/* ═══════════════════════════════════════════════
   Bhavik Thakkar — portfolio
   Self-hosted variable fonts
   ═══════════════════════════════════════════════ */
@font-face {
  font-family: "Instrument Sans";
  src: url("/assets/fonts/instrument-sans-var-latin.woff2") format("woff2-variations");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-var-latin.woff2") format("woff2-variations");
  font-weight: 400 500;
  font-style: normal;
  font-display: swap;
}

/* ═══════════ tokens ═══════════ */
:root {
  --bg:          #08080a;
  --bg-1:        #0c0c0f;
  --bg-2:        #101014;
  --line:        rgba(255,255,255,.07);
  --line-2:      rgba(255,255,255,.145);
  --line-3:      rgba(255,255,255,.26);
  --text:        #f4f4f2;
  --muted:       #a2a29c;
  --faint:       #7c7b73;

  --accent:      #7c89ff;
  --t-ai:        #7c89ff;
  --t-sys:       #4fd6c0;
  --t-sec:       #efa649;
  --t-bc:        #b98bff;
  --tone:        var(--accent);

  --font-sans: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-display: clamp(2.5rem, 5.2vw, 4.5rem);
  --fs-h2:      clamp(1.85rem, 3.1vw, 2.85rem);
  --fs-h3:      clamp(1.1rem, 1.5vw, 1.35rem);
  --fs-body:    clamp(0.975rem, 0.3vw + 0.92rem, 1.05rem);
  --fs-mono:    0.7rem;

  --gutter: clamp(20px, 4.6vw, 68px);
  --section-y: clamp(80px, 9vw, 150px);
  --radius: 8px;
  --radius-sm: 5px;
  --header-h: 68px;

  --ease: cubic-bezier(.22,.61,.36,1);
  --spring: cubic-bezier(.2,.9,.28,1.06);
  --dur: 260ms;
}

/* ═══════════ base ═══════════ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.65;
  letter-spacing: -0.003em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; padding: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }
::selection { background: var(--accent); color: #07070a; }

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

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

.skip-link {
  position: fixed; top: 10px; left: 10px; z-index: 300;
  transform: translateY(-200%);
  background: var(--text); color: var(--bg);
  padding: 10px 16px; border-radius: var(--radius-sm);
  font-family: var(--font-mono); font-size: var(--fs-mono);
  text-transform: uppercase; letter-spacing: .1em;
}
.skip-link:focus { transform: translateY(0); }

.shell {
  width: 100%; max-width: 1320px; margin-inline: auto;
  padding-inline: var(--gutter);
}

/* shared display type — word-spacing guarantees gaps at every size */
.hero-title, .section-title, .contact-title, .profile-statement, .canvas-title, .case-title {
  font-weight: 600;
  letter-spacing: -0.022em;
  word-spacing: 0.045em;
  line-height: 1.06;
  text-wrap: balance;
}

.eyebrow, .section-tag, .canvas-eyebrow, .arch-label, .index-label,
.gs-label, .tl-period, .tl-org, .hero-kicker, .footer-inner, .ir-year {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: .14em;
  word-spacing: .06em;
}

/* ═══════════ reveal ═══════════ */
.reveal {
  opacity: 0; transform: translateY(16px);
  transition: opacity 640ms var(--ease), transform 640ms var(--ease);
  transition-delay: var(--d, 0ms);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ═══════════ progress + header ═══════════ */
.progress {
  position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 120; pointer-events: none;
}
.progress span { display: block; height: 100%; width: 0; background: var(--accent); }

.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 110;
  height: var(--header-h); display: flex; align-items: center;
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-header.is-stuck {
  background: rgba(8,8,10,.72);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom-color: var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 22px; height: 22px; flex: none; border-radius: 6px;
  background: linear-gradient(140deg, var(--t-ai), var(--t-bc) 55%, var(--t-sys));
  box-shadow: 0 0 0 1px rgba(255,255,255,.12) inset;
}
.brand-text { display: grid; gap: 1px; line-height: 1.2; }
.brand-name { font-size: .9rem; font-weight: 600; letter-spacing: -.01em; }
.brand-status {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: .58rem;
  text-transform: uppercase; letter-spacing: .13em; color: var(--faint);
}
.pulse {
  width: 5px; height: 5px; border-radius: 50%; background: var(--t-sys);
  box-shadow: 0 0 0 0 rgba(79,214,192,.5); animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(79,214,192,.45); }
  70%,100% { box-shadow: 0 0 0 7px rgba(79,214,192,0); }
}

.nav-desktop ul { display: flex; gap: 2px; }
.nav-desktop a {
  display: block; padding: 7px 12px; border-radius: var(--radius-sm);
  font-size: .875rem; color: var(--muted);
  transition: color 160ms var(--ease), background 160ms var(--ease);
}
.nav-desktop a:hover { color: var(--text); background: rgba(255,255,255,.05); }
.nav-desktop a[aria-current="true"] { color: var(--text); background: rgba(255,255,255,.07); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.palette-open {
  display: inline-flex; align-items: center; gap: 10px;
  height: 34px; padding: 0 8px 0 12px;
  border: 1px solid var(--line-2); border-radius: var(--radius-sm);
  font-size: .8rem; color: var(--muted);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}
.palette-open:hover { border-color: var(--line-3); color: var(--text); }
.palette-open kbd {
  display: inline-flex; align-items: center; gap: 1px;
  font-family: var(--font-mono); font-size: .62rem; color: var(--faint);
  background: rgba(255,255,255,.06); border-radius: 3px; padding: 3px 5px;
}
.po-mod { font-size: .7rem; line-height: 1; }

.menu-toggle {
  display: none; width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border: 1px solid var(--line-2); border-radius: var(--radius-sm);
}
.menu-bars { display: grid; gap: 5px; width: 17px; }
.menu-bars i { display: block; height: 1.5px; background: var(--text); transition: transform 240ms var(--spring); }
.menu-toggle[aria-expanded="true"] .menu-bars i:first-child { transform: translateY(3.25px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-bars i:last-child { transform: translateY(-3.25px) rotate(-45deg); }

/* ═══════════ mobile nav ═══════════ */
.mobile-nav {
  position: fixed; inset: 0; z-index: 105;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--header-h) + 24px) var(--gutter) 32px;
  background: rgba(8,8,10,.97);
  -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px);
  opacity: 0; transition: opacity 240ms var(--ease);
}
.mobile-nav.is-open { opacity: 1; }
.mobile-nav li { border-bottom: 1px solid var(--line); }
.mobile-nav li:first-child { border-top: 1px solid var(--line); }
.mobile-nav a {
  display: flex; align-items: baseline; gap: 16px; padding: 18px 2px;
  font-size: clamp(1.5rem, 7vw, 2rem); font-weight: 500; letter-spacing: -.02em;
}
.mn-idx { font-family: var(--font-mono); font-size: .66rem; color: var(--accent); }
.mobile-nav-foot {
  display: flex; gap: 22px; margin-top: 44px;
  font-family: var(--font-mono); font-size: var(--fs-mono);
  text-transform: uppercase; letter-spacing: .13em; color: var(--muted);
}
body.nav-open, body.modal-open { overflow: hidden; }

/* ═══════════ buttons ═══════════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 46px; padding-inline: 20px;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  font-size: .89rem; font-weight: 500; white-space: nowrap;
  transition: background 180ms var(--ease), border-color 180ms var(--ease),
              color 180ms var(--ease), transform 220ms var(--spring);
}
.btn-lg { height: 54px; padding-inline: 24px; font-size: .95rem; }
.btn-solid { background: var(--text); color: #08080a; font-weight: 600; }
.btn-solid:hover { background: #fff; }
.btn-line { border-color: var(--line-2); color: var(--text); }
.btn-line:hover { border-color: var(--line-3); background: rgba(255,255,255,.045); }
.btn-quiet { color: var(--muted); padding-inline: 12px; margin-inline-start: -12px; }
.btn-quiet:hover { color: var(--text); background: rgba(255,255,255,.045); }
.btn-arrow { transition: transform 220ms var(--spring); }
.btn:hover .btn-arrow { transform: translateX(3px); }

.link-out { color: var(--muted); transition: color 160ms var(--ease); }
.link-out:hover { color: var(--text); }

/* ═══════════ HERO ═══════════ */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  padding-top: calc(var(--header-h) + clamp(30px, 5vh, 60px));
  padding-bottom: clamp(48px, 7vh, 84px);
  overflow: hidden;
}
.hero-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(120% 80% at 15% 0%, #000 0%, transparent 68%);
  mask-image: radial-gradient(120% 80% at 15% 0%, #000 0%, transparent 68%);
}
.hero-inner {
  position: relative; display: grid; gap: clamp(40px, 5vw, 72px);
  align-items: center;
}

.hero-kicker { color: var(--muted); margin-bottom: clamp(16px, 2.4vh, 24px); }
.hero-title { font-size: var(--fs-display); font-weight: 600; }
/* below the tablet breakpoint the line breaks are left to the browser, so the
   headline never splits a phrase awkwardly on a narrow screen */
.hero-title span { display: inline; }
@media (min-width: 700px) { .hero-title span { display: block; } }
.hero-title em {
  font-style: normal;
  background: linear-gradient(96deg, var(--t-ai), var(--t-bc));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub {
  margin-top: clamp(20px, 2.8vh, 28px);
  max-width: 46ch; color: var(--muted); font-size: 1.05rem;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: clamp(26px, 3.4vh, 36px); }

.hero-facts {
  display: grid; gap: 14px; margin-top: clamp(32px, 4.4vh, 48px);
  padding-top: 22px; border-top: 1px solid var(--line);
}
.hero-facts dt {
  font-family: var(--font-mono); font-size: .62rem; text-transform: uppercase;
  letter-spacing: .15em; color: var(--faint); margin-bottom: 4px;
}
.hero-facts dd { margin: 0; font-size: .93rem; color: var(--text); }

/* ── stack visualisation ── */
.stackviz { position: relative; }
.sv-caption {
  min-height: 1.6em; margin-bottom: 16px;
  font-family: var(--font-mono); font-size: var(--fs-mono);
  text-transform: uppercase; letter-spacing: .13em; word-spacing: .06em;
  color: var(--faint);
  transition: color 200ms var(--ease);
}
.sv-caption.is-live { color: var(--tone); }

.sv-field {
  position: relative;
  display: grid; gap: clamp(14px, 1.8vw, 22px);
  padding: clamp(18px, 2vw, 26px);
  border: 1px solid var(--line); border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 80% 0%, rgba(124,137,255,.05), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,.025), rgba(255,255,255,0));
}
.sv-edges { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.sv-edges path { fill: none; stroke: var(--line-2); stroke-width: 1; transition: stroke 240ms var(--ease), opacity 240ms var(--ease); }
.sv-edges path.is-lit { stroke: var(--tone); opacity: 1; }

.sv-layer {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 92px minmax(0,1fr);
  gap: clamp(10px, 1.4vw, 18px); align-items: center;
  transition: opacity 240ms var(--ease);
}
.sv-domain {
  --tone: var(--accent);
  display: flex; align-items: center; gap: 8px;
  height: 34px; padding-inline: 12px;
  border: 1px solid var(--line-2); border-radius: var(--radius-sm);
  font-family: var(--font-mono); font-size: .68rem;
  text-transform: uppercase; letter-spacing: .12em;
  color: var(--text); background: rgba(255,255,255,.03);
  transition: border-color 200ms var(--ease), color 200ms var(--ease),
              background 200ms var(--ease), transform 260ms var(--spring);
}
.sv-domain::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; flex: none;
  background: var(--tone); transition: box-shadow 240ms var(--ease);
}
.sv-layer[data-tone="ai"]  { --tone: var(--t-ai); }
.sv-layer[data-tone="sys"] { --tone: var(--t-sys); }
.sv-layer[data-tone="sec"] { --tone: var(--t-sec); }
.sv-layer[data-tone="bc"]  { --tone: var(--t-bc); }

.sv-nodes { display: flex; flex-wrap: wrap; gap: 7px; }
.sv-node {
  display: inline-flex; align-items: center;
  padding: 6px 11px;
  border: 1px solid var(--line); border-radius: 100px;
  background: rgba(255,255,255,.02);
  font-family: var(--font-mono); font-size: .655rem;
  letter-spacing: .04em; color: var(--muted);
  transition: color 220ms var(--ease), border-color 220ms var(--ease),
              background 220ms var(--ease), transform 300ms var(--spring);
  will-change: transform;
}

/* active layer */
.sv-field.has-active .sv-layer:not(.is-active) { opacity: .34; }
.sv-layer.is-active .sv-domain {
  border-color: var(--tone); color: var(--tone); background: rgba(255,255,255,.05);
  transform: translateX(2px);
}
.sv-layer.is-active .sv-domain::before { box-shadow: 0 0 12px 1px var(--tone); }
.sv-layer.is-active .sv-node {
  color: var(--text); border-color: var(--line-2); background: rgba(255,255,255,.05);
}
.sv-hint {
  margin-top: 12px; font-family: var(--font-mono); font-size: .6rem;
  letter-spacing: .12em; text-transform: uppercase; color: var(--faint);
}

/* ═══════════ section scaffolding ═══════════ */
.section { padding-block: var(--section-y); position: relative; }
.section::before {
  content: ""; position: absolute; inset: 0 auto auto 0; width: 100%; height: 1px;
  background: var(--line);
}
.section-head { margin-bottom: clamp(40px, 5vw, 68px); }
.section-head-tight { margin-bottom: clamp(30px, 3.4vw, 44px); }
.section-tag {
  display: flex; align-items: center; gap: 13px; color: var(--muted);
  margin-bottom: clamp(16px, 2vw, 22px);
}
.section-tag .idx { color: var(--accent); }
.section-tag .rule { width: 40px; height: 1px; background: var(--line-2); }
.section-title { font-size: var(--fs-h2); max-width: 17ch; }
.section-lede { margin-top: 16px; color: var(--muted); max-width: 54ch; }

/* ═══════════ WORK ═══════════ */
.filters { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: clamp(30px, 3.4vw, 44px); }
.filter {
  display: inline-flex; align-items: center; gap: 7px;
  height: 34px; padding-inline: 13px;
  border: 1px solid var(--line); border-radius: 100px;
  font-family: var(--font-mono); font-size: .66rem;
  text-transform: uppercase; letter-spacing: .11em; color: var(--muted);
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}
.filter:hover { color: var(--text); border-color: var(--line-2); }
.filter.is-active { color: #08080a; background: var(--text); border-color: var(--text); font-weight: 500; }
.filter-count { opacity: .55; font-size: .6rem; }

/* ── project canvases ── */
.canvas {
  --tone: var(--accent);
  position: relative;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.028), rgba(255,255,255,0) 55%);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}
.canvas[data-tone="ai"]  { --tone: var(--t-ai); }
.canvas[data-tone="sys"] { --tone: var(--t-sys); }
.canvas:hover { border-color: var(--line-2); }
.canvas::after {
  content: ""; position: absolute; inset: -1px -1px auto -1px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--tone), transparent);
  opacity: .5;
}
.canvas + .canvas { margin-top: 20px; }
.canvas-lead { margin-bottom: 20px; }

.canvas-head { padding: clamp(24px, 3vw, 44px); }
.canvas-eyebrow {
  display: flex; align-items: center; flex-wrap: wrap; gap: 9px;
  color: var(--muted); margin-bottom: 18px;
}
.ce-star { color: var(--tone); }
.ce-sep { color: var(--line-3); }
.canvas-title { font-size: clamp(2rem, 4.2vw, 3.4rem); }
.canvas-sub {
  margin-top: 8px; font-family: var(--font-mono); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .13em; word-spacing: .06em; color: var(--tone);
}
.canvas-desc { margin-top: 18px; max-width: 62ch; color: var(--muted); }
.canvas-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }

/* ── architecture diagram ── */
.arch {
  padding: clamp(20px, 2.6vw, 34px) clamp(24px, 3vw, 44px) clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,.012);
}
.arch-label { color: var(--faint); margin-bottom: 18px; }
.arch-flow { display: grid; gap: 8px; }
.arch-step { position: relative; }
.arch-step > button {
  position: relative; width: 100%; text-align: left;
  display: flex; align-items: center; gap: 12px;
  padding: 13px 15px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-1);
  font-size: .875rem; color: var(--muted);
  transition: color 200ms var(--ease), border-color 200ms var(--ease),
              background 200ms var(--ease), transform 260ms var(--spring);
}
.as-i {
  font-family: var(--font-mono); font-size: .6rem; letter-spacing: .1em;
  color: var(--faint); transition: color 200ms var(--ease);
}
.as-or { color: var(--line-3); padding-inline: 2px; }
.arch-step > button:hover, .arch-step.is-active > button {
  color: var(--text); border-color: var(--tone); background: var(--bg-2);
}
.arch-step > button:hover .as-i, .arch-step.is-active > button .as-i { color: var(--tone); }

/* connector + travelling pulse */
.arch-step:not(:last-child)::after {
  content: ""; display: block; height: 16px; width: 1px; margin-inline: auto;
  background: linear-gradient(180deg, var(--line-2), var(--line));
  position: relative;
}
.arch-note {
  margin-top: 20px; padding-top: 16px; border-top: 1px dashed var(--line);
  font-size: .87rem; color: var(--muted); min-height: 3.4em;
}
.arch-note.is-live { color: var(--text); }

/* ── editorial index ── */
.index-label { color: var(--faint); margin: clamp(44px, 5vw, 72px) 0 6px; }
.index-list { border-top: 1px solid var(--line); }

.index-row {
  position: relative;
  border-bottom: 1px solid var(--line);
  --tone: var(--accent);
}
.index-row[data-tone="ai"]  { --tone: var(--t-ai); }
.index-row[data-tone="sec"] { --tone: var(--t-sec); }
.index-row[data-tone="bc"]  { --tone: var(--t-bc); }
.index-row::before {
  content: ""; position: absolute; inset: 0 calc(var(--gutter) * -.35);
  background: rgba(255,255,255,.022); opacity: 0; border-radius: 6px;
  transition: opacity 300ms var(--ease); pointer-events: none;
}
.index-row.is-open::before { opacity: 1; }
/* the tone rail only appears once a row is open */
.index-row::after {
  content: ""; position: absolute; left: calc(var(--gutter) * -.35); top: 0; bottom: 0;
  width: 2px; background: var(--tone); opacity: 0; border-radius: 2px;
  transform: scaleY(.4); transform-origin: center;
  transition: opacity 300ms var(--ease), transform 420ms var(--spring);
}
.index-row.is-open::after { opacity: .9; transform: scaleY(1); }

.ir-head {
  position: relative; z-index: 1;
  display: grid; align-items: baseline;
  grid-template-columns: 40px minmax(0,1fr) auto;
  gap: 4px 14px;
  padding: clamp(15px, 1.7vw, 20px) 0;
}
.ir-num {
  font-family: var(--font-mono); font-size: .68rem; color: var(--faint);
  transition: color 260ms var(--ease);
}
.index-row.is-open .ir-num { color: var(--tone); }
.ir-h { font-size: inherit; font-weight: inherit; min-width: 0; }
.ir-title {
  font-size: clamp(1.2rem, 1.9vw, 1.65rem); font-weight: 500; letter-spacing: -.02em;
  word-spacing: .03em; text-align: left; line-height: 1.25; width: 100%;
  transition: color 220ms var(--ease), transform 380ms var(--spring);
}
.index-row.is-open .ir-title { color: var(--tone); transform: translateX(5px); }
.ir-cat {
  font-family: var(--font-mono); font-size: .62rem; text-transform: uppercase;
  letter-spacing: .14em; word-spacing: .06em; color: var(--faint);
  transition: color 260ms var(--ease);
}
.index-row.is-open .ir-cat { color: var(--muted); }
.ir-year { font-family: var(--font-mono); font-size: .62rem; letter-spacing: .1em; color: var(--faint); }

/* expanding panel — max-height keeps this working in every engine */
.ir-panel {
  position: relative; z-index: 1;
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height 460ms var(--ease), opacity 300ms var(--ease);
}
.index-row.is-open .ir-panel { max-height: 560px; opacity: 1; }
.ir-panel-inner { padding: 2px 0 clamp(20px, 2.2vw, 26px) 54px; }
.ir-type {
  font-family: var(--font-mono); font-size: .64rem; text-transform: uppercase;
  letter-spacing: .14em; word-spacing: .06em; color: var(--tone);
}
.ir-desc { margin-top: 12px; max-width: 58ch; color: var(--muted); font-size: .95rem; }
.ir-stack { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 16px; }
.ir-stack li {
  padding: 4px 9px; border: 1px solid var(--line); border-radius: 100px;
  font-family: var(--font-mono); font-size: .615rem; letter-spacing: .05em; color: var(--muted);
}
.ir-actions { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 20px; }
.ir-action {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: .66rem;
  text-transform: uppercase; letter-spacing: .12em; word-spacing: .06em;
  color: var(--muted); padding: 4px 0;
  border-bottom: 1px solid var(--line-2);
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}
.ir-action:hover { color: var(--tone); border-color: var(--tone); }
.ir-action span { transition: transform 220ms var(--spring); }
.ir-action:hover span { transform: translateX(3px); }

.projects-empty {
  padding: 48px 0; text-align: center; color: var(--muted);
  font-family: var(--font-mono); font-size: .8rem;
}

/* ═══════════ EXPERIENCE ═══════════ */
.timeline { border-top: 1px solid var(--line); }
.tl-item {
  position: relative; display: grid; gap: 4px;
  padding-block: clamp(24px, 3vw, 40px);
  border-bottom: 1px solid var(--line);
}
.tl-period { display: flex; align-items: center; gap: 9px; color: var(--muted); }
.tl-live {
  width: 5px; height: 5px; border-radius: 50%; background: var(--t-sys); flex: none;
  box-shadow: 0 0 8px var(--t-sys);
}
.tl-role {
  font-size: clamp(1.2rem, 1.9vw, 1.6rem); font-weight: 500;
  letter-spacing: -.02em; word-spacing: .03em; line-height: 1.25;
}
.tl-org { margin-top: 5px; color: var(--faint); }
.tl-desc { margin-top: 13px; color: var(--muted); max-width: 60ch; font-size: .95rem; }
.tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 15px; }
.tags li {
  padding: 4px 9px; border: 1px solid var(--line); border-radius: 100px;
  font-family: var(--font-mono); font-size: .615rem; letter-spacing: .05em; color: var(--muted);
}
.tl-featured .tl-role::after {
  content: ""; display: inline-block; width: 5px; height: 5px; margin-left: 9px;
  border-radius: 50%; background: var(--t-sec); vertical-align: middle;
}

/* ═══════════ PROFILE ═══════════ */
.profile-layout { display: grid; gap: clamp(32px, 4vw, 72px); }
.profile-statement { font-size: clamp(1.7rem, 3.4vw, 3.1rem); max-width: 15ch; }
.profile-body { color: var(--muted); max-width: 56ch; }
.profile-body + .profile-body { margin-top: 16px; }
.profile-body em { color: var(--text); font-style: italic; }
.profile-facts {
  display: grid; gap: 0; margin-top: clamp(28px, 3vw, 40px);
  border-top: 1px solid var(--line);
}
.profile-facts > div {
  display: grid; gap: 4px; padding: 16px 0; border-bottom: 1px solid var(--line);
}
.profile-facts dt {
  font-family: var(--font-mono); font-size: .62rem; text-transform: uppercase;
  letter-spacing: .14em; color: var(--faint);
}
.profile-facts dd { margin: 0; font-size: .95rem; }
.pf-muted { color: var(--muted); font-size: .87rem; }

/* ═══════════ STACK GRAPH ═══════════ */
.graph { display: grid; gap: clamp(28px, 3vw, 52px); }
.graph-canvas { position: relative; min-width: 0; }
.graph-edges {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; overflow: visible;
}
.graph-edges path {
  fill: none; stroke: var(--line-2); stroke-width: 1;
  transition: stroke 220ms var(--ease), opacity 220ms var(--ease);
}
.graph.has-focus .graph-edges path { opacity: .28; }
.graph-edges path.is-lit { stroke: var(--accent); opacity: 1; }

.graph-tree, .graph-tree ul { display: grid; }
.g-node {
  display: inline-flex; align-items: center; text-align: left;
  padding: 7px 12px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-1);
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .03em;
  color: var(--muted);
  transition: color 200ms var(--ease), border-color 200ms var(--ease),
              background 200ms var(--ease), transform 260ms var(--spring);
}
.g-root { font-size: .74rem; color: var(--text); border-color: var(--line-2); background: var(--bg-2); }
.g-node:hover, .g-item.is-lit > .g-node {
  color: var(--text); border-color: var(--accent); background: var(--bg-2); transform: translateY(-1px);
}
.graph.has-focus .g-item:not(.is-lit) > .g-node { opacity: .34; }

.graph-side { min-width: 0; }
.gs-label { color: var(--faint); margin-bottom: 14px; }
.gs-label-env { margin-top: 34px; }
.gs-chips { display: flex; flex-wrap: wrap; gap: 7px; }
.gs-chips button {
  padding: 7px 12px; border: 1px solid var(--line); border-radius: 100px;
  font-size: .8rem; color: var(--muted);
  transition: color 200ms var(--ease), border-color 200ms var(--ease),
              background 200ms var(--ease), opacity 200ms var(--ease);
}
.gs-chips button:hover { color: var(--text); border-color: var(--line-2); }
.graph.has-focus .gs-chips button { opacity: .3; }
.graph.has-focus .gs-chips button.is-lit {
  opacity: 1; color: #08080a; background: var(--text); border-color: var(--text);
}
.gs-env { display: flex; flex-wrap: wrap; gap: 5px; }
.gs-env li {
  padding: 4px 9px; border: 1px solid var(--line); border-radius: 100px;
  font-family: var(--font-mono); font-size: .615rem; color: var(--faint);
}

/* ═══════════ CONTACT ═══════════ */
.section-contact { padding-bottom: clamp(90px, 11vw, 180px); }
.contact-title {
  font-size: clamp(2.8rem, 8.4vw, 7rem); font-weight: 600;
  line-height: .98; margin-top: clamp(16px, 2vw, 26px);
}
.contact-title span { display: block; }
.ct-accent {
  background: linear-gradient(94deg, var(--t-ai), var(--t-bc) 60%, var(--t-sys));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.contact-lede { margin-top: clamp(22px, 2.6vw, 32px); max-width: 46ch; color: var(--muted); }
.contact-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: clamp(26px, 3vw, 38px); }
.contact-actions .btn-solid { font-family: var(--font-mono); font-size: .84rem; letter-spacing: -.01em; }
.contact-links {
  display: grid; margin-top: clamp(40px, 5vw, 64px); border-top: 1px solid var(--line);
}
.contact-links li { border-bottom: 1px solid var(--line); min-width: 0; }
.contact-links a {
  display: flex; align-items: center; gap: 16px; padding: 19px 4px;
  transition: padding-left var(--dur) var(--ease);
}
.contact-links a:hover { padding-left: 12px; }
.cl-label {
  min-width: 104px; font-family: var(--font-mono); font-size: var(--fs-mono);
  text-transform: uppercase; letter-spacing: .14em; color: var(--muted);
  transition: color 180ms var(--ease);
}
.cl-value { font-size: 1rem; }
.cl-arrow { margin-left: auto; color: var(--faint); transition: transform 220ms var(--spring), color 180ms var(--ease); }
.contact-links a:hover .cl-label, .contact-links a:hover .cl-arrow { color: var(--accent); }
.contact-links a:hover .cl-arrow { transform: translate(3px,-3px); }

/* ═══════════ FOOTER ═══════════ */
.site-footer { border-top: 1px solid var(--line); padding-block: clamp(26px, 3vw, 40px); }
.footer-inner {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 26px; color: var(--faint);
}
.footer-brand { color: var(--muted); }
.to-top { margin-left: auto; transition: color 180ms var(--ease); }
.to-top:hover { color: var(--text); }

/* ═══════════ CASE STUDY DIALOG ═══════════ */
.case { position: fixed; inset: 0; z-index: 200; }
.case-backdrop {
  position: absolute; inset: 0; background: rgba(4,4,6,.72);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  opacity: 0; transition: opacity 260ms var(--ease);
}
.case.is-open .case-backdrop { opacity: 1; }
.case-panel {
  position: absolute; inset: 0 0 0 auto;
  width: min(760px, 100%); height: 100%;
  background: var(--bg-1); border-left: 1px solid var(--line-2);
  transform: translateX(3%); opacity: 0;
  transition: transform 380ms var(--spring), opacity 260ms var(--ease);
  display: flex; flex-direction: column;
}
.case.is-open .case-panel { transform: none; opacity: 1; }
.case-close {
  position: absolute; top: 16px; right: 16px; z-index: 2;
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line-2); background: var(--bg-1); color: var(--muted);
  transition: color 180ms var(--ease), border-color 180ms var(--ease), transform 240ms var(--spring);
}
.case-close:hover { color: var(--text); border-color: var(--line-3); transform: rotate(90deg); }
.case-scroll {
  overflow-y: auto; overscroll-behavior: contain;
  padding: clamp(30px, 4vw, 56px) clamp(22px, 4vw, 56px) clamp(60px, 7vw, 90px);
}

.case-eyebrow {
  display: flex; align-items: center; flex-wrap: wrap; gap: 9px;
  font-family: var(--font-mono); font-size: var(--fs-mono);
  text-transform: uppercase; letter-spacing: .13em; word-spacing: .06em;
  color: var(--muted); margin-bottom: 16px; padding-right: 48px;
}
.case-eyebrow .ce-sep { color: var(--line-3); }
.case-title { font-size: clamp(1.9rem, 4vw, 2.9rem); }
.case-sub {
  margin-top: 10px; font-size: 1rem; color: var(--tone, var(--accent));
}
.case-block { margin-top: clamp(28px, 3.4vw, 42px); }
.case-block h3 {
  font-family: var(--font-mono); font-size: var(--fs-mono);
  text-transform: uppercase; letter-spacing: .15em; word-spacing: .06em;
  color: var(--faint); margin-bottom: 12px;
  padding-bottom: 10px; border-bottom: 1px solid var(--line);
}
.case-block p { color: var(--muted); }
.case-block p + p { margin-top: 12px; }
.case-list { display: grid; gap: 10px; }
.case-list li {
  display: grid; grid-template-columns: 16px minmax(0,1fr); gap: 11px;
  color: var(--muted); font-size: .95rem;
}
.case-list li::before {
  content: ""; width: 5px; height: 5px; margin-top: .62em; border-radius: 50%;
  background: var(--tone, var(--accent));
}
.case-steps { display: grid; gap: 7px; counter-reset: cs; }
.case-steps li {
  counter-increment: cs;
  display: grid; grid-template-columns: 30px minmax(0,1fr); gap: 12px; align-items: baseline;
  padding: 11px 13px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-2); font-size: .9rem; color: var(--muted);
}
.case-steps li::before {
  content: "0" counter(cs);
  font-family: var(--font-mono); font-size: .6rem; letter-spacing: .1em; color: var(--tone, var(--accent));
}
.case-steps strong { color: var(--text); font-weight: 500; }
.case-tech { display: flex; flex-wrap: wrap; gap: 6px; }
.case-tech li {
  padding: 6px 11px; border: 1px solid var(--line); border-radius: 100px;
  font-family: var(--font-mono); font-size: .64rem; letter-spacing: .04em; color: var(--muted);
}
.case-repo { margin-top: clamp(30px, 3.4vw, 44px); }

/* ═══════════ COMMAND PALETTE ═══════════ */
.palette { position: fixed; inset: 0; z-index: 220; display: flex; justify-content: center; }
.palette-backdrop {
  position: absolute; inset: 0; background: rgba(4,4,6,.6);
  -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px);
  opacity: 0; transition: opacity 200ms var(--ease);
}
.palette.is-open .palette-backdrop { opacity: 1; }
.palette-box {
  position: relative; z-index: 1;
  width: min(560px, calc(100% - 32px));
  margin-top: min(16vh, 140px); align-self: flex-start;
  background: var(--bg-1); border: 1px solid var(--line-2);
  border-radius: 12px; overflow: hidden;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,.8);
  transform: translateY(-8px) scale(.985); opacity: 0;
  transition: transform 240ms var(--spring), opacity 180ms var(--ease);
}
.palette.is-open .palette-box { transform: none; opacity: 1; }
.palette-input-row {
  display: flex; align-items: center; gap: 11px;
  padding: 14px 16px; border-bottom: 1px solid var(--line);
}
.palette-icon { color: var(--faint); font-size: .9rem; }
.palette-input {
  flex: 1; min-width: 0; background: none; border: 0; color: var(--text);
  font: inherit; font-size: .95rem; outline: none;
}
.palette-input::placeholder { color: var(--faint); }
.palette-esc {
  font-family: var(--font-mono); font-size: .58rem; color: var(--faint);
  border: 1px solid var(--line-2); border-radius: 4px; padding: 3px 6px;
}
.palette-list { max-height: min(48vh, 380px); overflow-y: auto; padding: 6px; }
.palette-list li {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 6px; cursor: pointer;
  font-size: .92rem; color: var(--muted);
}
.palette-list li[aria-selected="true"] { background: rgba(255,255,255,.07); color: var(--text); }
.pl-kind {
  margin-left: auto; font-family: var(--font-mono); font-size: .58rem;
  text-transform: uppercase; letter-spacing: .1em; color: var(--faint);
}
.pl-icon { width: 16px; text-align: center; color: var(--faint); font-size: .8rem; }
.palette-empty { padding: 22px; text-align: center; color: var(--faint); font-size: .88rem; }

/* ═══════════ BREAKPOINTS ═══════════ */
@media (max-width: 979px) {
  .nav-desktop, .palette-open .po-label { display: none; }
  .menu-toggle { display: inline-flex; }
  .palette-open { padding: 0 10px; }
}
@media (max-width: 599px) {
  .palette-open { display: none; }
  .brand-status { display: none; }
}

@media (min-width: 600px) {
  .hero-facts { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 24px; }
  .contact-links { grid-template-columns: repeat(2, minmax(0,1fr)); column-gap: 32px; }
}

@media (min-width: 760px) {
  .ir-head { grid-template-columns: 46px minmax(0,1fr) 132px 58px; gap: 0 22px; align-items: center; }
  .ir-cat { justify-self: start; }
  .ir-year { justify-self: end; }
  .ir-panel-inner { padding-left: 68px; }
  .tl-item { grid-template-columns: 190px minmax(0,1fr); gap: clamp(20px, 3.4vw, 52px); }
  .tl-period { padding-top: .45em; align-self: start; }
}

/* the request-path diagram only goes horizontal when the columns can breathe */
@media (min-width: 940px) {
  .arch-flow {
    grid-auto-flow: column; grid-auto-columns: minmax(0,1fr);
    align-items: stretch; gap: 0;
  }
  .arch-step { display: flex; align-items: stretch; }
  .arch-step > button {
    flex: 1; flex-direction: column; align-items: flex-start;
    justify-content: center; gap: 9px; min-height: 96px;
  }
  .arch-step:not(:last-child)::after {
    content: ""; align-self: center; flex: none;
    width: 26px; height: 1px; margin: 0;
    background: linear-gradient(90deg, var(--line-3), var(--line-2));
  }
  .arch-note { min-height: 2.8em; }
}

@media (min-width: 980px) {
  .graph-side { position: sticky; top: calc(var(--header-h) + 28px); }

  /* headline spans the full width; supporting copy and the visualisation
     share the row beneath it */
  .hero-inner {
    grid-template-columns: minmax(0,1fr) minmax(0,.82fr);
    align-items: start;
    row-gap: clamp(30px, 4vh, 52px);
  }
  .hero-copy { display: contents; }
  .hero-kicker { grid-column: 1 / -1; grid-row: 1; }
  .hero-title  { grid-column: 1 / -1; grid-row: 2; max-width: 20ch; }
  .hero-lower  { grid-column: 1; grid-row: 3; }
  .stackviz    { grid-column: 2; grid-row: 3; align-self: center; }
  .profile-layout { grid-template-columns: minmax(0,1fr) minmax(0,1.1fr); align-items: start; }
  .graph { grid-template-columns: minmax(0,1.55fr) minmax(0,1fr); align-items: start; }
  .canvas-lead .canvas-head { padding-bottom: clamp(20px, 2.4vw, 32px); }
}

@media (min-width: 1200px) {
  .hero-sub { font-size: 1.1rem; }
  .section-lede { font-size: 1.03rem; }
}

/* graph: desktop absolute layout is applied by JS via .is-graph-laid */
.graph-canvas.is-graph-laid .graph-tree { position: relative; display: block; }
.graph-canvas.is-graph-laid .graph-tree ul { display: block; }
.graph-canvas.is-graph-laid .g-item { position: absolute; top: 0; left: 0; }
.graph-canvas.is-graph-laid .g-item > .g-node { white-space: nowrap; }

/* graph: stacked tree fallback (mobile / no JS) */
.graph-canvas:not(.is-graph-laid) .graph-tree { gap: 18px; }
.graph-canvas:not(.is-graph-laid) .graph-tree ul { gap: 6px; margin-top: 6px; padding-left: 18px; border-left: 1px solid var(--line); }
.graph-canvas:not(.is-graph-laid) .g-item { justify-items: start; }
.graph-canvas:not(.is-graph-laid) .graph-edges { display: none; }
.graph-canvas:not(.is-graph-laid) .g-item > .g-node { margin-bottom: 2px; }

/* ═══════════ MOTION PREFERENCES ═══════════ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ═══════════ signature: system state readout ═══════════ */
.sysbar {
  position: fixed; left: var(--gutter); bottom: 22px; z-index: 95;
  display: none; align-items: center; gap: 9px;
  padding: 7px 13px 7px 11px;
  border: 1px solid var(--line); border-radius: 100px;
  background: rgba(8,8,10,.72);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  font-family: var(--font-mono); font-size: .6rem;
  text-transform: uppercase; letter-spacing: .16em; word-spacing: .08em;
  color: var(--muted); pointer-events: none;
  opacity: 0; transform: translateY(6px);
  transition: opacity 400ms var(--ease), transform 400ms var(--ease);
}
.sysbar.is-live { opacity: 1; transform: none; }
.sysbar-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--t-sys); flex: none;
  transition: background 400ms var(--ease);
}
.sysbar span { transition: opacity 200ms var(--ease); }
.sysbar.is-swapping span { opacity: 0; }
@media (min-width: 900px) { .sysbar { display: inline-flex; } }

/* ═══════════ architecture: branch node + flow ═══════════ */
.arch-branch { position: relative; }
.arch-fork { display: grid; gap: 6px; flex: 1; }
.arch-fork button {
  position: relative; width: 100%; text-align: left;
  display: flex; align-items: center; gap: 12px;
  padding: 11px 15px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-1); font-size: .875rem; color: var(--muted);
  transition: color 200ms var(--ease), border-color 200ms var(--ease),
              background 200ms var(--ease), transform 260ms var(--spring);
}
.arch-fork button:hover, .arch-fork button.is-active {
  color: var(--text); border-color: var(--tone); background: var(--bg-2);
}
.as-branch-i {
  position: absolute; top: -18px; left: 2px;
  font-family: var(--font-mono); font-size: .6rem; letter-spacing: .1em; color: var(--faint);
}

/* the note slot carries a kind label plus the description */
.arch-note { display: grid; gap: 5px; }
.an-kind {
  font-family: var(--font-mono); font-size: .6rem; text-transform: uppercase;
  letter-spacing: .16em; word-spacing: .07em; color: var(--tone);
  opacity: 0; transition: opacity 200ms var(--ease);
}
.arch-note.is-live .an-kind { opacity: 1; }
.an-text { transition: opacity 180ms var(--ease); }

/* stages draw themselves in as the diagram enters the viewport */
.arch-step, .arch-fork button { --draw: 1; }
.arch:not(.is-drawn) .arch-step { opacity: 0; transform: translateY(8px); }
.arch.is-drawn .arch-step {
  opacity: 1; transform: none;
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
  transition-delay: calc(var(--i, 0) * 90ms);
}
.arch:not(.is-drawn) .arch-step::after { transform: scaleX(0); }
.arch.is-drawn .arch-step::after {
  transform: none; transform-origin: left;
  transition: transform 420ms var(--ease);
  transition-delay: calc(var(--i, 0) * 90ms + 220ms);
}

/* ═══════════ scroll-linked: hero graph, timeline, graph build ═══════════ */
.sv-field { transform: translateY(calc(var(--hero-p, 0) * -18px)); }
.sv-layer { opacity: calc(1 - var(--hero-p, 0) * 0.35); }

.timeline { position: relative; }
.timeline::before {
  content: ""; position: absolute; left: 0; top: 0; width: 1px; height: 100%;
  background: var(--line-2); opacity: 0;
}
@media (min-width: 760px) {
  .timeline::before { opacity: 1; left: 0; }
  .timeline::after {
    content: ""; position: absolute; left: 0; top: 0; width: 1px;
    height: calc(var(--tl-p, 0) * 100%);
    background: linear-gradient(180deg, var(--t-ai), var(--t-sys));
  }
  .tl-item { padding-left: 22px; }
  .tl-item { grid-template-columns: 190px minmax(0,1fr); }
}

.graph-edges path { stroke-dasharray: var(--len, 0); stroke-dashoffset: var(--len, 0); }
.graph.is-built .graph-edges path {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 700ms var(--ease), stroke 220ms var(--ease), opacity 220ms var(--ease);
  transition-delay: calc(var(--i, 0) * 55ms), 0ms, 0ms;
}
.graph-canvas.is-graph-laid .g-item { opacity: 0; transform: translateY(6px); }
.graph.is-built .graph-canvas.is-graph-laid .g-item {
  opacity: 1; transform: none;
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
  transition-delay: calc(var(--i, 0) * 45ms);
}
.graph.has-focus .graph-canvas.is-graph-laid .g-item:not(.is-lit) { opacity: .34; }

/* pinned selection reads stronger than a passing hover */
.g-item.is-pinned > .g-node { border-color: var(--accent); color: var(--text); background: var(--bg-2); }
.gs-chips button.is-lit { cursor: pointer; }

@media (prefers-reduced-motion: reduce) {
  .arch:not(.is-drawn) .arch-step { opacity: 1; transform: none; }
  .arch:not(.is-drawn) .arch-step::after { transform: none; }
  .graph-canvas.is-graph-laid .g-item { opacity: 1; transform: none; }
  .graph-edges path { stroke-dasharray: none; stroke-dashoffset: 0; }
  .sv-field { transform: none; }
  .sv-layer { opacity: 1; }
  .sysbar { transition: none; }
}