/* =========================
   Tokens & themes
   ========================= */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --accent: #06b6d4;
  --accent-2: #a855f7;
  --accent-grad: linear-gradient(135deg, #06b6d4 0%, #a855f7 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --maxw: 1120px;
  --pad-x: clamp(1.25rem, 4vw, 2.5rem);

  --t-fast: 160ms ease;
  --t-mid: 280ms ease;
  --t-slow: 600ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] {
  --bg: #0a0a0c;
  --bg-elev: #111114;
  --bg-card: #0f0f12;
  --border: #1f1f25;
  --border-strong: #2a2a32;
  --text: #ececf1;
  --text-dim: #a1a1aa;
  --text-mute: #71717a;
  --grid-color: rgba(255, 255, 255, 0.035);
  --glow-a: rgba(6, 182, 212, 0.20);
  --glow-b: rgba(168, 85, 247, 0.18);
  --kbd-bg: #1a1a20;
  --shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #fafafa;
  --bg-elev: #ffffff;
  --bg-card: #ffffff;
  --border: #e5e5ea;
  --border-strong: #d4d4d8;
  --text: #18181b;
  --text-dim: #52525b;
  --text-mute: #a1a1aa;
  --grid-color: rgba(0, 0, 0, 0.04);
  --glow-a: rgba(6, 182, 212, 0.18);
  --glow-b: rgba(168, 85, 247, 0.15);
  --kbd-bg: #f4f4f5;
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.15);
  color-scheme: light;
}

/* =========================
   Reset & base
   ========================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background var(--t-mid), color var(--t-mid);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }

/* =========================
   Background decor
   ========================= */
.bg-grid {
  position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
.bg-glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden;
}
.bg-glow::before, .bg-glow::after {
  content: ''; position: absolute; width: 600px; height: 600px;
  border-radius: 50%; filter: blur(120px);
}
.bg-glow::before {
  top: -200px; left: -150px; background: var(--glow-a);
  animation: float 18s ease-in-out infinite alternate;
}
.bg-glow::after {
  bottom: -200px; right: -150px; background: var(--glow-b);
  animation: float 22s ease-in-out infinite alternate-reverse;
}
@keyframes float {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(80px, 40px) scale(1.15); }
}

/* =========================
   Nav
   ========================= */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem var(--pad-x);
  max-width: var(--maxw); margin: 0 auto;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-mid), background var(--t-mid);
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-brand {
  display: flex; align-items: center; gap: 0.55rem;
  font-family: var(--font-mono); font-weight: 600; font-size: 0.95rem;
  letter-spacing: -0.01em;
}
.nav-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent-grad);
  box-shadow: 0 0 12px var(--glow-a);
}
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
  font-size: 0.9rem; color: var(--text-dim);
  transition: color var(--t-fast);
  position: relative;
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -4px; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: left;
  transition: transform var(--t-mid);
}
.nav-links a:hover::after { transform: scaleX(1); }

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  display: grid; place-items: center;
  transition: border-color var(--t-fast), transform var(--t-fast), background var(--t-mid);
}
.theme-toggle:hover { border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle svg { width: 18px; height: 18px; }
[data-theme="dark"] .icon-sun  { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* =========================
   Layout
   ========================= */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.section {
  padding: 6rem 0;
  scroll-margin-top: 80px;
}
@media (max-width: 720px) {
  .section { padding: 4rem 0; }
}

.section-head {
  display: flex; align-items: baseline; gap: 1rem; margin-bottom: 2.5rem;
}
.section-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700; letter-spacing: -0.02em; margin: 0;
}

/* =========================
   Hero
   ========================= */
.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 4rem;
  align-items: center;
  min-height: calc(100vh - 80px);
  padding: 3rem 0 5rem;
}
@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 3rem; min-height: auto; padding: 2rem 0 4rem; text-align: left; }
  .hero-avatar { order: -1; margin: 0 auto; }
}

.badge {
  display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 1.4rem;
  font-family: var(--font-mono);
}
.badge-pulse {
  width: 7px; height: 7px; border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6); }
  70%  { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.035em;
  margin: 0 0 1rem;
}
.accent {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  font-family: var(--font-mono);
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0 0 1.5rem;
}
.hero-bio {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 56ch;
  margin: 0 0 2rem;
}
.kbd {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.1rem 0.45rem;
  background: var(--kbd-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
}

.hero-cta { display: flex; gap: 0.8rem; flex-wrap: wrap; margin-bottom: 2rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.15rem;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform var(--t-fast), background var(--t-mid),
              border-color var(--t-mid), box-shadow var(--t-mid);
}
.btn svg { width: 16px; height: 16px; }
.btn-primary {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 6px 24px -10px var(--glow-a);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 32px -8px var(--glow-a); }
.btn-ghost {
  background: var(--bg-elev);
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }

.hero-meta {
  display: flex; gap: 1.5rem; flex-wrap: wrap;
  color: var(--text-mute);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}
.hero-meta span { display: inline-flex; align-items: center; gap: 0.45rem; }
.hero-meta svg { width: 14px; height: 14px; }

/* Avatar */
.hero-avatar {
  position: relative;
  width: 280px; height: 280px;
  justify-self: center;
}
.hero-avatar img {
  position: relative; z-index: 1;
  width: 100%; height: 100%;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.avatar-ring {
  position: absolute; inset: -8px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent), var(--accent-2), var(--accent));
  filter: blur(1px); opacity: 0.55;
  animation: spin 12s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.avatar-status {
  position: absolute; bottom: 14px; right: 14px; z-index: 2;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--bg);
  display: grid; place-items: center;
  border: 2px solid var(--bg);
}
.avatar-status span {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6);
  animation: pulse 2s infinite;
}

/* =========================
   About / Stack
   ========================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}
@media (max-width: 880px) {
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
}
.about-text p {
  color: var(--text-dim);
  margin: 0 0 1.1rem;
  font-size: 1.02rem;
}
.about-text strong { color: var(--text); font-weight: 600; }

.stack-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
}
.stack-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.2rem;
  transition: border-color var(--t-mid), transform var(--t-mid);
}
.stack-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.stack-card h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-weight: 600;
}
.stack-card ul { list-style: none; padding: 0; margin: 0; }
.stack-card li {
  color: var(--text-dim);
  font-size: 0.92rem;
  padding: 0.2rem 0;
}

/* =========================
   Projects
   ========================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
@media (max-width: 760px) {
  .projects-grid { grid-template-columns: 1fr; }
}

.project-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex; flex-direction: column;
  transition: border-color var(--t-mid), transform var(--t-mid), box-shadow var(--t-mid);
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--accent-grad);
  opacity: 0;
  transition: opacity var(--t-mid);
  pointer-events: none;
  z-index: 0;
  mix-blend-mode: overlay;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.project-card:hover::before { opacity: 0.04; }
.project-card.featured::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent-grad);
  opacity: 0.5;
}

.project-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem;
  margin-bottom: 0.9rem;
  position: relative; z-index: 1;
}
.project-title {
  display: flex; align-items: center; gap: 0.55rem;
}
.project-title h3 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}
.live-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.6);
  animation: pulse 2s infinite;
}
.project-links { display: flex; gap: 0.5rem; }
.project-links a {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  display: grid; place-items: center;
  color: var(--text-dim);
  transition: color var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}
.project-links a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.project-links svg { width: 15px; height: 15px; }

.project-desc {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0 0 1rem;
  flex: 1;
  position: relative; z-index: 1;
}
.project-demo {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 1rem;
  position: relative; z-index: 1;
}
.project-demo:hover { text-decoration: underline; }

.project-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  position: relative; z-index: 1;
}
.project-tags span {
  font-size: 0.74rem;
  padding: 0.25rem 0.6rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* More projects */
.more-projects { margin-top: 3rem; }
.more-projects h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-dim);
  margin: 0 0 1rem;
  font-family: var(--font-mono);
}
.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
}
@media (max-width: 760px) { .mini-grid { grid-template-columns: 1fr; } }
.mini-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  transition: border-color var(--t-fast), transform var(--t-fast);
}
.mini-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.mini-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 0.35rem;
}
.mini-head strong { font-family: var(--font-mono); font-weight: 600; font-size: 0.95rem; }
.mini-head span {
  font-size: 0.72rem;
  color: var(--text-mute);
  font-family: var(--font-mono);
}
.mini-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* =========================
   Contact
   ========================= */
.contact-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  position: relative; overflow: hidden;
}
.contact-box::before {
  content: '';
  position: absolute; top: -100px; right: -100px;
  width: 300px; height: 300px; border-radius: 50%;
  background: var(--accent-grad); opacity: 0.08;
  filter: blur(60px);
}
.contact-lead {
  font-size: 1.1rem;
  color: var(--text-dim);
  margin: 0 0 2rem;
  max-width: 50ch;
  position: relative;
}
.contact-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  position: relative;
}
@media (max-width: 760px) { .contact-links { grid-template-columns: 1fr; } }

.contact-link {
  display: flex; align-items: center; gap: 0.9rem;
  padding: 1rem 1.1rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--t-fast), transform var(--t-fast);
}
.contact-link:not(.static):hover { border-color: var(--accent); transform: translateY(-2px); }
.contact-link svg { width: 22px; height: 22px; color: var(--accent); flex-shrink: 0; }
.contact-link div { display: flex; flex-direction: column; min-width: 0; }
.contact-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-mute);
  font-family: var(--font-mono);
}
.contact-value {
  font-size: 0.93rem;
  color: var(--text);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* =========================
   Footer
   ========================= */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem var(--pad-x);
  border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 0.5rem;
  color: var(--text-mute);
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

/* =========================
   Reveal on scroll
   ========================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================
   Reduced motion
   ========================= */
@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; }
}