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

/* ===== Variables ===== */
:root {
  --bg: #0a0a0f;
  --bg-card: #12121a;
  --bg-card-hover: #1a1a26;
  --border: #2a2a3a;
  --text: #c8c8d0;
  --text-muted: #6a6a7a;
  --accent: #e2b340;
  --accent-dim: #b8922e;
  --tag-bg: #1a1a2a;
  --tag-active: #e2b340;
  --tag-active-text: #0a0a0f;
  --code-bg: #0d0d14;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --max-width: 960px;
}

/* ===== Base ===== */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.site-header h1 {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.site-header h1 a {
  color: var(--accent);
}
.site-header h1 a:hover {
  color: #fff;
}

.site-header .subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-family: var(--font-mono);
}

/* ===== Index Layout ===== */
.index-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 720px) {
  .index-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ===== Tags Sidebar ===== */
.tag-sidebar {
  position: sticky;
  top: 24px;
}

.tag-sidebar h2 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-pill {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: var(--tag-bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.tag-pill:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.tag-pill.active {
  background: var(--tag-active);
  color: var(--tag-active-text);
  border-color: var(--tag-active);
}

/* ===== Post List ===== */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  transition: all 0.2s;
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.post-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-dim);
  transform: translateY(-1px);
}

.post-card .post-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.post-card h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #e8e8f0;
  margin-bottom: 8px;
  line-height: 1.4;
}

.post-card .post-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.post-card .post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.post-card .post-tags .tag-pill {
  cursor: default;
  font-size: 0.7rem;
  padding: 2px 8px;
}

/* ===== Single Post ===== */
.post-header {
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.post-header .back-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: inline-block;
}
.post-header .back-link:hover {
  color: var(--accent);
}

.post-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: #e8e8f0;
  line-height: 1.3;
  margin-bottom: 12px;
}

.post-header .post-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.post-header .post-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Post Content ===== */
.post-content {
  font-size: 1rem;
  line-height: 1.8;
}

.post-content p {
  margin-bottom: 1.2em;
}

.post-content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  color: #e8e8f0;
  margin: 2em 0 0.8em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 8px 20px;
  margin: 1.2em 0;
  background: rgba(226, 179, 64, 0.04);
  color: var(--accent);
  font-style: italic;
}

.post-content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 1.2em 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
}

.post-content pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: inherit;
}

.post-content code {
  font-family: var(--font-mono);
  background: var(--tag-bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.85em;
  color: #e8c8e8;
}

.post-content strong {
  color: #e8e8f0;
  font-weight: 600;
}

.post-content em {
  color: #b8b8c8;
}

/* ASCII art & audit report */
.post-content .audit-report pre,
.post-content pre code.language-text {
  color: var(--accent);
  font-size: 0.9rem;
  line-height: 1.5;
}

.post-content .audit-report {
  margin: 1.2em 0;
}

/* ===== KaTeX ===== */
.katex-display {
  margin: 1.2em 0;
  overflow-x: auto;
}

/* ===== Footer ===== */
.site-footer {
  margin-top: 64px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 48px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== Selection ===== */
::selection {
  background: var(--accent);
  color: var(--bg);
}

/* ===== Editor ===== */
.editor-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 28px;
  margin-bottom: 24px;
}

.editor-card h2 {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 16px;
}

.editor-card .hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.editor-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.editor-meta strong {
  color: var(--accent);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.flex-1 {
  flex: 1;
}

.input-full {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.input-full:focus {
  border-color: var(--accent-dim);
}

textarea.input-full {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  resize: vertical;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  padding: 8px 18px;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  font-weight: 700;
}

.btn-primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
}

.btn-link {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

.btn-link:hover {
  color: var(--accent);
}

.status-msg {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.status-msg.success {
  color: #4caf50;
}

.status-msg.error {
  color: #f44336;
}

/* ===== Post Management ===== */
.post-list-manage {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.post-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 0.2s;
}

.post-item:hover {
  border-color: var(--accent-dim);
}

.post-item-info {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1;
}

.post-item-title {
  font-weight: 600;
  color: #e8e8f0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.post-item-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.post-item-tags {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.post-item-actions {
  display: flex;
  gap: 6px;
  margin-left: 12px;
  flex-shrink: 0;
}

.btn-edit {
  font-size: 0.75rem;
  padding: 4px 12px;
}

.btn-delete {
  font-size: 0.75rem;
  padding: 4px 12px;
  color: #f44336;
  border-color: #f4433640;
}

.btn-delete:hover {
  background: #f4433620;
  border-color: #f44336;
}