/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --forge-orange: #E65A2E;
      --forge-orange-hover: #CC4F26;
      --bg-warm: #F5F3EF;
      --bg-secondary: #EAE6DF;
      --deep-panel: #2C2A28;
      --text-body: #4A4845;
      --text-muted: #7A7672;
      --border-light: #D1CDC7;
      --white: #FFFFFF;
      --success-green: #3A7D5A;
      --copper-tag: #D4A24E;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'SF Mono', 'Roboto Mono', 'Courier New', monospace;
      --radius-sm: 2px;
      --radius-card: 4px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --transition: 0.2s ease;
      --max-width: 1280px;
      --nav-height: 72px;
    }

    * {
      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: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background-color: var(--primary-black);
      color: var(--white);
      z-index: 50;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: baseline;
      gap: 4px;
      font-weight: 700;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: var(--white);
      text-decoration: none;
    }
    .logo .brand-xpj {
      color: var(--forge-orange);
    }
    .logo-icon {
      display: inline-block;
      width: 18px;
      height: 18px;
      border: 2px solid var(--forge-orange);
      border-radius: 2px;
      transform: rotate(45deg);
      margin-right: 10px;
      background: transparent;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      color: #D1CDC7;
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color var(--transition);
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--white);
    }

    .nav-cta {
      background-color: var(--forge-orange);
      color: var(--white) !important;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition);
    }
    .nav-cta:hover {
      background-color: var(--forge-orange-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--white);
      transition: var(--transition);
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 18px;
      }
      .nav-links a {
        font-size: 14px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: var(--primary-black);
        flex-direction: column;
        padding: 30px 24px;
        gap: 24px;
        transform: translateY(-120%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.3s ease;
        border-bottom: 1px solid rgba(255,255,255,0.1);
        align-items: flex-start;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        align-self: flex-start;
        width: auto;
        padding: 12px 28px;
      }
    }

    main {
      margin-top: var(--nav-height);
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    h2 {
      font-size: 36px;
      line-height: 44px;
      font-weight: 600;
      letter-spacing: -0.3px;
      color: var(--primary-black);
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      line-height: 30px;
      font-weight: 600;
      color: var(--primary-black);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-weight: 600;
      font-size: 14px;
      border-radius: var(--radius-sm);
      transition: all var(--transition);
      text-decoration: none;
      border: 1px solid transparent;
      cursor: pointer;
    }
    .btn-primary {
      background: var(--forge-orange);
      color: var(--white);
      border: none;
    }
    .btn-primary:hover {
      background: var(--forge-orange-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-black);
      color: var(--primary-black);
    }
    .btn-outline:hover {
      background: var(--primary-black);
      color: var(--white);
    }
    .btn-light {
      background: transparent;
      border: 1px solid var(--white);
      color: var(--white);
    }
    .btn-light:hover {
      background: var(--white);
      color: var(--primary-black);
    }

    /* Hero */
    .hero {
      background-color: var(--deep-panel);
      color: var(--white);
      position: relative;
      overflow: hidden;
      display: flex;
      align-items: center;
      min-height: 85vh;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 450px;
    }
    .hero-badge {
      color: var(--forge-orange);
      font-weight: 600;
      font-size: 14px;
      letter-spacing: 1px;
      margin-bottom: 16px;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 56px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      line-height: 28px;
      color: #D1CDC7;
      margin-bottom: 30px;
    }
    .hero-img {
      flex: 1 1 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 380px;
      border-radius: var(--radius-sm);
      box-shadow: 0 8px 24px rgba(0,0,0,0.4);
      filter: contrast(1.1) saturate(0.7);
    }
    @media (max-width: 768px) {
      .hero {
        min-height: auto;
        padding: 40px 0 60px;
      }
      .hero h1 {
        font-size: 32px;
        line-height: 40px;
      }
      .hero-img {
        min-height: 260px;
        width: 100%;
      }
    }

    /* 痛点卡片 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 32px;
      transition: box-shadow var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-card);
    }
    .card-icon {
      color: var(--forge-orange);
      font-size: 28px;
      margin-bottom: 16px;
    }
    @media (max-width: 1024px) {
      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .card-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案图文 */
    .solution-block {
      display: flex;
      gap: 48px;
      align-items: center;
      background: var(--bg-secondary);
      padding: 48px;
      border-radius: var(--radius-sm);
      margin-top: 40px;
    }
    .solution-img {
      flex: 1 1 45%;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
      background-position: center;
      min-height: 300px;
      border: 1px solid var(--border-light);
    }
    .solution-list {
      flex: 1 1 50%;
    }
    .solution-item {
      display: flex;
      gap: 20px;
      margin-bottom: 28px;
    }
    .solution-num {
      font-family: var(--font-mono);
      font-size: 24px;
      font-weight: 700;
      color: var(--forge-orange);
      width: 40px;
    }
    @media (max-width: 768px) {
      .solution-block {
        flex-direction: column;
        padding: 24px;
      }
      .solution-img {
        width: 100%;
        min-height: 220px;
      }
    }

    /* 数据深色区块 */
    .dark-stats {
      background: var(--deep-panel);
      color: var(--white);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-top: 40px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      color: var(--forge-orange);
    }
    @media (max-width: 1024px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: var(--white);
      border-left: 4px solid var(--forge-orange);
      padding: 28px;
      font-style: italic;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      margin-top: 30px;
      border-top: 1px solid var(--border-light);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary-black);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      padding-right: 30px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-dark {
      background: var(--primary-black);
      color: var(--white);
      text-align: center;
    }
    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 480px;
      margin: 30px auto 0;
    }
    .contact-form input,
    .contact-form textarea {
      background: #2C2A28;
      border: 1px solid #7A7672;
      color: white;
      padding: 14px;
      border-radius: var(--radius-sm);
      font-family: var(--font-sans);
    }
    .contact-form input:focus,
    .contact-form textarea:focus {
      outline: 2px solid var(--forge-orange);
      border-color: var(--forge-orange);
    }

    /* Footer */
    .footer {
      background: var(--primary-black);
      color: #7A7672;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #D1CDC7;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--white);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }