/* roulang page: index */
@layer base {
        :root {
            --bg-dark: #0C0E0A;
            --bg-light: #F4F1E8;
            --surface: #FFFFFF;
            --accent: #C6F24E;
            --muted: #6A6F63;
            --line: rgba(12,14,10,0.12);
            --line-dark: rgba(255,255,255,0.16);
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 1px 2px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.08);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--bg-light);
            color: #1C1E1A;
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        h1,h2,h3,h4,.font-display {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; }
        button { cursor: pointer; }
        input,textarea,select { font-family: inherit; }
        *:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }
        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }
    }
    @layer components {
        .container-x {
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        .btn-primary-dark {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--accent);
            color: #0C0E0A !important;
            font-weight: 700;
            font-size: 0.95rem;
            padding: 0.75rem 1.75rem;
            border-radius: var(--radius-pill);
            transition: all .2s ease;
            border: 1px solid transparent;
        }
        .btn-primary-dark:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.12);
            background: #d4fc63;
        }
        .btn-secondary-light {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            border: 1px solid var(--line-dark);
            color: rgba(255,255,255,0.9) !important;
            font-weight: 500;
            padding: 0.75rem 1.4rem;
            border-radius: var(--radius-pill);
            transition: all .2s ease;
            background: transparent;
            font-size: 0.95rem;
        }
        .btn-secondary-light:hover {
            background: rgba(255,255,255,0.08);
            border-color: rgba(255,255,255,0.4);
        }
        .btn-outline-dark {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            border: 1px solid var(--line);
            color: #0C0E0A;
            font-weight: 600;
            padding: 0.7rem 1.5rem;
            border-radius: var(--radius-pill);
            transition: all .2s ease;
            background: transparent;
        }
        .btn-outline-dark:hover {
            border-color: #0C0E0A;
            background: rgba(12,14,10,0.05);
        }
        .badge-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.05em;
            padding: 0.25rem 0.75rem;
            background: rgba(198,242,78,0.14);
            color: #0C0E0A;
            border-radius: var(--radius-pill);
        }
        .badge-dark-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.25rem 0.75rem;
            background: rgba(198,242,78,0.12);
            color: var(--accent);
            border-radius: var(--radius-pill);
        }
        .card-surface {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-md);
            transition: transform .2s ease, box-shadow .2s ease;
        }
        .card-surface:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-card);
        }
        .card-dark {
            background: #15170F;
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255,255,255,0.1);
        }
        .nav-link-item {
            font-size: 0.9rem;
            font-weight: 500;
            padding: 0.4rem 0.4rem;
            color: rgba(255,255,255,0.75);
            transition: all .2s ease;
            display: inline-flex;
            align-items: center;
            border-bottom: 2px solid transparent;
        }
        .nav-link-item:hover {
            color: var(--accent);
        }
        .nav-link-item.active {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }
        .dark-card-container {
            background: linear-gradient(135deg, #14160F 0%, #1A1D14 100%);
        }
        .section-padding {
            padding-top: 96px;
            padding-bottom: 96px;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease, padding .3s ease;
        }
        .faq-item.expanded .faq-answer {
            max-height: 500px;
        }
        .stat-tile {
            border-radius: 12px;
            border: 1px solid rgba(255,255,255,0.08);
            background: rgba(255,255,255,0.035);
            padding: 1.2rem 1rem;
        }
        @media (max-width: 640px) {
            .section-padding {
                padding-top: 56px;
                padding-bottom: 56px;
            }
        }
    }

.hero-gradient-overlay {
        background: linear-gradient(to right, rgba(12,14,10,0.97) 0%, rgba(12,14,10,0.82) 45%, rgba(12,14,10,0.5) 100%);
    }
    .lightbeam-grid-overlay {
        background-image: linear-gradient(rgba(198,242,78,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(198,242,78,0.05) 1px, transparent 1px);
        background-size: 42px 42px;
    }
    .font-inter-display {
        letter-spacing: -0.02em;
    }
    .text-balance {
        text-wrap: balance;
    }
    a.article-arrow-link {
        transition: gap .2s ease, color .2s ease;
    }
    a.article-arrow-link:hover i {
        transform: translateX(4px);
    }
    a.article-arrow-link i {
        transition: transform .2s ease;
    }
    .bg-vs-middle {
        background: linear-gradient(180deg, #0C0E0A 60%, #1c2014 100%);
    }
    .hero-linechart-svg line, .hero-linechart-svg path {
        vector-effect: non-scaling-stroke;
    }
    .backtop:hover {
        background: var(--accent);
        color: #0C0E0A;
    }

/* roulang page: category1 */
:root {
  --bg-dark: #0C0E0A;
  --bg-light: #F4F1E8;
  --surface: #FFFFFF;
  --accent: #C6F24E;
  --muted: #6A6F63;
  --line: rgba(12,14,10,0.12);
  --line-dark: rgba(255,255,255,0.16);
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 1px 2px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.08);
}
html { scroll-behavior: smooth; }
body {
  background-color: var(--bg-light);
  color: #1C1E1A;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
input, textarea, select { font-family: inherit; }
.container-x {
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}
.section-padding { padding-top: 96px; padding-bottom: 96px; }
@media (max-width: 640px) {
  .section-padding { padding-top: 56px; padding-bottom: 56px; }
}

/* 按钮 */
.btn-primary-dark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #0C0E0A !important;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-pill);
  transition: all .2s ease;
  border: 1px solid transparent;
}
.btn-primary-dark:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  background: #d4fc63;
}
.btn-secondary-light {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--line-dark);
  color: rgba(255,255,255,0.9) !important;
  font-weight: 500;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-pill);
  transition: all .2s ease;
  background: transparent;
  font-size: 0.95rem;
}
.btn-secondary-light:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.4);
}
.btn-outline-dark {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--line);
  color: #0C0E0A;
  font-weight: 600;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-pill);
  transition: all .2s ease;
  background: transparent;
}
.btn-outline-dark:hover {
  border-color: #0C0E0A;
  background: rgba(12,14,10,0.05);
}

.badge-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.28rem 0.8rem;
  background: rgba(198,242,78,0.14);
  color: #0C0E0A;
  border-radius: var(--radius-pill);
}
.badge-dark-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.28rem 0.8rem;
  background: rgba(198,242,78,0.12);
  color: var(--accent);
  border-radius: var(--radius-pill);
}

.card-surface {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: transform .2s ease, box-shadow .2s ease;
}
.card-surface:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
.card-dark {
  background: #15170F;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
}
.nav-link-item {
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.4rem;
  color: rgba(255,255,255,0.75);
  transition: all .2s ease;
  display: inline-flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.nav-link-item:hover {
  color: var(--accent);
}
.nav-link-item.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.no-scrollbar::-webkit-scrollbar { display: none; }
.no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease, padding .3s ease;
}
.faq-item.open .faq-answer {
  max-height: 700px;
}
.faq-item.open .faq-toggle-btn i {
  transform: rotate(45deg);
}
.faq-toggle-btn i {
  transition: transform .25s ease;
}

/* 双层导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: rgba(12,14,10,0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.site-header .brand-row {
  height: 72px;
  overflow: hidden;
  opacity: 1;
  transform: translateY(0);
  transition: height .32s ease, opacity .22s ease, transform .32s ease;
}
.site-header .channel-row {
  height: 48px;
  border-top: 1px solid rgba(255,255,255,0.05);
  transition: height .32s ease;
  overflow: hidden;
}
.site-header.scrolled .brand-row {
  height: 0;
  opacity: 0;
  transform: translateY(-10px);
}
.site-header.scrolled .channel-row {
  height: 58px;
}
@media (max-width: 767px) {
  .site-header .brand-row {
    display: none;
  }
  .site-header .channel-row {
    height: 58px;
  }
  .site-header .channel-row .channel-inner {
    height: 58px !important;
  }
}
.channel-inner {
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-drawer {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .35s ease, opacity .25s ease;
  background: rgba(12,14,10,0.98);
}
.mobile-drawer.open {
  max-height: 640px;
  opacity: 1;
}
.mobile-drawer a {
  color: rgba(255,255,255,0.82);
  font-weight: 500;
}
.mobile-drawer a:hover {
  color: var(--accent);
}

/* 数据/图表装饰 */
.lightbeam-grid-overlay {
  background-image: linear-gradient(rgba(198,242,78,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(198,242,78,0.05) 1px, transparent 1px);
  background-size: 42px 42px;
}
.hero-gradient-overlay {
  background: linear-gradient(to right, rgba(12,14,10,0.97) 0%, rgba(12,14,10,0.82) 45%, rgba(12,14,10,0.5) 100%);
}
.image-card-gradient {
  background: linear-gradient(180deg, rgba(12,14,10,0.02) 0%, rgba(12,14,10,0.87) 100%);
}
a.article-arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: inherit;
  transition: color .2s ease;
}
a.article-arrow-link i {
  transition: transform .2s ease;
}
a.article-arrow-link:hover i {
  transform: translateX(4px);
}
a.article-arrow-link:hover {
  color: #577A00;
}
.cover-zoom {
  overflow: hidden;
}
.cover-zoom img {
  transition: transform .35s ease;
}
.cover-zoom:hover img {
  transform: scale(1.035);
}
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 45;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  background: #0C0E0A;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all .25s ease;
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}
.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}