/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-deep: #0B1A2F;
      --accent-signal: #00E5A0;
      --bg-light: #F4F6F9;
      --cta-warm: #FF5E3A;
      --cta-hover: #E04A2E;
      --text-body: #1A1A2E;
      --text-muted: #5B6C84;
      --card-white: #FFFFFF;
      --shadow-sm: 0 4px 24px rgba(11,26,47,0.06);
      --shadow-hover: 0 12px 32px rgba(11,26,47,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --radius-dock: 40px;
      --font-head: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition-smooth: 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-head);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-head);
      color: var(--primary-deep);
    }
    
    a {
      text-decoration: none;
      transition: color var(--transition-smooth);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 容器与板块间距 */
    .section-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    section {
      padding: 100px 0;
    }
    
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }
    
    /* 板块标题装饰 */
    .section-label {
      font-size: 14px;
      font-weight: 600;
      letter-spacing: 1px;
      color: var(--accent-signal);
      text-transform: uppercase;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .section-label::before {
      content: '';
      display: inline-block;
      width: 32px;
      height: 2px;
      background: var(--accent-signal);
    }
    h2 {
      font-size: 36px;
      line-height: 1.25;
      font-weight: 700;
      margin-top: 0;
      margin-bottom: 24px;
    }
    @media (max-width: 640px) {
      h2 {
        font-size: 28px;
      }
    }
    
    /* ----- 浮动导航 Dock ----- */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 620px;
      background: rgba(11, 26, 47, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: var(--radius-dock);
      padding: 8px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      box-shadow: 0 8px 30px rgba(0,0,0,0.25);
      transition: all var(--transition-smooth);
    }
    
    .nav-logo {
      font-weight: 800;
      font-size: 1.3rem;
      color: white;
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .nav-logo span {
      color: var(--accent-signal);
    }
    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .nav-links a {
      color: #B0C4DE;
      font-weight: 500;
      font-size: 15px;
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-signal);
      border-bottom-color: var(--accent-signal);
    }
    .nav-cta {
      background: var(--accent-signal);
      color: var(--primary-deep) !important;
      border-radius: 30px;
      padding: 8px 18px !important;
      font-weight: 700;
      font-size: 14px;
      border-bottom: none !important;
      transition: background 0.2s;
    }
    .nav-cta:hover {
      background: #00cc8c;
      color: var(--primary-deep) !important;
    }
    
    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: rgba(11,26,47,0.96);
        backdrop-filter: blur(20px);
        border-radius: 24px;
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.3);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-dock {
        justify-content: space-between;
      }
    }
    
    /* ----- 按钮系统 ----- */
    .btn-primary {
      background: var(--cta-warm);
      color: white !important;
      font-weight: 700;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 6px 18px rgba(255,94,58,0.3);
      min-width: 140px;
    }
    .btn-primary:hover {
      background: var(--cta-hover);
      box-shadow: 0 8px 22px rgba(255,94,58,0.45);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--accent-signal);
      border: 2px solid var(--accent-signal);
      font-weight: 700;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: 0.25s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--accent-signal);
      color: var(--primary-deep);
    }
    
    @media (max-width: 640px) {
      .btn-primary, .btn-outline {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
        min-height: 48px;
      }
    }
    
    /* ----- Hero 区域 ----- */
    .hero {
      background: var(--bg-light);
      position: relative;
      overflow: hidden;
      padding-top: 140px;
      padding-bottom: 80px;
    }
    .hero-bg-ripple {
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0,229,160,0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .phone-mockup {
      width: 260px;
      height: 520px;
      background: var(--primary-deep);
      border-radius: 36px;
      padding: 12px;
      box-shadow: 0 30px 50px rgba(0,0,0,0.2);
      position: relative;
      border: 2px solid rgba(255,255,255,0.1);
    }
    .phone-screen {
      background: #1e2a3a;
      border-radius: 26px;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-signal);
      font-size: 28px;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .signal-wave {
      position: absolute;
      bottom: 20px;
      left: 20px;
      color: var(--accent-signal);
      font-size: 20px;
      opacity: 0.8;
    }
    
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .phone-mockup {
        width: 200px;
        height: 400px;
        margin-top: 20px;
      }
    }
    
    /* 优势卡片不对称布局 */
    .advantages-grid {
      display: flex;
      gap: 30px;
      align-items: stretch;
    }
    .adv-left-card {
      flex: 1 1 45%;
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent-signal);
      transition: var(--transition-smooth);
    }
    .adv-right-stack {
      flex: 1 1 50%;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .adv-small-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
    }
    .icon-accent {
      font-size: 40px;
      color: var(--accent-signal);
      margin-bottom: 16px;
    }
    
    @media (max-width: 768px) {
      .advantages-grid {
        flex-direction: column;
      }
    }
    
    /* 产品交错卡片 */
    .product-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
    }
    .product-img {
      flex: 0 0 48%;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .product-text {
      flex: 1;
    }
    .reverse {
      flex-direction: row-reverse;
    }
    @media (max-width: 768px) {
      .product-row, .reverse {
        flex-direction: column;
      }
    }
    
    /* 流程时间轴 */
    .steps-line {
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 40px;
    }
    .steps-line::before {
      content: '';
      position: absolute;
      top: 35px;
      left: 5%;
      width: 90%;
      height: 2px;
      background: var(--accent-signal);
      z-index: 0;
    }
    .step-item {
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
      z-index: 1;
      box-shadow: var(--shadow-sm);
      flex: 1;
      margin: 0 8px;
      position: relative;
    }
    .step-num {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      color: var(--accent-signal);
    }
    @media (max-width: 768px) {
      .steps-line {
        flex-direction: column;
        gap: 20px;
      }
      .steps-line::before {
        display: none;
      }
    }
    
    /* FAQ 手风琴自定义 */
    .accordion-item {
      border-bottom: 1px solid #ddd;
    }
    .accordion-title {
      background: #F4F6F9;
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      border-radius: 8px;
      margin-bottom: 4px;
      transition: 0.2s;
    }
    .accordion-title:hover {
      background: #e9edf2;
    }
    .accordion-content {
      padding: 0 24px 18px;
      background: white;
      border-left: 3px solid var(--accent-signal);
    }
    
    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer a {
      color: #B0C4DE;
    }