/* ============================================
   AISpend Design System
   Dark, dense, evidence-first. Inspired by htop + Linear.
   ============================================ */

:root {
  --bg: #0d1117;
  --bg-elevated: #161b22;
  --bg-card: #1c2128;
  --bg-card-hover: #22272e;
  --border: #30363d;
  --border-strong: #444c56;
  --fg: #e6edf3;
  --fg-muted: #8d96a0;
  --fg-dim: #6e7681;
  --brand: #7c5cff;
  --brand-dim: #5b3fd9;
  --accent: #3fb950;
  --warn: #d29922;
  --danger: #f85149;
  --link: #79c0ff;
  --shadow: 0 1px 0 rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.3);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Monaco, Consolas, 'Courier New', monospace;
  --radius: 6px;
  --radius-lg: 10px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre, .mono { font-family: var(--font-mono); }

h1, h2, h3, h4 { line-height: 1.25; margin-top: 0; }
h1 { font-size: 2.4rem; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.6rem; font-weight: 600; letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; color: var(--fg-muted); }

/* ============================================
   Layout
   ============================================ */

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: 760px; margin: 0 auto; padding: 0 24px; }

.site-header {
  position: sticky;
  top: 0;
  background: rgba(13,17,23,0.85);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand-mark {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--brand), #3fb950);
  border-radius: 7px;
  display: inline-block;
}

nav.primary { display: flex; gap: 22px; }
nav.primary a {
  color: var(--fg-muted);
  font-size: 0.92rem;
  font-weight: 500;
}
nav.primary a:hover { color: var(--fg); text-decoration: none; }

.cta-mini {
  background: var(--brand);
  color: white;
  padding: 7px 14px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.88rem;
}
.cta-mini:hover { background: var(--brand-dim); text-decoration: none; }

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 80px;
  padding: 40px 0;
  color: var(--fg-muted);
  font-size: 0.88rem;
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.site-footer nav a { color: var(--fg-muted); }

/* ============================================
   Hero
   ============================================ */

.hero {
  padding: 80px 0 60px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(124,92,255,0.15) 0%, transparent 60%),
    var(--bg);
}
.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  margin-bottom: 16px;
  background: linear-gradient(180deg, #ffffff 30%, #8b949e);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .subtitle { color: var(--fg-muted); font-size: 1.15rem; max-width: 640px; margin: 0 auto 32px; }
.hero .cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.cta-primary, .cta-secondary {
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-block;
  transition: transform 0.1s;
}
.cta-primary {
  background: var(--brand);
  color: white;
  box-shadow: var(--shadow);
}
.cta-primary:hover { background: var(--brand-dim); text-decoration: none; transform: translateY(-1px); }
.cta-secondary {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  color: var(--fg);
}
.cta-secondary:hover { background: var(--bg-card-hover); text-decoration: none; }

/* ============================================
   Sections & cards
   ============================================ */

section { padding: 60px 0; }
section h2 { margin-bottom: 32px; text-align: center; }
section .lede { text-align: center; color: var(--fg-muted); max-width: 600px; margin: -16px auto 40px; }

.grid { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color 0.15s, background 0.15s;
}
.card:hover { border-color: var(--border-strong); background: var(--bg-card-hover); }
.card h3 { margin-bottom: 8px; }
.card .icon {
  width: 36px; height: 36px;
  background: rgba(124,92,255,0.15);
  color: var(--brand);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 12px;
}

/* ============================================
   Tables (the meat of the product)
   ============================================ */

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--bg-card); }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
thead { background: var(--bg-elevated); }
th, td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
th { font-weight: 600; color: var(--fg-muted); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--bg-card-hover); }
td.mono, td.num, th.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }
td .pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--bg-elevated);
  color: var(--fg-muted);
}
td .pill.free { background: rgba(63,185,80,0.15); color: var(--accent); }
td .pill.paid { background: rgba(124,92,255,0.15); color: var(--brand); }
td .pill.warn { background: rgba(210,153,34,0.15); color: var(--warn); }

/* ============================================
   Filters & controls
   ============================================ */

.controls {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  align-items: center;
}
.controls input[type="search"] {
  flex: 1;
  min-width: 220px;
  padding: 9px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: var(--radius);
  font-size: 0.92rem;
}
.controls input[type="search"]:focus {
  outline: 2px solid var(--brand);
  outline-offset: -1px;
  border-color: transparent;
}
.controls select {
  padding: 9px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: var(--radius);
  font-size: 0.92rem;
}
.controls label { color: var(--fg-muted); font-size: 0.85rem; }

/* ============================================
   Badges
   ============================================ */

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin: 32px 0; }
.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.stat .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--brand);
}
.stat .label { color: var(--fg-muted); font-size: 0.85rem; margin-top: 4px; }

/* ============================================
   Provider detail
   ============================================ */

.page-header { padding: 40px 0 24px; border-bottom: 1px solid var(--border); margin-bottom: 32px; }
.page-header .breadcrumb { color: var(--fg-dim); font-size: 0.85rem; margin-bottom: 8px; }
.page-header .breadcrumb a { color: var(--fg-muted); }

.prose { max-width: 720px; }
.prose p { margin: 0 0 16px; }
.prose h2 { margin: 32px 0 12px; text-align: left; }
.prose h3 { margin: 24px 0 8px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; }
.prose li { margin-bottom: 4px; }
.prose code { background: var(--bg-elevated); padding: 2px 6px; border-radius: 3px; font-size: 0.88em; }
.prose blockquote {
  border-left: 3px solid var(--brand);
  padding-left: 16px;
  color: var(--fg-muted);
  margin: 16px 0;
}
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }

/* ============================================
   Pricing tiers
   ============================================ */

.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin: 32px 0; }
.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
}
.pricing-card.featured { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(124,92,255,0.15); }
.pricing-card .tier { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--fg-muted); font-weight: 600; }
.pricing-card .price { font-size: 2.6rem; font-weight: 700; margin: 8px 0; font-family: var(--font-mono); }
.pricing-card .price .unit { font-size: 0.9rem; color: var(--fg-muted); font-weight: 400; }
.pricing-card .blurb { color: var(--fg-muted); font-size: 0.95rem; margin-bottom: 20px; }
.pricing-card ul { list-style: none; padding: 0; margin: 0 0 24px; flex-grow: 1; }
.pricing-card li { padding: 6px 0; color: var(--fg); font-size: 0.92rem; }
.pricing-card li::before { content: "✓ "; color: var(--accent); font-weight: 700; }
.pricing-card .cta-primary, .pricing-card .cta-secondary { text-align: center; }

/* ============================================
   Login / waitlist forms
   ============================================ */

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 480px;
  margin: 32px auto;
}
.form-card label { display: block; margin: 16px 0 6px; color: var(--fg-muted); font-size: 0.88rem; }
.form-card input, .form-card select, .form-card textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
}
.form-card input:focus, .form-card select:focus { outline: 2px solid var(--brand); outline-offset: -1px; }
.form-card .help { color: var(--fg-dim); font-size: 0.82rem; margin-top: 4px; }
.form-card button {
  margin-top: 20px;
  width: 100%;
  padding: 12px;
  background: var(--brand);
  color: white;
  border: 0;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}
.form-card button:hover { background: var(--brand-dim); }
.form-card .flash { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 16px; font-size: 0.9rem; }
.form-card .flash.ok { background: rgba(63,185,80,0.15); color: var(--accent); }
.form-card .flash.err { background: rgba(248,81,73,0.15); color: var(--danger); }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.4rem; }
  .container { padding: 0 16px; }
  .hero { padding: 48px 0 32px; }
  section { padding: 40px 0; }
  nav.primary { display: none; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .table-wrap { font-size: 0.82rem; }
  th, td { padding: 8px 10px; }
}

/* ============================================
   App shell (used by /app/* pages only)
   ============================================ */

.app-shell { display: grid; grid-template-columns: 220px 1fr; min-height: calc(100vh - 60px); }
.app-sidebar {
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  padding: 24px 0;
}
.app-sidebar nav { display: flex; flex-direction: column; }
.app-sidebar nav a {
  padding: 10px 20px;
  color: var(--fg-muted);
  font-size: 0.9rem;
  border-left: 3px solid transparent;
}
.app-sidebar nav a:hover, .app-sidebar nav a.active {
  background: var(--bg-card);
  color: var(--fg);
  text-decoration: none;
  border-left-color: var(--brand);
}
.app-main { padding: 32px 40px; max-width: 1200px; }

/* Buttons (used in app shell) */
.btn-danger {
  background: rgba(248,81,73,0.15);
  color: var(--danger);
  border: 1px solid rgba(248,81,73,0.3);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  cursor: pointer;
}
.btn-danger:hover { background: rgba(248,81,73,0.25); }
button.cta-primary {
  background: var(--brand);
  color: white;
  border: 0;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  font-size: 0.92rem;
}
button.cta-primary:hover { background: var(--brand-dim); }

input[type="number"], input[type="text"], select, textarea {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 9px 12px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.92rem;
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--brand);
  outline-offset: -1px;
  border-color: transparent;
}
textarea { font-family: var(--font-mono); font-size: 0.85rem; }

#usage-root, #stack-root, #benchmarks-root, #recs-root, #dash-root { min-height: 200px; }

@media (max-width: 768px) {
  .app-shell { grid-template-columns: 1fr; }
  .app-sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .app-sidebar nav { flex-direction: row; overflow-x: auto; }
  .app-main { padding: 20px; }
}