/* =========================================================================
   NPTN Design System, colors_and_type.css
   Monochrome. Bold. Almost brutalist. Subtle.
   Import this once at the top of any HTML surface. Everything is a token.
   ========================================================================= */

@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&display=swap");

/* ---- Brand sans: DIN, local files in fonts/ */
@font-face { font-family: "DIN"; src: url("./fonts/DIN-Light.ttf")   format("truetype"); font-weight: 300; font-style: normal; font-display: swap; }
@font-face { font-family: "DIN"; src: url("./fonts/DIN-Regular.ttf") format("truetype"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "DIN"; src: url("./fonts/DIN-Medium.ttf")  format("truetype"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: "DIN"; src: url("./fonts/DIN-Bold.ttf")    format("truetype"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "DIN"; src: url("./fonts/DIN-Bold.ttf")    format("truetype"); font-weight: 900; font-style: normal; font-display: swap; }

/* ---- Brand mono: Roboto Mono */
@font-face { font-family: "Roboto Mono"; src: url("./fonts/RobotoMono-Regular.ttf") format("truetype"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Roboto Mono"; src: url("./fonts/RobotoMono-Bold.ttf") format("truetype"); font-weight: 700; font-style: normal; font-display: swap; }

:root {
  /* ---------- Color: the entire palette ---------------------------------
     Strictly monochromatic. No hue, no accent. Emphasis is carried by
     weight, scale, and inversion, never by chromatic shift. */
  --nptn-black:   #000000;        /* canonical ground (meta theme-color) */
  --nptn-ink-1:   #0A0A0A;        /* card fill */
  --nptn-ink-0:   #1A1A1A;        /* hairline border */
  --nptn-ink-2:   #2A2A2A;        /* divider hover */
  --nptn-mute-1:  #6E6E6E;        /* secondary copy, captions */
  --nptn-mute-2:  #B0B0B0;        /* louder muted */
  --nptn-paper:   #FAFAFA;        /* primary text on black */
  --nptn-white:   #FFFFFF;        /* emphasis, brand mark, CTA */

  /* ---------- Color: semantic ------------------------------------------ */
  --bg:           var(--nptn-black);
  --bg-elev:      var(--nptn-ink-1);
  --bg-invert:    var(--nptn-paper);  /* large emphasis blocks */
  --fg:           var(--nptn-paper);
  --fg-strong:    var(--nptn-white);
  --fg-muted:     var(--nptn-mute-1);
  --fg-soft:      var(--nptn-mute-2);
  --fg-invert:    var(--nptn-black);
  --border:       var(--nptn-ink-0);
  --border-strong:var(--nptn-ink-2);
  --rule:         var(--nptn-paper);  /* heavy brutalist rule */
  --link:         var(--nptn-paper);
  --link-hover:   var(--nptn-white);
  --focus:        var(--nptn-white);

  /* ---------- Type: families ------------------------------------------- */
  --font-sans:    "DIN", "DIN Next LT Pro", "D-DIN", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif:   "Instrument Serif", "Times New Roman", Georgia, serif;
  --font-mono:    "Roboto Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  /* ---------- Type: scale (modular, larger jumps for brutalist hierarchy)  */
  --fs-mono:      12px;
  --fs-caption:   12px;
  --fs-small:     14px;
  --fs-body:      17px;
  --fs-lede:      24px;
  --fs-h4:        22px;
  --fs-h3:        36px;
  --fs-h2:        64px;
  --fs-h1:        112px;
  --fs-display:   clamp(72px, 14vw, 240px);

  /* ---------- Type: weights & metrics ---------------------------------- */
  --fw-regular:   400;
  --fw-medium:    500;
  --fw-bold:      700;
  --fw-black:     900;            /* the brutalist register */

  --lh-display:   0.92;
  --lh-tight:     1.02;
  --lh-snug:      1.18;
  --lh-body:      1.55;
  --lh-loose:     1.75;

  --tracking-mega:    -0.04em;    /* display, 100px+ */
  --tracking-tight:   -0.02em;    /* h1, h2 */
  --tracking-normal:  0;
  --tracking-wide:    0.02em;     /* small caps & buttons */
  --tracking-mark:    0.18em;     /* eyebrow, brand, labels */

  /* ---------- Spacing scale (8px base) --------------------------------- */
  --s-0: 0;
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;
  --s-9: 96px; --s-10: 128px; --s-11: 192px;

  /* ---------- Layout --------------------------------------------------- */
  --measure-prose:  60ch;
  --measure-narrow: 42ch;
  --container-app:  1200px;
  --container-page: 1440px;

  /* ---------- Radii, 0 always ----------------------------------------- */
  --r-0: 0px;

  /* ---------- Strokes -------------------------------------------------- */
  --stroke-hair:   1px;            /* hairline divider */
  --stroke-rule:   2px;            /* standard rule */
  --stroke-bold:   4px;            /* brutalist rule */
  --stroke-mega:   8px;            /* section header bar */

  /* ---------- Motion --------------------------------------------------- */
  --ease:        cubic-bezier(0.2, 0.6, 0.2, 1);
  --dur-fast:    180ms;
  --dur-base:    400ms;
  --dur-slow:    600ms;

  /* ---------- Effects -------------------------------------------------- */
  --hairline:        var(--stroke-hair) solid var(--border);
  --hairline-strong: var(--stroke-hair) solid var(--border-strong);
  --rule-bold:       var(--stroke-bold) solid var(--rule);
  --rule-mega:       var(--stroke-mega) solid var(--rule);
  --blur-veil:       blur(20px);
  --veil:            rgba(0, 0, 0, 0.6);
}

/* ===========================================================================
   Element defaults, surfaces reset to black; weight does the emphasis.
   =========================================================================== */

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--tracking-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--fg-strong); color: var(--nptn-black); }

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  margin: 0;
  color: var(--fg-strong);
}
h1 { font-size: var(--fs-h1); font-weight: var(--fw-black); letter-spacing: var(--tracking-tight); line-height: var(--lh-display); text-transform: uppercase; }
h2 { font-size: var(--fs-h2); font-weight: var(--fw-bold);  letter-spacing: var(--tracking-tight); line-height: var(--lh-tight); }
h3 { font-size: var(--fs-h3); font-weight: var(--fw-bold);  letter-spacing: var(--tracking-tight); line-height: var(--lh-snug); }
h4 { font-size: var(--fs-h4); font-weight: var(--fw-bold);  letter-spacing: var(--tracking-normal); line-height: var(--lh-snug); }

p {
  margin: 0 0 1em 0;
  text-wrap: pretty;
}

/* Opt-in readability cap for long-form prose. Use on landing-page copy
   or anywhere a paragraph would otherwise stretch uncomfortably wide. */
.prose { max-width: var(--measure-prose); }

strong, b {
  font-weight: var(--fw-black);   /* black, not bold, emphasis is loud */
  color: var(--fg-strong);        /* paper → pure white */
}

em, i {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: var(--fw-regular);
  letter-spacing: 0;
  color: var(--fg-strong);
}

a {
  color: var(--link);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% var(--stroke-rule);
  background-repeat: no-repeat;
  background-position: 0 100%;
  padding-bottom: 2px;
  transition: color var(--dur-fast) var(--ease),
              background-size var(--dur-fast) var(--ease);
}
a:hover { color: var(--link-hover); background-size: 100% var(--stroke-rule); font-weight: var(--fw-bold); }
a:focus-visible { outline: var(--stroke-rule) solid var(--focus); outline-offset: 4px; }

code, kbd, samp, pre { font-family: var(--font-mono); font-size: var(--fs-mono); }

small, .caption { font-size: var(--fs-caption); color: var(--fg-muted); letter-spacing: var(--tracking-wide); }

.brand-mark {
  font-family: var(--font-sans);
  font-weight: var(--fw-black);
  letter-spacing: var(--tracking-mark);
  color: var(--fg-strong);
  text-transform: uppercase;
}

.display {
  font-size: var(--fs-display);
  font-weight: var(--fw-black);
  letter-spacing: var(--tracking-mega);
  line-height: var(--lh-display);
  text-transform: uppercase;
  color: var(--fg-strong);
}

.lede {
  font-size: var(--fs-lede);
  line-height: 1.4;
  max-width: var(--measure-prose);
  color: var(--fg);
  font-weight: var(--fw-regular);
}

.eyebrow {
  font-size: var(--fs-caption);
  letter-spacing: var(--tracking-mark);
  text-transform: uppercase;
  color: var(--fg-muted);
  font-weight: var(--fw-medium);
}

/* ---- Buttons ---------------------------------------------------------- */
button, .btn {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--border-strong);
  padding: 12px 20px;
  border-radius: 0;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              background var(--dur-fast) var(--ease);
}
button:hover, .btn:hover { color: var(--nptn-black); background: var(--fg-strong); border-color: var(--fg-strong); }
button:focus-visible, .btn:focus-visible { outline: var(--stroke-rule) solid var(--focus); outline-offset: 4px; }

.btn--primary { color: var(--fg-invert); background: var(--bg-invert); border-color: var(--bg-invert); }
.btn--primary:hover { color: var(--fg); background: transparent; border-color: var(--border-strong); }

/* ---- Inputs ----------------------------------------------------------- */
input, textarea, select {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  color: var(--fg);
  background: transparent;
  border: 0;
  border-bottom: var(--stroke-rule) solid var(--border-strong);
  padding: 12px 0;
  outline: 0;
  border-radius: 0;
  transition: border-color var(--dur-fast) var(--ease);
}
input:focus, textarea:focus, select:focus { border-bottom-color: var(--focus); }

/* ---- Rules ------------------------------------------------------------ */
hr { border: 0; border-top: var(--hairline); margin: var(--s-7) 0; }
.rule       { border: 0; border-top: var(--stroke-rule) solid var(--fg);     margin: var(--s-6) 0; }
.rule--bold { border: 0; border-top: var(--rule-bold);                       margin: var(--s-6) 0; }
.rule--mega { border: 0; border-top: var(--rule-mega);                       margin: var(--s-7) 0; }

/* ---- Emphasis blocks (paper-on-black brutalism) ---------------------- */
.block-invert {
  background: var(--bg-invert);
  color: var(--fg-invert);
  padding: var(--s-7) var(--s-7);
}
.block-invert strong { color: var(--fg-invert); }