/* =============================================================
   DRAWING SET — design system
   A portfolio built in the visual language of a construction
   drawing set: drafting paper, hairline rules, sheet numbers,
   dimension annotations, hi-vis marker highlights.
   ============================================================= */

:root {
  /* --- ground: warm drafting paper --- */
  --paper:      #F2F0EA;
  --paper-2:    #EAE7DF;
  --paper-3:    #E1DDD3;

  /* --- ink --- */
  --ink:        #16170F;
  --ink-2:      #3A3C33;
  --graphite:   #6B6D62;
  --graphite-2: #9B9C92;

  /* --- hi-vis: lifted straight off the safety vest --- */
  --vis:        #C9E82A;
  --vis-deep:   #A6C511;
  --vis-wash:   rgba(201, 232, 42, 0.30);

  /* --- signal: revision clouds, critical path --- */
  --signal:     #D4402A;
  --water:      #2E5C7A;

  /* --- lines --- */
  --rule:       rgba(22, 23, 15, 0.14);
  --rule-soft:  rgba(22, 23, 15, 0.07);
  --rule-firm:  rgba(22, 23, 15, 0.32);

  /* --- dark plate (full-bleed photo sections + games/typing) --- */
  --plate:      #14150F;
  --plate-2:    #1D1F16;
  --plate-3:    #282A1F;
  --on-plate:   #F2F0EA;
  --on-plate-dim: rgba(242, 240, 234, 0.62);
  --plate-rule: rgba(242, 240, 234, 0.16);

  /* --- type --- */
  --display: 'Archivo', 'Arial Black', system-ui, sans-serif;
  --body:    'Instrument Sans', 'Segoe UI', Helvetica, Arial, sans-serif;
  --mono:    'JetBrains Mono', ui-monospace, 'Courier New', monospace;

  /* --- metrics --- */
  --rail:    76px;          /* left sheet-rail width on desktop */
  --gutter:  clamp(1.25rem, 4vw, 4rem);
  --measure: 68ch;
  --shell:   1240px;

  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
  --ease-firm: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ===================== reset ===================== */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.62;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* the paper itself: a faint drafting grid + tooth */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--rule-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-soft) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px;
  opacity: 0.85;
}
body > * { position: relative; z-index: 1; }

/* clear the fixed sheet rail */
@media (min-width: 901px) {
  body { padding-left: var(--rail); }
}

img, svg, canvas, iframe { display: block; max-width: 100%; }
img { height: auto; }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--vis); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ===================== typography ===================== */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -0.03em;
  font-stretch: 112%;
  text-wrap: balance;
}

.t-display {
  font-family: var(--display);
  font-weight: 800;
  font-stretch: 118%;
  letter-spacing: -0.04em;
  line-height: 0.92;
  font-size: clamp(3.2rem, 11vw, 8.5rem);
}

.t-section {
  font-family: var(--display);
  font-weight: 800;
  font-stretch: 115%;
  letter-spacing: -0.032em;
  line-height: 0.98;
  font-size: clamp(2.1rem, 5.2vw, 4.1rem);
}
.t-section em {
  font-style: normal;
  color: transparent;
  -webkit-text-stroke: 1.2px var(--ink);
  paint-order: stroke fill;
}

.t-lead {
  font-size: clamp(1.08rem, 1rem + 0.5vw, 1.38rem);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 46ch;
  text-wrap: pretty;
}

/* the drawing-lettering voice: labels, sheet numbers, data */
.t-label {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--graphite);
}

.t-mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* hi-vis marker sweep — as if someone highlighted the drawing */
.mark {
  background-image: linear-gradient(var(--vis-wash), var(--vis-wash));
  background-repeat: no-repeat;
  background-position: 0 88%;
  background-size: 0% 0.62em;
  padding: 0 0.08em;
  transition: background-size 0.7s var(--ease) 0.15s;
}
.is-in .mark, .mark.is-lit { background-size: 100% 0.62em; }

/* ===================== layout ===================== */
.shell {
  width: min(100% - (var(--gutter) * 2), var(--shell));
  margin-inline: auto;
}

.sheet {
  position: relative;
  padding-block: clamp(4.5rem, 11vh, 8.5rem);
}
.sheet + .sheet { border-top: 1px solid var(--rule); }

/* section header: sheet designation + title, drawing-style */
.sheet-head {
  display: grid;
  gap: 1.1rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.sheet-id {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--graphite);
}
.sheet-id::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}
.sheet-id b {
  font-weight: 500;
  color: var(--ink);
  border: 1px solid var(--rule-firm);
  padding: 0.18rem 0.5rem;
}

/* ===================== controls ===================== */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.82rem 1.5rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease),
              background-color 0.22s var(--ease), color 0.22s var(--ease);
}
.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--ink);
}
.btn:active { transform: translate(0, 0); box-shadow: 0 0 0 var(--ink); }

.btn--vis { --btn-bg: var(--vis); --btn-fg: var(--ink); }
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border-color: var(--rule-firm);
}
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

.btn--sm { padding: 0.55rem 1rem; font-size: 0.6875rem; }

/* form fields, drawn like schedule inputs */
.field { display: grid; gap: 0.4rem; }
.field > span {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
}
input, select, textarea {
  width: 100%;
  padding: 0.68rem 0.85rem;
  background: var(--paper);
  border: 1px solid var(--rule-firm);
  border-radius: 0;
  font-family: var(--mono);
  font-size: 0.875rem;
  transition: border-color 0.18s, box-shadow 0.18s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--vis);
}
textarea { resize: vertical; min-height: 7rem; line-height: 1.6; }
select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink) 50%),
    linear-gradient(135deg, var(--ink) 50%, transparent 50%);
  background-position: calc(100% - 17px) 50%, calc(100% - 12px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2.2rem;
}

/* ===================== reveal ===================== */
.rise {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}
.rise.is-in { opacity: 1; transform: none; }

/* ===================== a11y ===================== */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 0.9rem 1.4rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.skip:focus { left: 1rem; top: 1rem; }

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