);
  margin-bottom: 18px;
  line-height: 1.6;
}

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

.modal-actions .btn {
  flex: 1;
  font-weight: 500;
}

/* ===== 响应式宽屏：图谱 / 题库 ===== */
@media (min-width: 880px) {
  #app {
    max-width: 1100px;
  }
  .tab-bar {
    max-width: 1100px;
  }
  .page:not(.page-wide) {
    max-width: 480px;
    margin: 0 auto;
  }
  .page-wide {
    padding-left: 28px;
    padding-right: 28px;
  }
}

/* ===== 图谱页 - 增强 ===== */
.graph-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.graph-head-actions {
  display: flex;
  gap: 8px;
}

.ghost-btn {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text2);
  font-size: 14px;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

.ghost-btn:hover {
  background: var(--surface2);
  color: var(--accent2);
  transform: translateY(-1px);
}

.canvas-wrap {
  height: 480px;
  cursor: grab;
}

@media (min-width: 880px) {
  .canvas-wrap {
    height: 620px;
  }
}

.graph-fullscreen {
  position: fixed !important;
  inset: 0 !important;
  z-index: 999;
  border-radius: 0 !important;
  height: 100vh !important;
  margin: 0 !important;
}

.graph-canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.graph-controls {
  position: absolute;
  right: 12px;
  bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 5;
}

.gc-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  user-select: none;
  transition: all 0.15s;
  box-shadow: var(--shadow);
}

.gc-btn:hover {
  background: var(--accent2);
  color: #fff;
  border-color: var(--accent2);
}

.graph-search {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 5;
}

.graph-search input {
  width: 200px;
  height: 34px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  box-shadow: var(--shadow);
  transition: all 0.2s;
}

.graph-search input:focus {
  outline: none;
  border-color: var(--accent2);
  box-shadow: 0 0 0 3px rgba(107, 92, 231, 0.12);
}

.graph-tooltip {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 12px;
  pointer-events: none;
  z-index: 6;
  box-shadow: var(--shadow-lg);
  max-width: 220px;
}

.graph-tooltip .gt-tag {
  font-family: 'Noto Serif SC', serif;
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
}

.graph-tooltip .gt-meta {
  color: var(--text2);
  margin-top: 2px;
  font-size: 11px;
}

.graph-hint {
  font-size: 10px;
  color: var(--text3);
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

/* ===== 题库（Notion-style）===== */
.view-tabs {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
  gap: 2px;
}

.view-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 9px;
  font-size: 13px;
  color: var(--text2);
  cursor: pointer;
  user-select: none;
  font-weight: 500;
  transition: all 0.15s;
}

.view-tab .vt-icon {
  font-size: 13px;
  opacity: 0.8;
}

.view-tab:hover {
  color: var(--text);
}

.view-tab.active {
  background: var(--surface2);
  color: var(--accent2);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.vault-toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.search-wrap {
  position: relative;
  flex: 1;
  min-width: 180px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text3);
  font-size: 14px;
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 38px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 12px 0 32px;
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  box-sizing: border-box;
  transition: all 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent2);
  box-shadow: 0 0 0 3px rgba(107, 92, 231, 0.12);
}

.toolbar-actions {
  display: flex;
  gap: 8px;
}

.tb-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 38px;
  padding: 0 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text2);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
  transition: all 0.15s;
}

.tb-btn:hover {
  border-color: var(--accent2);
  color: var(--text);
}

.tb-btn.on {
  background: var(--surface2);
  color: var(--accent2);
  border-color: var(--accent2);
}

.tb-btn .tb-sub {
  font-size: 11px;
  color: var(--accent2);
  margin-left: 2px;
}

.tb-btn .tb-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent2);
  color: #fff;
  border-radius: 999px;
  font-size: 10px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  font-family: 'JetBrains Mono', monospace;
}

.filter-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}

.filter-group {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.filter-group .fg-key {
  width: 70px;
  flex-shrink: 0;
  font-size: 11px;
  color: var(--accent2);
  letter-spacing: 0.5px;
  font-weight: 600;
  padding-top: 8px;
}

.filter-group .chips {
  flex: 1;
}

.chips-tags {
  max-height: 120px;
  overflow-y: auto;
}

.chip-count {
  font-size: 10px;
  color: var(--text3);
  margin-left: 4px;
}

.sort-menu {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-lg);
  max-width: 220px;
  margin-left: auto;
}

.sort-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
  transition: all 0.15s;
  font-weight: 500;
}

.sort-item:hover {
  background: var(--surface2);
  color: var(--accent2);
}

.sort-arrow {
  color: var(--text3);
  font-size: 11px;
}

/* ===== 表格视图 ===== */
.vault-table {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.vt-row {
  display: grid;
  grid-template-columns: minmax(160px, 2fr) 80px minmax(120px, 1.4fr) 70px 60px 80px 90px;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s;
  font-size: 13px;
}

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

.vt-row:not(.vt-head):hover {
  background: var(--surface2);
}

.vt-head {
  background: var(--surface2);
  font-size: 11px;
  color: var(--text3);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.5px;
  cursor: default;
  text-transform: uppercase;
  font-weight: 600;
}

.vt-cell {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vt-c-tags {
  white-space: normal;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}

.vt-title-text {
  font-weight: 500;
  color: var(--text);
}

.vt-tag {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  font-size: 11px;
}

.vt-tag-more {
  font-size: 10px;
  color: var(--text3);
}

.vt-cnt-pill {
  display: inline-block;
  background: rgba(224, 92, 92, 0.1);
  color: var(--accent3);
  border: 1px solid rgba(224, 92, 92, 0.2);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
}

.status-pill {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 14px;
  font-size: 11px;
  font-weight: 500;
}

.status-mastered {
  background: rgba(46, 184, 166, 0.12);
  color: var(--green);
  border: 1px solid rgba(46, 184, 166, 0.25);
}

.status-due {
  background: rgba(196, 148, 74, 0.12);
  color: var(--accent);
  border: 1px solid rgba(196, 148, 74, 0.25);
}

.status-learning {
  background: rgba(107, 92, 231, 0.10);
  color: var(--accent2);
  border: 1px solid rgba(107, 92, 231, 0.22);
}

@media (max-width: 879px) {
  .vt-row {
    grid-template-columns: 1fr 60px 50px;
    grid-template-areas:
      "title subj cnt"
      "tags tags tags"
      "diff status next";
    row-gap: 6px;
    padding: 12px 14px;
  }
  .vt-c-title { grid-area: title; }
  .vt-c-subj { grid-area: subj; text-align: right; }
  .vt-c-tags { grid-area: tags; }
  .vt-c-cnt { grid-area: cnt; text-align: right; }
  .vt-c-diff { grid-area: diff; }
  .vt-c-status { grid-area: status; text-align: center; }
  .vt-c-next { grid-area: next; text-align: right; font-size: 11px; }
  .vt-head { display: none; }
}

/* ===== 画廊视图 ===== */
.vault-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.gallery-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.gallery-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.gc-cover {
  width: 100%;
  height: 140px;
  object-fit: cover;
  background: var(--surface2);
}

.gc-cover-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Noto Serif SC', serif;
  font-size: 56px;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
}

.gc-cover-math      { background: linear-gradient(135deg, #6b5ce7, #4f3bc7); }
.gc-cover-physics   { background: linear-gradient(135deg, #2eb8a6, #1f9486); }
.gc-cover-chemistry { background: linear-gradient(135deg, #38d4b8, #25b59d); }
.gc-cover-biology   { background: linear-gradient(135deg, #45c97a, #2fa85a); }
.gc-cover-chinese   { background: linear-gradient(135deg, #e87545, #c95528); }
.gc-cover-english   { background: linear-gradient(135deg, #4592e8, #2a70c5); }
.gc-cover-history   { background: linear-gradient(135deg, #c4944a, #a87b3a); }
.gc-cover-geography { background: linear-gradient(135deg, #7ac053, #58a033); }
.gc-cover-politics  { background: linear-gradient(135deg, #b06fbb, #8f4e99); }
.gc-cover-other     { background: linear-gradient(135deg, #9e8faa, #7d6e8a); }

.gc-body {
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.gc-meta {
  display: flex;
  align-items: center;
  gap: 6px;
}

.gc-title {
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.gc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.gc-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 4px;
}

.gc-cnt {
  font-size: 11px;
  color: var(--accent3);
}

/* ===== 看板视图 ===== */
.vault-board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.board-col {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
}

.board-col-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 4px;
}

.board-col-title {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.board-col-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.board-col-count {
  font-size: 11px;
  color: var(--text3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
}

.board-col-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.board-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.board-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent2);
  box-shadow: var(--shadow);
}

.bc-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.bc-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bc-cnt {
  font-size: 11px;
  color: var(--accent3);
}

.board-empty {
  text-align: center;
  color: var(--text3);
  padding: 20px 0;
  font-size: 12px;
  border: 1px dashed var(--border);
  border-radius: 10px;
}

/* ===== 图谱节点标签跳转面板 ===== */
.graph-tag-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-top: 14px;
  box-shadow: var(--shadow);
  gap: 14px;
  flex-wrap: wrap;
}

.gtp-main {
  display: flex;
  align-items: center;
  gap: 8px;
}

.gtp-hash {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  color: var(--accent);
  font-weight: 700;
  line-height: 1;
}

.gtp-name {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  color: var(--text);
  font-weight: 600;
}

.gtp-count {
  font-size: 12px;
  color: var(--text3);
  padding: 3px 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.gtp-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.gtp-goto {
  height: 38px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: 12px;
  white-space: nowrap;
}

.gtp-close {
  height: 38px;
  width: 38px;
  padding: 0;
  border-radius: 12px;
  font-size: 14px;
}

/* ===== Markdown / LaTeX 渲染区域 ===== */
.md-rendered {
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

.md-rendered p {
  margin: 0 0 8px;
}

.md-rendered p:last-child {
  margin-bottom: 0;
}

.md-rendered h1, .md-rendered h2, .md-rendered h3 {
  font-family: 'Noto Serif SC', serif;
  font-weight: 600;
  margin: 12px 0 6px;
  color: var(--text);
}

.md-rendered h1 { font-size: 18px; }
.md-rendered h2 { font-size: 16px; }
.md-rendered h3 { font-size: 14px; }

.md-rendered strong { color: var(--accent); font-weight: 700; }
.md-rendered em { color: var(--text2); font-style: italic; }

.md-rendered code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  color: var(--accent2);
}

.md-rendered pre {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
}

.md-rendered pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  color: var(--text);
}

.md-rendered blockquote {
  border-left: 3px solid var(--accent2);
  margin: 8px 0;
  padding: 6px 12px;
  color: var(--text2);
  background: rgba(107, 92, 231, 0.05);
  border-radius: 0 8px 8px 0;
}

.md-rendered ul, .md-rendered ol {
  padding-left: 20px;
  margin: 6px 0;
}

.md-rendered li { margin: 3px 0; }

.md-rendered .katex-display {
  margin: 10px 0;
  overflow-x: auto;
}

/* 实时预览 */
.md-preview {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  min-height: 60px;
}

.md-preview p { margin: 0 0 8px; }
.md-preview p:last-child { margin-bottom: 0; }
.md-preview h1, .md-preview h2, .md-preview h3 {
  font-family: 'Noto Serif SC', serif;
  margin: 10px 0 6px;
  color: var(--text);
}
.md-preview h1 { font-size: 17px; }
.md-preview h2 { font-size: 15px; }
.md-preview code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  color: var(--accent2);
}
.md-preview pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  overflow-x: auto;
}
.md-preview .katex-display { margin: 8px 0; overflow-x: auto; }
.md-preview strong { color: var(--accent); font-weight: 700; }
.md-preview ul, .md-preview ol { padding-left: 18px; margin: 4px 0; }
.md-preview li { margin: 2px 0; }

.preview-toggle {
  margin-left: auto;
  font-size: 11px;
  color: var(--accent2);
  border: 1px solid rgba(107, 92, 231, 0.3);
  border-radius: 6px;
  padding: 2px 8px;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
  transition: all 0.15s;
}

.preview-toggle:hover, .preview-toggle.on {
  background: rgba(107, 92, 231, 0.1);
}