/* IDK License — idklaw.net */
:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #666;
  --border: #ddd;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --warn: #d97706;
  --danger: #dc2626;
  --success: #059669;
  --code-bg: #f3f4f6;
  --card-bg: #fff;
  --max-w: 52rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111;
    --fg: #e5e5e5;
    --muted: #999;
    --border: #333;
    --code-bg: #1e1e1e;
    --card-bg: #1a1a1a;
  }
}

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

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 40rem; }

/* Nav */
nav {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
nav .logo {
  font-weight: 700;
  font-size: 1.2rem;
  text-decoration: none;
  color: var(--fg);
}
nav .logo span { color: var(--muted); font-weight: 400; }
nav ul { list-style: none; display: flex; gap: 1.5rem; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
nav a:hover { color: var(--fg); }

/* Nav dropdown */
nav .dropdown { position: relative; }
nav .dropdown > a { cursor: pointer; }
nav .dropdown > a::after { content: " \25BE"; font-size: 0.75em; }
nav .dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0;
  min-width: 14rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 20;
}
nav .dropdown:hover .dropdown-menu,
nav .dropdown:focus-within .dropdown-menu,
nav .dropdown.open .dropdown-menu { display: block; }
nav .dropdown-menu a {
  display: block;
  padding: 0.35rem 1rem;
  white-space: nowrap;
}
nav .dropdown-menu a:hover { background: var(--code-bg); }
nav .dropdown-menu .dropdown-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 0.5rem 1rem 0.2rem;
  pointer-events: none;
}
nav .dropdown-menu .dropdown-label:first-child { padding-top: 0.25rem; }
nav .dropdown-menu hr {
  margin: 0.35rem 0;
  border-top: 1px solid var(--border);
}

/* Typography */
h1 { font-size: 2.2rem; line-height: 1.2; margin-bottom: 1rem; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; margin: 2.5rem 0 1rem; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; margin: 2rem 0 0.75rem; }
p { margin-bottom: 1rem; }
a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
strong { font-weight: 600; }
hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* Hero */
.hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: 2.8rem; max-width: 38rem; }
.hero .subtitle {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 36rem;
  margin-bottom: 2rem;
}
.hero .badges {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.badge {
  display: inline-block;
  font-size: 0.8rem;
  font-family: var(--mono);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: var(--code-bg);
  color: var(--muted);
  border: 1px solid var(--border);
}
.badge.warn { border-color: var(--warn); color: var(--warn); }
.badge.danger { border-color: var(--danger); color: var(--danger); }
.badge.ok { border-color: var(--success); color: var(--success); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-secondary {
  background: var(--card-bg);
  color: var(--fg);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-group { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* Cards / Grid */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}
.card h3 { margin-top: 0; }
.card ul { padding-left: 1.25rem; }
.card li { margin-bottom: 0.35rem; }

/* Sections */
section { padding: 3rem 0; }
section + section { border-top: 1px solid var(--border); }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); }
th { font-weight: 600; white-space: nowrap; }
.check { color: var(--success); }
.cross { color: var(--muted); }

/* Code */
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 3px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 1rem 0;
}
pre code { background: none; padding: 0; }

/* License text */
.license-text {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-x: auto;
  margin: 1.5rem 0;
}

/* FAQ */
details {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}
details summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
details summary::after { content: "+"; color: var(--muted); font-size: 1.2rem; }
details[open] summary::after { content: "\2212"; }
details p, details ul { margin-top: 0.75rem; color: var(--muted); }
details code { color: var(--fg); }

/* Callouts */
.callout {
  padding: 1rem 1.25rem;
  border-radius: 6px;
  border-left: 4px solid;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.callout.warn { border-color: var(--warn); background: rgba(217,119,6,0.07); }
.callout.info { border-color: var(--accent); background: rgba(37,99,235,0.05); }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 3rem;
}
footer a { color: var(--muted); }
footer a:hover { color: var(--fg); }

/* Utility */
.text-muted { color: var(--muted); }
.text-sm { font-size: 0.9rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.steps { counter-reset: step; list-style: none; padding: 0; }
.steps li { counter-increment: step; padding-left: 2.5rem; position: relative; margin-bottom: 1.25rem; }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Forms */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.35rem; }
.form-note { font-weight: 400; color: var(--muted); font-size: 0.85rem; }
input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--fg);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: border-color 0.15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}
textarea { min-height: 8rem; resize: vertical; }
select { cursor: pointer; }

/* Tab bar */
.tab-bar {
  position: sticky;
  top: 50px;
  z-index: 9;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0;
  padding-top: 1rem;
}
.tabs {
  display: flex;
  gap: 0;
  align-items: center;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tab-label {
  padding: 1rem 0.75rem 1rem 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
  white-space: nowrap;
}
.tab {
  padding: 1rem 1.25rem;
  border: none;
  background: none;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s, opacity 0.15s;
  opacity: 0.6;
}
.tab:hover { opacity: 0.8; }
.tab.active { opacity: 1; }
.tab.active { font-weight: 600; }
.tab[data-tab="idk"] { color: var(--success); }
.tab[data-tab="idk"].active { color: var(--success); border-bottom-color: var(--success); }
.tab[data-tab="attribution"] { color: #ca8a04; }
.tab[data-tab="attribution"].active { color: #ca8a04; border-bottom-color: #ca8a04; }
.tab[data-tab="strongleft"] { color: #dc2626; }
.tab[data-tab="strongleft"].active { color: #dc2626; border-bottom-color: #dc2626; }
.tab[data-tab="weakleft"] { color: #ea580c; }
.tab[data-tab="weakleft"].active { color: #ea580c; border-bottom-color: #ea580c; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.tab-panel { padding: 0; }
.tab-panel + section { border-top: none; }

/* Panel color themes */
#panel-idk { --panel-accent: var(--success); --panel-accent-hover: #047857; }
#panel-attribution { --panel-accent: #ca8a04; --panel-accent-hover: #a16207; }
#panel-strongleft { --panel-accent: #dc2626; --panel-accent-hover: #b91c1c; }
#panel-weakleft { --panel-accent: #ea580c; --panel-accent-hover: #c2410c; }

/* Colored panel body */
.panel-body {
  background: var(--panel-accent);
  padding: 3rem 0;
}

/* Dark card overlay */
.panel-card {
  background: rgba(10, 10, 10, 0.55);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 24px 4px;
  padding: 1.5rem 2.5rem 2.5rem;
  color: #fff;
}
.panel-card h2 { color: #fff; margin-top: 0.75rem; }
.panel-card h3 { color: rgba(255,255,255,0.9); }
.panel-card .badge {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}
.panel-card .text-muted { color: rgba(255,255,255,0.65); }
.panel-card p { color: rgba(255,255,255,0.88); }
.panel-card ul li { color: rgba(255,255,255,0.88); }
.panel-card .text-sm { color: rgba(255,255,255,0.7); }
.panel-card .text-sm strong { color: #fff; }

/* Divider between content and CTA */
.panel-divider {
  border-top: 1px solid rgba(255,255,255,0.15);
  margin: 2rem 0 1.5rem;
}

/* CTA buttons inside card */
.panel-card h3:last-of-type { text-align: center; }
.panel-card .btn-group {
  justify-content: center;
  gap: 1.5rem;
  position: relative;
}
.panel-card .btn-group .btn {
  min-width: 10rem;
  text-align: center;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
}
.panel-card .btn-group .btn:hover {
  background: rgba(255,255,255,0.25);
}
.panel-card .btn-group .btn:first-child::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 15%;
  bottom: 15%;
  width: 1px;
  background: rgba(255,255,255,0.2);
}

/* Nav dropdown sub-links */
nav .dropdown-menu a.sub { padding-left: 2rem; font-size: 0.85em; }

/* Per-variant page theming */
[data-variant="idk"] { --page-accent: #059669; --page-accent-hover: #047857; }
[data-variant="attribution"] { --page-accent: #ca8a04; --page-accent-hover: #a16207; }
[data-variant="weakleft"] { --page-accent: #ea580c; --page-accent-hover: #c2410c; }
[data-variant="strongleft"] { --page-accent: #dc2626; --page-accent-hover: #b91c1c; }

[data-variant] .hero {
  background: var(--page-accent);
  border-bottom: none;
  color: #fff;
}
[data-variant] .hero h1 { color: #fff; }
[data-variant] .hero .subtitle { color: rgba(255,255,255,0.75); }
[data-variant] .hero .badge {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}
[data-variant] .hero .badge.ok {
  border-color: rgba(255,255,255,0.5);
  color: #fff;
}
[data-variant] .hero .badge.warn {
  border-color: rgba(255,255,255,0.4);
  color: rgba(255,255,255,0.85);
}
[data-variant] .hero .badge.danger {
  border-color: rgba(255,200,200,0.6);
  color: rgba(255,200,200,0.95);
}
[data-variant] .hero .btn-primary {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
}
[data-variant] .hero .btn-primary:hover {
  background: rgba(255,255,255,0.25);
  color: #fff;
}
[data-variant] .hero .btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.3);
}
[data-variant] .hero .btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.5);
  color: #fff;
}
[data-variant] h2 { color: var(--page-accent); }
[data-variant] h3 { color: var(--page-accent); }
[data-variant] .card { border-color: color-mix(in srgb, var(--page-accent) 25%, var(--border)); }
[data-variant] a { color: var(--page-accent); }
[data-variant] a:hover { color: var(--page-accent-hover); }
[data-variant] nav a { color: var(--muted); }
[data-variant] nav a:hover { color: var(--fg); }
[data-variant] nav .logo { color: var(--fg); }
[data-variant] footer a { color: var(--muted); }
[data-variant] footer a:hover { color: var(--fg); }

/* 4 → 2 → 1 grid (never 3+1) */
.grid-2x2 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 1.5rem 0;
}
@media (max-width: 960px) {
  .grid-2x2 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .grid-2x2 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  html { font-size: 16px; }
  .hero h1 { font-size: 2rem; }
  nav ul { gap: 1rem; }
  .tabs {
    flex-wrap: wrap;
    overflow-x: visible;
  }
  .tab-label {
    width: 100%;
    padding-bottom: 0;
  }
  .tab {
    font-size: 0.75rem;
    padding: 1rem 0.75rem;
  }
  .panel-card .btn-group .btn:first-child::after {
    display: none;
  }
}