/* shared.css — Design tokens, reset, typography
   Theme: Dark blueprint · blue primary */

:root {
  /* Surfaces */
  --bg: #0a0e1a;
  --bg-elevated: #141b2e;

  /* Text */
  --fg: #e8ecf7;
  --fg-dim: #a8b0c4;
  --muted: #6a7188;

  /* Brand colors */
  --primary: #3b82f6;    /* blue — active states, primary buttons */
  --accent: #22d3ee;     /* cyan — links, inline code */
  --green: #22c55e;      /* logo dot green */

  /* Borders */
  --border: #232b45;
  --border-dim: #1a2035;
  --border-strong: #4a5678;

  /* Typography */
  --mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', 'Fira Code', Consolas, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 78% 38% at 50% 0%, rgba(59, 130, 246, 0.14), transparent 65%),
    radial-gradient(ellipse 28% 22% at 92% 8%, rgba(34, 211, 238, 0.07), transparent 55%),
    radial-gradient(circle at 2px 2px, rgba(232, 236, 247, 0.025) 1px, transparent 0);
  background-size: 100% 980px, 100% 980px, 28px 28px;
  background-position: 0 0, 0 0, 0 0;
  background-repeat: no-repeat, no-repeat, repeat;
  color: var(--fg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 820px;
  width: 100%;
  padding: 2rem 1.5rem;
}

/* ----- Typography ----- */
h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 0.55rem;
  letter-spacing: -0.01em;
}

h2::before {
  content: '';
  width: 4px;
  height: 1.25rem;
  background: var(--primary);
  border-radius: 2px;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.4rem;
}

p {
  color: var(--fg-dim);
  line-height: 1.7;
}

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

a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.875em;
  color: var(--accent);
  background: rgba(34, 211, 238, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

section {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

/* ----- OS Tabs (install) ----- */
.os-tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.os-tab {
  background: none;
  border: 1px solid var(--border);
  color: var(--fg-dim);
  font-family: var(--sans);
  font-size: 0.875rem;
  padding: 0.35rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.os-tab:hover:not(:disabled) {
  border-color: var(--border-strong);
  color: var(--fg);
}

.os-tab[aria-selected="true"] {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 500;
}

.os-tab:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.soon-tag {
  font-size: 0.65rem;
  background: var(--border-strong);
  color: var(--fg-dim);
  padding: 0.05em 0.4em;
  border-radius: 3px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ----- Install block ----- */
.install-block {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  font-family: var(--mono);
  font-size: 0.875rem;
}

.install-block code {
  background: none;
  padding: 0;
  color: var(--fg);
  word-break: break-all;
}

.label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.copy-btn {
  background: none;
  border: 1px solid var(--border-strong);
  color: var(--fg-dim);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 5px;
  cursor: pointer;
  font-family: var(--sans);
  transition: all 0.15s;
  white-space: nowrap;
}

.copy-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.install-note {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.6rem;
  line-height: 1.5;
}

/* ----- Footer ----- */
footer {
  margin-top: 4rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--border-dim);
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

footer a { color: var(--muted); }
footer a:hover { color: var(--fg-dim); }