/* ============================================================
   AC-27 — mecha adaptation of the 601 Inc. style reference
   Palette shift:  celluloid cream  -> titanium parchment
                   darkroom shadow  -> hangar gunmetal
                   (new) hazard orange — the single accent
   Paneling shift: 0px-radius chrome -> chamfered corners,
                   corner brackets, hazard-stripe rules
   Discipline kept: one display face, weight 400 only,
                   1px hairlines, no shadows, no fills,
                   full-bleed, 120px section gaps
   ============================================================ */

:root {
  /* Colors */
  --color-void: #060707;            /* projection black, cooled */
  --color-hangar: #101311;          /* darkroom shadow, darkened to gunmetal */
  --color-titanium: #e2dcc4;        /* celluloid cream, desaturated to titanium */
  --color-titanium-dim: rgba(226, 220, 196, 0.55);
  --color-titanium-faint: rgba(226, 220, 196, 0.22);
  --color-hazard: #ff531f;          /* warning stripe / active state — used sparingly */

  /* Typography */
  --font-display: 'Chakra Petch', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* Spacing (601 scale) */
  --spacing-4: 4px;
  --spacing-9: 9px;
  --spacing-12: 12px;
  --spacing-21: 21px;
  --spacing-24: 24px;
  --spacing-28: 28px;
  --spacing-30: 30px;
  --section-gap: 120px;

  /* Edges */
  --hairline: 1px solid var(--color-titanium);
  --seam: 1px solid var(--color-titanium-faint);
  --chamfer: 14px;

  /* Flap board */
  --flip-ms: 90ms;
}

/* ---------- reset ---------- */

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

html { scroll-behavior: smooth; }

body {
  background: var(--color-hangar);
  color: var(--color-titanium);
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.01em;
  min-height: 100vh;
  overflow-x: hidden;
}

button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a { color: inherit; }
.mono { font-family: var(--font-mono); letter-spacing: 0.08em; }

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

::selection { background: var(--color-hazard); color: var(--color-void); }

/* ---------- top chrome ---------- */

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-21);
  padding: var(--spacing-12) var(--spacing-21);
  background: var(--color-hangar);
  border-bottom: var(--hairline);
}

.ident { display: flex; flex-direction: column; gap: 2px; }
.ident-name { font-size: 18px; letter-spacing: 0.04em; }
.ident-sub { font-size: 10px; color: var(--color-titanium-dim); }

.nav { display: flex; align-items: center; gap: var(--spacing-9); flex-wrap: wrap; justify-content: flex-end; }

.nav-link {
  font-size: clamp(13px, 1.6vw, 19px);
  letter-spacing: 0.02em;
  padding: var(--spacing-4) var(--spacing-9);
  color: var(--color-titanium-dim);
  transition: color 120ms linear;
}
.nav-link:hover { color: var(--color-titanium); }
.nav-link[aria-selected="true"] { color: var(--color-hazard); }
.nav-link:focus-visible { outline: 1px solid var(--color-hazard); outline-offset: 2px; }

.nav-sep { color: var(--color-titanium-faint); font-size: 14px; }

/* ---------- split-flap board band ---------- */

.board-band {
  position: relative;
  padding: calc(96px + var(--spacing-30)) 0 var(--spacing-30) 0; /* clears fixed bar */
  background: var(--color-hangar);
}

.board-frame {
  position: relative;
  padding: var(--spacing-24) 0 var(--spacing-24) var(--spacing-21);
}

/* registration crosses at the frame corners */
.reg-mark {
  position: absolute;
  width: 13px; height: 13px;
}
.reg-mark::before, .reg-mark::after {
  content: ""; position: absolute; background: var(--color-titanium-dim);
}
.reg-mark::before { left: 6px; top: 0; width: 1px; height: 13px; }
.reg-mark::after  { left: 0; top: 6px; width: 13px; height: 1px; }
.reg-mark.tl { top: 0; left: var(--spacing-21); }
.reg-mark.tr { top: 0; right: var(--spacing-21); }
.reg-mark.bl { bottom: 0; left: var(--spacing-21); }
.reg-mark.br { bottom: 0; right: var(--spacing-21); }

/* the board itself — anchored to the left edge, 601-style */
.flapboard {
  display: flex;
  gap: clamp(3px, 0.5vw, 8px);
  font-size: clamp(34px, 8.4vw, 148px);
  letter-spacing: -0.04em;
  line-height: 1;
  user-select: none;
}

.cell {
  position: relative;
  width: 0.78em;
  height: 1.18em;
  background: var(--color-void);
  border: 1px solid var(--color-titanium-faint);
  perspective: 4.5em;
}

.cell .half, .cell .flap {
  position: absolute;
  left: 0;
  width: 100%;
  height: 50%;
  overflow: hidden;
}
.cell .half.top, .cell .flap.up { top: 0; }
.cell .half.bottom, .cell .flap.down { bottom: 0; }

.cell .half span, .cell .flap span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 200%;
  display: grid;
  place-items: center;
}
.cell .half.top span, .cell .flap.up span { top: 0; }
.cell .half.bottom span, .cell .flap.down span { bottom: 0; }

.cell .flap {
  z-index: 2;
  background: var(--color-void);
  backface-visibility: hidden;
  visibility: hidden;
}
.cell .flap.up { transform-origin: center bottom; }
.cell .flap.down { transform-origin: center top; transform: rotateX(90deg); }

.cell.flipping .flap { visibility: visible; }
.cell.flipping .flap.up { animation: flap-up var(--flip-ms) linear forwards; }
.cell.flipping .flap.down { animation: flap-down var(--flip-ms) linear forwards; }

@keyframes flap-up {
  0%        { transform: rotateX(0deg); }
  50%, 100% { transform: rotateX(-90deg); }
}
@keyframes flap-down {
  0%, 50%   { transform: rotateX(90deg); }
  100%      { transform: rotateX(0deg); }
}

/* hinge line across the middle of every cell */
.cell::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  height: 1px;
  background: var(--color-hangar);
  z-index: 3;
}

.board-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-12) var(--spacing-30);
  padding: var(--spacing-12) var(--spacing-21) 0;
  font-size: 11px;
  color: var(--color-titanium-dim);
}
#board-index { color: var(--color-hazard); }

/* vertical katakana annotation, right edge */
.kana {
  position: absolute;
  right: var(--spacing-9);
  top: 50%;
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--color-titanium-faint);
}

/* ---------- hazard stripe rule ---------- */

.hazard-rule {
  height: 10px;
  border-top: var(--seam);
  border-bottom: var(--seam);
  background: repeating-linear-gradient(
    -45deg,
    var(--color-hazard) 0 10px,
    transparent 10px 22px
  );
  opacity: 0.85;
}

/* ---------- panels ---------- */

#content { padding-bottom: var(--section-gap); }

.panel {
  position: relative;
  padding: var(--section-gap) var(--spacing-21) 0;
}
.panel:focus { outline: none; }

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-21);
  font-size: 11px;
  color: var(--color-titanium-dim);
  border-bottom: var(--hairline);
  padding-bottom: var(--spacing-9);
  margin-bottom: var(--spacing-30);
}

/* outline-stroke unit numerals floating behind content */
.bg-numeral {
  position: absolute;
  top: var(--spacing-30);
  right: var(--spacing-21);
  font-size: clamp(120px, 22vw, 280px);
  letter-spacing: -0.04em;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-titanium-faint);
  pointer-events: none;
  z-index: 0;
}

.lede {
  position: relative;
  font-size: clamp(26px, 4.2vw, 54px);
  letter-spacing: -0.02em;
  line-height: 1.18;
  max-width: 18em;
  margin-bottom: var(--spacing-30);
}

/* ---------- datasheet ---------- */

.datasheet { border-top: var(--seam); }

.data-row {
  display: grid;
  grid-template-columns: minmax(140px, 220px) 1fr;
  gap: var(--spacing-21);
  padding: var(--spacing-12) 0;
  border-bottom: var(--seam);
  align-items: baseline;
}
.data-key { font-size: 11px; color: var(--color-titanium-dim); }
.data-val { font-size: clamp(14px, 1.8vw, 20px); letter-spacing: 0.01em; }

a.data-val.link { text-decoration: none; transition: color 120ms linear; }
a.data-val.link:hover, a.data-val.link:focus-visible { color: var(--color-hazard); }

/* ---------- experience / project entries ---------- */

.entry {
  position: relative;
  display: grid;
  grid-template-columns: clamp(80px, 14vw, 200px) 1fr;
  gap: var(--spacing-21);
  padding: var(--spacing-30) 0;
  border-bottom: var(--seam);
}
.entry:last-child { border-bottom: none; }

.entry-num {
  font-size: clamp(64px, 10vw, 160px);
  letter-spacing: -0.04em;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-titanium-dim);
}

.entry-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--spacing-9) var(--spacing-21);
  margin-bottom: var(--spacing-9);
}
.entry-role { font-size: clamp(20px, 2.6vw, 32px); font-weight: 400; letter-spacing: -0.01em; }
.entry-co { font-size: clamp(13px, 1.6vw, 17px); color: var(--color-titanium-dim); }
.entry-date { margin-left: auto; font-size: 11px; color: var(--color-hazard); white-space: nowrap; }

.stack {
  font-size: 11px;
  color: var(--color-titanium-dim);
  margin-bottom: var(--spacing-12);
}

.entry-list { list-style: none; }
.entry-list li {
  position: relative;
  font-size: clamp(14px, 1.7vw, 18px);
  line-height: 1.55;
  padding-left: var(--spacing-24);
  margin-bottom: var(--spacing-4);
  color: var(--color-titanium);
}
.entry-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-hazard);
}

/* ---------- chamfered outlined link (the system's one action) ---------- */

.outlink {
  display: inline-block;
  margin-top: var(--spacing-21);
  background: var(--color-titanium);
  clip-path: polygon(
    0 0,
    calc(100% - var(--chamfer)) 0,
    100% var(--chamfer),
    100% 100%,
    var(--chamfer) 100%,
    0 calc(100% - var(--chamfer))
  );
  padding: 1px;
  text-decoration: none;
  transition: background 120ms linear;
}
.outlink span {
  display: inline-block;
  background: var(--color-hangar);
  clip-path: polygon(
    0 0,
    calc(100% - var(--chamfer)) 0,
    100% var(--chamfer),
    100% 100%,
    var(--chamfer) 100%,
    0 calc(100% - var(--chamfer))
  );
  padding: var(--spacing-12) var(--spacing-21);
  font-size: clamp(14px, 1.7vw, 19px);
  letter-spacing: 0.04em;
  color: var(--color-titanium);
  transition: color 120ms linear;
}
.outlink:hover, .outlink:focus-visible { background: var(--color-hazard); }
.outlink:hover span, .outlink:focus-visible span { color: var(--color-hazard); }

.outlink.xl { margin-bottom: var(--spacing-30); }
.outlink.xl span {
  font-size: clamp(22px, 3.4vw, 30px);
  padding: var(--spacing-12) var(--spacing-30);
}

/* ---------- skills racks ---------- */

.rack { margin-bottom: var(--spacing-30); }

.rack-label {
  font-size: clamp(20px, 2.6vw, 32px);
  font-weight: 400;
  letter-spacing: -0.01em;
  border-bottom: var(--seam);
  padding-bottom: var(--spacing-9);
  margin-bottom: var(--spacing-21);
}

.chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-9);
}
.chips li {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: var(--spacing-9) var(--spacing-12);
  border: 1px solid var(--color-titanium-faint);
  clip-path: polygon(
    0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%
  );
  transition: border-color 120ms linear, color 120ms linear;
}
.chips li:hover { border-color: var(--color-hazard); color: var(--color-hazard); }

/* ---------- footer ---------- */

.footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-12) var(--spacing-30);
  padding: var(--spacing-24) var(--spacing-21);
  border-top: var(--hairline);
  font-size: 10px;
  color: var(--color-titanium-dim);
}

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  .topbar { flex-direction: column; align-items: flex-start; gap: var(--spacing-9); }
  .board-band { padding-top: calc(132px + var(--spacing-30)); }
  .entry { grid-template-columns: 1fr; }
  .entry-num { position: absolute; top: var(--spacing-12); right: 0; opacity: 0.5; }
  .kana { display: none; }
  .bg-numeral { opacity: 0.5; }
  .entry-date { margin-left: 0; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cell.flipping .flap { animation: none; visibility: hidden; }
  * { transition-duration: 0.01ms !important; }
}