:root {
  --bg: #0b0f14;
  --bg-elev: #111723;
  --text: #e6edf3;
  --muted: #9fb0c0;
  --primary: #64b5f6;
  --primary-600: #42a5f5;
  --accent: #a27bff;
  --ring: rgba(100, 181, 246, 0.35);
  --shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.light {
  --bg: #f7fafc;
  --bg-elev: #ffffff;
  --text: #0f1720;
  --muted: #495a6b;
  --primary: #2563eb;
  --primary-600: #1d4ed8;
  --accent: #7c3aed;
  --ring: rgba(37, 99, 235, 0.25);
  --shadow: 0 8px 24px rgba(2, 6, 23, 0.15);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  background: linear-gradient(180deg, rgba(100,181,246,0.1), transparent 60%), var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: saturate(140%) blur(8px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 4%;
}

.brand {
  font-weight: 800;
  text-decoration: none;
  color: var(--text);
  letter-spacing: 0.5px;
}

.nav-links { 
  list-style: none; 
  display: flex; 
  gap: 18px; 
  margin: 0; 
  padding: 0; 
}

.nav a { 
  color: var(--text); 
  text-decoration: none; 
  opacity: 0.9; 
}

.nav a:hover { opacity: 1; }

.theme-toggle {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
}

.hero {
  padding: 72px 0 36px;
  text-align: center;
}

.hero h1 { 
  font-size: clamp(28px, 4vw, 44px); 
  margin: 8px 0 8px; 
}

.hero p { 
  color: var(--muted); 
  margin: 0 auto 18px; 
  width: min(720px, 92%);
}

.hero-actions { 
  display: flex; 
  gap: 12px; 
  justify-content: center; 
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.15);
  text-decoration: none;
  color: var(--text);
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
  will-change: transform;
}

.btn.primary { 
  background: linear-gradient(180deg, var(--primary), var(--primary-600)); 
  border-color: transparent; 
  color: white; 
  box-shadow: var(--shadow); 
}

.btn.primary:hover { transform: translateY(-2px); }

.btn.ghost:hover { border-color: var(--primary); }

.section { padding: 56px 0; }
.section h2 { font-size: 24px; margin: 0 0 18px; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 16px;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.card:hover { 
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.card h3 { margin: 0 0 8px; font-size: 18px; }
.card .desc { margin: 0 0 10px; color: var(--muted); font-size: 14px; }

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.pill {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  font-size: 14px;
}

.site-footer {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0 36px;
  color: var(--muted);
}

@media (max-width: 720px) {
  .nav-links { display: none; }
  .hero { padding: 56px 0 28px; }
}

/* Category color accents (transparent) */
.card.tag-java { background: linear-gradient(180deg, rgba(255,140,0,0.10), rgba(255,140,0,0.06)); }
.card.tag-python { background: linear-gradient(180deg, rgba(100,181,246,0.12), rgba(100,181,246,0.06)); }
.card.tag-haskell { background: linear-gradient(180deg, rgba(162,123,255,0.12), rgba(162,123,255,0.06)); }
.card.tag-cpp { background: linear-gradient(180deg, rgba(76,175,80,0.12), rgba(76,175,80,0.06)); }
.card.tag-js { background: linear-gradient(180deg, rgba(255,235,59,0.16), rgba(255,235,59,0.08)); }
.card.tag-db { background: linear-gradient(180deg, rgba(33,150,243,0.12), rgba(33,150,243,0.06)); }
.card.tag-devops { background: linear-gradient(180deg, rgba(25,118,210,0.12), rgba(25,118,210,0.06)); }
.card.tag-net { background: linear-gradient(180deg, rgba(244,67,54,0.14), rgba(244,67,54,0.07)); }
.card.tag-os { background: linear-gradient(180deg, rgba(139,195,74,0.16), rgba(139,195,74,0.08)); }
.card.tag-docs { background: linear-gradient(180deg, rgba(158,158,158,0.14), rgba(158,158,158,0.07)); }
.card.tag-science { background: linear-gradient(180deg, rgba(129,199,132,0.16), rgba(129,199,132,0.08)); }

/* Mathematics cards (transparent orange) */
.card.tag-math { background: linear-gradient(180deg, rgba(255,140,0,0.12), rgba(255,140,0,0.06)); }

/* Tasks cards */
.card.tag-task-math { background: linear-gradient(180deg, rgba(244,67,54,0.14), rgba(244,67,54,0.07)); }
.card.tag-task-soft { background: linear-gradient(180deg, rgba(33,150,243,0.12), rgba(33,150,243,0.06)); }
.card.tag-task-web { background: linear-gradient(180deg, rgba(27,94,32,0.16), rgba(27,94,32,0.08)); }

/* Task links color */
.task-links a { color: #ffffff; text-decoration: none; }
.task-links a:hover { text-decoration: underline; }

/* Light theme overrides for Math/Tasks text */
.light .task-links a { color: #000000; }