/* roulang page: index */
:root {
      --primary: #0A2E4D;
      --primary-light: #1B4A6B;
      --secondary: #D4A853;
      --secondary-deep: #C17F3E;
      --bg-warm: #F4F1EA;
      --white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-muted: #8A8A8A;
      --shadow-card: 0 10px 30px -10px rgba(10,46,77,0.08), 0 4px 8px rgba(0,0,0,0.02);
      --shadow-hover: 0 20px 40px -12px rgba(10,46,77,0.15);
      --radius-card: 24px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --max-width: 1280px;
      --section-gap: 100px;
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-cn);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: transparent;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(212,168,83,0.2);
      transition: background var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--secondary), var(--secondary-deep));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.2rem;
      box-shadow: 0 4px 10px rgba(212,168,83,0.3);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
      font-size: 0.95rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width var(--transition);
    }

    .nav-links a:hover {
      color: var(--secondary);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--secondary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      letter-spacing: 0.3px;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(212,168,83,0.25);
    }

    .btn-primary:hover {
      background: var(--secondary-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(193,127,62,0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline:hover {
      background: var(--secondary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
    }

    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--primary);
      border-radius: 4px;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #0A2E4D 0%, #1B4A6B 100%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 70%;
      height: 120%;
      background: radial-gradient(circle at 30% 40%, rgba(212,168,83,0.15) 0%, transparent 65%);
      pointer-events: none;
    }

    .hero-bg-img {
      position: absolute;
      right: -5%;
      bottom: -10%;
      width: 55%;
      opacity: 0.25;
      mask-image: linear-gradient(to left, black 30%, transparent 100%);
      -webkit-mask-image: linear-gradient(to left, black 30%, transparent 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      color: white;
    }

    .hero h1 {
      font-size: 52px;
      line-height: 1.25;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
      font-family: var(--font-cn);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: #F4F1EA;
      margin-bottom: 32px;
      max-width: 75ch;
    }

    .hero-badges {
      display: flex;
      gap: 40px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .badge-item {
      display: flex;
      flex-direction: column;
    }

    .badge-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--secondary);
      font-family: var(--font-en);
    }

    .badge-label {
      font-size: 0.9rem;
      color: rgba(255,255,255,0.7);
    }

    .hero-actions {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    /* 通用板块 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
      max-width: 600px;
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }

    .adv-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      position: relative;
    }

    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .adv-icon {
      width: 56px;
      height: 56px;
      background: rgba(212,168,83,0.1);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--secondary);
      margin-bottom: 20px;
    }

    .adv-card h3 {
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .adv-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
    }

    /* 里程碑数据 */
    .milestones {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 48px 40px;
      box-shadow: var(--shadow-card);
    }

    .milestone-item {
      text-align: center;
      flex: 1;
    }

    .milestone-num {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--secondary);
      font-family: var(--font-en);
    }

    .milestone-desc {
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 解决方案卡片 不等高混合 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }

    .solution-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .solution-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .solution-body {
      padding: 32px 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .solution-body h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    .solution-features {
      list-style: none;
      margin: 16px 0;
    }

    .solution-features li {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-secondary);
      margin-bottom: 8px;
    }

    .solution-features li::before {
      content: "✓";
      color: var(--secondary);
      font-weight: bold;
    }

    .text-link {
      color: var(--secondary);
      font-weight: 600;
      margin-top: auto;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: #fff;
      border-left: 4px solid var(--secondary);
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .case-client {
      font-weight: 700;
      color: var(--primary);
    }

    .case-result {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--secondary);
      margin: 12px 0;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: white;
      border-radius: 16px;
      padding: 24px 32px;
      cursor: pointer;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: background var(--transition);
    }

    .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;
      color: var(--text-secondary);
      margin-top: 0;
    }

    .faq-item.open .faq-answer {
      max-height: 150px;
      margin-top: 16px;
    }

    /* CTA尾屏 */
    .cta-footer {
      background: linear-gradient(120deg, #D4A853 0%, #C17F3E 100%);
      padding: 80px 0;
      color: white;
      text-align: center;
      border-radius: 0;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 620px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-input {
      background: white;
      border-radius: var(--radius-input);
      padding: 14px 20px;
      flex: 1;
      min-width: 180px;
    }

    .btn-dark {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition);
    }

    .btn-dark:hover {
      background: #0f3c5c;
    }

    /* Footer */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      display: block;
      margin-bottom: 8px;
    }

    .footer a:hover {
      color: var(--secondary);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2, 1fr); }
      .solutions-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.2rem; }
      .hero-badges { gap: 20px; }
      .advantages-grid, .solutions-grid, .cases-grid { grid-template-columns: 1fr; }
      .milestones { flex-direction: column; gap: 28px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .container { padding: 0 24px; }
      .section { padding: 60px 0; }
    }