/* ---------- Theme tokens ---------- */
:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --text: #16181d;
  --text-muted: #5b6270;
  --border: #e5e6e9;
  --accent: #0f766e;
  --accent-hover: #0d5f59;
  --accent-soft: #e6f4f2;
  --on-accent: #ffffff;
  --tag-bg: #f1f2f4;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
  --radius: 14px;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116;
    --surface: #161a21;
    --text: #e8eaee;
    --text-muted: #9aa3b2;
    --border: #262c36;
    --accent: #2dd4bf;
    --accent-hover: #5eead4;
    --accent-soft: #10302d;
    --on-accent: #06201d;
    --tag-bg: #1e232c;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

:root[data-theme="dark"] {
  --bg: #0e1116;
  --surface: #161a21;
  --text: #e8eaee;
  --text-muted: #9aa3b2;
  --border: #262c36;
  --accent: #2dd4bf;
  --accent-hover: #5eead4;
  --accent-soft: #10302d;
  --on-accent: #06201d;
  --tag-bg: #1e232c;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
h1, h2, h3, h4 { line-height: 1.2; margin: 0; letter-spacing: -0.015em; }
p { margin: 0 0 1em; }
code { font-size: .9em; background: var(--tag-bg); padding: .1em .35em; border-radius: 5px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--text-muted); }

.skip-link {
  position: absolute; left: 16px; top: -48px;
  background: var(--accent); color: var(--on-accent);
  padding: 8px 14px; border-radius: 8px; z-index: 100;
}
.skip-link:focus { top: 12px; color: var(--on-accent); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.site-header.scrolled { border-bottom-color: var(--border); }

.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; color: var(--text); font-size: 1.05rem; }
.brand:hover { color: var(--text); }

.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--text-muted); font-size: .95rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); }

.theme-toggle {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--text);
  cursor: pointer;
}
.theme-toggle svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: block; }
}

.nav-toggle { display: none; }

/* ---------- Hero ---------- */
.hero { padding-top: 96px; padding-bottom: 72px; }
.eyebrow {
  display: inline-block;
  font-size: .85rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 20px;
}
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 700; max-width: 18ch; margin-bottom: 24px; }
.hero h1 .muted { font-weight: 600; }
.lead { font-size: 1.15rem; color: var(--text-muted); max-width: 60ch; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 20px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); font-weight: 600; font-size: .95rem;
  transition: border-color .15s, background .15s, transform .15s;
}
.btn:hover { color: var(--text); border-color: var(--text-muted); transform: translateY(-1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }

.social { display: flex; gap: 20px; list-style: none; padding: 0; margin: 28px 0 0; }
.social a { color: var(--text-muted); font-weight: 500; font-size: .95rem; }
.social a:hover { color: var(--accent); }

/* ---------- Sections ---------- */
.section { padding-top: 72px; padding-bottom: 24px; }
.section-title {
  font-size: .85rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em;
  color: var(--text-muted); margin-bottom: 28px;
  display: flex; align-items: center; gap: 16px;
}
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.section-intro { color: var(--text-muted); margin-top: -12px; margin-bottom: 32px; }
.subsection-title { font-size: 1.25rem; margin: 64px 0 20px; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.6fr 1fr; gap: 48px; align-items: start; }
.about-text p { color: var(--text); }
.facts {
  margin: 0; padding: 24px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); display: grid; gap: 16px;
}
.facts dt { font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); }
.facts dd { margin: 2px 0 0; font-weight: 500; }

/* ---------- Projects ---------- */
.projects { display: grid; gap: 32px; }
.project {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 0;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
}
.project:nth-child(even) .project-media { order: 2; }
.project-media { background: var(--media-bg, var(--tag-bg)); display: flex; align-items: center; }
.project-media img { width: 100%; height: auto; aspect-ratio: 2 / 1; }
.project-body { padding: 32px; display: flex; flex-direction: column; }
.project-body h3 { font-size: 1.5rem; margin-bottom: 4px; }
.project-tagline { color: var(--accent); font-weight: 600; margin-bottom: 14px; }
.project-body > p { color: var(--text-muted); }

.highlights { margin: 0 0 20px; padding-left: 0; list-style: none; display: grid; gap: 8px; }
.highlights li { position: relative; padding-left: 20px; font-size: .95rem; }
.highlights li::before {
  content: ""; position: absolute; left: 2px; top: .62em;
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
}

.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0 0 20px; }
.tags li {
  font-size: .8rem; font-weight: 500; padding: 4px 10px; border-radius: 999px;
  background: var(--tag-bg); color: var(--text-muted);
}

.project-link {
  margin-top: auto; align-self: flex-start;
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600;
}
.project-link[data-live="true"]::after { content: "↗"; transition: transform .15s; }
.project-link[data-live="true"]:hover::after { transform: translate(2px, -2px); }
.project-link[data-live="false"] { color: var(--text-muted); pointer-events: none; cursor: default; }
.project-link[data-live="false"]::after {
  content: "Coming soon";
  font-size: .75rem; font-weight: 600; padding: 3px 9px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; display: flex; flex-direction: column;
}
.card h4 { font-size: 1.15rem; margin-bottom: 8px; }
.card-metric { font-size: .9rem; font-weight: 600; color: var(--accent); }
.card p:not(.card-metric) { font-size: .95rem; color: var(--text-muted); }
.card .tags { margin-top: auto; margin-bottom: 0; }

/* ---------- Timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid; grid-template-columns: 200px 1fr; gap: 24px;
  padding: 24px 0; border-top: 1px solid var(--border);
}
.timeline li:first-child { border-top: 0; padding-top: 0; }
.timeline-date { font-weight: 600; color: var(--text-muted); font-size: .95rem; }
.timeline h3 { font-size: 1.15rem; margin-bottom: 8px; }
.timeline .at { font-weight: 500; color: var(--text-muted); }
.timeline p:not(.timeline-date) { color: var(--text-muted); margin: 0; }

/* ---------- Skills ---------- */
.skills { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.skills h3 { font-size: 1rem; margin-bottom: 14px; }
.skills .tags li { font-size: .9rem; padding: 6px 12px; background: var(--surface); border: 1px solid var(--border); color: var(--text); }

/* ---------- Contact & footer ---------- */
.contact { padding-bottom: 96px; }
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; color: var(--text-muted); font-size: .9rem; }
.site-footer p { margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about { grid-template-columns: 1fr; gap: 32px; }
  .project { grid-template-columns: 1fr; }
  .project:nth-child(even) .project-media { order: 0; }
  .cards { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .container { padding: 0 16px; }

  .nav-toggle {
    display: grid; place-content: center; gap: 6px;
    width: 40px; height: 40px; border: 0; background: transparent; cursor: pointer;
  }
  .nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .2s; }
  .nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 8px 16px 16px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 12px 0; font-size: 1rem; }
  .nav-links li:last-child { padding-top: 8px; }

  .hero { padding-top: 56px; padding-bottom: 40px; }
  .section { padding-top: 56px; }
  .project-body { padding: 24px 20px; }
  .cards, .skills { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: 1fr; gap: 6px; }
  .actions .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}