/* Screen-reader only – 对用户不可见，但对 SEO 爬虫可见 */
    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border: 0;
    }
    :root {
      --bg: #07111c;
      --panel: rgba(13, 26, 42, .88);
      --panel-2: rgba(18, 34, 53, .78);
      --line: rgba(125, 153, 190, .16);
      --line-soft: rgba(125, 153, 190, .09);
      --text: #e9f2ff;
      --muted: #91a0b4;
      --muted-2: #6f7f94;
      --blue: #3b82f6;
      --blue-deep: #14376e;
      --red: #ff5b57;
      --green: #61d18c;
      --yellow: #ffbc4b;
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      min-height: 100vh;
      color: var(--text);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      background:
        radial-gradient(circle at 57% 0%, rgba(29, 83, 138, .22), transparent 34%),
        radial-gradient(circle at 18% 36%, rgba(34, 95, 174, .08), transparent 27%),
        linear-gradient(135deg, #07111c 0%, #081521 45%, #050d16 100%);
      overflow-x: hidden;
      overflow-y: auto;
    }

    a { color: inherit; text-decoration: none; }

    .page {
      display: grid;
      grid-template-columns: 225px 1fr;
      max-width: 1600px;
      width: 100%;
      min-height: 1024px;
      margin: 0 auto;
    }

    .sidebar {
      display: flex;
      flex-direction: column;
      padding: 28px 16px 24px;
      border-right: 1px solid rgba(120, 150, 185, .12);
      background: linear-gradient(180deg, rgba(12, 24, 39, .88), rgba(8, 18, 31, .76));
      box-shadow: inset -18px 0 48px rgba(0, 0, 0, .16);
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      margin: 0 4px 34px;
    }

    .brand-icon {
      display: grid;
      flex-shrink: 0;
      place-items: center;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: radial-gradient(circle at 65% 20%, #2c65bd, #142e67 58%, #0a1d44);
      box-shadow: 0 0 24px rgba(56, 128, 255, .22);
    }

    .brand-icon svg { width: 32px; height: 22px; }

    .brand-title {
      display: block;
      margin: 0;
      font-size: 22px;
      line-height: 1;
      letter-spacing: -.04em;
      font-weight: 700;
      white-space: nowrap;
    }

    .brand p {
      margin: 5px 0 0;
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }

    .nav {
      display: grid;
      gap: 9px;
    }

    .nav a {
      display: flex;
      align-items: center;
      gap: 13px;
      height: 44px;
      padding: 0 13px;
      border-radius: 7px;
      color: #a8b5c8;
      font-size: 16px;
    }

    .nav a.active {
      color: #fff;
      background: linear-gradient(90deg, rgba(37, 99, 235, .55), rgba(37, 99, 235, .28));
    }

    .nav svg {
      width: 18px;
      height: 18px;
      stroke: currentColor;
      stroke-width: 1.7;
      fill: none;
    }

    .hint {
      margin-top: auto;
      padding: 18px 16px 19px;
      border: 1px solid var(--line);
      border-radius: 7px;
      background: linear-gradient(180deg, rgba(25, 43, 66, .72), rgba(14, 28, 45, .86));
    }

    .hint h2 {
      margin: 0 0 13px;
      color: #68a9ff;
      font-size: 15px;
    }

    .hint p {
      margin: 0;
      color: #a2aec1;
      font-size: 12px;
      line-height: 1.7;
    }

    .hint a {
      display: inline-flex;
      margin-top: 14px;
      color: #5ea3ff;
      font-size: 13px;
    }

    .theme {
      display: flex;
      align-items: center;
      gap: 10px;
      margin: 92px 14px 24px;
      color: #c5d1e4;
      font-size: 14px;
    }

    .copyright {
      margin: 0 12px;
      color: #748197;
      font-size: 12px;
      line-height: 1.65;
    }

    .main {
      padding: 18px 24px 24px 14px;
    }

    .topbar {
      display: grid;
      grid-template-columns: 1fr 440px;
      align-items: center;
      gap: 24px;
      min-height: 44px;
      margin-bottom: 18px;
    }

    .ticker {
      display: flex;
      align-items: center;
      gap: 13px;
      color: #d7e5fa;
      font-size: 15px;
      min-width: 0;
    }

    .ticker > span:last-child {
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .ticker .sound {
      display: grid;
      place-items: center;
      width: 29px;
      height: 29px;
      color: #60a5fa;
      border-radius: 50%;
      background: rgba(37, 99, 235, .28);
      transition: color .3s;
    }

    .actions {
      display: flex;
      justify-content: flex-end;
      gap: 14px;
    }

    .search {
      display: flex;
      align-items: center;
      gap: 10px;
      width: 318px;
      height: 39px;
      padding: 0 13px;
      border: 1px solid rgba(127, 156, 190, .16);
      border-radius: 6px;
      color: #8d9bad;
      background: rgba(9, 20, 34, .62);
      font-size: 13px;
    }

    .fav {
      width: 82px;
      height: 39px;
      color: #d8e2f2;
      border: 1px solid rgba(127, 156, 190, .16);
      border-radius: 6px;
      background: rgba(9, 20, 34, .62);
      font: inherit;
      cursor: pointer;
      transition: all .2s;
    }

    .fav:hover {
      background: rgba(37, 99, 235, .28);
      border-color: rgba(59, 130, 246, .4);
    }

    .fav.active {
      color: #f5c542;
      background: rgba(245, 197, 66, .15);
      border-color: rgba(245, 197, 66, .4);
    }

    .update {
      margin: -6px 7px 9px 0;
      text-align: right;
      color: #8fa0b4;
      font-size: 13px;
    }

    .grid {
      display: grid;
      grid-template-columns: 310px 640px 370px;
      grid-template-rows: 350px 363px 188px;
      gap: 14px 16px;
      align-items: start;
    }

    .card {
      position: relative;
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: 7px;
      background:
        radial-gradient(circle at 15% 10%, rgba(81, 139, 216, .08), transparent 34%),
        linear-gradient(180deg, rgba(18, 35, 55, .84), rgba(10, 22, 36, .84));
      box-shadow: 0 18px 35px rgba(0, 0, 0, .17);
    }

    .metric {
      height: 350px;
      padding: 24px 26px;
    }

    .metric h2,
    .panel-title {
      margin: 0;
      font-size: 20px;
      letter-spacing: -.02em;
    }

    .sub {
      margin: 7px 0 19px;
      color: #91a1b5;
      font-size: 14px;
    }

    .big-number {
      display: flex;
      align-items: baseline;
      gap: 12px;
      margin-bottom: 8px;
    }

    .big-number strong {
      font-size: 52px;
      line-height: 1;
      letter-spacing: -.04em;
    }

    .big-number span {
      font-size: 15px;
    }

    .time {
      padding-bottom: 24px;
      border-bottom: 1px solid var(--line-soft);
      color: #98a7ba;
      font-size: 12px;
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px 23px;
      margin-top: 19px;
    }

    .stats p {
      margin: 0 0 9px;
      color: #8e9db1;
      font-size: 13px;
    }

    .stats b {
      color: #e7effb;
      font-size: 16px;
      font-weight: 600;
    }

    .chart-1 {
      height: 350px;
      padding: 18px 22px 14px;
    }

    .tabs {
      position: absolute;
      top: 21px;
      left: 36px;
      right: 95px;
      display: flex;
      justify-content: space-around;
      color: #aab6c6;
      font-size: 14px;
    }

    .tabs span {
      padding: 7px 16px;
      border-radius: 5px;
      cursor: pointer;
      transition: background .15s ease, color .15s ease;
    }
    .tabs span:hover:not(.on) {
      background: rgba(45, 88, 154, .25);
    }

    .tabs .on {
      color: #fff;
      background: linear-gradient(180deg, rgba(45, 88, 154, .74), rgba(31, 65, 123, .58));
    }

    .chart-area {
      margin-top: 52px;
    }

    .gauge {
      height: 323px;
      padding: 21px 26px;
    }

    .gauge h2 { margin-bottom: 7px; }

    .gauge svg {
      display: block;
      width: 314px;
      height: 205px;
      margin: 0 auto;
      overflow: visible;
    }

    .gauge .value {
      margin-top: -35px;
      text-align: center;
    }

    .gauge .value strong {
      display: block;
      font-size: 34px;
      line-height: 1;
      letter-spacing: -.02em;
    }

    .gauge .value span {
      display: block;
      margin-top: 9px;
      font-size: 17px;
      font-weight: 700;
    }

    .gauge p {
      margin: 18px 0 0;
      color: #a4afc0;
      font-size: 12px;
      text-align: center;
    }

    .long {
      grid-column: 1 / 3;
      grid-row: 2;
      height: 363px;
      padding: 21px 20px 16px;
    }

    .card-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 4px;
    }

    .selects {
      display: flex;
      gap: 12px;
      margin-right: 2px;
    }

    .selects span {
      padding: 8px 13px;
      border: 1px solid var(--line);
      border-radius: 6px;
      color: #e7edf7;
      background: rgba(27, 43, 65, .78);
      font-size: 14px;
    }

    .right-stack {
      display: grid;
      grid-row: 2 / span 2;
      gap: 10px;
      align-self: start;
    }

    .table-card {
      height: 210px;
      padding: 16px 20px;
    }

    .mini-card {
      height: 170px;
      padding: 15px 20px;
    }

    .more {
      color: #6aa8ff;
      font-size: 13px;
    }

    table {
      width: calc(100% + 40px);
      margin: 10px -20px 0;
      border-collapse: collapse;
      font-size: 14px;
    }

    th {
      height: 32px;
      padding: 0 20px;
      color: #a2afc1;
      font-weight: 500;
      text-align: right;
      background: rgba(38, 55, 76, .34);
    }

    th:first-child,
    td:first-child { text-align: left; }

    td {
      height: 32px;
      padding: 0 20px;
      color: #d5deeb;
      text-align: right;
      white-space: nowrap;
    }

    .red { color: var(--red); }
    .green { color: #54c987; }

    .news {
      height: 165px;
      padding: 15px 20px;
    }

    .news-list,
    .data-list {
      display: grid;
      gap: 11px;
      margin-top: 11px;
      color: #c3cedd;
      font-size: 13px;
    }

    .row {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 15px;
    }

    .row time {
      color: #708198;
    }

    .explain {
      grid-column: 1 / 3;
      grid-row: 3;
      height: 188px;
      padding: 21px;
    }

    .explain-items {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 27px;
    }

    .explain-item {
      display: grid;
      grid-template-columns: 52px 1fr;
      gap: 16px;
      align-items: center;
    }

    .round {
      display: grid;
      place-items: center;
      width: 52px;
      height: 52px;
      border-radius: 50%;
    }

    .purple { background: linear-gradient(135deg, #302461, #514194); }
    .cyan { background: linear-gradient(135deg, #163a66, #356b92); }
    .teal { background: linear-gradient(135deg, #126450, #2b8b68); }

    .explain-item h3 {
      margin: 0 0 8px;
      font-size: 15px;
    }

    .explain-item p {
      margin: 0;
      color: #9aa8bb;
      font-size: 12px;
      line-height: 1.55;
    }

    svg text {
      font-family: Inter, "Microsoft YaHei", sans-serif;
    }

    /* ===== 响应式：平板 (≤1024px) ===== */
    @media (max-width: 1024px) {
      .page {
        grid-template-columns: 1fr;
        max-width: 100%;
      }
      .sidebar {
        display: none;
      }
      .main {
        padding: 14px 12px;
      }
      .topbar {
        grid-template-columns: 1fr;
        height: auto;
        gap: 10px;
      }
      .actions {
        justify-content: flex-start;
        flex-wrap: wrap;
      }
      .grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
      }
      .long {
        grid-column: 1;
        grid-row: auto;
      }
      .right-stack {
        grid-column: 1;
        grid-row: auto;
      }
      .explain {
        grid-column: 1;
        grid-row: auto;
      }
      .chart-1 svg,
      .long svg {
        width: 100%;
        height: auto;
      }
      .stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* ===== 响应式：手机 (≤640px) ===== */
    @media (max-width: 640px) {
      .topbar {
        grid-template-columns: 1fr;
      }
      .ticker {
        font-size: 13px;
      }
      .search {
        width: 100%;
      }
      .metric {
        padding: 18px 16px;
        height: auto;
      }
      .big-number strong {
        font-size: 36px;
      }
      .stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
      }
      .card {
        height: auto;
      }
      .chart-1 {
        height: auto;
        min-height: 280px;
      }
      .long {
        height: auto;
        min-height: 320px;
      }
      .gauge {
        height: auto;
      }
      .tabs {
        position: static;
        margin-bottom: 12px;
      }
      .explain-items {
        grid-template-columns: 1fr;
        gap: 16px;
      }
      table {
        width: 100%;
        margin: 10px 0 0;
      }
      th, td {
        padding: 0 8px;
        font-size: 12px;
      }
    }


/* ===== 子页面通用布局 ===== */

.subpage-header {
  padding: 32px 40px 24px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 35, 55, .9), rgba(10, 22, 36, .85));
}

.subpage-header nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 16px;
  max-width: 900px;
  margin: 0 auto;
}

.subpage-header nav > a {
  color: var(--muted);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 5px;
  text-decoration: none;
  white-space: nowrap;
}

.subpage-header nav > a:hover,
.subpage-header nav > a.active {
  color: var(--text);
  background: rgba(55, 105, 210, .25);
}

.subpage-header h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: -.02em;
}

.subpage-header p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.subpage-main {
  padding: 28px 40px;
  max-width: 900px;
  margin: 0 auto;
}

.subpage-main h2 {
  margin: 32px 0 14px;
  font-size: 20px;
  color: var(--text);
}

.subpage-main h2:first-child { margin-top: 0; }

.subpage-main h3 {
  margin: 20px 0 10px;
  font-size: 17px;
  color: var(--text);
}

.subpage-main p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.subpage-main ul {
  margin: 0 0 16px;
  padding-left: 20px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.subpage-main ul li { margin-bottom: 6px; }

.subpage-footer {
  max-width: 900px;
  margin: 24px auto 32px;
  padding: 20px 40px 0;
  border-top: 1px solid var(--line-soft);
  text-align: center;
}

.subpage-footer a {
  color: var(--blue);
  font-size: 14px;
}

.subpage-footer a:hover { color: #68a9ff; }

.logo-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

.mini-icon { font-size: 22px; }

.nav-links {
  display: flex;
  gap: 6px 16px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 5px;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: rgba(55, 105, 210, .25);
}

/* ===== 通用卡片/统计 ===== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.stat-card {
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: linear-gradient(180deg, rgba(18, 35, 55, .84), rgba(10, 22, 36, .84));
}

.stat-label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted-2);
  font-size: 12px;
  text-transform: uppercase;
}

.stat-value {
  display: block;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.02em;
}

.stat-change {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 600;
}

.stat-change.red { color: var(--red); }
.stat-change.green { color: var(--green); }

/* ===== 内容区域 ===== */

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

.content-section p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.subtitle {
  color: var(--muted);
  font-size: 15px;
}

.highlight {
  color: var(--yellow);
  font-weight: 600;
}

/* ===== 功能卡片 (about.html) ===== */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.feature-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: linear-gradient(135deg, rgba(18, 35, 55, .7), rgba(10, 22, 36, .7));
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--text);
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

/* ===== VIX 解读表格 (vix-index.html) ===== */

.interpretation-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}

.interpretation-table th,
.interpretation-table td {
  padding: 10px 14px;
  border: 1px solid var(--line);
  font-size: 14px;
}

.interpretation-table th {
  background: rgba(38, 55, 76, .4);
  color: var(--muted);
  font-weight: 500;
  text-align: left;
}

.interpretation-table td {
  color: var(--text);
}

.interp-range { color: var(--blue); }
.interp-label { font-weight: 600; }
.interp-desc { color: var(--muted); font-size: 13px; }

/* ===== Hero 统计 (vix-index.html) ===== */

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 16px 0 24px;
}

/* ===== 时间线 (historical-data.html) ===== */

.timeline {
  position: relative;
  padding-left: 24px;
  border-left: 2px solid var(--line);
}

.timeline-item {
  position: relative;
  margin-bottom: 20px;
  padding-left: 16px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  border: 2px solid var(--bg);
}

.timeline-date {
  display: block;
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-desc {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

/* ===== 市场情绪等级 (market-sentiment.html) ===== */

.levels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.level {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: rgba(18, 35, 55, .5);
  text-align: center;
}

.level-label {
  display: block;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
}

.level-range {
  display: block;
  color: var(--muted-2);
  font-size: 12px;
  margin-bottom: 6px;
}

.level-desc {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

/* ===== 新闻列表 (news.html) ===== */

.news-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.news-item h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

.news-item a { color: var(--text); }
.news-item a:hover { color: var(--blue); }

.news-item p {
  margin: 0;
  color: var(--muted-2);
  font-size: 12px;
}