/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* Dark mode (default) */
:root, [data-theme="dark"] {
  --bg: #26282D;
  --bg-sidebar: #1E2024;
  --bg-code: #1A1C20;
  --accent: #EBCB8B;
  --accent-hover: #F0D9A0;
  --text: #93979E;
  --text-bright: #C8CBD0;
  --heading: #FFFFFF;
  --border: #3A3D44;
  --glow-red: #8B3A3A;
  --glow-orange: #A05C2C;
  --code-fg: #A3BE8C;
}

/* Light mode — pure grayscale, newspaper/book vibe, zero color */
[data-theme="light"] {
  --bg: #ffffff;
  --bg-sidebar: #f5f5f5;
  --bg-code: #f0f0f0;
  --accent: #515151;
  --accent-hover: #1a1a1a;
  --text: #515151;
  --text-bright: #333333;
  --heading: #1a1a1a;
  --border: #e0e0e0;
  --glow-red: #cccccc;
  --glow-orange: #e0e0e0;
  --code-fg: #666666;
}

/* System mode: follow OS preference */
@media (prefers-color-scheme: light) {
  [data-theme="system"] {
    --bg: #ffffff;
    --bg-sidebar: #f5f5f5;
    --bg-code: #f0f0f0;
    --accent: #515151;
    --accent-hover: #1a1a1a;
    --text: #515151;
    --text-bright: #333333;
    --heading: #1a1a1a;
    --border: #e0e0e0;
    --glow-red: #cccccc;
    --glow-orange: #e0e0e0;
    --code-fg: #666666;
  }
}

:root {
  --sidebar-width: 280px;
  --content-max: 700px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  transition: transform var(--transition);
  min-height: 100vh;
}

/* ===== TOP GLOW (removed) ===== */

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  color: var(--heading);
  font-weight: 600;
  line-height: 1.3;
  margin: 1.5rem 0 0.75rem;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p { margin-bottom: 1.25rem; }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

strong, b { color: var(--text-bright); font-weight: 600; }
em, i { font-style: italic; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1.5rem 0;
  color: var(--text-bright);
  font-style: italic;
  background: rgba(128, 128, 128, 0.07);
  border-radius: 0 4px 4px 0;
}

ul, ol { padding-left: 1.5rem; margin-bottom: 1.25rem; }
li { margin-bottom: 0.25rem; }

/* ===== CODE ===== */
code {
  font-family: "SF Mono", "Fira Code", "Cascadia Code", Menlo, Monaco, monospace;
  font-size: 0.875em;
  background: var(--bg-code);
  color: var(--code-fg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ===== SIDEBAR TOGGLE (Checkbox Hack) ===== */
#sidebar-toggle { display: none; }

/* ===== HAMBURGER BUTTON ===== */
.hamburger {
  position: fixed;
  top: 1.1rem;
  left: 1.25rem;
  z-index: 900;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 4px;
  transition: background 0.2s;
}
.hamburger:hover { background: rgba(128, 128, 128, 0.15); }

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

#sidebar-toggle:checked ~ .hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
#sidebar-toggle:checked ~ .hamburger span:nth-child(2) { opacity: 0; transform: scaleX(0); }
#sidebar-toggle:checked ~ .hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== SIDEBAR ===== */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  transform: translateX(calc(-1 * var(--sidebar-width)));
  transition: transform var(--transition);
  z-index: 800;
  overflow-y: auto;
  padding: 4rem 2rem 2rem;
  display: flex;
  flex-direction: column;
}

#sidebar-toggle:checked ~ .sidebar { transform: translateX(0); }

/* Push body when sidebar opens */
#sidebar-toggle:checked ~ .site-wrapper { transform: translateX(var(--sidebar-width)); }

.sidebar-brand {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--heading);
  display: block;
  margin-bottom: 0.5rem;
}

.sidebar-brand a:hover { color: var(--accent); text-decoration: none; }

.sidebar-tagline {
  font-size: 0.8rem;
  color: var(--text);
  line-height: 1.4;
}

.sidebar-nav { flex: 1; }

.sidebar-nav-item {
  display: block;
  padding: 0.6rem 0;
  color: var(--text-bright);
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: color 0.2s, padding-left 0.2s;
}

.sidebar-nav-item:hover {
  color: var(--accent);
  padding-left: 0.5rem;
  text-decoration: none;
}

.sidebar-nav-item.active { color: var(--accent); }

.sidebar-social {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.sidebar-social a {
  font-size: 0.8rem;
  color: var(--text);
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

.sidebar-social a:hover { color: var(--accent); text-decoration: none; }

/* ===== SITE WRAPPER ===== */
.site-wrapper {
  transition: transform var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== MAIN CONTENT ===== */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 2rem;
  flex: 1;
}

/* ===== SITE HEADER ===== */
.site-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--heading);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.site-title a { color: inherit; }
.site-title a:hover { color: var(--accent); text-decoration: none; }

.site-tagline {
  font-size: 0.9rem;
  color: var(--text);
  margin: 0;
  line-height: 1.5;
}

/* ===== POST LIST ===== */
.post-list { list-style: none; padding: 0; }

.post-item {
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.post-item:last-child { border-bottom: none; }

.post-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
}

.post-title a { color: var(--heading); }
.post-title a:hover { color: var(--accent); text-decoration: none; }

.post-meta {
  font-size: 0.8rem;
  color: var(--text);
  text-transform: lowercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}

.post-summary {
  font-size: 0.95rem;
  color: var(--text-bright);
  margin: 0;
}

.read-more {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.read-more::after { content: " →"; }
.read-more:hover { text-decoration: none; color: var(--accent-hover); }

/* ===== SINGLE POST ===== */
.post-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-header .post-title { font-size: 2rem; margin: 0 0 0.5rem; }

.post-content { font-size: 1rem; }

.post-content h2 { border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }

.post-content img {
  max-width: 100%;
  border-radius: 6px;
  display: block;
  margin: 1.5rem auto;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.post-content th {
  background: var(--bg-code);
  color: var(--heading);
  padding: 0.6rem 0.75rem;
  text-align: left;
  border: 1px solid var(--border);
}

.post-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
}

/* ===== PAGINATION ===== */
.pagination {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.pagination a {
  font-size: 0.9rem;
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: 0.05em;
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text);
}

.site-footer a { color: var(--text-bright); }
.site-footer a:hover { color: var(--accent); text-decoration: none; }

/* ===== OVERLAY ===== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 700;
}

#sidebar-toggle:checked ~ .sidebar-overlay { display: block; }

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  .container { padding: 3rem 1rem 2rem; }
  .site-title { font-size: 1.8rem; }
  h1 { font-size: 1.6rem; }
  :root { --sidebar-width: 260px; }
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 4rem 0;
  color: var(--text);
}

.empty-state h2 { color: var(--text-bright); margin-bottom: 1rem; }

/* ===== THEME TRANSITIONS ===== */
body, .sidebar, .site-wrapper {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform var(--transition);
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-bright);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  white-space: nowrap;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(128,128,128,0.08);
}

.theme-toggle-icon { font-size: 1rem; line-height: 1; }
.theme-toggle-label { font-size: 0.75rem; text-transform: lowercase; letter-spacing: 0.06em; }