/* roulang page: index */
:root {
      --deep-blue: #0A0F24;
      --cyan: #00E5FF;
      --orange: #FF6B35;
      --neutral-light: #F0F2F5;
      --neutral-mid: #B0B8C1;
      --neutral-dark: #2A2F3A;
      --neutral-darker: #141822;
      --glass-bg: rgba(10, 20, 40, 0.6);
      --glass-border: rgba(0, 229, 255, 0.15);
      --card-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 229, 255, 0.5);
      --glow-cyan-hover: 0 0 35px rgba(0, 229, 255, 0.8);
      --font-title: 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
      --font-body: 'Inter', 'Noto Sans TC', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--deep-blue);
      color: #E0E4EB;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 導航 PC */
    .glass-nav {
      background: rgba(10, 15, 36, 0.45);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
      transition: background 0.3s, backdrop-filter 0.3s;
    }
    .glass-nav.scrolled {
      background: rgba(10, 15, 36, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
    }
    .nav-link {
      color: #CDD5E0;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--cyan);
    }
    .btn-glow {
      background: var(--cyan);
      color: #0A0F24;
      font-weight: 600;
      padding: 0.6rem 1.8rem;
      border-radius: 2rem;
      box-shadow: var(--glow-cyan);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      border: none;
    }
    .btn-glow:hover {
      box-shadow: var(--glow-cyan-hover);
      transform: scale(1.02);
      background: #33EAFF;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      font-weight: 500;
      padding: 0.6rem 1.8rem;
      border-radius: 2rem;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.08);
      border-color: #66F0FF;
    }
    /* 移動端底部導航 */
    .mobile-nav-capsule {
      background: rgba(10, 15, 36, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0, 229, 255, 0.3);
      border-radius: 2rem 2rem 0 0;
      padding: 0.5rem 1rem;
      display: flex;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      color: #B0B8C1;
      font-size: 0.7rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.2rem;
      transition: color 0.2s;
    }
    .mobile-nav-item i {
      font-size: 1.2rem;
    }
    .mobile-nav-item.active {
      color: var(--cyan);
    }
    /* 玻璃擬態卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 229, 255, 0.5);
      box-shadow: 0 8px 35px rgba(0, 229, 255, 0.15);
    }
    .section-title {
      font-family: var(--font-title);
      font-weight: 600;
      letter-spacing: -0.01em;
    }
    .text-cyan {
      color: var(--cyan);
    }
    .text-orange {
      color: var(--orange);
    }
    .divider-glow {
      height: 1px;
      background: var(--cyan);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.7);
      width: 80px;
      margin: 1.5rem auto;
    }
    .count-up {
      font-weight: 700;
      color: var(--orange);
    }
    /* Hero 背景 */
    .hero-bg {
      background: radial-gradient(circle at 70% 20%, #1A2540 0%, #0A0F24 75%);
      position: relative;
    }
    .hero-bg::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: repeating-linear-gradient(0deg, rgba(0,229,255,0.02) 0px, transparent 1px, transparent 40px);
      pointer-events: none;
    }
    .floating-card {
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
      100% { transform: translateY(0); }
    }
    /* FAQ 手風琴 */
    .faq-item {
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px;
      background: rgba(20, 24, 34, 0.7);
      backdrop-filter: blur(12px);
      margin-bottom: 1rem;
      transition: border 0.2s;
    }
    .faq-item.active {
      border-color: var(--cyan);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 1.5rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }
    @media (max-width: 1023px) {
      .desktop-nav { display: none; }
      .mobile-nav { display: flex; }
    }
    @media (min-width: 1024px) {
      .mobile-nav { display: none; }
      .desktop-nav { display: flex; }
    }