/* ─────────────────────────────────────────────────────────────
   Umbrella · marketing site
   minimalist B&W. Geist for prose & headlines, IBM Plex Mono
   for technical bits.
   ───────────────────────────────────────────────────────────── */

:root {
  /* tones */
  --bg:        #050505;
  --bg-elev:   #0c0c0c;
  --bg-card:   #0a0a0a;
  --fg:        #fafafa;
  --fg-mid:    #c8c8c8;
  --muted:     #888;
  --dim:       #555;
  --line:      #1a1a1a;
  --line-2:    #2a2a2a;

  /* type */
  --sans: 'Geist', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* layout */
  --max:       1180px;
  --pad-x:     32px;
  --pad-y-lg:  120px;
  --pad-y-md:  72px;

  /* timing */
  --t: 120ms;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--fg); color: var(--bg); }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--fg); }

img, svg { display: block; max-width: 100%; }

button { font-family: inherit; font-size: inherit; cursor: pointer; }


/* ─────────── layout primitives ─────────── */

.shell {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.section {
  padding-top: var(--pad-y-lg);
  padding-bottom: var(--pad-y-lg);
}

.section--md {
  padding-top: var(--pad-y-md);
  padding-bottom: var(--pad-y-md);
}

.divider {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}


/* ─────────── header ─────────── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .shell {
  display: flex;
  align-items: center;
  height: 60px;
  gap: 32px;
}
.brand {
  display: inline-flex; align-items: baseline; gap: 10px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.02em;
  color: var(--fg);
}
.brand .dot { color: var(--fg); }

/* ALPHA chip — sits inline next to the brand mark */
.alpha-chip {
  display: inline-block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  font-weight: 500;
  padding: 2px 7px;
  border: 1px solid var(--line-2);
  color: var(--fg-mid);
  text-transform: uppercase;
  vertical-align: middle;
  position: relative;
  top: -2px;
}

/* Big-format callout used on /install and /docs */
.callout {
  border: 1px solid var(--line-2);
  background: var(--bg-elev);
  padding: 22px 26px;
  margin: 0 0 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
}
.callout-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg);
  padding: 4px 8px;
  border: 1px solid var(--fg);
  font-weight: 500;
  white-space: nowrap;
  align-self: start;
  margin-top: 1px;
}
.callout-body {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--fg-mid);
  letter-spacing: -0.005em;
}
.callout-body strong { color: var(--fg); font-weight: 500; }
.callout-body a { color: var(--fg); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line-2); }
.callout-body a:hover { text-decoration-color: var(--fg); }
.nav {
  display: flex; align-items: center; gap: 28px;
  margin-left: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav a {
  color: var(--muted);
  transition: color var(--t);
}
.nav a:hover, .nav a.is-active { color: var(--fg); }
.nav-spacer { flex: 1; }
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--line-2);
  padding: 8px 14px;
  color: var(--fg);
  transition: all var(--t);
}
.nav-cta:hover {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}


/* ─────────── footer ─────────── */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 80px;
  padding: 56px 0 64px;
}
.site-footer .shell {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}
.site-footer h4 {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  margin: 0 0 14px;
}
.site-footer ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 8px;
  font-size: 13px;
}
.site-footer a { color: var(--fg-mid); transition: color var(--t); }
.site-footer a:hover { color: var(--fg); }
.site-footer .legal {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--dim);
  display: flex; align-items: center; justify-content: space-between;
}
.site-footer .blurb {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.45;
  letter-spacing: -0.005em;
  color: var(--fg-mid);
  max-width: 36ch;
  margin-top: 14px;
}


/* ─────────── typography utilities ─────────── */

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 22px;
  height: 1px;
  background: currentColor;
}

.headline {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.04;
  color: var(--fg);
}
.headline.size-xl { font-size: clamp(36px, 4.6vw, 64px); }
.headline.size-lg { font-size: clamp(28px, 3.4vw, 44px); }
.headline.size-md { font-size: clamp(22px, 2.6vw, 32px); }

.lede {
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg-mid);
  letter-spacing: -0.005em;
  max-width: 60ch;
}

.label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}

code, .code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  padding: 1px 6px;
  color: var(--fg);
}


/* ─────────── buttons ─────────── */

.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 11px 18px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--fg);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
  transition: all var(--t);
  white-space: nowrap;
}
.btn:hover {
  /* Subtle: just brighten the border + nudge the arrow.
     No background fill — the user wants the outline to stay clean. */
  border-color: var(--fg);
  color: var(--fg);
}
.btn .arrow {
  transition: transform var(--t);
}
.btn:hover .arrow {
  transform: translateX(3px);
}
.btn--solid {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn--solid:hover {
  /* Primary keeps its filled style on hover — only the arrow nudges.
     We restate background/color so they don't inherit `.btn:hover`. */
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn--ghost {
  border-color: transparent;
  padding-left: 4px; padding-right: 4px;
  color: var(--fg-mid);
}
.btn--ghost:hover {
  background: transparent;
  color: var(--fg);
}


/* ─────────── hero ─────────── */

.hero {
  padding-top: 96px;
  padding-bottom: 88px;
  position: relative;
  text-align: center;
}
.hero .shell {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero .eyebrow { justify-content: center; }
.hero h1 {
  margin: 22px 0 22px;
  max-width: 18ch;
}
.hero .lede {
  margin-left: auto;
  margin-right: auto;
  max-width: 56ch;
}
.hero-actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.hero-meta {
  margin-top: 44px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero-meta strong {
  color: var(--fg);
  font-weight: 500;
}

.hero-diagram {
  margin: 80px auto 0;
  width: 100%;
  max-width: 1080px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  position: relative;
  overflow: hidden;
}
.hero-diagram > svg {
  width: 100%;
  height: auto;
  display: block;
}


/* ─────────── feature grid ─────────── */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.grid-3 > * {
  background: var(--bg);
  padding: 36px 32px;
}
.feature {
  display: flex;
  flex-direction: column;
  min-height: 200px;
}
.feature-num {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  letter-spacing: 0.18em;
  margin-bottom: 28px;
  text-transform: uppercase;
}
.feature-title {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: -0.012em;
  line-height: 1.3;
  margin: 0 0 14px;
  color: var(--fg);
}
.feature-desc {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--fg-mid);
  letter-spacing: -0.005em;
  margin: 0;
  flex: 1;
}
.feature-desc code {
  font-size: 0.92em;
  padding: 1px 5px;
}


/* ─────────── section header ─────────── */

.section-head {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: end;
  margin-bottom: 48px;
}
.section-head .lede { margin-top: 0; }
@media (max-width: 800px) {
  .section-head { grid-template-columns: 1fr; gap: 24px; }
}

/* a centered variant for centered sections */
.section-head--center {
  display: block;
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}
.section-head--center .eyebrow { justify-content: center; }
.section-head--center .lede { margin-left: auto; margin-right: auto; }


/* ─────────── code block ─────────── */

.codeblock {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--fg);
  overflow: hidden;
}
.codeblock-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex; align-items: center; justify-content: space-between;
}
.codeblock-header .dots { display: inline-flex; gap: 5px; }
.codeblock-header .dots > i {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 999px;
  background: var(--line-2);
}
.codeblock pre {
  margin: 0;
  padding: 20px 24px;
  overflow-x: auto;
}
.codeblock pre .c    { color: var(--dim); }
.codeblock pre .k    { color: var(--fg); }
.codeblock pre .s    { color: var(--fg-mid); }
.codeblock pre .n    { color: var(--fg); }
.codeblock pre .p    { color: var(--muted); }


/* ─────────── stats strip ─────────── */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.stats > div {
  background: var(--bg);
  padding: 28px;
}
.stat-num {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 36px;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}
.stat-label {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}


/* ─────────── docs / install layout ─────────── */

.doc {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 64px;
  align-items: start;
}
.doc-toc {
  position: sticky;
  top: 96px;
  font-family: var(--mono);
  font-size: 12px;
}
.doc-toc h4 {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.doc-toc ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 6px;
}
.doc-toc a {
  display: block;
  color: var(--fg-mid);
  padding: 4px 0;
  border-left: 1px solid var(--line);
  padding-left: 12px;
  transition: all var(--t);
}
.doc-toc a:hover {
  color: var(--fg);
  border-left-color: var(--fg);
}
.doc-content > section {
  margin-bottom: 64px;
}
.doc-content h2 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 30px;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 20px;
  scroll-margin-top: 96px;
}
.doc-content h3 {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 28px 0 14px;
  color: var(--fg);
}
.doc-content p {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--fg-mid);
  margin: 0 0 16px;
  max-width: 64ch;
}
.doc-content ul {
  margin: 0 0 16px;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-mid);
}
.doc-content ul li { margin-bottom: 6px; }
.doc-content ul li::marker { color: var(--dim); }

.kvs {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 12px;
  margin: 14px 0 22px;
}
.kvs th, .kvs td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}
.kvs th {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.kvs td:first-child { color: var(--fg); }
.kvs td { color: var(--fg-mid); vertical-align: top; }


/* ─────────── browser mockup (demo page) ─────────── */

.browser {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  overflow: hidden;
}
.browser-bar {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: #0e0e0e;
}
.browser-bar .dots { display: inline-flex; gap: 6px; }
.browser-bar .dots > i {
  display: inline-block;
  width: 11px; height: 11px;
  border-radius: 999px;
  background: var(--line-2);
}
.browser-bar .url {
  flex: 1;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background: var(--bg);
  padding: 6px 14px;
  border: 1px solid var(--line);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.browser-content {
  background: #0a0b0e;
  color: #e6e4df;
  font-family: 'IBM Plex Mono', monospace;
}


/* ─────────── 404 ─────────── */

.notfound {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
}
.notfound h1 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(48px, 8vw, 96px);
  letter-spacing: -0.03em;
  line-height: 1;
}


/* No entrance animations — minimalist means seeing the content
   immediately, not waiting for it. */
.reveal { /* intentionally empty */ }


/* ─────────── responsive ─────────── */

@media (max-width: 960px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .doc { grid-template-columns: 1fr; gap: 32px; }
  .doc-toc { position: static; }
  .site-footer .shell { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  :root { --pad-y-lg: 80px; --pad-y-md: 56px; }
  .grid-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
  .site-footer .shell { grid-template-columns: 1fr; }
  .nav { gap: 18px; font-size: 10.5px; }
  .hero { padding-top: 56px; }
  .hero-meta { gap: 14px; }
}