:root {
  --bg:            #F9F5F0;
  --sidebar-bg:    #FFFFFF;
  --card-bg:       #FFFFFF;
  --text:          #1A1816;
  --muted:         #5D5550;
  --subtle:        #8C857E;
  --accent:        #DA7756;
  --accent-hover:  #C4674A;
  --accent-soft:   rgba(218, 119, 86, 0.10);
  --border:        #E8E0D8;
  --border-strong: #D5CCC3;
  --input-bg:      #F4EEE8;
  --shadow-sm:     0 1px 2px rgba(0,0,0,.04);
  --shadow:        0 2px 8px rgba(0,0,0,.06), 0 0 1px rgba(0,0,0,.08);
  --shadow-lg:     0 4px 24px rgba(0,0,0,.08), 0 0 1px rgba(0,0,0,.1);
  --radius:        14px;
  --radius-sm:     8px;
  --radius-xs:     6px;
  --sidebar-w:     260px;
  --transition:    0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg:            #1C1917;
  --sidebar-bg:    #141211;
  --card-bg:       #231F1C;
  --text:          #F0EBE5;
  --muted:         #B0A99F;
  --subtle:        #78716C;
  --accent:        #E08A6A;
  --accent-hover:  #D47A5A;
  --accent-soft:   rgba(224, 138, 106, 0.14);
  --border:        #302B27;
  --border-strong: #44403C;
  --input-bg:      #292524;
  --shadow-sm:     0 1px 2px rgba(0,0,0,.2);
  --shadow:        0 2px 8px rgba(0,0,0,.25), 0 0 1px rgba(0,0,0,.3);
  --shadow-lg:     0 4px 24px rgba(0,0,0,.35), 0 0 1px rgba(0,0,0,.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { height: 100%; scroll-behavior: smooth; }
body {
  height: 100%;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

.layout { display: flex; min-height: 100vh; }

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  overflow-y: auto;
  z-index: 100;
  transition: background var(--transition), border-color var(--transition), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-header {
  padding: 18px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  transition: border-color var(--transition);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  min-width: 0;
}
.sidebar-logo:hover { color: var(--text); }

.sidebar-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 17px;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(218, 119, 86, 0.3);
}

.sidebar-logo-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--text);
  line-height: 1.2;
  white-space: nowrap;
}

.sidebar-logo-sub {
  font-size: 11.5px;
  color: var(--subtle);
  font-weight: 400;
  margin-top: 1px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--subtle);
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  padding: 0;
}
.theme-toggle:hover {
  background: var(--input-bg);
  color: var(--text);
  border-color: var(--border-strong);
}
.theme-toggle svg { width: 16px; height: 16px; display: block; }

.sidebar-nav { padding: 14px 10px; flex: 1; }

.nav-section-label {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--subtle);
  padding: 6px 10px 6px;
  margin-top: 4px;
}
.nav-section-label:first-child { margin-top: 0; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--transition);
  margin-bottom: 1px;
}
.nav-link:hover {
  background: var(--input-bg);
  color: var(--text);
}
.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}
.nav-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  opacity: 0.55;
  transition: opacity var(--transition);
}
.nav-link:hover svg, .nav-link.active svg { opacity: 1; }

.sidebar-footer {
  padding: 16px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--subtle);
  line-height: 1.8;
  transition: border-color var(--transition);
}
.sidebar-footer a { color: var(--subtle); }
.sidebar-footer a:hover { color: var(--accent); }

/* ===== MOBILE MENU ===== */
.mobile-header {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  z-index: 90;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  transition: background var(--transition), border-color var(--transition);
}

.mobile-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 14px;
}
.mobile-logo:hover { color: var(--text); }

.mobile-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 15px;
}

.hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.hamburger:hover { background: var(--input-bg); }
.hamburger svg { width: 22px; height: 22px; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.3s;
}
.sidebar-overlay.active { display: block; opacity: 1; }

/* ===== MAIN ===== */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  display: flex;
  flex-direction: column;
  transition: margin var(--transition);
}
.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 40px 80px;
  width: 100%;
}

/* ===== HERO ===== */
.hero { margin-bottom: 40px; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
  padding: 4px 12px;
  background: var(--accent-soft);
  border-radius: 999px;
}

.hero h1 {
  font-size: 30px;
  font-weight: 750;
  line-height: 1.22;
  color: var(--text);
  margin-bottom: 14px;
  letter-spacing: -0.4px;
}

.hero p {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 640px;
}

.badges { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  transition: all var(--transition);
}
.badge:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.section-label {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--subtle);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===== GRID & CARDS ===== */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-bottom: 36px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  opacity: 0;
  transition: opacity var(--transition);
}
.card:hover {
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}
.card:hover::before { opacity: 1; }

.card-eyebrow {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  margin-bottom: 8px;
}

.card h3 {
  font-size: 16px;
  font-weight: 650;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.3;
}
.card .meta {
  font-size: 12px;
  color: var(--subtle);
  margin-bottom: 12px;
  font-family: ui-monospace, "Cascadia Code", Menlo, Monaco, Consolas, monospace;
}
.card p {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.7;
  flex: 1;
}
.card .actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ===== CONTENT CARD ===== */
.content-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 32px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.content-card h2 {
  font-size: 17px;
  font-weight: 650;
  color: var(--text);
  margin: 28px 0 10px;
  letter-spacing: -0.2px;
}
.content-card h2:first-child { margin-top: 0; }
.content-card p {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 10px;
}
.content-card ul {
  padding-left: 20px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.75;
}
.content-card ul li { margin-bottom: 8px; }
.content-card .actions {
  display: flex;
  gap: 8px;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn:hover {
  background: var(--input-bg);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 1px 4px rgba(218, 119, 86, 0.25);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 2px 8px rgba(218, 119, 86, 0.35);
  color: #fff;
}

.divider { height: 1px; background: var(--border); margin: 24px 0; }

img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

code {
  font-size: 12.5px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 2px 6px;
  color: var(--accent);
  font-family: ui-monospace, "Cascadia Code", Menlo, Monaco, Consolas, monospace;
}

strong { color: var(--text); font-weight: 600; }

/* ===== GITHUB LIVE SECTION ===== */
.github-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
}

.github-repo {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.github-repo:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
  color: var(--text);
}

.github-repo-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
}
.github-repo-name svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

.github-repo-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
  flex: 1;
}

.github-repo-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11.5px;
  color: var(--subtle);
}

.lang-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 4px;
}

/* Language colors */
.lang-java { background: #b07219; }
.lang-typescript { background: #3178c6; }
.lang-javascript { background: #f1e05a; }
.lang-python { background: #3572A5; }
.lang-html { background: #e34c26; }
.lang-css { background: #563d7c; }

/* ===== FADE IN ANIMATION ===== */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes fadeIn {
  to { opacity: 1; transform: translateY(0); }
}
.fade-in:nth-child(1) { animation-delay: 0s; }
.fade-in:nth-child(2) { animation-delay: 0.05s; }
.fade-in:nth-child(3) { animation-delay: 0.1s; }
.fade-in:nth-child(4) { animation-delay: 0.15s; }
.fade-in:nth-child(5) { animation-delay: 0.2s; }
.fade-in:nth-child(6) { animation-delay: 0.25s; }
.fade-in:nth-child(7) { animation-delay: 0.3s; }
.fade-in:nth-child(8) { animation-delay: 0.35s; }
.fade-in:nth-child(9) { animation-delay: 0.4s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }
  .mobile-header { display: flex; }
  .main { margin-left: 0; padding-top: 56px; }
  .page { padding: 28px 18px 60px; }
  .hero h1 { font-size: 24px; }
  .hero p { font-size: 15px; }
  .grid { grid-template-columns: 1fr; }
  .github-grid { grid-template-columns: 1fr; }
  .content-card { padding: 22px 20px; }
}