/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --primary-dark: #141829;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF4D6D;
      --neutral-bg: #F8FAFC;
      --text-main: #0A0E27;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-light: #F1F5F9;
      --card-bg: #FFFFFF;
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-default: 0 1px 3px rgba(10,14,39,0.04), 0 1px 2px rgba(10,14,39,0.06);
      --shadow-glow: 0 10px 25px rgba(0,240,255,0.15), 0 4px 10px rgba(10,14,39,0.1);
      --shadow-cta: 0 8px 20px rgba(255,77,109,0.4);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Pro Display", sans-serif;
      --transition-smooth: all 0.25s ease;
      --container-width: 1280px;
      --header-height: 80px;
      --mobile-header-height: 64px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      line-height: 1.6;
      color: var(--text-body);
      background-color: #fff;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 600;
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: 56px;
      line-height: 1.2;
      font-weight: 700;
    }

    h2 {
      font-size: 40px;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 28px;
      line-height: 1.35;
    }

    p {
      font-size: 18px;
      line-height: 1.7;
      color: var(--text-body);
      margin-bottom: 1rem;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      font-size: 16px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition-smooth);
      cursor: pointer;
      border: 2px solid transparent;
      letter-spacing: 0.3px;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--accent-pink);
      color: #fff;
      border-color: var(--accent-pink);
    }

    .btn-primary:hover {
      background-color: #e63e5a;
      border-color: #e63e5a;
      transform: scale(1.04);
      box-shadow: var(--shadow-cta);
    }

    .btn-outline {
      background: transparent;
      color: #fff;
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      transform: scale(1.04);
      box-shadow: 0 4px 12px rgba(0,240,255,0.25);
    }

    .btn-white-outline {
      background: transparent;
      color: #fff;
      border-color: #fff;
    }

    .btn-white-outline:hover {
      background: rgba(255,255,255,0.15);
      transform: scale(1.04);
    }

    /* 导航栏 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      z-index: 1000;
      display: flex;
      align-items: center;
      background: transparent;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
    }

    #header.scrolled {
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: #fff;
      letter-spacing: 0.5px;
    }

    .logo i {
      font-size: 28px;
      color: var(--accent-cyan);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: #fff;
      font-weight: 500;
      font-size: 16px;
      opacity: 0.85;
      transition: opacity 0.2s, color 0.2s;
    }

    .nav-links a:hover {
      opacity: 1;
      color: var(--accent-cyan);
    }

    .nav-cta {
      margin-left: 16px;
      padding: 10px 24px !important;
      background: var(--accent-pink);
      border-radius: var(--radius-sm);
      color: #fff !important;
      opacity: 1 !important;
    }

    .nav-cta:hover {
      background: #e63e5a !important;
      color: #fff !important;
    }

    .hamburger {
      display: none;
      font-size: 26px;
      color: #fff;
      cursor: pointer;
    }

    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary-deep);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      z-index: 999;
      gap: 32px;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      color: #fff;
      font-size: 22px;
      font-weight: 500;
    }

    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      color: #fff;
    }

    /* 板块通用 */
    section {
      padding: 120px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }

    .bg-dark {
      background-color: var(--primary-deep);
      color: var(--text-light);
    }

    .bg-neutral {
      background-color: var(--neutral-bg);
    }

    /* Hero */
    #hero {
      height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') no-repeat center center/cover;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
    }

    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10,14,39,0.75);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      color: #fff;
    }

    .hero-content h1 {
      color: #fff;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 22px;
      opacity: 0.9;
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      margin-top: 40px;
    }

    .pain-item {
      border-top: 2px solid var(--accent-pink);
      padding-top: 24px;
    }

    .pain-item i {
      font-size: 28px;
      color: var(--accent-pink);
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

    .solution-img {
      flex:1;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-default);
    }

    .solution-text {
      flex:1;
    }

    /* 优势卡片 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .adv-card {
      background: var(--card-bg);
      padding: 40px 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      transition: var(--transition-smooth);
      text-align: center;
    }

    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
      border-color: var(--accent-cyan);
    }

    .adv-number {
      font-family: var(--font-mono);
      font-size: 64px;
      font-weight: 800;
      color: var(--accent-cyan);
      line-height: 1;
      transition: color 0.2s;
    }

    .adv-card:hover .adv-number {
      color: var(--accent-pink);
    }

    /* 成果数据 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }

    .result-item .big-number {
      font-family: var(--font-mono);
      font-size: 58px;
      font-weight: 800;
      color: var(--accent-cyan);
    }

    /* 证言轮播 */
    .testimonial-card {
      background: #fff;
      max-width: 700px;
      margin: 0 auto;
      padding: 40px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-default);
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .testimonial-avatar {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: #eee;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #475569;
    }

    /* 页脚 */
    footer {
      background: var(--primary-deep);
      color: #94A3B8;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 44px; }
      .pain-grid, .adv-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .pain-grid, .adv-grid, .results-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .testimonial-card { flex-direction: column; }
    }