/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --deep-blue: #0A0E27;
      --dark-surface: #1A1F3A;
      --electric-purple: #7B2FF7;
      --electric-purple-light: #9D4EDD;
      --accent-orange: #FF6B35;
      --white: #FFFFFF;
      --gray-light: #E0E0E0;
      --gray-mid: #9E9E9E;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --glass-bg-hover: rgba(255, 255, 255, 0.08);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.1);
      --card-shadow-hover: 0 12px 40px rgba(123,47,247,0.3), 0 8px 32px rgba(0,0,0,0.5);
      --btn-glow: 0 4px 15px rgba(123,47,247,0.4);
      --btn-glow-hover: 0 6px 25px rgba(123,47,247,0.7), 0 0 0 4px rgba(123,47,247,0.2);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-icon: 12px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Roboto", sans-serif;
      background: radial-gradient(circle at 20% 30%, #1A1F3A, #0A0E27 80%);
      color: var(--gray-light);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--white);
      letter-spacing: normal;
    }

    h1 {
      font-size: clamp(2.2rem, 6vw, 3rem);
      line-height: 1.2;
      margin-bottom: 1.25rem;
    }

    h2 {
      font-size: clamp(1.8rem, 5vw, 2.4rem);
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: clamp(1.25rem, 3.5vw, 1.5rem);
      line-height: 1.4;
      margin-bottom: 0.75rem;
    }

    p {
      font-size: 1rem;
      color: var(--gray-light);
      margin-bottom: 1rem;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* ----- 导航栏（沉浸式玻璃） ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.78);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      height: 72px;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.3rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--electric-purple), var(--accent-orange));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 0 12px rgba(123,47,247,0.6);
      color: white;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
    }

    .nav-menu a {
      font-size: 0.95rem;
      color: var(--gray-light);
      padding: 6px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--electric-purple-light);
    }

    .nav-cta {
      background: var(--electric-purple);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: 50px;
      font-weight: 600;
      box-shadow: var(--btn-glow);
      transition: all 0.25s;
    }

    .nav-cta:hover {
      background: var(--electric-purple-light);
      box-shadow: var(--btn-glow-hover);
      transform: scale(1.03);
    }

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

    .hamburger span {
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 4px;
      transition: 0.3s;
    }

    @media (max-width: 1024px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(10, 14, 39, 0.95);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 100px 30px 40px;
        gap: 2rem;
        transition: right 0.4s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.6);
        z-index: 999;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-cta {
        width: fit-content;
      }
    }

    /* ----- 按钮系统 ----- */
    .btn-primary {
      background: linear-gradient(135deg, var(--electric-purple), var(--electric-purple-light));
      color: white;
      border: none;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.5px;
      box-shadow: var(--btn-glow);
      cursor: pointer;
      display: inline-block;
      transition: all 0.25s;
      text-align: center;
    }

    .btn-primary:hover {
      box-shadow: var(--btn-glow-hover);
      transform: scale(1.03);
      background: var(--electric-purple-light);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--electric-purple);
      color: var(--electric-purple);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(123,47,247,0.15);
      color: white;
      border-color: var(--electric-purple-light);
    }

    .btn-text {
      color: var(--accent-orange);
      font-weight: 500;
      background: none;
      border: none;
      cursor: pointer;
    }

    /* ----- 区块通用 ----- */
    section {
      padding: 90px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    /* ----- Hero 首屏 ----- */
    .hero {
      padding-top: 160px;
      padding-bottom: 100px;
      display: flex;
      align-items: center;
      min-height: 90vh;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(2px);
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-graphic {
      width: 280px;
      height: 280px;
      background: radial-gradient(circle, rgba(123,47,247,0.3) 0%, transparent 70%);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      animation: float 6s ease-in-out infinite;
    }

    .shield-icon {
      font-size: 8rem;
      filter: drop-shadow(0 0 25px #7B2FF7);
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-14px); }
      100% { transform: translateY(0px); }
    }

    @media (max-width: 768px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-visual {
        order: -1;
        margin-bottom: 20px;
      }
    }

    /* ----- 优势卡片（2:1:1 栅格） ----- */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      color: var(--gray-light);
    }

    .glass-card:hover {
      background: var(--glass-bg-hover);
      border-color: var(--electric-purple);
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-6px);
    }

    .icon-purple {
      color: var(--electric-purple);
      font-size: 2.4rem;
      margin-bottom: 18px;
    }

    @media (max-width: 992px) {
      .advantages-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 600px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- 服务体系图片卡片 ----- */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--glass-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--glass-border);
      transition: 0.3s;
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--electric-purple);
      box-shadow: var(--card-shadow-hover);
    }

    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .badge-hot {
      position: absolute;
      top: 12px;
      left: 12px;
      background: var(--accent-orange);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    @media (max-width: 992px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- 证言轮播 ----- */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }

    .testimonial-card {
      min-width: 280px;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: 16px;
      padding: 24px;
      scroll-snap-align: start;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .stars {
      color: var(--accent-orange);
      margin-bottom: 12px;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      margin-bottom: 8px;
    }

    .faq-question {
      background: transparent;
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      font-size: 1.1rem;
      font-weight: 600;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(255,255,255,0.02);
      padding: 0 24px;
    }

    .faq-answer p {
      padding-bottom: 20px;
    }

    /* ----- CTA 最终大按钮区块 ----- */
    .cta-dark {
      background: #060A1A;
      text-align: center;
      padding: 80px 20px;
    }

    /* ----- 页脚 ----- */
    .site-footer {
      background: #060A1A;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .footer-bottom {
      margin-top: 40px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--gray-mid);
    }