/* roulang page: index */
:root {
      --primary: #0B2B26;
      --primary-hover: #143D35;
      --accent: #C87A4F;
      --accent-hover: #A8653D;
      --bg-warm: #F9F7F4;
      --bg-light-gray: #EEF0EB;
      --text-dark: #2D2D2D;
      --text-mid: #6B6B6B;
      --white: #FFFFFF;
      --border-light: #E5E5E0;
      --border-accent: rgba(200, 122, 79, 0.25);
      --shadow-card: 0 8px 30px rgba(11, 43, 38, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --gap-section: 120px;
      --grid-max: 1280px;
      --header-height: 72px;
      --mobile-nav-height: 56px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      background: var(--bg-warm);
    }
    body {
      font-family: var(--font-body);
      font-weight: 400;
      line-height: 1.6;
      color: var(--text-dark);
      background: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: var(--grid-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--header-height);
      display: flex;
      align-items: center;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
    }
    .site-header.scrolled {
      background: var(--bg-warm);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.3px;
      color: white;
      transition: color 0.3s ease;
    }
    .scrolled .logo {
      color: var(--primary);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><path d="M13 2L3 14h9l-1 8 10-12h-9l1-8z"/></svg>') center/cover no-repeat;
      background: white;
      transition: background 0.3s;
    }
    .scrolled .logo-icon {
      background: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      font-weight: 500;
      font-size: 0.95rem;
      color: rgba(255,255,255,0.9);
      transition: color 0.3s;
    }
    .scrolled .nav-links {
      color: var(--primary);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-nav-height);
      background: var(--white);
      box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
      justify-content: space-around;
      align-items: center;
      z-index: 999;
      border-top: 1px solid var(--border-light);
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--text-mid);
      gap: 4px;
      font-weight: 500;
    }
    .mobile-nav a.active {
      color: var(--accent);
    }
    .mobile-nav i {
      font-size: 1.2rem;
    }
    @media (max-width: 640px) {
      .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .site-header {
        background: var(--bg-warm);
      }
      .logo {
        color: var(--primary);
      }
      .logo-icon {
        background: var(--primary);
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: var(--primary);
      position: relative;
      overflow: hidden;
      padding-top: var(--header-height);
    }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 3.5rem;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 1.2rem;
      animation: fadeInUp 0.8s ease;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: rgba(255,255,255,0.8);
      max-width: 480px;
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
  }
    .btn-outline:hover {
      background: rgba(200,122,79,0.1);
      transform: translateY(-2px);
    }
    .hero-visual {
      position: relative;
      height: 420px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(11,43,38,0.5);
      mix-blend-mode: overlay;
    }
    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(30px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-title {
        font-size: 2.8rem;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .btn-group {
        justify-content: center;
      }
      .hero-visual {
        height: 300px;
        margin-top: 20px;
      }
    }
    @media (max-width: 640px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .btn-group {
        flex-direction: column;
        align-items: center;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        padding: 12px 24px;
      }
    }
    /* 通用板块 */
    section {
      padding: var(--gap-section) 0;
    }
    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.4rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    .section-desc {
      color: var(--text-mid);
      max-width: 640px;
      margin-bottom: 2.5rem;
    }
    /* 痛点 */
    .pain-points {
      background: var(--bg-warm);
      text-align: center;
    }
    .pain-item {
      font-size: 1.4rem;
      font-weight: 300;
      color: var(--text-dark);
      position: relative;
      display: inline-block;
      margin: 0 30px 20px;
      line-height: 1.8;
    }
    .pain-item::before {
      content: open-quote;
      font-size: 5rem;
      color: var(--accent);
      opacity: 0.25;
      position: absolute;
      left: -35px;
      top: -30px;
    }
    /* 解决方案 错层 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 30px;
    }
    .solution-item {
      padding: 32px;
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      transition: all 0.25s ease;
      position: relative;
    }
    .solution-item:nth-child(2) {
      transform: translateY(-16px);
    }
    .solution-item:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-card);
    }
    .solution-icon {
      width: 48px;
      height: 48px;
      background: var(--bg-light-gray);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--accent);
      font-size: 1.5rem;
    }
    .solution-label {
      font-weight: 700;
      color: var(--primary);
      font-size: 1.3rem;
      margin-bottom: 0.6rem;
    }
    @media (max-width: 768px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .solution-item:nth-child(2) {
        transform: none;
      }
    }
    /* 成果数据 */
    .results {
      background: var(--primary);
      color: white;
    }
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;

    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 3.5rem;
      font-weight: 600;
      color: var(--accent);
    }
    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: 3fr 2fr;
      gap: 24px;
    }
    .testimonial-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      position: relative;
}    
    .testimonial-main {
      grid-row: span 2;
    }
    .quote-mark {
      font-size: 6rem;
      color: var(--accent);
      opacity: 0.2;
      position: absolute;
      top: 0;
      left: 20px;
    }
    .testimonial-text {
      font-style: italic;
      margin: 1rem 0;
    }
    .author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 1.5rem;
    }
    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: 2px solid var(--accent);
      background: url('/assets/images/coverpic/cover-2.webp') center/cover;
    }
    @media (max-width: 768px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-mid);
      padding-right: 30px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-icon {
      transition: transform 0.3s;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-input);
      border: none;
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .cta-form input:focus, .cta-form textarea:focus {
      outline: 2px solid var(--accent);
    }
    .btn-glow {
      position: relative;
      overflow: hidden;
    }
    .btn-glow::after {
      content: '';
      position: absolute;
      left: -50%;
      top: 0;
      width: 50%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
      transition: left 0.5s ease;
    }
    .btn-glow:hover::after {
      left: 120%;
    }
    footer {
      background: var(--bg-warm);
      text-align: center;
      padding: 36px 0;
      font-size: 0.9rem;
      color: var(--text-mid);
    }
    .back-to-top {
      display: inline-block;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      line-height: 38px;
      margin-top: 16px;
    }
    @media (prefers-reduced-motion: reduce) {
      * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
      }
    }