/* roulang page: index */
:root {
      --deep-purple: #1A0B2E;
      --nebula-purple: #4B2A7A;
      --energy-orange: #FF6B35;
      --meteor-gold: #FBBF24;
      --white: #FFFFFF;
      --gray-light: #E5E7EB;
      --gray-mid: #9CA3AF;
      --gray-dark: #111827;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --card-hover-shadow: 0 16px 40px rgba(0,0,0,0.6);
      --border-radius-lg: 24px;
      --border-radius-md: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", "DIN", "Helvetica Neue", sans-serif;
      --transition: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-purple);
      color: var(--gray-light);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 30% 10%, var(--nebula-purple) 0%, transparent 35%),
                        radial-gradient(circle at 80% 70%, #2D1B4E 0%, transparent 40%);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 11, 46, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: var(--transition);
    }
    .nav.scrolled {
      background: rgba(15, 5, 30, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--white);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo i {
      color: var(--meteor-gold);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: var(--gray-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--energy-orange);
      transition: width 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--white);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--energy-orange), #FF8C42);
      color: var(--white);
      padding: 12px 28px;
      border-radius: var(--border-radius-md);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(255,107,53,0.4);
      letter-spacing: 0.3px;
      white-space: nowrap;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 6px 20px rgba(255,107,53,0.6);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--energy-orange);
      color: var(--energy-orange);
      padding: 11px 26px;
      border-radius: var(--border-radius-md);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      transition: var(--transition);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(255,107,53,0.1);
      border-color: #FF8C42;
      color: #FF8C42;
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.35;
      z-index: 0;
      mix-blend-mode: soft-light;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }
    .hero-text h1 span {
      background: linear-gradient(to right, var(--meteor-gold), var(--energy-orange));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: var(--gray-light);
      margin-bottom: 2.2rem;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-width: 100%;
      height: auto;
      border-radius: var(--border-radius-lg);
      box-shadow: 0 20px 50px rgba(0,0,0,0.6);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
      position: relative;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--gray-mid);
      font-size: 1.1rem;
      margin-bottom: 50px;
    }

    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .data-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(14px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--border-radius-lg);
      padding: 32px 20px;
      text-align: center;
      transition: var(--transition);
    }
    .data-card:hover {
      transform: translateY(-8px);
      background: rgba(255,255,255,0.07);
      box-shadow: 0 12px 30px rgba(0,0,0,0.5);
    }
    .data-number {
      font-family: var(--font-number);
      font-size: 3.2rem;
      font-weight: 800;
      background: linear-gradient(180deg, var(--meteor-gold) 0%, var(--energy-orange) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }
    .data-label {
      color: var(--gray-mid);
      font-size: 0.95rem;
    }

    /* 服务卡片 1大+2小 */
    .services-layout {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      grid-template-rows: auto auto;
      gap: 28px;
    }
    .service-card.large {
      grid-row: span 2;
    }
    .service-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.6);
      background: rgba(255,255,255,0.08);
    }
    .service-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 16px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.6rem;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--gray-light);
      margin-bottom: 16px;
      flex: 1;
    }
    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 12px;
    }
    .tag {
      background: rgba(255,107,53,0.15);
      color: var(--energy-orange);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    .service-link {
      color: var(--meteor-gold);
      text-decoration: none;
      font-weight: 500;
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 案例对比 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .case-card {
      background: rgba(20,15,35,0.8);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius-lg);
      padding: 28px;
      border: 1px solid rgba(255,255,255,0.05);
    }
    .case-before {
      background: rgba(60,60,70,0.25);
    }
    .case-after {
      background: rgba(255,107,53,0.08);
      border-color: rgba(255,107,53,0.3);
    }
    .case-label {
      font-weight: 700;
      font-size: 0.9rem;
      text-transform: uppercase;
      margin-bottom: 12px;
    }
    .case-before .case-label { color: var(--gray-mid); }
    .case-after .case-label { color: var(--energy-orange); }
    .case-title {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--white);
      margin-bottom: 8px;
    }
    .case-desc {
      color: var(--gray-light);
      margin-bottom: 16px;
    }
    .case-result {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--meteor-gold);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 16px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: var(--white);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 22px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      text-align: left;
    }
    .faq-answer {
      padding: 0 24px 22px;
      color: var(--gray-mid);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #2D1B4E, #1A0B2E);
      border-radius: var(--border-radius-lg);
      padding: 60px 40px;
      text-align: center;
      margin: 40px 0;
    }
    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      margin-top: 32px;
    }
    .cta-form input {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.15);
      padding: 14px 18px;
      border-radius: 12px;
      color: white;
      width: 220px;
      transition: 0.2s;
    }
    .cta-form input:focus {
      outline: none;
      border-color: var(--energy-orange);
      box-shadow: 0 0 0 3px rgba(255,107,53,0.3);
    }

    /* Footer */
    .footer {
      background: #0F051E;
      padding: 60px 0 30px;
      margin-top: 60px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer a {
      color: var(--gray-mid);
      text-decoration: none;
      display: block;
      margin-bottom: 8px;
    }
    .back-top {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background: var(--energy-orange);
      color: white;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 999;
    }

    @media (max-width: 1024px) {
      .hero-content { grid-template-columns: 1fr; text-align: center; }
      .hero-text p { max-width: 100%; }
      .data-grid { grid-template-columns: repeat(2,1fr); }
      .services-layout { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .footer-grid { grid-template-columns: 1fr; }
    }