/* ====== Dark Theme (GitHub-inspired) ====== */
:root,
[data-theme="dark"] {
  --bg: #0d1117;
  --bg-secondary: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --border: #30363d;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  --card-bg: #161b22;
  --radius: 6px;
  --max: 900px;
}

/* ====== Light Theme (GitHub-inspired) ====== */
[data-theme="light"] {
  --bg: #ffffff;
  --bg-secondary: #f6f8fa;
  --text: #1f2328;
  --muted: #656d76;
  --accent: #0969da;
  --border: #d0d7de;
  --shadow: 0 8px 24px rgba(140, 149, 159, 0.2);
  --card-bg: #f6f8fa;
}

/* ====== Base ====== */
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

/* ====== Skip Link (Accessibility) ====== */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  top: 0;
}

/* ====== Layout ====== */
.container {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

/* ====== Header ====== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.4px;
  white-space: nowrap;
}

/* ====== Form Elements ====== */
.input {
  flex: 1;
  min-width: 0;
  padding: 5px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.875rem;
  outline: none;
}

.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.3);
}

[data-theme="light"] .input:focus {
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.3);
}

/* ====== Theme Toggle ====== */
.theme-toggle {
  flex-shrink: 0;
  padding: 0.5rem;
  font-size: 1.1rem;
  cursor: pointer;
}

.theme-icon {
  display: block;
  line-height: 1;
}

/* ====== Main Content ====== */
.main {
  flex: 1;
  padding: 1.25rem 0 2.5rem;
}

/* ====== Cards ====== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

/* ====== Typography ====== */
.h1 {
  font-size: 2rem;
  margin: 0 0 0.6rem;
}
.h2 {
  font-size: 1.25rem;
  margin: 0 0 0.35rem;
}
.muted {
  color: var(--muted);
}
.small {
  font-size: 0.9rem;
}

.hr {
  height: 1px;
  background: var(--border);
  margin: 0.9rem 0;
}

/* ====== Post Meta ====== */
.post-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

/* ====== Grid ====== */
.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* ====== Tag Filter ====== */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

/* ====== Badges ====== */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.5rem;
  border-radius: 2em;
  border: 1px solid transparent;
  color: var(--accent);
  background: rgba(88, 166, 255, 0.15);
}

[data-theme="light"] .badge {
  background: rgba(9, 105, 218, 0.1);
}

.badge--clickable {
  cursor: pointer;
  transition: all 0.2s ease;
}

.badge--clickable:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

.badge--clear {
  cursor: pointer;
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

.badge--clear:hover {
  background: rgba(239, 68, 68, 0.25);
}

/* ====== Buttons ====== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn:hover {
  background: var(--border);
  border-color: var(--muted);
}

/* ====== Footer ====== */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  background: var(--bg);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* ====== Code Blocks ====== */
pre,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", monospace;
}

pre {
  background: var(--bg-secondary);
  color: var(--text);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow-x: auto;
  line-height: 1.45;
}

code {
  background: rgba(110, 118, 129, 0.4);
  padding: 0.2em 0.4em;
  border-radius: var(--radius);
  font-size: 85%;
}

[data-theme="light"] code {
  background: rgba(175, 184, 193, 0.4);
}

/* ====== Responsive ====== */
@media (max-width: 480px) {
  .topbar__inner {
    flex-wrap: wrap;
  }

  .input {
    order: 3;
    width: 100%;
    margin-top: 0.5rem;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}