/* roulang page: index */
/* 设计变量与重置 */
    :root {
      --deep-space: #0B1A2E;
      --starlight-silver: #C8D6E5;
      --dawn-gold: #D4A853;
      --dawn-gold-hover: #B8913E;
      --bg-light: #F8F9FB;
      --card-bg: #FFFFFF;
      --border-light: #E5E9F0;
      --text-muted: #6B7B8D;
      --text-dark: #1A2A3A;
      --shadow-sm: 0 4px 20px rgba(11,26,46,0.04);
      --shadow-hover: 0 8px 30px rgba(11,26,46,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    input {
      font-family: var(--font-body);
      border-radius: 6px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(11,26,46,0.05);
      transition: box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 12px rgba(11,26,46,0.06);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 20px;
      font-weight: 700;
      color: var(--deep-space);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      color: var(--dawn-gold);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--deep-space);
      position: relative;
      padding: 4px 0;
      transition: color 0.3s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--dawn-gold);
      transition: width 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--dawn-gold);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--deep-space);
    }

    /* 汉堡全屏面板 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--deep-space);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 50;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 22px;
      color: var(--starlight-silver);
      font-weight: 600;
    }

    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: #fff;
      font-size: 28px;
    }

    /* 通用板块间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 1024px) {
      section {
        padding: 64px 0;
      }
    }

    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
      .header-inner {
        height: 64px;
      }
    }

    /* 按钮样式 */
    .btn-primary {
      background: var(--dawn-gold);
      color: #fff;
      padding: 14px 36px;
      font-size: 16px;
      border: none;
      box-shadow: 0 4px 18px rgba(212,168,83,0.3);
      animation: breathe 2.2s infinite ease-in-out;
    }

    .btn-primary:hover {
      background: var(--dawn-gold-hover);
      box-shadow: 0 0 20px rgba(212,168,83,0.5);
    }

    @keyframes breathe {
      0% { box-shadow: 0 0 12px rgba(212,168,83,0.25); }
      50% { box-shadow: 0 0 24px rgba(212,168,83,0.45); }
      100% { box-shadow: 0 0 12px rgba(212,168,83,0.25); }
    }

    .btn-outline {
      border: 1px solid var(--starlight-silver);
      background: transparent;
      color: var(--deep-space);
      padding: 12px 28px;
    }

    .btn-outline:hover {
      border-color: var(--dawn-gold);
      background: rgba(212,168,83,0.06);
      color: var(--dawn-gold);
    }

    /* Hero */
    #home {
      background: var(--deep-space);
      position: relative;
      overflow: hidden;
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.24;
      mix-blend-mode: overlay;
    }

    .starfield {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(200,214,229,0.08) 1px, transparent 1px),
                  radial-gradient(circle at 70% 80%, rgba(212,168,83,0.1) 1px, transparent 1px);
      background-size: 180px 180px, 220px 220px;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero-content h1 {
      font-size: clamp(36px, 7vw, 56px);
      color: #fff;
      line-height: 1.2;
      margin-bottom: 24px;
      font-weight: 700;
    }

    .hero-content p {
      font-size: 1.25rem;
      color: var(--starlight-silver);
      margin-bottom: 40px;
      font-weight: 300;
    }

    /* 板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      color: var(--deep-space);
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .card i {
      font-size: 2rem;
      color: var(--dawn-gold);
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    .feature-list {
      list-style: none;
      margin-top: 16px;
    }
    .feature-list li {
      padding: 6px 0;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .feature-list li::before {
      content: "—";
      color: var(--dawn-gold);
    }

    /* 成果数字 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-item .number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--dawn-gold);
      font-family: var(--font-number);
    }

    /* 证言 */
    .testimonial-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 28px;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      font-size: 18px;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA 深色区 */
    #cta {
      background: var(--deep-space);
      text-align: center;
      color: #fff;
    }

    /* 页脚 */
    .site-footer {
      background: var(--deep-space);
      color: var(--starlight-silver);
      padding: 60px 0 30px;
    }

    @media (max-width: 768px) {
      .card-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
    }