:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #21262d;
  --color-primary: #58a6ff;
  --color-primary-hover: #79b8ff;
  --color-success: #3fb950;
  --color-danger: #f85149;
  --color-warning: #d29922;
  --color-gold: #ffd700;
  --color-silver: #c0c0c0;
  --color-bronze: #cd7f32;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-border: #30363d;
  --color-xp: #a371f7;
  --font-main: 'Inter', system-ui, -apple-system, Segoe UI, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --radius: 8px;
  --radius-sm: 6px;
  --radius-lg: 12px;
  --shadow: 0 4px 12px rgba(0,0,0,0.4);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
img { max-width: 100%; height: auto; display: block; }

a { color: var(--color-primary); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--color-primary-hover); }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.25; margin: 0 0 var(--space-4); color: var(--color-text); }
h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
p { margin: 0 0 var(--space-4); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-4); }
.container-narrow { max-width: 820px; margin: 0 auto; padding: 0 var(--space-4); }

.skip-link {
  position: absolute; top: -40px; left: 0;
  background: var(--color-primary); color: #fff;
  padding: var(--space-2) var(--space-4); z-index: 100;
}
.skip-link:focus { top: 0; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-4); gap: var(--space-4);
}
.brand { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: 800; font-size: 1.15rem; color: var(--color-text); }
.brand-icon { color: var(--color-primary); font-size: 1.4rem; }
.site-nav { display: flex; align-items: center; gap: var(--space-4); }
.site-nav a { color: var(--color-text); font-weight: 500; padding: 8px 4px; }
.site-nav a:hover { color: var(--color-primary); }
.nav-cta {
  background: var(--color-primary); color: #fff !important;
  padding: 8px 16px !important; border-radius: var(--radius-sm); font-weight: 600;
}
.nav-cta:hover { background: var(--color-primary-hover); color: #fff !important; }
.nav-admin { color: var(--color-warning) !important; }
.nav-link-muted { color: var(--color-text-muted) !important; font-size: 0.9rem; }

.nav-toggle {
  display: none; background: transparent; border: 1px solid var(--color-border);
  color: var(--color-text); padding: 8px 12px; border-radius: var(--radius-sm);
  cursor: pointer; min-height: 44px; min-width: 44px;
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--color-surface); border-bottom: 1px solid var(--color-border);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: var(--space-2);
    display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 16px; min-height: 44px; display: flex; align-items: center; }
  .nav-cta { margin: var(--space-2) 0; text-align: center; justify-content: center; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2); padding: 12px 22px;
  border-radius: var(--radius-sm); font-weight: 600;
  font-family: inherit; font-size: 1rem;
  border: 1px solid transparent; cursor: pointer; min-height: 44px;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; }
.btn-secondary { background: var(--color-surface-2); color: var(--color-text); border-color: var(--color-border); }
.btn-secondary:hover { background: var(--color-border); color: var(--color-text); }
.btn-ghost { background: transparent; color: var(--color-text); border-color: var(--color-border); }
.btn-ghost:hover { background: var(--color-surface); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-success { background: var(--color-success); color: #fff; }
.btn-block { width: 100%; }
.btn-lg { padding: 16px 32px; font-size: 1.1rem; }
.btn-sm { padding: 8px 14px; font-size: 0.9rem; min-height: 36px; }

/* Forms */
.form-group { margin-bottom: var(--space-4); }
.form-group label { display: block; font-weight: 500; margin-bottom: var(--space-2); color: var(--color-text); }
.form-control, input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="url"], input[type="datetime-local"], select, textarea {
  width: 100%; padding: 12px 14px;
  background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: inherit; font-size: 16px; min-height: 44px;
  transition: border-color 0.15s;
}
textarea { min-height: 120px; resize: vertical; line-height: 1.5; }
.form-control:focus, input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(88,166,255,0.2);
}
.form-help { color: var(--color-text-muted); font-size: 0.85rem; margin-top: 4px; }
.form-error { color: var(--color-danger); font-size: 0.9rem; margin-top: 4px; }

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow);
}
.card-hover { transition: border-color 0.15s, transform 0.15s; }
.card-hover:hover { border-color: var(--color-primary); transform: translateY(-2px); }

/* Sections */
.section { padding: var(--space-12) 0; }
.section-sm { padding: var(--space-8) 0; }
.section-title { text-align: center; margin-bottom: var(--space-8); }
.section-title p { color: var(--color-text-muted); max-width: 600px; margin: 0 auto; }

/* Hero */
.hero {
  padding: var(--space-12) 0 var(--space-8);
  text-align: center;
  background: radial-gradient(ellipse at top, rgba(88,166,255,0.08), transparent 60%);
}
.hero h1 { margin-bottom: var(--space-4); }
.hero-subtitle { color: var(--color-text-muted); font-size: clamp(1.05rem, 2vw, 1.25rem); max-width: 700px; margin: 0 auto var(--space-6); }
.hero-stats { display: flex; flex-wrap: wrap; gap: var(--space-6); justify-content: center; align-items: center; margin-top: var(--space-8); }
.hero-stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.hero-stat-value { font-size: 1.8rem; font-weight: 700; color: var(--color-primary); }
.hero-stat-label { font-size: 0.85rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

/* AEO answer box */
.answer-summary {
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-sm);
  margin: var(--space-6) auto;
  max-width: 760px;
}
.answer-summary p { margin: 0; }

/* Flash */
.flash {
  padding: var(--space-3) var(--space-4); margin: 0 auto var(--space-4);
  max-width: 1200px; border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}
.flash-success { border-color: var(--color-success); background: rgba(63,185,80,0.1); }
.flash-error   { border-color: var(--color-danger);  background: rgba(248,81,73,0.1); }
.flash-info    { border-color: var(--color-primary); background: rgba(88,166,255,0.1); }

/* Cookie banner */
.cookie-banner {
  position: fixed; bottom: var(--space-4); left: var(--space-4); right: var(--space-4);
  max-width: 720px; margin: 0 auto;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: var(--space-4);
  display: flex; align-items: center; gap: var(--space-4);
  box-shadow: var(--shadow); z-index: 60; flex-wrap: wrap;
}
.cookie-banner p { margin: 0; flex: 1; min-width: 240px; font-size: 0.9rem; }
.cookie-banner[hidden] { display: none; }

/* Footer */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0 var(--space-6);
  margin-top: var(--space-16);
}
.footer-top {
  display: grid; grid-template-columns: 1fr 2fr; gap: var(--space-8);
  margin-bottom: var(--space-8); align-items: flex-start;
}
.footer-tag { color: var(--color-text-muted); margin-top: var(--space-2); }
.footer-cols {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6);
  align-items: flex-start;
}
.footer-cols h4 { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--color-text); margin-bottom: var(--space-3); }
.footer-cols ul { list-style: none; padding: 0; margin: 0; }
.footer-cols li { margin-bottom: var(--space-2); }
.footer-cols a { color: var(--color-text-muted); font-size: 0.9rem; }
.footer-cols a:hover { color: var(--color-primary); }

.footer-tools { padding-top: var(--space-6); border-top: 1px solid var(--color-border); }
.footer-tools h4 { font-size: 0.95rem; margin-bottom: var(--space-4); }
.footer-tools-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6);
  align-items: flex-start;
}
.footer-tools-grid h5 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--color-text-muted); margin-bottom: var(--space-2); }
.footer-tools-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-tools-grid li { margin-bottom: 6px; }
.footer-tools-grid a { font-size: 0.85rem; color: var(--color-text); }
.footer-tools-grid a:hover { color: var(--color-primary); }

.footer-bottom {
  margin-top: var(--space-8); padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: var(--space-2);
}
.footer-bottom .muted { color: var(--color-text-muted); font-size: 0.85rem; margin: 0; }
.footer-bottom p { margin: 0; }

@media (max-width: 1024px) {
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
  .footer-tools-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
  .footer-tools-grid { grid-template-columns: 1fr; }
}

/* Tables */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--color-border); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px var(--space-4); text-align: left; border-bottom: 1px solid var(--color-border); }
th { font-weight: 600; color: var(--color-text-muted); text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.5px; background: var(--color-surface); }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.02); }

/* Badges */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600;
  background: var(--color-surface-2); color: var(--color-text);
}
.badge-pro { background: var(--color-xp); color: #fff; }
.badge-admin { background: var(--color-warning); color: #000; }
.badge-success { background: rgba(63,185,80,0.2); color: var(--color-success); }

/* Grid */
.grid { display: grid; gap: var(--space-6); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); align-items: start; }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); align-items: start; }

/* Stats card */
.stat-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  padding: var(--space-4); border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 4px;
  min-height: 100px; justify-content: center;
}
.stat-card-value { font-size: 1.75rem; font-weight: 700; color: var(--color-primary); }
.stat-card-label { color: var(--color-text-muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px; }

/* Empty state */
.empty-state {
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: var(--space-2);
  min-height: 180px; color: var(--color-text-muted);
  text-align: center; padding: var(--space-4);
}
.empty-state i { font-size: 2rem; color: var(--color-text-muted); }
.empty-state p { font-size: 0.9rem; margin: 0; }

/* Ad slots */
.ad-slot { background: var(--color-surface); border: 1px dashed var(--color-border); display: flex; align-items: center; justify-content: center; color: var(--color-text-muted); margin: var(--space-6) auto; }
.ad-slot-leaderboard { width: 100%; max-width: 728px; height: 90px; }
.ad-slot-rectangle { width: 300px; height: 250px; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); max-width: 820px; margin: 0 auto; }
.faq-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-4) var(--space-6); }
.faq-item summary { font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.4rem; color: var(--color-primary); transition: transform 0.2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { margin: var(--space-3) 0 0; color: var(--color-text-muted); }

/* PAA */
.paa-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px,1fr)); gap: var(--space-4); align-items: start; }
.paa-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-4); }
.paa-card h3 { font-size: 1rem; margin-bottom: var(--space-2); color: var(--color-primary); }
.paa-card p { font-size: 0.9rem; color: var(--color-text-muted); margin: 0; }

/* Comparison table */
.comparison-table { background: var(--color-surface); border-radius: var(--radius); overflow: hidden; }
.comparison-table th { background: var(--color-surface-2); }

@media (prefers-reduced-motion: no-preference) {
  .card-hover, .btn { transition: all 0.15s ease; }
}

/* Responsive headers */
@media (max-width: 900px) {
  .hero-stats { gap: var(--space-4); }
  .hero-stat-value { font-size: 1.4rem; }
}