/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --warm-bg: #F5F0EB;
      --accent-terracotta: #E85D3A;
      --accent-hover: #C94A2D;
      --text-body: #2C2C2C;
      --border-light: #D1C9C1;
      --white: #FFFFFF;
      --footer-bg: #1A1A1A;
      --footer-text: #D1C9C1;
      --transition-smooth: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-button: 4px;
      --spacing-section: 120px;
      --max-width-container: 1100px;
      --font-serif: 'Noto Serif SC', serif;
      --font-sans: 'Inter', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-body);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    h1, h2, h3 {
      font-family: var(--font-serif);
      color: var(--primary-black);
    }

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

    /* 杂志频道导航 */
    .brand-bar {
      background: var(--white);
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      border-bottom: 1px solid var(--border-light);
    }

    .logo {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-black);
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--accent-terracotta);
    }

    .utility-icons {
      display: flex;
      gap: 24px;
      color: var(--primary-black);
      font-size: 1.2rem;
    }
    .utility-icons i {
      cursor: pointer;
      transition: color 0.2s;
    }
    .utility-icons i:hover {
      color: var(--accent-terracotta);
    }

    .channel-bar {
      background: var(--white);
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-bottom: 1px solid var(--border-light);
      overflow-x: auto;
      white-space: nowrap;
    }
    .channel-link {
      margin: 0 16px;
      font-weight: 500;
      font-size: 0.9rem;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
      transition: color 0.25s;
      letter-spacing: 0.4px;
    }
    .channel-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent-terracotta);
      transition: width 0.3s ease, left 0.3s ease;
    }
    .channel-link:hover {
      color: var(--accent-terracotta);
    }
    .channel-link:hover::after {
      width: 100%;
      left: 0;
    }

    /* 移动端汉堡菜单 */
    #mobile-menu-trigger {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--primary-black);
      cursor: pointer;
    }
    .mobile-nav-panel {
      display: none;
      background: var(--white);
      padding: 16px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .mobile-nav-panel a {
      display: block;
      padding: 12px 24px;
      font-weight: 500;
      border-bottom: 1px solid #f0f0f0;
    }

    /* Hero */
    .hero-section {
      background-color: var(--warm-bg);
      position: relative;
      overflow: hidden;
      padding: 80px 0 100px;
    }
    .hero-geometry {
      position: absolute;
      right: 0;
      top: 0;
      width: 40%;
      height: 100%;
      opacity: 0.25;
      pointer-events: none;
    }
    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-body);
      margin-bottom: 2.5rem;
      max-width: 600px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-terracotta);
      color: var(--white);
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 0.875rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      cursor: pointer;
      transition: background 0.25s ease, transform 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      color: var(--white);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary-black);
      border: 1px solid var(--primary-black);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 0.875rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
    }
    .btn-secondary:hover {
      background: var(--primary-black);
      color: var(--warm-bg);
      transform: translateY(-2px);
    }

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

    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      margin-bottom: 2.5rem;
      letter-spacing: -0.3px;
    }

    /* 痛点卡片 */
    .pain-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      position: relative;
      border-left: 3px solid var(--accent-terracotta);
      margin-bottom: 30px;
      height: 100%;
    }
    .pain-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .pain-icon {
      font-size: 1.8rem;
      color: var(--primary-black);
      margin-bottom: 1rem;
    }
    .pain-statement {
      font-weight: 700;
      font-size: 1.2rem;
      color: var(--primary-black);
      margin-bottom: 0.5rem;
    }

    /* 解决方案步骤 */
    .step-item {
      position: relative;
      padding: 2rem;
    }
    .step-number {
      font-family: var(--font-serif);
      font-size: 6rem;
      font-weight: 700;
      color: rgba(26,26,26,0.05);
      position: absolute;
      left: 0;
      top: -20px;
      line-height: 1;
      z-index: 0;
    }
    .step-content {
      position: relative;
      z-index: 1;
    }
    .step-title {
      font-size: 1.8rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    /* 案例卡片 */
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .case-img {
      height: 220px;
      object-fit: cover;
      width: 100%;
    }
    .case-body {
      padding: 1.5rem;
    }
    .case-metric {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-terracotta);
    }

    /* 证言 */
    .testimonial-block {
      background: #F0EBE5;
      border-radius: var(--radius-card);
      padding: 3rem;
    }
    .quote-mark {
      font-size: 4rem;
      color: var(--accent-terracotta);
      opacity: 0.7;
      line-height: 1;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      background: var(--white);
    }
    .faq-question {
      padding: 1.25rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: var(--white);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: var(--warm-bg);
      padding: 0 1.25rem;
    }
    .faq-answer.open {
      max-height: 300px;
      padding: 1.25rem;
    }

    /* CTA 底部 */
    .cta-full {
      background: var(--accent-terracotta);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-full h2 {
      color: white;
    }

    /* 页脚 */
    .site-footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 30px;
    }
    .footer-input {
      background: #2C2C2C;
      border: none;
      color: white;
      padding: 12px;
      width: 100%;
      border-radius: 4px;
    }
    .footer-input::placeholder {
      color: #888;
    }

    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.8rem;
      }
      .channel-bar {
        justify-content: flex-start;
        padding-left: 20px;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .section-block {
        padding: 60px 0;
      }
      .brand-bar {
        padding: 0 20px;
      }
      .channel-bar {
        display: none;
      }
      #mobile-menu-trigger {
        display: block;
      }
      .mobile-nav-panel.show {
        display: block;
      }
      .hero-geometry {
        display: none;
      }
    }