/* roulang page: index */
:root {
      --primary: #7B2FFF;
      --primary-dark: #6928D9;
      --accent: #E63946;
      --accent-hover: #c92d3a;
      --deep-bg: #1A1A2E;
      --white: #F8F9FC;
      --gray-light: #EEF0F5;
      --text-main: #1e1e2f;
      --text-secondary: #5a5a72;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
      --font-cn: 'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
      --font-en: 'Inter','SF Pro Display',sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-cn);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    .logo {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 24px;
      background: linear-gradient(135deg, var(--primary) 0%, #a05bff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(26,26,46,0.95);
        backdrop-filter: blur(12px);
        flex-direction: column;
        gap: 2rem;
        padding: 2rem;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-radius: 0 0 16px 16px;
      }
      .nav-links.open {
        transform: translateY(0);
      }
      .nav-links a {
        color: white;
        font-size: 1.2rem;
        border-bottom: none;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: linear-gradient(135deg, #1A1A2E 0%, #2f1a4a 80%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: radial-gradient(rgba(123,47,255,0.15) 1px, transparent 1px);
      background-size: 28px 28px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-size: clamp(2.2rem, 5vw, 3.2rem);
      font-weight: 700;
      line-height: 1.3;
      color: white;
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-btns {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.85rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      min-width: 140px;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: white;
      padding: 0.8rem 1.95rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent);
      border-color: var(--accent);
      color: white;
    }
    .hero-right {
      position: relative;
    }
    .hero-img-wrapper {
      clip-path: polygon(8% 0, 100% 0, 92% 100%, 0% 100%);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    .hero-img-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left h1 {
        font-size: 2rem;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-btns {
        justify-content: center;
      }
      .hero-img-wrapper {
        clip-path: polygon(4% 0, 100% 0, 96% 100%, 0% 100%);
        margin-top: 2rem;
      }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
      color: var(--text-main);
    }
    .section-title::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 42px;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
    }
    .bg-gray {
      background-color: var(--gray-light);
    }

    /* 亮点网格 #advantages */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 3rem;
    }
    .adv-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 0.8rem;
    }
    .adv-card.large {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 2.4rem;
      color: var(--primary);
    }
    .adv-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }
    .adv-card p {
      color: var(--text-secondary);
    }
    @media (max-width: 768px) {
      .adv-grid {
        grid-template-columns: 1fr;
      }
      .adv-card.large {
        grid-row: auto;
      }
    }

    /* 案例瀑布 #cases */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 3rem;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      position: relative;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img img {
      transform: scale(1.05);
    }
    .case-mask {
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
      color: white;
      padding: 1.5rem;
      pointer-events: none;
    }
    .case-tag {
      background: var(--accent);
      color: white;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 0.4rem;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 方案对比 #services */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 3rem;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .plan-card.featured {
      transform: scale(1.02);
      box-shadow: 0 12px 30px rgba(123,47,255,0.2);
      border: 2px solid var(--primary);
      position: relative;
    }
    .plan-badge {
      background: var(--primary);
      color: white;
      font-size: 0.8rem;
      padding: 0.3rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      font-weight: 600;
    }
    .plan-list {
      list-style: none;
      margin: 1.5rem 0;
      text-align: left;
    }
    .plan-list li {
      margin: 0.7rem 0;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .check {
      color: var(--accent);
      font-weight: bold;
    }
    .minus {
      color: #aaa;
    }
    @media (max-width: 768px) {
      .compare-table {
        grid-template-columns: 1fr;
      }
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      margin-top: 3rem;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-num {
      background: var(--primary);
      color: white;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-weight: 700;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        gap: 2rem;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 3rem auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding-left: 1.5rem;
      border-left: 3px solid var(--primary);
      margin-top: 0.8rem;
    }

    /* CTA */
    .cta-section {
      background: #1A1A2E;
      background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
      background-size: 25px 25px;
      text-align: center;
      color: white;
    }
    .btn-cta {
      background: var(--primary);
      color: white;
      padding: 1rem 2.8rem;
      border-radius: 50px;
      font-weight: 700;
      display: inline-block;
      margin-top: 2rem;
      position: relative;
      overflow: hidden;
    }
    .btn-cta::after {
      content: "";
      position: absolute;
      top: 0;
      left: -80%;
      width: 60%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
      transform: skewX(-20deg);
      transition: left 0.7s;
    }
    .btn-cta:hover::after {
      left: 120%;
    }

    /* 页脚 */
    .footer {
      background: #0f0f1a;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }