/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-orange: #FF6B35;
      --deep-blue: #0F0F1A;
      --accent-cyan: #00E5FF;
      --warm-white: #F8F7FC;
      --card-bg: #FFFFFF;
      --text-main: #1E1E2A;
      --text-muted: #5A5A72;
      --border-light: rgba(123, 47, 247, 0.15);
      --shadow-card: 0 8px 28px rgba(123, 47, 247, 0.08);
      --shadow-hover: 0 16px 40px rgba(123, 47, 247, 0.15);
      --radius-xl: 28px;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", sans-serif;
      --transition-smooth: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 1.5rem;
      }
      html {
        font-size: 15px;
      }
    }
    @media (max-width: 480px) {
      .container {
        padding: 0 1.2rem;
      }
      html {
        font-size: 14px;
      }
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.01em;
      line-height: 1.25;
    }
    h1 {
      font-size: 3.2rem;
      font-weight: 800;
      letter-spacing: -0.02em;
    }
    h2 {
      font-size: 2.4rem;
      margin-bottom: 1.2rem;
    }
    h3 {
      font-size: 1.6rem;
      font-weight: 600;
    }
    p {
      color: var(--text-muted);
      line-height: 1.8;
      max-width: 68ch;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 700;
      border: none;
      outline: none;
      transition: var(--transition-smooth);
    }
    .btn-primary {
      background: var(--primary-orange);
      color: white;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-md);
      font-size: 1.1rem;
      box-shadow: 0 8px 18px rgba(255, 107, 53, 0.25);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }
    .btn-primary:hover {
      background: #E55A2B;
      box-shadow: 0 12px 24px rgba(255, 107, 53, 0.35);
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary-purple);
      color: var(--primary-purple);
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-md);
      font-size: 1.1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }
    .btn-secondary:hover {
      background: rgba(123, 47, 247, 0.08);
      color: #6A1FDF;
      border-color: #6A1FDF;
    }
    .btn-large {
      padding: 1.1rem 3rem;
      font-size: 1.25rem;
      border-radius: 16px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(15, 15, 26, 0.72);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }
    .header.scrolled {
      background: rgba(15, 15, 26, 0.92);
      backdrop-filter: blur(20px);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo {
      font-size: 1.9rem;
      font-weight: 800;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      letter-spacing: -0.5px;
    }
    .logo-icon {
      color: var(--primary-orange);
      font-size: 2rem;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 0.3rem 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.2s ease;
      border-radius: 4px;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a.active::after {
      width: 65%;
    }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .menu-toggle span {
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 3px;
      transition: 0.2s ease;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: #0F0F1A;
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.35s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.4);
        font-size: 1.3rem;
      }
      .nav-links.open {
        transform: translateX(0);
      }
      .menu-toggle {
        display: flex;
        z-index: 1100;
      }
      .header {
        background: rgba(15,15,26,0.9);
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0F0F1A 0%, #2D1B4E 60%, #4B2B8A 100%);
      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: 0.28;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
    }
    .hero h1 {
      color: white;
      margin-bottom: 1.6rem;
    }
    .hero p {
      color: rgba(255,255,255,0.8);
      font-size: 1.3rem;
      margin-bottom: 2.5rem;
    }
    .hero-actions {
      display: flex;
      gap: 1.4rem;
      flex-wrap: wrap;
    }
    .scroll-indicator {
      position: absolute;
      bottom: 2.5rem;
      left: 50%;
      transform: translateX(-50%);
      color: var(--accent-cyan);
      font-size: 2rem;
      animation: float 2s infinite;
    }
    @keyframes float {
      0%,100%{ transform: translateX(-50%) translateY(0); }
      50%{ transform: translateX(-50%) translateY(8px); }
    }
    /* 通用板块 */
    .section {
      padding: 5.5rem 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 3.8rem 0;
      }
    }
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      color: var(--deep-blue);
    }
    /* 解决方案卡片错落 */
    .cards-grid {
      display: flex;
      gap: 2.2rem;
      justify-content: center;
      align-items: flex-start;
      flex-wrap: wrap;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-xl);
      padding: 2.4rem 2rem;
      box-shadow: var(--shadow-card);
      flex: 1 1 280px;
      max-width: 340px;
      transition: all 0.3s ease;
      border: 1px solid rgba(123,47,247,0.08);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .solution-card.middle {
      margin-top: -22px;
      background: linear-gradient(145deg, #ffffff 0%, #faf8ff 100%);
      box-shadow: 0 20px 35px rgba(123,47,247,0.12);
    }
    .card-icon {
      font-size: 2.9rem;
      color: var(--primary-orange);
      margin-bottom: 1.6rem;
    }
    .solution-card h3 {
      margin-bottom: 0.9rem;
    }
    .data-badge {
      margin-top: 1.6rem;
      background: #1A1A2E;
      color: var(--accent-cyan);
      padding: 0.3rem 1.2rem;
      border-radius: 30px;
      font-weight: 700;
      font-size: 1.2rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
      box-shadow: 0 0 12px rgba(0,229,255,0.3);
    }
    /* 数据墙 */
    .data-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding: 1.5rem 0.5rem 2rem;
      scrollbar-width: thin;
      scrollbar-color: var(--primary-purple) #eaeaf0;
    }
    .data-card {
      min-width: 220px;
      background: linear-gradient(145deg, #15152A, #1F1F38);
      border-radius: var(--radius-lg);
      padding: 2rem 1.8rem;
      text-align: center;
      color: white;
      box-shadow: 0 10px 22px rgba(0,0,0,0.3);
    }
    .data-number {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--accent-cyan);
      text-shadow: 0 0 15px #00e5ff;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }
    .testimonial {
      background: white;
      border-radius: var(--radius-xl);
      padding: 2.2rem;
      border-left: 6px solid var(--primary-purple);
      box-shadow: var(--shadow-card);
    }
    .quote-icon {
      font-size: 3.5rem;
      color: rgba(123,47,247,0.2);
      line-height: 1;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      text-align: left;
      padding: 1.3rem 0;
      font-weight: 700;
      font-size: 1.15rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--deep-blue);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      padding-left: 1.8rem;
      border-left: 2px solid var(--primary-purple);
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 260px;
      padding-top: 0.8rem;
      padding-bottom: 1.5rem;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0F0F1A, #3A1E6E);
      color: white;
      text-align: center;
      padding: 5rem 2rem;
      border-radius: 40px 40px 0 0;
    }
    /* 页脚 */
    .footer {
      background: #0F0F1A;
      color: #ccc;
      padding: 4rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2.5rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cards-grid {
        flex-direction: column;
        align-items: center;
      }
      .solution-card.middle {
        margin-top: 0;
      }
    }