/* roulang page: index */
:root {
      --primary: #E43D2A;
      --primary-light: #FF6B4A;
      --primary-soft: rgba(228, 61, 42, 0.08);
      --secondary-dark: #1A1A2E;
      --secondary-light: #F5F0E8;
      --accent-gold: #FFB800;
      --safe-green: #0FA87A;
      --text-main: #1E1E2A;
      --text-secondary: #6B6B7B;
      --text-on-dark: #E8E8F0;
      --border-light: #E0DCD5;
      --card-bg: #FFFFFF;
      --card-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
      --card-shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 40px;
      --transition: 0.25s ease;
      --max-width: 1200px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      background-color: #FDFBF7;
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      font-weight: 600;
      outline: none;
    }

    button:focus-visible, .btn:focus-visible, a:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 3px;
      border-radius: 4px;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 PC */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: rgba(26, 26, 46, 0.92);
      backdrop-filter: blur(8px);
      display: flex;
      align-items: center;
      z-index: 100;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 0 24px;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
    }

    .logo {
      font-size: 1.7rem;
      font-weight: 700;
      letter-spacing: -0.3px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 12px;
      align-items: center;
    }
    .nav-link {
      color: #ccccdd;
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      background: rgba(255,255,255,0.12);
      color: white;
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: #c42f1f;
      transform: translateY(-2px);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(26, 26, 46, 0.96);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255,255,255,0.1);
      z-index: 110;
      padding-bottom: env(safe-area-inset-bottom);
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #aaa;
      font-size: 0.7rem;
      gap: 4px;
    }
    .mobile-nav-center {
      background: var(--primary);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -18px;
      box-shadow: 0 6px 16px rgba(228,61,42,0.5);
      color: white;
      font-size: 1.5rem;
    }

    /* Hero */
    .hero {
      background: radial-gradient(circle at 30% 30%, #2a2a40, var(--secondary-dark));
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-particles {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      pointer-events: none;
    }
    .particle {
      position: absolute;
      background: rgba(255,184,0,0.25);
      border-radius: 50%;
      width: 8px; height: 8px;
      animation: float 12s infinite;
    }
    @keyframes float {
      0% { transform: translateY(0) scale(1); opacity: 0.6; }
      50% { transform: translateY(-30px) scale(1.3); opacity: 0.3; }
      100% { transform: translateY(0) scale(1); opacity: 0.6; }
    }
    .hero-grid {
      display: flex;
      gap: 50px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 5vw, 3.4rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #E43D2A, #FF8A6A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #cfcfdd;
      margin: 20px 0 32px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
    }
    .btn-primary:hover { background: #c42f1f; transform: translateY(-2px); }
    .btn-outline:hover { background: rgba(228,61,42,0.15); }
    .mockup-card {
      background: rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 8px;
      transform: rotate(5deg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.15);
      backdrop-filter: blur(4px);
    }
    .mockup-card img {
      border-radius: 18px;
      width: 100%;
    }

    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 48px;
      color: var(--secondary-dark);
    }

    /* 亮点网格 2-3-1 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--secondary-light);
      border-radius: var(--radius-card);
      padding: 28px;
      border-left: 5px solid var(--primary);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border-left-width: 8px;
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .wide-feature {
      grid-column: span 2;
      background: white;
      border-left: 5px solid var(--accent-gold);
    }

    /* 案例瀑布 */
    .waterfall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
    }
    .case-img {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16/10;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: 0.4s ease;
    }
    .case-card:hover .case-img img {
      transform: scale(1.06);
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(228,61,42,0.7), transparent);
      display: flex;
      align-items: flex-end;
      padding: 16px;
      opacity: 0;
      transition: 0.3s;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-info {
      padding: 18px;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 20px;
      text-align: center;
      border: 1px solid var(--border-light);
    }
    .plan-highlight {
      border: 2px solid var(--primary);
      box-shadow: 0 0 0 4px rgba(228,61,42,0.15);
    }

    /* FAQ */
    .faq-item {
      background: var(--secondary-light);
      border-radius: 12px;
      margin-bottom: 12px;
    }
    .faq-question {
      padding: 22px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #ede6db;
      padding: 0 24px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }

    /* CTA 条 */
    .cta-band {
      background: var(--secondary-dark);
      color: white;
      text-align: center;
      padding: 80px 20px;
    }

    /* Footer */
    .footer {
      background: #141428;
      color: #b0b0c8;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav { display: none; }
      .mobile-bottom-nav { display: flex; }
      .hero { padding: 100px 0 60px; }
      .features-grid { grid-template-columns: 1fr; }
      .wide-feature { grid-column: span 1; }
      .waterfall { grid-template-columns: 1fr; }
      .compare-table { grid-template-columns: 1fr; overflow-x: auto; display: flex; }
      .plan-card { min-width: 220px; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn-group { flex-direction: column; }
    }