/* roulang page: index */
:root {
      --deep-space: #1A1D24;
      --stardust-purple: #6C5CE7;
      --warm-gold: #F0C060;
      --body-bg: #F8F9FC;
      --dark-block: #13161C;
      --text-primary: #1E2330;
      --text-secondary: #5A6170;
      --text-muted: #8A94A6;
      --white: #FFFFFF;
      --card-bg: #FFFFFF;
      --border-light: #E9ECF2;
      --shadow-card: 0 2px 16px rgba(26,29,36,0.06);
      --shadow-hover: 0 8px 30px rgba(108,92,231,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-inter: "Inter", -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.02em;
    }

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

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航栏 */
    .navbar-custom {
      background: var(--deep-space);
      height: 72px;
      padding: 0 1.5rem;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      display: flex;
      align-items: center;
    }
    .logo-text {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo-text i {
      color: var(--warm-gold);
      margin-right: 6px;
      font-size: 1.2rem;
    }
    .nav-chips {
      display: flex;
      gap: 0.25rem;
      align-items: center;
    }
    .nav-chip {
      background: transparent;
      color: #B0B8C5;
      padding: 0.35rem 1rem;
      border-radius: var(--radius-chip);
      font-size: 0.9rem;
      font-weight: 500;
      transition: all 0.25s ease;
      position: relative;
      border: none;
      white-space: nowrap;
    }
    .nav-chip:hover {
      color: white;
      background: rgba(255,255,255,0.08);
    }
    .nav-chip.active {
      color: white;
      font-weight: 600;
      background: transparent;
    }
    .nav-chip.active::after {
      content: '';
      position: absolute;
      bottom: 2px;
      left: 50%;
      transform: translateX(-50%);
      width: 24px;
      height: 3px;
      background: var(--stardust-purple);
      border-radius: 4px;
    }
    .cta-btn-nav {
      background: var(--warm-gold);
      color: var(--deep-space);
      font-weight: 700;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      transition: 0.3s ease;
      border: none;
      font-size: 0.9rem;
      white-space: nowrap;
      letter-spacing: 0.3px;
    }
    .cta-btn-nav:hover {
      background: #f5d080;
      color: #0f1115;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(240,192,96,0.25);
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.85)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }

    @media (max-width: 991px) {
      .navbar-collapse {
        background: var(--deep-space);
        padding: 1.5rem;
        border-radius: 0 0 16px 16px;
        margin-top: 12px;
      }
      .nav-chips {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      scroll-margin-top: 72px;
    }
    .section-dark {
      background: var(--dark-block);
      color: white;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      max-width: 600px;
    }

    /* hero */
    #hero {
      background: linear-gradient(135deg, #1A1D24 0%, #13161C 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-pattern {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 30%, rgba(108,92,231,0.15) 0%, transparent 35%);
      pointer-events: none;
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
    }
    .hero-highlight {
      color: var(--warm-gold);
    }
    .hero-desc {
      font-size: 1.2rem;
      color: #8A94A6;
      max-width: 500px;
      margin: 1.5rem 0 2rem;
    }
    .btn-primary-gold {
      background: var(--warm-gold);
      color: #1A1D24;
      font-weight: 700;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      border: none;
      transition: 0.3s;
    }
    .btn-primary-gold:hover {
      background: #f5d080;
      transform: translateY(-2px);
      box-shadow: 0 10px 22px rgba(240,192,96,0.3);
    }
    .btn-outline-light {
      border: 1.5px solid white;
      color: white;
      background: transparent;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline-light:hover {
      background: white;
      color: #1A1D24;
      border-color: white;
    }

    /* 痛点卡片 */
    .pain-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--stardust-purple);
      transition: 0.3s;
      height: 100%;
    }
    .pain-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      color: var(--stardust-purple);
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    /* 方案模块 */
    .solution-block {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .solution-img {
      width: 45%;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      object-fit: cover;
    }
    .solution-text {
      width: 50%;
    }
    .solution-num {
      font-family: var(--font-inter);
      font-size: 4rem;
      font-weight: 700;
      color: rgba(108,92,231,0.15);
      line-height: 1;
    }

    /* 数据指标 */
    .metric-number {
      font-family: var(--font-inter);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--warm-gold);
    }

    /* 证言 */
    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 4rem;
      color: rgba(108,92,231,0.25);
      position: absolute;
      top: 0;
      left: 20px;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--stardust-purple);
      font-weight: 600;
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--border-light);
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
    }

    /* 终局CTA */
    .cta-final {
      background: #13161C;
      padding: 80px 0;
    }

    footer {
      background: #1A1D24;
      color: #8A94A6;
      padding: 3rem 0;
    }
    .footer-brand {
      color: white;
      font-weight: 700;
    }
    .social-icon {
      color: #8A94A6;
      font-size: 1.3rem;
      margin-right: 1rem;
      transition: 0.2s;
    }
    .social-icon:hover {
      color: var(--warm-gold);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .solution-block {
        flex-direction: column;
      }
      .solution-img, .solution-text {
        width: 100%;
      }
    }