:root {
  --bg: #f8f7fc;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-solid: #ffffff;
  --text: #191725;
  --muted: #68647a;
  --border: #ded9ef;
  --primary: #7657d8;
  --primary-strong: #5d3fc2;
  --primary-soft: #ebe5ff;
  --accent: #9b83e8;
  --shadow: 0 24px 70px rgba(72, 48, 135, 0.11);
  --radius: 22px;
}

[data-theme="dark"] {
  --bg: #0b0920;
  --surface: rgba(20, 17, 50, 0.88);
  --surface-solid: #15112f;
  --text: #f5f2ff;
  --muted: #bbb5d4;
  --border: #38305f;
  --primary: #b69cff;
  --primary-strong: #c9b8ff;
  --primary-soft: #282047;
  --accent: #8e6ff2;
  --shadow: 0 26px 80px rgba(0, 0, 0, 0.34);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 8%, rgba(167, 139, 250, 0.18), transparent 32rem),
    radial-gradient(circle at 88% 20%, rgba(125, 211, 252, 0.11), transparent 28rem),
    var(--bg);
  line-height: 1.65;
  transition: background-color .25s ease, color .25s ease;
}
a { color: inherit; }
img { max-width: 100%; }
button, input, textarea { font: inherit; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; }

.skip-link {
  position: fixed; left: 1rem; top: -5rem; z-index: 100;
  padding: .7rem 1rem; background: var(--text); color: var(--bg); border-radius: 10px;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(18px);
}
.nav-wrap, .container { width: min(1120px, calc(100% - 2rem)); margin-inline: auto; }
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { font-weight: 760; letter-spacing: -.02em; text-decoration: none; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: .3rem; }
.nav-links a { padding: .5rem .7rem; color: var(--muted); text-decoration: none; border-radius: 10px; font-size: .92rem; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: var(--primary-soft); }
.nav-actions { display: flex; align-items: center; gap: .45rem; }
.icon-button, .menu-button {
  width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 12px;
  color: var(--text); background: var(--surface); cursor: pointer;
}
.menu-button { display: none; }

main { overflow: hidden; }
.hero { padding: clamp(5rem, 10vw, 9rem) 0 5rem; position: relative; }
.hero::after {
  content: ""; position: absolute; width: 430px; height: 210px; right: -90px; top: 70px;
  border: 1px solid rgba(167,139,250,.35); border-radius: 50%; filter: blur(.2px); transform: rotate(-14deg);
}
.eyebrow { color: var(--primary-strong); font-weight: 750; text-transform: uppercase; letter-spacing: .13em; font-size: .77rem; }
h1, h2, h3 { margin: 0; line-height: 1.12; letter-spacing: -.035em; }
h1 { max-width: 860px; font-size: clamp(3rem, 7.6vw, 6.7rem); margin-top: 1rem; }
h2 { font-size: clamp(2rem, 4vw, 3.25rem); }
h3 { font-size: 1.3rem; }
.gradient-text { color: var(--primary); }
.hero-copy { max-width: 700px; margin: 1.5rem 0 0; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); }
.button-row { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  min-height: 46px; padding: .72rem 1rem; border: 1px solid var(--border); border-radius: 13px;
  color: var(--text); background: var(--surface); font-weight: 700; text-decoration: none; cursor: pointer;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-2px); border-color: var(--primary); }
.button.primary { color: white; background: var(--primary-strong); border-color: var(--primary-strong); }
.button.small { min-height: 38px; padding: .48rem .75rem; font-size: .9rem; }

.section { padding: 4.5rem 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 2rem; }
.section-heading p { max-width: 560px; margin: .7rem 0 0; color: var(--muted); }
.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  padding: clamp(1.25rem, 3vw, 2rem); border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); box-shadow: var(--shadow); backdrop-filter: blur(10px);
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--primary) 65%, var(--border)); }
.card p { color: var(--muted); }
.card-link { text-decoration: none; }
.project-card { min-height: 285px; display: flex; flex-direction: column; justify-content: space-between; }
.project-top { display: flex; justify-content: space-between; align-items: start; gap: 1rem; }
.project-number { color: var(--primary); font-weight: 800; font-size: .85rem; }
.tag-list { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1.2rem; }
.tag { padding: .28rem .58rem; border-radius: 999px; background: var(--primary-soft); color: var(--primary-strong); font-size: .8rem; font-weight: 700; }
.link-arrow { margin-top: 1.4rem; color: var(--primary-strong); font-weight: 750; }

.focus-panel { position: relative; overflow: hidden; }
.focus-panel::before { content: ""; position: absolute; inset: auto -80px -110px auto; width: 250px; height: 250px; border-radius: 50%; background: rgba(167,139,250,.15); filter: blur(10px); }
.focus-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.focus-item { padding: 1.2rem; border-radius: 16px; background: color-mix(in srgb, var(--surface-solid) 76%, transparent); }
.focus-item strong { display: block; margin-bottom: .35rem; }
.progress { height: 8px; margin-top: .85rem; border-radius: 999px; overflow: hidden; background: var(--border); }
.progress > span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary), #8ecdf8); }

.page-hero { padding: 5rem 0 2.8rem; }
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 5.2rem); }
.page-hero p { max-width: 720px; color: var(--muted); font-size: 1.12rem; }
.prose { max-width: 770px; }
.prose p, .prose li { color: var(--muted); }
.prose h2 { margin-top: 2.5rem; font-size: 2rem; }
.metric-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.5rem; }
.metric { padding: 1rem; border-top: 2px solid var(--primary); }
.metric strong { display: block; font-size: 1.5rem; }
.metric span { color: var(--muted); font-size: .9rem; }

.skill-card ul, .clean-list { padding-left: 1.1rem; margin-bottom: 0; }
.skill-card li, .clean-list li { margin: .45rem 0; color: var(--muted); }
.status { display: inline-flex; align-items: center; gap: .45rem; color: var(--primary-strong); font-weight: 750; font-size: .9rem; }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 5px var(--primary-soft); }

.architecture { display: grid; gap: .8rem; margin: 1.4rem 0; }
.arch-flow { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .65rem; }
.arch-node { padding: .8rem 1rem; border: 1px solid var(--border); border-radius: 14px; background: var(--surface-solid); font-weight: 750; text-align: center; }
.arch-arrow { color: var(--primary); font-size: 1.4rem; font-weight: 900; }

.timeline { display: grid; gap: 1rem; }
.timeline-item { display: grid; grid-template-columns: 170px 1fr; gap: 1.2rem; padding: 1.4rem 0; border-bottom: 1px solid var(--border); }
.timeline-item time { color: var(--primary-strong); font-weight: 750; }
.timeline-item p { margin: .45rem 0 0; color: var(--muted); }

.contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 1rem; align-items: start; }
.form { display: grid; gap: 1rem; }
.field { display: grid; gap: .4rem; }
.field label { font-weight: 700; }
.field input, .field textarea {
  width: 100%; padding: .85rem .9rem; border: 1px solid var(--border); border-radius: 12px;
  color: var(--text); background: var(--surface-solid);
}
.field textarea { min-height: 150px; resize: vertical; }
.form-note, .form-status { color: var(--muted); font-size: .9rem; }
.honeypot { position: absolute; left: -9999px; }

.footer { padding: 2.2rem 0; margin-top: 4rem; border-top: 1px solid var(--border); color: var(--muted); }
.footer-wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer a { text-decoration: none; }

.reveal { opacity: 0; transform: translateY(18px); }
.reveal.visible { opacity: 1; transform: none; transition: opacity .55s ease, transform .55s ease; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}
@media (max-width: 900px) {
  .menu-button { display: inline-grid; place-items: center; }
  .nav-links { position: absolute; top: 72px; left: 1rem; right: 1rem; display: none; padding: .8rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface-solid); box-shadow: var(--shadow); }
  .nav-links.open { display: grid; }
  .nav-links a { padding: .7rem; }
  .grid.three { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .hero { padding-top: 4rem; }
  .hero::after { display: none; }
  .grid.two, .grid.three, .focus-row, .metric-row { grid-template-columns: 1fr; }
  .section-heading { display: block; }
  .timeline-item { grid-template-columns: 1fr; gap: .4rem; }
  .arch-flow { align-items: stretch; flex-direction: column; }
  .arch-arrow { transform: rotate(90deg); text-align: center; }
}