/* roulang page: index */
:root {
      --brand-deep-green: #0B3D2E;
      --brand-dark-green: #0A2A1F;
      --brand-orange: #E94E1F;
      --brand-orange-dark: #C73E12;
      --warm-sand: #F5F0E8;
      --charcoal: #1C1C1C;
      --gray-green: #6B7B6F;
      --amber-yellow: #FFB800;
      --amber-dark: #E69500;
      --white: #FFFFFF;
      --off-white: #EDF0EE;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Display", "Helvetica Neue", sans-serif;
      --shadow-sm: 0 2px 12px rgba(11, 61, 46, 0.06);
      --shadow-md: 0 8px 32px rgba(11, 61, 46, 0.12);
      --shadow-btn: 0 6px 20px rgba(233, 78, 31, 0.4);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-tag: 8px;
      --radius-img: 16px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-sand);
      color: var(--charcoal);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
    }

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

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: var(--transition);
      padding: 0 0;
    }

    #header::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(90deg, var(--brand-deep-green) 0%, var(--brand-orange) 100%);
    }

    #header.scrolled {
      background: rgba(255, 255, 255, 1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid rgba(11,61,46,0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--brand-deep-green);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--brand-deep-green);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .logo-icon::before {
      content: '';
      width: 14px;
      height: 14px;
      background: var(--amber-yellow);
      border-radius: 50%;
      position: absolute;
      right: -2px;
      top: -2px;
      box-shadow: 0 0 0 2px white;
    }

    .logo-icon::after {
      content: '';
      width: 18px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transform: rotate(45deg);
    }

    .logo-text {
      display: flex;
      flex-direction: column;
    }
    .logo-main {
      font-size: 1.3rem;
      line-height: 1.2;
      font-weight: 700;
    }
    .logo-sub {
      font-size: 0.65rem;
      font-weight: 500;
      color: var(--gray-green);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--charcoal);
    }

    .nav-links a {
      position: relative;
      padding: 8px 0;
      font-size: 0.95rem;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--brand-orange);
      border-radius: 3px;
      transition: width 0.2s ease;
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--brand-deep-green);
      border-radius: 4px;
      transition: var(--transition);
    }

    /* 首屏 */
    #hero {
      background: linear-gradient(135deg, #0B3D2E 0%, #0A2A1F 100%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 100px;
      color: white;
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      mix-blend-mode: overlay;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .live-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--amber-yellow);
      color: #1C1C1C;
      padding: 6px 16px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 0.9rem;
      letter-spacing: 0.5px;
      width: fit-content;
      animation: pulse 2s infinite;
      box-shadow: 0 0 0 4px rgba(255,184,0,0.3);
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,184,0,0.5); }
      70% { box-shadow: 0 0 0 12px rgba(255,184,0,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,184,0,0); }
    }

    .hero-left h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 5vw, 4rem);
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: white;
    }

    .hero-sub {
      font-size: 1.1rem;
      opacity: 0.9;
      max-width: 480px;
      color: rgba(255,255,255,0.85);
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #E94E1F 0%, #C73E12 100%);
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 1rem;
      transition: var(--transition);
      box-shadow: 0 8px 18px rgba(233,78,31,0.3);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(233,78,31,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
    }

    .hero-right {
      flex: 1;
      position: relative;
    }

    .hero-image-card {
      background: rgba(255,255,255,0.08);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    .hero-image-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 亮点 */
    #highlights {
      padding: 80px 0;
      background: var(--warm-sand);
    }

    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .highlight-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: left;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(11,61,46,0.08);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--brand-deep-green);
      font-size: 1.8rem;
    }

    .data-badge {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 2.3rem;
      background: linear-gradient(135deg, #FFB800, #E69500);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }

    .highlight-card h3 {
      font-weight: 600;
      font-size: 1.3rem;
      margin: 12px 0 8px;
    }

    /* 服务瀑布流 */
    #services {
      padding: 80px 0;
      background: #EDF0EE;
    }

    .section-title {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .title-bar {
      width: 6px;
      height: 32px;
      background: var(--brand-orange);
      border-radius: 4px;
    }
    .section-title h2 {
      font-weight: 700;
      font-size: clamp(1.8rem, 3vw, 2.4rem);
      color: var(--brand-deep-green);
    }

    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: fit-content;
    }
    .service-card:nth-child(2) { margin-top: 20px; }
    .service-card:nth-child(4) { margin-top: -16px; }

    .service-card:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-md);
    }
    .service-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .service-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .service-content h3 {
      font-weight: 700;
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    .service-cta {
      margin-top: 16px;
      color: var(--brand-orange);
      font-weight: 600;
      opacity: 0;
      transform: translateY(10px);
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .service-card:hover .service-cta {
      opacity: 1;
      transform: translateY(0);
    }

    /* 对比 */
    #compare {
      padding: 80px 0;
      background: var(--warm-sand);
    }
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: start;
    }
    .compare-card {
      background: white;
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .compare-card.recommend {
      border: 2px solid transparent;
      background-clip: padding-box;
      position: relative;
      border-image: linear-gradient(135deg, #E94E1F, #FFB800) 1;
      border-radius: 24px;
    }
    .recommend-tag {
      background: var(--amber-yellow);
      color: #1C1C1C;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }
    .compare-list {
      list-style: none;
      margin: 20px 0;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 14px;
    }

    /* FAQ */
    #faq {
      padding: 80px 0;
      background: white;
    }
    .faq-item {
      border-bottom: 1px solid rgba(11,61,46,0.1);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      padding: 20px 0;
      display: flex;
      align-items: center;
      gap: 16px;
      font-weight: 600;
      font-size: 1.1rem;
      text-align: left;
      color: var(--charcoal);
      transition: var(--transition);
    }
    .faq-question.active {
      color: var(--brand-orange);
    }
    .q-badge {
      width: 32px;
      height: 32px;
      background: var(--brand-deep-green);
      color: white;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-in-out;
      padding-left: 50px;
    }
    .faq-answer.open {
      max-height: 200px;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #0B3D2E, #0A2A1F);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-btn-white {
      background: white;
      color: var(--brand-orange);
      padding: 16px 40px;
      border-radius: 50px;
      font-weight: 700;
      display: inline-block;
      margin-top: 24px;
    }

    /* 页脚 */
    #footer {
      background: #0B3D2E;
      color: rgba(255,255,255,0.8);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.2);
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .highlights-grid { grid-template-columns: 1fr; }
      .masonry-grid { grid-template-columns: 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }