/* roulang page: index */
:root {
      --primary-deep: #0B2B26;
      --accent-green: #00E5A1;
      --bg-light: #F4F6F9;
      --bg-secondary: #E8EDF2;
      --cta-red: #FF3C38;
      --text-dark: #1A1F24;
      --text-muted: #5C6B7A;
      --glass-bg: rgba(255,255,255,0.72);
      --glass-border: rgba(11,43,38,0.12);
      --card-shadow: 0 4px 20px rgba(11,43,38,0.06), 0 1px 3px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 12px 32px rgba(11,43,38,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --transition-smooth: 0.2s ease-out;
      --font-heading: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'SF Pro Text', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      line-height: 1.7;
      color: var(--text-dark);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      padding-top: 80px;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航栏透明玻璃沉浸式 */
    .custom-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(244,246,249,0.78);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(11,43,38,0.08);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 0.75rem 0;
    }

    .custom-nav.scrolled {
      background: rgba(244,246,249,0.98);
      box-shadow: 0 4px 24px rgba(0,0,0,0.06);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      text-decoration: none;
      color: var(--primary-deep);
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      fill: var(--primary-deep);
    }

    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-green);
    }

    .nav-links a.active {
      color: var(--accent-green);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-green);
      border-radius: 2px;
    }

    .btn-nav-cta {
      background: var(--cta-red);
      color: white !important;
      padding: 0.5rem 1.3rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: transform 0.2s, filter 0.2s;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }

    .btn-nav-cta:hover {
      transform: scale(1.03);
      filter: brightness(1.08);
      color: white;
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 移动端导航面板 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(244,246,249,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 999;
    }

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

    .mobile-menu a {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--primary-deep);
      text-decoration: none;
    }

    /* 按钮组件 */
    .btn-primary-custom {
      background: var(--cta-red);
      color: white;
      border: none;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      display: inline-block;
      transition: transform 0.2s, filter 0.2s;
      cursor: pointer;
    }

    .btn-primary-custom:hover {
      transform: scale(1.03);
      filter: brightness(1.08);
      color: white;
      text-decoration: none;
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 0.7rem 1.9rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: all 0.2s;
    }

    .btn-outline-custom:hover {
      background: var(--primary-deep);
      color: white;
    }

    .card-custom {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: transform 0.2s, box-shadow 0.2s;
    }

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

    .glass-panel {
      background: var(--glass-bg);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
    }

    .section-padding {
      padding: 5rem 0;
    }

    @media (min-width: 640px) {
      .section-padding {
        padding: 8rem 0;
      }
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      font-size: 2rem;
      font-weight: 650;
      color: var(--primary-deep);
    }

    .section-title p {
      color: var(--text-muted);
      max-width: 640px;
      margin: 0.5rem auto 0;
    }

    /* Hero 区域 */
    .hero-bg {
      background: var(--bg-light);
      position: relative;
      overflow: hidden;
    }

    .wave-svg {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      opacity: 0.08;
      z-index: 0;
    }

    .lens-flare {
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,229,161,0.08) 0%, transparent 70%);
      filter: blur(120px);
      z-index: 0;
    }

    .hero-image-container {
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      border-radius: 16px;
      border: 1px solid rgba(11,43,38,0.1);
      overflow: hidden;
      position: relative;
    }

    /* 图标容器 */
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(0,229,161,0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.2rem;
      transition: background 0.2s;
    }

    .card-custom:hover .icon-circle {
      background: rgba(0,229,161,0.16);
    }

    /* 输入框 */
    .input-custom {
      border-radius: 8px;
      border: 1px solid #D0D7DE;
      padding: 0.75rem 1rem;
      font-size: 1rem;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .input-custom:focus {
      border-color: var(--accent-green);
      box-shadow: 0 0 0 3px rgba(0,229,161,0.15);
      outline: none;
    }

    .footer-wave {
      height: 20px;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 30" preserveAspectRatio="none"><path d="M0,15 C300,0 600,30 900,15 C1050,7.5 1150,22.5 1200,15 L1200,30 L0,30 Z" fill="%2300E5A1" opacity="0.2"/></svg>') repeat-x;
      background-size: cover;
    }

    @media (max-width: 639px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .logo-text { font-size: 1.2rem; }
      h1 { font-size: 2.4rem !important; }
      h2 { font-size: 2rem !important; }
    }