/* ==========================================================================
   Batuhan Gümüş — Portfolio
   Direction: schematic / datasheet. Warm graphite, paper text, amber signal.
   ========================================================================== */

:root {
  --bg: #0E0F0C;
  --bg-2: #121310;
  --surface: #151612;
  --surface-2: #1B1C17;
  --line: rgba(232, 226, 212, 0.09);
  --line-2: rgba(232, 226, 212, 0.17);
  --text: #E8E2D4;
  --muted: #8F8B7D;
  --dim: #5E5B52;
  --amber: #FFB547;
  --amber-soft: rgba(255, 181, 71, 0.1);
  --green: #7BD88F;

  --f-display: 'Instrument Serif', 'Times New Roman', Georgia, serif;
  --f-body: 'Schibsted Grotesk', ui-sans-serif, system-ui, sans-serif;
  --f-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Mono', Consolas, monospace;

  --maxw: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --header-h: 64px;
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);

  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/1.65 var(--f-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
/* blueprint grid, fading out from the top centre so it reads as texture, not wallpaper */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 96px 96px;
  background-position: center top;
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 0%, rgba(0, 0, 0, 0.15) 75%);
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 0%, rgba(0, 0, 0, 0.15) 75%);
}
/* grain */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 100; pointer-events: none;
  opacity: 0.05;
  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='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
em { font-style: italic; }
::selection { background: var(--amber); color: var(--bg); }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 2px; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

.skip-link {
  position: fixed; top: 12px; left: 12px; z-index: 200;
  padding: 10px 14px; background: var(--amber); color: var(--bg);
  font: 500 0.8rem var(--f-mono); transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* ---------- Shared bits ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  height: 46px; padding: 0 20px;
  font: 500 0.78rem/1 var(--f-mono); letter-spacing: 0.06em; text-transform: uppercase;
  border: 1px solid var(--line-2); border-radius: 2px;
  transition: background-color .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
  white-space: nowrap;
}
.btn svg { transition: transform .3s var(--ease); }
.btn:hover svg { transform: translateX(3px); }
.btn-solid { background: var(--amber); color: var(--bg); border-color: var(--amber); }
.btn-solid:hover { background: #FFC56E; }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); }
.btn-ghost:hover svg { transform: translateY(2px); }
.btn-sm { height: 34px; padding: 0 12px; gap: 8px; font-size: 0.7rem; }

.led {
  width: 7px; height: 7px; border-radius: 50%; flex: none;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(123, 216, 143, 0.14), 0 0 12px rgba(123, 216, 143, 0.7);
  animation: blink 2.8s ease-in-out infinite;
}
.led-amber { background: var(--amber); box-shadow: 0 0 0 3px rgba(255, 181, 71, 0.14), 0 0 10px rgba(255, 181, 71, 0.6); }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.45; } }

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  font: 400 0.7rem/1 var(--f-mono); letter-spacing: 0.02em; color: var(--muted);
  padding: 6px 8px; border: 1px solid var(--line-2); border-radius: 2px;
}

.link {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 0.76rem/1 var(--f-mono); letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--amber);
  padding-bottom: 4px; border-bottom: 1px solid rgba(255, 181, 71, 0.35);
  transition: border-color .25s var(--ease);
}
.link svg { transition: transform .3s var(--ease); }
.link:hover { border-color: var(--amber); }
.link:hover svg { transform: translate(2px, -2px); }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 50; height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background-color .35s var(--ease), border-color .35s var(--ease), backdrop-filter .35s;
}
.site-header.is-scrolled {
  background: rgba(14, 15, 12, 0.78);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom-color: var(--line);
}
.header-inner { height: 100%; display: flex; align-items: center; gap: 32px; }

.brand { display: inline-flex; align-items: center; gap: 12px; margin-right: auto; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px;
  font: 500 0.72rem/1 var(--f-mono); letter-spacing: 0.04em; color: var(--amber);
  border: 1px solid var(--line-2); position: relative;
}
.brand-mark::before, .brand-mark::after {
  content: ""; position: absolute; width: 5px; height: 5px; border: 1px solid var(--amber);
}
.brand-mark::before { top: -3px; left: -3px; border-right: 0; border-bottom: 0; }
.brand-mark::after { bottom: -3px; right: -3px; border-left: 0; border-top: 0; }
.brand-name { font: 500 0.78rem/1 var(--f-mono); letter-spacing: 0.04em; color: var(--muted); }

.site-nav { display: flex; gap: 28px; }
.site-nav a {
  position: relative; display: inline-flex; align-items: baseline; gap: 6px;
  font: 500 0.84rem/1 var(--f-body); color: var(--muted);
  padding: 8px 0; transition: color .2s;
}
.site-nav a:hover, .site-nav a.is-active { color: var(--text); }
.site-nav a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--amber);
  transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease);
}
.site-nav a.is-active::after { transform: scaleX(1); }
.nav-num { font: 400 0.64rem/1 var(--f-mono); color: var(--dim); }

.header-actions { display: flex; align-items: center; gap: 16px; }
.lang { display: inline-flex; align-items: center; gap: 6px; font: 500 0.72rem/1 var(--f-mono); color: var(--dim); }
.lang button { padding: 6px 2px; color: var(--dim); transition: color .2s; }
.lang button:hover { color: var(--text); }
.lang button[aria-pressed="true"] { color: var(--amber); }

.menu-toggle { display: none; width: 40px; height: 40px; position: relative; border: 1px solid var(--line-2); border-radius: 2px; }
.menu-toggle span {
  position: absolute; left: 11px; right: 11px; height: 1px; background: var(--text);
  transition: transform .3s var(--ease), top .3s var(--ease);
}
.menu-toggle span:first-child { top: 16px; }
.menu-toggle span:last-child { top: 23px; }
.menu-toggle[aria-expanded="true"] span:first-child { top: 19px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { top: 19px; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  min-height: 100svh;
  padding-top: calc(var(--header-h) + clamp(40px, 8vh, 96px));
  padding-bottom: clamp(40px, 6vh, 72px);
  display: flex; flex-direction: column; justify-content: space-between; gap: clamp(48px, 8vh, 88px);
}

.trace {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none;
  -webkit-mask-image: linear-gradient(100deg, transparent 18%, #000 60%);
  mask-image: linear-gradient(100deg, transparent 18%, #000 60%);
}
.trace path { fill: none; stroke-width: 1.2; stroke-linejoin: round; }
.trace-dim path { stroke: rgba(232, 226, 212, 0.16); }
.trace-lit { stroke: var(--amber); stroke-opacity: 0.55; }
.vias circle { fill: var(--bg); stroke: rgba(232, 226, 212, 0.3); stroke-width: 1.2; }
.vias .via-lit { stroke: var(--amber); }
.js .trace path { stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw 2.2s var(--ease) forwards; animation-delay: calc(0.5s + var(--d)); }
.js .vias { opacity: 0; animation: fade 0.8s ease forwards 2.2s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { to { opacity: 1; } }

.hero-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; align-items: end; }
.hero-copy { grid-column: 1 / span 8; }
.hero-figure { grid-column: 9 / span 4; }

.eyebrow {
  font: 500 0.8rem/1.2 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--amber);
}
.eyebrow i { font-style: normal; color: var(--dim); margin: 0 4px; }

.hero-name {
  margin-top: 14px;
  font: 400 clamp(5rem, 11.5vw, 10.5rem)/0.86 var(--f-display);
  letter-spacing: -0.025em;
}
.hero-name em { padding-left: 0.42em; }
.hero-name .dot { color: var(--amber); }

.hero-lead {
  margin-top: clamp(24px, 4vh, 36px); max-width: 22ch;
  font: 400 clamp(1.6rem, 3vw, 2.35rem)/1.15 var(--f-display);
}
.hero-lead em { color: var(--amber); }
.hero-sub { margin-top: 16px; max-width: 52ch; color: var(--muted); font-size: 1.02rem; }

.hero-actions { margin-top: 32px; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 14px; }
.status {
  display: inline-flex; align-items: center; gap: 10px; margin-left: 10px;
  font: 400 0.74rem/1.3 var(--f-mono); letter-spacing: 0.02em; color: var(--muted);
}

/* portrait frame */
.hero-figure { position: relative; }
.frame { position: relative; padding: 10px; border: 1px solid var(--line-2); background: var(--bg-2); }
.frame::before, .frame::after {
  content: ""; position: absolute; width: 14px; height: 14px; border: 1px solid var(--amber);
}
.frame::before { top: -6px; left: -6px; border-right: 0; border-bottom: 0; }
.frame::after { bottom: -6px; right: -6px; border-left: 0; border-top: 0; }
.media.media-portrait { aspect-ratio: 4 / 5; }
.media-portrait img { object-position: 55% 30%; filter: grayscale(0.2) contrast(1.04) brightness(0.95); }

.dim { position: absolute; font: 400 0.62rem/1 var(--f-mono); letter-spacing: 0.1em; color: var(--dim); }
.dim-x { left: 10px; right: 10px; top: -22px; height: 1px; border-top: 1px solid var(--line-2); }
.dim-x::before, .dim-x::after { content: ""; position: absolute; top: -5px; width: 1px; height: 9px; background: var(--line-2); }
.dim-x::before { left: 0; } .dim-x::after { right: 0; }
.dim-x span { position: absolute; left: 50%; top: -6px; transform: translateX(-50%); padding: 0 8px; background: var(--bg); }
.dim-y { top: 10px; bottom: 10px; right: -22px; width: 1px; border-left: 1px solid var(--line-2); }
.dim-y span { position: absolute; top: 50%; left: -6px; transform: translate(-50%, -50%) rotate(90deg); padding: 0 8px; background: var(--bg); white-space: nowrap; }

.hero-figure figcaption {
  margin-top: 14px; display: flex; gap: 8px;
  font: 400 0.7rem/1.4 var(--f-mono); letter-spacing: 0.04em; color: var(--muted);
}
.hero-figure figcaption span:first-child { color: var(--amber); }

/* spec sheet */
.spec {
  display: grid; grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line-2); border-bottom: 1px solid var(--line);
  background: rgba(14, 15, 12, 0.6);
}
.spec-cell { padding: 20px 20px 22px; border-left: 1px solid var(--line); }
.spec-cell:first-child { border-left: 0; padding-left: 0; }
.spec dt { font: 400 0.66rem/1 var(--f-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); margin-bottom: 12px; }
.spec dd { font: 500 0.95rem/1.35 var(--f-body); }
.spec small { display: block; margin-top: 4px; font: 400 0.8rem/1.4 var(--f-body); color: var(--muted); }

/* hero load sequence */
.js [data-stagger] { animation: rise 0.9s var(--ease) both; animation-delay: calc(0.12s + var(--i) * 0.09s); }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* ---------- Media + placeholders ---------- */
.media { position: relative; overflow: hidden; aspect-ratio: 4 / 3; background: var(--surface-2); }
.media img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease); }
.media.is-empty {
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--surface);
}
.media.is-empty::before {
  /* crosshair */
  content: ""; position: absolute; left: 50%; top: 50%; width: 46px; height: 46px; transform: translate(-50%, -50%);
  background:
    linear-gradient(var(--amber), var(--amber)) center / 1px 100% no-repeat,
    linear-gradient(var(--amber), var(--amber)) center / 100% 1px no-repeat;
  opacity: 0.5;
}
.media.is-empty::after {
  content: attr(data-caption);
  position: absolute; left: 16px; bottom: 14px;
  font: 400 0.66rem/1 var(--f-mono); letter-spacing: 0.12em; color: var(--muted);
}
.media-portrait.is-empty::before { display: none; }
.media-portrait.is-empty::after {
  inset: 0; left: 0; bottom: 0; display: grid; place-items: center;
  font: 400 clamp(5rem, 10vw, 8rem)/1 var(--f-display); font-style: italic; letter-spacing: 0; color: rgba(255, 181, 71, 0.85);
}

/* ---------- Sections ---------- */
.section { padding-block: clamp(88px, 12vw, 160px); border-top: 1px solid var(--line); position: relative; }

.sec-head {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 16px 24px;
  margin-bottom: clamp(48px, 7vw, 88px);
}
.sec-label {
  grid-column: 1 / span 3; padding-top: 0.9em;
  display: flex; gap: 14px; align-items: center;
  font: 400 0.72rem/1 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted);
}
.sec-label span:first-child { color: var(--amber); }
.sec-label::after { content: ""; flex: 1; max-width: 64px; height: 1px; background: var(--line-2); }
.sec-head h2, .contact-title {
  grid-column: 4 / span 9;
  font: 400 clamp(2.5rem, 5.6vw, 4.75rem)/1.02 var(--f-display);
  letter-spacing: -0.015em; text-wrap: balance;
}
.sec-head h2 em, .contact-title em { color: var(--amber); }
.sec-intro { grid-column: 4 / span 6; color: var(--muted); font-size: 1.05rem; }

/* reveal on scroll */
.js .reveal { opacity: 0; transform: translateY(12px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; }
.about-text { grid-column: 4 / span 6; display: grid; gap: 20px; color: var(--muted); font-size: 1.05rem; }
.about-text .lede { color: var(--text); font-size: 1.22rem; line-height: 1.55; }

.principles {
  grid-column: 4 / span 9; margin-top: clamp(40px, 6vw, 72px);
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line-2);
}
.principles li { padding: 28px 28px 8px 0; position: relative; }
.principles li + li { padding-left: 28px; border-left: 1px solid var(--line); }
.principles li:nth-child(2) { transition-delay: .08s; }
.principles li:nth-child(3) { transition-delay: .16s; }
.p-num { font: 400 0.7rem/1 var(--f-mono); color: var(--amber); letter-spacing: 0.1em; }
.principles h3 { margin: 18px 0 10px; font: 400 2rem/1 var(--f-display); }
.principles p { color: var(--muted); font-size: 0.95rem; }

/* ---------- Experience ---------- */
.timeline { position: relative; }
.job {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px;
  position: relative; padding-bottom: clamp(48px, 6vw, 72px);
}
.job:last-child { padding-bottom: 0; }
/* the trace */
.job::before {
  content: ""; position: absolute; top: 14px; bottom: -14px;
  left: calc((100% - 11 * 24px) / 12 * 3 + 3 * 24px - 13px);
  width: 1px; background: var(--line-2);
}
.job:last-child::before { display: none; }
.job-date {
  grid-column: 1 / span 3; padding-top: 6px;
  font: 400 0.76rem/1.3 var(--f-mono); letter-spacing: 0.06em; color: var(--muted); font-variant-numeric: tabular-nums;
}
.ongoing { color: var(--amber); }
.via {
  position: absolute; top: 8px;
  left: calc((100% - 11 * 24px) / 12 * 3 + 3 * 24px - 19px);
  width: 13px; height: 13px; border-radius: 50%;
  border: 1px solid var(--line-2); background: var(--bg);
  box-shadow: 0 0 0 4px var(--bg);
}
.via::after { content: ""; position: absolute; inset: 3px; border-radius: 50%; background: var(--line-2); }
.via-on { border-color: var(--amber); }
.via-on::after { background: var(--amber); box-shadow: 0 0 10px rgba(255, 181, 71, 0.8); }
.job:hover .via { border-color: var(--amber); }

.job-body { grid-column: 4 / span 8; }
.job h3 { font: 400 clamp(1.8rem, 3vw, 2.4rem)/1.05 var(--f-display); }
.job-org { margin-top: 8px; font: 500 0.74rem/1 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber); }
.job ul { margin: 20px 0 22px; display: grid; gap: 10px; color: var(--muted); max-width: 64ch; }
.job ul li { position: relative; padding-left: 24px; }
.job ul li::before { content: ""; position: absolute; left: 0; top: 0.8em; width: 12px; height: 1px; background: var(--dim); }

/* ---------- Projects ---------- */
.card {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  transition: border-color .4s var(--ease), transform .4s var(--ease);
}
/* corner registration marks appear on hover */
.card::after {
  content: ""; position: absolute; inset: -1px; pointer-events: none; opacity: 0; transition: opacity .4s var(--ease);
  --c: var(--amber); --s: 14px;
  background:
    linear-gradient(var(--c), var(--c)) top left / var(--s) 1px,
    linear-gradient(var(--c), var(--c)) top left / 1px var(--s),
    linear-gradient(var(--c), var(--c)) top right / var(--s) 1px,
    linear-gradient(var(--c), var(--c)) top right / 1px var(--s),
    linear-gradient(var(--c), var(--c)) bottom left / var(--s) 1px,
    linear-gradient(var(--c), var(--c)) bottom left / 1px var(--s),
    linear-gradient(var(--c), var(--c)) bottom right / var(--s) 1px,
    linear-gradient(var(--c), var(--c)) bottom right / 1px var(--s);
  background-repeat: no-repeat;
}
.card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.card:hover::after { opacity: 1; }
.card:hover .media img { transform: scale(1.025); }

.card-body { padding: clamp(24px, 3vw, 36px); display: grid; gap: 18px; align-content: start; }
.card-body > p:not(.kicker):not(.tags) { color: var(--muted); }
.card h3 { font: 400 clamp(1.9rem, 3vw, 2.5rem)/1.02 var(--f-display); letter-spacing: -0.01em; }
.kicker { font: 400 0.7rem/1.3 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber); }
.card .link { justify-self: start; margin-top: 4px; }

.card-feature { margin-bottom: 24px; }
.feature-media { display: grid; grid-template-columns: 1.15fr 1fr; border-bottom: 1px solid var(--line); }
.feature-media > .media { aspect-ratio: auto; border-left: 1px solid var(--line); }
.feature-media > .media img { position: absolute; inset: 0; object-position: 50% 62%; }
.feature-body { grid-template-columns: 1.15fr 1fr; gap: clamp(24px, 4vw, 56px); }
.feature-body > div { display: grid; gap: 18px; align-content: start; }
.feature-body > div > p:not(.kicker) { color: var(--muted); max-width: 54ch; }

.specs { display: grid; align-content: start; border-top: 1px solid var(--line-2); }
.specs > div { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.specs dt { font: 400 0.68rem/1.6 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); }
.specs dd { font-size: 0.92rem; }

/* headlight demo */
.demo { background: #0A0B09; display: flex; flex-direction: column; }
.demo-bar, .demo-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; }
.demo-bar { font: 400 0.66rem/1 var(--f-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); border-bottom: 1px solid var(--line); }
.demo-live { display: inline-flex; align-items: center; gap: 8px; color: var(--amber); }
.demo-svg { width: 100%; height: auto; flex: 1; }
.demo-svg .horizon { stroke: var(--line-2); stroke-width: 1; }
.demo-svg .road { stroke: rgba(232, 226, 212, 0.2); stroke-width: 1; fill: none; }
.demo-svg .lane { stroke: rgba(232, 226, 212, 0.18); stroke-width: 1; stroke-dasharray: 8 10; }
.demo-svg .beam { fill: url(#beam); transition: opacity .18s linear; }
.demo-svg .beam.off { opacity: 0.06; }
.demo-svg .bbox { fill: none; stroke: var(--amber); stroke-width: 1; stroke-dasharray: 3 3; vector-effect: non-scaling-stroke; }
.demo-svg .bbox-label { fill: var(--amber); font: 400 8px var(--f-mono); }
.demo-foot { border-top: 1px solid var(--line); }
.leds { display: grid; grid-template-columns: repeat(12, 1fr); gap: 4px; flex: 1; max-width: 280px; }
.leds i {
  display: block; height: 10px; border-radius: 1px; background: var(--amber);
  box-shadow: 0 0 6px rgba(255, 181, 71, 0.55);
  transition: opacity .18s linear, box-shadow .18s linear;
}
.leds i.off { opacity: 0.12; box-shadow: none; }
.readout { font: 400 0.66rem/1 var(--f-mono); letter-spacing: 0.08em; color: var(--muted); text-transform: uppercase; white-space: nowrap; font-variant-numeric: tabular-nums; }

.proj-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-bottom: 24px; }
.proj-grid .card { display: flex; flex-direction: column; }
.proj-grid .card-body { flex: 1; }
.proj-grid .card-body > .link { align-self: end; }

.topo { width: 100%; height: auto; margin: 4px 0; border: 1px solid var(--line); background: var(--bg-2); padding: 10px; }
.topo-links path { fill: none; stroke: var(--line-2); stroke-width: 1; }
.topo-links .dashed { stroke: var(--amber); stroke-opacity: 0.6; stroke-dasharray: 4 4; }
.topo-nodes rect { fill: var(--surface); stroke: var(--line-2); stroke-width: 1; }
.topo-nodes .hub { stroke: var(--amber); stroke-opacity: 0.6; }
.topo text { font: 400 9px var(--f-mono); letter-spacing: 0.06em; text-anchor: middle; fill: var(--text); }
.topo-labels text { fill: var(--amber); text-anchor: start; }
.topo-vias circle { fill: var(--bg-2); stroke: var(--amber); stroke-width: 1; }

.card-wide .feature-body > div > p:not(.kicker) { color: var(--muted); max-width: 60ch; }

/* diagram used as a card visual (home lab) */
.media-diagram {
  display: grid; place-items: center; padding: clamp(20px, 4vw, 40px) clamp(16px, 3vw, 32px) 44px;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--bg-2);
}
.media-diagram .topo { border: 0; background: none; padding: 0; margin: 0; }
.media-caption { position: absolute; left: 16px; bottom: 14px; font: 400 0.66rem/1 var(--f-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }

/* ---------- Skills (BOM) ---------- */
.bom { width: 100%; border-collapse: collapse; }
.bom thead th {
  text-align: left; font: 400 0.66rem/1 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim);
  padding: 0 16px 14px 0; border-bottom: 1px solid var(--line-2);
}
.bom tbody tr { border-bottom: 1px solid var(--line); transition: background-color .3s var(--ease); }
.bom tbody tr:hover { background: var(--amber-soft); }
.bom td, .bom tbody th { padding: 22px 16px 22px 0; vertical-align: top; text-align: left; }
.bom .ref { width: 8%; font: 400 0.78rem/2.2 var(--f-mono); color: var(--amber); padding-left: 8px; }
.bom tbody th { width: 26%; font: 400 1.6rem/1.15 var(--f-display); }
.bom .parts { display: flex; flex-wrap: wrap; gap: 8px; }
.bom .parts span {
  font-size: 0.9rem; padding: 6px 12px; border: 1px solid var(--line-2); border-radius: 2px; color: var(--text);
  background: var(--bg);
}
.bom .qty { width: 6%; text-align: right; font: 400 0.78rem/2.2 var(--f-mono); color: var(--muted); padding-right: 8px; }
.bom thead .qty { line-height: 1; }

/* ---------- Contact ---------- */
.contact .sec-head { margin-bottom: 32px; }
.contact-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; align-items: end; }
.contact-grid > div { grid-column: 1 / span 6; }
.contact-title { font-size: clamp(3.2rem, 8.5vw, 7.5rem); line-height: 0.92; }
.contact-text { margin-top: 24px; max-width: 42ch; color: var(--muted); font-size: 1.05rem; }

.contact-list { grid-column: 8 / span 5; border-top: 1px solid var(--line-2); }
.contact-list li {
  display: grid; grid-template-columns: 92px 1fr auto; align-items: center; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
.c-label { font: 400 0.68rem/1 var(--f-mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); }
.c-value { font-size: 1rem; overflow-wrap: anywhere; transition: color .2s; }
.c-value:hover { color: var(--amber); }
.c-arrow { color: var(--dim); font-size: 0.9rem; transition: color .2s, transform .3s var(--ease); }
.contact-list li:hover .c-arrow { color: var(--amber); transform: translate(2px, -2px); }
.copy {
  font: 500 0.66rem/1 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted);
  padding: 7px 10px; border: 1px solid var(--line-2); border-radius: 2px; transition: color .2s, border-color .2s;
}
.copy:hover { color: var(--amber); border-color: var(--amber); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding-block: 28px; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; font: 400 0.7rem/1.4 var(--f-mono); letter-spacing: 0.06em; color: var(--muted); }
.to-top:hover { color: var(--amber); }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 24px; z-index: 120;
  transform: translate(-50%, 16px); opacity: 0; pointer-events: none;
  padding: 12px 16px; background: var(--surface-2); border: 1px solid var(--amber);
  font: 500 0.72rem/1 var(--f-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--amber);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1080px) {
  .site-nav { gap: 20px; }
  .nav-num { display: none; }
  .brand-name { display: none; }
  .spec { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .spec-cell:nth-child(4) { border-left: 0; padding-left: 0; }
  .spec-cell:nth-child(n+4) { border-top: 1px solid var(--line); }
}

@media (max-width: 900px) {
  :root { --header-h: 60px; }
  .menu-toggle { display: block; }
  .site-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; gap: 0; padding: 8px var(--gutter) 24px;
    background: rgba(14, 15, 12, 0.97); border-bottom: 1px solid var(--line);
    -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
  }
  .menu-open .site-nav { opacity: 1; visibility: visible; transform: none; }
  .menu-open .site-header { background: rgba(14, 15, 12, 0.97); border-bottom-color: var(--line); }
  .site-nav a { padding: 16px 0; font-size: 1.05rem; border-bottom: 1px solid var(--line); }
  .site-nav a::after { display: none; }
  .nav-num { display: inline; }

  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero-copy, .hero-figure { grid-column: auto; }
  .hero-figure { max-width: 340px; margin-right: 26px; }
  .trace { -webkit-mask-image: linear-gradient(180deg, transparent 10%, #000 70%); mask-image: linear-gradient(180deg, transparent 10%, #000 70%); }

  .sec-head { grid-template-columns: 1fr; }
  .sec-label, .sec-head h2, .sec-intro { grid-column: auto; }
  .sec-label { padding-top: 0; }

  .about-grid { grid-template-columns: 1fr; }
  .about-text, .principles { grid-column: auto; }
  .principles { grid-template-columns: 1fr; }
  .principles li, .principles li + li { padding: 24px 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .principles li { transition-delay: 0s !important; }

  .job { grid-template-columns: 1fr; gap: 10px; padding-left: 36px; }
  .job::before { left: 6px; top: 20px; bottom: -8px; }
  .via { left: 0; top: 4px; }
  .job-date, .job-body { grid-column: auto; padding-top: 0; }

  .feature-media { grid-template-columns: 1fr; }
  .feature-media > .media { aspect-ratio: 16 / 10; min-height: 0; border-left: 0; border-top: 1px solid var(--line); }
  .feature-body { grid-template-columns: 1fr; }
  .proj-grid { grid-template-columns: 1fr; }

  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .contact-grid > div, .contact-list { grid-column: auto; }
}

@media (max-width: 640px) {
  .header-actions .btn-sm { display: none; }
  .hide-sm { display: none; }
  .hero-name em { padding-left: 0.25em; }
  .status { margin-left: 0; width: 100%; margin-top: 8px; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }

  .spec { grid-template-columns: 1fr 1fr; }
  .spec-cell, .spec-cell:first-child { padding: 16px 14px 18px 0; border-left: 0; border-top: 1px solid var(--line); }
  .spec-cell:nth-child(-n+2) { border-top: 0; }
  .spec-cell:nth-child(even) { padding-left: 14px; border-left: 1px solid var(--line); }
  .spec-cell:last-child { grid-column: 1 / -1; }
  .spec-cell:nth-child(4) { border-left: 1px solid var(--line); padding-left: 14px; }

  .specs > div { grid-template-columns: 1fr; gap: 4px; }
  .demo-foot { flex-direction: column; align-items: stretch; }
  .leds { max-width: none; }

  .bom thead { display: none; }
  .bom, .bom tbody, .bom tr { display: block; }
  .bom tbody tr { display: grid; grid-template-columns: auto 1fr auto; gap: 6px 14px; padding: 20px 0; }
  .bom td, .bom tbody th { padding: 0; width: auto !important; }
  .bom .ref { padding-left: 0; line-height: 2; }
  .bom tbody th { font-size: 1.4rem; }
  .bom .qty { line-height: 2; padding-right: 0; }
  .bom .parts { grid-column: 1 / -1; margin-top: 8px; }
  .bom .parts span { font-size: 0.85rem; padding: 5px 10px; }

  .contact-list li { grid-template-columns: 1fr auto; gap: 6px 12px; }
  .c-label { grid-column: 1 / -1; }
  .footer-inner { flex-direction: column; }
}

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .js .trace path { stroke-dashoffset: 0; }
  .js .vias { opacity: 1; }
}