/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-hover: #C93510;
      --dark: #1E2022;
      --bg: #FAF7F2;
      --card-bg: #FFFFFF;
      --border: #E8E3DC;
      --text-main: #1E2022;
      --text-sub: #6B6560;
      --success: #2E8B57;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(30,32,34,0.06);
      --shadow-card-hover: 0 8px 28px rgba(30,32,34,0.10);
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-num: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg);
    }
    body {
      font-family: var(--font-cn);
      color: var(--text-main);
      background: var(--bg);
      line-height: 1.7;
      font-size: 16px;
      -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(--header-height);
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 0 var(--border);
      display: flex;
      align-items: center;
      z-index: 1000;
      transition: box-shadow 0.2s;
    }
    .header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      text-decoration: none;
      white-space: nowrap;
    }
    .logo span {
      font-weight: 700;
      color: var(--dark);
      font-size: 1.4rem;
      margin-left: 2px;
    }
    .nav-menu {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-link {
      color: var(--dark);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .header-cta {
      background: var(--primary);
      color: white;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s;
    }
    .header-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(232,69,30,0.3);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--dark);
      cursor: pointer;
    }
    /* 响应式导航面板 */
    .mobile-panel {
      display: none;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-panel {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: white;
        z-index: 999;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transform: translateY(-100%);
        transition: transform 0.35s ease;
      }
      .mobile-panel.open {
        transform: translateY(0);
      }
      .mobile-panel a {
        font-size: 1.8rem;
        color: var(--dark);
        text-decoration: none;
        font-weight: 600;
      }
      .mobile-close {
        position: absolute;
        top: 24px;
        right: 24px;
        background: none;
        border: none;
        font-size: 2rem;
        cursor: pointer;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-size: 36px;
      line-height: 44px;
      font-weight: 700;
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
    }
    .section-sub {
      color: var(--text-sub);
      font-size: 18px;
      margin-bottom: 2.5rem;
    }
    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      display: inline-block;
      transition: all 0.25s;
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(232,69,30,0.25);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      transform: translateY(-2px);
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border: none;
      font-weight: 700;
    }
    /* Hero */
    .hero {
      padding-top: calc(var(--header-height) + 40px);
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-content {
      flex: 1;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
    }
    .hero .highlight {
      color: var(--primary);
    }
    .hero p {
      font-size: 18px;
      color: var(--text-sub);
      margin: 1.5rem 0 2rem;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 360px;
      box-shadow: var(--shadow-card-hover);
      background-blend-mode: overlay;
      background-color: rgba(250,247,242,0.3);
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 32px;
        line-height: 40px;
      }
      .hero-image {
        width: 100%;
        min-height: 260px;
      }
    }
    /* 卡片网格 */
    .grid-3, .grid-2 {
      display: grid;
      gap: 24px;
    }
    .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-2, .grid-3 { grid-template-columns: 1fr; } }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
      border: 1px solid var(--border);
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
    }
    .card-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    .pain-card {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .icon-circle {
      background: rgba(232,69,30,0.08);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--primary);
    }
    .data-highlight {
      font-size: 48px;
      font-weight: 700;
      color: var(--success);
      font-family: var(--font-num);
    }
    .testimonial-card {
      background: #F5F2ED;
    }
    .quote-icon {
      color: var(--primary);
      font-size: 2rem;
    }
    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: #ccc;
      border-radius: 50%;
      margin-right: 12px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-sub);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      margin-top: 12px;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    /* CTA 区 */
    .cta-full {
      background: var(--primary);
      color: white;
      border-radius: 24px;
      text-align: center;
      padding: 70px 20px;
    }
    .cta-full h2 {
      color: white;
    }
    .form-inline {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 24px;
    }
    .form-inline input {
      padding: 14px 16px;
      border-radius: 6px;
      border: none;
      outline: none;
      flex: 1;
      min-width: 200px;
    }
    /* footer */
    .footer {
      background: var(--dark);
      color: #ddd;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; } }
    .footer a {
      color: #ccc;
      text-decoration: none;
    }