/* roulang page: index */
:root {
      --deep-space: #1A1F36;
      --warm-gold: #C5A86B;
      --warm-gold-hover: #B08D4A;
      --paper-white: #F7F5F0;
      --pine-green: #3E5C4A;
      --text-primary: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-on-dark: #FFFFFF;
      --border-warm: #E5E0D8;
      --card-bg: #FFFFFF;
      --shadow-light: 0 4px 20px rgba(26, 31, 54, 0.06);
      --shadow-hover: 0 12px 32px rgba(26, 31, 54, 0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'Noto Sans SC', 'Inter', sans-serif;
      --font-mono: 'DM Mono', 'JetBrains Mono', monospace;
      --max-width: 1280px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--paper-white);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: var(--deep-space);
      z-index: 1000;
      display: flex;
      align-items: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 22px;
      color: var(--warm-gold);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      position: relative;
    }
    .logo-icon::before {
      content: "";
      position: absolute;
      width: 24px;
      height: 24px;
      border: 2px solid var(--warm-gold);
      border-radius: 50%;
      top: 2px;
      left: 2px;
      opacity: 0.8;
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      width: 8px;
      height: 8px;
      background: var(--warm-gold);
      border-radius: 50%;
      top: 10px;
      left: 10px;
      box-shadow: 0 0 6px var(--warm-gold);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--paper-white);
      font-weight: 500;
      font-size: 16px;
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--warm-gold);
    }
    .mega-trigger {
      position: relative;
    }
    .mega-panel {
      position: absolute;
      top: 48px;
      right: 0;
      width: 480px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: 0 20px 48px rgba(0,0,0,0.12);
      padding: 32px;
      display: none;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      z-index: 1001;
      border: 1px solid var(--border-warm);
    }
    .mega-trigger:hover .mega-panel {
      display: grid;
    }
    .mega-col h4 {
      font-family: var(--font-serif);
      color: var(--deep-space);
      margin-bottom: 16px;
      font-size: 18px;
      border-bottom: 1px solid var(--border-warm);
      padding-bottom: 8px;
    }
    .mega-col a {
      display: block;
      padding: 8px 0;
      color: var(--text-secondary);
      font-size: 15px;
    }
    .mega-col a:hover {
      color: var(--pine-green);
    }
    .header-contact {
      background: var(--warm-gold);
      color: var(--deep-space);
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      margin-left: 16px;
      transition: background var(--transition);
    }
    .header-contact:hover {
      background: var(--warm-gold-hover);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--paper-white);
      border-radius: 2px;
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .header-contact {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      background: var(--deep-space);
      padding: 120px 0 80px;
      margin-top: var(--header-height);
      position: relative;
      overflow: hidden;
      color: var(--text-on-dark);
    }
    .stars {
      position: absolute;
      width: 100%;
      height: 100%;
      top:0; left:0;
      pointer-events: none;
    }
    .star {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.7;
      animation: twinkle 3s infinite alternate;
    }
    @keyframes twinkle {
      0% { opacity: 0.4; transform: scale(0.8); }
      100% { opacity: 0.9; transform: scale(1.1); }
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 60%;
    }
    .hero-text h1 {
      font-family: var(--font-serif);
      font-size: 48px;
      line-height: 1.25;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--warm-gold);
      color: var(--deep-space);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      transition: background var(--transition), transform var(--transition);
    }
    .btn-primary:hover {
      background: var(--warm-gold-hover);
      transform: translateY(-2px);
    }
    .btn-outline-light {
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: 0.25s;
    }
    .btn-outline-light:hover {
      background: white;
      color: var(--deep-space);
    }
    .hero-visual {
      flex: 1 1 40%;
      position: relative;
    }
    .hero-visual img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 36px;
      }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    @media (max-width: 767px) {
      .section {
        padding: 60px 0;
      }
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--deep-space);
    }
    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 18px;
    }

    /* 痛点 */
    .pain-grid {
      display: flex;
      gap: 48px;
      align-items: center;
    }
    .pain-text .item {
      margin-bottom: 28px;
      padding-left: 20px;
      border-left: 4px solid var(--pine-green);
    }
    .pain-image img {
      border-radius: var(--radius-card);
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-content h3 {
      font-family: var(--font-serif);
      font-size: 28px;
      margin-bottom: 16px;
    }
    .btn-outline {
      border: 2px solid var(--deep-space);
      color: var(--deep-space);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: var(--deep-space);
      color: white;
    }

    /* 数据卡 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-light);
      border: 1px solid var(--border-warm);
      position: relative;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      color: var(--pine-green);
      font-weight: 500;
    }
    .stat-desc {
      color: var(--text-secondary);
      margin-top: 8px;
    }
    .stat-bar {
      width: 40px;
      height: 3px;
      background: var(--pine-green);
      margin: 16px auto 0;
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      border-left: 4px solid var(--pine-green);
      box-shadow: var(--shadow-light);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .testimonial-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .quote {
      font-style: italic;
      margin-bottom: 20px;
    }
    .author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }
    .step {
      text-align: center;
      flex:1;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--warm-gold);
      color: var(--deep-space);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 24px;
      margin: 0 auto 16px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-warm);
      padding: 20px 0;
    }
    .faq-question {
      font-family: var(--font-serif);
      font-size: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }

    /* CTA */
    .cta-dark {
      background: var(--deep-space);
      text-align: center;
      padding: 100px 0;
      color: white;
    }
    .cta-dark h2 {
      font-family: var(--font-serif);
      font-size: 40px;
    }
    .footer {
      background: var(--deep-space);
      color: #A0A5B5;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .stats-grid, .testimonials-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .steps { flex-direction: column; gap: 24px; }
    }
    @media (max-width: 520px) {
      .stats-grid, .testimonials-grid { grid-template-columns: 1fr; }
    }