/* =============================================================================
   MetaHarness ExplainerSite — FOUNDRY / MINT
   Aesthetic lock [Constraint K]: deep WARM-charcoal (never blue-black), molten
   amber/copper accents, industrial-refined display type (Big Shoulders Display)
   over IBM Plex Sans/Mono, generous space, tactile pressed-metal depth.
   ZERO CYAN — deliberately NOT the cognitum cool-cyan/phosphor reference.
   P2 SHELL: tokens + structure + motion only; section copy is placeholder.
   ========================================================================== */

/* ---- Self-hosted fonts (zero CDN). woff2 files land in assets/fonts/ ------ */
@font-face {
  font-family: "Big Shoulders Display";
  src: url("assets/fonts/BigShouldersDisplay-SemiBold.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Big Shoulders Display";
  src: url("assets/fonts/BigShouldersDisplay-Black.woff2") format("woff2");
  font-weight: 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/IBMPlexSans-Regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/IBMPlexSans-Medium.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/fonts/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}

/* ---- :root FOUNDRY DESIGN TOKENS [P2.1] -------------------------------------
   Hues are warm (yellow/orange bias). No blue, no cyan, no green anywhere. */
:root {
  /* Warm-charcoal substrate — graphite with an iron-warm cast, not navy */
  --bg:          #16120e;   /* deepest — page floor */
  --bg-2:        #1d1812;   /* raised plane */
  --panel:       #241d15;   /* card body */
  --panel-2:     #2c2418;   /* card header / inset */
  --ridge:       #3a2f1f;   /* hairline edges, embossed seams */

  /* Molten metal accents — amber poured into copper */
  --amber:       #ff9e2c;   /* primary molten amber */
  --amber-hot:   #ffb650;   /* highlight / hover lift */
  --copper:      #c2703a;   /* secondary copper */
  --copper-deep: #8a4a26;   /* shadow side of copper */
  --ember:       #e8531f;   /* hottest stamp / danger-warm */
  --brass:       #d9a441;   /* tertiary brass for micro-labels */

  /* Ink — warm off-white, never blue-white */
  --ink:         #f3e8d8;   /* primary text on dark */
  --ink-2:       #d6c5ac;   /* secondary text */
  --muted:       #9c8b72;   /* captions, meta */
  --faint:       #6b5e49;   /* hairline labels */
  --on-amber:    #1a1206;   /* text that sits ON molten fills */

  /* Lines / fills derived from the warm accents */
  --line:        rgba(217,164,65,0.14);
  --line-strong: rgba(217,164,65,0.30);
  --fill-amber:  rgba(255,158,44,0.10);
  --fill-copper: rgba(194,112,58,0.12);

  /* Tactile depth — pressed-metal shadows + cast glow */
  --shadow:      0 22px 48px -26px rgba(0,0,0,0.82);
  --shadow-deep: 0 38px 90px -40px rgba(0,0,0,0.9);
  --emboss:      inset 0 1px 0 rgba(255,196,120,0.07),
                 inset 0 -1px 0 rgba(0,0,0,0.45);
  --glow-amber:  0 0 0 1px rgba(255,158,44,0.25),
                 0 14px 40px -16px rgba(255,158,44,0.32);

  /* Type */
  --display: "Big Shoulders Display", "Arial Narrow", system-ui, sans-serif;
  --sans:    "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Rhythm */
  --maxw:    1120px;
  --gutter:  clamp(20px, 5vw, 56px);
  --radius:  14px;
  --radius-s: 9px;
  --ease:    cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---- Reset / base --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* Cast-iron grain: layered warm radials + a faint poured-metal sheen.
     No blue/cyan in any stop. */
  background-image:
    radial-gradient(1100px 620px at 78% -8%, rgba(255,158,44,0.10), transparent 60%),
    radial-gradient(900px 700px at -10% 8%, rgba(194,112,58,0.08), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  background-attachment: fixed;
}

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

a {
  color: var(--amber);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
a:hover { color: var(--amber-hot); }
a:focus-visible,
summary:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Layout --------------------------------------------------------------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* ---- Type system ---------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: 0.005em;
  margin: 0 0 0.5em;
  text-transform: uppercase;
}
h1 { font-size: clamp(2.8rem, 8vw, 5.6rem); }
h2 { font-size: clamp(1.9rem, 4.4vw, 3rem); }
h3 { font-size: 1.5rem; font-weight: 600; letter-spacing: 0.01em; }
p  { margin: 0 0 1rem; max-width: 68ch; color: var(--ink-2); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
  font-weight: 400;
  margin: 0 0 14px;
}
.mono { font-family: var(--mono); }
.lede { font-size: 1.18rem; color: var(--ink); max-width: 64ch; }
.placeholder {
  color: var(--muted);
  font-style: italic;
  border-left: 2px solid var(--copper-deep);
  padding-left: 14px;
}

/* Lists — comfortable rhythm, warm markers */
ol, ul { margin: 0 0 1rem; padding-left: 1.4em; max-width: 68ch; color: var(--ink-2); }
li { margin: 0 0 0.55em; }
li::marker { color: var(--copper); }
li strong { color: var(--ink); }

/* Multi-line command block — a cast-metal plate of commands */
pre.code-block {
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--amber-hot);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--copper);
  border-radius: var(--radius-s);
  padding: 16px 18px;
  margin: 0 0 1rem;
  overflow-x: auto;
  box-shadow: var(--emboss);
  max-width: 68ch;
}
pre.code-block code {
  background: none; border: none; box-shadow: none; padding: 0;
  font-size: inherit; color: inherit; white-space: pre;
}

/* Small honest-note paragraphs at the foot of a section */
.footnote-note {
  margin-top: 18px;
  padding: 12px 16px;
  border: 1px dashed var(--copper-deep);
  border-radius: var(--radius-s);
  background: var(--fill-copper);
  color: var(--muted);
  max-width: 70ch;
}
.footnote-note small { color: var(--muted); line-height: 1.55; }

/* Inline command chip — looks struck into metal */
code, .cmd {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--amber-hot);
  background: var(--fill-amber);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 0.12em 0.45em;
  box-shadow: var(--emboss);
}

/* ---- Header / nav --------------------------------------------------------- */
.site-head {
  position: sticky; top: 0; z-index: 40;
  background: rgba(22,18,14,0.78);
  backdrop-filter: blur(11px);
  -webkit-backdrop-filter: blur(11px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--display); font-weight: 900; font-size: 1.25rem;
  letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink);
}
.brand .coin {
  width: 30px; height: 30px; border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--display); font-weight: 900; font-size: 13px;
  color: var(--on-amber);
  background: radial-gradient(circle at 34% 28%, var(--amber-hot), var(--copper) 78%, var(--copper-deep));
  box-shadow: var(--glow-amber), var(--emboss);
}
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em;
  color: var(--muted); padding: 7px 11px; border-radius: 7px;
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}
.nav-links a:hover { color: var(--ink); background: var(--fill-amber); }

/* ---- Hero ----------------------------------------------------------------- */
.hero { padding: clamp(64px, 12vw, 132px) 0 clamp(48px, 8vw, 88px); }
.hero h1 { color: var(--ink); }
.hero h1 .molten {
  background: linear-gradient(96deg, var(--amber-hot), var(--copper) 60%, var(--ember));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lede { margin-top: 20px; }
.hero .meta-row {
  display: flex; gap: 26px; flex-wrap: wrap; margin-top: 34px;
  font-family: var(--mono); font-size: 12px; color: var(--faint);
  letter-spacing: 0.05em;
}
.hero .meta-row b { color: var(--brass); font-weight: 400; }
.cta {
  display: inline-flex; align-items: center; gap: 10px; margin-top: 34px;
  font-family: var(--display); font-weight: 600; font-size: 1.05rem;
  letter-spacing: 0.03em; text-transform: uppercase;
  color: var(--on-amber);
  background: linear-gradient(96deg, var(--amber-hot), var(--copper));
  padding: 13px 26px; border-radius: 10px;
  box-shadow: var(--glow-amber), var(--emboss);
  transition: transform 0.16s var(--ease), filter 0.16s var(--ease);
}
.cta:hover { transform: translateY(-2px); filter: brightness(1.06); color: var(--on-amber); }

/* ---- Sections (native <details>) ----------------------------------------- */
.sections { padding: clamp(32px, 6vw, 64px) 0 clamp(64px, 10vw, 110px); }

.section {
  background:
    linear-gradient(180deg, var(--panel) 0%, var(--bg-2) 100%);
  border: 1px solid var(--ridge);
  border-radius: var(--radius);
  box-shadow: var(--shadow), var(--emboss);
  margin: 0 0 18px;
  overflow: hidden;
}
.section[open] { box-shadow: var(--shadow-deep), var(--emboss); }

/* The clickable bar — a stamped foundry plate */
.section > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: baseline; gap: 18px;
  padding: 26px clamp(20px, 4vw, 34px);
  user-select: none;
  transition: background 0.2s var(--ease);
}
.section > summary::-webkit-details-marker { display: none; }
.section > summary:hover { background: var(--fill-amber); }

.section .num {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.22em;
  color: var(--copper); flex: 0 0 auto; padding-top: 6px;
}
.section .head-text { flex: 1 1 auto; }
.section .head-text h2 {
  margin: 0; color: var(--ink);
  font-size: clamp(1.4rem, 3.2vw, 2.05rem);
}
.section .head-text .q {
  display: block; font-family: var(--mono); font-size: 12px;
  letter-spacing: 0.06em; color: var(--muted); margin-top: 6px;
  text-transform: none;
}
/* Chevron that rotates on open */
.section .chev {
  flex: 0 0 auto; width: 26px; height: 26px; align-self: center;
  border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--line-strong); color: var(--amber);
  font-size: 13px; line-height: 1;
  transition: transform 0.25s var(--ease), background 0.2s var(--ease);
}
.section[open] .chev { transform: rotate(90deg); background: var(--fill-amber); }

.section .body {
  padding: 4px clamp(20px, 4vw, 34px) 32px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
}
.section .body > *:first-child { margin-top: 18px; }

/* Figure slot — where G1-G6 land in P5 */
.figure {
  margin: 24px 0; border: 1px solid var(--ridge); border-radius: var(--radius-s);
  background: var(--panel-2); padding: 18px; box-shadow: var(--emboss);
}
.figure .slot {
  aspect-ratio: 16 / 9; border-radius: 6px;
  border: 1px dashed var(--copper-deep);
  background:
    repeating-linear-gradient(45deg, rgba(217,164,65,0.05) 0 12px, transparent 12px 24px);
  display: grid; place-items: center;
  color: var(--faint); font-family: var(--mono); font-size: 12px;
  letter-spacing: 0.08em; text-align: center; padding: 16px;
}
.figure figcaption {
  margin-top: 12px; color: var(--muted);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.03em;
}

/* Use-case + drop-in cards reuse the plate look */
.grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  margin-top: 18px;
}
.card {
  background: var(--panel-2); border: 1px solid var(--ridge);
  border-radius: var(--radius-s); padding: 20px; box-shadow: var(--emboss);
}
.card .tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--copper);
}
.card h3 { margin: 8px 0 10px; color: var(--ink); }

/* Use-case gallery: full scenario cards span the grid for readability */
.grid.cases { grid-template-columns: 1fr; gap: 18px; }
.case p { max-width: none; }
.case pre.code-block { max-width: none; }
.case dl { margin: 14px 0 0; }
.case dt {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--brass); margin-top: 14px;
}
.case dt:first-child { margin-top: 0; }
.case dd { margin: 5px 0 0; color: var(--ink-2); }
.case .figure { margin: 18px 0 0; }

/* ---- Dropzone (the drag-in stub) ----------------------------------------- */
.dropzone {
  margin-top: 22px; border: 2px dashed var(--copper-deep);
  border-radius: var(--radius); padding: clamp(28px, 6vw, 52px);
  text-align: center; background: var(--fill-copper);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease),
              transform 0.2s var(--ease);
  cursor: pointer;
}
.dropzone:hover { border-color: var(--copper); background: var(--fill-amber); }
.dropzone.is-dragover {
  border-color: var(--amber-hot); background: var(--fill-amber);
  transform: scale(1.01); box-shadow: var(--glow-amber);
}
.dropzone .dz-icon {
  font-family: var(--display); font-weight: 900; font-size: 2rem;
  color: var(--amber); margin-bottom: 8px;
}
.dropzone .dz-hint {
  font-family: var(--mono); font-size: 12px; color: var(--muted);
  letter-spacing: 0.04em; margin-top: 10px;
}
.dz-status {
  margin-top: 14px; font-family: var(--mono); font-size: 12.5px;
  color: var(--brass); min-height: 1.2em;
}

/* ---- NotebookLM Studio ---------------------------------------------------- */
.nlm-studio-wrap {
  padding: 72px 0 56px;
  border-top: 1px solid var(--line);
}
.nlm-studio { text-align: center; }
.nlm-kicker {
  display: block;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--brass); margin-bottom: 10px;
}
.nlm-studio h2 {
  font-family: var(--display); font-weight: 900; font-size: clamp(1.6rem, 4vw, 2.4rem);
  color: var(--ink); margin: 0 0 12px;
}
.nlm-lead {
  max-width: 640px; margin: 0 auto 36px; color: var(--ink-2);
  font-size: 15px; line-height: 1.65;
}
.nlm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px; text-align: left; margin-bottom: 28px;
}
.nlm-card {
  background: var(--panel); border: 1px solid var(--ridge);
  border-radius: 10px; padding: 24px;
  box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.nlm-card-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--brass); margin: 0 0 6px;
}
.nlm-card h3 {
  font-family: var(--display); font-weight: 600; font-size: 1.25rem;
  color: var(--ink); margin: 0 0 8px;
}
.nlm-card > p { color: var(--ink-2); font-size: 14px; line-height: 1.55; margin: 0 0 14px; }
.nlm-card audio { width: 100%; margin-bottom: 10px; border-radius: 6px; }
.nlm-media { display: block; margin-bottom: 10px; border-radius: 6px; overflow: hidden; }
.nlm-media img { width: 100%; height: auto; display: block; }
.nlm-actions {
  display: flex; flex-wrap: wrap; gap: 12px; margin-top: auto;
  font-family: var(--mono); font-size: 12.5px;
}
.nlm-actions a { color: var(--amber); text-decoration: none; }
.nlm-actions a:hover { color: var(--amber-hot); }
.nlm-report-preview {
  margin-bottom: 12px; border: 1px solid var(--ridge);
  border-radius: 6px; overflow: hidden;
}
.nlm-report-preview summary {
  cursor: pointer; padding: 10px 14px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  color: var(--brass); background: var(--panel-2);
}
.nlm-report-preview summary:hover { color: var(--amber-hot); }
.nlm-report-excerpt {
  padding: 14px 16px; color: var(--ink-2); font-size: 13.5px; line-height: 1.6;
}
.nlm-report-excerpt p { margin: 0; }
.nlm-note {
  color: var(--muted); font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.03em; text-align: center;
}
.nlm-note a { color: var(--faint); text-decoration: underline; }
.nlm-note a:hover { color: var(--brass); }

/* ---- Footer --------------------------------------------------------------- */
footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 72px;
  color: var(--faint);
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.03em;
}
footer a { color: var(--brass); }
footer .prov { margin-top: 10px; color: var(--muted); }

/* ---- Responsive ----------------------------------------------------------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav-links { display: none; }
  .section > summary { gap: 12px; padding: 20px 18px; }
  .section .num { padding-top: 4px; }
  .hero .meta-row { gap: 16px; }
}

/* ---- Reduced motion ------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .cta:hover, .dropzone.is-dragover { transform: none; }
}