:root {
  --bg: #070b1a;
  --bg2: #0c1330;
  --ink: #eef1ff;
  --muted: #a4adcc;
  --line: rgba(160, 180, 255, 0.14);
  --card: rgba(255, 255, 255, 0.05);
  --card-brd: rgba(255, 255, 255, 0.12);
  --g1: #22d3ee;
  --g2: #a78bfa;
  --g3: #fb7185;
  --g4: #fbbf24;
  --g5: #34d399;
  --g6: #60a5fa;
  --grad: linear-gradient(135deg, #22d3ee, #a78bfa 45%, #fb7185);
  --grad-text: linear-gradient(90deg, #67e8f9, #c4b5fd 40%, #f9a8d4);
  --shadow: 0 20px 60px rgba(2, 6, 23, 0.55);
  --r: 300px;
  --persp: 1300px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
b, strong { font-weight: 700; }

/* ---------- background ---------- */
.bg { position: fixed; inset: 0; z-index: -2; overflow: hidden;
  background:
    radial-gradient(1200px 700px at 15% -10%, #141c46 0%, transparent 55%),
    radial-gradient(1000px 600px at 100% 0%, #241238 0%, transparent 50%),
    linear-gradient(180deg, #070b1a 0%, #0a1028 60%, #070b1a 100%);
}
.orb { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; animation: float 16s ease-in-out infinite; }
.orb-1 { width: 480px; height: 480px; left: -140px; top: 8%; background: #1d4ed8; }
.orb-2 { width: 420px; height: 420px; right: -120px; top: 22%; background: #7c3aed; animation-delay: -4s; }
.orb-3 { width: 380px; height: 380px; left: 32%; bottom: -160px; background: #0e7490; animation-delay: -8s; }
.orb-4 { width: 300px; height: 300px; right: 18%; bottom: 12%; background: #9d174d; animation-delay: -12s; }
@keyframes float { 0%,100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-46px) scale(1.06); } }
.grid-lines { position: absolute; inset: 0; opacity: 0.35;
  background-image:
    linear-gradient(rgba(120, 160, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 160, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 40%, #000 30%, transparent 75%);
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; padding: 14px clamp(16px, 4vw, 48px);
  background: rgba(7, 11, 26, 0.7);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: 0.4px; font-size: 1.05rem; }
.logo-dot { width: 12px; height: 12px; border-radius: 4px; background: var(--grad); box-shadow: 0 0 14px rgba(139, 92, 246, 0.9); }
.nav-links { display: flex; align-items: center; gap: clamp(10px, 2vw, 26px); }
.nav-links a { color: var(--muted); font-size: 0.9rem; font-weight: 600; transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-links .nav-cv { color: var(--g1); border: 1px solid rgba(34, 211, 238, 0.4); padding: 5px 12px; border-radius: 999px; }
.nav-links .nav-cv:hover { background: rgba(34, 211, 238, 0.12); }
.lang { display: flex; gap: 4px; background: rgba(255, 255, 255, 0.05); border: 1px solid var(--line); padding: 4px; border-radius: 999px; }
.lang button { border: 0; background: transparent; color: var(--muted); font-weight: 700; font-size: 0.72rem; padding: 5px 10px; border-radius: 999px; cursor: pointer; transition: all 0.2s; }
.lang button:hover { color: var(--ink); }
.lang button.on { background: var(--grad); color: #0b1023; }

/* ---------- hero ---------- */
.hero { max-width: 1080px; margin: 0 auto; padding: clamp(70px, 12vh, 130px) clamp(16px, 4vw, 48px) 40px; text-align: center; }
.hero-eyebrow { display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.22em; color: var(--g1); background: rgba(34, 211, 238, 0.08); border: 1px solid rgba(34, 211, 238, 0.3); padding: 8px 18px; border-radius: 999px; margin-bottom: 26px; }
.hero-title { font-size: clamp(2.1rem, 5.6vw, 4.2rem); line-height: 1.08; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 22px; }
.hero-title em { font-style: normal; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-intro { max-width: 720px; margin: 0 auto 40px; color: var(--muted); font-size: 1.08rem; }
.hero-stats { display: flex; justify-content: center; gap: clamp(20px, 5vw, 64px); margin-bottom: 40px; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; align-items: center; }
.stat strong { font-size: clamp(1.9rem, 4vw, 2.7rem); font-weight: 800; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--muted); font-size: 0.82rem; font-weight: 600; }
.hero-cta { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 0.95rem; padding: 13px 28px; border-radius: 999px; transition: transform 0.2s var(--ease), box-shadow 0.2s, background 0.2s; cursor: pointer; }
.btn-primary { background: var(--grad); color: #0b1023; box-shadow: 0 10px 34px rgba(139, 92, 246, 0.45); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 44px rgba(139, 92, 246, 0.6); }
.btn-ghost { border: 1px solid rgba(160, 180, 255, 0.35); color: var(--ink); background: rgba(255, 255, 255, 0.03); }
.btn-ghost:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.08); }

/* ---------- sections ---------- */
section { max-width: 1200px; margin: 0 auto; padding: clamp(70px, 10vh, 120px) clamp(16px, 4vw, 48px); }
.section-head { margin-bottom: 48px; }
.section-head.center { text-align: center; }
.section-tag { display: inline-block; font-size: 0.75rem; font-weight: 800; letter-spacing: 0.2em; text-transform: uppercase; color: var(--g1); background: rgba(34, 211, 238, 0.08); border: 1px solid rgba(34, 211, 238, 0.3); padding: 7px 16px; border-radius: 999px; margin-bottom: 18px; }
.section-head h2 { font-size: clamp(1.25rem, 2.6vw, 1.9rem); font-weight: 700; line-height: 1.35; max-width: 860px; color: var(--ink); }
.section-head.center h2 { margin: 0 auto; }

/* ---------- about ---------- */
.about-grid { display: grid; grid-template-columns: 1.6fr 1fr; gap: 44px; align-items: start; }
.about-text p { color: var(--muted); font-size: 1.02rem; margin-bottom: 18px; }
.about-text strong { color: var(--g1); }
.about-facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 26px 0; }
.about-facts > div { background: var(--card); border: 1px solid var(--card-brd); border-radius: 16px; padding: 16px 18px; }
.about-facts b { display: block; font-size: 1.7rem; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.about-facts span { color: var(--muted); font-size: 0.85rem; }
.about-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 22px; }
.about-card { position: sticky; top: 100px; text-align: center; background: var(--card); border: 1px solid var(--card-brd); border-radius: 24px; padding: 40px 28px; box-shadow: var(--shadow); }
.avatar-ring { width: 120px; height: 120px; margin: 0 auto 20px; border-radius: 50%; padding: 4px; background: conic-gradient(from 0deg, var(--g1), var(--g3), var(--g5), var(--g1)); animation: spin 8s linear infinite; }
.avatar { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; border-radius: 50%; background: #0d1533; font-size: 2.4rem; font-weight: 800; }
@keyframes spin { to { transform: rotate(360deg); } }
.about-card h3 { font-size: 1.4rem; margin-bottom: 6px; }
.about-card > p { color: var(--muted); font-size: 0.9rem; margin-bottom: 22px; }
.about-social, .contact-social { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.about-social a, .contact-social a { font-size: 0.8rem; font-weight: 600; color: var(--g1); border: 1px solid rgba(34, 211, 238, 0.3); padding: 6px 12px; border-radius: 999px; transition: all 0.2s; }
.about-social a:hover, .contact-social a:hover { background: rgba(34, 211, 238, 0.12); color: var(--ink); }

/* ---------- orbit ---------- */
.orbit-hint { color: var(--muted); font-size: 0.9rem; margin-top: 16px; }
.orbit-hint::after { content: " 🎡"; }
.orbit-wrap {
  perspective: var(--persp);
  height: clamp(430px, 62vh, 620px);
  position: relative;
}
.orbit { position: absolute; inset: 0; transform-style: preserve-3d; }
.orbit-ring {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  animation: orbitSpin 46s linear infinite;
}
.orbit-wrap.paused .orbit-ring { animation-play-state: paused; }
@keyframes orbitSpin { from { transform: rotateX(-8deg) rotateY(0deg); } to { transform: rotateX(-8deg) rotateY(360deg); } }

.cat-orb {
  position: absolute; left: 50%; top: 50%;
  width: 168px; height: 118px;
  margin-left: -84px; margin-top: -59px;
  border-radius: 18px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; text-align: center; padding: 10px;
  background: rgba(13, 21, 51, 0.72);
  border: 1.5px solid var(--c, #60a5fa);
  box-shadow: 0 0 26px -6px var(--c, #60a5fa), inset 0 0 24px -12px var(--c, #60a5fa);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.35s var(--ease), border-color 0.2s, box-shadow 0.2s;
}
.cat-orb:hover { border-color: var(--c); box-shadow: 0 0 40px -4px var(--c), inset 0 0 30px -10px var(--c); }
.cat-orb.active { border-width: 2.5px; box-shadow: 0 0 52px 2px var(--c), inset 0 0 34px -8px var(--c); }
.cat-orb .co-icon { font-size: 1.7rem; line-height: 1; }
.cat-orb .co-name { font-size: 0.82rem; font-weight: 800; color: #fff; line-height: 1.2; max-width: 130px; }
.cat-orb .co-count { font-size: 0.68rem; font-weight: 700; color: var(--c); }

.orbit-center {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 220px; height: 220px;
  border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px;
  background: radial-gradient(circle at 30% 25%, rgba(255,255,255,0.16), rgba(13, 21, 51, 0.96) 70%);
  border: 2px solid rgba(167, 139, 250, 0.55);
  box-shadow: 0 0 60px 4px rgba(139, 92, 246, 0.55), inset 0 0 44px rgba(34, 211, 238, 0.18);
  z-index: 4;
  animation: centerPulse 5s ease-in-out infinite;
}
@keyframes centerPulse { 0%,100% { box-shadow: 0 0 46px 2px rgba(139,92,246,0.5), inset 0 0 40px rgba(34,211,238,0.16); } 50% { box-shadow: 0 0 74px 8px rgba(34,211,238,0.45), inset 0 0 52px rgba(139,92,246,0.2); } }
.orbit-center-ico { color: var(--g1); font-size: 1.2rem; text-shadow: 0 0 16px var(--g1); }
.orbit-center-title { text-align: center; font-size: 1.85rem; font-weight: 900; letter-spacing: 0.06em; line-height: 1.02; }
.orbit-center-title span { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.orbit-center-sub { margin-top: 6px; font-size: 0.7rem; font-weight: 800; letter-spacing: 0.22em; color: var(--muted); }
.orbit-center-sub b { color: var(--g3); }

/* ---------- results / project cards ---------- */
#catResults { margin-top: 34px; }
.results-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 22px; flex-wrap: wrap; }
.results-title { font-size: 1.3rem; font-weight: 800; }
.results-title span { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.results-close { border: 1px solid var(--line); background: rgba(255,255,255,0.05); color: var(--muted); font-weight: 700; padding: 8px 16px; border-radius: 999px; cursor: pointer; }
.results-close:hover { color: var(--ink); border-color: var(--g3); }
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 22px; }
.empty-note { padding: 26px; border-radius: 18px; border: 1px dashed var(--g5); color: var(--g5); background: rgba(52, 211, 153, 0.05); }

.project-card {
  background: var(--card);
  border: 1px solid var(--card-brd);
  border-radius: 22px;
  overflow: hidden;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow);
  transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.project-card:hover { transform: translateY(-5px); border-color: rgba(167, 139, 250, 0.5); box-shadow: 0 26px 60px rgba(2,6,23,0.7); }
.project-visual { position: relative; aspect-ratio: 16 / 7; overflow: hidden; background: #0a0f28; }
.project-visual svg { width: 100%; height: 100%; display: block; }
.project-body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.project-head strong { font-size: 1.05rem; line-height: 1.25; display: block; }
.project-family { color: var(--g1); font-size: 0.78rem; font-weight: 700; margin-top: 3px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tags span { font-size: 0.7rem; font-weight: 700; color: var(--muted); background: rgba(255,255,255,0.06); border: 1px solid var(--line); padding: 3px 10px; border-radius: 999px; }
.project-evidence p { font-size: 0.9rem; color: var(--muted); }
.project-evidence b { color: var(--ink); display: block; font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--g2); margin-bottom: 2px; }
.outcomes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.outcome { background: rgba(255,255,255,0.04); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; }
.outcome b { display: block; font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--g1); margin-bottom: 4px; }
.outcome p { font-size: 0.84rem; color: var(--muted); }
.metric-chip { display: inline-block; font-size: 1.05rem; font-weight: 800; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.project-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.project-links a { font-size: 0.78rem; font-weight: 700; padding: 7px 14px; border-radius: 999px; border: 1px solid; transition: all 0.2s; }
.link-github { color: #e5e7eb; border-color: rgba(229,231,235,0.35) !important; }
.link-github:hover { background: rgba(229,231,235,0.12); }
.link-kaggle { color: #38bdf8; border-color: rgba(56,189,248,0.4) !important; }
.link-kaggle:hover { background: rgba(56,189,248,0.12); }
.link-hf { color: #fbbf24; border-color: rgba(251,191,36,0.4) !important; }
.link-hf:hover { background: rgba(251,191,36,0.12); }
.link-app { color: #34d399; border-color: rgba(52,211,153,0.4) !important; }
.link-app:hover { background: rgba(52,211,153,0.12); }

/* ---------- apps ---------- */
.apps-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.app-card {
  display: flex; flex-direction: column; gap: 10px;
  background: var(--card); border: 1px solid var(--card-brd); border-radius: 20px;
  padding: 24px; transition: transform 0.3s var(--ease), border-color 0.3s, box-shadow 0.3s;
}
.app-card:hover { transform: translateY(-5px); border-color: rgba(34, 211, 238, 0.5); box-shadow: 0 22px 50px rgba(2,6,23,0.6); }
.app-icon { display: flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 14px; font-weight: 900; font-size: 1.3rem; color: #0b1023; background: var(--grad); box-shadow: 0 8px 22px rgba(139,92,246,0.45); }
.app-card strong { font-size: 1.05rem; }
.app-card small { color: var(--g1); font-weight: 700; font-size: 0.75rem; }
.app-card p { color: var(--muted); font-size: 0.88rem; flex: 1; }
.app-go { color: var(--g5); font-weight: 800; font-size: 0.8rem; }

/* ---------- contact ---------- */
.contact-card { max-width: 620px; margin: 0 auto; text-align: center; background: var(--card); border: 1px solid var(--card-brd); border-radius: 24px; padding: 46px 30px; box-shadow: var(--shadow); }
.contact-ico { font-size: 2rem; color: var(--g1); text-shadow: 0 0 18px var(--g1); margin-bottom: 14px; }
.contact-mail { font-size: clamp(1.2rem, 3vw, 1.6rem); font-weight: 800; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.contact-social { margin-top: 24px; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 44px clamp(16px, 4vw, 48px); text-align: center; }
.footer-fde strong { display: block; margin-bottom: 8px; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; font-size: 1.05rem; }
.footer-fde p { color: var(--muted); max-width: 560px; margin: 0 auto 20px; font-size: 0.9rem; }
.footer-copy { color: var(--muted); font-size: 0.8rem; opacity: 0.7; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .nav-links a:not(.nav-cv) { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .about-card { position: static; }
  .orbit-wrap { --r: 220px; height: 440px; }
  .cat-orb { width: 140px; height: 96px; margin-left: -70px; margin-top: -48px; }
  .orbit-center { width: 160px; height: 160px; }
  .orbit-center-title { font-size: 1.35rem; }
  .outcomes { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .orbit-wrap { --r: 170px; height: 400px; transform: scale(0.9); }
  .cat-orb { width: 120px; height: 88px; margin-left: -60px; margin-top: -44px; }
  .cat-orb .co-name { font-size: 0.72rem; }
}
@media (prefers-reduced-motion: reduce) {
  .orbit-ring { animation: none; }
  .avatar-ring, .orb { animation: none; }
}