/* ====== Design tokens ====== */
:root {
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --max-width: 1080px;
  --duration: 200ms;
  --easing: cubic-bezier(0.4, 0, 0.2, 1);

  /* Light theme (default) */
  --color-primary: #0F172A;
  --color-on-primary: #FFFFFF;
  --color-accent: #16A34A;
  --color-on-accent: #FFFFFF;
  --color-background: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-foreground: #0F172A;
  --color-muted: #E8ECF1;
  --color-muted-foreground: #475569;
  --color-border: #E2E8F0;
  --color-ring: #16A34A;
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 16px rgba(15, 23, 42, 0.06);
}

html[data-theme="dark"] {
  --color-primary: #1E293B;
  --color-on-primary: #FFFFFF;
  --color-accent: #22C55E;
  --color-on-accent: #052e16;
  --color-background: #0F172A;
  --color-surface: #16213A;
  --color-foreground: #F8FAFC;
  --color-muted: #1C2942;
  --color-muted-foreground: #94A3B8;
  --color-border: #2A3B57;
  --color-ring: #22C55E;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* ====== Reset ====== */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-foreground);
  background: var(--color-background);
  transition: background-color var(--duration) var(--easing), color var(--duration) var(--easing);
  min-height: 100dvh;
}
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

button {
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: var(--color-on-accent);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  z-index: 1000;
}
.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

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

/* ====== Header ====== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-background) 85%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-sm);
}
.logo-bracket { color: var(--color-accent); }

.main-nav {
  display: flex;
  gap: var(--space-5);
}
.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-muted-foreground);
  padding: var(--space-2) 0;
  border-radius: var(--radius-sm);
  transition: color var(--duration) var(--easing);
}
.main-nav a:hover { color: var(--color-foreground); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-muted-foreground);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transition: color var(--duration) var(--easing), border-color var(--duration) var(--easing);
}
.lang-switch:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.theme-toggle {
  position: relative;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  color: var(--color-foreground);
  transition: border-color var(--duration) var(--easing), background-color var(--duration) var(--easing), transform var(--duration) var(--easing);
}
.theme-toggle:hover { border-color: var(--color-accent); }
.theme-toggle:active { transform: scale(0.96); }
.theme-toggle .icon { width: 20px; height: 20px; position: absolute; transition: opacity var(--duration) var(--easing), transform var(--duration) var(--easing); }
.theme-toggle .icon-sun { opacity: 1; transform: rotate(0deg) scale(1); }
.theme-toggle .icon-moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }
html[data-theme="dark"] .theme-toggle .icon-sun { opacity: 0; transform: rotate(90deg) scale(0.6); }
html[data-theme="dark"] .theme-toggle .icon-moon { opacity: 1; transform: rotate(0deg) scale(1); }

/* ====== Hero ====== */
.hero {
  padding: var(--space-8) 0 var(--space-7);
}
.hero-inner { max-width: 760px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
}
.hero h1 {
  font-size: clamp(36px, 6vw, 56px);
  line-height: 1.1;
  margin-bottom: var(--space-2);
}
.hero-role {
  font-size: clamp(17px, 2.4vw, 20px);
  color: var(--color-muted-foreground);
  font-weight: 500;
  margin-bottom: var(--space-4);
}
.hero-role .dot { color: var(--color-accent); margin: 0 var(--space-1); }
.hero-summary {
  font-size: 17px;
  color: var(--color-muted-foreground);
  max-width: 640px;
  margin-bottom: var(--space-5);
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.meta-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 14px;
  color: var(--color-muted-foreground);
}
.meta-item .icon { width: 16px; height: 16px; flex-shrink: 0; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform var(--duration) var(--easing), background-color var(--duration) var(--easing), border-color var(--duration) var(--easing), box-shadow var(--duration) var(--easing);
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--color-accent);
  color: var(--color-on-accent);
}
.btn-primary:hover { box-shadow: 0 6px 20px color-mix(in srgb, var(--color-accent) 35%, transparent); }
.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-foreground);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ====== Section shared ====== */
.section-title {
  font-size: clamp(26px, 4vw, 32px);
  margin-bottom: var(--space-2);
}
.section-subtitle {
  font-size: 16px;
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-6);
}

/* ====== Skills ====== */
.skills {
  padding: var(--space-7) 0;
  border-top: 1px solid var(--color-border);
}
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.skill-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  transition: border-color var(--duration) var(--easing), transform var(--duration) var(--easing);
}
.skill-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.skill-card h3 {
  font-size: 16px;
  margin-bottom: var(--space-3);
}
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.tag-list li {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--color-muted);
  color: var(--color-muted-foreground);
  padding: var(--space-1) var(--space-2);
  border-radius: 6px;
  line-height: 1.4;
}
.tag-note {
  opacity: 0.7;
  font-size: 11px;
}

/* ====== Contact ====== */
.contact {
  padding: var(--space-7) 0 var(--space-8);
  border-top: 1px solid var(--color-border);
}
.contact-inner { text-align: left; }
.contact-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  max-width: 640px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  min-height: 44px;
  transition: border-color var(--duration) var(--easing), transform var(--duration) var(--easing);
}
.contact-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.contact-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-muted);
  color: var(--color-accent);
}
.contact-icon svg { width: 20px; height: 20px; }
.contact-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.contact-label {
  font-size: 12px;
  color: var(--color-muted-foreground);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.contact-value {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ====== Footer ====== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
}
.footer-inner {
  font-size: 13px;
  color: var(--color-muted-foreground);
  text-align: center;
}

/* ====== Responsive ====== */
@media (max-width: 768px) {
  .main-nav { display: none; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-links { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
}