/* roulang page: index */
/* ===== Design Variables ===== */
:root {
  --color-bg-page: #070b17;
  --color-bg-card: #111827;
  --color-bg-elevated: #1a1f35;
  --color-border: rgba(255,255,255,0.08);
  --color-gold: #f5a623;
  --color-gold-dark: #d48c1c;
  --color-gold-glow: rgba(245,166,35,0.15);
  --color-text: #f1f3f7;
  --color-text-muted: #a0a8b8;
  --color-accent-blue: #3b82f6;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 30px rgba(245,166,35,0.08);
  --transition-base: 0.25s ease;
}

/* ===== Base Reset ===== */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  background: var(--color-bg-page);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition-base); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 2px; }
button { cursor: pointer; font-family: inherit; }

/* ===== Container ===== */
.container-custom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
@media (min-width: 768px) { .container-custom { padding: 0 2rem; } }
@media (min-width: 1024px) { .container-custom { padding: 0 2.5rem; } }

/* ===== Typography ===== */
.gradient-gold {
  background: linear-gradient(135deg, #f5a623, #f7c948, #f5a623);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gradient-text {
  background: linear-gradient(135deg, #f5a623 0%, #f7d06a 50%, #f5a623 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Stars Background ===== */
.stars-bg {
  position: relative;
  overflow: hidden;
}
.stars-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 30% 60%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 50% 10%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 70% 40%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 90% 80%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 15% 85%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 45% 45%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 80% 15%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.2px 1.2px at 25% 35%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 60% 75%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 5% 50%, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 95% 30%, rgba(255,255,255,0.4), transparent);
  background-size: 200% 200%;
  pointer-events: none;
  z-index: 0;
}

/* ===== Glass Card ===== */
.glass-card {
  background: rgba(17, 24, 39, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}
.glass-card:hover {
  border-color: rgba(245,166,35,0.2);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* ===== Feature Card ===== */
.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.feature-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}
.feature-card:hover::after { opacity: 1; }
.feature-card:hover {
  border-color: rgba(245,166,35,0.15);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.feature-card .icon-wrap {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  background: rgba(245,166,35,0.1);
  color: var(--color-gold);
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  transition: all var(--transition-base);
}
.feature-card:hover .icon-wrap {
  background: rgba(245,166,35,0.2);
  transform: scale(1.05);
}

/* ===== Category Card ===== */
.category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  min-height: 200px;
  display: flex; flex-direction: column;
  justify-content: flex-end;
  padding: 2rem 1.5rem;
}
.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(7,11,23,0.85) 100%);
  z-index: 1;
}
.category-card > * { position: relative; z-index: 2; }
.category-card:hover {
  border-color: rgba(245,166,35,0.25);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}
.category-card .cat-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  color: var(--color-gold);
}

/* ===== Article Card ===== */
.article-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-base);
}
.article-card:hover {
  border-color: rgba(245,166,35,0.15);
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
  transform: translateY(-2px);
}
.article-card .tag {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(245,166,35,0.12);
  color: var(--color-gold);
  letter-spacing: 0.3px;
}
.article-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 0.5rem 0 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-card .meta {
  display: flex; align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===== Stat Block ===== */
.stat-block {
  text-align: center;
  padding: 1.5rem 1rem;
}
.stat-block .number {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #f5a623, #f7d06a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-block .label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* ===== Step ===== */
.step-item {
  display: flex; gap: 1.25rem;
  align-items: flex-start;
}
.step-number {
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: rgba(245,166,35,0.12);
  color: var(--color-gold);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  border: 1px solid rgba(245,166,35,0.2);
}
.step-content h4 { font-weight: 600; font-size: 1.05rem; margin-bottom: 0.25rem; }
.step-content p { color: var(--color-text-muted); font-size: 0.9rem; }

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}
.faq-item:last-child { border-bottom: none; }
.faq-question {
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer;
  font-weight: 500;
  font-size: 1rem;
  user-select: none;
}
.faq-question .icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--color-gold);
}
.faq-item.active .faq-question .icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  max-height: 300px;
  padding-top: 0.75rem;
}

/* ===== Buttons ===== */
.btn-gold {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  background: linear-gradient(135deg, #f5a623, #e8951a);
  color: #070b17;
  border: none;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(245,166,35,0.25);
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(245,166,35,0.35);
}
.btn-gold:active { transform: translateY(0); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  background: transparent;
  color: var(--color-gold);
  border: 1px solid rgba(245,166,35,0.35);
  transition: all var(--transition-base);
}
.btn-outline:hover {
  background: rgba(245,166,35,0.08);
  border-color: var(--color-gold);
  transform: translateY(-2px);
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(7,11,23,0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: background 0.3s ease;
}
.nav-link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.5rem 0;
  transition: color var(--transition-base);
}
.nav-link::after {
  content: '';
  position: absolute; bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--color-gold);
  transition: width var(--transition-base);
  border-radius: 2px;
}
.nav-link:hover { color: var(--color-text); }
.nav-link:hover::after { width: 100%; }
.nav-link.active { color: var(--color-gold); }
.nav-link.active::after { width: 100%; }

/* ===== Footer ===== */
.site-footer {
  background: #050812;
  border-top: 1px solid rgba(255,255,255,0.04);
}
.site-footer a { color: var(--color-text-muted); transition: color var(--transition-base); }
.site-footer a:hover { color: var(--color-gold); }

/* ===== Mobile Menu ===== */
.mobile-menu {
  position: fixed; top: 0; right: 0; bottom: 0; left: 0;
  background: rgba(7,11,23,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 200;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 2rem;
  opacity: 0; visibility: hidden;
  transition: all 0.35s ease;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a {
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--color-text-muted);
}
.mobile-menu a.active { color: var(--color-gold); }
.mobile-close {
  position: absolute; top: 1.5rem; right: 1.5rem;
  font-size: 2rem; color: var(--color-text);
  background: none; border: none;
}

/* ===== Skeleton / Utilities ===== */
.section-title { font-size: 2rem; font-weight: 700; line-height: 1.3; }
.section-sub { font-size: 1rem; color: var(--color-text-muted); max-width: 600px; }
.glow-line {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
  border-radius: 3px;
  margin: 1rem 0 1.5rem;
}
.overflow-hidden { overflow: hidden; }

/* ===== Responsive ===== */
@media (max-width: 767px) {
  .section-title { font-size: 1.6rem; }
  .stat-block .number { font-size: 2rem; }
  .feature-card { padding: 1.5rem 1.25rem; }
  .category-card { min-height: 160px; padding: 1.5rem 1.25rem; }
  .article-card { padding: 1.25rem; }
  .btn-gold, .btn-outline { padding: 0.6rem 1.4rem; font-size: 0.9rem; }
}
@media (min-width: 768px) and (max-width: 1023px) {
  .stat-block .number { font-size: 2.2rem; }
}
@media (min-width: 1024px) {
  .section-title { font-size: 2.4rem; }
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.anim-fade-up { animation: fadeUp 0.6s ease both; }
.anim-fade-up-d1 { animation-delay: 0.1s; }
.anim-fade-up-d2 { animation-delay: 0.2s; }
.anim-fade-up-d3 { animation-delay: 0.3s; }

/* roulang page: article */
:root {
            --primary-light: #fbbf24;
            --primary-dark: #f59e0b;
            --bg-dark: #0b0e17;
            --bg-card: #13182b;
            --bg-card-hover: #1a2140;
            --text-main: #f1f5f9;
            --text-secondary: #a0a8b8;
            --text-muted: #6b7280;
            --border-subtle: rgba(255, 255, 255, 0.06);
            --radius-card: 16px;
            --radius-btn: 40px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
            --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background: var(--bg-dark);
            color: var(--text-main);
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-base);
        }

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

        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }

        .container-custom {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        @media (min-width: 768px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1280px) {
            .container-custom {
                padding-left: 2.5rem;
                padding-right: 2.5rem;
            }
        }

        .gradient-gold {
            background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .site-header {
            background: rgba(11, 14, 23, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            position: sticky;
            top: 0;
            z-index: 50;
            transition: background var(--transition-base);
        }

        .nav-link {
            font-size: 0.925rem;
            font-weight: 500;
            color: #b0b8c8;
            padding: 0.4rem 0.1rem;
            position: relative;
            transition: color var(--transition-base);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #fbbf24, #f59e0b);
            border-radius: 4px;
            transition: width var(--transition-base);
        }

        .nav-link:hover {
            color: #ffffff;
        }

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

        .nav-link.active {
            color: #fbbf24;
        }

        .nav-link.active::after {
            width: 100%;
            background: linear-gradient(90deg, #fbbf24, #f59e0b);
        }

        .btn-gold {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
            color: #0b0e17;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all var(--transition-base);
            box-shadow: 0 4px 14px rgba(251, 191, 36, 0.25);
        }

        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(251, 191, 36, 0.35);
            color: #0b0e17;
        }

        .btn-gold:focus-visible {
            outline: 2px solid #fbbf24;
            outline-offset: 3px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border: 1.5px solid rgba(251, 191, 36, 0.35);
            color: #fbbf24;
            font-weight: 500;
            border-radius: var(--radius-btn);
            background: transparent;
            cursor: pointer;
            transition: all var(--transition-base);
        }

        .btn-outline:hover {
            background: rgba(251, 191, 36, 0.08);
            border-color: #fbbf24;
            transform: translateY(-1px);
        }

        .btn-outline:focus-visible {
            outline: 2px solid #fbbf24;
            outline-offset: 3px;
        }

        .card-base {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-base);
        }

        .card-base:hover {
            background: var(--bg-card-hover);
            border-color: rgba(251, 191, 36, 0.12);
            box-shadow: var(--shadow-card);
            transform: translateY(-3px);
        }

        .badge-category {
            display: inline-block;
            padding: 0.25rem 0.9rem;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 500;
            letter-spacing: 0.02em;
            background: rgba(251, 191, 36, 0.1);
            color: #fbbf24;
            border: 1px solid rgba(251, 191, 36, 0.15);
        }

        .badge-date {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            font-size: 0.8rem;
            color: var(--text-secondary);
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 2.25rem;
            }
        }

        .text-glow {
            text-shadow: 0 0 40px rgba(251, 191, 36, 0.08);
        }

        .fade-in {
            animation: fadeInUp 0.6s ease forwards;
        }

        @keyframes fadeInUp {
            0% { opacity: 0; transform: translateY(24px); }
            100% { opacity: 1; transform: translateY(0); }
        }

        .prose-custom {
            max-width: 780px;
            margin-left: auto;
            margin-right: auto;
            color: #d1d5db;
            font-size: 1.05rem;
            line-height: 1.9;
        }

        .prose-custom h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: #ffffff;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
        }

        .prose-custom h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: #f1f5f9;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }

        .prose-custom p {
            margin-bottom: 1.25rem;
        }

        .prose-custom ul, .prose-custom ol {
            margin-bottom: 1.25rem;
            padding-left: 1.5rem;
        }

        .prose-custom li {
            margin-bottom: 0.5rem;
        }

        .prose-custom strong {
            color: #ffffff;
            font-weight: 600;
        }

        .prose-custom a {
            color: #fbbf24;
            border-bottom: 1px solid rgba(251, 191, 36, 0.25);
            transition: border-color var(--transition-base);
        }

        .prose-custom a:hover {
            border-bottom-color: #fbbf24;
        }

        .prose-custom blockquote {
            border-left: 3px solid #fbbf24;
            padding-left: 1.25rem;
            color: #a0a8b8;
            font-style: italic;
            margin: 1.5rem 0;
        }

        .prose-custom code {
            background: rgba(255, 255, 255, 0.06);
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            font-size: 0.9em;
            color: #fbbf24;
        }

        .prose-custom pre {
            background: rgba(0, 0, 0, 0.4);
            border-radius: 12px;
            padding: 1.25rem;
            overflow-x: auto;
            border: 1px solid rgba(255, 255, 255, 0.05);
            margin: 1.5rem 0;
        }

        .prose-custom img {
            border-radius: 12px;
            margin: 1.5rem 0;
            border: 1px solid rgba(255, 255, 255, 0.04);
        }

        .prose-custom hr {
            border: none;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            margin: 2rem 0;
        }

        .separator-star {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: var(--text-muted);
            font-size: 0.8rem;
        }

        .separator-star::before,
        .separator-star::after {
            content: '';
            flex: 1;
            height: 1px;
            background: rgba(255, 255, 255, 0.05);
        }

        .site-footer {
            background: rgba(8, 10, 18, 0.95);
            border-top: 1px solid rgba(255, 255, 255, 0.03);
        }

        .site-footer a {
            color: #a0a8b8;
            transition: color var(--transition-base);
        }

        .site-footer a:hover {
            color: #fbbf24;
        }

        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            z-index: 60;
            display: none;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .mobile-menu-overlay.open {
            display: block;
            opacity: 1;
        }

        .mobile-menu-panel {
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            width: 280px;
            max-width: 80vw;
            background: #0f1324;
            border-left: 1px solid rgba(255, 255, 255, 0.04);
            z-index: 70;
            padding: 2rem 1.5rem;
            transform: translateX(100%);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .mobile-menu-panel.open {
            transform: translateX(0);
        }

        .mobile-menu-panel a {
            font-size: 1.1rem;
            font-weight: 500;
            color: #b0b8c8;
            padding: 0.5rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.03);
        }

        .mobile-menu-panel a:hover {
            color: #fbbf24;
        }

        .mobile-menu-panel .btn-gold {
            margin-top: 1rem;
            text-align: center;
        }

        @media (max-width: 767px) {
            .section-title {
                font-size: 1.5rem;
            }
            .prose-custom {
                font-size: 0.98rem;
            }
            .prose-custom h2 {
                font-size: 1.35rem;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .badge-category {
                font-size: 0.7rem;
                padding: 0.2rem 0.7rem;
            }
        }

        .focus-ring:focus-visible {
            outline: 2px solid #fbbf24;
            outline-offset: 2px;
            border-radius: 4px;
        }

        ::selection {
            background: rgba(251, 191, 36, 0.25);
            color: #ffffff;
        }

/* roulang page: category1 */
:root {
            --primary: #f59e0b;
            --primary-dark: #d97706;
            --primary-light: #fbbf24;
            --bg-dark: #0b0f1a;
            --bg-card: #111827;
            --bg-card-hover: #1a2332;
            --text-white: #f1f5f9;
            --text-muted: #94a3b8;
            --text-dim: #64748b;
            --border-glow: rgba(245, 158, 11, 0.15);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45);
            --radius-card: 1rem;
            --radius-btn: 0.75rem;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg-dark);
            color: var(--text-white);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* gradient */
        .gradient-gold {
            background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 50%, #f59e0b 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .gradient-gold-bg {
            background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
        }

        /* header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(11, 15, 26, 0.92);
            backdrop-filter: blur(18px) saturate(1.3);
            border-bottom: 1px solid rgba(245, 158, 11, 0.08);
            transition: var(--transition);
        }

        .nav-link {
            position: relative;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 0.25rem 0;
            transition: var(--transition);
            text-decoration: none;
            letter-spacing: 0.01em;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #f59e0b, #fbbf24);
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav-link:hover {
            color: var(--text-white);
        }

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

        .nav-link.active {
            color: var(--primary-light);
        }

        .nav-link.active::after {
            width: 100%;
            background: linear-gradient(90deg, #f59e0b, #fbbf24);
        }

        .btn-gold {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
            color: #0b0f1a;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            box-shadow: 0 4px 16px rgba(245, 158, 11, 0.25);
        }

        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.35);
        }

        .btn-gold:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(245, 158, 11, 0.2);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border: 1.5px solid rgba(245, 158, 11, 0.3);
            color: var(--primary-light);
            font-weight: 500;
            border-radius: var(--radius-btn);
            background: transparent;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(245, 158, 11, 0.08);
            transform: translateY(-1px);
        }

        /* hero */
        .hero-guide {
            position: relative;
            padding: 5rem 0 4rem;
            background: radial-gradient(ellipse at 30% 20%, rgba(245, 158, 11, 0.05) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(59, 130, 246, 0.04) 0%, transparent 50%),
                var(--bg-dark);
            border-bottom: 1px solid rgba(245, 158, 11, 0.06);
        }

        .hero-guide::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f59e0b' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.5;
            pointer-events: none;
        }

        .hero-guide .star-particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: #fbbf24;
            border-radius: 50%;
            opacity: 0.3;
            animation: twinkle 3s ease-in-out infinite alternate;
        }

        @keyframes twinkle {
            0% {
                opacity: 0.15;
                transform: scale(0.8);
            }
            100% {
                opacity: 0.6;
                transform: scale(1.2);
            }
        }

        /* cards */
        .card-guide {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            border: 1px solid rgba(245, 158, 11, 0.06);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            overflow: hidden;
        }

        .card-guide:hover {
            transform: translateY(-6px);
            border-color: rgba(245, 158, 11, 0.15);
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
            background: var(--bg-card-hover);
        }

        .card-guide .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            transition: var(--transition);
        }

        .card-guide:hover .card-img {
            transform: scale(1.03);
        }

        .badge-guide {
            display: inline-block;
            padding: 0.2rem 0.75rem;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            border-radius: 999px;
            background: rgba(245, 158, 11, 0.12);
            color: var(--primary-light);
            border: 1px solid rgba(245, 158, 11, 0.15);
        }

        .badge-skill {
            display: inline-block;
            padding: 0.15rem 0.6rem;
            font-size: 0.65rem;
            font-weight: 500;
            border-radius: 999px;
            background: rgba(99, 102, 241, 0.12);
            color: #a5b4fc;
            border: 1px solid rgba(99, 102, 241, 0.15);
        }

        .badge-skill.easy {
            background: rgba(52, 211, 153, 0.12);
            color: #6ee7b7;
            border-color: rgba(52, 211, 153, 0.15);
        }

        .badge-skill.medium {
            background: rgba(251, 191, 36, 0.12);
            color: #fcd34d;
            border-color: rgba(251, 191, 36, 0.15);
        }

        .badge-skill.hard {
            background: rgba(248, 113, 113, 0.12);
            color: #fca5a5;
            border-color: rgba(248, 113, 113, 0.15);
        }

        /* step timeline */
        .step-timeline {
            position: relative;
            padding-left: 2.5rem;
        }

        .step-timeline::before {
            content: '';
            position: absolute;
            left: 0.75rem;
            top: 0.5rem;
            bottom: 0.5rem;
            width: 2px;
            background: linear-gradient(180deg, rgba(245, 158, 11, 0.3), rgba(245, 158, 11, 0.05));
            border-radius: 2px;
        }

        .step-item {
            position: relative;
            padding-bottom: 2.5rem;
        }

        .step-item:last-child {
            padding-bottom: 0;
        }

        .step-number {
            position: absolute;
            left: -2.5rem;
            top: 0.15rem;
            width: 2rem;
            height: 2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: #0b0f1a;
            font-weight: 700;
            font-size: 0.85rem;
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
        }

        /* FAQ */
        .faq-item {
            background: var(--bg-card);
            border-radius: 0.75rem;
            border: 1px solid rgba(245, 158, 11, 0.06);
            transition: var(--transition);
            overflow: hidden;
        }

        .faq-item:hover {
            border-color: rgba(245, 158, 11, 0.12);
        }

        .faq-question {
            padding: 1.25rem 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 500;
            color: var(--text-white);
            transition: var(--transition);
            user-select: none;
        }

        .faq-question:hover {
            color: var(--primary-light);
        }

        .faq-question .icon {
            font-size: 0.8rem;
            transition: var(--transition);
            color: var(--primary);
        }

        .faq-item.open .faq-question .icon {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            padding: 0 1.5rem;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 1.5rem 1.25rem;
        }

        /* footer */
        .site-footer {
            background: #080b14;
            border-top: 1px solid rgba(245, 158, 11, 0.05);
        }

        .site-footer a {
            color: var(--text-muted);
            text-decoration: none;
            transition: var(--transition);
        }

        .site-footer a:hover {
            color: var(--primary-light);
        }

        /* mobile nav */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background: rgba(11, 15, 26, 0.98);
            backdrop-filter: blur(24px);
            padding: 2rem 1.5rem;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 100;
            border-left: 1px solid rgba(245, 158, 11, 0.08);
            box-shadow: -8px 0 40px rgba(0, 0, 0, 0.6);
            overflow-y: auto;
        }

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

        .mobile-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 99;
            backdrop-filter: blur(2px);
        }

        .mobile-overlay.open {
            opacity: 1;
            visibility: visible;
        }

        /* section spacing */
        .section-pad {
            padding: 4.5rem 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        .section-sub {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 600px;
        }

        /* tags cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .tag-cloud a {
            display: inline-block;
            padding: 0.35rem 1rem;
            font-size: 0.8rem;
            font-weight: 500;
            border-radius: 999px;
            background: rgba(245, 158, 11, 0.06);
            color: var(--text-muted);
            border: 1px solid rgba(245, 158, 11, 0.08);
            text-decoration: none;
            transition: var(--transition);
        }

        .tag-cloud a:hover {
            background: rgba(245, 158, 11, 0.12);
            color: var(--primary-light);
            border-color: rgba(245, 158, 11, 0.2);
            transform: translateY(-1px);
        }

        /* responsive */
        @media (max-width: 1024px) {
            .section-title {
                font-size: 1.75rem;
            }
            .hero-guide {
                padding: 3.5rem 0 2.5rem;
            }
        }

        @media (max-width: 768px) {
            .container-custom {
                padding: 0 1.25rem;
            }
            .section-pad {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .hero-guide {
                padding: 2.5rem 0 2rem;
            }
            .hero-guide h1 {
                font-size: 2rem !important;
            }
            .step-timeline {
                padding-left: 2rem;
            }
            .step-number {
                left: -2rem;
                width: 1.6rem;
                height: 1.6rem;
                font-size: 0.7rem;
            }
            .faq-question {
                padding: 1rem 1.25rem;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 1.25rem;
                font-size: 0.85rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 1.25rem 1rem;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding: 0 1rem;
            }
            .section-pad {
                padding: 2.5rem 0;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .hero-guide h1 {
                font-size: 1.6rem !important;
            }
            .hero-guide .hero-desc {
                font-size: 0.9rem !important;
            }
            .card-guide .card-img {
                height: 160px;
            }
            .tag-cloud a {
                font-size: 0.7rem;
                padding: 0.25rem 0.75rem;
            }
        }

        /* focus */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid #f59e0b;
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* scrollbar */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(245, 158, 11, 0.2);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(245, 158, 11, 0.35);
        }

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --secondary: #16213e;
            --accent: #e2b714;
            --accent-light: #f0d060;
            --deep-space: #0f0f1a;
            --card-bg: #1e1e32;
            --text-main: #e8ecf1;
            --text-muted: #a0a8b8;
            --border-subtle: rgba(255, 255, 255, 0.06);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.5);
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background: var(--deep-space);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
            transition: var(--transition);
        }

        /* ===== Container ===== */
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        @media (max-width: 640px) {
            .container-custom {
                padding: 0 1rem;
            }
        }

        /* ===== Gradient Gold ===== */
        .gradient-gold {
            background: linear-gradient(135deg, #e2b714 0%, #f0d060 50%, #d4a80a 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* ===== Site Header ===== */
        .site-header {
            background: rgba(15, 15, 26, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            height: 4rem;
        }

        @media (min-width: 768px) {
            .site-header {
                height: 4.5rem;
            }
        }

        .site-header .container-custom {
            height: 100%;
        }

        /* ===== Navigation ===== */
        .nav-link {
            position: relative;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 0.25rem 0;
            transition: var(--transition);
        }

        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            transition: var(--transition);
        }

        .nav-link:hover {
            color: #fff;
        }

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

        .nav-link.active {
            color: #fff;
        }

        .nav-link.active::after {
            width: 100%;
            background: var(--accent);
        }

        .btn-gold {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #e2b714, #d4a80a);
            color: #0f0f1a;
            font-weight: 600;
            border-radius: 9999px;
            padding: 0.5rem 1.5rem;
            font-size: 0.85rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            gap: 0.4rem;
        }

        .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(226, 183, 20, 0.3);
            background: linear-gradient(135deg, #f0d060, #e2b714);
        }

        .btn-gold:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border: 1.5px solid var(--accent);
            color: var(--accent);
            font-weight: 600;
            border-radius: 9999px;
            padding: 0.5rem 1.5rem;
            font-size: 0.85rem;
            background: transparent;
            transition: var(--transition);
            cursor: pointer;
            gap: 0.4rem;
        }

        .btn-outline:hover {
            background: rgba(226, 183, 20, 0.12);
            transform: translateY(-2px);
        }

        .btn-outline:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== Mobile Menu ===== */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background: rgba(15, 15, 26, 0.98);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-left: 1px solid var(--border-subtle);
            z-index: 200;
            padding: 2rem 1.5rem;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

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

        .mobile-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 199;
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
        }

        .mobile-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-nav-link {
            font-size: 1.1rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 0.6rem 0;
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition);
        }

        .mobile-nav-link:hover,
        .mobile-nav-link.active {
            color: #fff;
        }

        /* ===== Hero ===== */
        .hero-tips {
            position: relative;
            padding: 4rem 0 3.5rem;
            background: linear-gradient(180deg, #0f0f1a 0%, #1a1a2e 100%);
            overflow: hidden;
        }

        .hero-tips::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(226, 183, 20, 0.06) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 60%, rgba(255, 255, 255, 0.02) 0%, transparent 60%);
            pointer-events: none;
        }

        .hero-tips .container-custom {
            position: relative;
            z-index: 1;
        }

        /* ===== Section ===== */
        .section-padding {
            padding: 4rem 0;
        }

        @media (min-width: 768px) {
            .section-padding {
                padding: 5rem 0;
            }
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 640px;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 2.25rem;
            }
        }

        /* ===== Card ===== */
        .card-glass {
            background: var(--card-bg);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
            overflow: hidden;
        }

        .card-glass:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(226, 183, 20, 0.15);
        }

        /* ===== Tag / Badge ===== */
        .badge-accent {
            display: inline-block;
            background: rgba(226, 183, 20, 0.12);
            color: var(--accent);
            font-size: 0.7rem;
            font-weight: 600;
            padding: 0.2rem 0.7rem;
            border-radius: 9999px;
            letter-spacing: 0.02em;
            border: 1px solid rgba(226, 183, 20, 0.15);
        }

        /* ===== Step Number ===== */
        .step-number {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 50%;
            background: linear-gradient(135deg, #e2b714, #d4a80a);
            color: #0f0f1a;
            font-weight: 700;
            font-size: 1rem;
            flex-shrink: 0;
        }

        /* ===== FAQ ===== */
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            padding: 1.2rem 0;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: #fff;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            padding: 0.2rem 0;
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-question .icon {
            font-size: 1.2rem;
            transition: var(--transition);
            flex-shrink: 0;
            color: var(--accent);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        .faq-answer.open {
            max-height: 360px;
            padding-top: 0.8rem;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(226, 183, 20, 0.05) 0%, transparent 70%);
            pointer-events: none;
        }

        .cta-section .container-custom {
            position: relative;
            z-index: 1;
        }

        @media (min-width: 768px) {
            .cta-section {
                padding: 4rem 3rem;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0a0a14;
            border-top: 1px solid var(--border-subtle);
        }

        .site-footer a {
            color: var(--text-muted);
            transition: var(--transition);
        }

        .site-footer a:hover {
            color: var(--accent);
        }

        /* ===== Responsive Grid ===== */
        .grid-tips {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }

        @media (min-width: 640px) {
            .grid-tips {
                grid-template-columns: repeat(2, 1fr);
            }
        }

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

        .grid-steps {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 768px) {
            .grid-steps {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        /* ===== Focus Visible ===== */
        *:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }

        ::-webkit-scrollbar-track {
            background: var(--deep-space);
        }

        ::-webkit-scrollbar-thumb {
            background: #333;
            border-radius: 3px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: #555;
        }

        /* ===== List Style ===== */
        .list-check {
            list-style: none;
            padding: 0;
        }

        .list-check li {
            display: flex;
            align-items: flex-start;
            gap: 0.6rem;
            padding: 0.4rem 0;
            color: var(--text-muted);
            font-size: 0.92rem;
        }

        .list-check li::before {
            content: '✦';
            color: var(--accent);
            font-size: 0.7rem;
            margin-top: 0.25rem;
            flex-shrink: 0;
        }

        /* ===== Table ===== */
        .table-params {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.88rem;
        }

        .table-params th,
        .table-params td {
            padding: 0.75rem 1rem;
            text-align: left;
            border-bottom: 1px solid var(--border-subtle);
        }

        .table-params th {
            color: var(--accent);
            font-weight: 600;
            background: rgba(226, 183, 20, 0.04);
        }

        .table-params td {
            color: var(--text-muted);
        }

        .table-params tr:hover td {
            background: rgba(255, 255, 255, 0.02);
        }

        @media (max-width: 640px) {
            .table-params th,
            .table-params td {
                padding: 0.5rem 0.6rem;
                font-size: 0.8rem;
            }
        }