/* ============================================================
 * SCRATCH PROTO — Canonical Design Language
 *
 * Reconciled from PazerOP/scratch (common/style.css, nav.css,
 * shell.css) and wow-look-at-my/simple-llm-ui (theme.css).
 * Where the two drifted, this file adopts scratch's richer
 * variant (scanline, registration corner-marks, badge-proto)
 * and adds the formal spacing + radius scale neither repo had.
 *
 * Aesthetic: exposed wireframe, dot-grid substrate, monospace
 * typography, amber caution accents, registration marks,
 * build-stamp metadata. An internal dev tool that was never
 * meant to ship — and looks proud of it.
 * ============================================================ */

/* Design tokens (the :root block) moved to scratch-tokens.css — link it before this file. */

/* ===================================================================
   Reset & base
   =================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  color-scheme: dark;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  font-size: var(--fs-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  background-image:
    var(--scanline),
    radial-gradient(circle, var(--grid-dot) 1px, transparent 1px);
  background-size: auto, var(--grid-size) var(--grid-size);
  background-position: 0 0, 0 0;
  background-attachment: fixed, fixed;
}

/* Scanline kill-switch handled via --scanline-alpha (0 = off) */

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

a { color: var(--accent); text-decoration: none; transition: color var(--dur) var(--ease-out); }
a:hover { color: var(--accent-hover); }

code, pre { font-family: var(--font-mono); font-size: 0.9em; }
code {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 0.15em 0.4em;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--text-bright);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

/* Form controls don't inherit font or color from the document by default
   (they use the UA font). Make them inherit so the mono stack applies
   everywhere; override font-family only where a control needs the display
   face (rare). This is why no control class repeats --font-mono. */
button, input, select, textarea { font: inherit; color: inherit; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--r-sm); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===================================================================
   Style-guide shell + sticky nav
   =================================================================== */

.sg {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  min-height: 100vh;
}

.sg-rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  padding: var(--sp-6) 0 var(--sp-5);   /* no horizontal padding — nav bleeds to both edges */
  border-right: 1px solid #333844;   /* rail ↔ content line stays full-strength (NOT --border-dashed) */
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
/* Re-inset everything EXCEPT the nav, which spans the full rail width. */
.sg-rail-brand, .sg-rail-sub, .sg-rail-foot { padding-left: var(--sp-5); padding-right: var(--sp-4); }

.sg-rail-brand {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.sg-rail-brand::before { content: '>'; color: var(--accent); font-weight: 400; }

/* ── DECORATIVE FLAVOR LABELS ─────────────────────────────────────
   The tiny all-caps mono "// …" tags (.sg-rail-sub, .plate-label, and the
   "// " / build-stamp metadata) are DECORATION, not information. They set
   the "exposed instrument" tone — and they are deliberately hard to read.
   Design rule: assume NOBODY ever reads them and nobody should ever HAVE to.
   - Never put information a user actually needs into this style.
   - Real section labels (Surfaces, Text, Semantic colors…) use readable type.
   - Good use of the flavor style: self-evident metadata like a "6 items"
     count sitting to the right of a real, readable heading.
   ────────────────────────────────────────────────────── */
.sg-rail-sub {
  font-size: 8px;          /* sub-micro: intentionally barely legible */
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: var(--sp-1);
  padding-left: calc(var(--sp-5) + 22px);
}
.sg-rail-sub::before { content: '// '; color: var(--text-disabled); }

/* Rail nav is now <scratch-nav flush> (scratch-nav.js) — no .sg-nav rules. */

.sg-rail-foot {
  margin-top: auto;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border-dashed);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-disabled);
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

/* --- Main column --- */
.sg-main { padding: var(--sp-7) var(--sp-7) var(--sp-8); min-width: 0; max-width: 1080px; }

.sg-masthead { margin-bottom: var(--sp-7); display: flex; flex-direction: column; }
.sg-masthead-row { display: flex; align-items: center; gap: var(--sp-3); flex-wrap: wrap; }
.sg-masthead h1 { font-size: clamp(1.9rem, 4.5vw, 2.4rem); font-weight: 700; letter-spacing: -0.03em; }
.sg-masthead h1::before { content: '> '; color: var(--accent); font-weight: 400; }
.sg-masthead-tag {
  margin-top: var(--sp-3);
  color: var(--text-muted);
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.sg-masthead-tag::before { content: '// '; color: var(--text-disabled); }
.sg-lede {
  font-family: var(--font-body);
  margin-top: var(--sp-4);
  max-width: 62ch;
  color: var(--text);
  line-height: 1.7;
  text-wrap: pretty;
}
.sg-lede strong { color: var(--text-bright); font-weight: 600; }

/* --- Section scaffolding --- */
.sg-section { padding-top: var(--sp-7); scroll-margin-top: var(--sp-4); }
.sg-section-head {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--border-dashed);
}
.sg-section-num {
  font-size: var(--fs-small);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.sg-section h2 { font-size: var(--fs-h2); font-weight: 700; }
.sg-section-note { color: var(--text-muted); font-size: var(--fs-small); margin-left: auto; }

/* Real, readable subsection labels (Surfaces, Text, Semantic colors…).
   These carry information, so they get legible display type — NOT the small
   all-caps flavor style. */
.sg-subhead {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--text-bright);
  margin: var(--sp-6) 0 var(--sp-4);
}
.sg-subhead:first-child { margin-top: 0; }
.sg-subhead::before { content: '— '; color: var(--accent); font-weight: 400; }

.sg-prose { color: var(--text); font-family: var(--font-body); max-width: 64ch; line-height: 1.7; margin-bottom: var(--sp-4); text-wrap: pretty; }
.sg-prose code { color: var(--accent-hover); }

/* ===================================================================
   Color tokens
   =================================================================== */
/* ===================================================================
   Preview + caption → sealed web component: <scratch-preview>
   (scratch-preview.js). Body is a slot — put any HTML in it; .fill makes a
   block stretch edge-to-edge (used for color swatches). .preview-grid is the
   layout container; .preview-sub doubles as a small caption utility.
   =================================================================== */
.preview-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: var(--sp-3); }
.fill { flex: 1; align-self: stretch; }
.preview-sub { font-size: var(--fs-micro); color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* ===================================================================
   Generic demo plate (live component showcase)
   =================================================================== */
.plate {
  border: 1px solid var(--border-dashed);
  border-radius: var(--r-md);
  background:
    var(--scanline),
    radial-gradient(circle, var(--grid-dot) 1px, transparent 1px),
    var(--bg-deep);
  background-size: auto, var(--grid-size) var(--grid-size), auto;
  background-attachment: fixed, fixed, fixed;
  padding: var(--sp-5);
  position: relative;
  margin-bottom: var(--sp-4);
}
.plate-label {
  position: absolute;
  top: var(--sp-2); right: var(--sp-3);
  font-size: var(--fs-micro);
  color: var(--text-disabled);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.plate-row { display: flex; flex-wrap: wrap; gap: var(--sp-3); align-items: center; }
.plate-col { display: flex; flex-direction: column; gap: var(--sp-3); }
.plate-stack { display: flex; flex-direction: column; gap: var(--gap-stack); max-width: 420px; }

/* ===================================================================
   Component library
   =================================================================== */

/* Buttons → now a sealed web component: <scratch-button> (scratch-button.js).
   Variants: default · variant="accent" · variant="danger" · variant="link".
   No .btn CSS class exists on purpose — the component is the only way to
   make a button, so it can't be assembled wrong. */

/* Inputs → sealed web component: <scratch-field> (scratch-field.js).
   Variants: default · dashed · multiline. */

/* Tabs → sealed web component: <scratch-tabs> + <scratch-tab> (scratch-tabs.js).
   Connected-underline strip generated inside the component. */

/* Badges → <scratch-badge>; Cards → <scratch-card> (corner-marks sealed inside). */

/* Status indicator → sealed web component: <scratch-led> (scratch-led.js).
   States: good / accent / bad. `live` = pulse (running/queued only). */
.dot-legend { font-size: var(--fs-small); }
.dot-legend span { display: inline-flex; align-items: center; gap: 6px; }
.dot-legend .hint { color: var(--text-disabled); }

/* Caution stripe */
.caution-stripe {
  border-top: 3px solid transparent;
  border-image: repeating-linear-gradient(45deg, var(--accent) 0 6px, transparent 6px 12px) 3;
}

/* Registration marks utility */
.reg-marks { position: relative; }
.reg-marks::before, .reg-marks::after {
  content: ''; position: absolute; width: 12px; height: 12px;
  border-color: var(--border-dashed); border-style: solid; pointer-events: none; opacity: 0.6;
}
.reg-marks::before { top: -1px; left: -1px; border-width: 1px 0 0 1px; }
.reg-marks::after { bottom: -1px; right: -1px; border-width: 0 1px 1px 0; }

/* "FAILED" / error text — readable bright-red glyphs with a red drop-shadow
   behind them, where the shadow is dithered by a 2×2px checkerboard mask
   (reads as a CRT/print artifact). The text itself is never masked, so it
   stays fully legible. Requires data-text matching the visible text. */
.text-cut-shadow {
  position: relative;
  display: inline-block;
  isolation: isolate;            /* keep ::before's z-index local */
  color: var(--danger);
}
.text-cut-shadow::before {
  content: attr(data-text);
  position: absolute;
  /* pad the box out so the blurred halo isn't clipped by mask-clip:border-box,
     then offset back by the same amount to stay centered behind the text */
  left: -0.5em; top: -0.5em;
  padding: 0.5em;
  white-space: nowrap;
  z-index: -1;
  color: var(--danger);
  pointer-events: none;
  /* soft red glow halo */
  filter: blur(4px) drop-shadow(0 0 3px var(--danger));
  /* 2×2px checkerboard cut out of the glow (mask applies after the blur,
     so the holes stay crisp) */
  -webkit-mask-image: conic-gradient(#000 90deg, #0000 0 180deg, #000 0 270deg, #0000 0);
          mask-image: conic-gradient(#000 90deg, #0000 0 180deg, #000 0 270deg, #0000 0);
  -webkit-mask-size: 4px 4px;
          mask-size: 4px 4px;
}

/* Build-stamp footer */
.build-stamp {
  font-size: var(--fs-micro); letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-disabled); display: flex; flex-direction: column; gap: var(--sp-1);
}
.build-stamp .row { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }
.build-stamp .sep { opacity: 0.6; }
.build-stamp b { color: var(--text-muted); font-weight: 400; font-variant-numeric: tabular-nums; }

/* Sidebar nav (both the demo and this page's rail) → sealed web component:
   <scratch-nav> + <scratch-nav-item> (scratch-nav.js). No .mininav rules. */

/* ===================================================================
   Chat message + composer demo
   =================================================================== */
/* Chat row → <scratch-message>; composer → <scratch-composer>. */

/* ===================================================================
   Modal demo
   =================================================================== */
/* Modal surface → <scratch-modal>. */
scratch-modal scratch-tabs::part(strip) { margin-top: -4px; }
scratch-modal scratch-tabs::part(panels) { padding-top: var(--sp-2); }
.modal-x { background: none; border: none; color: var(--text-muted); font-size: 20px; line-height: 1; cursor: pointer; margin: 0 var(--sp-3); padding: 0; display: flex; align-items: center; justify-content: center; width: 20px; height: 20px; transform: translateY(-8px); }
.modal-x:hover { color: var(--text-bright); }
.modal-pane { padding: 0 var(--sp-4) var(--sp-4); }
.upstream-item { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; padding: var(--pad-card); background: var(--bg-deep); border: 1px solid var(--border); border-radius: var(--r-md); }
.upstream-name { font-weight: 600; color: var(--text-bright); margin-right: 6px; }
.upstream-url { font-size: 11px; color: var(--text-muted); margin-top: 3px; word-break: break-all; }

/* ===================================================================
   Spec tables (tokens / scales / reconciliation)
   =================================================================== */
.spec { width: 100%; border-collapse: collapse; font-size: var(--fs-small); }
.spec th {
  text-align: left; font-weight: 400; color: var(--text-muted);
  font-size: var(--fs-tiny); text-transform: uppercase; letter-spacing: 0.1em;
  padding: var(--sp-2) var(--sp-3); border-bottom: 1px solid var(--border-dashed);
}
.spec td { padding: var(--sp-2) var(--sp-3); border-bottom: 1px solid var(--border-light); vertical-align: middle; }
.spec tr:hover td { background: var(--bg-surface); }
.spec .mono { color: var(--text-bright); }
.spec .muted { color: var(--text-muted); }
.spec .accent { color: var(--accent); }
.bar { display: inline-block; height: 12px; background: var(--accent); border-radius: 1px; vertical-align: middle; }

/* Reconciliation table verdict pills */
.verdict { font-size: var(--fs-micro); text-transform: uppercase; letter-spacing: 0.08em; padding: 2px 7px; border-radius: var(--r-sm); white-space: nowrap; }
.verdict.kept { color: var(--signal); border: 1px solid var(--signal-dim); background: var(--signal-glow); }
.verdict.fixed { color: var(--accent); border: 1px solid var(--accent-dim); background: var(--accent-glow); }
.verdict.added { color: var(--text-bright); border: 1px solid var(--border); background: var(--bg-elevated); }

/* Spacing scale visual */
.scale-row { display: flex; align-items: center; gap: var(--sp-3); padding: var(--sp-1) 0; }
.scale-token { width: 64px; font-size: var(--fs-tiny); color: var(--text-bright); }
.scale-px { width: 48px; font-size: var(--fs-tiny); color: var(--text-muted); text-align: right; }
.scale-bar { height: 14px; background: var(--accent-glow); border: 1px solid var(--accent-dim); border-radius: var(--r-sm); }

/* Type specimens */
.type-spec { padding: var(--sp-3) 0; border-bottom: 1px solid var(--border-light); }
.type-spec .label { font-size: var(--fs-micro); color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: var(--sp-2); }
.type-spec .sample { color: var(--text-bright); line-height: 1.2; }

/* Motion previewes */
.motion-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: var(--sp-3); }
.motion-cell { border: 1px solid var(--border); border-radius: var(--r-md); padding: var(--sp-4); background: var(--bg-surface); cursor: pointer; }
.motion-cell .name { font-size: var(--fs-small); color: var(--text-bright); margin-bottom: 4px; }
.motion-cell .curve { font-size: var(--fs-tiny); color: var(--text-muted); }
.motion-track { height: 8px; background: var(--bg-deep); border-radius: var(--r-pill); margin-top: var(--sp-3); position: relative; overflow: hidden; }
.motion-dot { position: absolute; top: 50%; left: 0; width: 14px; height: 14px; margin-top: -7px; border-radius: 50%; background: var(--accent); }

/* Menu button — fixed top-left, only shown in drawer mode (≤900px).
   Base rule comes BEFORE the media query so the query's override wins. */
.sg-railtoggle {
  display: none;
  position: fixed; top: var(--sp-3); left: var(--sp-3); z-index: 65;
  align-items: center; gap: 7px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-bright);
  font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.1em;
  padding: 8px 12px; cursor: pointer;
}
.sg-railtoggle:hover { border-color: var(--accent-dim); }
.sg-railtoggle .bars { display: inline-flex; flex-direction: column; gap: 2px; }
.sg-railtoggle .bars i { width: 14px; height: 1.5px; background: var(--accent); display: block; }

.sg-railscrim {
  position: fixed; inset: 0; z-index: 55;
  background: rgba(0,0,0,0.55);
  opacity: 0; pointer-events: none;
  transition: opacity var(--dur-slow) var(--ease-out);
  display: none;
}

@media (max-width: 900px) {
  .sg { grid-template-columns: 1fr; }
  .sg-main { padding: var(--sp-5) var(--sp-4) var(--sp-7); padding-top: calc(var(--sp-5) + 44px); }

  /* Rail becomes an off-canvas drawer summoned by the menu button. */
  .sg-rail {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: min(280px, 84vw);
    height: 100vh;
    z-index: 60;
    background: var(--bg-deep);
    border-right: 1px solid #333844;   /* drawer edge stays full-strength */
    transform: translateX(-100%);
    transition: transform var(--dur-slow) var(--ease-out);
    will-change: transform;
  }
  html.rail-open .sg-rail { transform: translateX(0); box-shadow: var(--shadow-modal); }

  .sg-railtoggle { display: inline-flex; }
  .sg-railscrim { display: block; }
  html.rail-open .sg-railscrim { opacity: 1; pointer-events: auto; }
}