:root {
      --primary: #3482FF;
      --primary-weak: #EAF2FF;
      --line: #D8E5FF;
      --line-strong: #BFD6FF;
      --text: #1C2B45;
      --text-light: #57729C;
      --bg: #F6F9FF;
      --bg-deep: #EEF4FF;
      --surface: #FFFFFF;
      --surface-soft: #F8FBFF;
      --header-bg: rgba(255, 255, 255, 0.96);
      --radius: 10px;
      --radius-sm: 8px;
      --max-width: 1140px;
    }

    body[data-theme="dark"] {
      --primary: #62A0FF;
      --primary-weak: #162843;
      --line: #2A3D5D;
      --line-strong: #3F5F8A;
      --text: #E4EEFF;
      --text-light: #9CB5D9;
      --bg: #0D1524;
      --bg-deep: #111D31;
      --surface: #101C2E;
      --surface-soft: #13233A;
      --header-bg: rgba(16, 28, 46, 0.94);
    }

    * {
      box-sizing: border-box;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      color: var(--text);
      background: linear-gradient(180deg, var(--surface-soft) 0%, var(--bg) 100%);
      font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
      line-height: 1.65;
      transition: background .25s ease, color .25s ease;
    }

    h1,
    h2,
    h3,
    p {
      margin: 0;
    }

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

    .container {
      width: min(100% - 32px, var(--max-width));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 30;
      border-bottom: 1px solid var(--line);
      background: var(--header-bg);
      backdrop-filter: blur(6px);
      transition: background .25s ease, border-color .25s ease;
    }

    .header-inner {
      min-height: 70px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 8px 0;
      position: relative;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      color: var(--primary);
      font-weight: 700;
      font-size: 18px;
      letter-spacing: .2px;
    }

    .brand-mark {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      font-size: 14px;
      color: var(--primary);
      position: relative;
    }

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

    .menu-toggle {
      width: 38px;
      height: 38px;
      border: 1px solid var(--line);
      border-radius: 10px;
      background: var(--surface);
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background .2s ease, border-color .2s ease, color .2s ease;
    }

    .menu-toggle:hover {
      background: var(--primary-weak);
      border-color: var(--line-strong);
    }

    .menu-toggle {
      display: none;
    }

    .nav {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }

    .nav a {
      border: 1px solid transparent;
      border-radius: 999px;
      color: var(--text-light);
      font-size: 14px;
      padding: 6px 12px;
      transition: all .2s ease;
    }

    .nav a i {
      color: var(--primary);
      margin-right: 6px;
      font-size: 12px;
    }

    .nav a:hover {
      border-color: var(--line);
      color: var(--text);
      background: var(--surface);
    }

    .hero {
      padding: 44px 0 16px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 5px;
      left: 50%;
      transform: translateX(-50%);
      width: min(90%, 980px);
      height: 0px;
      background: linear-gradient(90deg, rgba(52, 130, 255, 0), rgba(52, 130, 255, .4), rgba(52, 130, 255, 0));
    }

    .hero-shell {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      overflow: hidden;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 0;
    }

    .hero-main,
    .hero-panel {
      padding: 34px;
    }

    .hero-main {
      border-right: 1px solid var(--line);
      background: linear-gradient(180deg, var(--surface) 0%, var(--surface-soft) 100%);
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid var(--line);
      border-radius: 999px;
      background: var(--primary-weak);
      color: var(--primary);
      font-size: 12px;
      padding: 5px 12px;
      margin-bottom: 14px;
    }

    h1 {
      font-size: clamp(30px, 3.2vw, 44px);
      line-height: 1.25;
      letter-spacing: .3px;
      margin-bottom: 14px;
    }

    .hero-desc {
      color: var(--text-light);
      margin-bottom: 22px;
      max-width: 660px;
    }

    .actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 22px;
    }

    .btn {
      border: 1px solid var(--primary);
      border-radius: var(--radius-sm);
      min-width: 122px;
      padding: 10px 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 14px;
      transition: all .2s ease;
      cursor: pointer;
    }

    .btn-primary {
      color: #fff;
      background: var(--primary);
    }

    .btn-primary:hover {
      filter: brightness(.94);
    }

    .btn-ghost {
      color: var(--primary);
      background: transparent;
    }

    .btn-ghost:hover {
      background: var(--primary-weak);
    }

    .hero-data {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
    }

    .data-box {
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--surface);
      padding: 10px 12px;
    }

    .data-box strong {
      display: block;
      color: var(--primary);
      font-size: 17px;
      line-height: 1.2;
      margin-bottom: 3px;
    }

    .data-box span {
      color: var(--text-light);
      font-size: 12px;
    }

    .hero-panel {
      background: var(--bg-deep);
    }

    .panel-title {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 18px;
      margin-bottom: 12px;
    }

    .panel-title i {
      color: var(--primary);
      font-size: 16px;
    }

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

    .stack li {
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--surface);
      padding: 10px 12px;
      color: var(--text-light);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .stack li i {
      color: var(--primary);
      font-size: 13px;
      width: 16px;
      text-align: center;
    }

    .status-chip {
      margin-top: 14px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid var(--line);
      border-radius: 999px;
      padding: 4px 12px;
      color: var(--text-light);
      font-size: 12px;
      background: var(--surface);
    }

    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #2ecc71;
      animation: blinkDot 1.8s ease infinite;
    }

    @keyframes blinkDot {
      0% {
        opacity: .35;
      }

      50% {
        opacity: 1;
      }

      100% {
        opacity: .35;
      }
    }

    .brand-strip {
      padding: 8px 0 34px;
    }

    .strip-shell {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 0;
      overflow: hidden;
    }

    .strip-item {
      padding: 14px 16px;
      border-right: 1px solid var(--line);
      display: flex;
      align-items: center;
      gap: 9px;
      color: var(--text-light);
      font-size: 13px;
    }

    .strip-item:last-child {
      border-right: 0;
    }

    .strip-item i {
      color: var(--primary);
      font-size: 14px;
    }

    section {
      padding: 18px 0 54px;
    }

    .section-shell {
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: var(--surface);
      padding: 26px;
      position: relative;
      overflow: hidden;
    }

    .section-shell::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0;
      height: 2px;
      width: 100%;
      background: linear-gradient(90deg, var(--primary) 0%, rgba(52, 130, 255, 0) 60%);
    }

    .section-head {
      margin-bottom: 16px;
    }

    .section-head h2 {
      font-size: 28px;
      line-height: 1.3;
      margin-bottom: 8px;
    }

    .section-head p {
      color: var(--text-light);
      max-width: 760px;
    }

    .cards {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 14px;
    }

    .card {
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--surface);
      padding: 18px;
      transition: transform .2s ease, border-color .2s ease;
    }

    .card:hover {
      transform: translateY(-2px);
      border-color: var(--line-strong);
    }

    .icon-chip {
      width: 34px;
      height: 34px;
      border-radius: 8px;
      border: 1px solid var(--line);
      background: var(--primary-weak);
      display: grid;
      place-items: center;
      margin-bottom: 10px;
      color: var(--primary);
      font-size: 14px;
    }

    .card h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }

    .card p {
      color: var(--text-light);
      font-size: 14px;
    }

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

    .process-item {
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--surface);
      padding: 16px;
      position: relative;
    }

    .process-num {
      color: var(--primary);
      font-size: 20px;
      font-weight: 700;
      line-height: 1;
      margin-bottom: 8px;
    }

    .process-item h3 {
      font-size: 16px;
      margin-bottom: 6px;
    }

    .process-item p {
      color: var(--text-light);
      font-size: 13px;
    }

    .contact-wrap {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .contact-box {
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      background: var(--surface);
      padding: 20px;
    }

    .contact-box h3 {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 18px;
      margin-bottom: 8px;
    }

    .contact-box h3 i {
      color: var(--primary);
      font-size: 15px;
    }

    .contact-list {
      list-style: none;
      margin: 12px 0 0;
      padding: 0;
      display: grid;
      gap: 9px;
      color: var(--text-light);
    }

    .contact-list li {
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }

    .contact-list i {
      color: var(--primary);
      width: 16px;
      margin-top: 4px;
      text-align: center;
    }

    .contact-list strong {
      color: var(--text);
      margin-right: 8px;
      font-weight: 600;
    }

    .site-footer {
      border-top: 1px solid var(--line);
      background: var(--surface);
      padding: 24px 0 34px;
      color: var(--text-light);
      transition: background .25s ease, border-color .25s ease;
    }

    .footer-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: flex-start;
      justify-content: space-between;
      gap: 10px 24px;
      font-size: 14px;
    }

    .footer-left {
      display: grid;
      gap: 6px;
    }

    .runtime {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      color: var(--text-light);
      font-size: 13px;
    }

    .runtime i {
      color: var(--primary);
      font-size: 12px;
    }

    .footer-records {
      display: inline-flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 5px;
    }

    .footer-records span {
      display: inline-flex;
      align-items: center;
      gap: 7px;
    }

    .footer-records i {
      color: var(--primary);
      font-size: 12px;
    }

    .to-top {
      position: fixed;
      right: 22px;
      bottom: 24px;
      width: 46px;
      height: 46px;
      border: 1px solid var(--line-strong);
      border-radius: 12px;
      background: var(--surface);
      color: var(--primary);
      display: grid;
      place-items: center;
      cursor: pointer;
      opacity: 0;
      visibility: hidden;
      transform: translateY(12px);
      transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
      z-index: 35;
    }

    .theme-float {
      position: fixed;
      right: 22px;
      bottom: 78px;
      width: 46px;
      height: 46px;
      border: 1px solid var(--line-strong);
      border-radius: 12px;
      background: var(--surface);
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background .2s ease, border-color .2s ease, color .2s ease;
      z-index: 35;
    }

    .theme-float:hover {
      background: var(--primary-weak);
    }

    .theme-float i {
      font-size: 17px;
    }

    .to-top:hover {
      background: var(--primary-weak);
    }

    .to-top.show {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    .to-top i {
      font-size: 18px;
    }

    .reveal {
      opacity: 0;
      transform: translateY(14px);
      transition: opacity .45s ease, transform .45s ease;
    }

    .reveal.in {
      opacity: 1;
      transform: translateY(0);
    }

    .hero-shell.reveal {
      transition-delay: .06s;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }

      .hero-main {
        border-right: 0;
        border-bottom: 1px solid var(--line);
      }

      .strip-shell {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .process-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .contact-wrap {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 760px) {
      .header-inner {
        align-items: center;
        min-height: 62px;
      }

      .menu-toggle {
        display: inline-flex;
      }

      .nav {
        position: absolute;
        left: 16px;
        right: 16px;
        top: calc(100% + 8px);
        z-index: 40;
        background: var(--surface);
        border: 1px solid var(--line);
        border-radius: 10px;
        padding: 10px;
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        opacity: 0;
        transform: translateY(-8px);
        pointer-events: none;
        transition: opacity .2s ease, transform .2s ease;
      }

      .nav.show {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
      }

      .nav a {
        display: block;
      }

      .nav a {
        border: 1px solid var(--line);
        border-radius: 8px;
        padding: 7px 10px;
        background: var(--surface);
      }

      .hero-main,
      .hero-panel,
      .section-shell {
        padding: 20px;
      }

      .hero-data,
      .cards,
      .process-grid,
      .strip-shell {
        grid-template-columns: 1fr;
      }

      .footer-records {
        align-items: flex-start;
      }

      .to-top {
        right: 16px;
        bottom: 18px;
      }

      .theme-float {
        right: 16px;
        bottom: 72px;
      }
    }