/* roulang page: index */
:root {
      --primary: #2C2416;
      --accent: #C8924A;
      --bg-warm: #FAF7F2;
      --bg-alt: #F5F0E8;
      --card-bg: #FFFFFF;
      --text-body: #3D3629;
      --text-muted: #8C8276;
      --border-soft: #E5DDD2;
      --testimonial-bg: #F9F4EC;
      --deep-footer: #1A1610;
      --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
      --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
      --font-number: "DM Sans", "Inter", sans-serif;
      --shadow-card: 0 1px 3px rgba(44,36,22,0.04), 0 6px 20px rgba(44,36,22,0.06);
      --shadow-hover: 0 4px 12px rgba(44,36,22,0.08), 0 10px 30px rgba(44,36,22,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 min(5vw, 80px);
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      color: var(--primary);
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: clamp(2.5rem, 5vw, 4.5rem);
      line-height: 1.1;
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: clamp(2rem, 3.5vw, 3rem);
      line-height: 1.2;
    }

    h3 {
      font-size: 1.5rem;
      line-height: 1.3;
      font-weight: 600;
    }

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

    a:hover {
      color: #B07D38;
    }

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

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

    /* 导航系统 */
    .nav-top-bar {
      background: var(--primary);
      color: var(--accent);
      font-size: 0.75rem;
      letter-spacing: 0.05em;
      padding: 0 0;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 min(5vw, 80px);
    }

    .nav-top-left, .nav-top-right {
      display: flex;
      align-items: center;
      gap: 16px;
      white-space: nowrap;
    }

    .nav-top-right span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-main {
      background: rgba(250, 247, 242, 0.92);
      backdrop-filter: blur(8px);
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 min(5vw, 80px);
      position: sticky;
      top: 0;
      z-index: 100;
      border-bottom: 1px solid var(--border-soft);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .db-mark {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 2rem;
      color: var(--accent);
      letter-spacing: -0.02em;
      line-height: 1;
      transform: skewX(-2deg);
      display: inline-block;
    }

    .logo-text {
      font-family: var(--font-serif);
      font-size: 1.2rem;
      letter-spacing: 0.15em;
      color: var(--primary);
      font-weight: 600;
      border-left: 1px solid var(--accent);
      padding-left: 12px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-size: 0.95rem;
      color: var(--text-body);
    }

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 1px;
      background: var(--accent);
      transition: width var(--transition);
    }

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

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.02em;
      box-shadow: 0 2px 6px rgba(200,146,74,0.2);
    }

    .btn-primary:hover {
      background: #B07D38;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(176,125,56,0.25);
    }

    .btn-outline {
      border: 1px solid var(--accent);
      color: var(--accent);
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(200,146,74,0.05);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--accent);
      display: block;
    }

    @media (max-width: 1024px) {
      .nav-links { gap: 20px; }
      .nav-top-right span:last-child { display: none; }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-main .btn-primary {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .nav-top-bar {
        font-size: 0.7rem;
        gap: 8px;
      }
    }

    /* 板块通用 */
    .section {
      padding: 120px 0;
    }
    .section-alt {
      background: var(--bg-alt);
    }
    .section-dark {
      background: var(--primary);
      color: white;
    }

    /* Hero */
    #hero {
      height: 100vh;
      background: linear-gradient(180deg, #2C2416 0%, #1A1610 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: #FAF7F2;
    }
    .hero-texture {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.06;
      mix-blend-mode: overlay;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero-tag {
      color: var(--accent);
      font-size: 0.9rem;
      letter-spacing: 0.1em;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .hero-tag::before {
      content: '';
      width: 40px;
      height: 1px;
      background: var(--accent);
    }
    .hero h1 {
      color: #FAF7F2;
      margin-bottom: 24px;
    }
    .hero-sub {
      color: var(--accent);
      font-size: 1.15rem;
      margin-bottom: 48px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .pain-list {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .pain-item {
      display: flex;
      align-items: baseline;
      gap: 12px;
      font-size: 1.1rem;
    }
    .pain-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      margin-top: 0.5rem;
      flex-shrink: 0;
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 60px;
    }
    .solution-card {
      background: var(--card-bg);
      padding: 40px 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      transform: translateY(-4px) scale(1.02);
      box-shadow: var(--shadow-hover);
    }
    .card-number {
      font-family: var(--font-serif);
      font-size: 3rem;
      color: var(--accent);
      opacity: 0.25;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .card-icon {
      margin: 12px 0;
      color: var(--accent);
    }
    .card-link {
      margin-top: 24px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border-bottom: 1px solid transparent;
    }
    .card-link:hover {
      border-bottom-color: var(--accent);
    }

    /* 流程时间轴 */
    .timeline {
      display: flex;
      justify-content: space-between;
      margin-top: 60px;
      position: relative;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 0;
      right: 0;
      height: 1px;
      background: var(--accent);
      opacity: 0.4;
    }
    .timeline-node {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .node-circle {
      width: 48px;
      height: 48px;
      background: var(--accent);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: bold;
      position: relative;
      z-index: 2;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: clamp(3rem, 6vw, 5rem);
      color: var(--accent);
      font-weight: 700;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .testimonial-card {
      background: var(--card-bg);
      padding: 40px;
      border-left: 3px solid var(--accent);
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
    }
    .stars {
      color: var(--accent);
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 60px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
      padding: 20px 0;
    }
    .faq-question {
      font-family: var(--font-serif);
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--bg-alt);
      margin-top: 16px;
      border-radius: 6px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 0 24px;
    }
    .faq-answer p {
      padding: 16px 0;
    }
    .faq-icon {
      font-size: 1.5rem;
      color: var(--accent);
    }

    /* CTA 终极区 */
    #cta {
      background: var(--primary);
      text-align: center;
      padding: 120px 20px;
      position: relative;
    }
    #cta h2 {
      color: white;
      margin-bottom: 16px;
    }
    .cta-sub {
      color: var(--accent);
      margin-bottom: 40px;
    }
    .cta-note {
      color: var(--text-muted);
      margin-top: 20px;
      font-size: 0.9rem;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 80px 0 40px;
    }
    .footer-bottom {
      border-top: 1px solid #3D3629;
      padding: 20px 0;
      text-align: center;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .timeline { flex-wrap: wrap; gap: 24px; }
    }
    @media (max-width: 768px) {
      .section { padding: 80px 0; }
      .pain-grid, .testimonial-grid, .footer-grid { grid-template-columns: 1fr; }
      .cards-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .hero-actions { flex-direction: column; align-items: flex-start; }
    }

    .reveal { opacity: 0; transform: translateY(30px); transition: 0.6s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }