:root {
  --bg: #0b0c10;
  --bg-soft: #121419;
  --bg-card: #15181f;
  --border: #232733;
  --text: #e8eaf0;
  --text-dim: #9aa0ad;
  --text-faint: #6b7280;
  --accent: #7c5cff;
  --accent-2: #4dd6c4;
  --hl: #b9a8ff;
  --shadow: 0 10px 40px -12px rgba(0,0,0,.6);
  --max: 1040px;
}

html[data-theme="light"] {
  --bg: #fbfbfd;
  --bg-soft: #f2f3f7;
  --bg-card: #ffffff;
  --border: #e4e6ed;
  --text: #14161c;
  --text-dim: #565d6b;
  --text-faint: #8b92a0;
  --accent: #6244e6;
  --accent-2: #189c8c;
  --hl: #5a3ff0;
  --shadow: 0 10px 36px -14px rgba(20,22,28,.18);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .4s ease, color .4s ease;
}

a { color: inherit; text-decoration: none; }

/* glowing backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(60vw 50vh at 75% -10%, rgba(124,92,255,.16), transparent 60%),
    radial-gradient(50vw 40vh at 10% 110%, rgba(77,214,196,.12), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

main, .nav, .footer { position: relative; z-index: 1; }

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand { font-weight: 800; font-size: 1.25rem; letter-spacing: -.02em; }
.brand-dot { color: var(--accent); }
.nav-links { margin-left: auto; display: flex; gap: 26px; }
.nav-links a {
  font-size: .92rem; color: var(--text-dim); font-weight: 500;
  transition: color .2s;
}
.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(--bg-card); color: var(--text);
  cursor: pointer; transition: border-color .2s, transform .2s;
}
.theme-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }
.icon-moon { display: none; }
html[data-theme="light"] .icon-sun { display: none; }
html[data-theme="light"] .icon-moon { display: block; }

/* HERO */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 96px 24px 72px;
}
.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: .82rem; color: var(--accent-2);
  letter-spacing: .04em; margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.8rem, 8vw, 5rem);
  font-weight: 800; letter-spacing: -.04em; line-height: 1;
  margin-bottom: 22px;
}
.lede {
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  color: var(--text-dim); max-width: 640px; font-weight: 400;
}
.hl { color: var(--hl); font-weight: 600; }
.hero-cta { display: flex; gap: 14px; margin: 34px 0 44px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center;
  padding: 12px 22px; border-radius: 12px;
  font-weight: 600; font-size: .95rem;
  transition: transform .2s, box-shadow .2s, background .2s, border-color .2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #9a7bff);
  color: #fff; box-shadow: 0 8px 24px -8px var(--accent);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -8px var(--accent); }
.btn-ghost { border: 1px solid var(--border); color: var(--text); background: var(--bg-card); }
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }

.hero-meta {
  list-style: none; display: flex; gap: 38px; flex-wrap: wrap;
  border-top: 1px solid var(--border); padding-top: 26px;
}
.hero-meta li { font-size: .92rem; color: var(--text); }
.hero-meta .k {
  display: block; font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--text-faint);
  text-transform: uppercase; letter-spacing: .08em; margin-bottom: 4px;
}

/* SECTIONS */
.section { max-width: var(--max); margin: 0 auto; padding: 72px 24px; }
.section-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 40px; }
.section-num {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent); font-size: .9rem;
}
.section-head h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); font-weight: 700; letter-spacing: -.02em; }

/* ABOUT */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; }
.about-body p { color: var(--text-dim); margin-bottom: 18px; font-size: 1.05rem; }
.about-body strong { color: var(--text); }
.about-side h3 {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--text-faint); margin-bottom: 14px; font-family: 'JetBrains Mono', monospace;
}
.about-side h3:not(:first-child) { margin-top: 30px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips span {
  font-size: .85rem; padding: 6px 12px; border-radius: 8px;
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text-dim);
}
.lang-list { list-style: none; }
.lang-list li { padding: 5px 0; border-bottom: 1px solid var(--border); font-size: .95rem; }
.lang-list em { color: var(--text-faint); font-style: normal; float: right; font-size: .85rem; }

/* TIMELINE */
.timeline { list-style: none; position: relative; padding-left: 28px; }
.timeline::before {
  content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px;
  width: 2px; background: var(--border);
}
.timeline li { position: relative; margin-bottom: 22px; }
.tl-dot {
  position: absolute; left: -28px; top: 22px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}
.tl-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 22px; box-shadow: var(--shadow);
}
.tl-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.tl-top h3 { font-size: 1.15rem; font-weight: 700; }
.tl-date {
  font-family: 'JetBrains Mono', monospace; font-size: .8rem;
  color: var(--accent-2); white-space: nowrap;
}
.tl-role { color: var(--text); font-weight: 500; margin: 4px 0 8px; }
.tl-desc { color: var(--text-dim); font-size: .96rem; }

.awards { margin-top: 44px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 14px; padding: 24px 26px; }
.awards h3 { font-size: 1rem; margin-bottom: 14px; }
.awards ul { list-style: none; }
.awards li { padding: 8px 0; color: var(--text-dim); border-bottom: 1px solid var(--border); }
.awards li:last-child { border-bottom: none; }
.awards strong { color: var(--text); }

/* PROJECTS */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px; display: flex; flex-direction: column;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.card:not(.card-static):hover {
  transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow);
}
.card-tag {
  font-family: 'JetBrains Mono', monospace; font-size: .7rem;
  text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent-2); margin-bottom: 12px;
}
.card h3 { font-size: 1.2rem; margin-bottom: 10px; letter-spacing: -.01em; }
.card p { color: var(--text-dim); font-size: .95rem; flex: 1; margin-bottom: 16px; }
.card-link { font-size: .85rem; color: var(--accent); font-weight: 500; }
.card-link.muted { color: var(--text-faint); }
.projects-foot { margin-top: 28px; color: var(--text-dim); }
.projects-foot a { color: var(--accent); font-weight: 600; }

/* CONTACT */
.section-contact { text-align: center; padding-top: 40px; padding-bottom: 90px; }
.contact-inner { max-width: 560px; margin: 0 auto; }
.contact-inner .section-num { display: block; margin-bottom: 10px; }
.contact-inner h2 { font-size: clamp(2rem, 6vw, 3rem); font-weight: 800; letter-spacing: -.03em; margin-bottom: 14px; }
.contact-inner > p { color: var(--text-dim); font-size: 1.1rem; margin-bottom: 28px; }
.contact-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.contact-note { margin-top: 22px; font-size: .85rem; }

/* FOOTER */
.footer {
  border-top: 1px solid var(--border); max-width: var(--max);
  margin: 0 auto; padding: 28px 24px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  color: var(--text-faint); font-size: .85rem;
}

/* TODO markers (visible only while drafting) */
.todo { color: #ff8f6b; font-style: italic; font-size: .9em; }
html[data-theme="light"] .todo { color: #d9531e; }
.todo-li .tl-card { border-style: dashed; }

/* reveal animation */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* responsive */
@media (max-width: 820px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .nav-links { display: none; }
  .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 64px; }
  .hero-meta { gap: 22px; }
  .footer { justify-content: center; text-align: center; }
}