/* =========================================================
   Theme tokens: dark by default, light via toggle or OS
   ========================================================= */
:root {
  color-scheme: dark;
  --bg: #0a0d14;
  --bg-alt: #0e121b;
  --surface: #131826;
  --surface-2: #19202f;
  --line: #232b3d;
  --ink: #e7eaf2;
  --muted: #8e98ad;
  --accent: #7c8cff;
  --accent-2: #2ee6c5;
  --grad: linear-gradient(100deg, #8b9bff 0%, #5ad8ff 50%, #2ee6c5 100%);
  --glow: rgba(124, 140, 255, .18);
  --shadow: 0 24px 60px -30px rgba(0, 0, 0, .7);
  --radius: 18px;
  --display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f8fb;
  --bg-alt: #eef1f7;
  --surface: #ffffff;
  --surface-2: #f2f4f9;
  --line: #dfe4ee;
  --ink: #111726;
  --muted: #5b6579;
  --accent: #4b5cf0;
  --accent-2: #0ea38a;
  --grad: linear-gradient(100deg, #4b5cf0 0%, #2389d6 50%, #0ea38a 100%);
  --glow: rgba(75, 92, 240, .10);
  --shadow: 0 24px 50px -30px rgba(20, 30, 60, .35);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #f7f8fb;
    --bg-alt: #eef1f7;
    --surface: #ffffff;
    --surface-2: #f2f4f9;
    --line: #dfe4ee;
    --ink: #111726;
    --muted: #5b6579;
    --accent: #4b5cf0;
    --accent-2: #0ea38a;
    --grad: linear-gradient(100deg, #4b5cf0 0%, #2389d6 50%, #0ea38a 100%);
    --glow: rgba(75, 92, 240, .10);
    --shadow: 0 24px 50px -30px rgba(20, 30, 60, .35);
  }
}

/* =========================================================
   Base
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1rem/1.7 var(--sans); overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
p { margin: 0 0 1em; }
h1, h2, h3 { font-family: var(--display); line-height: 1.12; letter-spacing: -.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.6rem, 7vw, 4.6rem); font-weight: 700; }
h2 { font-size: clamp(1.9rem, 4.2vw, 2.9rem); font-weight: 700; }
h3 { font-size: 1.12rem; font-weight: 600; letter-spacing: -.01em; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--accent); color: #fff; }

.container { width: 100%; max-width: 1160px; margin: 0 auto; padding-inline: 24px; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.kicker { color: var(--accent-2); font-size: .85rem; letter-spacing: .02em; margin-bottom: 1rem; }

.card {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); transition: border-color .25s, transform .25s, box-shadow .25s;
}
/* cursor spotlight inside cards */
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), var(--glow), transparent 45%);
  transition: opacity .3s;
}
.card:hover::before { opacity: 1; }
.card:hover { border-color: color-mix(in oklab, var(--accent) 45%, var(--line)); }

/* Page-level spotlight following the cursor */
.spotlight {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background: radial-gradient(600px circle at var(--sx, 50%) var(--sy, -20%), var(--glow), transparent 40%);
}
main, .footer { position: relative; z-index: 1; }

/* Scroll progress */
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 100%; transform-origin: 0 50%; transform: scaleX(0); background: var(--grad); z-index: 60; }

/* =========================================================
   Buttons, chips, tags
   ========================================================= */
.btn {
  display: inline-flex; align-items: center; gap: .55em; padding: .85em 1.4em; border-radius: 12px;
  font: 600 .95rem var(--sans); text-decoration: none; cursor: pointer; border: 1px solid transparent;
  transition: transform .2s, box-shadow .2s, background .2s, border-color .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--ink); color: var(--bg); box-shadow: 0 10px 30px -12px var(--accent); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); }

.tags { list-style: none; padding: 0; margin: 1rem 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.tags li { font: 500 .75rem var(--mono); color: var(--muted); background: var(--surface-2); border: 1px solid var(--line); padding: 3px 9px; border-radius: 999px; }

/* =========================================================
   Nav
   ========================================================= */
.nav-wrap {
  position: sticky; top: 0; z-index: 50;
  padding-top: env(safe-area-inset-top, 0px);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent; transition: border-color .3s;
}
.nav-wrap.scrolled { border-color: var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.logo { font: 700 1.45rem var(--display); text-decoration: none; letter-spacing: -.03em; }
.logo i { font-style: normal; color: var(--accent-2); }
.nav-links { display: flex; gap: 4px; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: .92rem; font-weight: 500; padding: 8px 12px; border-radius: 10px; transition: color .2s, background .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--ink); background: var(--surface-2); }
.nav-links a.nav-resume { color: var(--accent-2); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn, .kbd-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 38px; min-width: 38px; padding: 0 10px;
  border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; font: 500 .85rem var(--sans);
}
.icon-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.kbd-btn span { color: var(--muted); }
kbd { font: 500 .72rem var(--mono); background: var(--surface-2); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; color: var(--muted); }
.i-sun { display: none; }
:root[data-theme="light"] .i-sun { display: block; }
:root[data-theme="light"] .i-moon { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .i-sun { display: block; }
  :root:not([data-theme="dark"]) .i-moon { display: none; }
}
.menu-btn { display: none; }

/* =========================================================
   Hero
   ========================================================= */
.hero { position: relative; padding: 72px 0 56px; overflow: hidden; }
.grid-bg {
  position: absolute; inset: 0; z-index: -1; opacity: .5;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 75%);
}
.hero-grid { display: grid; grid-template-columns: 1.25fr .9fr; gap: 56px; align-items: center; }
.creds { list-style: none; padding: 0; margin: -.2rem 0 1.3rem; display: flex; flex-wrap: wrap; gap: 8px; }
.creds li { display: inline-flex; align-items: center; gap: 8px; padding: 6px 13px 6px 7px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line); font-size: .9rem; font-weight: 500; }
.creds strong { font-weight: 700; }
.creds img { width: 22px; height: 22px; border-radius: 6px; background: #fff; object-fit: contain; }
.cred-num { display: inline-grid; place-items: center; min-width: 22px; height: 22px; padding: 0 5px; border-radius: 6px; background: var(--grad); color: #fff; font: 700 .78rem var(--display); }
.typed-line { font: 500 clamp(1.15rem, 2.4vw, 1.5rem) var(--display); color: var(--muted); margin-bottom: 1.2rem; min-height: 1.6em; }
.typed { color: var(--ink); }
.caret { display: inline-block; width: 2px; height: 1.1em; margin-left: 3px; vertical-align: -.15em; background: var(--accent-2); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 60ch; }
.lead a { color: var(--ink); text-decoration-color: var(--accent); text-underline-offset: 3px; }
.lead strong { color: var(--ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 24px; }
.socials { list-style: none; padding: 0; margin: 0; display: flex; gap: 10px; }
.socials a { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--line); color: var(--muted); background: var(--surface); transition: color .2s, border-color .2s, transform .2s; }
.socials a:hover { color: var(--ink); border-color: var(--accent); transform: translateY(-2px); }
.socials svg { width: 18px; height: 18px; }
.hf { font-size: 1.1rem; filter: grayscale(.2); }

.hero-visual { position: relative; justify-self: center; width: min(100%, 380px); }
.photo-card {
  position: relative; border-radius: 28px; padding: 6px; background: var(--grad); box-shadow: var(--shadow);
  transform-style: preserve-3d; transition: transform .2s ease-out;
}
.photo-card img { border-radius: 23px; aspect-ratio: 4 / 5; object-fit: cover; width: 100%; height: auto; }
.chip {
  position: absolute; display: inline-flex; align-items: center; gap: 8px; white-space: nowrap;
  padding: 8px 14px; border-radius: 12px; font-size: .82rem; font-weight: 500;
  background: color-mix(in oklab, var(--surface) 88%, transparent); border: 1px solid var(--line);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); box-shadow: var(--shadow);
  animation: float 6s ease-in-out infinite;
}
.chip-a { top: 8%; left: -18%; }
.chip-b { bottom: 18%; right: -14%; animation-delay: -2s; }
.chip-c { bottom: -3%; left: 4%; animation-delay: -4s; font-size: .75rem; }
@keyframes float { 50% { transform: translateY(-8px); } }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 0 0 var(--accent-2); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent-2) 70%, transparent); } 70%, 100% { box-shadow: 0 0 0 10px transparent; } }

/* =========================================================
   Stats
   ========================================================= */
.stats.container { width: calc(100% - 48px); max-width: 1112px; padding-inline: 0; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-block: 8px 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.stat { padding: 26px 22px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font: 700 clamp(1.9rem, 3.4vw, 2.6rem) var(--display); letter-spacing: -.03em; line-height: 1.1; }
.stat strong span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat > span { color: var(--muted); font-size: .88rem; }

/* =========================================================
   Sections
   ========================================================= */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section-head { margin-bottom: 48px; max-width: 720px; }
.sub { color: var(--muted); margin-top: -.2em; }

/* About */
.about-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: start; }
.about-text p { color: var(--muted); font-size: 1.05rem; }
.about-text strong { color: var(--ink); }
.focus-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.focus { padding: 22px; }
.focus p { color: var(--muted); font-size: .92rem; margin: 0; }
.focus-icon { font-size: 1.5rem; width: 46px; height: 46px; display: grid; place-items: center; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--line); margin-bottom: 14px; }

/* Timeline */
.timeline { list-style: none; margin: 0; padding: 0 0 0 28px; position: relative; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(var(--accent), var(--accent-2), transparent); border-radius: 2px; }
.job { position: relative; padding-bottom: 20px; }
.job-dot { position: absolute; left: -28px; top: 30px; width: 14px; height: 14px; border-radius: 50%; background: var(--bg); border: 3px solid var(--accent); }
.job:first-child .job-dot { border-color: var(--accent-2); box-shadow: 0 0 0 6px color-mix(in oklab, var(--accent-2) 25%, transparent); }
.job-card { padding: 22px 24px; }
.job-head { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.job-head h3 { margin: 0; font-size: 1.2rem; }
.job-head h3 a { text-decoration: none; }
.job-head h3 a:hover { color: var(--accent); }
.job-head p { margin: 0; }
.job-logo { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; font: 700 1.1rem var(--display); color: #fff; background: var(--grad); }
.logo-img { background: #fff; padding: 4px; object-fit: contain; border: 1px solid var(--line); }
.edu-logo { flex: none; width: 64px; height: 64px; border-radius: 14px; }
.rank { display: inline-block; font-size: .8rem; font-weight: 600; color: var(--accent-2); background: color-mix(in oklab, var(--accent-2) 12%, transparent); border: 1px solid color-mix(in oklab, var(--accent-2) 35%, transparent); padding: 3px 10px; border-radius: 999px; margin: 2px 0 8px !important; }
.focus p strong { color: var(--ink); }
.role { border-top: 1px dashed var(--line); }
.role summary { list-style: none; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; padding: 12px 0; cursor: pointer; }
.role summary::-webkit-details-marker { display: none; }
.role-title { font-weight: 600; }
.role-dates { font-size: .8rem; color: var(--accent-2); }
.chev { margin-left: auto; width: 9px; height: 9px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); transition: transform .25s; }
.role[open] .chev { transform: rotate(-135deg); }
.highlights { margin: 0 0 14px; padding-left: 1.1em; color: var(--muted); }
.highlights li { margin-bottom: .45em; }
.highlights li::marker { color: var(--accent); }
.highlights strong { color: var(--ink); font-weight: 600; }
.highlights a { color: var(--ink); text-decoration-color: var(--accent); }
.awards { margin: 6px 0 0; font-size: .88rem; color: var(--muted); }

/* Projects */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; }
.filter { font: 500 .88rem var(--sans); padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); cursor: pointer; transition: all .2s; }
.filter:hover { color: var(--ink); border-color: var(--accent); }
.filter.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.project { display: flex; flex-direction: column; padding: 24px; text-decoration: none; color: inherit; }
.project:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.project-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.folder { font-size: 1.6rem; }
.project-link { font-size: .78rem; color: var(--muted); transition: color .2s; }
.project:hover .project-link { color: var(--accent-2); }
.project p { color: var(--muted); font-size: .93rem; margin-bottom: 0; }
.project .tags { margin-top: auto; padding-top: 16px; }
.metric { color: var(--accent-2) !important; font-size: .82rem !important; margin: -4px 0 8px !important; }
.project.hide { display: none; }

/* Skills */
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.skill-group { padding: 24px; }
.skill-chips { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.skill-chips li { font-size: .88rem; font-weight: 500; padding: 7px 13px; border-radius: 10px; background: var(--surface-2); border: 1px solid var(--line); transition: transform .2s, border-color .2s, color .2s; cursor: default; }
.skill-chips li:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent); }

/* Education */
.edu-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 18px; align-items: start; }
.edu-list { display: grid; gap: 18px; }
.edu { display: flex; gap: 18px; padding: 24px; }
.edu h3 { margin-bottom: .2em; }
.edu .degree { margin-bottom: .4em; font-weight: 500; }
.edu p { margin-bottom: .3em; }
.honors { padding: 24px; }
.honors h3 { font-size: 1rem; margin-top: 1.2em; }
.honors h3:first-child { margin-top: 0; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.check-list li { position: relative; padding-left: 26px; color: var(--muted); font-size: .93rem; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-2); font-weight: 700; }
.check-list.star li::before { content: "★"; color: #f5b942; }

/* Contact */
.contact { overflow: hidden; padding: clamp(32px, 6vw, 72px); text-align: center; }
.contact .lead { margin-inline: auto; }
.contact-glow { position: absolute; inset: -40% -10% auto; height: 120%; background: radial-gradient(closest-side, var(--glow), transparent); pointer-events: none; }
.contact-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; position: relative; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 28px 0 calc(28px + env(safe-area-inset-bottom, 0px)); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font-size: .88rem; color: var(--muted); }
.footer p { margin: 0; }

/* Toast */
.toast { position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); z-index: 80; background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 12px; font-weight: 500; box-shadow: var(--shadow); }

/* Command palette */
.palette { position: fixed; inset: 0; z-index: 90; display: grid; place-items: start center; padding: 14vh 16px 16px; background: rgba(5, 8, 14, .55); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.palette-box { width: min(560px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
.palette-input { width: 100%; border: 0; border-bottom: 1px solid var(--line); background: transparent; color: var(--ink); font: 500 1rem var(--sans); padding: 18px 20px; outline: none; }
.palette-list { list-style: none; margin: 0; padding: 8px; max-height: 50vh; overflow: auto; }
.palette-list li { padding: 10px 14px; border-radius: 10px; cursor: pointer; color: var(--muted); }
.palette-list li.sel { background: var(--surface-2); color: var(--ink); }
.palette-hint { margin: 0; padding: 10px 16px; border-top: 1px solid var(--line); font-size: .75rem; color: var(--muted); display: flex; gap: 6px; align-items: center; }

/* 404 */
.hero-404 { min-height: 60vh; display: grid; place-items: center; }
.hero-404 .lead { margin: 0 auto 24px; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .chip, .pulse, .caret { animation: none; }
  .photo-card { transform: none !important; }
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1000px) {
  .hero-grid, .about-grid, .edu-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; width: min(70%, 300px); }
  .chip-a { left: -22%; } .chip-b { right: -22%; }
  .project-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 760px) {
  .menu-btn { display: inline-flex; }
  .kbd-btn { display: none; }
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; padding: 8px 16px 16px;
    background: var(--bg); border-bottom: 1px solid var(--line); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px; }
  .section { padding: 72px 0; }
  .hero { padding-top: 40px; }
  .project-grid, .skills-grid, .focus-grid { grid-template-columns: 1fr; }
  .container { padding-inline: 18px; }
  .stats.container { width: calc(100% - 36px); }
}
@media (max-width: 480px) {
  .chip-a, .chip-b { display: none; }
  .chip-c { left: 50%; transform: translateX(-50%); animation: none; }
  .stat { padding: 20px 16px; }
  .edu { flex-direction: column; gap: 12px; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
}