/* roulang page: index */
:root {
      --primary-deep: #0A0E17;
      --primary-bg: #0F1419;
      --secondary-bg: #141B22;
      --card-bg: #1A202C;
      --accent-red: #E62E2E;
      --accent-red-hover: #C41E1E;
      --accent-gold: #FFB800;
      --white: #F2F2F2;
      --gray: #A0AEC0;
      --gray-muted: #7A8290;
      --border-subtle: rgba(255, 255, 255, 0.06);
      --border-hover: rgba(230, 46, 46, 0.5);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.5);
      --font-main: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Oswald', 'DIN Alternate', 'Impact', sans-serif;
      --max-width: 1280px;
      --header-height: 72px;
      --transition-default: all 0.2s ease;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }

    body {
      font-family: var(--font-main);
      background-color: var(--primary-bg);
      color: var(--white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-main);
      border: none;
      outline: none;
      transition: var(--transition-default);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 700;
    }

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

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .header.scrolled {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--header-height);
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 900;
      font-size: 1.6rem;
      color: var(--white);
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--accent-red), #b30000);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--accent-gold);
      transform: rotate(0deg);
      box-shadow: 0 2px 10px rgba(230,46,46,0.4);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 12px;
      list-style: none;
    }

    .nav-link {
      display: block;
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 500;
      background: rgba(255,255,255,0.06);
      color: var(--gray);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .nav-link:hover,
    .nav-link:focus-visible {
      background: var(--accent-red);
      color: white;
      outline: none;
    }

    .burger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1001;
    }

    .burger span {
      width: 28px;
      height: 2px;
      background: var(--white);
      border-radius: 2px;
      transition: all 0.3s;
    }

    .burger.active span:nth-child(1) {
      transform: translateY(8px) rotate(45deg);
    }
    .burger.active span:nth-child(2) {
      opacity: 0;
    }
    .burger.active span:nth-child(3) {
      transform: translateY(-8px) rotate(-45deg);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      transform: translateX(100%);
      transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 1000;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-nav-links {
      list-style: none;
      text-align: center;
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .mobile-nav-links a {
      font-size: 2rem;
      font-weight: 700;
      color: var(--white);
      padding-bottom: 10px;
      border-bottom: 2px solid transparent;
    }

    .mobile-nav-links a:hover {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-red);
    }

    /*区块通用*/
    section {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
      .container {
        padding: 0 16px;
      }
    }

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

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, transparent 10%, var(--primary-deep) 90%);
      opacity: 0.85;
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 780px;
      margin-left: 5%;
    }

    .hero h1 {
      font-size: clamp(36px, 5vw, 64px);
      font-weight: 900;
      color: var(--accent-gold);
      text-shadow: 2px 2px 12px rgba(230,46,46,0.6);
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--gray);
      max-width: 600px;
      margin-bottom: 32px;
    }

    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1.1rem;
      box-shadow: 0 4px 15px rgba(230,46,46,0.4);
    }

    .btn-primary:hover {
      background: var(--accent-red-hover);
    }

    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      right: 40px;
      z-index: 2;
      opacity: 0.7;
      animation: bounce 2s infinite;
      font-size: 1.8rem;
      color: var(--accent-gold);
    }

    @keyframes bounce {
      0%,100%{transform:translateY(0);}
      50%{transform:translateY(-8px);}
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 2fr;
      gap: 24px;
    }

    .pain-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-subtle);
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }

    .pain-icon {
      color: var(--accent-red);
      font-size: 2rem;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }

    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      transition: var(--transition-default);
      position: relative;
      box-shadow: var(--shadow-card);
    }

    .solution-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-hover);
    }

    .solution-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .solution-text {
      padding: 24px;
      border-top: 3px solid var(--accent-red);
    }

    /* 成果数字 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: clamp(40px,6vw,72px);
      font-weight: 800;
      color: var(--accent-gold);
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }

    .testimonial-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      border-left: 4px solid var(--accent-red);
    }

    .avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background-size: cover;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .faq-question {
      width: 100%;
      background: transparent;
      color: var(--white);
      padding: 24px 8px;
      font-size: 1.1rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--gray);
      padding-left: 8px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* 最终CTA */
    .cta-final {
      background: linear-gradient(135deg, var(--primary-deep) 0%, #1a0f0f 100%);
      text-align: center;
      position: relative;
    }

    .btn-gold {
      background: var(--accent-gold);
      color: #000;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
    }

    /* 页脚 */
    .footer {
      background: #060A0F;
      padding-top: 60px;
      border-top: 2px solid var(--accent-red);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .burger { display: flex; }
      .pain-grid, .solution-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-content { margin-left: 0; text-align: center; }
    }