/* roulang page: index */
:root {
      --brand-red: #E94057;
      --brand-cyan: #00E5FF;
      --brand-gold: #FFB800;
      --deep-bg: #0A0E27;
      --card-dark: #1A1F3A;
      --card-white: #FFFFFF;
      --gray-light: #F0F2F5;
      --text-weak: rgba(255,255,255,0.7);
      --text-strong: #FFFFFF;
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --radius-pill: 100px;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 28px rgba(233,64,87,0.35);
      --nav-width: 240px;
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--deep-bg);
      color: #E5E7EB;
      line-height: 1.6;
      display: flex;
      min-height: 100vh;
    }
    /* 左侧导航 App Shell */
    .app-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background: #0A0E27;
      border-right: 1px solid rgba(255,255,255,0.08);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      z-index: 1000;
      padding: 24px 0 20px 0;
      transition: transform 0.25s ease;
    }
    .nav-logo {
      padding: 0 24px 32px 24px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo-icon {
      font-size: 26px;
      color: var(--brand-red);
      filter: drop-shadow(0 0 6px rgba(233,64,87,0.8));
      line-height: 1;
    }
    .logo-text {
      font-weight: 700;
      font-size: 22px;
      color: white;
      letter-spacing: 1px;
    }
    .nav-menu {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: 0 16px;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      color: var(--text-weak);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      transition: all var(--transition);
    }
    .nav-item::before {
      content: '';
      position: absolute;
      left: 0;
      top: 8px;
      bottom: 8px;
      width: 3px;
      background: var(--brand-cyan);
      border-radius: 0 4px 4px 0;
      transform: scaleY(0);
      transition: transform 0.2s ease;
    }
    .nav-item:hover {
      color: white;
      background: rgba(255,255,255,0.04);
    }
    .nav-item:hover::before {
      transform: scaleY(1);
    }
    .nav-item.active {
      color: white;
      font-weight: 600;
      background: rgba(0,229,255,0.06);
    }
    .nav-item.active::before {
      transform: scaleY(1);
    }
    .nav-cta-btn {
      background: var(--brand-gold);
      color: #0A0E27;
      font-weight: 700;
      justify-content: center;
      margin: 8px 16px;
      border-radius: var(--radius-md);
      padding: 12px 16px;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: 0 4px 12px rgba(255,184,0,0.3);
    }
    .nav-cta-btn:hover {
      background: #ffc933;
      box-shadow: 0 6px 16px rgba(255,184,0,0.5);
    }
    .nav-footer {
      padding: 16px 24px 8px;
      font-size: 12px;
      color: rgba(255,255,255,0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      border-top: 1px solid rgba(255,255,255,0.05);
      margin-top: 12px;
    }
    /* 右侧主内容 */
    .main-content {
      margin-left: var(--nav-width);
      flex: 1;
      width: 100%;
      background: var(--deep-bg);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }
    section {
      padding: 80px 0;
      scroll-margin-top: 20px;
    }
    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
      letter-spacing: 0.5px;
    }
    .section-sub {
      font-size: 16px;
      color: rgba(255,255,255,0.65);
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      min-height: 88vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      margin-left: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(233,64,87,0.8) 0%, rgba(123,45,142,0.75) 100%);
      mix-blend-mode: multiply;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero .badge-float {
      position: absolute;
      right: 20px;
      top: 40px;
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(10px);
      border: 1px solid var(--brand-cyan);
      color: var(--brand-cyan);
      padding: 8px 18px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
      animation: floatBadge 3s infinite ease-in-out;
    }
    @keyframes floatBadge {
      0%{transform: translateY(0);}50%{transform: translateY(-6px);}100%{transform: translateY(0);}
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .btn-primary {
      background: linear-gradient(135deg, #E94057, #B71C3C);
      border: none;
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-md);
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: var(--shadow-glow);
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--brand-cyan);
      color: var(--brand-cyan);
      padding: 14px 34px;
      border-radius: var(--radius-md);
      font-weight: 700;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
    }
    /* 数据战绩 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-dark);
      border-radius: var(--radius-xl);
      padding: 32px 24px;
      position: relative;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
    }
    .stat-card:hover {
      box-shadow: 0 12px 28px rgba(233,64,87,0.25);
    }
    .stat-number {
      font-family: 'DIN Alternate', 'Roboto Mono', monospace;
      font-size: 52px;
      font-weight: 700;
      color: var(--brand-cyan);
      margin-bottom: 8px;
    }
    .stat-label {
      font-weight: 600;
      color: rgba(255,255,255,0.8);
    }
    .badge-corner {
      position: absolute;
      top: 16px;
      right: 16px;
      background: rgba(255,184,0,0.2);
      color: var(--brand-gold);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
    }
    /* 服务矩阵 2+1 */
    .service-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }
    .left-services {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: var(--card-white);
      color: #1F2937;
      border-radius: var(--radius-xl);
      padding: 28px;
      transition: all 0.25s;
      box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    }
    .service-card:hover {
      transform: translateY(-6px);
      border: 1px solid var(--brand-red);
    }
    .service-card img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: 16px;
      margin-bottom: 20px;
    }
    .tag-group {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: 16px;
    }
    .tag {
      background: rgba(233,64,87,0.1);
      color: #B91C3C;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .featured-card {
      background: linear-gradient(145deg, #E94057, #7B2D8E);
      color: white;
      border-radius: var(--radius-xl);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      box-shadow: var(--shadow-glow);
    }
    /* 对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-col {
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-xl);
      padding: 32px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
    }
    .progress-bg {
      width: 160px;
      height: 8px;
      background: rgba(255,255,255,0.2);
      border-radius: 10px;
    }
    .progress-fill {
      height: 8px;
      border-radius: 10px;
      background: var(--brand-cyan);
    }
    .k1-fill {
      background: linear-gradient(90deg, #E94057, #FF4655);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--card-dark);
      border-radius: var(--radius-lg);
      margin-bottom: 16px;
      padding: 18px 24px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.25s;
      color: rgba(255,255,255,0.75);
    }
    .faq-item.open .faq-answer {
      max-height: 150px;
      margin-top: 14px;
    }
    /* CTA表单 */
    .cta-wrapper {
      background: linear-gradient(135deg, #0F1535, #1A1030);
      border-radius: var(--radius-xl);
      padding: 48px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-blend-mode: overlay;
    }
    .form-card {
      background: white;
      border-radius: var(--radius-xl);
      padding: 36px;
      color: #111827;
    }
    .form-card input {
      width: 100%;
      padding: 14px;
      margin-bottom: 16px;
      border: 1px solid #E5E7EB;
      border-radius: var(--radius-sm);
      font-size: 15px;
    }
    .submit-btn {
      background: linear-gradient(135deg, #E94057, #7B2D8E);
      color: white;
      border: none;
      width: 100%;
      padding: 16px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
    }
    footer {
      padding: 32px 0;
      border-top: 1px solid rgba(255,255,255,0.08);
      color: rgba(255,255,255,0.5);
    }
    /* 移动端 */
    .mobile-header {
      display: none;
    }
    @media (max-width: 1024px) {
      .data-grid { grid-template-columns: repeat(2,1fr); }
      .service-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .app-nav { transform: translateX(-100%); }
      .app-nav.open { transform: translateX(0); }
      .main-content { margin-left: 0; }
      .mobile-header {
        display: flex;
        position: fixed;
        top:0;left:0;right:0;
        height: 56px;
        background: #0A0E27;
        align-items: center;
        justify-content: space-between;
        padding: 0 20px;
        z-index: 1100;
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
      .hamburger { font-size: 24px; color: white; background: none; border: none; }
      .hero h1 { font-size: 32px; }
      .data-grid { grid-template-columns: 1fr; }
      .compare-row { grid-template-columns: 1fr; }
      .cta-wrapper { grid-template-columns: 1fr; }
    }