@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #1e1e1e;
  --bg-panel: #252526;
  --bg-elevated: #2d2d2d;
  --bg-hover: #323232;
  --primary: #569cd6;
  --accent: #4ec9b0;
  --text-main: #d4d4d4;
  --text-dim: #858585;
  --text-muted: #5a5a5a;
  --border-color: #333;
  --danger: #f44747;
  --success: #6a9955;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --font-sans: "Noto Sans TC", -apple-system, sans-serif;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-panel: #f6f8fa;
  --bg-elevated: #eef1f5;
  --bg-hover: #e8ecf0;
  --primary: #0366d6;
  --accent: #22863a;
  --text-main: #24292e;
  --text-dim: #586069;
  --text-muted: #959da5;
  --border-color: #e1e4e8;
  --danger: #cb2431;
  --success: #22863a;
}

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

body {
  background: var(--bg);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Layout */
.hub-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

/* Nav */
.apcs-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 14px;
  color: var(--text-main);
}

.nav-brand-icon {
  font-size: 18px;
  line-height: 1;
}

.nav-link {
  font-size: 13px;
  color: var(--text-dim);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
}

.nav-link:hover {
  color: var(--primary);
  text-decoration: none;
}

/* Header */
.apcs-header {
  padding: 1.5rem 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.apcs-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.apcs-header p {
  color: var(--text-dim);
  font-size: 14px;
}

/* Search */
.search-bar {
  width: 100%;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  border-radius: 3px;
  margin-bottom: 1.5rem;
  outline: none;
}

.search-bar::placeholder { color: var(--text-muted); }
.search-bar:focus { border-color: var(--primary); }

/* Post list (titles only on home page) */
.post-list-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-color);
}

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

.post-list-item a {
  font-size: 15px;
  color: var(--text-main);
  flex: 1;
}

.post-list-item a:hover { color: var(--primary); }

.post-list-meta {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.post-list-lang {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  background: rgba(78, 201, 176, 0.1);
  padding: 1px 6px;
  border-radius: 3px;
}

[data-theme="light"] .post-list-lang {
  background: rgba(34, 134, 58, 0.08);
}

.post-list-author, .post-author {
  font-size: 12px;
  color: var(--text-dim);
  font-style: italic;
}

/* Block editor */
.block-editor-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.25rem;
  margin-top: 0.5rem;
}

.md-hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.blocks-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.block-item {
  border: 1px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.block-type-code { border-left: 3px solid var(--accent); }
.block-type-text { border-left: 3px solid var(--primary); }

.block-item-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 4px 8px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-color);
  font-size: 12px;
}

.block-item-header select {
  width: auto;
  padding: 2px 6px;
  font-size: 11px;
  background: var(--bg-panel);
}

.block-type-badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 1px 6px;
  border-radius: 2px;
  letter-spacing: 0.5px;
}

.block-badge-code { background: rgba(78, 201, 176, 0.15); color: var(--accent); }
.block-badge-text { background: rgba(86, 156, 214, 0.15); color: var(--primary); }

.block-item-actions {
  margin-left: auto;
  display: flex;
  gap: 2px;
}

.block-item-actions button {
  background: none;
  border: 1px solid transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 13px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  padding: 0;
}

.block-item-actions button:hover:not(:disabled) { background: var(--bg-hover); color: var(--text-main); }
.block-item-actions button:disabled { opacity: 0.3; cursor: default; }

.block-remove-btn:hover:not(:disabled) { color: var(--danger) !important; }

.block-item textarea {
  border: none;
  border-radius: 0;
  resize: vertical;
}

/* Single post view */
.post-header {
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.post-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 13px;
  color: var(--text-dim);
}

.post-description {
  background: var(--bg-panel);
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--primary);
  margin-bottom: 1.25rem;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
  white-space: pre-wrap;
}

.post-ref-link {
  display: inline-block;
  font-size: 13px;
  color: var(--primary);
  margin-bottom: 1rem;
}

/* Rendered text block (markdown) */
.post-text-block {
  padding: 0.5rem 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-main);
}

.post-text-block p { margin-bottom: 0.75rem; }
.post-text-block p:last-child { margin-bottom: 0; }

.post-text-block h1, .post-text-block h2, .post-text-block h3 {
  margin: 1rem 0 0.5rem;
  color: var(--text-main);
}

.post-text-block h1 { font-size: 1.3rem; }
.post-text-block h2 { font-size: 1.15rem; }
.post-text-block h3 { font-size: 1rem; }

.post-text-block strong { color: var(--text-main); }

.post-text-block code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-elevated);
  padding: 2px 5px;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

.post-text-block pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 0.75rem;
  overflow-x: auto;
  margin: 0.75rem 0;
}

.post-text-block pre code {
  background: none;
  border: none;
  padding: 0;
}

.post-text-block blockquote {
  border-left: 3px solid var(--primary);
  padding: 0.25rem 0.75rem;
  margin: 0.75rem 0;
  color: var(--text-dim);
  background: var(--bg-panel);
}

.post-text-block ul, .post-text-block ol {
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
}

.post-text-block img {
  max-width: 100%;
  border-radius: 4px;
  margin: 0.5rem 0;
}

.post-text-block a { color: var(--primary); }
.post-text-block a:hover { text-decoration: underline; }

.post-text-block hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1rem 0;
}

/* Code Box */
.code-box {
  background: #1e1e1e;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  margin: 0.75rem 0;
  overflow: hidden;
}

[data-theme="light"] .code-box {
  background: #1e1e1e;
}

.code-header {
  background: #2d2d2d;
  padding: 6px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #333;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #858585;
}

.code-lang-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #858585;
  text-transform: uppercase;
}

pre {
  margin: 0;
  padding: 1rem;
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
}

pre code { font-family: var(--font-mono); }

/* Buttons */
.scifi-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  font-size: 13px;
  border-radius: 3px;
  cursor: pointer;
  font-family: var(--font-sans);
}

.scifi-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.scifi-btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.scifi-btn-primary:hover {
  opacity: 0.9;
  color: #fff;
}

/* Upload FAB */
.upload-trigger {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  background: var(--primary);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-trigger:hover { opacity: 0.85; }

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-content {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1.5rem;
  width: 100%;
  max-width: 640px;
  max-height: 90vh;
  overflow-y: auto;
}

/* Form */
.form-group { margin-bottom: 1rem; }

label {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dim);
}

input, textarea, select {
  width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  border-radius: 3px;
  outline: none;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--primary);
}

/* Utilities */
.hidden { display: none !important; }
.text-dim { color: var(--text-dim); }
.text-xs { font-size: 12px; }

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
  font-size: 14px;
}

/* Back link */
.back-link {
  display: inline-block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.back-link:hover { color: var(--primary); text-decoration: none; }

/* Responsive */
@media (max-width: 768px) {
  .hub-container { padding: 0 0.75rem 2rem; }
  .apcs-header h1 { font-size: 1.4rem; }
  .post-header h1 { font-size: 1.25rem; }
  .modal-content { padding: 1rem; }
  .grid-cols-2 { grid-template-columns: 1fr !important; }
}