:root {
  --blue: #3B8DE8;
  --blue-deep: #0F2A47;
  --blue-pale: #EAF3FE;
  --ink: #10202F;
  --ink-soft: #5A6B7D;
  --white: #FFFFFF;
  --line: #DCE7F3;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; }
.brand-logo {
  height: 46px;
  display: block;
  filter: drop-shadow(0 2px 6px rgba(59,141,232,0.25));
  transition: transform 0.2s ease;
}
.brand:hover .brand-logo { transform: scale(1.04); }
.brand-fallback { font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; color: var(--blue-deep); }
.topbar-nav { display: flex; gap: 28px; flex: 1; justify-content: center; }
.topbar-nav a { font-size: 0.94rem; font-weight: 500; color: var(--ink-soft); transition: color 0.2s ease; }
.topbar-nav a:hover, .topbar-nav a.active { color: var(--blue-deep); }
.topbar-cta {
  background: var(--blue-deep);
  color: var(--white);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.2s ease;
}
.topbar-cta:hover { background: var(--blue); }

.btn-primary {
  background: var(--blue-deep);
  color: var(--white);
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  display: inline-block;
  transition: transform 0.15s ease, background 0.2s ease;
}
.btn-primary:hover { background: var(--blue); transform: translateY(-1px); }
.btn-large { padding: 16px 34px; font-size: 1.05rem; }

/* ---------- Hero ---------- */
.proj-hero { max-width: 900px; margin: 0 auto; padding: 88px 32px 40px; text-align: center; }
.proj-eyebrow { font-size: 0.9rem; color: var(--blue); font-weight: 600; margin: 0 0 18px; }
.proj-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 700;
  color: var(--blue-deep);
  margin: 0 0 20px;
}
.proj-title-accent { color: var(--blue); }
.proj-sub { color: var(--ink-soft); font-size: 1.02rem; line-height: 1.6; max-width: 60ch; margin: 0 auto; }

/* ---------- Jump nav ---------- */
.proj-jump {
  position: sticky;
  top: 69px;
  z-index: 40;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 16px 32px;
  margin-bottom: 16px;
}
.proj-jump a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
  transition: color 0.2s ease;
}
.proj-jump a:hover { color: var(--blue-deep); }

/* ---------- Category ---------- */
.proj-category { max-width: 1140px; margin: 0 auto; padding: 72px 32px; scroll-margin-top: 130px; }
.proj-category-alt { background: var(--blue-pale); max-width: none; border-radius: 0; }
.proj-category-alt > * { max-width: 1140px; margin-left: auto; margin-right: auto; }

.cat-header {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 44px;
  max-width: 1140px;
  padding: 0 32px;
  margin-left: auto;
  margin-right: auto;
}
.proj-category-alt .cat-header { padding: 72px 32px 0; }
.cat-index {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--blue);
  flex-shrink: 0;
}
.cat-header h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--blue-deep);
  margin: 0 0 8px;
  font-weight: 700;
}
.cat-header p { color: var(--ink-soft); font-size: 0.96rem; line-height: 1.55; margin: 0; max-width: 60ch; }

.proj-grid {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.proj-category-alt .proj-grid { padding-bottom: 72px; }

/* Note above tile grid */
.proj-note {
  max-width: 1140px;
  margin: 0 auto 28px;
  padding: 0 32px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* Compact tile grid (many small practice projects) */
.proj-tile-grid {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.proj-tile {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  background: var(--white);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.proj-tile:hover {
  border-color: var(--blue);
  background: var(--blue-pale);
  transform: translateY(-2px);
}
.proj-tile-name { font-size: 0.9rem; font-weight: 500; color: var(--ink); }
.proj-tile-arrow { color: var(--blue); font-weight: 700; flex-shrink: 0; }

/* Empty state */
.proj-empty {
  grid-column: 1 / -1;
  border: 1.5px dashed var(--line);
  border-radius: 14px;
  padding: 48px 24px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* Project card */
.proj-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--white);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  grid-column: span 1;
}
.proj-card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px rgba(15,42,71,0.1); }
.proj-thumb { width: 100%; aspect-ratio: 16/10; background: var(--blue-pale); }
.proj-thumb svg { width: 100%; height: 100%; display: block; }
.proj-body { padding: 22px 22px 26px; }
.proj-tag { font-size: 0.78rem; color: var(--blue); font-weight: 600; margin: 0 0 8px; text-transform: uppercase; letter-spacing: 0.03em; }
.proj-body h3 { font-family: var(--font-display); font-size: 1.15rem; color: var(--blue-deep); margin: 0 0 10px; font-weight: 700; }
.proj-desc { font-size: 0.9rem; color: var(--ink-soft); line-height: 1.55; margin: 0 0 16px; }
.proj-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.proj-stack li {
  font-size: 0.76rem;
  background: var(--blue-pale);
  color: var(--blue-deep);
  padding: 5px 10px;
  border-radius: 999px;
  font-weight: 500;
}
.proj-link {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--blue-deep);
  border-bottom: 1.5px solid var(--blue);
  padding-bottom: 2px;
  transition: color 0.2s ease;
}
.proj-link:hover { color: var(--blue); }

.proj-unavailable {
  font-size: 0.82rem;
  color: var(--ink-soft);
  font-style: italic;
  line-height: 1.5;
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

/* ---------- CTA ---------- */
.proj-cta { background: var(--blue-deep); text-align: center; padding: 96px 32px; }
.proj-cta-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  color: var(--white);
  margin: 0 0 14px;
  font-weight: 700;
}
.proj-cta-sub { color: rgba(255,255,255,0.75); margin: 0 0 32px; font-size: 1.02rem; }
.proj-cta .btn-primary { background: var(--blue); }
.proj-cta .btn-primary:hover { background: var(--white); color: var(--blue-deep); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 56px 32px 28px; }
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
}
.footer-brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; color: var(--blue-deep); }
.footer-tagline { color: var(--ink-soft); font-size: 0.9rem; margin: 10px 0 0; max-width: 30ch; }
.footer-links, .footer-legal { display: flex; flex-direction: column; gap: 10px; }
.footer-links a, .footer-legal a { color: var(--ink-soft); font-size: 0.92rem; transition: color 0.2s ease; }
.footer-links a:hover, .footer-legal a:hover { color: var(--blue-deep); }
.footer-copy {
  max-width: 1100px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.82rem;
  text-align: center;
}

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .topbar-nav { display: none; }
  .proj-jump { top: 0; gap: 20px; }
  .proj-grid { grid-template-columns: 1fr; }
  .proj-tile-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}