/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-red: #D42027;
      --deep-black: #0F0F0F;
      --champion-gold: #C9A96E;
      --soft-white: #F8F8F8;
      --light-gray: #F0F0F0;
      --card-white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --border-light: #E5E5E5;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
      --radius-btn: 4px;
      --radius-card: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-number: 'DIN Alternate', 'Roboto', sans-serif;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-title);
      background-color: var(--soft-white);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航样式 */
    .navbar {
      position: sticky;
      top: 0;
      background: white;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid #f0f0f0;
      z-index: 50;
      padding: 0 20px;
    }
    .nav-inner {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 900;
      color: var(--primary-red);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-link {
      font-weight: 500;
      color: var(--deep-black);
      transition: color 0.2s;
      font-size: 16px;
    }
    .nav-link:hover {
      color: var(--primary-red);
    }
    .btn-primary-nav {
      background: var(--primary-red);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary-nav:hover {
      background: #B01C23;
      transform: translateY(-2px);
    }
    /* 移动端菜单按钮 */
    .hamburger {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--deep-black);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--deep-black);
      flex-direction: column;
      padding: 80px 30px 30px;
      transition: right 0.3s ease;
      z-index: 100;
      display: flex;
      gap: 2rem;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu .nav-link {
      color: white;
      font-size: 20px;
    }
    .mobile-menu .btn-primary-nav {
      width: fit-content;
    }
    .close-menu {
      position: absolute;
      top: 20px;
      right: 20px;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }
    /* Hero 区域 */
    .hero-section {
      height: 100vh;
      min-height: 650px;
      background: linear-gradient(135deg, rgba(212,32,39,0.75) 0%, rgba(15,15,15,0.65) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero-grid {
      display: flex;
      flex-wrap: wrap;
      width: 100%;
    }
    .hero-left {
      flex: 1 1 50%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      color: white;
    }
    .hero-right {
      flex: 1 1 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .data-card {
      background: rgba(15, 15, 15, 0.8);
      backdrop-filter: blur(10px);
      padding: 2.5rem;
      border-radius: 12px;
      width: 100%;
      max-width: 380px;
      color: white;
      border: 1px solid rgba(201,169,110,0.3);
    }
    .data-item {
      margin-bottom: 1.8rem;
    }
    .data-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--champion-gold);
      text-shadow: 0 0 8px rgba(201,169,110,0.5);
    }
    .data-label {
      font-size: 14px;
      color: #ccc;
      letter-spacing: 1px;
    }
    .hero-title {
      font-size: 56px;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 20px;
      opacity: 0.9;
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-hero-primary {
      background: var(--primary-red);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      transition: var(--transition-smooth);
    }
    .btn-hero-primary:hover {
      background: #B01C23;
      transform: translateY(-2px);
    }
    .btn-hero-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: var(--transition-smooth);
    }
    .btn-hero-outline:hover {
      background: rgba(255,255,255,0.15);
    }
    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 3px;
      background: var(--champion-gold);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 3rem;
    }
    /* 核心优势三列 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 4fr 4fr 4fr;
      gap: 2rem;
    }
    .adv-card {
      background: white;
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-bottom: 3px solid var(--primary-red);
      transition: var(--transition-smooth);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 2.5rem;
      color: var(--champion-gold);
      margin-bottom: 1.2rem;
    }
    .stack-cards {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }
    /* 数据看板深色条 */
    .data-band {
      background: var(--deep-black);
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .metric-value {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: var(--champion-gold);
    }
    .metric-label {
      color: #aaa;
      font-size: 14px;
      letter-spacing: 1px;
    }
    /* 对比区 */
    .compare-wrapper {
      display: flex;
      flex-wrap: wrap;
      background: white;
      box-shadow: var(--shadow-sm);
    }
    .compare-left {
      flex: 1 1 40%;
      background: #f4f4f4;
      padding: 4rem 2.5rem;
    }
    .compare-right {
      flex: 1 1 60%;
      padding: 4rem 2.5rem;
      background: white;
    }
    .compare-list {
      list-style: none;
      margin-top: 2rem;
    }
    .compare-list li {
      margin-bottom: 1.2rem;
      font-size: 17px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .icon-red {
      color: var(--primary-red);
    }
    .icon-gold {
      color: var(--champion-gold);
    }
    /* FAQ */
    .faq-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 3rem;
    }
    .faq-left {
      flex: 1 1 35%;
    }
    .faq-right {
      flex: 1 1 60%;
    }
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      margin-top: 0.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }
    .faq-item.active .faq-question {
      color: var(--primary-red);
    }
    /* CTA 深色区 */
    .cta-dark {
      background: var(--deep-black);
      background-image: radial-gradient(circle at 30% 30%, #2a2a2a 1px, transparent 1px);
      background-size: 40px 40px;
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-form {
      display: flex;
      max-width: 500px;
      margin: 2rem auto 1rem;
      gap: 10px;
    }
    .cta-input {
      flex: 1;
      padding: 14px 20px;
      border-radius: 4px;
      border: 1px solid #555;
      background: white;
      font-size: 16px;
    }
    .cta-input:focus {
      outline: none;
      border-color: var(--champion-gold);
    }
    .btn-cta {
      background: var(--primary-red);
      border: none;
      color: white;
      padding: 0 32px;
      font-weight: 700;
      border-radius: 4px;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-cta:hover {
      background: #B01C23;
    }
    .trust-text {
      color: #aaa;
      font-size: 14px;
    }
    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 900;
      color: white;
    }
    .footer a:hover {
      color: var(--champion-gold);
    }
    .footer-bottom {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      font-size: 14px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 42px; }
      .advantage-grid { grid-template-columns: 1fr 1fr; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-section { height: auto; padding: 100px 0 60px; }
      .hero-grid { flex-direction: column; }
      .hero-right { margin-top: 2rem; }
      .advantage-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .faq-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cta-form { flex-direction: column; }
      .btn-group { flex-direction: column; width: 100%; }
    }
    @media (max-width: 520px) {
      .hero-title { font-size: 32px; }
      .section-title { font-size: 30px; }
      .metrics-grid { grid-template-columns: 1fr; }
    }