/* main.css -- design tokens, reset, base typography, layout & the cassette/tape
   visual language. External stylesheet.
   THEME: "Chrome" -- retro-cassette, white/cream accent, minimal & flat.
   (Previous "Ferric" theme is kept in main.ferric.css; swap with tools/theme.sh.) */

:root {
  /* ---- warm charcoal deck ---- */
  --c-bg:#15120E; --c-bg-2:#100D0A;
  --c-surface:#1C1813; --c-surface-2:#241E17; --c-shell:#2A2219;
  --c-border:#342B20; --c-border-2:#473A2A;

  /* ---- cream / white = PRIMARY accent (brand, CTAs, highlights) ---- */
  --c-accent:#EFE7D6; --c-accent-hover:#FFFFFF; --c-accent-quiet:#2A2219;
  --c-tape:#EFE7D6; --c-tape-hi:#FFFFFF; --c-tape-lo:#C7BCA3; --c-rust:#6E5A3C;

  /* ---- muted retro teal = live / detection / success / links (rationed) ---- */
  --c-signal:#86B2A6; --c-signal-hi:#A9CDC2; --c-signal-quiet:#1B2622;
  --c-ok:#86B2A6; --c-info:#86B2A6;

  /* ---- faded brick red = REC / alert / errors / "loss" (very rationed) ---- */
  --c-danger:#CB6049; --c-danger-quiet:#2E1813;
  --c-warn:#D6B36A;            /* muted gold -- stars */

  /* ---- cream label ---- */
  --c-bone:#EFE7D6; --c-bone-dim:#C7BCA3;

  /* ---- text (warm whites/grays); faint kept readable on --c-bg ---- */
  --c-text:#F2ECE0; --c-text-muted:#A39A86; --c-text-faint:#8A806C;

  /* ---- type (UNCHANGED) ---- */
  --font-head:"Bricolage Grotesque","Space Grotesk",system-ui,sans-serif;
  --font-body:"Inter",system-ui,-apple-system,sans-serif;
  --font-mono:"Space Mono",ui-monospace,"SFMono-Regular",monospace;

  --fs-display:clamp(2.7rem, 1.7rem + 4.6vw, 5rem);
  --fs-h1:clamp(2.1rem, 1.5rem + 2.6vw, 3.1rem);
  --fs-h2:clamp(1.55rem, 1.2rem + 1.5vw, 2.25rem);
  --fs-h3:1.32rem;
  --fs-body:1.0625rem; --fs-small:0.86rem;
  --lh-tight:1.05; --lh-body:1.62; --tracking-head:-0.02em; --tracking-label:0.18em;

  --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; --sp-9:6rem;

  --radius-sm:6px; --radius:10px; --radius-lg:16px; --radius-shell:14px;

  /* minimal: subtle shadows, thin rings instead of glows */
  --shadow-1:0 1px 2px rgba(0,0,0,.4);
  --shadow-2:0 14px 34px -16px rgba(0,0,0,.62);
  --glow-tape:0 0 0 1px color-mix(in srgb, var(--c-accent) 42%, transparent);
  --glow-signal:0 0 0 1px color-mix(in srgb, var(--c-signal) 55%, transparent);
  --ring:0 0 0 3px color-mix(in srgb, var(--c-signal) 50%, transparent);

  --motion-fast:140ms; --motion:240ms; --motion-slow:500ms; --ease:cubic-bezier(.2,.7,.2,1);
  --maxw:1180px;
}

*,*::before,*::after { box-sizing:border-box; }
html { scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body {
  margin:0; color:var(--c-text);
  background:
    radial-gradient(1200px 560px at 50% -12%, rgba(255,255,255,.022), transparent 70%),
    var(--c-bg);
  font-family:var(--font-body); font-size:var(--fs-body); line-height:var(--lh-body);
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4 { font-family:var(--font-head); font-weight:800; line-height:var(--lh-tight);
  letter-spacing:var(--tracking-head); margin:0 0 var(--sp-4); text-wrap:balance; }
h1 { font-size:var(--fs-h1); } h2 { font-size:var(--fs-h2); } h3 { font-size:var(--fs-h3); font-weight:700; }
p { margin:0 0 var(--sp-4); max-width:66ch; }
a { color:var(--c-signal); text-decoration:none; transition:color var(--motion-fast) var(--ease); }
a:hover { color:var(--c-signal-hi); text-decoration:underline; text-underline-offset:3px; }
img,svg { max-width:100%; height:auto; }
ul { margin:0 0 var(--sp-4); padding-left:1.2rem; }
strong { color:var(--c-text); font-weight:600; }
::selection { background:color-mix(in srgb, var(--c-accent) 30%, transparent); color:#fff; }

/* ---------------- layout helpers ---------------- */
.container { width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:var(--sp-5); }
.section { padding-block:var(--sp-9); position:relative; }
.section--tight { padding-block:var(--sp-7); }
.center { text-align:center; }
.mono { font-family:var(--font-mono); }
.muted { color:var(--c-text-muted); }
.grid { display:grid; gap:var(--sp-5); }
.cols-2 { grid-template-columns:repeat(2,1fr); }
.cols-3 { grid-template-columns:repeat(3,1fr); }
.flow > * + * { margin-top:var(--sp-4); }

/* spacing / layout utilities */
.mt-0 { margin-top:0; } .mt-3 { margin-top:var(--sp-3); } .mt-4 { margin-top:var(--sp-4); }
.mt-5 { margin-top:var(--sp-5); } .mt-6 { margin-top:var(--sp-6); } .mt-7 { margin-top:var(--sp-7); }
.pb-0 { padding-block:0; }
.center-x { justify-content:center; }
.mx-auto { margin-inline:auto; }
.fs-sm { font-size:var(--fs-small); }
.nowrap { white-space:nowrap; }
.grid--start { align-items:start; }
.grid--gap-7 { gap:var(--sp-7); }
.list-plain { list-style:none; padding:0; }
.list-plain ul, .list-sub { list-style:none; padding-left:1.4rem; }

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

/* eyebrow kept minimal (now plain mono label, no pill) */
.eyebrow {
  display:inline-flex; align-items:center; gap:.55rem;
  font-family:var(--font-mono); font-size:var(--fs-small); font-weight:700;
  letter-spacing:var(--tracking-label); text-transform:uppercase;
  color:var(--c-text-muted); margin-bottom:var(--sp-4);
}
.eyebrow::before { content:""; width:7px; height:7px; border-radius:50%; background:var(--c-danger); }
.eyebrow--plain { color:var(--c-tape); }
.eyebrow--plain::before { display:none; }

.lead { color:var(--c-text-muted); font-size:1.18rem; line-height:1.55; max-width:62ch; }
.accent { color:var(--c-tape); }
.signal { color:var(--c-signal); }

.skip-link { position:absolute; left:-999px; top:0; background:var(--c-accent); color:var(--c-bg);
  padding:var(--sp-2) var(--sp-4); border-radius:var(--radius-sm); z-index:200; font-weight:600; }
.skip-link:focus { left:var(--sp-3); top:var(--sp-3); }
:focus-visible { outline:none; box-shadow:var(--ring); border-radius:var(--radius-sm); }

/* ---------------- cassette / tape primitives (flatter, sepia tape) ---------------- */

/* magnetic-tape strip divider -- real tape is brown/sepia */
.tape-strip { height:26px; position:relative; overflow:hidden; border-block:1px solid var(--c-border);
  background:linear-gradient(180deg, #4a3a26, #6E5A3C 50%, #4a3a26); }
.tape-strip::before { content:""; position:absolute; inset:0;
  background:repeating-linear-gradient(90deg,
    rgba(0,0,0,.30) 0 2px, transparent 2px 9px, rgba(255,255,255,.05) 9px 10px, transparent 10px 18px);
  animation:tape-scroll 2.6s linear infinite; }
@keyframes tape-scroll { to { background-position:180px 0; } }

/* reel: cream rings (chrome look) */
.reel { --reel:74px; width:var(--reel); height:var(--reel); flex:0 0 auto; position:relative;
  border-radius:50%; background:var(--c-shell);
  border:2px solid var(--c-border-2); box-shadow:inset 0 0 0 6px var(--c-bg-2);
  animation:reel-spin 7s linear infinite; }
.reel::before { content:""; position:absolute; inset:0; border-radius:50%;
  background:repeating-conic-gradient(from 0deg, transparent 0 26deg, color-mix(in srgb, var(--c-bone) 35%, transparent) 26deg 30deg); }
.reel::after { content:""; position:absolute; inset:38%; border-radius:50%;
  background:var(--c-bone); box-shadow:0 0 0 4px var(--c-bg-2), 0 0 0 6px var(--c-border-2); }
.reel--signal::after { background:var(--c-signal); }
.reel--sm { --reel:46px; }
.reel--lg { --reel:108px; }
@keyframes reel-spin { to { transform:rotate(360deg); } }

.timecode { font-family:var(--font-mono); font-weight:700; letter-spacing:.04em; color:var(--c-text-muted); }
.timecode .sep { opacity:.45; }

/* REC indicator */
.rec { display:inline-flex; align-items:center; gap:.45rem; font-family:var(--font-mono);
  font-size:var(--fs-small); font-weight:700; letter-spacing:.16em; color:var(--c-danger); text-transform:uppercase; }
.rec::before { content:""; width:8px; height:8px; border-radius:50%; background:var(--c-danger);
  animation:rec-blink 1.5s steps(1,end) infinite; }
@keyframes rec-blink { 0%,55%{ opacity:1; } 56%,100%{ opacity:.2; } }
.live {}

/* VU meter */
.vu { display:flex; align-items:flex-end; gap:3px; height:30px; }
.vu i { display:block; width:5px; height:30%; border-radius:1px; background:var(--c-border-2); transform-origin:bottom; }
.vu i.lit { background:var(--c-bone); }
.vu i.hot { background:var(--c-danger); }

/* scan-line kept very subtle */
.scanline { position:relative; overflow:hidden; }
.scanline::after { content:""; position:absolute; left:0; right:0; top:0; height:34%;
  background:linear-gradient(180deg, color-mix(in srgb,var(--c-bone) 12%, transparent), transparent);
  mix-blend-mode:screen; animation:scan 4s var(--ease) infinite; pointer-events:none; }
@keyframes scan { 0%{ transform:translateY(-120%);} 100%{ transform:translateY(320%);} }

/* label tab (track codes, tags) -- flat cream sticker */
.label-tab { font-family:var(--font-mono); font-weight:700; font-size:.95rem; color:var(--c-bg);
  background:var(--c-bone); padding:.12rem .5rem; border-radius:4px; align-self:flex-start; }

/* ---------------- scroll-reveal ---------------- */
@media (scripting: enabled) {
  .reveal { opacity:0; transform:translateY(18px); transition:opacity var(--motion-slow) var(--ease), transform var(--motion-slow) var(--ease); will-change:opacity,transform; }
  .reveal--left { transform:translateX(-22px); }
  .reveal--right { transform:translateX(22px); }
  .reveal--scale { transform:scale(.96); }
  .reveal.is-visible { opacity:1; transform:none; }
  [data-reveal-stagger] > * { transition-delay:calc(var(--i,0) * 65ms); }
}

/* ---------------- state / helper classes ---------------- */
.error { color:var(--c-danger); }
.is-hidden { display:none !important; }
.skeleton { background:linear-gradient(100deg, var(--c-surface) 30%, var(--c-surface-2) 50%, var(--c-surface) 70%);
  background-size:200% 100%; animation:shimmer 1.3s linear infinite; border-radius:var(--radius); color:transparent; min-height:1em; }
@keyframes shimmer { to { background-position:-200% 0; } }

@media (prefers-reduced-motion: reduce) {
  .reel, .tape-strip::before, .rec::before, .scanline::after, .skeleton { animation:none !important; }
  .reel::before { display:none; }
  .reveal { opacity:1 !important; transform:none !important; }
}