/* ==========================================================================
   Songcards — production stylesheet (single file, no @import).
   Loaded by every public page as: <link rel="stylesheet" href="/styles.css">
   Source of truth for tokens/components is this file. The modular files
   under public/assets/css/ are reference-only and are not requested by any
   page — see the banner comment at the top of each of those files.
   ========================================================================== */

/* ==========================================================================
   1. Fonts
   Self-hosted static WOFF2 only. No variable fonts, no TTF, no font CDN.
   font-display:optional avoids layout shift from a late-swapping web font —
   acceptable here because Inter/IBM Plex Mono are close in metrics to the
   system-font fallback stack below, so a fallback-only first paint is fine.
   ========================================================================== */
@font-face{font-family:"Inter";font-style:normal;font-weight:400;font-display:optional;src:url("/assets/fonts/inter-v20-latin-regular.woff2") format("woff2")}
@font-face{font-family:"Inter";font-style:normal;font-weight:500;font-display:optional;src:url("/assets/fonts/inter-v20-latin-500.woff2") format("woff2")}
@font-face{font-family:"Inter";font-style:normal;font-weight:600;font-display:optional;src:url("/assets/fonts/inter-v20-latin-600.woff2") format("woff2")}

@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:optional;src:url("/assets/fonts/ibm-plex-mono-v20-latin-regular.woff2") format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:optional;src:url("/assets/fonts/ibm-plex-mono-v20-latin-500.woff2") format("woff2")}

/* ==========================================================================
   2. Colour tokens
   Locked base palette per master brand — do not alter these hex values.
   ========================================================================== */
:root{
  --sc-bg:#1B1712;
  --sc-surface:#252019;
  --sc-border:#3A332A;
  --sc-text:#EDE6D6;
  --sc-text-secondary:#9C9384;
  --sc-copper:#A8683B;
  --sc-saved:#5F7A5E;

  --sc-bg-sunken:#151109;
  --sc-surface-raised:#2C261E;
  --sc-border-strong:#4A4235;
  --sc-text-faint:#847A69;

  --sc-copper-hover:#B87545;
  --sc-copper-press:#95592F;
  --sc-copper-wash:rgba(168,104,59,0.12);

  --sc-status-idea:#8A8072;
  --sc-status-in-progress:#B8923F;
  --sc-status-ready:#6B84A0;
  --sc-status-released:#5F7A5E;
  --sc-status-archived:#6E6656;
  --sc-status-final:#5F7A5E;
  --sc-status-progress:#B8923F;
  --sc-status-review:#6B84A0;
  --sc-status-draft:#8A8072;

  --surface-app:var(--sc-bg);
  --surface-card:var(--sc-surface);
  --surface-raised:var(--sc-surface-raised);
  --surface-sunken:var(--sc-bg-sunken);
  --border-hairline:var(--sc-border);
  --border-strong:var(--sc-border-strong);
  --text-primary:var(--sc-text);
  --text-secondary:var(--sc-text-secondary);
  --text-faint:var(--sc-text-faint);
  --accent:var(--sc-copper);
  --accent-hover:var(--sc-copper-hover);
  --accent-press:var(--sc-copper-press);
  --accent-wash:var(--sc-copper-wash);
  --accent-ink:#000000; /* pure black — the only text color reaching 4.5:1 AA against the locked copper accent */
  --focus-ring:var(--sc-copper);
}

/* ==========================================================================
   3. Spacing tokens
   ========================================================================== */
:root{
  --sp-1:4px;
  --sp-2:8px;
  --sp-3:12px;
  --sp-4:16px;
  --sp-5:20px;
  --sp-6:24px;
  --sp-8:32px;
  --sp-10:40px;
  --sp-12:48px;
  --sp-16:64px;

  --radius-sm:2px;
  --radius-md:4px;
  --radius-lg:4px;
  --radius-tile:48px;

  --border-w:1px;
  --border:var(--border-w) solid var(--border-hairline);

  --shadow-none:none;
  --shadow-panel:none;
  --shadow-raised:none;
  --shadow-modal:none;

  --tab-size:20px;

  --ease-standard:cubic-bezier(0.2,0,0,1);
  --dur-fast:120ms;
  --dur-base:180ms;
}

/* ==========================================================================
   4. Typography
   ========================================================================== */
:root{
  --font-ui:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,monospace;

  --fw-regular:400;
  --fw-medium:500;
  --fw-semibold:600;

  --fs-display:34px;
  --fs-title:22px;
  --fs-heading:17px;
  --fs-body:14px;
  --fs-small:13px;
  --fs-meta:12px;
  --fs-label:11px;

  --lh-tight:1.15;
  --lh-snug:1.35;
  --lh-body:1.55;

  --tracking-meta:0.06em;
  --tracking-label:0.09em;
}

/* ==========================================================================
   5. Focus and accessibility
   Keyboard-focus rings and motion-reduction. :where() keeps specificity at 0
   so it never fights component borders. outline (not border) layers cleanly
   over inline-styled controls. :focus-visible means mouse clicks don't
   trigger it — only keyboard/assistive-tech focus does.
   ========================================================================== */
:where(button,[role="button"],a[href],input,select,textarea,summary,[tabindex]):focus-visible{
  outline:2px solid var(--focus-ring);
  outline-offset:2px;
  border-radius:var(--radius-sm);
}
:where(button,a[href],input,select,textarea,summary,[tabindex]):focus:not(:focus-visible){outline:none}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important}
}

/* ==========================================================================
   6. Global elements
   ========================================================================== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--surface-app);
  color:var(--text-primary);
  font:var(--fw-regular) var(--fs-body)/var(--lh-body) var(--font-ui);
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--font-ui);font-weight:var(--fw-semibold);line-height:var(--lh-tight);margin:0}
p{margin:0}

.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;
}

/* Progressive-enhancement gate — hides [data-copy-target] etc. until
   site.js confirms JS actually ran (removes .no-js from <html>). */
.no-js .js-only{display:none}

/* ==========================================================================
   7. Layout
   ========================================================================== */
.wrap{max-width:1120px;margin-inline:auto;padding-inline:var(--sp-6)}
.section{padding-block:var(--sp-16)}

.skip-link{
  position:absolute;left:var(--sp-4);top:-48px;z-index:100;
  background:var(--sc-copper);color:var(--sc-bg);
  padding:var(--sp-2) var(--sp-4);border-radius:var(--radius-sm);
  font:var(--fw-medium) var(--fs-small)/1 var(--font-ui);
  text-decoration:none;transition:top var(--dur-base) var(--ease-standard);
}
.skip-link:focus{top:var(--sp-4)}

.site-header{border-bottom:var(--border)}
.site-header__inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:var(--sp-6);padding-block:var(--sp-4);flex-wrap:wrap;
}
.brand{display:inline-flex;align-items:center;text-decoration:none}
.brand__wordmark{height:28px;width:auto}
.site-nav{display:flex;flex-wrap:wrap;gap:var(--sp-6);list-style:none;margin:0;padding:0}
.site-nav a{
  font:var(--fw-medium) var(--fs-small)/1 var(--font-ui);
  text-decoration:none;color:var(--text-secondary);
  display:inline-block;padding-block:var(--sp-2);border-bottom:2px solid transparent;
}
.site-nav a:hover{color:var(--text-primary)}
.site-nav a[aria-current="page"]{color:var(--text-primary);border-bottom-color:var(--sc-copper)}

.site-footer{border-top:var(--border);margin-top:var(--sp-16)}
.site-footer__inner{
  display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--sp-10);
  padding-block:var(--sp-10);
}
.site-footer__tagline{
  margin-top:var(--sp-3);color:var(--text-secondary);font-size:var(--fs-small);
}
.site-footer nav{display:flex;flex-direction:column;gap:var(--sp-2)}
.site-footer a{text-decoration:none;color:var(--text-secondary);font-size:var(--fs-small);display:inline-block;padding-block:var(--sp-1)}
.site-footer a:hover{color:var(--text-primary)}
.site-footer__col p{margin-bottom:var(--sp-2);font-size:var(--fs-small)}
.site-footer__attribution{
  margin-top:var(--sp-4);color:var(--text-secondary);font-size:var(--fs-label);
  font-family:var(--font-mono);text-transform:uppercase;letter-spacing:var(--tracking-label);
  line-height:var(--lh-snug);
}

.hero{
  display:grid;grid-template-columns:1.1fr 0.9fr;gap:var(--sp-10);
  align-items:center;padding-block:var(--sp-16);
}
.hero__eyebrow{
  font:var(--fw-medium) var(--fs-label)/1 var(--font-mono);
  text-transform:uppercase;letter-spacing:var(--tracking-label);
  color:var(--text-secondary);margin-bottom:var(--sp-4);display:block;
}
.hero h1{font-size:var(--fs-display);line-height:1.08;letter-spacing:-0.01em}
.hero__sub{margin-top:var(--sp-5);color:var(--text-secondary);font-size:17px;line-height:var(--lh-body);max-width:52ch}
.hero__actions{margin-top:var(--sp-8);display:flex;align-items:center;gap:var(--sp-5);flex-wrap:wrap}
.hero__meta{color:var(--text-secondary);font:var(--fw-regular) var(--fs-small)/1.4 var(--font-ui)}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--sp-5)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:var(--sp-5)}

/* App-screenshot figure — fixed aspect-ratio guards against the source
   image's real proportions ever being overridden by a wrong width/height
   attribute (the structural cause of the CLS this pass corrects). */
.app-screenshot-figure{
  margin:var(--sp-8) 0 0;border:var(--border);border-radius:var(--radius-md);
  overflow:hidden;background:var(--surface-card);
}
.app-screenshot-figure img{aspect-ratio:2209/1204;width:100%;height:auto}
.app-screenshot-figure figcaption{
  padding:var(--sp-3) var(--sp-5);font:var(--fw-regular) var(--fs-label)/1 var(--font-mono);
  text-transform:uppercase;letter-spacing:var(--tracking-label);color:var(--text-secondary);
  border-top:var(--border);
}

/* ==========================================================================
   8. Components
   ========================================================================== */
.btn{
  display:inline-flex;align-items:center;gap:var(--sp-2);
  padding:var(--sp-3) var(--sp-5);border-radius:var(--radius-md);
  font:var(--fw-medium) var(--fs-body)/1 var(--font-ui);
  text-decoration:none;border:1px solid transparent;cursor:pointer;
  transition:background var(--dur-base) var(--ease-standard),border-color var(--dur-base) var(--ease-standard);
}
.btn--primary{background:var(--accent);color:var(--accent-ink)}
.btn--primary:hover{background:var(--accent-hover)}
.btn--primary:active{background:var(--accent-press)}
.btn--secondary{background:transparent;color:var(--text-primary);border-color:var(--border-hairline)}
.btn--secondary:hover{border-color:var(--border-strong)}

.card{
  background:var(--surface-card);border:var(--border);border-radius:var(--radius-md);
  padding:var(--sp-6);
}
.card h3{font-size:var(--fs-heading)}
.value-card p{margin-top:var(--sp-3);color:var(--text-secondary);font-size:var(--fs-small)}
.value-card .icon{color:var(--sc-copper)}

.meta-chip{
  display:inline-flex;align-items:center;gap:var(--sp-1);
  font:var(--fw-regular) var(--fs-meta)/1 var(--font-mono);
  text-transform:uppercase;letter-spacing:var(--tracking-meta);
  color:var(--text-secondary);border:var(--border);border-radius:var(--radius-sm);
  padding:var(--sp-1) var(--sp-2);
}
.status-dot{width:8px;height:8px;border-radius:50%;display:inline-block;background:var(--sc-status-in-progress)}

.section-eyebrow{
  font:var(--fw-medium) var(--fs-label)/1 var(--font-mono);text-transform:uppercase;
  letter-spacing:var(--tracking-label);color:var(--text-secondary);display:block;margin-bottom:var(--sp-3);
}
.section-title{font-size:28px;line-height:var(--lh-tight);max-width:36ch}
.section-lede{margin-top:var(--sp-4);color:var(--text-secondary);font-size:16px;max-width:60ch}

.callout{
  border:var(--border);border-left:3px solid var(--sc-copper);
  border-radius:var(--radius-md);padding:var(--sp-5);background:var(--surface-card);
}
.callout--warning{border-left-color:var(--sc-status-in-progress)}
.callout p + p{margin-top:var(--sp-2)}
.callout strong{color:var(--text-primary)}

.placeholder{
  border:1px dashed var(--border-strong);border-radius:var(--radius-md);
  padding:var(--sp-6);color:var(--text-secondary);background:var(--surface-sunken);
  display:flex;flex-direction:column;gap:var(--sp-1);
}
.placeholder__label{
  font:var(--fw-medium) var(--fs-label)/1 var(--font-mono);text-transform:uppercase;
  letter-spacing:var(--tracking-label);color:var(--text-secondary);
}
.placeholder__body{font-size:var(--fs-small)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;gap:var(--sp-1);align-items:center;
  font:var(--fw-regular) var(--fs-small)/1 var(--font-ui);color:var(--text-secondary);
  padding-block:var(--sp-4);
}
.breadcrumbs a{text-decoration:none;color:var(--text-secondary)}
.breadcrumbs a:hover{color:var(--text-primary)}
.breadcrumbs span[aria-hidden]{color:var(--text-faint)}

.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:var(--sp-5)}
.steps li{display:flex;gap:var(--sp-4);align-items:flex-start}
.steps__index{
  flex:0 0 auto;width:28px;height:28px;border-radius:var(--radius-sm);border:var(--border);
  display:flex;align-items:center;justify-content:center;
  font:var(--fw-medium) var(--fs-small)/1 var(--font-mono);color:var(--text-secondary);
}
.steps__body h3{font-size:var(--fs-heading);margin-bottom:var(--sp-1)}
.steps__body p{color:var(--text-secondary);font-size:var(--fs-small)}

.compare{width:100%;border-collapse:collapse;font-size:var(--fs-small)}
.compare th,.compare td{
  text-align:left;padding:var(--sp-3) var(--sp-4);border-bottom:var(--border);
  vertical-align:top;
}
.compare th{
  font:var(--fw-medium) var(--fs-label)/1 var(--font-mono);text-transform:uppercase;
  letter-spacing:var(--tracking-label);color:var(--text-secondary);
}
.compare-scroll{overflow-x:auto}

.answer{border-top:var(--border);padding-block:var(--sp-6)}
.answer h3{font-size:var(--fs-heading);margin-bottom:var(--sp-2)}
.answer p{color:var(--text-secondary);font-size:var(--fs-small);max-width:65ch}

/* ==========================================================================
   9. Responsive rules
   Grouped by breakpoint, widest first. Every rule here overrides a base
   rule declared in sections 7–8 above.
   ========================================================================== */
@media (max-width:900px){
  .hero{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr}
}

@media (max-width:768px){
  .site-footer__inner{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
}

@media (max-width:640px){
  .wrap{padding-inline:var(--sp-4)}
  .section{padding-block:var(--sp-10)}
}