:root {
        --blue: #2563eb;
        --blue-700: #1d4ed8;
        --blue-950: #142554;
        --cyan: #0891b2;
        --green: #16a34a;
        --amber: #f59e0b;
        --gold: #fbbf24;
        --red: #dc2626;
        --ink: #0f172a;
        --text: #334155;
        --muted: #64748b;
        --line: #dbe7fb;
        --surface: #ffffff;
        --soft: #f4f8ff;
        --soft-blue: #eaf3ff;
        --dark: #0a1733;
        --dark-2: #122244;
        --radius: 8px;
        --shadow: 0 22px 60px rgba(30, 64, 175, 0.12);
        --shadow-card: 0 12px 36px rgba(30, 64, 175, 0.06);
      }

      * { box-sizing: border-box; }
      body {
        margin: 0;
        background: #f7fbff;
        color: var(--ink);
        font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Inter, Arial, sans-serif;
        line-height: 1.7;
      }
      a { color: inherit; text-decoration: none; }
      img { display: block; max-width: 100%; }
      .container { width: min(1180px, calc(100% - 64px)); margin: 0 auto; }

      /* 顶部跑马灯 */
      .topline {
        height: 34px;
        background: #1459d9;
        color: #eaf3ff;
        font-size: 13px;
        display: flex;
        align-items: center;
        overflow: hidden;
        position: relative;
        white-space: nowrap;
      }
      .topline-track {
        display: inline-flex;
        align-items: center;
        white-space: nowrap;
        position: absolute;
        left: 0;
        animation: topline-pingpong 38s ease-in-out infinite;
      }
      .topline-track span {
        opacity: 0.92;
        padding: 0;
        display: inline-flex;
        align-items: center;
      }
      .topline-track span::after { content: "\00a0\00a0\00a0"; opacity: 0.5; }
      .topline-track span:last-child::after { content: ""; }
      .topline:hover .topline-track { animation-play-state: paused; }
      @keyframes topline-pingpong {
        0% { left: 0; }
        45% { left: calc(100% - var(--track-w, 400px)); }
        55% { left: calc(100% - var(--track-w, 400px)); }
        100% { left: 0; }
      }

      /* 导航 */
      .nav {
        height: 76px;
        background: rgba(255, 255, 255, 0.78);
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
        border-bottom: 1px solid rgba(219, 231, 251, 0.7);
        position: sticky; top: 0; z-index: 20;
        box-shadow: 0 1px 0 rgba(15, 23, 42, 0.02);
      }
      .nav-inner {
        height: 76px;
        display: flex; align-items: center; justify-content: space-between;
        gap: 24px;
      }
      .brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
      .brand-logo {
        width: 44px; height: 44px; border-radius: 50%;
        background: linear-gradient(135deg, #1d4ed8, #0891b2);
        display: grid; place-items: center;
        color: #fff; font-weight: 800; font-size: 20px;
        box-shadow: 0 6px 16px rgba(37, 99, 235, 0.28);
        flex: 0 0 auto;
      }
      .brand-name { font-weight: 800; font-size: 21px; line-height: 1.05; display: block; }
      .brand-sub { color: var(--muted); font-size: 12px; margin-top: 4px; display: block; }
      .nav-links {
        display: flex; align-items: center; gap: 4px;
        background: rgba(241, 245, 249, 0.7);
        border: 1px solid rgba(226, 232, 240, 0.8);
        padding: 5px;
        border-radius: 999px;
        color: #475569; font-size: 14px; font-weight: 600;
        flex: 1; justify-content: center; max-width: 760px;
        margin: 0 auto;
      }
      .nav-links a {
        position: relative;
        display: inline-flex; align-items: center;
        padding: 8px 16px; border-radius: 999px;
        color: #475569; text-decoration: none; white-space: nowrap;
        line-height: 1.2;
        transition: color 0.2s, background 0.2s;
      }
      .nav-links a:hover {
        color: #1d4ed8; background: rgba(37, 99, 235, 0.06);
      }
      .nav-links a.active {
        color: #fff;
        background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
        box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
      }
      .nav-links a.active:hover {
        color: #fff; background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
      }
      .nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

      .btn {
        min-height: 44px; padding: 0 22px;
        border-radius: 999px;
        display: inline-flex; align-items: center; justify-content: center;
        font-weight: 700; font-size: 14px;
        border: 1px solid transparent; cursor: pointer; white-space: nowrap;
        transition: transform 0.2s, box-shadow 0.2s;
      }
      .btn-primary {
        color: #fff; background: var(--blue);
        box-shadow: 0 12px 28px rgba(37, 99, 235, 0.26);
      }
      .btn-secondary { color: var(--blue-700); background: #fff; border-color: #bfd6ff; }
      .btn-gold {
        color: var(--dark); background: var(--gold);
        box-shadow: 0 12px 28px rgba(251, 191, 36, 0.3);
      }
      .btn-gold:hover { transform: translateY(-2px); }
      .btn-outline {
        color: #dbeafe; background: transparent; border-color: rgba(219, 234, 254, 0.4);
      }
      .btn-outline:hover { border-color: var(--gold); color: var(--gold); }

      /* 面包屑 */
      .breadcrumb { padding: 18px 0 0; font-size: 13px; color: var(--muted); }
      .breadcrumb a:hover { color: var(--blue); }
      .breadcrumb .sep { margin: 0 8px; opacity: 0.5; }
      .breadcrumb .current { color: var(--ink); font-weight: 600; }

      /* ===== 企业风格 Hero（深色，区别于小团队明亮风） ===== */
      .hero-enterprise {
        position: relative;
        background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 50%, #1a2d5c 100%);
        color: #fff;
        padding: 64px 0 72px;
        overflow: hidden;
      }
      .hero-glow {
        position: absolute;
        top: -100px; right: -100px;
        width: 500px; height: 500px;
        background: radial-gradient(circle, rgba(37, 99, 235, 0.25), transparent 65%);
        pointer-events: none;
      }
      .hero-enterprise-grid {
        position: relative; z-index: 1;
        display: grid;
        grid-template-columns: 1.1fr 0.9fr;
        gap: 48px;
        align-items: center;
      }
      .hero-tag {
        display: inline-block;
        padding: 6px 14px;
        background: rgba(251, 191, 36, 0.15);
        border: 1px solid rgba(251, 191, 36, 0.4);
        border-radius: 999px;
        color: var(--gold);
        font-size: 12px;
        font-weight: 800;
        letter-spacing: 1px;
        margin-bottom: 20px;
      }
      .hero-enterprise h1 {
        font-size: 48px;
        line-height: 1.15;
        margin: 0 0 20px;
        color: #fff;
      }
      .hero-enterprise h1 .accent { color: var(--gold); }
      .hero-lead {
        font-size: 17px;
        line-height: 1.8;
        color: #cbd5e1;
        max-width: 520px;
        margin: 0 0 28px;
      }
      .hero-lead strong { color: #fff; }
      .hero-actions { display: flex; gap: 12px; margin-bottom: 36px; flex-wrap: wrap; }
      .hero-stats { display: flex; gap: 36px; flex-wrap: wrap; }
      .hero-stats .stat { display: flex; flex-direction: column; }
      .hero-stats .num { font-size: 28px; font-weight: 800; color: var(--gold); line-height: 1; }
      .hero-stats .lbl { font-size: 12px; color: #94a3b8; margin-top: 6px; }

      /* 轨道环视觉（企业风格，区别于小团队的方块网格） */
      .hero-visual {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 360px;
      }
      .orbit-ring {
        position: relative;
        width: 340px; height: 340px;
      }
      .orbit-ring::before {
        content: "";
        position: absolute;
        inset: 20px;
        border: 1.5px dashed rgba(251, 191, 36, 0.25);
        border-radius: 50%;
        animation: orbit-rotate 30s linear infinite;
      }
      .orbit-ring::after {
        content: "";
        position: absolute;
        inset: 60px;
        border: 1px solid rgba(37, 99, 235, 0.3);
        border-radius: 50%;
      }
      @keyframes orbit-rotate {
        to { transform: rotate(360deg); }
      }
      .orbit-core {
        position: absolute;
        top: 50%; left: 50%;
        transform: translate(-50%, -50%);
        width: 100px; height: 100px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--blue), var(--cyan));
        display: grid; place-items: center;
        box-shadow: 0 0 40px rgba(37, 99, 235, 0.5);
      }
      .core-label {
        color: #fff;
        font-size: 24px;
        font-weight: 900;
        letter-spacing: 2px;
      }
      .orbit-node {
        position: absolute;
        padding: 8px 16px;
        background: rgba(255, 255, 255, 0.95);
        color: var(--dark);
        border-radius: 999px;
        font-size: 13px;
        font-weight: 700;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
        white-space: nowrap;
      }
      .node-1 { top: 0; left: 50%; transform: translateX(-50%); }
      .node-2 { right: 0; top: 50%; transform: translateY(-50%); }
      .node-3 { bottom: 0; left: 50%; transform: translateX(-50%); }
      .node-4 { left: 0; top: 50%; transform: translateY(-50%); }

      /* 章节通用 */
      section { padding: 72px 0; }
      .section-head-center {
        text-align: center;
        margin-bottom: 40px;
      }
      .section-head-center .kicker {
        color: var(--blue); font-weight: 800; font-size: 13px;
        margin-bottom: 10px; letter-spacing: 1px;
      }
      .section-head-center .kicker.light { color: var(--gold); }
      .section-head-center h2 {
        font-size: 34px; margin: 0 0 12px; line-height: 1.2;
      }
      .section-head-center h2.light { color: #fff; }
      .section-head-center .section-desc {
        color: var(--muted); font-size: 15px; max-width: 560px; margin: 0 auto;
      }

      /* 服务卡片网格 */
      .service-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 18px;
      }
      .service-card {
        background: #fff;
        border: 1px solid var(--line);
        border-radius: 12px;
        padding: 28px 24px;
        box-shadow: var(--shadow-card);
        transition: transform 0.25s, box-shadow 0.25s;
        position: relative;
        overflow: hidden;
      }
      .service-card::before {
        content: "";
        position: absolute;
        top: 0; left: 0; right: 0;
        height: 3px;
        background: linear-gradient(90deg, var(--blue), var(--gold));
        transform: scaleX(0);
        transform-origin: left;
        transition: transform 0.3s;
      }
      .service-card:hover {
        transform: translateY(-6px);
        box-shadow: 0 20px 48px rgba(30, 64, 175, 0.12);
      }
      .service-card:hover::before { transform: scaleX(1); }
      .service-num {
        font-size: 13px;
        font-weight: 800;
        color: var(--blue);
        opacity: 0.5;
        margin-bottom: 8px;
      }
      .service-icon {
        font-size: 32px;
        margin-bottom: 14px;
      }
      .service-card h3 {
        font-size: 18px;
        margin: 0 0 10px;
      }
      .service-card p {
        color: #55677f;
        font-size: 14px;
        line-height: 1.65;
        margin: 0 0 14px;
      }
      .service-points {
        list-style: none;
        padding: 0;
        margin: 0;
        border-top: 1px solid var(--line);
        padding-top: 12px;
      }
      .service-points li {
        font-size: 13px;
        color: var(--muted);
        padding: 4px 0 4px 18px;
        position: relative;
      }
      .service-points li::before {
        content: "→";
        position: absolute;
        left: 0;
        color: var(--gold);
        font-weight: 700;
      }

      /* 深色 band */
      .band-dark {
        background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
        color: #fff;
      }

      /* 落地路径时间线 */
      .path-timeline {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
        position: relative;
      }
      .path-step {
        text-align: center;
        position: relative;
      }
      .step-num {
        width: 48px; height: 48px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--gold), #f59e0b);
        color: var(--dark);
        display: grid; place-items: center;
        font-size: 20px; font-weight: 900;
        margin: 0 auto 16px;
        box-shadow: 0 8px 24px rgba(251, 191, 36, 0.3);
      }
      .step-body h4 {
        color: #fff;
        font-size: 17px;
        margin: 0 0 8px;
      }
      .step-body p {
        color: #94a3b8;
        font-size: 13px;
        line-height: 1.6;
        margin: 0;
      }

      /* 适合 / 不适合 */
      .fit-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 18px;
      }
      .fit-card {
        border-radius: 12px;
        padding: 30px;
        border: 1px solid;
      }
      .fit-yes { background: #f0fdf4; border-color: #bbf7d0; }
      .fit-no { background: #fff7f7; border-color: #fecaca; }
      .fit-head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
      .fit-icon {
        width: 40px; height: 40px; border-radius: 50%;
        display: grid; place-items: center;
        font-size: 20px; font-weight: 900; color: #fff;
      }
      .fit-yes .fit-icon { background: var(--green); }
      .fit-no .fit-icon { background: var(--red); }
      .fit-head h3 { margin: 0; font-size: 22px; }
      .fit-head .sub { font-size: 13px; color: var(--muted); margin-top: 2px; }
      .fit-list { list-style: none; padding: 0; margin: 0; }
      .fit-list li {
        padding: 10px 0 10px 28px;
        position: relative;
        font-size: 15px;
        color: #3f5068;
        border-bottom: 1px dashed rgba(0,0,0,0.06);
      }
      .fit-list li:last-child { border-bottom: 0; }
      .fit-yes .fit-list li::before {
        content: "✓"; position: absolute; left: 0; top: 10px;
        color: var(--green); font-weight: 900;
      }
      .fit-no .fit-list li::before {
        content: "✕"; position: absolute; left: 0; top: 10px;
        color: var(--red); font-weight: 900;
      }

      /* CTA */
      .cta-enterprise {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 48px;
        align-items: center;
      }
      .cta-text .light { color: #fff; }
      .cta-text .light-muted { color: #94a3b8; font-size: 15px; line-height: 1.72; }
      .cta-text h2.light { font-size: 32px; margin-bottom: 14px; }
      .cta-form-enterprise {
        background: rgba(255,255,255,0.06);
        border: 1px solid rgba(255,255,255,0.12);
        border-radius: 12px;
        padding: 24px;
        backdrop-filter: blur(8px);
        display: flex;
        flex-direction: column;
        gap: 10px;
      }
      .cta-form-enterprise .field {
        background: rgba(255,255,255,0.08);
        border: 1px solid rgba(255,255,255,0.15);
        border-radius: 8px;
        padding: 12px 14px;
        color: #fff;
        font-size: 14px;
        font-family: inherit;
        width: 100%;
      }
      .cta-form-enterprise .field::placeholder { color: rgba(255,255,255,0.5); }
      .cta-form-enterprise .field option { color: #000; }
      .cta-form-enterprise .btn { width: 100%; margin-top: 4px; }
      .cta-note { font-size: 12px; color: rgba(148, 163, 184, 0.7); text-align: center; }

      /* 页脚 */
      .footer {
        background: #0d2a5f;
        color: #dbeafe;
        padding: 34px 0;
      }
      .footer-inner {
        display: flex; align-items: center; justify-content: space-between;
        gap: 30px;
      }
      .footer .brand-name { color: #fff; }
      .footer .brand-sub { color: #bfdbfe; }
      .footer-links { display: flex; gap: 22px; font-size: 13px; color: #bfdbfe; }
      .footer-links a:hover { color: #fff; }

      @media (max-width: 900px) {
        .container { width: min(100% - 32px, 1180px); }
        .nav-links { display: none; }
        .hero-enterprise h1 { font-size: 32px; }
        .hero-enterprise-grid { grid-template-columns: 1fr; }
        .hero-visual { min-height: 280px; }
        .orbit-ring { width: 260px; height: 260px; }
        .service-grid { grid-template-columns: 1fr 1fr; }
        .path-timeline { grid-template-columns: 1fr 1fr; }
        .fit-grid { grid-template-columns: 1fr; }
        .cta-enterprise { grid-template-columns: 1fr; }
        .footer-inner { flex-direction: column; align-items: flex-start; }
      }