/* luketr.ee — shell + scene styles */
@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter:wght@400;450;500;600;700&display=swap');

/* ============ variables & reset ============ */
:root {
  --bg-page: #FAFAFA;
  --fg: #15161A;
  --muted: #6B6E76;
  --border: #E7E7E9;
  --surface: #FFFFFF;
  --accent: #2F6FEB;

  --card-bg: rgba(255,255,255,0.66);
  --card-bg-hi: rgba(255,255,255,0.86);
  --card-border: rgba(17,18,22,0.09);
  --tile-bg: #FFFFFF;
  --tile-border: rgba(17,18,22,0.08);
  --shell-fg: var(--fg);
  --shell-muted: var(--muted);
  --ring: rgba(17,18,22,0.06);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-serif: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;
  --mono: ui-monospace, 'JetBrains Mono', 'SF Mono', monospace;

  --maxw: 600px;
  --gap: 13px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100%;
  overflow-x: hidden;
}

/* ============ layout ============ */
.bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
.bg canvas { display: block; width: 100%; height: 100%; }

.page {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(56px, 11vh, 120px) clamp(18px, 5vw, 28px) 72px;
  min-height: 100vh;
}

/* ============ header ============ */
.lk-head { text-align: center; margin-bottom: clamp(30px, 5vh, 46px); }

/* avatar — rounded square with inline SVG (serif l + cobalt dot) */
.lk-avatar {
  width: 84px; height: 84px;
  margin: 0 auto 20px;
  border-radius: 20px;
  display: grid; place-items: center;
  background: #FFFFFF;
  border: 1px solid var(--card-border);
  box-shadow: 0 10px 30px -16px rgba(17,18,22,.4);
  color: #15161A;
  overflow: hidden;
}
.lk-avatar::after { content: none; }
.lk-avatar svg { width: 100%; height: 100%; display: block; }
[data-tone="dark"] .lk-avatar { background: #1A1D24; color: #F3F4F8; }

.lk-handle {
  font-family: var(--font-serif);
  font-size: clamp(40px, 9vw, 58px);
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--shell-fg);
  line-height: 1;
}
.lk-handle .a { opacity: .58; }
.lk-handle .b { font-style: italic; font-weight: 500; }
.lk-handle .dot { color: var(--accent); font-style: italic; }

.lk-tag {
  margin: 13px auto 0;
  font-size: clamp(14px, 2.6vw, 15.5px);
  font-weight: 450;
  color: var(--shell-muted);
  max-width: 34ch;
  line-height: 1.5;
  text-wrap: pretty;
}

/* social row */
.lk-social { display: flex; justify-content: center; gap: 9px; margin-top: 22px; }
.lk-social a {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--shell-fg);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  transition: transform .22s cubic-bezier(.2,.7,.2,1), color .22s ease, border-color .22s ease, background .22s ease;
}
.lk-social a:hover {
  transform: translateY(-2px);
  color: var(--accent);
  background: var(--card-bg-hi);
  border-color: color-mix(in oklab, var(--accent) 42%, var(--card-border));
}
.lk-social svg { width: 18px; height: 18px; }

/* section eyebrow */
.lk-eyebrow {
  display: flex; align-items: center; gap: 10px;
  margin: 0 4px 14px;
  font-family: var(--mono);
  font-size: 11px; font-weight: 500; letter-spacing: .14em; text-transform: uppercase;
  color: var(--shell-muted);
}
.lk-eyebrow::after { content: ""; flex: 1; height: 1px; background: var(--card-border); }

/* ============ category chips ============ */
.lk-cats { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin: 0 0 22px; }
.lk-chip {
  font: 500 12.5px/1 var(--font); letter-spacing: .01em;
  padding: 9px 15px; border-radius: 999px; cursor: pointer;
  color: var(--shell-fg); background: var(--card-bg); border: 1px solid var(--card-border);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease;
}
.lk-chip:hover { transform: translateY(-1px); border-color: color-mix(in oklab, var(--accent) 40%, var(--card-border)); }
.lk-chip.on {
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 14%, var(--card-bg));
  border-color: color-mix(in oklab, var(--accent) 55%, var(--card-border));
}

/* ============ link stack ============ */
.lk-links { display: flex; flex-direction: column; gap: var(--gap); }

.lk-link {
  position: relative;
  display: flex; align-items: center; gap: 15px;
  padding: 13px 16px 13px 13px;
  border-radius: 17px;
  color: var(--shell-fg);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(255,255,255,.35) inset;
  overflow: hidden;
  transition: transform .26s cubic-bezier(.2,.7,.2,1), background .26s ease, border-color .26s ease, box-shadow .26s ease;
  opacity: 0; transform: translateY(14px);
}
.lk-link.in { opacity: 1; transform: translateY(0); }
.lk-link:hover {
  background: var(--card-bg-hi);
  border-color: color-mix(in oklab, var(--accent) 34%, var(--card-border));
  box-shadow: 0 14px 34px -22px rgba(17,18,22,.55);
  transform: translateY(-2px);
}
.lk-link::before {
  content: ""; position: absolute; left: 0; top: 12%; bottom: 12%; width: 2.5px;
  border-radius: 0 3px 3px 0;
  background: var(--accent);
  transform: scaleY(0); transform-origin: center;
  transition: transform .26s cubic-bezier(.2,.7,.2,1);
}
.lk-link:hover::before { transform: scaleY(1); }
.lk-link[hidden] { display: none; }

/* stretched main-link overlay (enables nested <a> for hackathon links) */
.lk-link > .lk-stretch {
  position: absolute; inset: 0; z-index: 1;
  border-radius: inherit;
  text-decoration: none;
}
.lk-link > .lk-logo,
.lk-link > .lk-link-body,
.lk-link > .lk-link-meta { position: relative; z-index: 2; pointer-events: none; }
.lk-link .lk-link-body .hk,
.lk-link .lk-link-body .lk-link-gh,
.lk-link .lk-link-body .yc-link { pointer-events: auto; }

/* logo tile */
.lk-logo {
  flex: none;
  width: 50px; height: 50px;
  border-radius: 14px;
  display: grid; place-items: center;
  background: var(--tile-bg);
  border: 1px solid var(--tile-border);
  box-shadow: 0 2px 8px -4px rgba(17,18,22,.28);
  overflow: hidden;
}
.lk-logo img { width: 30px; height: 30px; object-fit: contain; display: block; }
.lk-logo .mono-mark {
  font-family: var(--font-serif);
  font-size: 24px; font-weight: 400;
  color: var(--shell-fg);
}

.lk-link-body { flex: 1; min-width: 0; overflow: hidden; }
.lk-link-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 600; letter-spacing: -0.01em;
  line-height: 1.2;
}
.lk-link-desc {
  margin-top: 2px;
  font-size: 13px; font-weight: 450;
  color: var(--shell-muted);
  line-height: 1.4;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.lk-pill {
  font-family: var(--mono);
  font-size: 9px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em;
  color: var(--shell-muted);
  border: 1px solid var(--card-border);
  padding: 2px 6px; border-radius: 999px;
  background: color-mix(in oklab, var(--shell-fg) 4%, transparent);
}

.lk-link-meta { flex: none; display: flex; align-items: center; gap: 12px; }
.lk-host {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--shell-muted);
}
@media (max-width: 460px) { .lk-host { display: none; } }
.lk-arrow { color: var(--shell-muted); transition: transform .22s ease, color .22s ease; }
.lk-link:hover .lk-arrow { transform: translateX(2px); color: var(--accent); }

/* ============ GitHub icon (inline after title) ============ */
.lk-link-gh {
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  width: 22px; height: 22px; border-radius: 6px;
  border: 0; background: transparent; cursor: pointer;
  color: var(--shell-muted);
  text-decoration: none;
  transition: background .18s ease, color .18s ease;
}
.lk-link-gh svg { width: 14px; height: 14px; display: block; }
.lk-link-gh:hover {
  background: color-mix(in oklab, var(--shell-fg) 8%, transparent);
  color: var(--shell-fg);
}

/* ============ hackathon badge ============ */
.lk-hack {
  margin-top: 5px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .01em;
  color: var(--shell-muted);
  display: flex; align-items: center; gap: 7px; flex-wrap: nowrap;
  overflow: hidden;
  line-height: 1.3;
}
.lk-hack .tr { display: inline-flex; align-items: center; color: #B8860B; }
.lk-hack .tr svg { width: 11px; height: 11px; }
.lk-hack .place { color: #9A6B12; font-weight: 600; }
.lk-hack .prize { color: var(--shell-fg); font-weight: 600; }
.lk-hack .dv { opacity: .4; }
.lk-hack .hk {
  color: var(--shell-muted); text-decoration: none;
  border-bottom: 1px solid var(--card-border); padding-bottom: 1px;
  transition: color .2s ease, border-color .2s ease;
}
.lk-hack .hk:hover { color: var(--accent); border-color: color-mix(in oklab, var(--accent) 50%, transparent); }
[data-tone="dark"] .lk-hack .tr { color: #E0B84E; }
[data-tone="dark"] .lk-hack .place { color: #E5C067; }

/* ============ Y Combinator badge ============ */
.lk-yc {
  margin-top: 5px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: .01em;
  color: var(--shell-muted);
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  line-height: 1.3;
}
.lk-yc .yc-icon { display: inline-flex; align-items: center; flex-shrink: 0; }
.lk-yc .yc-batch { color: #E05D00; font-weight: 600; }
.lk-yc .yc-dv { opacity: .4; }
.lk-yc .yc-link {
  color: var(--shell-muted); text-decoration: none;
  border-bottom: 1px solid var(--card-border); padding-bottom: 1px;
  transition: color .2s ease, border-color .2s ease;
}
.lk-yc .yc-link:hover { color: #E05D00; border-color: rgba(224,93,0,.40); }

/* ============ footer ============ */
.lk-foot {
  margin-top: clamp(40px, 8vh, 72px);
  text-align: center;
  font-size: 12px;
  color: var(--shell-muted);
}
.lk-foot .mono { font-family: var(--mono); }
.lk-foot a.mono { color: inherit; text-decoration: none; cursor: pointer; }
.lk-foot a.mono:hover { opacity: .6; }

/* ============ dark mode shell tokens ============ */
[data-tone="dark"] {
  --shell-fg: #F3F4F8;
  --shell-muted: #99A0AE;
  --card-bg: rgba(22,25,33,0.52);
  --card-bg-hi: rgba(30,34,45,0.72);
  --card-border: rgba(255,255,255,0.10);
  --tile-bg: rgba(255,255,255,0.96);
  --tile-border: rgba(255,255,255,0.14);
}
[data-tone="dark"] .lk-pill { background: rgba(255,255,255,0.06); }
[data-tone="dark"] .lk-logo .mono-mark { color: #15161A; }

/* ============ theme switcher (fixed top-right) ============ */
.tw { position: fixed; top: 18px; right: 18px; z-index: 20; }
.tw-btn {
  width: 46px; height: 46px; border-radius: 50%; cursor: pointer;
  display: grid; place-items: center; color: var(--shell-fg);
  background: var(--card-bg-hi); border: 1px solid var(--card-border);
  box-shadow: 0 8px 24px -12px rgba(17,18,22,.5);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  transition: transform .25s cubic-bezier(.2,.7,.2,1), border-color .25s ease;
}
.tw-btn:hover { transform: translateY(-1px) rotate(-12deg); border-color: color-mix(in oklab, var(--accent) 45%, var(--card-border)); }
.tw-btn svg { width: 21px; height: 21px; }

.tw-panel {
  position: absolute; top: 56px; right: 0; width: 286px;
  padding: 14px; border-radius: 18px;
  background: var(--card-bg-hi); border: 1px solid var(--card-border);
  box-shadow: 0 24px 60px -28px rgba(17,18,22,.65);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  transform-origin: top right;
  transition: opacity .2s ease, transform .2s cubic-bezier(.2,.7,.2,1);
}
.tw-panel[hidden] { display: block; opacity: 0; transform: scale(.94) translateY(-6px); pointer-events: none; }
.tw-title {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--shell-muted); margin: 2px 2px 12px;
}
.tw-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.tw-item { display: flex; flex-direction: column; gap: 6px; padding: 5px; border: 0; background: none; cursor: pointer; border-radius: 11px; text-align: left; }
.tw-item:hover .sw { transform: translateY(-1px); }
.tw-item .sw {
  height: 46px; border-radius: 10px; border: 1px solid rgba(17,18,22,.12);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.05); position: relative; overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.tw-item.on .sw { box-shadow: 0 0 0 2px var(--accent), 0 0 0 4px color-mix(in oklab, var(--accent) 25%, transparent); }
.tw-item .nm { font-size: 11px; font-weight: 500; color: var(--shell-fg); letter-spacing: .005em; }
.tw-item.on .nm { color: var(--accent); }

@media (max-width: 460px) {
  .tw-panel { width: 248px; }
  .tw { top: 12px; right: 12px; }
}

/* ============ scene primitives ============ */
.layer { position: absolute; inset: 0; will-change: transform; }

/* clouds — fluffy (used by sunny clouds) */
.sun-sunny {
  position: absolute; top: 6%; right: 12%; width: 160px; height: 160px; border-radius: 50%;
  background: radial-gradient(circle, #fffef6 0%, #fff4cf 38%, rgba(255,236,176,0) 72%);
  box-shadow: 0 0 90px 40px rgba(255,244,205,.55);
  animation: sunPulse 9s ease-in-out infinite;
}
.sun-sunny::after {
  content: ""; position: absolute; inset: -120px; border-radius: 50%;
  background: radial-gradient(circle, rgba(255,247,214,.40), transparent 60%);
}
.cloud-f {
  position: absolute; width: var(--w, 360px); height: calc(var(--w, 360px) * .46);
  opacity: var(--o, 1);
  animation: drift var(--d, 90s) linear infinite; animation-delay: var(--delay, 0s);
  filter: url(#fluff) drop-shadow(0 22px 26px rgba(70,110,160,.20));
}
.cloud-f::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 70%, #fff 0 26%, transparent 28%),
    radial-gradient(circle at 38% 52%, #fff 0 30%, transparent 32%),
    radial-gradient(circle at 55% 64%, #fff 0 28%, transparent 30%),
    radial-gradient(circle at 50% 40%, #fdfeff 0 34%, transparent 36%),
    radial-gradient(circle at 72% 58%, #fff 0 27%, transparent 29%),
    radial-gradient(circle at 85% 70%, #f4f9ff 0 22%, transparent 24%),
    radial-gradient(circle at 50% 82%, #eef5fd 0 40%, transparent 42%);
}
.cloud-f::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0) 40%, rgba(150,180,215,.18) 100%);
  mix-blend-mode: multiply;
}

/* clouds — soft blurred (used by daydream) */
.sun-day {
  position: absolute; top: 8%; left: 50%; width: 340px; height: 340px; transform: translateX(-50%);
  background: radial-gradient(circle, rgba(255,255,255,.95), rgba(255,247,220,.5) 35%, transparent 70%);
  filter: blur(4px);
}
.cloud-s {
  position: absolute; width: var(--w, 300px); height: calc(var(--w, 300px) * .34);
  background:
    radial-gradient(circle at 22% 62%, #fff 0 42%, transparent 44%),
    radial-gradient(circle at 48% 38%, #fff 0 48%, transparent 50%),
    radial-gradient(circle at 72% 60%, #fff 0 40%, transparent 42%),
    radial-gradient(circle at 50% 78%, #fff 0 55%, transparent 57%);
  filter: blur(5px) drop-shadow(0 18px 22px rgba(120,150,200,.22));
  opacity: var(--o, .95);
  animation: drift var(--d, 80s) linear infinite;
}

/* dev grid */
.s-grid {
  position: absolute; inset: -2px; will-change: background-position;
  background-image: linear-gradient(rgba(47,111,235,.10) 1px, transparent 1px), linear-gradient(90deg, rgba(47,111,235,.10) 1px, transparent 1px);
  background-size: 38px 38px;
}
.s-grid.fine {
  background-image: radial-gradient(rgba(17,17,17,.08) 1px, transparent 1.4px);
  background-size: 19px 19px; opacity: .8;
}
.s-glow {
  position: absolute; left: 50%; top: 0; width: 80vw; height: 80vw; transform: translate(-50%, -30%);
  background: radial-gradient(circle, rgba(47,111,235,.16), transparent 60%); will-change: transform;
}
.s-mask { position: absolute; inset: 0; background: radial-gradient(120% 80% at 50% 0%, transparent 30%, #f7f8fa 92%); }

/* mountains / ridges */
.range { position: absolute; left: 0; right: 0; bottom: 0; width: 100%; will-change: transform; }
.range svg { display: block; width: 100%; height: auto; }

/* sketchbook */
.sb-paper {
  position: absolute; inset: 0; opacity: .55;
  background-image: linear-gradient(rgba(40,50,70,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(40,50,70,.06) 1px, transparent 1px);
  background-size: 32px 32px;
}
.sb-svg { position: absolute; inset: 0; width: 100%; height: 100%; will-change: transform; }
.sb-svg .shape {
  fill: none; stroke: #2F6FEB; stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: var(--len, 1000); stroke-dashoffset: var(--len, 1000);
  animation: sbDraw var(--d, 5s) cubic-bezier(.4,.05,.2,.95) infinite;
  animation-delay: var(--dl, 0s);
}
.sb-svg .shape.dim { stroke: #9aa6b8; stroke-width: 1.2; }
.sb-svg .ink {
  fill: #2F6FEB; opacity: 0;
  animation: sbInk var(--d, 5s) ease-in-out infinite;
  animation-delay: var(--dl, 0s);
}

/* math */
.mt-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(40,50,70,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(40,50,70,.05) 1px, transparent 1px);
  background-size: 48px 48px;
}
.mt-svg { position: absolute; inset: 0; width: 100%; height: 100%; will-change: transform; }
.mt-svg .axis { stroke: #7a8294; stroke-width: 1; fill: none; }
.mt-svg .curve {
  fill: none; stroke: #dc2626; stroke-width: 2.2; stroke-linecap: round;
  stroke-dasharray: var(--len, 2200); stroke-dashoffset: var(--len, 2200);
  animation: mtDraw var(--d, 6s) cubic-bezier(.4,.05,.2,.95) infinite;
  animation-delay: var(--dl, 0s);
}
.mt-svg .curve.sine { stroke: #2F6FEB; stroke-width: 1.6; }
.mt-eq {
  position: absolute;
  font-family: 'Iowan Old Style', 'Charter', Georgia, serif; font-style: italic;
  color: rgba(40,50,70,.45); user-select: none; will-change: transform, opacity;
  animation: mtFloat var(--d, 12s) ease-in-out infinite;
  animation-delay: var(--dl, 0s);
}

/* ============ keyframes ============ */
@keyframes drift { from { transform: translateX(-50vw); } to { transform: translateX(135vw); } }
@keyframes sunPulse { 0%, 100% { filter: brightness(1); } 50% { filter: brightness(1.08); } }

@keyframes sbDraw {
  0%  { stroke-dashoffset: var(--len, 1000); opacity: 1; }
  55% { stroke-dashoffset: 0; opacity: 1; }
  78% { stroke-dashoffset: 0; opacity: 1; }
  92% { stroke-dashoffset: 0; opacity: 0; }
  100%{ stroke-dashoffset: var(--len, 1000); opacity: 0; }
}
@keyframes sbInk { 0%, 60% { opacity: 0; } 70%, 85% { opacity: .55; } 95%, 100% { opacity: 0; } }

@keyframes mtDraw {
  0%  { stroke-dashoffset: var(--len, 2200); opacity: 1; }
  55% { stroke-dashoffset: 0; opacity: 1; }
  85% { stroke-dashoffset: 0; opacity: .9; }
  100%{ stroke-dashoffset: 0; opacity: 0; }
}
@keyframes mtFloat {
  0%          { transform: translateY(8px); opacity: 0; }
  20%, 80%    { opacity: .55; }
  50%         { transform: translateY(-8px); }
  100%        { transform: translateY(8px); opacity: 0; }
}

/* ============ reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  .cloud-f, .cloud-s, .sun-sunny,
  .sb-svg .shape, .mt-svg .curve, .mt-eq { animation: none; }
  .lk-link { transition: none; opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}