:root {
  --bg: #111;
  --surface: #191919;
  --border: #282828;
  --green: #4ae68a;
  --text: #d4d4d4;
  --dim: #666;
  --code-bg: #161616;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

.w { max-width: 640px; margin: 0 auto; padding: 0 20px; }

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

/* ---- top bar ---- */
header {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  background: rgba(17,17,17,0.92);
  backdrop-filter: blur(8px);
  z-index: 10;
}
header .w {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo, a.logo {
  color: var(--green);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.5px;
  text-decoration: none;
}
a.logo:hover { color: var(--green); text-decoration: none; }
.hdr-links { display: flex; gap: 20px; }
.hdr-links a { color: var(--dim); font-size: 13px; }
.hdr-links a:hover { color: var(--text); text-decoration: none; }

/* ---- hero ---- */
.hero {
  padding: 100px 0 72px;
}
.hero h1 {
  font-size: 44px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 16px;
}
.hero h1 em, .highlight {
  font-style: normal;
  color: var(--green);
}
.hero .tagline {
  color: var(--dim);
  font-size: 15px;
  line-height: 1.7;
  max-width: 420px;
  margin-bottom: 36px;
}

/* install bar */
.install-bar {
  display: flex;
  align-items: stretch;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  max-width: 460px;
  overflow: hidden;
}
.install-bar code {
  flex: 1;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow-x: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.install-bar code .ps { color: var(--green); user-select: none; }
.install-bar button {
  background: var(--surface);
  border: none;
  border-left: 1px solid var(--border);
  color: var(--dim);
  padding: 0 14px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: color 0.15s;
}
.install-bar button:hover { color: var(--green); }
.install-bar button.ok { color: var(--green); }

/* install tabs */
.install-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.tab-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--dim);
  padding: 6px 12px;
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tab-btn:hover {
  color: var(--text);
  border-color: var(--dim);
}
.tab-btn.active {
  background: var(--code-bg);
  color: var(--green);
  border-color: var(--green);
}
.tab-content {
  display: none !important;
}
.tab-content.active {
  display: flex !important;
}

/* ---- section dividers ---- */
.sep { border: none; border-top: 1px solid var(--border); margin: 0; }

/* ---- demo section ---- */
.demo { padding: 64px 0; }
.demo h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--dim);
  margin-bottom: 32px;
  font-weight: 500;
}

.terminal {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.terminal-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--border);
}
.terminal-bar span {
  margin-left: 8px;
  font-size: 11px;
  color: var(--dim);
}
.terminal pre {
  padding: 20px;
  font-size: 13px;
  line-height: 1.8;
  overflow-x: auto;
  color: var(--text);
}
.terminal .p { color: var(--green); user-select: none; }
.terminal .c { color: #888; font-style: italic; }
.terminal .o { color: var(--dim); }
.terminal .s { color: #d19a66; }
.terminal .h { color: #61afef; }

/* ---- commands ---- */
.commands { padding: 64px 0; }
.commands h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--dim);
  margin-bottom: 24px;
  font-weight: 500;
}
.cmd-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--code-bg);
}
.cmd-grid .k, .cmd-grid .v {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.cmd-grid .k {
  color: var(--green);
  border-right: 1px solid var(--border);
  white-space: nowrap;
  background: var(--code-bg);
}
.cmd-grid .v { color: var(--dim); background: var(--surface); }
.cmd-grid .k:last-of-type,
.cmd-grid .v:last-of-type { border-bottom: none; }

/* ---- why ---- */
.why { padding: 64px 0; }
.why h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--dim);
  margin-bottom: 28px;
  font-weight: 500;
}
.why ul { list-style: none; }
.why li {
  color: var(--dim);
  font-size: 14px;
  padding: 8px 0;
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.why li::before {
  content: '—';
  color: var(--border);
  flex-shrink: 0;
}
.why li b { color: var(--text); font-weight: 600; }

/* ---- install section ---- */
.inst { padding: 64px 0; }
.inst h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--dim);
  margin-bottom: 28px;
  font-weight: 500;
}
.inst-label {
  font-size: 12px;
  color: var(--dim);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}
.inst-label .rec {
  color: var(--green);
  border: 1px solid rgba(74,230,138,0.25);
  background: rgba(74,230,138,0.06);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 10px;
  margin-left: 6px;
  vertical-align: 1px;
}
.inst-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 28px;
}
.inst-block pre {
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.8;
  overflow-x: auto;
}
.inst-block .p { color: var(--green); user-select: none; }

/* ---- footer ---- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}
footer .w {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.foot-left { color: var(--dim); font-size: 12px; }
.foot-right { display: flex; gap: 16px; }
.foot-right a { color: var(--dim); font-size: 12px; }
.foot-right a:hover { color: var(--text); text-decoration: none; }

/* ---- article pages (philosophy, guides) ---- */
body.page-article {
  line-height: 1.8;
  font-size: 15px;
}
body.page-article > .w {
  max-width: 600px;
  margin: 0 auto;
  padding: 48px 20px 0;
}
body.page-article main h1 {
  font-size: 24px;
  color: #fff;
  margin-bottom: 30px;
  letter-spacing: -0.5px;
}
body.page-article main h2 {
  font-size: 18px;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
body.page-article main p { margin-bottom: 24px; }
body.page-article main hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}
body.page-article .quote {
  border-left: 2px solid var(--green);
  padding-left: 20px;
  font-style: italic;
  color: #fff;
  margin: 40px 0;
}
body.page-article footer { margin-top: 80px; }
body.page-article main pre.example {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.8;
  overflow-x: auto;
  margin-bottom: 24px;
  color: var(--text);
}
body.page-article main pre.example .ex-c { color: var(--green); }
body.page-article main pre.example .ex-d { color: var(--dim); }
body.page-article main pre.example .ex-ok { color: var(--green); }
body.page-article main code {
  color: var(--green);
  font-size: 0.95em;
}
body.page-article .guide-list {
  list-style: none;
  margin-bottom: 24px;
}
body.page-article .guide-list li {
  color: var(--dim);
  font-size: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
body.page-article .guide-list li:last-child { border-bottom: none; }
body.page-article .guide-list li b { color: var(--text); font-weight: 600; }

/* ---- responsive ---- */
@media (max-width: 520px) {
  .hero h1 { font-size: 32px; }
  .hdr-links a:not(:last-child) { display: none; }
  .cmd-grid { font-size: 12px; }
  footer .w { flex-direction: column; text-align: center; }
}