/* Portfolio of Janin A Apurba — © Janin A Apurba, CSE, AUST · Advanced ICT Officer, CNRS-UNHCR */
:root {
  --bg: #070b1a;
  --bg-2: #0c1230;
  --text: #e7ecff;
  --muted: #9aa6c8;
  --line: rgba(160, 180, 255, .14);
  --glass: rgba(18, 26, 60, .55);
  --glass-2: rgba(28, 38, 84, .6);
  --glass-border: rgba(160, 180, 255, .16);
  --c1: #22d3ee;
  --c2: #a78bfa;
  --c3: #f59e0b;
  --c4: #f472b6;
  --grad: linear-gradient(120deg, var(--c1), var(--c2) 50%, var(--c4));
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, .6);
  --radius: 20px;
  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
  --aurora-op: .55;
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #f5f7ff;
  --bg-2: #eaefff;
  --text: #121833;
  --muted: #56607f;
  --line: rgba(40, 60, 140, .12);
  --glass: rgba(255, 255, 255, .72);
  --glass-2: rgba(255, 255, 255, .9);
  --glass-border: rgba(60, 80, 160, .14);
  --c1: #0891b2;
  --c2: #7c3aed;
  --c3: #d97706;
  --c4: #db2777;
  --shadow: 0 20px 50px -24px rgba(40, 50, 120, .35);
  --aurora-op: .28;
  color-scheme: light;
}

*, *::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(--text); font: 16px/1.65 var(--sans);
  overflow-x: hidden; -webkit-font-smoothing: antialiased; transition: background .4s, color .4s;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
code { font-family: var(--mono); font-size: .78em; }
button { font: inherit; color: inherit; }
.wrap { width: min(1180px, 100% - 32px); margin-inline: auto; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.center { text-align: center; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--c1); color: #000; padding: 8px 14px; border-radius: 8px; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--c1); outline-offset: 3px; border-radius: 6px; }
.ic { width: 1.1em; height: 1.1em; flex: none; vertical-align: -.18em; }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- animated background ---------- */
.bg { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.aurora { position: absolute; border-radius: 50%; filter: blur(90px); opacity: var(--aurora-op); animation: drift 26s ease-in-out infinite alternate; }
.a1 { width: 55vw; height: 55vw; left: -12vw; top: -18vw; background: radial-gradient(circle, var(--c1), transparent 65%); }
.a2 { width: 50vw; height: 50vw; right: -14vw; top: 10vh; background: radial-gradient(circle, var(--c2), transparent 65%); animation-duration: 32s; animation-delay: -8s; }
.a3 { width: 45vw; height: 45vw; left: 25vw; bottom: -25vw; background: radial-gradient(circle, var(--c4), transparent 65%); animation-duration: 38s; animation-delay: -16s; opacity: calc(var(--aurora-op) * .7); }
@keyframes drift {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(6vw, 4vh) scale(1.12); }
  100% { transform: translate(-4vw, 8vh) scale(.95); }
}
.grid-lines {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 10%, transparent 70%);
  opacity: .6;
}
#net { position: absolute; inset: 0; width: 100%; height: 100%; }
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--grad); z-index: 60; }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 50; transition: background .3s, box-shadow .3s; }
.topbar.scrolled { background: color-mix(in srgb, var(--bg) 78%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); box-shadow: 0 1px 0 var(--line); }
.topbar-inner { width: min(1280px, 100% - 32px); margin: auto; display: flex; align-items: center; gap: 16px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; }
.brand-mark { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 11px; background: var(--grad); color: #0a0e22; font: 700 .9rem var(--sans); box-shadow: 0 6px 20px -6px var(--c2); }
.brand-text { font-family: var(--serif); font-size: 1.1rem; white-space: nowrap; }
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a { text-decoration: none; font-size: .88rem; font-weight: 500; color: var(--muted); padding: 8px 10px; border-radius: 10px; transition: color .2s, background .2s; }
.nav a:hover, .nav a.active { color: var(--text); background: var(--glass); }
.top-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--glass-border); background: var(--glass); cursor: pointer; transition: transform .2s, border-color .2s; }
.icon-btn:hover { transform: translateY(-2px); border-color: var(--c1); }
.i-moon { display: none; }
[data-theme="light"] .i-sun { display: none; }
[data-theme="light"] .i-moon { display: block; }
.menu-btn { display: none; }

/* ---------- buttons, chips ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 14px; font-weight: 600; font-size: .95rem; text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform .2s, box-shadow .2s, border-color .2s, background .2s; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--grad); color: #0a0e22; box-shadow: 0 10px 30px -10px var(--c2); background-size: 200% 100%; animation: shift 6s linear infinite; }
.btn-primary:hover { box-shadow: 0 16px 36px -10px var(--c2); }
@keyframes shift { to { background-position: 200% 0; } }
.btn-ghost { background: var(--glass); border-color: var(--glass-border); backdrop-filter: blur(8px); }
.btn-ghost:hover { border-color: var(--c1); }
.btn-sm { padding: 8px 14px; font-size: .85rem; border-radius: 11px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 0; }
.chip { font-size: .76rem; font-weight: 500; padding: 4px 10px; border-radius: 99px; background: color-mix(in srgb, var(--c2) 14%, transparent); border: 1px solid color-mix(in srgb, var(--c2) 26%, transparent); }
.chip-lg { font-size: .88rem; padding: 7px 14px; transition: transform .2s, background .2s; }
.chip-lg:hover { transform: translateY(-2px); background: color-mix(in srgb, var(--c1) 22%, transparent); }
.tag { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--c1); }
.pill { display: inline-flex; align-items: center; gap: 10px; padding: 8px 16px; border-radius: 99px; font-size: .85rem; font-weight: 500; background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(8px); margin-bottom: 22px; max-width: 100%; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #34d399; box-shadow: 0 0 0 0 rgba(52, 211, 153, .7); animation: ping 2s infinite; flex: none; }
@keyframes ping { 70% { box-shadow: 0 0 0 10px rgba(52, 211, 153, 0); } 100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); } }
.glass { background: var(--glass); border: 1px solid var(--glass-border); border-radius: var(--radius); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); box-shadow: var(--shadow); }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; color: var(--c1); text-decoration: none; }
.link-arrow:hover .ic { transform: translateX(4px); }
.link-arrow .ic { transition: transform .2s; }

/* ---------- hero ---------- */
.hero { position: relative; min-height: calc(100vh - 68px); display: flex; flex-direction: column; justify-content: center; padding: 40px 0 70px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(2.6rem, 6.4vw, 5.2rem); margin: 0 0 14px; }
.hello { display: block; font: 500 clamp(1rem, 1.6vw, 1.2rem) var(--sans); color: var(--muted); letter-spacing: .02em; margin-bottom: 8px; }
.name { display: inline-block; background-size: 200% 100%; animation: shift 8s linear infinite; }
.typed { font: 500 clamp(1.1rem, 2.2vw, 1.5rem) var(--mono); color: var(--c1); min-height: 1.6em; margin-bottom: 12px; }
.caret { display: inline-block; width: 2px; height: 1.1em; background: var(--c1); margin-left: 3px; vertical-align: -.15em; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero-sub { font-size: 1.12rem; color: var(--muted); max-width: 40em; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: .92rem; margin: 18px 0 28px; }
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta .ic { color: var(--c1); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-visual { display: grid; place-items: center; }
.portrait { position: relative; width: min(380px, 78vw); aspect-ratio: 1; }
.portrait img { position: absolute; inset: 9%; width: 82%; height: 82%; object-fit: cover; object-position: 50% 20%; border-radius: 50%; border: 4px solid var(--bg); z-index: 2; box-shadow: 0 30px 80px -20px var(--c2); }
.ring { position: absolute; inset: 4%; border-radius: 50%; background: conic-gradient(from 0deg, var(--c1), var(--c2), var(--c4), var(--c3), var(--c1)); animation: spin 10s linear infinite; filter: drop-shadow(0 0 24px color-mix(in srgb, var(--c2) 60%, transparent)); }
.ring.r2 { inset: -2%; background: none; border: 1px dashed var(--glass-border); animation-duration: 40s; animation-direction: reverse; filter: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.orbit { position: absolute; z-index: 3; font-size: .78rem; font-weight: 600; padding: 7px 13px; border-radius: 99px; background: var(--glass-2); border: 1px solid var(--glass-border); backdrop-filter: blur(10px); box-shadow: var(--shadow); white-space: nowrap; animation: bob 5s ease-in-out infinite; }
.o1 { top: 6%; left: -8%; }
.o2 { top: 22%; right: -14%; animation-delay: -1.2s; }
.o3 { bottom: 16%; left: -12%; animation-delay: -2.4s; }
.o4 { bottom: 4%; right: -4%; animation-delay: -3.6s; }
@keyframes bob { 50% { transform: translateY(-10px); } }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 56px; }
.stat { padding: 20px; border-radius: 18px; background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(10px); text-align: center; }
.stat b { display: block; font: 700 clamp(1.8rem, 3.5vw, 2.6rem) var(--serif); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { font-size: .85rem; color: var(--muted); }
.scroll-cue { position: absolute; left: 50%; bottom: 14px; width: 26px; height: 42px; border: 2px solid var(--glass-border); border-radius: 14px; transform: translateX(-50%); }
.scroll-cue span { position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; border-radius: 2px; background: var(--c1); animation: cue 1.8s infinite; }
@keyframes cue { 80% { transform: translateY(14px); opacity: 0; } 100% { opacity: 0; } }

/* ---------- sections ---------- */
.section { padding: 96px 0; position: relative; }
.sec-head { max-width: 760px; margin-bottom: 40px; }
.kicker { display: inline-block; font: 600 .78rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--c1); margin-bottom: 12px; }
.kicker.small { font-size: .7rem; }
.sec-head h2, .contact h2 { font-size: clamp(2rem, 4.2vw, 3.1rem); }
.lead { font-size: 1.1rem; color: var(--muted); }
.sub-title { font-size: 1.5rem; margin: 56px 0 20px; }
.anchor-offset { scroll-margin-top: 84px; }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .8s cubic-bezier(.2, .7, .2, 1), transform .8s cubic-bezier(.2, .7, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }

/* about */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; }
.about-text { padding: 32px; font-size: 1.04rem; }
.about-text p:last-child { margin: 0; }
.statement { padding: 32px; position: relative; overflow: hidden; background: linear-gradient(160deg, color-mix(in srgb, var(--c2) 20%, var(--glass)), var(--glass)); }
.statement p { font-family: var(--serif); font-size: 1.12rem; line-height: 1.6; }
.interest-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.interest { padding: 26px; border-radius: var(--radius); background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(10px); transition: border-color .3s, transform .3s; position: relative; overflow: hidden; }
.interest::before { content: ''; position: absolute; inset: 0; background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--c1) 16%, transparent), transparent 45%); opacity: 0; transition: opacity .3s; }
.interest:hover::before, .project:hover::before { opacity: 1; }
.interest:hover { border-color: color-mix(in srgb, var(--c1) 50%, transparent); }
.emoji { font-size: 2rem; display: block; margin-bottom: 10px; }
.interest h4 { font-size: 1.2rem; }
.interest p { color: var(--muted); font-size: .94rem; margin: 0; }

/* research */
.research-list { display: grid; gap: 18px; }
.paper { display: grid; grid-template-columns: auto 1fr; gap: 26px; padding: 28px 32px; transition: transform .3s, border-color .3s; }
.paper:hover { transform: translateX(6px); border-color: color-mix(in srgb, var(--c2) 60%, transparent); }
.paper-num { font: 700 2.6rem var(--serif); line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.paper h3 { font-size: 1.45rem; }
.paper-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 10px; }
.status { font-size: .75rem; font-weight: 600; padding: 3px 10px; border-radius: 99px; color: var(--c3); background: color-mix(in srgb, var(--c3) 14%, transparent); border: 1px solid color-mix(in srgb, var(--c3) 30%, transparent); }
.paper p { margin: 0; }
.paper-links { display: flex; gap: 8px; margin-top: 14px; }

/* timeline */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.timeline { list-style: none; margin: 0; padding: 0 0 0 28px; position: relative; }
.timeline::before { content: ''; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(var(--c1), var(--c2), transparent); }
.tl-item { position: relative; margin-bottom: 18px; }
.tl-dot { position: absolute; left: -28px; top: 26px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg); border: 3px solid var(--c1); }
.tl-item.current .tl-dot { background: var(--c1); box-shadow: 0 0 0 6px color-mix(in srgb, var(--c1) 22%, transparent); }
.tl-card { padding: 22px 24px; }
.tl-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.tl-card h3 { font-size: 1.2rem; margin: 0; }
.period { font: 500 .76rem var(--mono); padding: 4px 10px; border-radius: 8px; background: color-mix(in srgb, var(--c1) 12%, transparent); color: var(--c1); white-space: nowrap; }
.org { font-weight: 600; margin: 6px 0 8px; }
.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; font-size: .93rem; }
.ticks li { display: flex; gap: 8px; }
.ticks .ic { color: #34d399; margin-top: .25em; }

/* teaching */
.feature { display: grid; grid-template-columns: 1fr 1.2fr; border-radius: 28px; overflow: hidden; border: 1px solid var(--glass-border); background: linear-gradient(135deg, color-mix(in srgb, var(--c1) 14%, var(--glass)), color-mix(in srgb, var(--c2) 18%, var(--glass))); box-shadow: var(--shadow); backdrop-filter: blur(14px); }
.feature-art { display: grid; place-items: center; padding: 28px; background: radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--c2) 25%, transparent), transparent 70%); }
.feature-art svg { width: 100%; max-width: 420px; }
.feature-art circle { animation: glow 3s ease-in-out infinite; transform-origin: center; transform-box: fill-box; }
.feature-art circle:nth-child(3n) { animation-delay: -1s; }
.feature-art circle:nth-child(3n+1) { animation-delay: -2s; }
@keyframes glow { 50% { transform: scale(1.35); opacity: .7; } }
.feature-body { padding: 40px; }
.feature-body h3 { font-size: 2rem; }
.feature-body .chips { margin-bottom: 24px; }
.mini-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin-top: 18px; }
.mini { padding: 24px; }
.mini p { margin: 0; }

/* skills */
.skill-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.skill { padding: 26px; }
.skill-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.skill h3 { font-size: 1.25rem; margin: 0; }
.level { font-size: .72rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 4px 10px; border-radius: 99px; background: var(--glass-2); border: 1px solid var(--glass-border); color: var(--muted); }
.level.pro { color: #34d399; border-color: rgba(52, 211, 153, .35); }

/* filters */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.filter { cursor: pointer; padding: 8px 14px; border-radius: 99px; border: 1px solid var(--glass-border); background: var(--glass); font-size: .86rem; font-weight: 500; transition: all .2s; }
.filter em { font-style: normal; font-size: .75rem; opacity: .7; margin-left: 4px; }
.filter:hover { border-color: var(--c1); }
.filter.active { background: var(--grad); color: #0a0e22; border-color: transparent; font-weight: 600; }
.is-hidden { display: none !important; }

/* projects */
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.project { padding: 24px; display: flex; flex-direction: column; position: relative; overflow: hidden; transition: border-color .3s; }
.project::before { content: ''; position: absolute; inset: 0; background: radial-gradient(360px circle at var(--mx, 50%) var(--my, 0%), color-mix(in srgb, var(--c2) 18%, transparent), transparent 45%); opacity: 0; transition: opacity .3s; pointer-events: none; }
.project:hover { border-color: color-mix(in srgb, var(--c2) 55%, transparent); }
.project-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.proj-no { font: 600 .8rem var(--mono); color: var(--muted); }
.project h3 { font-size: 1.2rem; }
.project p { margin: 0; font-size: .93rem; }
.project .chips { margin-bottom: 16px; }
.project-links { display: flex; gap: 16px; margin-top: auto; padding-top: 12px; border-top: 1px solid var(--line); }
.project-links a { display: inline-flex; align-items: center; gap: 6px; font-size: .88rem; font-weight: 600; text-decoration: none; color: var(--c1); }
.project-links a:hover { text-decoration: underline; }

/* certificates */
.cert-summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 26px; }
.cert-summary div { padding: 18px; border-radius: 16px; background: var(--glass); border: 1px solid var(--glass-border); text-align: center; }
.cert-summary b { display: block; font: 700 2rem var(--serif); color: var(--c1); }
.cert-summary span { font-size: .82rem; color: var(--muted); }
.cert-tools { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: 12px; }
.cert-tools .filters { flex: 1 1 560px; }
.search { display: flex; align-items: center; gap: 8px; padding: 0 14px; height: 42px; border-radius: 12px; background: var(--glass); border: 1px solid var(--glass-border); flex: 0 1 320px; }
.search input { border: 0; background: none; outline: none; color: var(--text); font: inherit; font-size: .9rem; width: 100%; min-width: 0; }
.search:focus-within { border-color: var(--c1); }
.cert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.cert { display: flex; flex-direction: column; border-radius: 18px; overflow: hidden; background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(10px); transition: transform .3s, border-color .3s, box-shadow .3s; }
.cert:hover { transform: translateY(-6px); border-color: color-mix(in srgb, var(--c1) 55%, transparent); box-shadow: 0 24px 50px -20px color-mix(in srgb, var(--c1) 45%, transparent); }
.cert-media { position: relative; display: block; width: 100%; aspect-ratio: 4 / 3; padding: 12px; border: 0; cursor: zoom-in; background: linear-gradient(135deg, color-mix(in srgb, var(--c1) 10%, var(--bg-2)), color-mix(in srgb, var(--c2) 12%, var(--bg-2))); }
.cert-media img { width: 100%; height: 100%; object-fit: contain; border-radius: 6px; transition: transform .4s; filter: drop-shadow(0 8px 16px rgba(0, 0, 0, .3)); }
.cert:hover .cert-media img { transform: scale(1.04); }
.cert-placeholder { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; border-radius: 8px; border: 1px dashed var(--glass-border); text-align: center; padding: 10px; }
.cert-placeholder span { font-size: 1.8rem; color: var(--c3); }
.cert-placeholder b { font-family: var(--serif); font-size: 1.05rem; }
.cert-placeholder small { color: var(--muted); }
.ribbon { position: absolute; top: 14px; right: 14px; font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; padding: 4px 9px; border-radius: 6px; background: var(--c3); color: #1a1000; }
.cert-body { padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.cert-issuer { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--c1); }
.cert h3 { font: 600 1rem/1.35 var(--sans); margin: 6px 0 8px; }
.cert-meta { display: flex; flex-wrap: wrap; gap: 6px 10px; font-size: .8rem; color: var(--muted); margin-bottom: 12px; }
.cert-meta code { padding: 1px 6px; border-radius: 5px; background: var(--glass-2); }
.verify { margin-top: auto; display: inline-flex; align-items: center; gap: 6px; font-size: .84rem; font-weight: 600; text-decoration: none; color: #34d399; }
.verify:hover { text-decoration: underline; }
.empty { text-align: center; color: var(--muted); padding: 30px; }
.center .btn { margin-top: 28px; }

/* awards, news */
.award-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.award { display: flex; gap: 18px; padding: 26px; }
.award h3 { font-size: 1.25rem; margin-bottom: 6px; }
.award p { margin: 8px 0 0; }
.trophy { flex: none; display: grid; place-items: center; width: 52px; height: 52px; border-radius: 16px; background: linear-gradient(135deg, var(--c3), var(--c4)); color: #fff; font-size: 1.4rem; box-shadow: 0 10px 24px -8px var(--c3); }
.news { list-style: none; margin: 0; padding: 12px 28px; }
.news li { display: grid; grid-template-columns: 130px 1fr; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.news li:last-child { border: 0; }
.news p { margin: 0; }
.news a { color: var(--c1); }
.news-date { font: 500 .8rem var(--mono); color: var(--c1); padding-top: 3px; }

/* profiles */
.prof-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.prof-group { padding: 26px; border-radius: var(--radius); background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(10px); }
.prof-group h3 { font-size: 1.25rem; margin-bottom: 4px; }
.prof-grid { display: grid; gap: 8px; margin-top: 14px; }
.prof { display: flex; align-items: center; gap: 12px; padding: 9px 12px; border-radius: 12px; text-decoration: none; font-weight: 500; font-size: .93rem; border: 1px solid transparent; transition: background .2s, border-color .2s, transform .2s; }
.prof:hover { background: var(--glass-2); border-color: var(--glass-border); transform: translateX(4px); }
.prof-ext { margin-left: auto; opacity: .45; }
.badge { display: grid; place-items: center; width: 34px; height: 34px; flex: none; border-radius: 10px; background: var(--b); color: #fff; font: 700 .72rem var(--sans); box-shadow: 0 6px 14px -6px var(--b); }

/* references */
.ref-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.ref { padding: 26px 22px; text-align: center; }
.ref-avatar { width: 64px; height: 64px; margin: 0 auto 14px; display: grid; place-items: center; border-radius: 50%; background: var(--grad); color: #0a0e22; font: 700 1.25rem var(--serif); }
.ref h3 { font-size: 1.08rem; margin-bottom: 2px; }
.ref-title { font-weight: 600; color: var(--c1); margin-bottom: 6px; font-size: .92rem; }
.ref-mail { display: inline-flex; align-items: center; gap: 6px; font-size: .84rem; color: var(--c1); text-decoration: none; word-break: break-all; }
.ref-mail:hover { text-decoration: underline; }

/* contact */
.contact { display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; padding: 48px; background: linear-gradient(135deg, color-mix(in srgb, var(--c2) 22%, var(--glass)), color-mix(in srgb, var(--c1) 12%, var(--glass))); }
.contact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; align-content: center; }
.contact-list li { display: flex; align-items: center; gap: 14px; padding: 14px; border-radius: 14px; background: var(--glass-2); border: 1px solid var(--glass-border); overflow-wrap: anywhere; }
.contact-list li > span { display: grid; place-items: center; width: 42px; height: 42px; flex: none; border-radius: 12px; background: var(--grad); color: #0a0e22; }
.contact-list small { display: block; color: var(--muted); font-size: .75rem; }
.contact-list a { text-decoration: none; font-weight: 600; }
.contact-list a:hover { color: var(--c1); }

/* footer */
.footer { border-top: 1px solid var(--line); padding: 40px 0 28px; margin-top: 40px; background: color-mix(in srgb, var(--bg) 70%, transparent); backdrop-filter: blur(10px); }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: center; }
.footer-links a { text-decoration: none; color: var(--muted); font-size: .9rem; }
.footer-links a:hover { color: var(--text); }
.footer-bottom { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); font-size: .88rem; }
.footer-bottom p { margin: 0 0 4px; }
.to-top { position: fixed; right: 20px; bottom: 20px; z-index: 40; opacity: 0; pointer-events: none; transform: translateY(12px); transition: opacity .3s, transform .3s; }
.to-top .ic { transform: rotate(90deg); }
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }

/* lightbox */
.lightbox { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; gap: 16px; padding: 24px; background: rgba(4, 6, 16, .88); backdrop-filter: blur(10px); animation: fade .25s; }
.lightbox[hidden] { display: none; }
@keyframes fade { from { opacity: 0; } }
.lb-figure { margin: 0; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; max-width: 1200px; width: 100%; max-height: 100%; align-items: center; }
.lb-img { display: grid; place-items: center; max-height: calc(100vh - 48px); }
.lb-img img { max-height: calc(100vh - 60px); width: auto; max-width: 100%; border-radius: 8px; box-shadow: 0 30px 80px rgba(0, 0, 0, .6); }
.lightbox figcaption { color: #e7ecff; }
.lightbox figcaption h3 { font-size: 1.4rem; margin: 8px 0; }
.lightbox .muted { color: #9aa6c8; }
.lb-close { position: absolute; top: 18px; right: 18px; }
.lb-nav { flex: none; }
.lightbox .icon-btn { background: rgba(30, 40, 80, .7); border-color: rgba(160, 180, 255, .25); color: #fff; }

/* 404 */
.nf { min-height: 70vh; display: grid; place-items: center; padding: 40px 16px; }
.nf-card { padding: 48px; text-align: center; max-width: 560px; }
.nf-card h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); }

/* ---------- printable CV ---------- */
.cv-main { padding: 30px 16px 60px; }
.cv-toolbar { width: min(900px, 100%); margin: 0 auto 16px; display: flex; justify-content: space-between; gap: 10px; }
.cv-paper { width: min(900px, 100%); margin: 0 auto; background: #fff; color: #1c2238; border-radius: 12px; padding: 56px 60px; box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .6); font-size: .95rem; line-height: 1.55; }
.cv-paper a { color: #3b3fb6; }
.cv-head { display: flex; gap: 28px; align-items: center; padding-bottom: 20px; border-bottom: 3px solid #1c2238; }
.cv-head img { width: 118px; height: 140px; object-fit: cover; border-radius: 8px; }
.cv-head h1 { font-size: 2.4rem; margin: 0 0 4px; color: #11162c; }
.cv-role { font-weight: 600; margin: 0 0 8px; color: #3b3fb6; }
.cv-contact { font-size: .82rem; margin: 0; color: #444b66; overflow-wrap: anywhere; }
.cv-sec h2 { font-size: 1.05rem; text-transform: uppercase; letter-spacing: .1em; color: #3b3fb6; border-bottom: 1px solid #d8dcef; padding-bottom: 4px; margin: 26px 0 10px; }
.cv-sec p { margin: 0 0 8px; }
.cv-sec ul, .cv-sec ol { margin: 4px 0 8px; padding-left: 20px; }
.cv-row { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 10px; }
.cv-row > span { white-space: nowrap; font-size: .85rem; color: #555c78; }
.cv-certs { columns: 1; font-size: .86rem; }
.cv-certs code { font-size: .74rem; color: #555c78; }
.cv-refs { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; font-size: .88rem; }
.cv-foot { margin: 30px 0 0; padding-top: 12px; border-top: 1px solid #d8dcef; font-size: .8rem; color: #666d88; text-align: center; }
.cv-paper .muted { color: #666d88; }

@media print {
  @page { margin: 14mm; }
  body { background: #fff !important; }
  .bg, .topbar, .footer, .cv-toolbar, .progress, .to-top { display: none !important; }
  .cv-main { padding: 0; }
  .cv-paper { box-shadow: none; padding: 0; width: 100%; border-radius: 0; }
  .cv-sec { break-inside: auto; }
  .cv-row, .cv-refs > div { break-inside: avoid; }
}

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .nav a { padding: 8px 7px; font-size: .82rem; }
}
@media (max-width: 1040px) {
  .menu-btn { display: inline-grid; }
  .nav { position: fixed; top: 68px; left: 12px; right: 12px; flex-direction: column; padding: 12px; border-radius: 18px; background: var(--glass-2); border: 1px solid var(--glass-border); backdrop-filter: blur(18px); box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(-10px); transition: opacity .25s, transform .25s; }
  .nav.open { opacity: 1; pointer-events: auto; transform: none; }
  .nav a { padding: 12px 14px; font-size: 1rem; }
  .top-actions { margin-left: auto; }
  .hero-grid { grid-template-columns: 1fr; text-align: left; }
  .hero-visual { order: -1; }
  .portrait { width: min(300px, 70vw); }
  .project-grid, .interest-grid { grid-template-columns: repeat(2, 1fr); }
  .ref-grid { grid-template-columns: repeat(2, 1fr); }
  .prof-wrap { grid-template-columns: 1fr 1fr; }
  .lb-figure { grid-template-columns: 1fr; max-height: calc(100vh - 48px); overflow: auto; }
  .lb-img img { max-height: 65vh; }
}
@media (max-width: 800px) {
  .section { padding: 72px 0; }
  .about-grid, .two-col, .feature, .contact, .skill-grid, .award-grid { grid-template-columns: 1fr; }
  .two-col { gap: 24px; }
  .stats, .cert-summary { grid-template-columns: repeat(2, 1fr); }
  .contact { padding: 30px 22px; }
  .feature-body { padding: 28px 22px; }
  .paper { grid-template-columns: 1fr; gap: 8px; padding: 24px; }
  .cv-paper { padding: 32px 22px; }
  .cv-head { flex-direction: column; align-items: flex-start; }
  .cv-refs { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .brand-text { display: none; }
  .project-grid, .interest-grid, .ref-grid, .prof-wrap { grid-template-columns: 1fr; }
  .news { padding: 8px 18px; }
  .news li { grid-template-columns: 1fr; gap: 4px; }
  .orbit { font-size: .7rem; padding: 5px 10px; }
  .o1 { left: -2%; } .o2 { right: -4%; } .o3 { left: -4%; } .o4 { right: 0; }
  .top-actions .btn span { display: none; }
  .about-text, .statement { padding: 24px; }
  .lightbox { padding: 12px; gap: 6px; }
  .lb-nav { position: absolute; bottom: 16px; }
  .lb-prev { left: 16px; } .lb-next { right: 16px; }
  .lb-figure { padding-bottom: 60px; }
  .cv-row { flex-direction: column; gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}