/* ==========================================================
   Design tokens: colours, type, spacing and theme settings
   ========================================================== */
:root {
  --bg: #ffffff;
  --surface: #f5f5f4;
  --ink: #0a0a0a;
  --muted: #565656;
  --line: #dcdcda;
  --accent: #1f3bff;        /* electric blue; 7:1 on white */
  --on-accent: #ffffff;

  --font: "Helvetica Neue", Helvetica, "Segoe UI", Arial, system-ui, sans-serif;
  --gutter: clamp(1.25rem, 5vw, 3rem);
  --section: clamp(4.5rem, 11vw, 8rem);
  --max: 76rem;
  --radius: 0.5rem;

  /* Type scale: one rhythm used everywhere */
  --fs-display: clamp(2.25rem, 5.4vw, 4rem);   /* h1 */
  --fs-title: clamp(1.5rem, 2.6vw, 2rem);      /* section statements, contact */
  --fs-lead: clamp(1.0625rem, 1.5vw, 1.1875rem);/* intro and body copy */
  --fs-small: 0.9375rem;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #0a0a0a;
  --surface: #151515;
  --ink: #f4f4f2;
  --muted: #a3a3a3;
  --line: #2b2b2b;
  --accent: #7d92ff;        /* lighter blue; 6.8:1 on #0a0a0a */
  --on-accent: #0a0a0a;
  color-scheme: dark;
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1rem/1.6 var(--font); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
h1, h2, h3, h4, p, ul, dl, dd, figure { margin: 0; }
ul { padding: 0; list-style: none; }
a { color: inherit; text-underline-offset: 0.2em; }
[hidden] { display: none !important; }
::selection { background: var(--accent); color: var(--on-accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.wrap { width: min(100% - 2 * var(--gutter), var(--max)); margin-inline: auto; }
.skip { position: absolute; left: var(--gutter); top: -4rem; z-index: 30; background: var(--ink); color: var(--bg); padding: 0.6rem 1rem; border-radius: var(--radius); }
.skip:focus { top: 0.75rem; }
.muted { color: var(--muted); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--bg); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; gap: 1rem 1.5rem; min-height: 4rem; }
.brand { font-weight: 700; letter-spacing: -0.03em; text-decoration: none; margin-right: auto; white-space: nowrap; }
.nav ul { display: flex; gap: 2rem; }
.nav a { text-decoration: none; font-size: 0.9375rem; color: var(--muted); transition: color 0.2s; }
.nav a:hover, .nav a[aria-current="true"] { color: var(--ink); }
.controls { display: flex; align-items: center; gap: 0.5rem; }
.ctl { display: inline-flex; align-items: center; justify-content: center; min-width: 2.5rem; min-height: 2.5rem; padding: 0 0.7rem; border: 1px solid var(--line); border-radius: 999px; background: none; color: var(--ink); font: 600 0.8125rem/1 var(--font); letter-spacing: 0.02em; cursor: pointer; transition: border-color 0.2s, color 0.2s; }
.ctl:hover { border-color: var(--ink); }
.menu-btn { display: none; font-size: 0.875rem; font-weight: 500; letter-spacing: 0; }
.i-sun { display: none; }
[data-theme="dark"] .i-sun { display: block; }
[data-theme="dark"] .i-moon { display: none; }

@media (max-width: 47.99rem) {
  .menu-btn { display: inline-flex; }
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--line); }
  .js .nav.open { display: block; }
  .nav ul { flex-direction: column; gap: 0; width: min(100% - 2 * var(--gutter), var(--max)); margin: 0 auto; padding-block: 0.5rem 1.25rem; }
  .nav a { display: block; padding: 0.75rem 0; font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; color: var(--ink); }
  .no-js .nav { display: block; position: static; }
  .no-js .menu-btn { display: none; }
}

/* Hero */
.hero { padding-block: clamp(3rem, 9vw, 7rem) clamp(3rem, 8vw, 6rem); }
.hero__grid { display: grid; gap: 2.5rem; align-items: center; }
.status { display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.9375rem; color: var(--muted); }
.dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--accent); }
.hero h1 { margin-block: 1.25rem 1.5rem; max-width: 18ch; font-size: var(--fs-display); font-weight: 700; line-height: 1.08; letter-spacing: -0.04em; text-wrap: balance; }
.lead { max-width: 34rem; font-size: var(--fs-lead); line-height: 1.65; color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2.25rem; }
.btn { display: inline-flex; align-items: center; min-height: 2.9rem; padding: 0 1.5rem; border: 1px solid var(--ink); border-radius: 999px; font-weight: 500; text-decoration: none; transition: background-color 0.2s, color 0.2s, border-color 0.2s; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn--solid { background: var(--ink); color: var(--bg); }
.btn--solid:hover { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

.portrait { display: grid; gap: 1.25rem; justify-items: start; }
.portrait__frame { position: relative; width: clamp(10rem, 38vw, 17rem); aspect-ratio: 1; border-radius: 50%; overflow: hidden; background: var(--surface); border: 1px solid var(--line); }
.portrait__frame img, .portrait__ph { position: absolute; inset: 0; width: 100%; height: 100%; }
.portrait__frame img { object-fit: cover; }
.portrait__ph { padding: 18%; fill: none; stroke: var(--line); stroke-width: 2; stroke-linecap: round; }
.portrait__frame.has-img .portrait__ph { display: none; }
.id { display: grid; gap: 0.1rem; font-size: 0.9375rem; color: var(--muted); }
.id strong { color: var(--ink); font-weight: 600; }
@media (min-width: 56rem) {
  .hero__grid { grid-template-columns: 1.7fr 1fr; gap: 4rem; }
  .portrait { justify-items: end; text-align: right; }
}

/* Sections */
.section { padding-block: clamp(3.5rem, 8vw, 6rem); border-top: 1px solid var(--line); }
.split { display: grid; gap: 1.5rem 2rem; }
.split__title { font-size: 1.0625rem; font-weight: 600; letter-spacing: -0.01em; }
@media (min-width: 48rem) { .split { grid-template-columns: minmax(9rem, 1fr) 4fr; } }
.statement { max-width: 40rem; font-size: var(--fs-title); font-weight: 600; line-height: 1.25; letter-spacing: -0.02em; text-wrap: balance; }
.lede { max-width: 38rem; font-size: var(--fs-lead); line-height: 1.7; color: var(--muted); }
.lede + .lede { margin-top: 1rem; }
.prose { max-width: 34rem; margin-top: 0.9rem; font-size: var(--fs-lead); color: var(--muted); }
.sub { margin-top: clamp(2.5rem, 6vw, 3.5rem); font-size: var(--fs-small); font-weight: 600; color: var(--muted); }
.principles { display: grid; gap: 1.5rem; margin-top: 1rem; }
.principles li { padding-top: 1rem; border-top: 1px solid var(--ink); }
.principles h4 { margin-bottom: 0.4rem; font-size: 1.125rem; font-weight: 600; letter-spacing: -0.01em; }
.principles p { color: var(--muted); font-size: var(--fs-small); max-width: 22rem; line-height: 1.6; }
@media (min-width: 40rem) { .principles { grid-template-columns: repeat(3, 1fr); gap: 2rem; } }

/* Projects */
.projects { display: grid; gap: 1.5rem; margin-top: clamp(2rem, 5vw, 3rem); grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr)); }
.card { position: relative; display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--bg); transition: border-color 0.25s var(--ease), transform 0.25s var(--ease); }
.card:hover, .card:focus-within { border-color: var(--ink); transform: translateY(-2px); }
.card__img { display: flex; align-items: flex-end; aspect-ratio: 2 / 1; padding: 1.25rem; background: var(--surface); border-bottom: 1px solid var(--line); background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 2.5rem 2.5rem; background-position: -1px -1px; }
.card__domain { padding: 0.35rem 0.7rem; background: var(--bg); border: 1px solid var(--line); border-radius: 999px; font-size: 0.8125rem; color: var(--muted); }
.card__body { display: flex; flex: 1; flex-direction: column; gap: 0.6rem; padding: 1.25rem 1.25rem 1.4rem; }
.card h3 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.025em; }
.card__role { font-size: 0.875rem; color: var(--muted); }
.card__desc { font-size: 0.9375rem; }
.card__link { align-self: flex-start; margin-top: auto; padding-top: 0.75rem; font-weight: 500; text-decoration-color: var(--line); text-decoration-thickness: 0.08em; transition: color 0.2s, text-decoration-color 0.2s; }
.card__link::after { content: ""; position: absolute; inset: 0; } /* whole card is clickable */
.card__link:hover { color: var(--accent); text-decoration-color: var(--accent); }
.card__link:focus-visible { outline: none; }
.card:has(.card__link:focus-visible) { outline: 2px solid var(--accent); outline-offset: 3px; }
.nojs { margin-top: 2rem; }

/* Skills */
.skills { display: grid; gap: 2.25rem 2rem; }
.skills h3 { margin-bottom: 0.75rem; padding-top: 0.9rem; border-top: 1px solid var(--ink); font-size: 1rem; font-weight: 600; }
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tags li { padding: 0.25rem 0.8rem; border: 1px solid var(--line); border-radius: 999px; font-size: 0.875rem; }
@media (min-width: 40rem) { .skills { grid-template-columns: repeat(2, 1fr); } }

/* Contact */
.email { display: inline-block; margin-top: 1.75rem; max-width: 100%; overflow-wrap: anywhere; font-size: clamp(1.25rem, 4vw, 2.25rem); font-weight: 600; line-height: 1.15; letter-spacing: -0.03em; text-decoration: underline; text-decoration-thickness: 0.06em; text-decoration-color: var(--line); transition: color 0.2s, text-decoration-color 0.2s; }
.email:hover { color: var(--accent); text-decoration-color: var(--accent); }
.socials { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }
.socials a { display: inline-flex; align-items: center; gap: 0.6rem; min-height: 2.75rem; padding: 0 1.1rem 0 0.9rem; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-size: 0.9375rem; transition: border-color 0.2s, color 0.2s, transform 0.2s var(--ease); }
.socials a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.socials svg { flex: none; }

/* Footer */
.footer { border-top: 1px solid var(--line); font-size: 0.9375rem; }
.footer__grid { display: grid; gap: 1.75rem; padding-block: 2.5rem; }
.footer p + p { margin-top: 0.15rem; }
.footer a { text-underline-offset: 0.2em; text-decoration-color: var(--line); transition: color 0.2s; }
.footer a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.socials--text { margin-top: 0.5rem; gap: 0.25rem 1.25rem; }
.socials--text a { min-height: 0; padding: 0.3rem 0; border: 0; border-radius: 0; text-decoration: underline; text-decoration-color: var(--line); }
.socials--text a:hover { transform: none; }
.totop { color: var(--muted); text-decoration: none; justify-self: start; }
@media (min-width: 48rem) { .footer__grid { grid-template-columns: 1.4fr 1fr auto; align-items: start; } .totop { justify-self: end; } }

/* Motion: one page-load sequence; hover and press feedback only elsewhere */
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.intro { animation: rise 0.7s var(--ease) both; animation-delay: calc(var(--i, 0) * 80ms); }
@media (prefers-reduced-motion: reduce) {
  .intro { animation: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
  .card:hover, .card:focus-within, .socials a:hover { transform: none; }
}