/* ── Theme Variables ── */

:root {
  --bg: #fff;
  --sidebar-bg: #f5f5f3;
  --border: #e8e8e6;
  --text: #1a1a1a;
  --muted: #888;
  --subtle: #555;
  --hover-bg: #ebebea;
  --active-bg: #e4e4e2;
  --card-bg: #f9f9f7;
  --tag-bg: #efefed;
  --code-bg: #eeeeed;
}

[data-theme="light"] {
  --bg: #fff;
  --sidebar-bg: #f5f5f3;
  --border: #e8e8e6;
  --text: #1a1a1a;
  --muted: #888;
  --subtle: #555;
  --hover-bg: #ebebea;
  --active-bg: #e4e4e2;
  --card-bg: #f9f9f7;
  --tag-bg: #efefed;
  --code-bg: #eeeeed;
}

[data-theme="dark"] {
  --bg: #0f0f0f;
  --sidebar-bg: #141414;
  --border: #272727;
  --text: #efefed;
  --muted: #525252;
  --subtle: #8e8e8e;
  --hover-bg: #1d1d1d;
  --active-bg: #242424;
  --card-bg: #141414;
  --tag-bg: #1d1d1d;
  --code-bg: #1d1d1d;
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg: #0f0f0f;
    --sidebar-bg: #141414;
    --border: #272727;
    --text: #efefed;
    --muted: #525252;
    --subtle: #8e8e8e;
    --hover-bg: #1d1d1d;
    --active-bg: #242424;
    --card-bg: #141414;
    --tag-bg: #1d1d1d;
    --code-bg: #1d1d1d;
  }
}

/* ── Base ── */

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  transition: background-color 0.2s, color 0.2s;
}

a { color: inherit; }

/* ── Mobile Nav wrapper (hidden on desktop) ── */

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

/* ── Mobile Header ── */

.mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--sidebar-bg);
  transition: background-color 0.2s, border-color 0.2s;
}

.mobile-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

/* ── Hamburger ── */

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4.5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ── Mobile Drawer ── */

.mobile-drawer {
  display: none;
  flex-direction: column;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.2s, border-color 0.2s;
}

@media (max-width: 700px) {
  .mobile-drawer.open { display: flex; }
}

.mobile-drawer a {
  padding: 13px 20px;
  font-size: 14px;
  color: var(--subtle);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s, color 0.1s;
}

.mobile-drawer a:hover { background: var(--hover-bg); color: var(--text); }

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

.drawer-theme {
  display: flex;
  gap: 6px;
  padding: 14px 20px;
}

/* ── Layout ── */

.container {
  display: grid;
  grid-template-columns: 210px 1fr;
  min-height: 100vh;
}

/* ── Sidebar ── */

.sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 28px 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background-color 0.2s, border-color 0.2s;
}

.nav {
  display: flex;
  flex-direction: column;
  padding: 0 16px;
}

.nav-name {
  font-size: 15px;
  font-weight: 500;
  margin: 0 0 28px 8px;
  color: var(--text);
}

.section-label {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 24px 0 6px 8px;
  display: block;
  transition: color 0.2s;
}

.nav a {
  text-decoration: none;
  color: var(--subtle);
  padding: 5px 8px;
  border-radius: 5px;
  display: block;
  transition: background 0.1s, color 0.1s;
}

.nav a:hover {
  background: var(--hover-bg);
  color: var(--text);
}

.nav a.active {
  background: var(--active-bg);
  color: var(--text);
}

/* ── Sidebar Footer ── */

.sidebar-footer {
  padding: 0 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-footer .section-label { margin: 0; }

.theme-toggle { display: flex; gap: 4px; }

.theme-btn {
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 5px 9px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.1s, color 0.1s, border-color 0.2s;
}

.theme-btn:hover { background: var(--hover-bg); color: var(--text); }
.theme-btn.active { background: var(--active-bg); color: var(--text); }

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #3fb950;
  flex-shrink: 0;
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

/* ── Main ── */

.main { min-width: 0; }

/* ── Hero ── */

.hero {
  padding: 52px 64px 48px;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 308px;
  gap: 52px;
  align-items: start;
  transition: border-color 0.2s;
}

.hero-content { min-width: 0; }

.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--subtle);
  margin-bottom: 16px;
}

.main-heading {
  font-size: 48px;
  font-weight: 400;
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.025em;
  color: var(--text);
  transition: color 0.2s;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--subtle);
  margin: -12px 0 20px;
  font-weight: 400;
}

.cursor {
  display: inline-block;
  color: var(--muted);
  animation: blink 1.1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.intro {
  color: var(--subtle);
  line-height: 1.7;
  max-width: 520px;
  margin: 0 0 24px;
  font-size: 15px;
  transition: color 0.2s;
}

.hero-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  padding: 8px 18px;
  background: var(--text);
  color: var(--bg);
  border-radius: 6px;
  font-size: 13px;
  text-decoration: none;
  transition: opacity 0.15s;
}

.btn-primary:hover { opacity: 0.8; }

.btn-secondary {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--border);
  color: var(--subtle);
  border-radius: 6px;
  font-size: 13px;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}

.btn-secondary:hover { border-color: var(--muted); color: var(--text); }

.hero-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
}

.meta-sep { opacity: 0.35; }

/* ── GitHub Panel ── */

.github-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  overflow: hidden;
  transition: border-color 0.2s, background-color 0.2s;
}

.github-panel-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: border-color 0.2s;
}

.github-panel-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.github-view-all {
  font-size: 11px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.1s;
}

.github-view-all:hover { color: var(--text); }

.commit-item {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 3px;
  transition: background 0.1s, border-color 0.2s;
}

.commit-item:last-child { border-bottom: none; }
.commit-item:hover { background: var(--hover-bg); }

.commit-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.commit-repo {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.03em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.commit-time {
  font-size: 10px;
  color: var(--muted);
  flex-shrink: 0;
}

.commit-msg {
  font-size: 12px;
  color: var(--subtle);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s;
}

.commits-loading,
.commits-empty {
  display: block;
  padding: 20px 16px;
  font-size: 12px;
  color: var(--muted);
}

/* ── Heatmap ── */

.heatmap-section {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--border);
  transition: border-color 0.2s;
}

.heatmap-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 9px;
}

.heatmap-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 3px;
}

.legend-text { font-size: 9px; color: var(--muted); }

.heatmap-grid { display: flex; gap: 2px; }
.heatmap-col  { display: flex; flex-direction: column; gap: 2px; }

.heatmap-cell {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--tag-bg);
  cursor: default;
}

.heatmap-cell[data-level="0"] { background: var(--tag-bg); }
.heatmap-cell[data-level="1"] { background: rgba(63, 185, 80, 0.30); }
.heatmap-cell[data-level="2"] { background: rgba(63, 185, 80, 0.60); }
.heatmap-cell[data-level="3"] { background: rgba(63, 185, 80, 0.90); }
.heatmap-cell[data-level="x"] { background: transparent; }

.heatmap-cell:not([data-level="x"]):hover {
  outline: 1px solid var(--muted);
  outline-offset: 1px;
}

/* ── Section Titles ── */

h4.section-title {
  font-size: 12px;
  font-weight: normal;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 28px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  transition: color 0.2s;
}

.label-accent {
  font-size: 32px;
  font-weight: 400;
  color: var(--border);
  line-height: 1;
  letter-spacing: -0.03em;
  text-transform: none;
  transition: color 0.2s;
}

/* ── Projects ── */

.projects-section {
  padding: 44px 64px 52px;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.2s;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  background: var(--card-bg);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.15s, background-color 0.2s;
}

.project-card:hover { border-color: var(--muted); }

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.project-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  transition: color 0.2s;
}

.project-category {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
  transition: color 0.2s;
}

.project-desc {
  font-size: 13px;
  color: var(--subtle);
  line-height: 1.65;
  margin: 0;
  flex: 1;
  transition: color 0.2s;
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.project-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.project-pill {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 10.5px;
  color: var(--subtle);
  background: var(--tag-bg);
  border: 1px solid var(--border);
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.02em;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.project-link {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 0.1s;
}

.project-link:hover { color: var(--text); }

/* ── Tech Stack ── */

.tech-section {
  padding: 56px 64px;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.2s;
}

.tech-categories {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.tech-category {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  align-items: start;
}

.tech-cat-label {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  padding-top: 6px;
  transition: color 0.2s;
}

.tech-cat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-tag {
  font-size: 12px;
  color: var(--subtle);
  background: var(--tag-bg);
  padding: 4px 11px;
  border-radius: 5px;
  border: 1px solid var(--border);
  cursor: default;
  transition: background 0.1s, color 0.1s, border-color 0.2s;
}

.tech-tag:hover { background: var(--hover-bg); color: var(--text); }

/* ── Footer ── */

.page-footer {
  padding: 24px 64px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  flex-wrap: wrap;
  transition: color 0.2s;
}

.footer-link {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.1s;
}

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

/* ── Responsive ── */

/* Tablet: compress hero columns */
@media (max-width: 1100px) {
  .hero { grid-template-columns: 1fr 280px; gap: 36px; }
}

/* Narrow: stack hero, tighten padding */
@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 48px 44px;
  }

  .github-panel { max-width: 480px; }

  .projects-section,
  .tech-section { padding: 40px 48px; }

  .page-footer { padding: 24px 48px; }
}

/* Mobile: hide sidebar, show mobile header, single column */
@media (max-width: 700px) {
  .mobile-nav { display: block; }

  body { padding-top: 53px; }

  .container { grid-template-columns: 1fr; }

  .sidebar { display: none; }

  .main-heading { font-size: 36px; }

  .hero,
  .projects-section,
  .tech-section { padding: 32px 20px; }

  .page-footer { padding: 20px 20px; }

  .hero-actions { flex-direction: column; align-items: flex-start; }

  .btn-primary,
  .btn-secondary { width: 100%; text-align: center; }

  .projects-grid { grid-template-columns: 1fr; }

  .tech-category { grid-template-columns: 1fr; gap: 8px; }

  .tech-cat-label { padding-top: 0; }
}