/* roulang page: index */
:root {
      --primary: #0A1A2F;
      --accent: #00E676;
      --highlight: #FFB300;
      --bg-deep: #060E18;
      --bg-card: #0F1B2D;
      --text-main: #E0E6ED;
      --text-muted: #8899AA;
      --text-white: #FFFFFF;
      --glass-bg: rgba(15, 27, 45, 0.65);
      --glass-border: rgba(0, 230, 118, 0.15);
      --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --font-h1: 2.75rem;
      --font-h2: 2rem;
      --font-h3: 1.5rem;
      --font-number: 3.5rem;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-main);
      margin: 0;
      line-height: 1.7;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .nav-logo {
      color: var(--text-white);
      font-weight: 700;
    }

    a {
      color: var(--accent);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: #33ff99;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 玻璃拟态基础 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      box-shadow: var(--shadow-lg);
      border-radius: var(--radius-card);
    }

    .glass-input {
      background: rgba(15, 27, 45, 0.55);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-input);
      color: var(--text-white);
      padding: 0.75rem 1rem;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .glass-input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.25);
    }

    .glass-input::placeholder {
      color: #556677;
    }

    /* 导航 */
    .glass-nav {
      background: rgba(10, 26, 47, 0.45);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 230, 118, 0.15);
      box-shadow: 0 4px 20px rgba(0,0,0,0.25);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .glass-nav.scrolled {
      background: rgba(6, 14, 24, 0.92);
      backdrop-filter: blur(20px);
      box-shadow: 0 6px 24px rgba(0, 0, 0, 0.6);
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-white) !important;
      letter-spacing: -0.3px;
    }
    .navbar-brand span {
      color: var(--accent);
    }

    .nav-link {
      color: var(--text-muted) !important;
      font-weight: 500;
      margin: 0 0.25rem;
      position: relative;
      transition: color 0.2s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: linear-gradient(90deg, var(--accent), #66ffa6);
      transition: width 0.3s ease;
    }

    .nav-link:hover {
      color: var(--text-white) !important;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-glow {
      background: var(--accent);
      color: #0A1A2F;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      box-shadow: 0 0 18px rgba(0, 230, 118, 0.5);
      transition: all 0.25s;
      letter-spacing: 0.3px;
      min-width: 44px;
      min-height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .btn-glow:hover {
      background: #19f68c;
      box-shadow: 0 0 28px rgba(0, 230, 118, 0.8);
      color: #0A1A2F;
      transform: translateY(-1px);
    }

    .btn-outline-glow {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      backdrop-filter: blur(8px);
      transition: all 0.25s;
      min-width: 44px;
      min-height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline-glow:hover {
      background: rgba(0, 230, 118, 0.1);
      border-color: #33ff99;
      color: #fff;
    }

    /* Hero区域 */
    .hero-section {
      background: linear-gradient(135deg, rgba(6,14,24,0.7) 0%, rgba(10,26,47,0.65) 100%), 
                  url('/assets/images/backpic/hero-bg.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-title {
      font-size: var(--font-h1);
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    .hero-sub {
      color: var(--text-muted);
      font-size: 1.25rem;
      max-width: 600px;
    }

    .score-mock-card {
      background: rgba(15, 27, 45, 0.7);
      backdrop-filter: blur(18px);
      border-radius: 28px;
      border: 1px solid rgba(255,255,255,0.15);
      padding: 1.5rem;
      box-shadow: 0 30px 45px rgba(0,0,0,0.6);
    }

    .big-number {
      font-size: var(--font-number);
      font-weight: 800;
      background: linear-gradient(180deg, #00E676 0%, #FFB300 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.1;
    }

    .section-title {
      font-size: var(--font-h2);
      font-weight: 700;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--accent);
      border-radius: 4px;
    }

    .data-dot {
      width: 8px;
      height: 8px;
      background: var(--highlight);
      border-radius: 50%;
      display: inline-block;
      margin-right: 8px;
    }

    /* 卡片悬浮 */
    .hover-lift {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .hover-lift:hover {
      transform: translateY(-8px);
      box-shadow: 0 24px 38px rgba(0,0,0,0.55);
    }

    /* FAQ手风琴覆盖 */
    .accordion-button {
      background: transparent !important;
      color: var(--text-white) !important;
      font-weight: 600;
      box-shadow: none;
      border: none;
      padding: 1.2rem 1.5rem;
      transition: 0.2s;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,230,118,0.08) !important;
      border-left: 4px solid var(--accent);
      box-shadow: none;
    }
    .accordion-item {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px;
      margin-bottom: 0.8rem;
      overflow: hidden;
    }
    .accordion-body {
      color: #B0BEC5;
      background: rgba(0,0,0,0.15);
    }

    footer a {
      color: var(--text-muted);
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 992px) {
      :root {
        --font-h1: 2.2rem;
        --font-h2: 1.8rem;
        --font-number: 2.8rem;
      }
      .hero-section {
        min-height: 70vh;
      }
    }

    @media (max-width: 576px) {
      .hero-title {
        font-size: 2rem;
      }
      .navbar-brand {
        font-size: 1.2rem;
      }
    }