@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --base: #1b1a2e;
  --surface: #252343;
  --overlay: #3a3856;
  --overlay-soft: #322f52;
  --text: #e4e1f5;
  --text-dim: #a9a6c4;
  --muted: #726f94;
  --mint: #7fd4c1;
  --mint-dim: #5fb09e;
  --gold: #f5c977;
  --good: #8fd68a;
  --warn: #f0c674;
  --bad: #e8748a;

  --display: 'Space Mono', 'Courier New', monospace;
  --mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--base);
  color: var(--text);
  font-family: var(--mono);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--mint); color: var(--base); }

a { color: var(--mint); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, .tab:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

h1, h2, h3 { font-family: var(--display); font-weight: 700; text-wrap: balance; margin: 0; }

.container {
  width: min(920px, 100% - 3rem);
  margin-inline: auto;
}

/* ---------- Nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--base) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--overlay);
}

.nav-inner {
  width: min(920px, 100% - 3rem);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}

.brand .glyph { color: var(--mint); }
.brand .jp { color: var(--muted); font-size: 0.85rem; font-weight: 400; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.9rem;
}

.nav-links a.current { color: var(--text); }

.btn {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  border: 1px solid var(--mint);
  color: var(--mint);
  background: transparent;
  padding: 0.55rem 1.1rem;
  border-radius: 3px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.btn:hover { background: var(--mint); color: var(--base); text-decoration: none; }

.btn.solid {
  background: var(--mint);
  color: var(--base);
}
.btn.solid:hover { background: var(--mint-dim); }

/* ---------- Views ---------- */

.view { display: none; }
.view.active { display: block; }

/* ---------- Hero ---------- */

.hero {
  padding: 4.5rem 0 3.5rem;
  display: grid;
  gap: 3rem;
}

.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mint);
  margin-bottom: 0.9rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.hero h1 .accent { color: var(--mint); }

.hero p.lede {
  font-family: var(--mono);
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 62ch;
  margin-top: 1.2rem;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.hero-ctas .btn { padding: 0.75rem 1.4rem; font-size: 0.95rem; }

/* ---------- Terminal mockup ---------- */

.term {
  border: 1px solid var(--overlay);
  border-radius: 6px;
  background: var(--surface);
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgb(0 0 0 / 0.55);
}

.term-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.8rem;
  background: var(--overlay-soft);
  border-bottom: 1px solid var(--overlay);
}

.term-dot { width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--overlay); }
.term-title {
  margin-left: 0.6rem;
  font-size: 0.75rem;
  color: var(--muted);
}

.term-tabs {
  display: flex;
  border-bottom: 1px solid var(--overlay);
  font-size: 0.85rem;
}

.term-tabs span {
  padding: 0.6rem 1.1rem;
  color: var(--muted);
  border-right: 1px solid var(--overlay);
}

.term-tabs span.active {
  color: var(--base);
  background: var(--mint);
  font-weight: 600;
}

.term-body {
  padding: 1.1rem 1.2rem 1.3rem;
  font-size: 0.85rem;
}

.gauge-row {
  display: grid;
  grid-template-columns: 6.5rem 1fr 4.5rem;
  align-items: center;
  gap: 0.8rem;
  padding: 0.3rem 0;
  color: var(--text-dim);
}

.gauge-row .label { color: var(--text); }

.bar {
  height: 0.5rem;
  border-radius: 2px;
  background: var(--overlay);
  overflow: hidden;
}
.bar > span { display: block; height: 100%; }
.bar.good > span { background: var(--good); }
.bar.warn > span { background: var(--warn); }
.bar.mint > span { background: var(--mint); }

.term-divider {
  border: none;
  border-top: 1px solid var(--overlay);
  margin: 0.9rem 0;
}

.term-status {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--muted);
  padding: 0.5rem 1.2rem;
  border-top: 1px solid var(--overlay);
  background: var(--overlay-soft);
}

.term-status .mode { color: var(--base); background: var(--mint); padding: 0.1rem 0.5rem; border-radius: 2px; font-weight: 600; }

.cursor {
  display: inline-block;
  width: 0.55ch;
  background: var(--mint);
  animation: blink 1s steps(1) infinite;
}
@media (prefers-reduced-motion: reduce) { .cursor { animation: none; opacity: 1; } }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- Sections ---------- */

section.block { padding: 3.5rem 0; border-top: 1px solid var(--overlay); }

.section-head { margin-bottom: 2rem; max-width: 62ch; }
.section-head h2 { font-size: 1.6rem; margin-bottom: 0.7rem; }
.section-head p { color: var(--text-dim); }

/* Feature table */

.ftable { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.ftable th {
  text-align: left;
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 0.8rem 0.6rem;
  border-bottom: 1px solid var(--overlay);
}
.ftable td {
  padding: 0.85rem 0.8rem;
  border-bottom: 1px solid var(--overlay);
  vertical-align: top;
  color: var(--text-dim);
}
.ftable tr:last-child td { border-bottom: none; }
.ftable td.name { color: var(--text); font-weight: 600; white-space: nowrap; }
.ftable td.name .tag {
  display: inline-block;
  margin-left: 0.5rem;
  font-size: 0.68rem;
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
  background: var(--overlay);
  color: var(--gold);
  font-weight: 600;
  vertical-align: middle;
}

/* Principles */

.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.principle {
  border: 1px solid var(--overlay);
  border-radius: 6px;
  padding: 1.4rem;
  background: var(--surface);
}
.principle h3 { font-size: 0.95rem; color: var(--mint); margin-bottom: 0.6rem; }
.principle p { color: var(--text-dim); font-size: 0.88rem; margin: 0; }

/* Footer */

footer { padding: 3rem 0 4rem; color: var(--muted); font-size: 0.85rem; }
footer .foot-row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; border-top: 1px solid var(--overlay); padding-top: 1.5rem; }
footer a { color: var(--text-dim); }

/* ---------- Download view ---------- */

.download-head { padding: 3.5rem 0 1rem; }
.download-head h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.download-head p { color: var(--text-dim); max-width: 60ch; margin-top: 0.8rem; }

.os-tabs {
  display: flex;
  gap: 0.5rem;
  margin: 2rem 0 1.5rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--overlay);
  padding-bottom: 0;
}

.tab {
  font-family: var(--mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-dim);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.7rem 0.9rem;
  cursor: pointer;
}

.tab.active { color: var(--mint); border-bottom-color: var(--mint); }
.tab:hover:not(.active) { color: var(--text); }

.os-panel { display: none; }
.os-panel.active { display: block; }

.status-note {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--gold);
  background: color-mix(in srgb, var(--gold) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--gold) 35%, transparent);
  padding: 0.15rem 0.55rem;
  border-radius: 3px;
  margin-bottom: 1rem;
}

.step { margin-bottom: 1.6rem; }
.step .step-label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.code-block {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--overlay);
  border-radius: 6px;
  padding: 1rem 3.2rem 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.code-block pre { margin: 0; white-space: pre; }
.code-block .comment { color: var(--muted); }
.code-block .str { color: var(--gold); }

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  background: var(--overlay-soft);
  border: 1px solid var(--overlay);
  border-radius: 3px;
  padding: 0.3rem 0.55rem;
  cursor: pointer;
}
.copy-btn:hover { color: var(--mint); border-color: var(--mint); }
.copy-btn.copied { color: var(--good); border-color: var(--good); }

.setup-callouts { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2.5rem; }
.callout {
  border: 1px solid var(--overlay);
  border-left: 3px solid var(--mint);
  border-radius: 4px;
  padding: 1rem 1.1rem;
  background: var(--surface);
  font-size: 0.85rem;
  color: var(--text-dim);
}
.callout strong { color: var(--text); display: block; margin-bottom: 0.3rem; font-family: var(--mono); }

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .principles { grid-template-columns: 1fr; }
  .setup-callouts { grid-template-columns: 1fr; }
  .nav-links { gap: 1rem; }
  .term-body { font-size: 0.78rem; }
  .gauge-row { grid-template-columns: 5rem 1fr 3.5rem; }
}