/* roulang page: index */
/* ----- CSS 变量与全局重置 ----- */
    :root {
      --primary: #0A0E17;
      --accent: #E94057;
      --energy: #00E5FF;
      --surface: #141B26;
      --border: #1F2937;
      --muted: #6B7280;
      --text-primary: #F3F4F6;
      --text-secondary: #9CA3AF;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-display: "DIN Alternate", "Bebas Neue", "Oswald", sans-serif;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 8px 40px rgba(233,64,87,0.15);
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition: 0.25s ease;
      --container-max: 1200px;
      --section-gap: 120px;
      --section-gap-mobile: 80px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      background-color: var(--primary);
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--primary);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }
    
    /* 排版基础 */
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      line-height: 1.3;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, input, textarea {
      font-family: inherit;
      outline: none;
    }
    
    /* ----- 导航栏 (沉浸式) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s, background 0.3s;
      padding: 0 20px;
    }
    
    .site-header.scrolled {
      border-bottom: 1px solid var(--accent);
      box-shadow: 0 2px 10px rgba(233,64,87,0.2);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      height: 70px;
    }
    
    .logo {
      font-family: var(--font-title);
      font-weight: 900;
      font-size: 1.8rem;
      color: var(--text-primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 2rem;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--energy);
    }
    
    .nav-cta {
      background: var(--accent);
      color: white !important;
      padding: 8px 20px;
      border-radius: 6px;
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .nav-cta:hover {
      background: #ff5a75;
      box-shadow: 0 0 15px rgba(233,64,87,0.6);
    }
    
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--text-primary);
      cursor: pointer;
      background: none;
      border: none;
    }
    
    /* 移动端导航抽屉 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--surface);
      backdrop-filter: blur(20px);
      padding: 24px;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 1100;
      display: flex;
      flex-direction: column;
      gap: 28px;
      border-left: 1px solid var(--border);
    }
    .mobile-drawer.open {
      transform: translateX(0);
    }
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 2rem;
    }
    .mobile-drawer a {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--text-primary);
      padding: 12px 0;
      border-bottom: 1px solid var(--border);
    }
    
    /* ----- 板块通用 ----- */
    section {
      padding: var(--section-gap) 0;
    }
    
    .section-title {
      font-size: 2.5rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
    }
    
    /* ----- Hero 首屏 ----- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 100px;
      background: radial-gradient(circle at 80% 20%, rgba(233,64,87,0.08) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
      position: relative;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 900;
      letter-spacing: -1px;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      border: none;
      transition: all 0.2s;
      box-shadow: 0 4px 14px rgba(233,64,87,0.4);
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #ff5a75;
      box-shadow: 0 0 20px rgba(233,64,87,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--accent);
      color: white;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 420px;
      width: 100%;
      position: relative;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .floating-badge {
      position: absolute;
      bottom: 20px;
      left: -20px;
      background: var(--surface);
      border-left: 4px solid var(--energy);
      padding: 12px 18px;
      border-radius: 8px;
      color: var(--energy);
      font-weight: bold;
    }
    
    /* 品牌实力网格 */
    .strength-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
      margin-top: 20px;
    }
    .strength-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      transition: all var(--transition);
    }
    .strength-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-hover);
    }
    .strength-icon {
      font-size: 2.8rem;
      color: var(--energy);
      margin-bottom: 16px;
    }
    .strength-number {
      font-family: var(--font-display);
      font-size: 2.5rem;
      color: var(--accent);
    }
    
    /* 核心业务杂志分栏 */
    .business-layout {
      display: flex;
      gap: 28px;
      align-items: flex-start;
    }
    .business-wide {
      flex: 0 0 60%;
    }
    .business-narrow {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .biz-card {
      background: var(--surface);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
    }
    .biz-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .biz-content {
      padding: 24px;
    }
    
    /* 冠军案例瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--surface);
      border-radius: var(--radius-lg);
      overflow: hidden;
      position: relative;
    }
    .masonry-item img {
      width: 100%;
      display: block;
    }
    .masonry-overlay {
      position: absolute;
      bottom: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      color: white;
      padding: 20px;
      width: 100%;
    }
    
    /* 合作方案对比 */
    .plans-row {
      display: flex;
      gap: 24px;
      align-items: flex-end;
    }
    .plan-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px;
      flex: 1;
    }
    .plan-card.recommended {
      background: var(--accent);
      border-color: var(--accent);
      transform: scale(1.03);
      box-shadow: 0 15px 30px rgba(233,64,87,0.25);
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    
    /* 终章 CTA */
    .cta-section {
      background: #080C14;
      text-align: center;
      padding: 80px 0;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .cta-form input {
      padding: 14px;
      background: var(--surface);
      border: 1px solid var(--border);
      color: white;
      border-radius: 6px;
      width: 200px;
    }
    
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
    }
    
    @media (max-width: 1024px) {
      .hero .container { flex-direction: column; }
      .business-layout { flex-direction: column; }
      .masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .strength-grid { grid-template-columns: 1fr 1fr; }
      .plans-row { flex-direction: column; }
    }
    @media (max-width: 520px) {
      .masonry { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
    }