/* roulang page: index */
:root {
      --deep-black: #0A0E17;
      --flame-orange: #FF4D00;
      --flame-orange-light: #FF6A20;
      --dark-blue-gray: #2B2F3A;
      --light-gray: #F2F2F2;
      --mid-gray: #A0A5B0;
      --neon-green: #00E676;
      --card-bg: #1A1E26;
      --card-border: rgba(255, 77, 0, 0.15);
      --card-border-hover: rgba(255, 77, 0, 0.5);
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
      --radius-card: 12px;
      --radius-btn: 6px;
      --transition-bounce: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --transition-smooth: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Roboto", sans-serif;
      --max-width: 1280px;
      --section-padding: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-black);
      color: var(--light-gray);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 沉浸式导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 77, 0, 0.3);
      z-index: 1000;
      transition: var(--transition-smooth);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      height: 70px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--light-gray);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--flame-orange), #FF8A00);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--deep-black);
      font-weight: 900;
      font-size: 1.2rem;
      box-shadow: 0 0 12px rgba(255, 77, 0, 0.5);
    }

    .logo-text {
      color: var(--flame-orange);
      letter-spacing: 0.02em;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--light-gray);
      text-decoration: none;
      font-weight: 500;
      position: relative;
      padding: 6px 0;
      font-size: 0.95rem;
      letter-spacing: 0.01em;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0%;
      height: 2px;
      background: var(--flame-orange);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--flame-orange);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--flame-orange);
      color: var(--deep-black) !important;
      padding: 10px 24px !important;
      border-radius: 30px;
      font-weight: 700;
      letter-spacing: 0.03em;
      box-shadow: 0 0 15px rgba(255, 77, 0, 0.5);
      transition: all 0.3s;
    }

    .nav-cta:hover {
      background: var(--flame-orange-light);
      box-shadow: 0 0 22px rgba(255, 77, 0, 0.8);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 0;
      z-index: 1100;
    }

    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--light-gray);
      transition: 0.3s;
      border-radius: 2px;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: rgba(10, 14, 23, 0.95);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      padding: 100px 40px 40px;
      gap: 28px;
      transition: right 0.4s ease;
      z-index: 1050;
      border-left: 1px solid rgba(255, 77, 0, 0.2);
    }

    .mobile-menu.active {
      right: 0;
    }

    .mobile-menu a {
      color: var(--light-gray);
      font-size: 1.4rem;
      font-weight: 600;
      text-decoration: none;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .mobile-menu .mobile-cta {
      color: var(--flame-orange);
      font-weight: 700;
    }

    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(255,77,0,0.15) 0%, transparent 50%), 
                  url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      position: relative;
    }

    .hero-content {
      max-width: 800px;
      margin-top: 30px;
    }

    .hero h1 {
      font-size: 3.8rem;
      font-weight: 900;
      letter-spacing: -0.02em;
      line-height: 1.15;
      color: white;
      margin-bottom: 24px;
      text-shadow: 0 0 30px rgba(255,77,0,0.4);
    }

    .hero .highlight {
      color: var(--flame-orange);
    }

    .hero p {
      font-size: 1.25rem;
      color: var(--mid-gray);
      margin-bottom: 40px;
      max-width: 600px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--flame-orange);
      color: var(--deep-black);
      font-weight: 700;
      letter-spacing: 0.05em;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s;
      border: none;
      cursor: pointer;
      font-size: 1rem;
      text-transform: uppercase;
      box-shadow: 0 0 18px rgba(255, 77, 0, 0.5);
    }

    .btn-primary:hover {
      background: var(--flame-orange-light);
      box-shadow: 0 0 28px rgba(255, 77, 0, 0.8);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid var(--flame-orange);
      color: var(--flame-orange);
      font-weight: 700;
      letter-spacing: 0.05em;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      transition: all 0.3s;
      text-transform: uppercase;
    }

    .btn-secondary:hover {
      background: var(--flame-orange);
      color: var(--deep-black);
    }

    /* 板块通用 */
    .section {
      padding: var(--section-padding) 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.01em;
      color: white;
    }

    .section-desc {
      color: var(--mid-gray);
      max-width: 700px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition-bounce);
      box-shadow: var(--shadow-card);
    }

    .card:hover {
      border-color: var(--card-border-hover);
      transform: translateY(-6px);
      box-shadow: 0 16px 32px rgba(0,0,0,0.6);
    }

    .card-icon {
      font-size: 2rem;
      color: var(--flame-orange);
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .numbers {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
    }

    .stat h4 {
      font-size: 2.8rem;
      color: var(--neon-green);
      font-weight: 800;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .footer {
      background: #05070A;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.5rem; }
      .grid-3 { grid-template-columns: 1fr; }
    }