/*
 * Design tokens, extracted from the reference course deck (see STYLE-GUIDE.md)
 * (rendered pages sampled with Pillow; hex values are measured, not guessed).
 * Fonts in the PDF are unnamed Type 3 outlines; identified visually as Inter.
 */

/* Inter variable, Latin subset (SIL OFL), self-hosted. Upright only: the copy has no italics. */
@font-face {
  font-family: "Inter";
  src: url("/fonts/inter-latin-wght-normal.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  /* ---- Color: measured ---- */
  --ink: #030605;              /* near-black, green-tinted. Dark slide bg + text on light */
  --ink-raised: #161918;       /* panel/column surface on dark slides */
  --ink-border: #222524;       /* hairlines and dividers on dark */
  --mint: #deeade;             /* signature pale sage slide bg */
  --mint-border: #c2cdc2;      /* rules on mint */
  --mint-muted: #4f5550;       /* secondary text on mint (6.2:1) */
  --paper: #ffffff;
  --paper-grey: #dedede;       /* neutral light slide bg */
  --paper-grey-muted: #505050; /* secondary text on grey (6.0:1) */
  --slate: #6e8586;            /* teal-grey: muted text / examples on dark (5.2:1 on ink) */
  --slate-chip: #637074;       /* flat chip fill seen on gradient slides */
  --grey-300: #a7a8a7;         /* secondary text on dark (8.5:1 on ink) */
  --grey-600: #5b5d5d;         /* tertiary on dark: decorative only (3.1:1) */

  /* Cover gradient: ink at top → cool slate at bottom (sampled down the left edge) */
  --gradient-cover: linear-gradient(180deg, #030605 0%, #061013 30%, #16272b 50%, #415055 70%, #7a8787 100%);
  /* Text-safe variants: stop before the light end so muted text keeps AA (grey-300 ≥ 4.9:1) */
  --gradient-hero: linear-gradient(180deg, #030605 0%, #061013 35%, #16272b 75%, #2a3a3e 100%);
  --gradient-section: linear-gradient(180deg, #030605 0%, #0b191c 60%, #16272b 100%);

  /* ---- Semantic roles ---- */
  --bg: var(--ink);
  --surface: var(--ink-raised);
  --text: var(--paper);
  --text-muted: var(--grey-300);
  --text-subtle: var(--slate);
  --border: var(--ink-border);
  --accent: var(--mint);          /* the one accent: buttons + key numbers on dark */
  --accent-ink: var(--ink);       /* text on accent */
  --accent-secondary: var(--slate);

  /* Light section roles (mint / white sections) */
  --bg-light: var(--mint);
  --text-on-light: var(--ink);
  --text-muted-on-light: var(--mint-muted);
  --border-on-light: var(--mint-border);

  /* Risk lanes: muted, derived (not in deck) from its attention-bar hues.
     Use ONLY for green/yellow/red lanes and the scorecard. */
  --risk-green: #7fa36b;
  --risk-amber: #c8954a;
  --risk-red: #b5534b;

  --focus-ring: 0 0 0 3px var(--mint);

  /* ---- Type ---- */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;   /* bold table labels, run-in heads */
  --fw-bold: 700;       /* eyebrow lead word ("MODULE 2") */

  /* Fluid scale, mobile → desktop. Deck titles are large, regular-weight, tight. */
  --fs-xs: 0.8125rem;                         /* 13  source lines, fine print */
  --fs-eyebrow: 0.8125rem;                    /* 13  tracked caps */
  --fs-sm: 0.9375rem;                         /* 15  microcopy, labels */
  --fs-body: clamp(1.0625rem, 1rem + 0.2vw, 1.125rem); /* 17–18 */
  --fs-lead: clamp(1.1875rem, 1.1rem + 0.4vw, 1.375rem); /* 19–22 */
  --fs-h3: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);   /* 20–24 */
  --fs-h2: clamp(1.875rem, 1.5rem + 1.6vw, 2.75rem);  /* 30–44 */
  --fs-h1: clamp(2.75rem, 2rem + 3.6vw, 5rem);        /* 44–80 */
  --fs-stat: clamp(4rem, 3rem + 5vw, 7.5rem);         /* big 83% */
  --fs-quote: clamp(1.625rem, 1.3rem + 1.4vw, 2.5rem);

  --lh-tight: 1.1;
  --lh-snug: 1.25;
  --lh-body: 1.55;

  --ls-tight: -0.02em;   /* large titles */
  --ls-normal: 0;
  --ls-eyebrow: 0.2em;   /* "M O D U L E 2 / ..." */
  --ls-chip: 0.16em;     /* tracked caps in flow chips */

  --measure: 68ch;

  /* ---- Shape ---- */
  --radius-0: 0;        /* chips, tables, column panels: deck is square-edged */
  --radius-sm: 4px;     /* small cards ("TEXT PAGE" tiles) */
  --radius-md: 8px;
  --radius-full: 999px; /* numbered step circles */
  --hairline: 1px solid var(--border);

  /* ---- Spacing (4px base) ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;
  --section-pad: clamp(4rem, 3rem + 5vw, 8rem);
  --gutter: clamp(1rem, 0.5rem + 2.5vw, 4rem);
  --container: 1200px;

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur: 400ms;
}

@media (prefers-reduced-motion: reduce) {
  :root { --dur: 0ms; }
}