/* roulang page: index */
:root {
      --primary-bg: #0A0E27;
      --accent-red: #FF4D2E;
      --accent-cyan: #1EE0B6;
      --neutral-light: #F4F6FC;
      --neutral-mid: #8E94A4;
      --text-dark: #1E2330;
      --text-soft: #4A4F5C;
      --white: #FFFFFF;
      --card-shadow: 0 8px 24px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 18px 36px rgba(0,0,0,0.12);
      --border-radius-lg: 20px;
      --border-radius-md: 16px;
      --border-radius-sm: 12px;
      --transition: all 0.25s ease;
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --container-max: 1280px;
      --section-gap: 100px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-soft);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    button, input {
      font-family: inherit;
    }

    /* 导航栏 - 暗色霓虹风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10, 14, 39, 0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .logo .brand {
      background: linear-gradient(135deg, #FF4D2E, #FF7A45);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo .sub {
      color: #8E94A4;
      font-size: 1rem;
      font-weight: 500;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      color: #B0B8C8;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-menu a:hover {
      color: #FFFFFF;
    }

    .nav-menu a.active {
      color: #FFFFFF;
    }

    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 3px;
      background: #FF4D2E;
      box-shadow: 0 0 12px #FF4D2E;
      border-radius: 2px;
    }

    .nav-cta {
      background: linear-gradient(135deg, #FF4D2E 0%, #FF7A45 100%);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: 30px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(255, 77, 46, 0.4);
      transition: all 0.2s;
    }

    .nav-cta:hover {
      box-shadow: 0 0 18px rgba(255, 77, 46, 0.7);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.2s;
    }

    /* Hero 双栏 */
    .hero {
      background-color: var(--primary-bg);
      background-image: radial-gradient(circle at 30% 30%, rgba(30, 224, 182, 0.05) 0%, transparent 40%);
      padding: 140px 0 100px;
      margin-top: 0;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 3.6rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: white;
      margin-bottom: 24px;
    }

    .hero-left h1 .highlight {
      background: linear-gradient(135deg, #FF4D2E, #FF7A45);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #B0B8C8;
      margin-bottom: 32px;
      max-width: 480px;
    }

    .badge-row {
      display: flex;
      gap: 32px;
      margin-bottom: 36px;
    }

    .stat-badge {
      background: rgba(255,255,255,0.06);
      border-radius: 20px;
      padding: 8px 20px;
      backdrop-filter: blur(4px);
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: #1EE0B6;
      text-shadow: 0 0 8px rgba(30,224,182,0.5);
    }

    .stat-label {
      font-size: 0.8rem;
      color: #8E94A4;
      text-transform: uppercase;
    }

    .btn-primary {
      background: linear-gradient(135deg, #FF4D2E 0%, #FF7A45 100%);
      color: white;
      border: none;
      padding: 15px 38px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: 0.2s;
      box-shadow: 0 6px 18px rgba(255, 77, 46, 0.4);
    }

    .btn-primary:hover {
      box-shadow: 0 0 22px rgba(255, 77, 46, 0.8);
      filter: brightness(1.08);
    }

    .hero-right {
      position: relative;
    }

    .dashboard-mock {
      background: rgba(20, 25, 50, 0.8);
      backdrop-filter: blur(8px);
      border-radius: 28px;
      padding: 20px;
      box-shadow: 0 30px 50px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
    }

    .dashboard-mock img {
      border-radius: 16px;
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: #0A0E27;
      margin-bottom: 48px;
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .section-title::before {
      content: '';
      display: inline-block;
      width: 6px;
      height: 40px;
      background: #FF4D2E;
      border-radius: 4px;
    }

    /* 亮点网格 */
    .features {
      padding: var(--section-gap) 0;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: white;
      padding: 32px;
      border-radius: var(--border-radius-md);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-hover-shadow);
      border-image: linear-gradient(135deg, #1EE0B6, #FF4D2E) 1;
      border-radius: 16px;
    }

    .icon-box {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg, #FF4D2E20, #FF7A4520);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
      color: #FF4D2E;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 650;
      color: #0A0E27;
      margin-bottom: 12px;
    }

    .metric {
      margin-top: 16px;
      font-weight: 700;
      color: #1EE0B6;
    }

    /* 案例瀑布流 */
    .cases {
      padding: var(--section-gap) 0;
      background: #F9FAFC;
    }

    .masonry {
      columns: 3;
      column-gap: 28px;
    }

    .case-card {
      background: white;
      border-radius: 18px;
      overflow: hidden;
      margin-bottom: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      break-inside: avoid;
    }

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

    .case-img img {
      border-radius: 18px 18px 0 0;
      object-fit: cover;
    }

    .case-tag {
      background: #F4F6FC;
      color: #0A0E27;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin: 20px 20px 10px;
    }

    .case-card h3 {
      margin: 0 20px 10px;
    }

    .case-card p {
      margin: 0 20px 20px;
      color: #4A4F5C;
    }

    /* 方案对比 */
    .plans {
      padding: var(--section-gap) 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .plan-card {
      background: white;
      padding: 36px 28px;
      border-radius: 20px;
      box-shadow: var(--card-shadow);
      text-align: center;
    }

    .plan-card.featured {
      border: 2px solid transparent;
      background-clip: padding-box;
      position: relative;
      box-shadow: 0 0 0 2px #FF4D2E;
    }

    .plan-name {
      font-weight: 700;
      font-size: 1.4rem;
    }

    .plan-list {
      list-style: none;
      text-align: left;
      margin: 24px 0;
    }

    .plan-list li::before {
      content: '✓';
      color: #1EE0B6;
      margin-right: 8px;
    }

    /* FAQ */
    .faq {
      padding: var(--section-gap) 0;
    }

    .accordion-item {
      border-bottom: 1px solid #e0e4ea;
    }

    .accordion-btn {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-size: 1.1rem;
      font-weight: 600;
      padding: 22px 0;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F4F6FC;
      border-radius: 12px;
      padding: 0 18px;
    }

    .accordion-content.open {
      max-height: 200px;
      padding: 18px;
    }

    /* CTA */
    .cta-section {
      background: #0A0E27;
      padding: 80px 0;
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .cta-form input {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border-radius: 30px;
      border: none;
      background: #1E2330;
      color: white;
    }

    .footer {
      background: #060918;
      color: #8E94A4;
      padding: 50px 0;
    }

    @media (max-width: 1024px) {
      .hero-grid, .cta-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .grid-3, .compare-grid { grid-template-columns: 1fr; }
      .masonry { columns: 1; }
      .hero-left h1 { font-size: 2.4rem; }
    }