/* roulang page: index */
:root {
      --primary-deep: #1A103C;
      --primary-dark: #0D0B1E;
      --accent-purple: #9D4EDD;
      --accent-purple-light: #C77DFF;
      --accent-cyan: #00F5D4;
      --accent-blue: #00BBF9;
      --text-primary: #F0EDF5;
      --text-secondary: #B0A8C9;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(255, 255, 255, 0.15);
      --card-bg: rgba(20, 15, 40, 0.5);
      --card-bg-hover: rgba(30, 20, 55, 0.7);
      --glass-nav: rgba(10, 8, 22, 0.45);
      --glass-nav-scroll: rgba(10, 8, 22, 0.85);
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 25px rgba(157, 78, 221, 0.7);
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background: radial-gradient(circle at 20% 10%, #1A103C 0%, #0D0B1E 85%);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      position: relative;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800" opacity="0.08"><path d="M0 400 Q150 200 400 400 T800 400 T1200 300" stroke="%239D4EDD" fill="none" stroke-width="1.2"/><circle cx="200" cy="150" r="30" fill="%2300F5D4" filter="blur(18px)"/><circle cx="950" cy="650" r="45" fill="%239D4EDD" filter="blur(25px)"/></svg>');
      background-size: cover;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      position: relative;
      z-index: 1;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: var(--glass-nav);
      backdrop-filter: blur(22px);
      -webkit-backdrop-filter: blur(22px);
      border-bottom: 1px solid var(--border-subtle);
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }

    .navbar.scrolled {
      background: var(--glass-nav-scroll);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      max-width: 1200px;
      margin: 0 auto;
      height: 70px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: 1px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
      position: relative;
    }
    .logo i {
      color: var(--accent-purple-light);
      font-size: 2rem;
      text-shadow: 0 0 12px rgba(157,78,221,0.6);
    }

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

    .nav-links a {
      color: #D0C8E0;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s, text-shadow 0.2s;
      position: relative;
      padding: 6px 0;
    }

    .nav-links a:hover {
      color: var(--accent-purple-light);
      text-shadow: 0 0 8px rgba(157,78,221,0.7);
    }

    .nav-cta {
      background: var(--accent-purple);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      box-shadow: 0 0 18px rgba(157, 78, 221, 0.6);
      transition: all 0.25s;
      font-weight: 600;
    }
    .nav-cta:hover {
      background: var(--accent-purple-light);
      box-shadow: 0 0 30px rgba(157,78,221,1);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: 0.3s;
    }

    @media (max-width: 840px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,8,20,0.9);
        backdrop-filter: blur(28px);
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-glow);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 70px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    #hero::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(13,11,30,0.7) 0%, rgba(26,16,60,0.55) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 6vw, 3.8rem);
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
      margin-bottom: 1.5rem;
      text-shadow: 0 4px 18px rgba(0,0,0,0.5);
    }
    .hero .subtitle {
      font-size: 1.3rem;
      color: #D0C8E0;
      margin-bottom: 2.5rem;
      max-width: 550px;
    }
    .btn-glow {
      background: var(--accent-purple);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1.1rem;
      box-shadow: var(--shadow-glow);
      border: none;
      transition: 0.25s;
      display: inline-block;
      text-decoration: none;
    }
    .btn-glow:hover {
      background: var(--accent-purple-light);
      box-shadow: 0 0 45px rgba(157,78,221,1);
      transform: translateY(-2px);
      color: white;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 2.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: "";
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 50px;
      height: 3px;
      background: linear-gradient(to right, var(--accent-purple), var(--accent-cyan));
      border-radius: 2px;
    }

    /* 服务卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 2rem;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 2rem;
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 48px rgba(157, 78, 221, 0.35);
      background: rgba(30,20,55,0.65);
    }
    .icon-placeholder {
      width: 64px;
      height: 64px;
      background: rgba(157,78,221,0.2);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      color: var(--accent-cyan);
      margin-bottom: 1.5rem;
    }

    /* 优势数据条 */
    .stats-bar {
      background: rgba(10,8,20,0.7);
      backdrop-filter: blur(16px);
      border-radius: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      padding: 2.5rem 1rem;
      margin-top: 2rem;
      border: 1px solid var(--border-glow);
    }
    .stat-item {
      text-align: center;
      flex: 1;
      min-width: 160px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3.2rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--accent-purple-light), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .case-grid { grid-template-columns: 1fr; }
    }
    .case-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 12px;
      transition: transform 0.4s;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
    }
    .solution-img img {
      width: 100%;
      border-radius: 20px;
    }
    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

    /* FAQ */
    .accordion-item {
      background: rgba(25,18,45,0.5);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      margin-bottom: 14px;
    }
    .accordion-title {
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--text-primary);
    }
    .accordion-content {
      padding: 0 1.8rem 1.5rem;
      color: var(--text-secondary);
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-item.active {
      border-color: rgba(157,78,221,0.5);
    }

    /* 表单 */
    .contact-form input, .contact-form textarea {
      background: rgba(20,15,38,0.7);
      border: 1px solid var(--border-glow);
      border-radius: 8px;
      color: white;
      padding: 0.9rem;
      width: 100%;
      margin-bottom: 1rem;
    }
    .contact-form input:focus {
      border-color: var(--accent-purple);
      box-shadow: 0 0 15px rgba(157,78,221,0.7);
      outline: none;
    }

    footer {
      background: #0A0816;
      padding: 3rem 0;
      text-align: center;
      color: #6A6180;
      border-top: 1px solid rgba(157,78,221,0.2);
    }
    footer a {
      color: #B0A8C9;
      margin: 0 12px;
    }