/* roulang page: index */
/* yy易游体育 – zuohulan.com – 极简高端竞技风 */
    :root {
      --primary: #0B1E2F;
      --accent: #E85D04;
      --bg: #FAFAF8;
      --surface: #FFFFFF;
      --text: #2C3E50;
      --text-secondary: #7F8C8D;
      --text-on-dark: #F5F6FA;
      --border-light: #E8EAED;
      --border-input: #D5D8DC;
      --shadow-sm: 0 2px 12px rgba(11,30,47,0.06);
      --shadow-md: 0 8px 24px rgba(11,30,47,0.12);
      --shadow-glow: 0 0 0 2px rgba(232,93,4,0.2);
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-pill: 20px;
      --font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-title);
      background: var(--bg);
      color: var(--text);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: 80px;
    }

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

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

    a:hover {
      text-decoration: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250,250,248,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      height: 80px;
      display: flex;
      align-items: center;
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 16L8 12L12 16L20 6" stroke="white" stroke-width="2" fill="none"/><circle cx="20" cy="6" r="3" fill="white"/></svg>') center/contain no-repeat;
      background: var(--accent);
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-chip {
      background: #EDF0F2;
      color: var(--text);
      padding: 6px 18px;
      border-radius: var(--radius-pill);
      font-size: 0.9rem;
      font-weight: 500;
      transition: var(--transition);
      border-bottom: 2px solid transparent;
    }

    .nav-chip.active {
      background: var(--primary);
      color: white;
      border-bottom: 2px solid var(--accent);
    }

    .nav-chip:hover:not(.active) {
      background: #dce1e6;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #C94D03;
      transform: scale(1.03);
      color: white;
    }

    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--primary);
    }

    /* Hero */
    #hero {
      padding: 60px 0 100px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-text .accent-line {
      width: 40px;
      height: 6px;
      background: var(--accent);
      margin-bottom: 20px;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    .hero-text .sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-images {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .img-stack {
      position: relative;
      width: 100%;
      height: 400px;
    }
    .stack-img {
      position: absolute;
      width: 85%;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      transition: var(--transition);
      object-fit: cover;
      height: 240px;
    }
    .stack-img:nth-child(1) {
      top: 0;
      left: 0;
      transform: rotate(-3deg);
      z-index: 3;
    }
    .stack-img:nth-child(2) {
      top: 30px;
      right: 0;
      transform: rotate(2deg);
      z-index: 2;
    }
    .stack-img:nth-child(3) {
      bottom: 0;
      left: 15%;
      transform: rotate(-1deg);
      z-index: 1;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .feature-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }
    .right-stack {
      display: grid;
      gap: 24px;
    }
    .bottom-row {
      grid-column: span 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 0;
    }

    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .case-card {
      background: var(--surface);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .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-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(11,30,47,0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: 0.3s;
      color: white;
      font-weight: 600;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-content {
      padding: 20px;
    }
    .tag {
      background: #EDF0F2;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      font-size: 0.8rem;
      color: var(--primary);
    }

    /* 方案对比 */
    .solution-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .plan-card {
      background: var(--surface);
      padding: 36px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
      position: relative;
    }
    .plan-card.recommended {
      background: var(--primary);
      color: white;
      box-shadow: var(--shadow-glow);
    }
    .badge {
      background: var(--accent);
      color: white;
      padding: 6px 18px;
      border-radius: var(--radius-pill);
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .plan-list {
      list-style: none;
      text-align: left;
      margin: 2rem 0;
    }
    .plan-list li {
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      padding: 20px;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }
    .accordion-line {
      width: 2px;
      height: 24px;
      background: #D5D8DC;
      transition: 0.2s;
    }
    .is-active .accordion-line {
      background: var(--accent);
    }
    .accordion-content {
      padding: 0 20px 20px 40px;
      background: #F4F5F7;
      color: var(--text);
    }

    /* 联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
    }
    .input-field {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-sm);
      margin-bottom: 1.2rem;
      background: white;
    }
    .input-field:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(232,93,4,0.1);
      outline: none;
    }

    /* 页脚 */
    .site-footer {
      background: var(--primary);
      color: #A0B0C0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-links a {
      display: block;
      color: #A0B0C0;
    }
    .footer-links a:hover {
      color: white;
    }
    .copyright {
      text-align: center;
      font-size: 0.8rem;
      margin-top: 40px;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero-grid { grid-template-columns: 1fr; }
      .solution-cards { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .features-grid { grid-template-columns: 1fr; }
      .bottom-row { grid-column: span 1; grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }