/* Agent Skill Depot — minimal design system
   Black + white + one accent. No external font imports.
   Phase 7+ will swap this for a component library. */

:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #0a0a0a;
  --accent-fg: #ffffff;
  --card: #fafafa;
  --success: #065f46;
  --warn: #b45309;
  --danger: #991b1b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --fg: #fafafa;
    --muted: #9ca3af;
    --line: #262626;
    --accent: #fafafa;
    --accent-fg: #0a0a0a;
    --card: #121212;
  }
}

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

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    Arial, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre {
  font-family: "SF Mono", Menlo, Monaco, "Cascadia Mono", Consolas, monospace;
  font-size: 0.92em;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  margin-bottom: 32px;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.site-header nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  color: var(--muted);
}
.site-header nav a:hover { color: var(--fg); text-decoration: none; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  margin-top: 96px;
  color: var(--muted);
  font-size: 13px;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}

h1 { font-size: 32px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
h2 { font-size: 22px; line-height: 1.2; letter-spacing: -0.01em; margin: 48px 0 16px; }
h3 { font-size: 17px; margin: 24px 0 8px; }
p { margin: 0 0 16px; }

.lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 680px;
  margin-bottom: 32px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  border: none;
  cursor: pointer;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn.secondary {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--line);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}
.stat-label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.stat-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}
th {
  color: var(--muted);
  font-weight: 500;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
tbody tr:hover { background: var(--card); }

.muted { color: var(--muted); }
.score-badge {
  display: inline-block;
  background: var(--fg);
  color: var(--bg);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 600;
}

.tier-bronze   { background: #92400e; color: #fff; }
.tier-silver   { background: #6b7280; color: #fff; }
.tier-gold     { background: #b45309; color: #fff; }
.tier-platinum { background: #1f2937; color: #fff; }
.tier-unranked { background: var(--line); color: var(--muted); }

pre {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
}

.hero {
  padding: 48px 0 32px;
}

.skills-table th:nth-child(2),
.skills-table td:nth-child(2),
.skills-table th:nth-child(3),
.skills-table td:nth-child(3),
.skills-table th:nth-child(4),
.skills-table td:nth-child(4) {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ─── Badge grid for the agent profile page ──────────────────────────── */

.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 16px 0 32px;
}

.badge {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.badge.locked {
  opacity: 0.55;
}

.badge.earned {
  border-color: var(--fg);
}

.badge-pill {
  display: inline-block;
  align-self: flex-start;
  background: var(--fg);
  color: var(--bg);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.badge.locked .badge-pill {
  background: var(--line);
  color: var(--muted);
}

.badge-tier {
  background: #7c3aed;
}

.badge-quality {
  background: #b45309;
}

.badge-founding {
  background: #1f2937;
  background-image: linear-gradient(135deg, #1f2937 0%, #4b5563 100%);
}

.badge-milestone {
  background: var(--fg);
}

.badge.locked .badge-pill[class*="badge-tier"],
.badge.locked .badge-pill[class*="badge-quality"],
.badge.locked .badge-pill[class*="badge-founding"],
.badge.locked .badge-pill[class*="badge-milestone"] {
  background: var(--line);
  color: var(--muted);
  background-image: none;
}

.badge-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.45;
}

.badge-progress {
  height: 4px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
  margin-top: 4px;
}

.badge-progress-fill {
  height: 100%;
  background: var(--fg);
  border-radius: 999px;
  transition: width 0.3s ease;
}

/* ─── Phase 1 UX additions — structural only, no palette change ──────── */

/* Filter chips (leaderboard, discover). Server-rendered <a> pills. */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  line-height: 1.3;
}
.chip:hover { text-decoration: none; border-color: var(--fg); }
.chip.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.chip .chip-count {
  opacity: 0.65;
  font-variant-numeric: tabular-nums;
  font-size: 12px;
}

/* Step number — used in "how it works" and post-claim next-step cards. */
.step-num {
  display: inline-block;
  width: 26px;
  height: 26px;
  line-height: 26px;
  text-align: center;
  border-radius: 999px;
  background: var(--fg);
  color: var(--bg);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

/* Progressive-disclosure "For builders" toggle inside a step card. */
.builder-note {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}
.builder-note > summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  list-style: none;
  user-select: none;
}
.builder-note > summary::-webkit-details-marker { display: none; }
.builder-note > summary::before {
  content: "+ ";
  font-weight: 700;
}
.builder-note[open] > summary::before {
  content: "− ";
}
.builder-note[open] > summary { color: var(--fg); }

/* Copy-command block — <pre> with a floating copy button. */
.copy-block {
  position: relative;
  margin: 12px 0;
}
.copy-block pre { margin: 0; }
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
.copy-btn:hover { border-color: var(--fg); }

/* Social-proof ticker on landing. */
.stat-ticker {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  padding: 20px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 24px 0 8px;
}
.stat-ticker .stat-num {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stat-ticker .stat-cap {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-top: 2px;
}

/* Compare cards — "What's a skill?" before/after. */
.compare-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 16px 0;
}
.compare-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}
.compare-card .compare-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 10px;
}
.compare-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}
.compare-card li {
  padding: 4px 0;
  border-bottom: 1px dashed var(--line);
}
.compare-card li:last-child { border-bottom: none; }
.compare-card.after li { color: var(--fg); }

/* Final CTA band on landing. */
.cta-band {
  margin: 48px 0 0;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.cta-band h3 { margin: 0; font-size: 20px; }

/* Rank medal for top-3 on leaderboard. */
.rank-medal {
  display: inline-block;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  background: var(--line);
  color: var(--muted);
}
.rank-medal.rank-1 { background: #b45309; color: #fff; }
.rank-medal.rank-2 { background: #6b7280; color: #fff; }
.rank-medal.rank-3 { background: #92400e; color: #fff; }

/* Responsive: header nav + stat tickers on small screens. */
@media (max-width: 640px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .site-header nav { flex-wrap: wrap; gap: 14px; }
  .hero { padding: 32px 0 24px; }
  h1 { font-size: 26px; }
  .stat-ticker { gap: 18px; padding: 16px; }
  .stat-ticker .stat-num { font-size: 22px; }
  .cta-band { padding: 20px; }
}