:root {
  --bg:            oklch(96% 0.008 75);
  --bg-card:       oklch(99% 0.004 75);
  --bg-muted:      oklch(93% 0.012 75);
  --bg-dark:       oklch(22% 0.015 250);

  --border:        oklch(88% 0.012 75);
  --border-dark:   oklch(30% 0.02 250);
  --border-hover:  oklch(78% 0.08 250);

  --text:          oklch(18% 0.015 75);
  --text-2:        oklch(52% 0.01 75);
  --text-muted:    oklch(70% 0.008 75);

  --accent:        oklch(52% 0.15 250);
  --accent-h:      oklch(44% 0.15 250);
  --accent-warm:   oklch(62% 0.13 55);

  --tag-bg:        oklch(92% 0.018 250);
  --tag-text:      oklch(40% 0.12 250);

  --r:             10px;
  --r-sm:          6px;

  --font-serif:    'Noto Serif SC', serif;
  --font-sans:     'Noto Sans SC', sans-serif;
  --font-mono:     'JetBrains Mono', monospace;

  --sidebar-w:     220px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-weight: 300;
  display: flex;
}

/* ── Sidebar ─────────────────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  background: var(--bg-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 10;
}

.sidebar-brand {
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--border-dark);
}

.sidebar-brand-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: oklch(94% 0.005 75);
  letter-spacing: -0.01em;
  text-decoration: none;
  display: block;
}

.sidebar-brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: oklch(45% 0.02 250);
  letter-spacing: 0.1em;
  margin-top: 3px;
}

.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
}

.nav-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: oklch(40% 0.02 250);
  letter-spacing: 0.15em;
  padding: 10px 12px 4px;
  text-transform: uppercase;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--r-sm);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  color: oklch(62% 0.015 250);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: all 0.15s;
  text-decoration: none;
}

.nav-item:hover {
  background: oklch(28% 0.02 250);
  color: oklch(88% 0.01 75);
}

.nav-item.active {
  background: oklch(52% 0.15 250 / 0.2);
  color: var(--accent);
  font-weight: 500;
}

.nav-item .nav-icon {
  width: 16px;
  height: 16px;
  opacity: 0.7;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--border-dark);
}

.sidebar-footer-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: oklch(40% 0.02 250);
  letter-spacing: 0.15em;
  padding: 4px 12px 8px;
  text-transform: uppercase;
}

.lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 4px;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 5px 10px;
  border: 1px solid var(--border-dark);
  border-radius: var(--r-sm);
  background: transparent;
  color: oklch(62% 0.015 250);
  cursor: pointer;
  transition: all 0.15s;
}

.lang-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.lang-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.sidebar-footer-link {
  font-family: var(--font-mono);
  font-size: 10px;
  color: oklch(38% 0.02 250);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  transition: all 0.15s;
  margin-top: 6px;
}

.sidebar-footer-link:hover {
  color: oklch(60% 0.15 250);
  background: oklch(28% 0.02 250);
}

/* ── Main layout ─────────────────────────────────────────────────────── */
#main {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 32px 60px;
}

.page-header {
  padding: 8px 0 28px;
}

.page-header .header-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

/* ── Bento Cards ─────────────────────────────────────────────────────── */
.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 24px 28px;
  transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
}

.bento-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: 0 8px 24px oklch(52% 0.15 250 / 0.08);
}

/* About — Featured (dark navy) — span 2 columns */
.bento-card.featured {
  background: var(--bg-dark);
  border: none;
  color: oklch(96% 0.005 75);
  grid-column: span 2;
  position: relative;
  overflow: hidden;
  padding: 32px 36px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bento-card.featured::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(oklch(30% 0.02 250 / 0.3) 1px, transparent 1px),
    linear-gradient(90deg, oklch(30% 0.02 250 / 0.3) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.bento-card.featured > * { position: relative; }

.featured-tag {
  display: inline-flex;
  align-items: center;
  background: oklch(52% 0.15 250 / 0.2);
  border: 1px solid oklch(52% 0.15 250 / 0.4);
  border-radius: 4px;
  padding: 3px 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--accent);
  letter-spacing: 0.12em;
  font-weight: 500;
}

.bento-card.featured h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: oklch(96% 0.005 75);
  line-height: 1.4;
  margin-bottom: 12px;
}

.bento-card.featured p {
  font-family: var(--font-sans);
  font-size: 14px;
  color: oklch(72% 0.01 250);
  line-height: 1.7;
  font-weight: 300;
}

/* Warm card (skills) */
.bento-card.warm {
  background: linear-gradient(135deg, oklch(94% 0.025 55) 0%, oklch(96% 0.015 75) 100%);
  border: 1px solid oklch(88% 0.025 55);
}

.bento-card.warm .warm-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-warm);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: white;
}

/* Standard cards */
.bento-card h2 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.005em;
}

.bento-card p {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 300;
  color: var(--text-2);
  line-height: 1.7;
  overflow-wrap: break-word;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.15s;
}

a:hover {
  color: var(--accent-h);
}

.bento-card.featured a { color: oklch(75% 0.12 250); }
.bento-card.featured a:hover { color: oklch(85% 0.1 250); }

/* Skills tag-badges */
#skills-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
}

#skills-list li {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: 0.03em;
}

/* Stats card */
.stats-card {
  background: var(--bg-muted);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.stat-value {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

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

.stats-divider {
  height: 1px;
  background: var(--border);
}

/* Footer */
.site-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 980px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .bento-card.featured { grid-column: span 2; }
}

@media (max-width: 768px) {
  body { display: block; }
  #sidebar {
    position: relative;
    width: 100%;
    min-height: auto;
    flex-direction: column;
  }
  .sidebar-brand { padding: 16px 20px; }
  .sidebar-nav { padding: 8px 12px; flex-direction: row; flex-wrap: wrap; gap: 4px; }
  .nav-label { display: none; }
  .nav-item { width: auto; padding: 6px 10px; font-size: 12px; }
  .sidebar-footer { padding: 8px 12px; }
  .sidebar-footer-label { display: none; }
  #main { margin-left: 0; }
  .container { padding: 20px 16px 40px; }
  .bento { grid-template-columns: 1fr; }
  .bento-card.featured { grid-column: span 1; padding: 24px 22px; }
  .bento-card { padding: 20px 22px; }
}