/* Design system */
:root {
  --bg: #0b0f1a;
  --bg-elev: #0f1526;
  --text: #e9eefb;
  --text-dim: #a9b3c9;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.12);
  --accent: #6ee7ff;
  --accent-2: #a78bfa;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --radius-sm: 10px;
  --container: 1120px;
  --space-1: 6px;
  --space-2: 10px;
  --space-3: 16px;
  --space-4: 22px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 72px;
  --space-8: 96px;
}

[data-theme="light"] {
  --bg: #f7f9fe;
  --bg-elev: #ffffff;
  --text: #0b0f1a;
  --text-dim: #3b465b;
  --card: rgba(10, 20, 40, 0.04);
  --border: rgba(10, 20, 40, 0.12);
  --shadow: 0 6px 20px rgba(8, 15, 30, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, rgba(110, 231, 255, 0.08), transparent 60%),
              radial-gradient(1000px 700px at 90% -20%, rgba(167, 139, 250, 0.1), transparent 60%),
              var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: -999px;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
  background: var(--bg-elev);
  color: var(--text);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: saturate(140%) blur(10px);
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  gap: var(--space-2);
  align-items: center;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0f1a;
  font-size: 14px;
  font-weight: 800;
}
.logo-text {
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
}
.nav-list {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  color: var(--text);
  text-decoration: none;
  opacity: 0.9;
}
.nav-list a:hover {
  opacity: 1;
}
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
}
.nav-toggle .nav-toggle-bar,
.nav-toggle .nav-toggle-bar::before,
.nav-toggle .nav-toggle-bar::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
  margin: 0 auto;
}
.nav-toggle .nav-toggle-bar::before,
.nav-toggle .nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
}
.nav-toggle .nav-toggle-bar::before { top: -6px; }
.nav-toggle .nav-toggle-bar::after { top: 6px; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
}
.theme-icon {
  width: 18px;
  height: 18px;
  display: inline-block;
  background: conic-gradient(from 180deg at 50% 50%, #ffcc70, #c850c0, #4158d0, #ffcc70);
  -webkit-mask: radial-gradient(circle at 70% 30%, transparent 6px, black 7px),
                 radial-gradient(circle at 30% 70%, black 10px, black 10px);
  mask: radial-gradient(circle at 70% 30%, transparent 6px, black 7px),
        radial-gradient(circle at 30% 70%, black 10px, black 10px);
  border-radius: 50%;
}

/* Hero */
.hero {
  position: relative;
  padding: var(--space-8) 0 var(--space-7);
  overflow: clip;
}
.bg-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,0.08) 1px, transparent 0);
  background-size: 24px 24px;
  opacity: 0.18;
  pointer-events: none;
}
.bg-orb {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.25;
  pointer-events: none;
}
.orb-1 {
  background: radial-gradient(circle at 50% 50%, #6ee7ff, transparent 60%);
  top: -200px;
  left: -120px;
}
.orb-2 {
  background: radial-gradient(circle at 50% 50%, #a78bfa, transparent 60%);
  top: -260px;
  right: -140px;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 360px;
  align-items: center;
  gap: var(--space-6);
}
.hero-content {
  max-width: 880px;
}
.hero-media {
  display: grid;
  place-items: center;
}
.hero-avatar {
  width: 320px;
  height: 320px;
  border-radius: 28px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35), inset 0 0 0 1px color-mix(in oklab, var(--accent) 15%, transparent);
  object-fit: cover;
  object-position: center;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.08;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.02em;
}
.accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  font-size: clamp(16px, 1.8vw, 20px);
  color: var(--text-dim);
  margin: 0 0 var(--space-5);
}
.hero-cta {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}
.eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}
.chips {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: var(--space-2) 0 0;
}
.chips li {
  border: 1px solid var(--border);
  background: var(--card);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--text);
}

/* Sections */
.section {
  padding: var(--space-7) 0;
}
.section-head {
  max-width: 820px;
  margin-bottom: var(--space-5);
}
.section h2 {
  font-size: clamp(24px, 2.6vw, 34px);
  margin: 0 0 var(--space-2);
}
.section p {
  color: var(--text-dim);
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
}
.about-card {
  grid-column: span 6;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow);
}
.about-card ul {
  margin: 0;
  padding-left: 18px;
}
.about-card.quote blockquote {
  margin: 0;
  color: var(--text-dim);
}
.about-card.quote footer {
  margin-top: var(--space-3);
  color: var(--text);
}

/* Focus cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
}
.card {
  grid-column: span 3;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 80%, transparent), transparent);
  border-radius: var(--radius);
  padding: var(--space-5);
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
  box-shadow: var(--shadow);
}
.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
}
.card-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 25%, transparent), color-mix(in oklab, var(--accent-2) 20%, transparent));
  margin-bottom: var(--space-3);
}
.card h3 {
  margin: 0 0 var(--space-2);
}
.card p {
  margin: 0;
  color: var(--text-dim);
}

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
}
.project {
  grid-column: span 4;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.project-cta {
  align-self: start;
  color: var(--text);
  text-decoration: none;
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--card);
}
.project-cta:hover {
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
}

/* Writing */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-2);
}
.post-list li {
  grid-column: 1 / -1;
}
.post-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 14px 16px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  background: var(--bg-elev);
}
.post-link:hover {
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
}
.post-title {
  font-weight: 600;
}
.post-link time {
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}
.section-cta {
  margin-top: var(--space-4);
}

/* Contact */
.cta {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, color-mix(in oklab, var(--card) 80%, transparent), transparent);
  border-radius: var(--radius);
  padding: var(--space-6);
  display: grid;
  gap: var(--space-3);
  box-shadow: var(--shadow);
}
.cta-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
}
.socials {
  display: flex;
  gap: var(--space-2);
}
.socials a {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  text-decoration: none;
}
.socials a:hover {
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-5) 0;
  background: color-mix(in oklab, var(--bg) 85%, transparent);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.site-footer nav a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: var(--space-3);
}
.site-footer nav a:hover {
  color: var(--text);
}

/* Article pages */
.article {
  padding: var(--space-7) 0;
}
.article-header {
  margin-bottom: var(--space-5);
}
.article-header .eyebrow {
  display: block;
  margin-bottom: var(--space-2);
}
.article h1 {
  margin: 0;
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: -0.01em;
}
.article-meta {
  margin-top: var(--space-2);
  color: var(--text-dim);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.prose {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  border-radius: var(--radius);
  padding: var(--space-6);
  box-shadow: var(--shadow);
  color: var(--text);
}
.prose p {
  margin: 0 0 var(--space-3);
  color: var(--text);
}
.prose h2, .prose h3 {
  margin: var(--space-5) 0 var(--space-2);
}
.prose a {
  color: color-mix(in oklab, var(--accent-2) 60%, var(--text));
  text-decoration: underline;
}
.prose ul, .prose ol {
  margin: 0 0 var(--space-3);
  padding-left: 22px;
}
.prose blockquote {
  margin: var(--space-4) 0;
  padding-left: var(--space-4);
  border-left: 3px solid color-mix(in oklab, var(--accent) 50%, var(--border));
  color: var(--text-dim);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 16px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
}
.button.primary {
  color: #0b0f1a;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none;
}
.button.ghost {
  color: var(--text);
  background: var(--bg-elev);
}
.button:hover {
  transform: translateY(-1px);
}

/* Responsive */
@media (max-width: 960px) {
  .card { grid-column: span 6; }
  .project { grid-column: span 6; }
}
@media (max-width: 720px) {
  .header-inner { height: 60px; }
  .nav-toggle { display: inline-grid; place-items: center; }
  .nav-list {
    position: absolute;
    right: var(--space-4);
    top: 60px;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: var(--space-3);
    flex-direction: column;
    gap: var(--space-2);
    display: none;
  }
  .nav-list.open { display: flex; }
  .about-card { grid-column: 1 / -1; }
  .card { grid-column: 1 / -1; }
  .project { grid-column: 1 / -1; }
  .hero { padding: var(--space-7) 0 var(--space-6); }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .hero-avatar { width: 220px; height: 220px; border-radius: 20px; }
}

/* Motion safe */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* Utilities */
.sr-only {
  border: 0 !important;
  clip: rect(1px, 1px, 1px, 1px) !important;
  -webkit-clip-path: inset(50%) !important;
  clip-path: inset(50%) !important;
  height: 1px !important;
  margin: -1px !important;
  overflow: hidden !important;
  padding: 0 !important;
  position: absolute !important;
  width: 1px !important;
  white-space: nowrap !important;
}