/* roulang page: index */
:root {
      --bs-primary: #F15A24;
      --bs-primary-rgb: 241, 90, 36;
      --bs-secondary: #00B4D8;
      --bs-dark: #1A1D23;
      --bs-light: #F8F9FA;
      --bs-body-color: #212529;
      --bs-body-bg: #F8F9FA;
      --bs-border-radius: 12px;
      --bs-border-radius-lg: 16px;
      --bs-border-radius-sm: 8px;
      --bs-link-color: #00B4D8;
      --bs-link-hover-color: #F15A24;
      --orange-deep: #E04A1A;
      --neon-green: #39FF14;
      --gray-soft: #6C757D;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-lg: 0 16px 40px rgba(0,0,0,0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "Roboto", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: #F8F9FA;
      color: #1A1D23;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .display-4, .lead {
      font-family: var(--font-sans);
      letter-spacing: -0.02em;
    }

    a {
      text-decoration: none;
      transition: color 0.2s ease, background-color 0.2s ease;
    }

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

    /* 导航栏重塑 */
    .navbar {
      background: rgba(26, 29, 35, 0.95) !important;
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
      height: 70px;
      padding: 0 1.5rem;
    }
    .navbar-brand {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.8rem;
      color: white !important;
      letter-spacing: -0.5px;
    }
    .navbar-brand span {
      color: #F15A24;
    }
    .navbar-nav .nav-link {
      color: rgba(255,255,255,0.85) !important;
      font-weight: 500;
      margin: 0 0.4rem;
      padding: 0.5rem 0.8rem;
      position: relative;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background: #F15A24;
      transition: all 0.25s ease;
      transform: translateX(-50%);
    }
    .navbar-nav .nav-link:hover {
      color: #F15A24 !important;
    }
    .navbar-nav .nav-link:hover::after {
      width: 70%;
    }
    .btn-nav-cta {
      background: #F15A24;
      color: white;
      border-radius: 30px;
      padding: 0.55rem 1.8rem;
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      transition: all 0.3s;
      position: relative;
      margin-left: 1rem;
    }
    .btn-nav-cta:hover {
      background: #E04A1A;
      box-shadow: 0 8px 18px rgba(241,90,36,0.4);
      color: white;
    }
    .badge-pulse {
      background: #39FF14;
      width: 10px;
      height: 10px;
      display: inline-block;
      border-radius: 50%;
      margin-right: 4px;
      position: relative;
      top: -1px;
    }
    .pill-badge {
      background: rgba(57,255,20,0.15);
      color: #39FF14;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 0.2rem 0.7rem;
      border-radius: 20px;
      margin-left: 0.5rem;
      letter-spacing: 0.3px;
    }

    /* Hero区 */
    #hero {
      background: #1A1D23;
      background-image: radial-gradient(circle at 30% 40%, rgba(241,90,36,0.08) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: "";
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 2px, transparent 2px, transparent 12px);
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
    }
    .hero-title span {
      color: #F15A24;
    }
    .hero-sub {
      color: rgba(255,255,255,0.75);
      font-size: 1.15rem;
      margin: 1.5rem 0 2rem;
    }
    .btn-primary-custom {
      background: #F15A24;
      border: none;
      border-radius: 40px;
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      color: white;
      transition: 0.3s;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: #E04A1A;
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(241,90,36,0.45);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid #F15A24;
      color: #F15A24;
      border-radius: 40px;
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline-custom:hover {
      background: rgba(241,90,36,0.1);
      color: #F15A24;
    }

    /* 卡片与网格 */
    .feature-card {
      background: white;
      border-radius: 16px;
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      border: 1px solid rgba(0,0,0,0.03);
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: #00B4D8;
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(0,180,216,0.1);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #00B4D8;
      font-size: 1.8rem;
      margin-bottom: 1.2rem;
    }

    .masonry-grid {
      column-count: 3;
      column-gap: 1.8rem;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 1.8rem;
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }
    .masonry-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }
    .masonry-item img {
      transition: transform 0.4s;
    }
    .masonry-item:hover img {
      transform: scale(1.04);
    }

    .compare-card-left {
      background: #eeeeee;
      border-radius: 20px;
      padding: 2rem;
      color: #555;
    }
    .compare-card-right {
      background: white;
      border: 2px solid #F15A24;
      border-radius: 20px;
      padding: 2rem;
      box-shadow: 0 10px 28px rgba(241,90,36,0.1);
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 3rem;
      font-weight: 700;
      color: #F15A24;
    }

    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
      border-bottom: 1px solid #dee2e6;
    }
    .accordion-button:not(.collapsed) {
      background: #fff6f2;
      color: #F15A24;
      box-shadow: none;
    }
    .accordion-button::after {
      transition: transform 0.3s;
    }
    .accordion-button:not(.collapsed)::after {
      transform: rotate(45deg);
    }

    #cta-section {
      background: linear-gradient(135deg, #F15A24 0%, #e04a1a 100%);
      padding: 5rem 0;
    }

    footer {
      background: #1A1D23;
      color: #adb5bd;
    }
    footer a {
      color: #adb5bd;
    }
    footer a:hover {
      color: #F15A24;
    }

    @media (max-width: 992px) {
      .masonry-grid {
        column-count: 2;
      }
      .hero-title {
        font-size: 2.5rem;
      }
    }
    @media (max-width: 768px) {
      .navbar-nav {
        background: #1A1D23;
        padding: 1rem;
      }
      .masonry-grid {
        column-count: 1;
      }
      #hero .row {
        flex-direction: column-reverse;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }
    @media (max-width: 576px) {
      .stat-number {
        font-size: 2.2rem;
      }
    }