/* --- Theme tokens ---------------------------------------------------- */

:root,
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg:        #0b0d12;
  --bg-elev:   #11141b;
  --bg-card:   #141922;
  --bg-glow:   rgba(122, 162, 247, 0.15);
  --fg:        #e6e8ee;
  --fg-2:      #c5cbd9;
  --fg-3:      #cdd3df;
  --muted:     #8a93a6;
  --border:    #1f2533;
  --accent:    #7aa2f7;
  --accent-fg: #0b0d12;
  --accent-hover: #9bb8f9;
  --accent-2:  #bb9af7;
  --success:   #9ece6a;
  --code-bg:   #1a1f2b;
  --shadow:    0 1px 0 rgba(255, 255, 255, 0.02) inset;
  --hero-grad-from: #ffffff;
  --hero-grad-to:   #c3ccdf;
  --chip-accent-bg:     rgba(187, 154, 247, 0.12);
  --chip-accent-border: rgba(187, 154, 247, 0.35);
  --chip-ok-bg:         rgba(158, 206, 106, 0.15);
  --chip-ok-border:     rgba(158, 206, 106, 0.45);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg:        #fafbfc;
  --bg-elev:   #ffffff;
  --bg-card:   #ffffff;
  --bg-glow:   rgba(56, 102, 221, 0.10);
  --fg:        #0e1116;
  --fg-2:      #2b3038;
  --fg-3:      #3a414c;
  --muted:     #5b6573;
  --border:    #e2e6ec;
  --accent:    #3866dd;
  --accent-fg: #ffffff;
  --accent-hover: #2a52c3;
  --accent-2:  #7c4ad9;
  --success:   #2f7d2f;
  --code-bg:   #f1f3f6;
  --shadow:    0 1px 2px rgba(15, 23, 42, 0.04);
  --hero-grad-from: #0e1116;
  --hero-grad-to:   #4a5160;
  --chip-accent-bg:     rgba(124, 74, 217, 0.10);
  --chip-accent-border: rgba(124, 74, 217, 0.30);
  --chip-ok-bg:         rgba(47, 125, 47, 0.12);
  --chip-ok-border:     rgba(47, 125, 47, 0.35);
}

:root {
  --radius: 12px;
  --max: 1120px;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  background:
    radial-gradient(1200px 600px at 50% -200px, var(--bg-glow), transparent),
    var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 1rem;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  font-weight: 600;
  z-index: 10;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 1rem; text-decoration: none; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 6px;
  font-size: 0.92em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92rem;
  line-height: 1.55;
}
pre code { background: transparent; padding: 0; }

.nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--fg);
  font-weight: 600;
  letter-spacing: -0.005em;
  font-size: 1rem;
  line-height: 1;
}
.nav-logo:hover { text-decoration: none; color: var(--accent); }
.nav-logo-mark {
  width: 1.4rem;
  height: 1.4rem;
  flex-shrink: 0;
  color: var(--fg);
  transition: color 0.15s ease, transform 0.2s ease;
}
.nav-logo:hover .nav-logo-mark { transform: rotate(8deg); }
.nav-logo-mark .nav-logo-dot { color: var(--accent); }
.nav-logo-word {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95rem;
}

.nav-links { display: flex; align-items: center; gap: 1.25rem; }
.nav-links a { color: var(--muted); font-size: 0.95rem; }
.nav-links a:hover { color: var(--fg); text-decoration: none; }

.hero { padding-bottom: 3rem; }
.hero-content {
  max-width: var(--max);
  margin: 3rem auto 0;
  padding: 0 1.5rem;
  text-align: center;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--accent-2);
  margin: 0 0 0.75rem;
}
h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  background: linear-gradient(180deg, var(--hero-grad-from), var(--hero-grad-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  max-width: 780px;
  margin: 0 auto 1.8rem;
  color: var(--fg-3);
  font-size: 1.08rem;
}

.cta {
  display: inline-flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.1rem;
  border-radius: 10px;
  font-weight: 500;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent); }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
}
.btn-ghost:hover { border-color: var(--accent); }

.terminal {
  max-width: 720px;
  margin: 0 auto;
  text-align: left;
  background: var(--bg-elev);
  border: 1px solid var(--border);
}
.prompt {
  color: var(--success);
  user-select: none;
  margin-right: 0.5rem;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}
.section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}
.section-lede { color: var(--muted); margin: 0 0 2rem; }

.grid { display: grid; gap: 1rem; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.card, .skill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, transform 0.08s ease, background-color 0.2s ease;
}
.card:hover, .skill:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.card h3, .skill h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.card p, .skill p {
  margin: 0.35rem 0;
  color: var(--fg-2);
  font-size: 0.95rem;
}
.trigger {
  color: var(--muted);
  font-size: 0.85rem;
  font-style: italic;
}

.steps, .principles {
  padding-left: 1.1rem;
  display: grid;
  gap: 1.2rem;
  margin: 0;
}
.steps li, .principles li { padding-left: 0.3rem; }
.steps h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.steps pre { margin: 0.5rem 0; }
.steps p { margin: 0.5rem 0 0; color: var(--fg-2); }
.roadmap { padding-left: 1.1rem; color: var(--fg-2); }
.roadmap li { margin: 0.3rem 0; }

.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.5rem 3rem;
  background: var(--bg-elev);
  margin-top: 2rem;
}
.footer-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.footer-logo {
  margin: 0 0 0.3rem;
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--accent);
}
.muted { color: var(--muted); }
.muted a { color: var(--muted); }
.muted a:hover { color: var(--fg); }
.center {
  text-align: center;
  margin-top: 1.6rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .nav-links a:not(.btn) { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-content { margin-top: 1.5rem; }
}

/* --- Install page --------------------------------------------------- */

.hero-compact { padding-bottom: 1rem; }
.hero-compact .hero-content { margin-top: 2rem; }

.nav-links a[aria-current="page"] {
  color: var(--fg);
  position: relative;
}
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.chip {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.1rem 0.5rem;
  margin-left: 0.35rem;
  background: var(--chip-accent-bg);
  color: var(--accent-2);
  border: 1px solid var(--chip-accent-border);
  border-radius: 999px;
  text-transform: lowercase;
  letter-spacing: 0.03em;
  vertical-align: middle;
  font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
}
.chip-ok {
  background: var(--chip-ok-bg);
  color: var(--success);
  border-color: var(--chip-ok-border);
}

.subhead {
  margin: 2rem 0 0.75rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.install-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.5rem;
}
.install-steps > li {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
}
.install-step-head {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
}
.install-step-head h3 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95rem;
  flex-shrink: 0;
}
.install-steps p {
  margin: 0.6rem 0 0;
  color: var(--fg-2);
}
.install-steps p.hint,
p.hint {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.7rem;
}
.hint-center { text-align: center; }

.copy-block {
  position: relative;
}
.copy-block pre {
  margin: 0;
  padding-right: 5rem;
}
.copy-hero {
  max-width: 720px;
  margin: 0 auto 1rem;
  text-align: left;
}
.copy-hero pre {
  background: var(--bg-elev);
}
.btn-copy {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  background: var(--bg-card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn-copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-copy.is-copied {
  border-color: var(--success);
  color: var(--success);
}

.mapping {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.mapping-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
}
.mapping-src { justify-self: end; }
.mapping-dest { justify-self: start; color: var(--accent); }
.mapping-arrow { color: var(--muted); font-family: ui-monospace, monospace; }

.notes {
  padding-left: 1.1rem;
  color: var(--fg-2);
  display: grid;
  gap: 0.5rem;
}

.callout {
  margin-top: 1.5rem;
  padding: 1rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--fg-2);
  font-size: 0.95rem;
  line-height: 1.55;
}
.callout-info {
  border-left: 3px solid var(--accent);
}
.callout strong { color: var(--fg); }

.faq {
  display: grid;
  gap: 1rem;
  margin: 0;
}
.faq dt {
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.2rem;
}
.faq dd {
  margin: 0 0 0.3rem;
  color: var(--fg-2);
  padding-left: 0;
}
.faq dd + dt { margin-top: 0.5rem; }

@media (max-width: 560px) {
  .mapping-row {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .mapping-src, .mapping-dest { justify-self: start; }
  .mapping-arrow { display: none; }
  .copy-block pre {
    padding-right: 1.2rem;
    padding-top: 3rem;
  }
  .btn-copy {
    top: 0.55rem;
    right: 0.55rem;
  }
}

/* --- Theme toggle --------------------------------------------------- */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 8px;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  cursor: pointer;
  font: inherit;
  padding: 0;
  margin-left: 0.25rem;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.theme-toggle svg {
  width: 1rem;
  height: 1rem;
  display: block;
}
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

@media (max-width: 640px) {
  .theme-toggle { margin-left: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}