/* stone-llama site — hand-written, no build step, no dependencies.
   Token layer mirrors site/STYLEGUIDE.md; change values there first.
   Aesthetic: engineering-honest / spec-sheet — neutral graphite ground,
   one teal accent, semantic status colours only, border-depth (no
   shadows, no gradients, no decorative motion). */

/* ---------- token layer: dark (default) ---------- */
:root {
  color-scheme: dark;
  --bg: #0c1013;
  --bg-raise: #12171b;
  --panel: #161c21;
  --line: #232b31;          /* decorative hairline */
  --line-strong: #606a71;   /* control boundaries, >= 3:1 */
  --fg: #e9eef1;
  --fg-2: #c5ced4;
  --muted: #97a3ab;
  --accent: #4cc3d6;
  --accent-ink: #06242a;
  --accent-soft: rgba(76, 195, 214, 0.12);
  --row-tint: color-mix(in srgb, #4cc3d6 12%, #12171b);
  --ok: #5fca8e;
  --warn: #eab45f;
  --bad: #f28b7d;
  --est: #8fb4c4;

  --sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.375rem;
  --fs-2xl: clamp(1.5rem, 3.2vw, 2rem);
  --fs-3xl: clamp(2rem, 5vw, 3rem);
  --lh-body: 1.6;
  --lh-tight: 1.15;

  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;

  --r-sm: 4px;
  --r-md: 8px;
  --dur: 0.15s;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f4ef;
  --bg-raise: #efece4;
  --panel: #eae7de;
  --line: #d5d0c4;
  --line-strong: #8a867a;
  --fg: #14191d;
  --fg-2: #39434a;
  --muted: #5a646b;
  --accent: #0d6b70;
  --accent-ink: #ffffff;
  --accent-soft: rgba(13, 107, 112, 0.09);
  --row-tint: color-mix(in srgb, #0d6b70 9%, #efece4);
  --ok: #146b45;
  --warn: #7a5100;
  --bad: #a33520;
  --est: #3a6a8a;
}

/* No JS: follow the OS preference; with JS, data-theme wins (set by the
   inline head script from localStorage, else left unset). */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;
    --bg: #f6f4ef;
    --bg-raise: #efece4;
    --panel: #eae7de;
    --line: #d5d0c4;
    --line-strong: #8a867a;
    --fg: #14191d;
    --fg-2: #39434a;
    --muted: #5a646b;
    --accent: #0d6b70;
    --accent-ink: #ffffff;
    --accent-soft: rgba(13, 107, 112, 0.09);
    --row-tint: color-mix(in srgb, #0d6b70 9%, #efece4);
    --ok: #146b45;
    --warn: #7a5100;
    --bad: #a33520;
    --est: #3a6a8a;
  }
}

/* Terminal captures: fixed dark in both themes — they are verbatim output
   from a dark terminal, so they never flip with the page theme. */
:root {
  --term-bg: #070b0e;
  --term-bar: #0e1418;
  --term-line: #1c262d;
  --term-fg: #cfd8dc;
  --term-cmd: #74cfe0;
  --term-c: #8497a1;
  --term-ok: #62cc8e;
  --term-warn: #f0b45f;
  --term-bad: #ff9a8a;
}

/* ---------- base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: auto; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

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

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--accent-soft);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 0.08em 0.35em;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--accent-ink);
  padding: var(--sp-3) var(--sp-4);
  font-weight: 600;
}
.skip:focus { left: 0; }

.wrap {
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 2.5rem);
}

/* ---------- header ---------- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.head-row {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  min-height: 54px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--mono);
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--fg);
  text-decoration: none;
}
.brand img { border-radius: var(--r-sm); }
.brand:hover { color: var(--accent); }

.site-head nav { margin-left: auto; }
.site-head nav ul {
  display: flex;
  gap: var(--sp-5);
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-head nav a {
  font-size: var(--fs-sm);
  color: var(--muted);
  text-decoration: none;
  transition: color var(--dur) ease;
}
.site-head nav a:hover { color: var(--fg); }

.head-actions { display: flex; align-items: center; gap: var(--sp-3); }

#theme-toggle {
  display: none;           /* only with JS (html.js) — it changes state */
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--fg-2);
  cursor: pointer;
  transition: border-color var(--dur) ease, color var(--dur) ease;
}
html.js #theme-toggle { display: inline-flex; }
#theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
#theme-toggle .ic-sun { display: none; }
html[data-theme="light"] #theme-toggle .ic-sun { display: block; }
html[data-theme="light"] #theme-toggle .ic-moon { display: none; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font: 600 var(--fs-sm)/1.2 var(--sans);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur) ease, border-color var(--dur) ease, color var(--dur) ease;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { border-color: var(--line-strong); color: var(--fg); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- hero ---------- */

.hero {
  border-bottom: 1px solid var(--line);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}
.hero-copy { max-width: 760px; }

.eyebrow {
  font: 600 var(--fs-xs)/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--sp-4);
}

h1 {
  font-size: var(--fs-3xl);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  font-weight: 600;
  margin: 0 0 var(--sp-4);
}

.lede {
  font-size: var(--fs-lg);
  line-height: 1.55;
  color: var(--fg-2);
  max-width: 60ch;
  margin: 0 0 var(--sp-5);
}

/* the two differentiators, first screen */
.diffs {
  list-style: none;
  margin: 0 0 var(--sp-5);
  padding: 0;
  display: grid;
  gap: var(--sp-4);
}
.diffs li {
  border-top: 1px solid var(--line);
  padding-top: var(--sp-3);
  color: var(--fg-2);
  max-width: 68ch;
}
.diffs strong { color: var(--fg); font-weight: 600; }

.install {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: var(--bg-raise);
  overflow: hidden;
  max-width: 640px;
}
.install code {
  flex: 1;
  min-width: 0;
  border: 0;
  background: none;
  border-radius: 0;
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-sm);
  overflow-x: auto;
  white-space: nowrap;
  color: var(--fg);
  -webkit-user-select: all;
  user-select: all;
}
.copy {
  display: none;           /* JS-only affordance; code stays selectable */
  border: 0;
  border-left: 1px solid var(--line-strong);
  background: transparent;
  color: var(--accent);
  font: 600 var(--fs-xs)/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-inline: var(--sp-4);
  cursor: pointer;
  transition: background var(--dur) ease, color var(--dur) ease;
}
html.js .copy { display: inline-block; }
.copy:hover { background: var(--accent); color: var(--accent-ink); }

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin: var(--sp-5) 0 var(--sp-4);
}

.fine {
  font-size: var(--fs-sm);
  color: var(--muted);
  margin: var(--sp-2) 0 0;
}

/* ---------- sections ---------- */

.sect {
  padding-block: clamp(2.75rem, 7vw, 5rem);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 64px;
}

h2 {
  font-size: var(--fs-2xl);
  line-height: var(--lh-tight);
  letter-spacing: -0.015em;
  font-weight: 600;
  margin: 0 0 var(--sp-4);
  max-width: 28ch;
}

h3 {
  font-size: var(--fs-xl);
  line-height: var(--lh-tight);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 var(--sp-3);
}

.sect-lede {
  font-size: var(--fs-base);
  color: var(--fg-2);
  max-width: 72ch;
  margin: 0 0 var(--sp-6);
}

.est { color: var(--est); font-family: var(--mono); font-size: 0.85em; white-space: nowrap; }
.dim { color: var(--muted); }
.ok, .bad, .warn { font-weight: 600; }
.ok { color: var(--ok); }
.bad { color: var(--bad); }
.warn { color: var(--warn); }

/* ---------- features (01) ---------- */

.features {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.6rem, 4vw, 3rem);
}
.feature {
  border-top: 1px solid var(--line-strong);
  padding-top: var(--sp-5);
}
.feature p { color: var(--fg-2); max-width: 62ch; }

.stat {
  border: 1px solid var(--line);
  background: var(--bg-raise);
  border-radius: var(--r-md);
  padding: var(--sp-4) var(--sp-5);
  margin: 0;
  color: var(--fg-2);
  font-size: var(--fs-sm);
}
.stat-n {
  display: block;
  font: 600 1.75rem/1.1 var(--mono);
  color: var(--accent);
  margin-bottom: var(--sp-1);
}

/* caveat callout */
.caveat {
  border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--line));
  border-left: 3px solid var(--warn);
  background: color-mix(in srgb, var(--warn) 7%, var(--bg-raise));
  border-radius: var(--r-md);
  padding: var(--sp-5);
  margin-top: var(--sp-5);
}
.caveat h3 { color: var(--warn); font-size: var(--fs-base); }
.caveat p { margin: 0 0 var(--sp-3); color: var(--fg-2); max-width: 76ch; }
.caveat p:last-child { margin-bottom: 0; }

/* ---------- terminal captures (02) ---------- */

.term-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-4);
}

.term {
  margin: 0;
  background: var(--term-bg);
  border: 1px solid var(--term-line);
  border-radius: var(--r-md);
  overflow: hidden;
  color: var(--term-fg);
}

.term-bar {
  display: flex;
  align-items: center;
  padding: var(--sp-2) var(--sp-4);
  background: var(--term-bar);
  border-bottom: 1px solid var(--term-line);
  font: 500 var(--fs-xs)/1.5 var(--mono);
  color: var(--term-c);
}

.term pre {
  margin: 0;
  padding: var(--sp-4) var(--sp-5) var(--sp-5);
  overflow-x: auto;
  font: 400 var(--fs-sm)/1.7 var(--mono);
  tab-size: 4;
}
.term pre:focus-visible { outline-offset: -2px; }
.term code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }

.term .cmd { color: var(--term-cmd); }
.term .c { color: var(--term-c); }
.term .ok { color: var(--term-ok); }
.term .warn { color: var(--term-warn); }
.term .bad { color: var(--term-bad); }

/* ---------- tables (shared: platform / compare / models) ---------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-raise);
}
.table-wrap:focus-visible { outline-offset: -2px; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: var(--fs-sm);
}
thead th {
  text-align: left;
  font: 600 var(--fs-xs)/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: var(--sp-3) var(--sp-4);
  vertical-align: bottom;
}

tbody th, tbody td {
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
tbody th { font-weight: 400; color: var(--fg); }

.tag {
  display: inline-block;
  font: 600 var(--fs-xs)/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.32em 0.5em;
  border: 1px solid color-mix(in srgb, currentColor 45%, transparent);
  border-radius: var(--r-sm);
  margin-right: var(--sp-2);
  white-space: nowrap;
}
.tag-ok { color: var(--ok); }
.tag-tight { color: var(--warn); }

.num { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.row-anchor { background: var(--row-tint); }
.m-name { display: block; font-weight: 600; }
.m-repo {
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  color: var(--muted);
  margin-top: var(--sp-1);
  word-break: break-word;
}

/* comparison matrix: rows = capabilities, columns = tools, cells = ✓ ✗ ~ ? */
.table-cmp { table-layout: fixed; }
.table-cmp thead th:first-child { width: 32%; }
.table-cmp thead th:not(:first-child),
.table-cmp td { text-align: center; }
.table-cmp th[scope="row"] { font-weight: 600; }
/* stone-llama is a column: tint ours */
.table-cmp .self { background: var(--row-tint); }

/* tinted surfaces carry a neutral chip: accent-on-accent over the darker tint
   drops below 4.5:1 in the light theme (measured — see STYLEGUIDE) */
.row-anchor code { background: var(--panel); }

/* ---------- platform (03) ---------- */

.table-plat tbody th { font-weight: 600; }
.table-plat thead th:not(:first-child),
.table-plat td { text-align: center; }
.table-plat td { white-space: nowrap; }

/* ---------- footer ---------- */

.site-foot {
  background: var(--bg-raise);
  padding-block: clamp(2rem, 5vw, 3rem);
  font-size: var(--fs-sm);
}
.foot-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}
.foot-brand { display: flex; gap: var(--sp-3); align-items: flex-start; }
.foot-brand img { border-radius: var(--r-sm); }
.foot-brand p { margin: 0; line-height: 1.5; }
.site-foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--sp-2); }
.site-foot nav a { color: var(--fg-2); text-decoration: none; }
.site-foot nav a:hover { color: var(--accent); text-decoration: underline; }
.foot-legal p { margin: 0 0 var(--sp-3); color: var(--muted); max-width: 62ch; }
.foot-legal strong { color: var(--fg-2); }

/* ---------- responsive ---------- */

@media (max-width: 980px) {
  .features { grid-template-columns: minmax(0, 1fr); }
  .term-grid { grid-template-columns: minmax(0, 1fr); }
  .foot-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .foot-legal { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .head-row { flex-wrap: wrap; gap: var(--sp-3); padding-block: var(--sp-2); }
  .site-head nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    overflow-x: auto;
    scrollbar-width: none;
    border-top: 1px solid var(--line);
  }
  .site-head nav::-webkit-scrollbar { display: none; }
  .site-head nav ul { gap: var(--sp-4); padding-block: var(--sp-2); }
  .site-head nav a { white-space: nowrap; }
  .sect { scroll-margin-top: 124px; }
}

@media (max-width: 560px) {
  .install { flex-direction: column; }
  .copy { border-left: 0; border-top: 1px solid var(--line-strong); padding: var(--sp-3); }
  .hero-links .btn { flex: 1; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .site-head nav ul { gap: var(--sp-2); }   /* five links fit 375px, no strip scroll */

  /* every table fits 375px without horizontal scroll: smaller type,
     6px cell padding, headers allowed to break anywhere */
  table { font-size: var(--fs-xs); }
  thead th, tbody th, tbody td { padding: var(--sp-2) 6px; }
  .table-cmp thead th { font-size: 0.625rem; padding-inline: 4px; overflow-wrap: anywhere; }
  .table-cmp thead th:first-child { width: 26%; }
  .table-models .tag { white-space: normal; margin-right: 0; }
  .table-models .num .est { display: block; }

  /* sticky first column so row identity survives the rare overflow */
  .table-wrap th:first-child,
  .table-wrap td:first-child {
    position: sticky;
    left: 0;
    z-index: 1;
    background: var(--bg-raise);
    border-right: 1px solid var(--line);
  }
  .table-wrap thead th:first-child { background: var(--panel); }
  .table-wrap .row-anchor th:first-child,
  .table-wrap .row-anchor td:first-child { background: var(--row-tint); }
}