/* ---------- Design tokens ---------- */
:root {
  /* Surfaces */
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #1c2128;
  --border: #30363d;
  --border-strong: #484f58;

  /* Text */
  --text: #e6edf3;
  --text-muted: #8b949e;
  --text-dim: #6e7681;

  /* Accent */
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-dim: rgba(88, 166, 255, 0.12);

  /* Status colors */
  --green: #3fb950;
  --green-bg: rgba(63, 185, 80, 0.12);
  --amber: #d29922;
  --amber-bg: rgba(210, 153, 34, 0.12);
  --grey: #8b949e;
  --grey-bg: rgba(139, 148, 158, 0.12);

  /* Type */
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Poppins', 'Inter', system-ui, sans-serif;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;

  /* Layout */
  --container: 1100px;
  --gutter: 1.5rem;
  --radius: 12px;
  --radius-sm: 6px;

  /* Motion */
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, figure { margin: 0; }
ul { padding: 0; list-style: none; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ---------- Base ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-dim); color: var(--text); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1rem var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus,
.nav-links a.active {
  color: var(--text);
}

/* ---------- Hero ---------- */
.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) var(--gutter) clamp(3rem, 8vw, 5rem);
  text-align: center;
}

.kicker {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.accent { color: var(--accent); }

.lede {
  font-size: var(--fs-lg);
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--fs-sm);
  transition: all var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #0a0e14;
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover,
.btn-ghost:focus {
  border-color: var(--border-strong);
  background: var(--bg-elev);
}

/* ---------- Sections ---------- */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--gutter);
}

.section-head {
  margin-bottom: 2.5rem;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.section-sub {
  color: var(--text-muted);
  font-size: var(--fs-base);
}

/* ---------- Project grid ---------- */
.project-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
}

.card.featured {
  grid-column: 1 / -1;
  border-color: var(--accent-dim);
}

.card.featured:hover {
  border-color: var(--accent);
}

.card.placeholder {
  background: transparent;
  border-style: dashed;
}

.card.placeholder:hover {
  background: var(--bg-elev);
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  flex: 1;
}

.card code {
  background: var(--bg);
  color: var(--text);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ---------- Status pills ---------- */
.status {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.status-live      { color: var(--green); background: var(--green-bg); }
.status-coming    { color: var(--amber); background: var(--amber-bg); }
.status-previous  { color: var(--grey);  background: var(--grey-bg); }

/* ---------- Tech badges ---------- */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.badges li {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

/* ---------- Card links ---------- */
.card-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: auto;
}

.card-links a {
  color: var(--accent);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: color var(--transition);
}

.card-links a:hover,
.card-links a:focus {
  color: var(--accent-hover);
}

/* ---------- About ---------- */
.about-content {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-content p {
  color: var(--text);
  font-size: var(--fs-lg);
  line-height: 1.7;
}

.about-content a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
  transition: border-color var(--transition);
}

.about-content a:hover {
  border-bottom-color: var(--accent);
}

.skills-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.skills-grid h4 {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.skills-grid p {
  color: var(--text-muted);
  font-size: var(--fs-sm);
  line-height: 1.6;
}

/* ---------- Contact ---------- */
.contact-list {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  max-width: 720px;
}

.contact-list a {
  display: block;
  padding: 1rem 1.25rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.contact-list a:hover,
.contact-list a:focus {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.contact-list strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.contact-list span {
  color: var(--text-muted);
  font-size: var(--fs-sm);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem var(--gutter);
  margin-top: 2rem;
  text-align: center;
}

.site-footer p {
  max-width: var(--container);
  margin: 0 auto;
  color: var(--text-dim);
  font-size: var(--fs-sm);
}

.site-footer a {
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.site-footer a:hover { color: var(--text); }

/* ---------- Motion ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 640px) {
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.8rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { text-align: center; }
}