:root {
  --bg-primary: #f5f5f0;
  --bg-secondary: #eaeae4;
  --bg-tertiary: #dfdfd7;
  --bg-card: #fdfdfa;
  --bg-code: #eaeae4;

  --border-color: #24292f;
  --border-subtle: #8c959f;

  --text-primary: #121417;
  --text-secondary: #32383f;
  --text-muted: #57606a;
  --text-accent: #0f766e;

  --accent-color: #0f766e;
  --accent-subtle: #ccfbf1;
  --accent-border: #0f766e;
  --btn-primary-text: #ffffff;

  /* Status Badges */
  --status-active-bg: #ccfbf1;
  --status-active-text: #0f766e;
  --status-maint-bg: #fef3c7;
  --status-maint-text: #92400e;
  --status-exp-bg: #ede9fe;
  --status-exp-text: #6b21a8;

  /* Changelog Tag Badges */
  --tag-feat-bg: #ccfbf1;
  --tag-feat-text: #0f766e;
  --tag-fix-bg: #fee2e2;
  --tag-fix-text: #b91c1c;
  --tag-perf-bg: #e0f2fe;
  --tag-perf-text: #0369a1;
  --tag-refactor-bg: #fef3c7;
  --tag-refactor-text: #92400e;
  --tag-infra-bg: #ede9fe;
  --tag-infra-text: #6b21a8;

  /* Typography & Layout */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --content-max-width: 840px;
  --transition-fast: 0.15s ease;
}

/* --- Base & Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; border-radius: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
a { color: var(--text-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: var(--font-mono); font-size: 0.875rem; }
.container { width: 100%; max-width: var(--content-max-width); margin: 0 auto; padding: 0 1.5rem; }

/* --- Header & Navigation --- */
.site-header { border-bottom: 1px solid var(--border-color); background-color: var(--bg-primary); position: sticky; top: 0; z-index: 100; }
.nav-wrapper { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.site-brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 600; font-size: 1.05rem; color: var(--accent-color); text-decoration: none; }
.site-brand .brand-badge { font-family: var(--font-mono); font-size: 0.75rem; background-color: var(--bg-secondary); border: 1px solid var(--border-color); padding: 2px 6px; color: var(--text-secondary); }
.nav-links { display: flex; align-items: center; list-style: none; gap: 0.25rem; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; padding: 0.4rem 0.75rem; transition: all var(--transition-fast); }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); background-color: var(--bg-secondary); text-decoration: none; }
.nav-links a.active { color: var(--accent-color); font-weight: 600; box-shadow: inset 0 -2px 0 var(--accent-color); }
.nav-controls { display: flex; align-items: center; gap: 0.5rem; }
.theme-toggle-btn { background: transparent; border: 1px solid var(--border-color); color: var(--text-secondary); padding: 6px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all var(--transition-fast); }
.theme-toggle-btn:hover { color: var(--text-primary); background-color: var(--bg-secondary); }
.theme-toggle-btn svg { width: 17px; height: 17px; }

/* --- Page Header & Main --- */
main { flex: 1; padding: 2.5rem 0 4rem; }
.page-header { margin-bottom: 2.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border-subtle); }
.page-title { font-size: 1.85rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.5rem; color: var(--accent-color); }
.page-description { font-size: 1.05rem; color: var(--text-secondary); max-width: 650px; }

/* --- Hero Section --- */
.hero-section { margin-bottom: 3rem; }
.hero-tag { display: inline-flex; align-items: center; gap: 0.4rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-secondary); background-color: var(--bg-secondary); border: 1px solid var(--border-color); padding: 3px 8px; margin-bottom: 1rem; }
.status-dot { width: 7px; height: 7px; background-color: var(--accent-color); border-radius: 50%; }
.hero-bio { font-size: 1.15rem; line-height: 1.7; color: var(--text-primary); margin-bottom: 1.25rem; }
.hero-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem; font-size: 0.9rem; color: var(--text-secondary); }
.hero-meta-item { display: inline-flex; align-items: center; gap: 0.4rem; }
.hero-meta-item svg { width: 16px; height: 16px; color: var(--text-muted); }

/* --- Buttons & Links --- */
.action-links { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.875rem; font-weight: 600; padding: 0.5rem 0.9rem; border: 1px solid var(--border-color); background-color: var(--bg-secondary); color: var(--text-primary); cursor: pointer; transition: all var(--transition-fast); }
.btn:hover { background-color: var(--bg-tertiary); text-decoration: none; }
.btn.btn-primary { background-color: var(--accent-color); border-color: var(--accent-color); color: var(--btn-primary-text); }
.btn.btn-primary:hover { filter: brightness(1.1); }
.btn svg { width: 15px; height: 15px; }

/* --- Sections --- */
.section { margin-bottom: 3rem; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 1.25rem; border-bottom: 1px solid var(--border-subtle); padding-bottom: 0.5rem; }
.section-title { font-size: 1.1rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; font-family: var(--font-mono); }
.section-link { font-size: 0.85rem; font-weight: 500; color: var(--text-accent); }

/* --- Projects & Filter --- */
.filter-bar { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.75rem; }
.filter-btn { font-family: var(--font-mono); font-size: 0.8rem; padding: 4px 10px; border: 1px solid var(--border-color); background-color: var(--bg-primary); color: var(--text-secondary); cursor: pointer; transition: all var(--transition-fast); }
.filter-btn:hover { color: var(--text-primary); background-color: var(--bg-secondary); }
.filter-btn.active { color: var(--accent-color); background-color: var(--accent-subtle); border-color: var(--accent-border); font-weight: 600; }
.projects-grid { display: flex; flex-direction: column; gap: 1.25rem; }
.project-card { border: 1px solid var(--border-color); border-left: 3px solid var(--accent-color); background-color: var(--bg-card); padding: 1.35rem 1.5rem; scroll-margin-top: 5rem; transition: background-color var(--transition-fast), border-color var(--transition-fast); }
.project-card:hover { background-color: var(--bg-secondary); border-color: var(--text-secondary); }
.project-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 0.6rem; }
.project-name-group { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.project-name { font-size: 1.15rem; font-weight: 600; color: var(--accent-color); margin: 0; }
.project-name a { color: inherit; }
.project-links { display: flex; align-items: center; gap: 0.85rem; }
.project-link-item { color: var(--text-secondary); display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.85rem; font-family: var(--font-mono); }
.project-link-item:hover { color: var(--text-accent); }
.project-link-item svg { width: 14px; height: 14px; }
.project-desc { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.55; margin-bottom: 0.9rem; }
.project-details { background-color: var(--bg-secondary); border: 1px solid var(--border-subtle); padding: 0.75rem 1rem; font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.9rem; }
.project-details ul { padding-left: 1.25rem; margin-top: 0.35rem; }
.project-details li { margin-bottom: 0.25rem; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tech-tag { font-family: var(--font-mono); font-size: 0.75rem; padding: 2px 7px; background-color: var(--bg-secondary); border: 1px solid var(--border-color); color: var(--text-secondary); }

/* --- Badges --- */
.badge-status { display: inline-flex; align-items: center; gap: 0.35rem; font-family: var(--font-mono); font-size: 0.725rem; font-weight: 500; padding: 2px 7px; text-transform: capitalize; }
.badge-status::before { content: ""; display: inline-block; width: 6px; height: 6px; border-radius: 50%; }
.badge-status.active { background-color: var(--status-active-bg); color: var(--status-active-text); }
.badge-status.active::before { background-color: var(--status-active-text); }
.badge-status.maintained { background-color: var(--status-maint-bg); color: var(--status-maint-text); }
.badge-status.maintained::before { background-color: var(--status-maint-text); }
.badge-status.experimental { background-color: var(--status-exp-bg); color: var(--status-exp-text); }
.badge-status.experimental::before { background-color: var(--status-exp-text); }

.badge-tag { display: inline-block; font-family: var(--font-mono); font-size: 0.7rem; font-weight: 600; padding: 1px 5px; margin-right: 0.4rem; text-transform: uppercase; letter-spacing: 0.03em; }
.badge-tag.feat { background-color: var(--tag-feat-bg); color: var(--tag-feat-text); }
.badge-tag.fix { background-color: var(--tag-fix-bg); color: var(--tag-fix-text); }
.badge-tag.perf { background-color: var(--tag-perf-bg); color: var(--tag-perf-text); }
.badge-tag.refactor { background-color: var(--tag-refactor-bg); color: var(--tag-refactor-text); }
.badge-tag.infra { background-color: var(--tag-infra-bg); color: var(--tag-infra-text); }

/* --- Changelog & Timeline --- */
.changelog-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin-bottom: 2rem; }
.stat-box { background-color: var(--bg-secondary); border: 1px solid var(--border-color); padding: 0.85rem 1.1rem; }
.stat-label { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 0.25rem; }
.stat-value { font-family: var(--font-mono); font-size: 1.35rem; font-weight: 700; color: var(--text-primary); }
.timeline { position: relative; border-left: 2px solid var(--border-color); margin-left: 0.5rem; padding-left: 1.5rem; display: flex; flex-direction: column; gap: 2.25rem; }
.timeline-entry { position: relative; }
.timeline-entry::before { content: ""; position: absolute; left: calc(-1.5rem - 6px); top: 6px; width: 10px; height: 10px; border-radius: 50%; background-color: var(--bg-primary); border: 2px solid var(--accent-color); }
.entry-header { display: flex; align-items: baseline; gap: 0.75rem; margin-bottom: 0.4rem; flex-wrap: wrap; }
.entry-version { font-family: var(--font-mono); font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }
.entry-project { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent-color); background-color: var(--accent-subtle); border: 1px solid var(--accent-border); padding: 1px 6px; }
.entry-date { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-muted); margin-left: auto; }
.entry-title { font-size: 1.05rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.5rem; }
.entry-content { color: var(--text-secondary); font-size: 0.925rem; line-height: 1.6; }
.entry-content ul { list-style-type: none; display: flex; flex-direction: column; gap: 0.35rem; }
.entry-content li { position: relative; padding-left: 1.25rem; }
.entry-content li::before { content: "–"; position: absolute; left: 0; color: var(--text-muted); }

/* --- Recent Updates (Home) --- */
.recent-updates-list { display: flex; flex-direction: column; gap: 1rem; }
.update-row { display: flex; align-items: baseline; gap: 1rem; padding: 0.85rem 1rem; background-color: var(--bg-secondary); border: 1px solid var(--border-color); font-size: 0.9rem; }
.update-date { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-muted); flex-shrink: 0; width: 90px; }
.update-content { flex: 1; color: var(--text-primary); }
.update-project { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-secondary); background-color: var(--bg-tertiary); padding: 2px 6px; margin-right: 0.5rem; }

/* --- Footer --- */
.site-footer { border-top: 1px solid var(--border-color); padding: 2.5rem 0; background-color: var(--bg-secondary); font-size: 0.85rem; color: var(--text-secondary); margin-top: auto; }
.footer-content { display: flex; flex-direction: column; gap: 1.25rem; }
.footer-row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-nav { display: flex; gap: 1.25rem; list-style: none; }
.footer-nav a { color: var(--text-secondary); }
.footer-nav a:hover { color: var(--text-primary); }
.footer-item { display: inline-flex; align-items: center; gap: 0.4rem; }
.footer-item svg { width: 16px; height: 16px; color: var(--text-muted); flex-shrink: 0; position: relative; top: -2px; }
.footer-colophon { font-family: var(--font-mono); font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; }

/* --- Responsive --- */
@media (max-width: 640px) {
  .nav-wrapper { flex-wrap: wrap; height: auto; padding: 0.75rem 0; gap: 0.75rem; }
  .nav-links { order: 3; width: 100%; justify-content: flex-start; border-top: 1px solid var(--border-subtle); padding-top: 0.5rem; }
  .project-top { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .update-row { flex-direction: column; gap: 0.35rem; }
  .update-date { width: auto; }
  .entry-header { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .entry-date { margin-left: 0; }
  .timeline { margin-left: 0.25rem; padding-left: 1.25rem; }
  .timeline-entry::before { left: calc(-1.25rem - 6px); }
}