/* ==========================================================================
       主题: 超新星辉光 (Supernova Glow)
       色板: 深空蓝 (Deep Space Blue) × 超新星蓝 (Supernova Blue)
       ========================================================================== */
    :root {
      /* 基础与层级 */
      --bg: #02030A;
      --surface: #101422;
      --glass: rgba(16, 20, 34, 0.5);
      --line: rgba(0, 191, 255, 0.2);
      --line-soft: rgba(0, 191, 255, 0.1);

      /* 文本 */
      --text: #E0E8FF;
      --text-muted: #7F8DAA;

      /* 品牌与强调色 */
      --brand: #00BFFF; /* Supernova Blue */
      --brand-dark: #00AADD;
      --brand-glow: rgba(0, 191, 255, 0.2);
      --brand-glow-faint: rgba(0, 191, 255, 0.1);

      /* 形状与阴影 */
      --radius: 6px;
      --shadow-glow: 0 0 24px var(--brand-glow);
    }

    /* ==================== 基础排版 ==================== */
    *, *::before, *::after { box-sizing: border-box; }
    html, body { height: 100%; }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
      color: var(--text);
      background-color: var(--bg);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    a { color: inherit; text-decoration: none; }
    img, svg { display: block; max-width: 100%; }
    .container { width: min(1280px, 94vw); margin-inline: auto; }
    section { padding: 60px 0; }
    h1, h2, h3, h4, h5, h6 { color: var(--text); font-weight: 700; line-height: 1.35; }

    /* ==================== 网站页眉 ==================== */
    .site-header {
      position: fixed; inset: 0 0 auto 0; z-index: 1200;
      display: flex; align-items: center;
      background: var(--glass);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--line);
      transition: background .2s ease, height .2s ease;
    }
    .site-header.is-scrolled { background: rgba(16, 20, 34, 0.8); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; width: min(1280px, 94vw); margin-inline: auto; }

    .brand { display: inline-flex; align-items: center; gap: 14px; }
    .logo-crest { width: 42px; height: 42px; }
    .brand-title { font-size: 20px; font-weight: 700; letter-spacing: .5px; }

    .nav { display: flex; align-items: center; gap: 36px; margin-left: auto; } /* 靠右对齐 */
    .nav-item { position: relative; }
    .nav-item a {
      font-weight: 700; font-size: 15px; color: var(--text-muted); position: relative;
      transition: color .2s ease; letter-spacing: 0.5px;
      display: flex; align-items: center; gap: 6px;
    }
    .nav-item a:hover, .nav-item a.is-active { color: var(--brand); }
    .nav-item a::after {
        content: '';
        position: absolute;
        bottom: -8px;
        left: 0;
        right: 0;
        height: 2px;
        background: var(--brand);
        transform: scaleX(0);
        transition: transform .3s ease;
    }
    .nav-item a.is-active::after {
        transform: scaleX(1);
    }
    /* 已删除桌面端下拉箭头 */

    .submenu {
        position: absolute; top: 100%; left: -16px; min-width: 200px;
        background: var(--glass);
        backdrop-filter: blur(10px);
        border: 1px solid var(--line);
        border-radius: var(--radius);
        padding: 8px;
        list-style: none;
        opacity: 0; pointer-events: none;
        transform: translateY(10px);
        transition: opacity .2s ease, transform .2s ease;
        z-index: 10;
    }
    /* 修改：同时支持悬停和JS点击展开 */
    .nav-item.has-submenu:hover .submenu,
    .nav-item.has-submenu.is-open .submenu {
        opacity: 1; pointer-events: auto; transform: translateY(0);
    }
    .submenu a {
        display: block;
        padding: 10px 16px;
        font-weight: 600;
        font-size: 14px;
        border-radius: 4px;
    }
    .submenu a:hover {
        background: var(--brand-glow);
    }
    .submenu a::after { display: none; }


    .menu-toggle { display: none; background: none; border: 0; padding: 6px; cursor: pointer; }
    .menu-toggle span { display: block; width: 28px; height: 2px; background: var(--text); margin: 6px 0; }
    .progress {
      position: fixed; left: 0; right: 0; top: 0; height: 2px; z-index: 1300;
      background: var(--brand);
      transform-origin: left; transform: scaleX(0);
      box-shadow: 0 0 10px var(--brand);
    }

    /* ==================== 首屏区域 (新版式) ==================== */
    @keyframes rotate {
        from { transform: translate(-50%, -50%) rotate(0deg); }
        to { transform: translate(-50%, -50%) rotate(360deg); }
    }
    .hero {
      position: relative; padding: 80px 0 120px; text-align: left;
      min-height: 100vh; display: flex; align-items: center; justify-content: flex-start;
      overflow: hidden;
    }
    .hero::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 150vmax;
        height: 150vmax;
        background: conic-gradient(
            from 0deg,
            var(--bg),
            var(--brand-glow-faint),
            var(--bg) 10%,
            var(--bg)
        );
        animation: rotate 20s linear infinite;
        z-index: 0;
    }
    .hero .container { position: relative; z-index: 2; }
    .eyebrow {
      font-weight: 700; color: var(--brand); letter-spacing: .15em;
      text-transform: uppercase; font-size: 14px;
    }
    .hero h1 { font-size: clamp(40px, 5vw, 64px); line-height: 1.15; margin: 16px 0 20px; letter-spacing: -1.5px; max-width: 960px; }
    .hero p { color: var(--text-muted); font-size: 19px; max-width: 720px; }
    .cta-row { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 40px; justify-content: flex-start; }

    /* ==================== 首屏轨道动画（原样式保留，不删除） ==================== */
    .hero .orbital-container {
        position: absolute;
        top: 1px;
        right: 1px;
        width: 350px;
        height: 350px;
        transform: translateY(-55%);
        pointer-events: none;
        perspective: 1200px;
    }
    .hero .orbital-visual {
        position: relative;
        width: 100%;
        height: 100%;
        transform-style: preserve-3d;
        animation: rotate-3d 40s infinite linear;
    }
    @keyframes rotate-3d {
        0% { transform: rotateY(0deg) rotateX(15deg); }
        100% { transform: rotateY(360deg) rotateX(15deg); }
    }
    .visual-ring {
        position: absolute;
        top: 50%; left: 50%;
        width: 100%; height: 100%;
        margin-top: -50%; margin-left: -50%;
        border-radius: 50%;
        border: 3px solid;
        transform-style: preserve-3d;
    }
    .ring-1 {
        transform: rotateY(90deg) rotateX(0deg) scale(1);
        border-color: var(--line);
    }
    .ring-2 {
        transform: rotateY(90deg) rotateX(60deg) scale(0.8);
        border-color: var(--line-soft);
        border-style: dashed;
    }
    .ring-3 {
        transform: rotateY(90deg) rotateX(120deg) scale(0.6);
        border-color: var(--brand);
        box-shadow: 0 0 16px var(--brand-glow);
    }

    /* ==================== 旋转粒子画布（新增，仅替换右侧特效） ==================== */
    #particle-canvas{
      position:absolute; inset:0; width:100%; height:100%; z-index:1; pointer-events:none;
      /* 位置控制：百分比，越大越靠右，越小越靠上 */
      --fx-x:70%;  /* 水平位置 */
      --fx-y:50%;  /* 垂直位置 */
    }

    .btn {
      --pad: 14px 28px; display: inline-flex; align-items: center; justify-content: center; gap: 10px;
      padding: var(--pad); border-radius: 99px; font-weight: 700;
      border: 1px solid transparent; cursor: pointer; transition: all .2s ease;
      position: relative;
    }
    .btn-primary { background: var(--brand); color: #02030A; }
    .btn-primary:hover { background: var(--brand-dark); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
    .btn-ghost { background: transparent; color: var(--text); border-color: var(--line); }
    .btn-ghost:hover { border-color: var(--brand); color: var(--brand); background: var(--brand-glow-faint); }

    /* ==================== 关键指标 (新版式) ==================== */
    .kpis { background: var(--surface); padding: 48px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .kpi-wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
    .kpi { text-align: center; }
    .kpi .num { font-size: clamp(32px, 4vw, 48px); font-weight: 700; color: var(--brand); letter-spacing: .4px; }
    .kpi .label { color: var(--text-muted); margin-top: 4px; font-size: 14px; text-transform: uppercase; letter-spacing: .8px;}

    /* ==================== 辉光卡片效果 ==================== */
    .solar-card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      position: relative;
      overflow: hidden;
      transition: transform .3s ease, border-color .3s, box-shadow .3s;
    }
    .solar-card::before {
        content: '';
        position: absolute;
        top: 0; left: 0; right: 0; bottom: 0;
        background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), 
                                      var(--brand-glow), 
                                      transparent 250px);
        opacity: 0;
        transition: opacity 0.3s;
        pointer-events: none;
    }
    .solar-card:hover {
        transform: translateY(-6px);
        border-color: rgba(0, 191, 255, 0.4);
        box-shadow: 0 0 16px var(--brand-glow-faint);
    }
    .solar-card:hover::before {
        opacity: 1;
    }

    /* ==================== 主体内容网格布局 ==================== */
    .main-layout {
        display: grid;
        grid-template-columns: 2.5fr 1fr; /* 非对称布局 */
        gap: 48px;
        padding-top: 80px;
    }
    .sidebar .section-title, .main-content .section-title { text-align: left; margin: 0 0 32px; max-width: none; }
    .sidebar .section-title h2, .main-content .section-title h2 { font-size: clamp(24px, 2.8vw, 32px); }
    .sidebar .section-title p, .main-content .section-title p { font-size: 16px; margin-top: 8px; color: var(--text-muted); }

    /* ==================== 文档中心 (新版式) ==================== */
    .cap-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
    .cap {
      display: flex; align-items: flex-start; gap: 20px;
      padding: 24px; /* solar-card provides other styles */
    }
    .icon { color: var(--brand); width: 40px; height: 40px; flex-shrink: 0; }
    .cap h3 { margin: 0 0 8px; font-size: 20px; }
    .cap p { color: var(--text-muted); margin: 0; font-size: 15px; line-height: 1.65; }

    /* ==================== 应用案例 (新版式) ==================== */
    .cases-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
    .case { padding: 24px; }
    .case .chips { justify-content: flex-start; margin-bottom: 12px; display: flex; gap: 8px; }
    .chip { padding: 6px 16px; background: var(--bg); border: 1px solid var(--line); border-radius: 999px; font-weight: 600; font-size: 13px; color: var(--text-muted); }
    .case h4 { margin: 0 0 8px; font-size: 19px; }
    .case p { color: var(--text-muted); margin: 0; font-size: 15px; }

    /* ==================== 侧边栏 ==================== */
    .sidebar { border-left: 1px solid var(--line); padding-left: 48px; }
    
    /* ==================== 实施流程 (新版式) ==================== */
    .timeline { position: relative; border-left: 2px solid var(--line); padding-left: 32px; }
    .t-step { position: relative; padding: 0 0 28px; }
    .t-step:last-child { padding-bottom: 0; }
    .t-dot {
      position: absolute; left: -41px; top: 6px; width: 14px; height: 14px; background: var(--bg);
      border: 2px solid var(--brand); border-radius: 50%; box-shadow: 0 0 12px var(--brand);
      transition: background .3s, box-shadow .3s;
    }
    .t-step:hover .t-dot { background: var(--brand); box-shadow: var(--shadow-glow); }
    .t-step strong { color: var(--text); display: block; margin-bottom: 6px; font-size: 16px; font-weight: 700; }
    .t-step div { color: var(--text-muted); font-size: 14px; }

    /* ==================== 技术栈 & 代码示例 (新版式) ==================== */
    .tech-list { display: flex; flex-direction: column; gap: 20px; }
    .tech-item { display: flex; align-items: flex-start; gap: 16px; }
    .tech-item .icon { width: 32px; height: 32px; }
    .tech-item h3 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
    .tech-item p { margin: 0; color: var(--text-muted); font-size: 14px; line-height: 1.6; }

    .schematic-display {
      margin-top: 40px; height: auto;
      background: var(--surface);
      border: 1px solid var(--line); border-radius: var(--radius); padding: 16px;
      font-family: "SF Mono", "Fira Code", monospace; font-size: 13px;
      overflow: hidden;
    }
    .schematic-header { color: var(--text-muted); padding-bottom: 8px; border-bottom: 1px solid var(--line); margin-bottom: 12px; font-size: 12px; }
    .schematic-code { color: var(--text-muted); white-space: pre; }
    .schematic-code .c1 { color: #82aaff; } .schematic-code .c2 { color: #c3e88d; } .schematic-code .c3 { color: #ffcb6b; } .schematic-code .c4 { color: #f07178; } .schematic-code .c5 { color: #c792ea; }

    /* ==================== 页脚 ==================== */
    footer { background: #060709; border-top: 1px solid var(--line); padding: 80px 0 0; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 48px; }
    footer h4 { margin: 0 0 16px; font-size: 16px; color: var(--text); font-weight: 700; letter-spacing: .8px; }
    footer p, footer a { color: var(--text-muted); font-size: 15px; }
    footer a:hover { color: var(--brand); }
    footer nav a { display: block; margin-bottom: 10px; }
    .legal { text-align: center; padding: 40px 0; color: #555; font-size: 14px; border-top: 1px solid var(--line-soft); margin-top: 40px;}

    /* ==================== 响应式优化 ==================== */
    @media (max-width: 1100px) {
      .main-layout { grid-template-columns: 1fr; } /* 堆叠布局 */
      .sidebar { border-left: none; padding-left: 0; margin-top: 60px; border-top: 1px solid var(--line); padding-top: 60px; }
      .nav { display: none; }
      .menu-toggle { display: inline-block; }
      .hero .orbital-container {
          right: -10%;
          width: 400px;
          height: 400px;
          opacity: 0.8;
      }
    }
    @media (max-width: 768px) {
        section { padding: 40px 0; }
        .hero { padding: 140px 0 100px; text-align: left; justify-content: center; }
        .hero h1, .hero p { margin-inline: auto; }
        .hero .cta-row { justify-content: center; }
        .kpi-wrap { grid-template-columns: repeat(2, 1fr); gap: 24px; }
        .cap-grid { grid-template-columns: 1fr; }
        .footer-grid { grid-template-columns: 1fr 1fr; }
        .footer-grid > div:first-child, .footer-grid > div:last-child { grid-column: 1 / -1; }
        .hero .orbital-container {
            opacity: 0.3;
            transform: translateY(-50%) scale(0.7);
            right: -15%;
        }
    }
    @media (max-width: 600px) {
      .kpi-wrap { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-grid > div { grid-column: auto; }
      .hero .orbital-container {
          display: none;
      }
    }

    /* ==================== 移动端抽屉导航 & 其他 (已重构) ==================== */
    .drawer {
      position: fixed; inset: 0 0 0 auto; width: min(86vw, 320px); background: var(--surface); border-left: 1px solid var(--line);
      transform: translateX(100%); transition: transform .2s ease; z-index: 1300; padding: 24px; display: flex; flex-direction: column;
    }
    .drawer.open { transform: translateX(0); }
    
    .drawer-item {
        border-bottom: 1px solid var(--line-soft);
    }
    .drawer-item > a {
        padding: 12px 8px; font-weight: 700; color: var(--text); display: block;
        position: relative;
    }
    .drawer-item a:hover { color: var(--brand); }

    .drawer-item.has-submenu > a::after {
        content: '';
        position: absolute;
        right: 8px;
        top: 50%;
        width: 0;
        height: 0;
        border-left: 5px solid transparent;
        border-right: 5px solid transparent;
        border-top: 5px solid currentColor;
        transform: translateY(-50%);
        transition: transform .2s ease;
    }
    .drawer-item.has-submenu.is-open > a::after {
        transform: translateY(-50%) rotate(180deg);
    }
    
    .drawer-submenu {
        max-height: 0;
        overflow: hidden;
        transition: max-height .3s ease-out;
        background: rgba(0,0,0,0.15);
        /* 新增：重置样式以确保布局正确 */
        list-style-type: none;
        padding-left: 0;
        margin: 0;
    }
    .drawer-item.is-open > .drawer-submenu {
        max-height: 500px; /* 一个足够大的值以容纳所有子菜单项 */
    }
    .drawer-submenu a {
        display: block;
        width: 100%; /* 新增：强制链接占据整行 */
        padding: 10px 8px 10px 32px;
        font-size: 15px;
        font-weight: 600;
        color: var(--text-muted);
        border-top: 1px solid var(--line-soft);
    }

    .scrim { position: fixed; inset: 0; background: rgba(2, 3, 10, 0.5); backdrop-filter: blur(4px); opacity: 0; pointer-events: none; transition: .2s; z-index: 1250; }
    .scrim.show { opacity: 1; pointer-events: auto; }
    .to-top {
      position: fixed; right: 20px; bottom: 20px; z-index: 1250; opacity: 0; transform: translateY(10px);
      transition: .2s ease; pointer-events: none; border-radius: 50%; width: 48px; height: 48px; padding: 0;
    }
    .to-top.show { opacity: 1; transform: none; pointer-events: auto; }
    .reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.in { opacity: 1; transform: none; }