/* ============================================================
   THARINDA PIYADASA — Personal Site
   Dark minimal, refined typographic aesthetic
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Mono:wght@300;400;500&family=Outfit:wght@300;400;500;600&display=swap');

/* ── Variables ───────────────────────────────────────────── */
:root {
  --bg:          #0d0d0f;
  --bg-2:        #131316;
  --bg-3:        #1a1a1f;
  --border:      rgba(255,255,255,0.07);
  --border-h:    rgba(255,255,255,0.14);
  --text:        #e8e6e1;
  --text-dim:    #7a7880;
  --text-mid:    #a8a5b0;
  --accent:      #7c9fff;
  --accent-warm: #c4a882;
  --accent-glow: rgba(124,159,255,0.12);
  --mono:        'DM Mono', monospace;
  --serif:       'DM Serif Display', Georgia, serif;
  --sans:        'Outfit', sans-serif;
  --radius:      6px;
  --nav-h:       64px;
  --max-w:       1100px;
  --transition:  200ms cubic-bezier(0.4,0,0.2,1);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }

/* ── Nav ─────────────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 3rem);
  background: rgba(13,13,15,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: var(--serif);
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--text);
  white-space: nowrap;
}
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex; gap: 2rem; align-items: center;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a.active::after {
  content: '';
  display: block;
  height: 1px;
  background: var(--accent);
  margin-top: 2px;
}

/* hamburger */
.nav-burger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 4px;
}
.nav-burger span {
  display: block; width: 22px; height: 1px;
  background: var(--text-dim); transition: var(--transition);
}
.nav-mobile {
  display: none; position: fixed; top: var(--nav-h); left: 0; right: 0;
  background: var(--bg-2); border-bottom: 1px solid var(--border);
  padding: 1.5rem clamp(1.5rem, 5vw, 3rem);
  flex-direction: column; gap: 1.2rem; z-index: 99;
}
.nav-mobile a {
  font-family: var(--mono); font-size: 0.85rem;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-dim);
}
.nav-mobile.open { display: flex; }

/* ── Layout helpers ──────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 5vw, 3rem);
}
.page-content {
  padding-top: calc(var(--nav-h) + 3rem);
  padding-bottom: 5rem;
}
.section { margin-bottom: 5rem; }
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  display: flex; align-items: center; gap: 1rem;
}
.section-label::after {
  content: '';
  flex: 1; height: 1px;
  background: var(--border);
  max-width: 200px;
}
h1 { font-family: var(--serif); font-weight: 400; }
h2 { font-family: var(--serif); font-weight: 400; font-size: 1.8rem; margin-bottom: 1rem; }
h3 { font-family: var(--sans); font-weight: 500; font-size: 1rem; }
p { color: var(--text-mid); line-height: 1.8; }

/* ── Buttons & badges ────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border: 1px solid var(--border-h);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-mid);
  transition: all var(--transition);
  cursor: pointer; background: none;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}
.btn-primary {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent);
}
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.badge-blue { background: rgba(124,159,255,0.12); color: var(--accent); }
.badge-warm { background: rgba(196,168,130,0.12); color: var(--accent-warm); }
.badge-dim  { background: rgba(255,255,255,0.05); color: var(--text-dim); }

/* ── Cards ───────────────────────────────────────────────── */
.card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--border-h);
  transform: translateY(-2px);
}

/* ── Tag chips ───────────────────────────────────────────── */
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.75rem; }
.tag {
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

/* ── Social icons ────────────────────────────────────────── */
.social-links { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.social-link {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--mono); font-size: 0.75rem;
  letter-spacing: 0.06em; color: var(--text-dim);
  transition: color var(--transition);
}
.social-link:hover { color: var(--accent); }
.social-link svg { width: 15px; height: 15px; }

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem clamp(1.5rem, 5vw, 3rem);
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.footer-copy {
  font-family: var(--mono); font-size: 0.72rem;
  color: var(--text-dim); letter-spacing: 0.04em;
}

/* ── Divider ─────────────────────────────────────────────── */
.divider {
  height: 1px; background: var(--border); margin: 3rem 0;
}

/* ── Fade-in animation ───────────────────────────────────── */
.fade-up {
  opacity: 0; transform: translateY(20px);
  animation: fadeUp 0.6s ease forwards;
}
@keyframes fadeUp {
  to { opacity: 1; transform: none; }
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .footer { flex-direction: column; align-items: flex-start; }
}