/* roulang page: index */
:root {
      --primary-coral: #FF6B4A;
      --primary-coral-hover: #E55A3C;
      --secondary-deep: #1B2A4A;
      --accent-gold: #F5A623;
      --accent-gold-hover: #e09510;
      --bg-page: #FAFAFA;
      --bg-card: #FFFFFF;
      --bg-light-gray: #F0F0F0;
      --text-body: #333333;
      --text-muted: #666666;
      --text-light: #CCCCCC;
      --text-white: #FFFFFF;
      --border-light: #EEEEEE;
      --border-input: #DDDDDD;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 6px 20px rgba(0,0,0,0.1);
      --shadow-nav: 0 1px 8px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --max-width: 1200px;
      --section-gap-desktop: 90px;
      --section-gap-mobile: 60px;
      --nav-height: 64px;
      --nav-height-mobile: 56px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    /* 导航 */
    .nav-bar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      height: var(--nav-height);
      display: flex;
      align-items: center;
      transition: box-shadow 0.2s;
    }
    .nav-container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--secondary-deep);
      font-weight: 700;
      font-size: 1.3rem;
      letter-spacing: 0.02em;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-coral);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 1.2rem;
      box-shadow: 0 2px 6px rgba(255,107,74,0.3);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      text-decoration: none;
      color: var(--text-body);
      font-size: 0.95rem;
      font-weight: 500;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-coral);
      border-bottom-color: var(--primary-coral);
    }
    .nav-cta {
      background: var(--primary-coral);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      font-weight: 600;
      font-size: 0.95rem;
      transition: background 0.2s, box-shadow 0.2s;
      white-space: nowrap;
      display: inline-block;
    }
    .nav-cta:hover {
      background: var(--primary-coral-hover);
      box-shadow: 0 4px 14px rgba(255,107,74,0.4);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--secondary-deep);
      border-radius: 2px;
      transition: all 0.3s;
      display: block;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height-mobile);
      left: 0;
      width: 100%;
      height: calc(100vh - var(--nav-height-mobile));
      background: white;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding-top: 48px;
      gap: 28px;
      z-index: 99;
      list-style: none;
      box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    }
    .mobile-menu a {
      font-size: 1.25rem;
      text-decoration: none;
      color: var(--secondary-deep);
      font-weight: 600;
    }
    .mobile-menu .nav-cta {
      margin-top: 20px;
      font-size: 1.1rem;
      padding: 14px 32px;
    }

    @media (max-width: 768px) {
      .nav-menu, .nav-bar .nav-cta {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
      .nav-bar {
        height: var(--nav-height-mobile);
      }
    }

    /* 通用区块间距 */
    section {
      padding: var(--section-gap-desktop) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: var(--section-gap-mobile) 0;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(27,42,74,0.75) 0%, rgba(27,42,74,0.35) 100%);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      width: 100%;
    }
    .hero-content {
      max-width: 600px;
    }
    .hero h1 {
      font-size: 2.5rem;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: 0.02em;
      margin-bottom: 1rem;
    }
    .hero h1 .highlight {
      color: var(--accent-gold);
    }
    .hero p {
      font-size: 1.125rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      line-height: 1.6;
    }
    .btn-primary-large {
      background: var(--accent-gold);
      color: var(--secondary-deep);
      padding: 16px 36px;
      font-weight: 700;
      font-size: 1.1rem;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary-large:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.02);
    }
    .trust-badge {
      margin-top: 24px;
      font-size: 0.9rem;
      opacity: 0.8;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 1.9rem;
      }
      .hero-content {
        max-width: 100%;
      }
    }

    /* 通用标题 */
    .section-title {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--secondary-deep);
      margin-bottom: 1rem;
      line-height: 1.4;
    }
    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 卡片网格 */
    .grid-3, .grid-2 {
      display: grid;
      gap: 24px;
      margin-top: 16px;
    }
    .grid-3 {
      grid-template-columns: repeat(3, 1fr);
    }
    .grid-2 {
      grid-template-columns: repeat(2, 1fr);
    }
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-card-hover);
    }

    /* 痛点卡片 */
    .pain-card {
      border-left: 4px solid var(--primary-coral);
      background: #FAFAFA;
    }
    .pain-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 方案卡片图片 */
    .solution-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 16px;
    }

    /* 成果数字 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 证言 */
    .testimonial-card {
      display: flex;
      gap: 20px;
      background: #FAFAFA;
    }
    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: var(--primary-coral);
      border-radius: 50%;
      flex-shrink: 0;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: white;
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      background: #F9F9F9;
      padding: 0 20px 16px;
      color: #444;
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: var(--secondary-deep);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 24px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }
    .cta-form input {
      padding: 14px;
      border-radius: var(--radius-input);
      border: 1px solid var(--border-input);
      flex: 1 1 200px;
    }
    .btn-gold {
      background: var(--accent-gold);
      color: var(--secondary-deep);
      font-weight: 700;
      padding: 14px 32px;
      border: none;
      border-radius: var(--radius-btn);
      cursor: pointer;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary-deep);
      color: var(--text-light);
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .footer a {
      color: var(--text-light);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--primary-coral);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 32px;
      padding-top: 16px;
      font-size: 0.8rem;
    }