/* ============================================================
   Jacob Kim — base
   Monochrome by design. All the personality is in motion.css
   ============================================================ */

@font-face {
  font-family: 'Omori';
  src: url('../fonts/OMORI_GAME2.ttf') format('truetype');
  font-display: swap;
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5.5rem; }
body { min-height: 100svh; line-height: 1.55; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img, picture, svg, canvas, video, model-viewer { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
a { color: inherit; text-underline-offset: 0.18em; }
ul[role="list"] { list-style: none; padding: 0; }

/* ---- tokens ---- */
:root {
  --ink:   #111110;
  --paper: #f5f3ec;
  --ash:   #6d6b62;
  --line:  #111110;
  --hair:  color-mix(in srgb, var(--ink) 16%, transparent);
  --hard-shadow: 5px 5px 0 var(--ink);

  --wrap: 1160px;
  --gutter: clamp(20px, 5vw, 68px);

  /* one typeface everywhere — the site is thematic, not editorial.
     the aliases stay so component code keeps reading intently. */
  --font-display: 'Omori', 'Trebuchet MS', Verdana, sans-serif;
  --font-body:    'Omori', 'Trebuchet MS', Verdana, sans-serif;
  --font-mono:    'Omori', 'Trebuchet MS', Verdana, sans-serif;

  --step--1: clamp(0.92rem, 0.86rem + 0.24vw, 1.08rem);
  --step-0:  clamp(1.18rem, 1.1rem + 0.34vw, 1.4rem);
  --step-1:  clamp(1.6rem, 1.36rem + 1vw, 2.25rem);
  --step-2:  clamp(2.35rem, 1.8rem + 2.6vw, 4.1rem);
  --step-3:  clamp(3.3rem, 2.3rem + 4.8vw, 7rem);
  --step-4:  clamp(4rem, 1.6rem + 11.5vw, 18rem);
}

body {
  font-family: var(--font-body);
  font-size: var(--step-0);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

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

/* paper grain — warms up the flat monochrome */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 9998;
  pointer-events: none;
  opacity: 0.055;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
@media (prefers-reduced-motion: reduce) { body::after { opacity: 0.03; } }

/* ---- layout primitives ---- */
.wrap { width: min(100% - var(--gutter) * 2, var(--wrap)); margin-inline: auto; }
section { padding-block: clamp(3.5rem, 9vw, 8.5rem); position: relative; }
.stack > * + * { margin-top: 1.1em; }

/* diagonal cut instead of a flat rule */
.divider {
  border: 0;
  height: clamp(7px, 1vw, 13px);
  background: var(--ink);
  clip-path: polygon(0 0, 100% 28%, 100% 100%, 0 72%);
  margin-block: clamp(2.5rem, 7vw, 5rem);
}

/* ---- type ---- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 400; line-height: 1; }
.t-hero { font-family: var(--font-display); font-size: var(--step-4); line-height: 0.84; letter-spacing: -0.015em; }
.t-xl   { font-family: var(--font-display); font-size: var(--step-3); line-height: 0.9; }
.t-lg   { font-family: var(--font-display); font-size: var(--step-2); line-height: 0.95; }
.lede   { font-size: var(--step-1); max-width: 46ch; }
.mono   { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.02em; }
.ash    { color: var(--ash); }
p { max-width: 64ch; }

.kicker {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ash);
  display: inline-block;
}

/* giant halftone-filled section index, slightly askew */
.bignum {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(6rem, 22vw, 20rem);
  line-height: 0.7;
  color: transparent;
  -webkit-text-stroke: 2px var(--ink);
  background-image: radial-gradient(var(--ink) 21%, transparent 24%);
  background-size: 0.14em 0.14em;
  -webkit-background-clip: text;
  background-clip: text;
  transform: rotate(-2deg);
  transform-origin: left bottom;
  pointer-events: none;
  user-select: none;
}

/* ---- header / nav ----
   Hidden at the top of the page; slides down once you start
   scrolling (site.js toggles body.nav-shown). */
.site {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  view-transition-name: site;
  transform: translateY(-100%);
  transition: transform 0.42s cubic-bezier(0.6, 0, 0.12, 1);
}
body.nav-shown .site,
.site:focus-within { transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .site { transition-duration: 0.15s; } }

.nav { display: flex; justify-content: center; padding: 0.9rem 1rem; }
.nav a {
  font-family: var(--font-display);
  font-size: var(--step-0);
  padding: 0.5rem 1.6rem;
  border: 1px solid var(--line);
  text-decoration: none;
  background: var(--paper);
  white-space: nowrap;
  transition: transform 0.18s cubic-bezier(0.5, 0, 0, 1), background 0.16s, color 0.16s, box-shadow 0.18s;
}
.nav a + a { border-left: none; }
.nav a:nth-child(1) { transform: rotate(-1deg); }
.nav a:nth-child(2) { transform: rotate(1deg); }
.nav a:nth-child(3) { transform: rotate(-0.5deg); }
.nav a:hover,
.nav a:focus-visible {
  transform: rotate(0) translate(-2px, -2px);
  background: var(--ink);
  color: var(--paper);
  box-shadow: var(--hard-shadow);
  outline: none;
}
.nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }

/* ---- selected-work grid (square cards) ---- */
.workgrid {
  display: grid;
  gap: clamp(0.9rem, 2vw, 1.6rem);
  grid-template-columns: repeat(3, 1fr);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}
.workcard { display: grid; gap: 1rem; text-decoration: none; align-content: start; }
.workcard__frame {
  aspect-ratio: 1 / 1;
  border: 2px solid var(--line);
  overflow: clip;
  display: grid;
  place-items: center;
  padding: 1rem;
  text-align: center;
  background: repeating-linear-gradient(45deg, transparent 0 11px, var(--hair) 11px 12px);
}
.workcard__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.04);
  transition: transform 0.55s cubic-bezier(0.16, 1, 0.3, 1), filter 0.55s;
}
.workcard:hover .workcard__frame img,
.workcard:focus-visible .workcard__frame img { transform: scale(1.04); filter: grayscale(0); }
.workcard__ph { font-family: var(--font-mono); font-size: var(--step--1); color: var(--ash); }
.workcard__label {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: var(--step-1);
  line-height: 1;
}
.workcard__n { font-size: var(--step--1); color: var(--ash); }
.workcard__go { margin-left: auto; transition: transform 0.35s cubic-bezier(0.7, 0, 0.15, 1); }
.workcard:hover .workcard__go, .workcard:focus-visible .workcard__go { transform: translateX(0.45rem); }

@media (max-width: 820px) {
  .workgrid { grid-template-columns: 1fr; max-width: 30rem; }
}

/* ---- big menu rows (project / nav lists) ---- */
.rows { border-top: 2px solid var(--line); }
.rowlink {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: clamp(0.8rem, 3vw, 2.5rem);
  padding: clamp(1rem, 3.2vw, 2.4rem) 0;
  border-bottom: 2px solid var(--line);
  text-decoration: none;
  overflow: clip;
}
.rowlink::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--ink);
  transform: translateY(101%);
  transition: transform 0.4s cubic-bezier(0.7, 0, 0.15, 1);
  z-index: -1;
}
.rowlink:hover::before,
.rowlink:focus-visible::before { transform: translateY(0); }
.rowlink:hover, .rowlink:focus-visible { color: var(--paper); outline: none; }
.rowlink__i { font-family: var(--font-mono); font-size: var(--step--1); padding-top: 0.6em; }
.rowlink__t { font-family: var(--font-display); font-size: var(--step-2); line-height: 0.95; }
.rowlink__meta { font-family: var(--font-mono); font-size: var(--step--1); color: var(--ash); }
.rowlink:hover .rowlink__meta, .rowlink:focus-visible .rowlink__meta { color: var(--paper); }
.rowlink__go { font-family: var(--font-display); font-size: var(--step-1); transition: transform 0.4s cubic-bezier(0.7, 0, 0.15, 1); }
.rowlink:hover .rowlink__go, .rowlink:focus-visible .rowlink__go { transform: translateX(0.5rem); }

/* ---- spec table ---- */
.spec { border-collapse: collapse; width: 100%; font-family: var(--font-mono); font-size: var(--step--1); }
.spec th, .spec td { text-align: left; padding: 0.65rem 1.2rem 0.65rem 0; border-bottom: 1px solid var(--hair); vertical-align: top; }
.spec th { color: var(--ash); font-weight: 400; text-transform: uppercase; letter-spacing: 0.04em; width: 13rem; }

/* ---- stat block ----
   inverted by default: hard black cells so the numbers stop you.
   box-shadow outlines each cell so a half-filled last row stays clean */
.stats { display: grid; gap: 0; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.stat {
  background: var(--ink);
  color: var(--paper);
  padding: 1.35rem 1.45rem 1.55rem;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--paper) 22%, var(--ink));
}
.stat b { font-family: var(--font-display); font-size: var(--step-2); display: block; line-height: 0.95; }
.stat span {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: color-mix(in srgb, var(--paper) 55%, var(--ink));
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.35rem;
  display: block;
}

/* ---- media placeholder / viewer frame ---- */
.frame {
  border: 2px solid var(--line);
  aspect-ratio: 16 / 10;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1.5rem;
  background:
    repeating-linear-gradient(45deg, transparent 0 11px, var(--hair) 11px 12px);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ash);
}
.frame--tall { aspect-ratio: 4 / 5; }
.frame--wide { aspect-ratio: 21 / 9; }

/* ---- draft marker ---- */
.draft {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 0.15em 0.55em;
  display: inline-block;
  transform: rotate(-1.4deg);
  background: repeating-linear-gradient(45deg, transparent 0 4px, var(--hair) 4px 5px);
}

/* ---- buttons / inline links ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  padding: 0.7rem 1.4rem;
  border: 2px solid var(--line);
  text-decoration: none;
  background: var(--paper);
  transition: transform 0.16s cubic-bezier(0.5, 0, 0, 1), box-shadow 0.16s, background 0.16s, color 0.16s;
}
.btn:hover, .btn:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: var(--hard-shadow);
  background: var(--ink);
  color: var(--paper);
  outline: none;
}
.tlink {
  text-decoration: none;
  background-image: linear-gradient(var(--ink), var(--ink));
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.35s cubic-bezier(0.7, 0, 0.15, 1);
}
.tlink:hover, .tlink:focus-visible { background-size: 0 1px; }

/* ---- footer: engineering title block ---- */
.foot {
  margin-top: clamp(3.5rem, 10vw, 8rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
}
.titleblock {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr;
  gap: 2px;
  background: color-mix(in srgb, var(--paper) 26%, var(--ink));
  border: 2px solid var(--ink);
  font-family: var(--font-mono);
}
.tb {
  background: var(--ink);
  color: var(--paper);
  padding: 0.85rem 1.05rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-height: 3.8rem;
  justify-content: flex-start;
}
.tb__k {
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 50%, var(--ink));
}
.tb__v { font-size: var(--step--1); }
.tb__sub { font-size: 0.72rem; color: color-mix(in srgb, var(--paper) 60%, var(--ink)); }
.tb--name .tb__v { font-family: var(--font-display); font-size: var(--step-1); line-height: 1; }
.tb a { text-decoration: none; color: var(--paper); }
.tb a:hover { text-decoration: underline; }
.tb .tlink { background-image: linear-gradient(var(--paper), var(--paper)); }
@media (max-width: 640px) {
  .titleblock { grid-template-columns: 1fr; }
}

/* ---- drone version rail ---- */
.rail { position: sticky; top: 40vh; display: none; flex-direction: column; gap: 0.4rem; }
.rail a { font-family: var(--font-mono); font-size: var(--step--1); text-decoration: none; color: var(--ash); letter-spacing: 0.1em; }
.rail a.on { color: var(--ink); font-weight: 700; }
.rail a.on::before { content: "▸ "; }

@media (min-width: 1000px) {
  .layout-rail { display: grid; grid-template-columns: 7rem 1fr; gap: var(--gutter); }
  .rail { display: flex; }
}

/* ---- drone version blocks ---- */
.version { padding-block: clamp(2.5rem, 7vw, 5.5rem); border-top: 2px solid var(--line); }
.version:first-of-type { border-top: 0; }
.version__head { display: flex; align-items: flex-end; gap: clamp(1rem, 3vw, 2rem); margin-bottom: clamp(1.5rem, 4vw, 2.5rem); }
.version__head .bignum { font-size: clamp(4.5rem, 13vw, 9rem); line-height: 0.72; }
.changelog { list-style: none; padding: 0; font-family: var(--font-mono); font-size: var(--step--1); }
.changelog li { padding: 0.5rem 0 0.5rem 1.4rem; border-bottom: 1px solid var(--hair); position: relative; }
.changelog li::before { content: "+"; position: absolute; left: 0; font-weight: 700; }

/* ---- code excerpt ---- */
.code {
  border: 2px solid var(--line);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: clamp(0.7rem, 0.62rem + 0.3vw, 0.82rem);
  line-height: 1.6;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}
.code .c { color: color-mix(in srgb, var(--paper) 45%, transparent); }

/* ---- about page / intro ----
   Fallback (mobile, no scroll-timeline, reduced-motion): a plain
   top-anchored hero with the photo + bio beside/below it.
   Enhancement: the hero is its own full-height panel, and the
   photo + bio arrive from the right as you scroll. */
.centre { text-align: center; }

.intro { position: relative; padding: 0; }

.intro__pin {
  display: grid;
  align-content: start;
  gap: clamp(1.8rem, 5vw, 3rem);
  padding-block: clamp(2.5rem, 9vh, 5.5rem) clamp(2.5rem, 8vw, 5rem);
}

.intro__inner {
  width: min(100% - var(--gutter) * 2, var(--wrap));
  margin-inline: auto;
  position: relative;
  display: grid;
  gap: clamp(2rem, 6vw, 3.5rem);
}

.intro__head { text-align: center; }
.intro__kicker {
  margin-bottom: clamp(0.8rem, 2vw, 1.5rem);
  text-transform: none;
  letter-spacing: 0.06em;
  font-size: var(--step-1);
  color: var(--ash);
}
.intro__title {
  font-family: var(--font-display);
  font-size: var(--step-4);
  line-height: 0.84;
  letter-spacing: -0.015em;
}

.intro__panel {
  margin: 0;
  display: grid;
  gap: clamp(1.2rem, 3vw, 1.8rem);
  justify-items: center;
  text-align: center;
}
.intro__photo {
  width: min(320px, 70vw);
  border: 2px solid var(--line);
  filter: grayscale(1) contrast(1.05);
}
.intro__bio { max-width: 42ch; }

@media (min-width: 820px) {
  .intro__inner { grid-template-columns: 1fr 1fr; align-items: center; }
  .intro__head { text-align: left; }
  .intro__title { font-size: var(--step-3); }
  .intro__panel { justify-items: start; text-align: left; }
  .intro__photo { width: min(320px, 30vw); }
}

/* keep the portrait class working elsewhere if referenced */
.portrait { border: 2px solid var(--line); filter: grayscale(1) contrast(1.05); }

/* --- scroll-choreographed intro (JS-driven) ---
   scroll = 0  →  just "Hello, I'm Jacob Kim.", centered, full size
   scroll down →  title de-zooms a little and docks left (covering the
                  left half); the kicker + photo + bio come in on the
                  right half. site.js sets --dock / --panel (0..1).
   No JS / narrow / reduced-motion  →  the static two-column row above.

   Tuning knobs:
     - 0.16 below = how much the title shrinks (smaller = shrinks less)
     - min(48vw, 40rem) = width of the right-hand panel
     - 175vh = total scroll distance of the sequence */
.intro { --dock: 0; --panel: 0; }

@media (min-width: 1000px) and (prefers-reduced-motion: no-preference) {
  html.js .intro { height: 175vh; }

  html.js .intro__pin {
    position: sticky;
    top: 0;
    min-height: 100svh;
    display: grid;
    place-content: center;
    justify-items: center;
    padding: 0;
    overflow: clip;
  }

  /* head + panel positioned against the pin, not each other */
  html.js .intro__inner { display: contents; }

  html.js .intro__head {
    text-align: left;
    width: max-content;
    max-width: 52vw;
    transform-origin: left center;
    transform:
      translateX(calc((var(--gutter) - 50vw + 50%) * var(--dock)))
      scale(calc(1 - 0.1 * var(--dock)));
    will-change: transform;
  }
  html.js .intro__title { font-size: var(--step-4); }
  html.js .intro__kicker { opacity: var(--panel); }

  html.js .intro__panel {
    position: absolute;
    top: 50%;
    right: var(--gutter);
    width: 47vw;
    margin: 0;
    translate: 0 -50%;
    justify-items: start;
    text-align: left;
    opacity: var(--panel);
    transform: translateX(calc(40% * (1 - var(--panel))));
    will-change: opacity, transform;
  }
  html.js .intro__photo { width: min(360px, 26vw); }
  html.js .intro__bio { max-width: none; font-size: var(--step-0); }
}

/* ============================================================
   inversion — black means "stop here, this matters"
   put `class="invert"` on a <section> to flip it. `slab` adds a
   full-bleed feel + a slight P5 diagonal on the top/bottom edge.
   ============================================================ */
.invert,
.slab {
  background: var(--ink);
  color: var(--paper);
}
.slab {
  margin-block: clamp(2.5rem, 7vw, 5.5rem);
  padding-block: clamp(4rem, 10vw, 8rem);
  clip-path: polygon(0 1.1vw, 100% 0, 100% 100%, 0 calc(100% - 1.1vw));
}

:is(.invert, .slab) :is(.kicker, .ash, .rowlink__meta) { color: color-mix(in srgb, var(--paper) 55%, var(--ink)); }
:is(.invert, .slab) :is(.spec th, .spec td, .changelog li) { border-color: color-mix(in srgb, var(--paper) 22%, transparent); }
:is(.invert, .slab) .spec th { color: color-mix(in srgb, var(--paper) 55%, var(--ink)); }
:is(.invert, .slab) .divider { background: var(--paper); }
:is(.invert, .slab) .bignum {
  -webkit-text-stroke-color: var(--paper);
  background-image: radial-gradient(var(--paper) 21%, transparent 24%);
}
:is(.invert, .slab) .tlink { background-image: linear-gradient(var(--paper), var(--paper)); }
:is(.invert, .slab) .code { border-color: var(--paper); }
:is(.invert, .slab) .btn { background: var(--ink); color: var(--paper); border-color: var(--paper); }
:is(.invert, .slab) .btn:hover,
:is(.invert, .slab) .btn:focus-visible { background: var(--paper); color: var(--ink); box-shadow: 5px 5px 0 var(--paper); }

/* stat cells flip to glowing paper when they sit on an inverted band */
:is(.invert, .slab) .stat {
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 0 0 1px var(--paper);
}
:is(.invert, .slab) .stat span { color: var(--ash); }

/* ---- utilities ---- */
.flow > * + * { margin-top: clamp(1.5rem, 4vw, 3rem); }
.pair { display: grid; gap: clamp(1.5rem, 4vw, 3.5rem); }
@media (min-width: 800px) { .pair { grid-template-columns: 1fr 1fr; align-items: start; } }
.wide-scroll { overflow-x: auto; }