/* roulang page: index */
:root {
      --deep-space: #1A1F36;
      --deep-space-light: #252B45;
      --starlight-gold: #C9A96E;
      --starlight-gold-dark: #B8944F;
      --nebula-purple: #6B5B95;
      --warm-white: #FAF9F7;
      --card-bg: #FFFFFF;
      --text-body: #3A3D48;
      --text-secondary: #6F7380;
      --border-soft: #E8E6E1;
      --disabled: #B0B3BC;
      --shadow-card: 0 1px 3px rgba(26,31,54,0.06), 0 4px 16px rgba(26,31,54,0.04);
      --shadow-card-hover: 0 2px 6px rgba(26,31,54,0.1), 0 8px 24px rgba(26,31,54,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-body);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3 {
      font-family: var(--font-serif);
    }

    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250, 249, 247, 0.9);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 6px rgba(0,0,0,0.02);
      z-index: 50;
      display: flex;
      align-items: center;
      transition: background 0.3s ease;
    }
    .navbar.scrolled {
      background: rgba(250, 249, 247, 0.95);
    }
    .nav-inner {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo-text {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--deep-space);
      text-decoration: none;
    }
    .logo-text span {
      color: var(--starlight-gold);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }
    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--deep-space);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--starlight-gold);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--starlight-gold);
      color: #1A1F36 !important;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.2s;
      margin-left: 1.2rem;
    }
    .btn-nav:hover {
      background: var(--starlight-gold-dark);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--deep-space);
      border-radius: 2px;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(250,249,247,0.98);
      backdrop-filter: blur(16px);
      flex-direction: column;
      padding: 2rem 2rem;
      gap: 2rem;
      z-index: 40;
      transform: translateY(-10px);
      opacity: 0;
      transition: 0.25s ease;
    }
    .mobile-menu.open {
      display: flex;
      transform: translateY(0);
      opacity: 1;
    }

    /* Hero 星空粒子 */
    .hero-bg {
      background: linear-gradient(135deg, #1A1F36 0%, #252B45 100%);
      position: relative;
      overflow: hidden;
    }
    .star-particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.5;
      animation: float 8s infinite alternate ease-in-out;
    }
    @keyframes float {
      0% { transform: translateY(0px); opacity: 0.4; }
      100% { transform: translateY(-15px); opacity: 0.8; }
    }

    /* 数字动画 */
    .counter-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--starlight-gold);
      line-height: 1.2;
    }

    /* 证言引号 */
    .quote-mark {
      font-size: 5rem;
      color: var(--nebula-purple);
      opacity: 0.2;
      position: absolute;
      top: -10px;
      left: 20px;
      line-height: 1;
      font-family: var(--font-serif);
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 1.4rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: var(--font-serif);
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--deep-space);
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
      color: var(--text-body);
      padding: 0 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    .faq-icon {
      font-size: 1.8rem;
      color: var(--starlight-gold);
      transition: transform 0.3s;
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.4rem;
      }
    }
    @media (max-width: 768px) {
      .navbar {
        height: 64px;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .btn-nav {
        display: none;
      }
      .mobile-menu a {
        font-size: 1.3rem;
      }
    }