/* ========================================
   Atomic Instructions — Design System
   ======================================== */

:root {
  /* Colors — Light */
  --bg: #fafaf9;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f5f5f4;
  --bg-prompt: #fef3c7;
  --bg-prompt-border: #f59e0b;
  --bg-user: var(--bg-surface);
  --bg-assistant: var(--bg-surface);
  --text: #1c1917;
  --text-secondary: #78716c;
  --text-muted: #a8a29e;
  --border: #e7e5e4;
  --border-strong: #d6d3d1;
  --accent: #f59e0b;
  --accent-hover: #d97706;
  --accent-text: #92400e;
  --tag-bg: #f5f5f4;
  --tag-text: #57534e;
  --upvote-bg: #fef3c7;
  --upvote-text: #92400e;
  --code-bg: #1e1e1e;
  --code-text: #d4d4d4;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --radius: 10px;
  --radius-sm: 6px;
  --max-width: 960px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09;
    --bg-surface: #1c1917;
    --bg-surface-hover: #292524;
    --bg-prompt: #451a03;
    --bg-prompt-border: #d97706;
    --bg-user: var(--bg-surface);
    --bg-assistant: var(--bg-surface);
    --text: #fafaf9;
    --text-secondary: #a8a29e;
    --text-muted: #78716c;
    --border: #292524;
    --border-strong: #44403c;
    --accent: #f59e0b;
    --accent-hover: #fbbf24;
    --accent-text: #fef3c7;
    --tag-bg: #292524;
    --tag-text: #d6d3d1;
    --upvote-bg: #451a03;
    --upvote-text: #fcd34d;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
  }
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  color: var(--accent-hover);
}

/* ========================================
   Layout
   ======================================== */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ========================================
   Header
   ======================================== */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
}

.logo-atom {
  display: inline-block;
  animation: atom-spin 4s linear infinite, atom-glow 2s ease-in-out infinite;
}

@keyframes atom-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes atom-glow {
  0%, 100% { text-shadow: 0 0 4px transparent; }
  50% { text-shadow: 0 0 8px var(--accent), 0 0 16px var(--accent); }
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: var(--font);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  background: var(--bg-surface-hover);
  color: var(--text);
  border-color: var(--border-strong);
}

/* ========================================
   Search & Filters
   ======================================== */

.site-tagline {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin: 24px 0 0;
}

.search-section {
  padding: 24px 0 16px;
}

.search-bar {
  position: relative;
  margin-bottom: 12px;
}

.search-bar input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-surface);
  color: var(--text);
  font-size: 0.9375rem;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.15s;
}

.search-bar input:focus {
  border-color: var(--accent);
}

.search-bar input::placeholder {
  color: var(--text-muted);
}

.search-bar svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

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

.tag-chip {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font);
}

.tag-chip:hover,
.tag-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ========================================
   Post Cards (Home)
   ======================================== */

.posts-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 48px;
}

.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  color: inherit;
  display: block;
}

.post-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  color: inherit;
}

.post-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.post-card-title {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.post-card-upvotes {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--upvote-bg);
  color: var(--upvote-text);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  flex-shrink: 0;
}

.post-card-prompt {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.post-card-model {
  padding: 2px 8px;
  background: var(--tag-bg);
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--tag-text);
  font-size: 0.75rem;
}

.post-card-tags {
  display: flex;
  gap: 4px;
}

.post-card-tag {
  padding: 2px 8px;
  background: var(--tag-bg);
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.post-card-date {
  margin-left: auto;
}

/* ========================================
   Post View (Single Post)
   ======================================== */

.post-view {
  padding: 32px 0 64px;
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 24px;
}

.post-back:hover {
  color: var(--text);
}

.post-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 12px;
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.post-meta .post-card-model {
  font-size: 0.8125rem;
}

/* Prompt Block */
.prompt-block {
  background: var(--bg-prompt);
  border-left: 4px solid var(--bg-prompt-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-bottom: 32px;
  position: relative;
}

.prompt-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-text);
}

.prompt-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  white-space: pre-wrap;
  font-family: var(--font);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--bg-prompt-border);
  border-radius: var(--radius-sm);
  color: var(--accent-text);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font);
}

.copy-btn:hover {
  background: var(--bg-prompt-border);
  color: #fff;
}

.copy-btn.copied {
  background: #16a34a;
  border-color: #16a34a;
  color: #fff;
}

/* Conversation Thread */
.conversation {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conversation-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.message {
  padding: 20px;
  border-radius: var(--radius);
  line-height: 1.7;
  border: 1px solid var(--border);
}

.message-role {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.message-user {
  background: var(--bg-user);
}

.message-user .message-role {
  color: #2563eb;
}

.message-assistant {
  background: var(--bg-assistant);
}

.message-assistant .message-role {
  color: #16a34a;
}

@media (prefers-color-scheme: dark) {
  .message-user .message-role { color: #93c5fd; }
  .message-assistant .message-role { color: #86efac; }
  .copy-btn.copied { background: #22c55e; border-color: #22c55e; }
}

.message-content {
  font-size: 0.9375rem;
}

/* Markdown content inside messages */
.message-content h1,
.message-content h2,
.message-content h3 {
  margin-top: 1.2em;
  margin-bottom: 0.5em;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child {
  margin-top: 0;
}

.message-content h2 { font-size: 1.1rem; }
.message-content h3 { font-size: 1rem; }

.message-content p {
  margin-bottom: 0.75em;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content ul, .message-content ol {
  margin: 0.5em 0;
  padding-left: 1.5em;
}

.message-content li {
  margin-bottom: 0.35em;
}

.message-content strong {
  font-weight: 600;
}

.message-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--tag-bg);
  padding: 2px 6px;
  border-radius: 4px;
}

.message-content pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 0.75em 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

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

.message-content table {
  border-collapse: collapse;
  margin: 0.75em 0;
  font-size: 0.875rem;
  width: 100%;
}

.message-content th,
.message-content td {
  padding: 6px 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.message-content th {
  font-weight: 600;
  background: var(--bg-surface-hover);
}

.message-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1em 0;
}

.message-content blockquote {
  border-left: 3px solid var(--border-strong);
  padding-left: 12px;
  color: var(--text-secondary);
  margin: 0.75em 0;
}

/* Upvote button on post view */
.post-actions {
  display: flex;
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.upvote-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font);
}

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

.upvote-btn.upvoted {
  background: var(--upvote-bg);
  border-color: var(--accent);
  color: var(--accent-text);
}

.share-buttons {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.share-btn {
  padding: 6px 8px !important;
  min-width: 0;
  color: var(--text-muted);
}

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

/* ========================================
   Comments
   ======================================== */

.comments-section {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.comments-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.comment-form {
  margin-bottom: 24px;
}

.comment-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text);
  font-size: 0.875rem;
  font-family: var(--font);
  outline: none;
  resize: vertical;
  min-height: 80px;
  line-height: 1.6;
  transition: border-color 0.15s;
  box-sizing: border-box;
}

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

.comment-form-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  justify-content: flex-end;
}

.comment {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.comment:last-child {
  border-bottom: none;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.comment-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  flex-shrink: 0;
}

.comment-avatar.deleted {
  background: var(--text-muted);
}

.comment-author {
  font-size: 0.8125rem;
  font-weight: 600;
}

.comment-author.deleted {
  color: var(--text-muted);
  font-weight: 400;
  font-style: italic;
}

.comment-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.comment-body {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 6px;
}

.comment-body p { margin-bottom: 0.5em; }
.comment-body p:last-child { margin-bottom: 0; }

.comment-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.comment-upvote-btn,
.comment-reply-btn,
.comment-delete-btn {
  background: none;
  border: none;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 4px;
  font-family: var(--font);
  transition: color 0.15s;
}

.comment-upvote-btn:hover,
.comment-reply-btn:hover {
  color: var(--accent);
}

.comment-upvote-btn.upvoted {
  color: var(--accent-text);
}

.comment-delete-btn:hover {
  color: #ef4444;
}

.comment-replies {
  margin-left: 24px;
  padding-left: 16px;
  border-left: 2px solid var(--border);
}

.comment-replies .comment {
  padding: 10px 0;
}

/* Cap visual indent at depth 4 */
.comment-replies .comment-replies .comment-replies .comment-replies .comment-replies {
  margin-left: 0;
  padding-left: 0;
  border-left: none;
}

.comment-reply-form-slot .comment-form {
  margin-top: 10px;
  margin-bottom: 0;
}

.comment-reply-form-slot .comment-input {
  min-height: 60px;
}

/* ========================================
   Submit Form
   ======================================== */

.submit-view {
  padding: 32px 0 64px;
}

.submit-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group .hint {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text);
  font-size: 0.9375rem;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.6;
}

.form-group textarea.tall {
  min-height: 200px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.tag-input-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  min-height: 44px;
  cursor: text;
  transition: border-color 0.15s;
}

.tag-input-container:focus-within {
  border-color: var(--accent);
}

.tag-input-container .tag-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--tag-text);
}

.tag-item button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 2px;
}

.tag-item button:hover {
  color: var(--text);
}

.tag-input-container input {
  flex: 1;
  min-width: 80px;
  border: none;
  padding: 4px 0;
  background: transparent;
  font-size: 0.875rem;
  outline: none;
}

/* Drop Zone */
.drop-zone-wrapper {
  padding: 48px 0 64px;
}

.drop-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius);
  padding: 64px 32px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--bg-surface);
  position: relative;
}

.drop-zone:hover {
  border-color: var(--accent);
  background: var(--bg-surface-hover);
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: var(--bg-prompt);
  border-style: solid;
  transform: scale(1.01);
}

.drop-zone-icon {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.drop-zone-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.drop-zone-hint {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 4px;
}

.drop-zone-or {
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin: 12px 0;
}

.drop-zone input[type="file"] {
  display: none;
}

.import-url-section {
  margin-top: 24px;
}

.import-url-divider {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.import-url-divider::before,
.import-url-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.import-url-form {
  display: flex;
  gap: 8px;
}

.import-url-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.15s ease;
}

.import-url-input:focus {
  border-color: var(--accent);
}

.import-url-input::placeholder {
  color: var(--text-muted);
}

.import-url-btn {
  white-space: nowrap;
}

.import-url-error {
  color: var(--danger, #e53e3e);
  font-size: 0.8125rem;
  margin-top: 6px;
  min-height: 1em;
}

.provider-hints {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 32px;
}

.provider-hint {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  text-align: left;
}

.provider-hint-name {
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.provider-hint-steps {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Submit Preview */
.submit-preview {
  padding: 32px 0 64px;
}

.submit-preview-header {
  margin-bottom: 24px;
}

.editable-title {
  width: 100%;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  border: none;
  border-bottom: 2px dashed var(--border);
  background: transparent;
  color: var(--text);
  padding: 8px 0;
  outline: none;
  font-family: var(--font);
  margin-bottom: 12px;
}

.editable-title:focus {
  border-bottom-color: var(--accent);
}

.preview-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.model-select-inline {
  padding: 2px 8px;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--tag-text);
  font-size: 0.8125rem;
  font-family: var(--font);
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%2378716c' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 24px;
}

.preview-tag-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.preview-tag-row .tag-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--tag-text);
}

.preview-tag-row .tag-item button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 2px;
}

.preview-tag-row .tag-item button:hover {
  color: var(--text);
}

.add-tag-input {
  border: none;
  background: transparent;
  font-size: 0.8125rem;
  color: var(--text);
  outline: none;
  padding: 2px 4px;
  width: 100px;
  font-family: var(--font);
}

.add-tag-input::placeholder {
  color: var(--text-muted);
}

.submit-actions {
  display: flex;
  gap: 8px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

/* ========================================
   Auth Pages
   ======================================== */

.auth-page {
  max-width: 400px;
  margin: 0 auto;
  padding: 64px 0;
}

.auth-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 28px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-form .form-group {
  margin-bottom: 0;
}

.auth-submit {
  width: 100%;
  justify-content: center;
  padding: 10px 16px;
  font-size: 0.9375rem;
  margin-top: 4px;
}

.auth-error {
  color: #ef4444;
  font-size: 0.8125rem;
  min-height: 1em;
}

.auth-switch {
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
}

/* ========================================
   User Menu
   ======================================== */

.user-menu {
  position: relative;
}

.user-menu-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px 4px 4px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  font-family: var(--font);
  color: var(--text);
  transition: all 0.15s;
}

.user-menu-btn:hover {
  border-color: var(--border-strong);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 600;
}

.user-name {
  font-size: 0.8125rem;
  font-weight: 500;
}

.user-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  min-width: 140px;
  z-index: 150;
  overflow: hidden;
}

.user-dropdown.open {
  display: block;
}

.user-dropdown-item {
  display: block;
  width: 100%;
  padding: 10px 16px;
  background: none;
  border: none;
  text-align: left;
  font-size: 0.875rem;
  font-family: var(--font);
  color: var(--text);
  cursor: pointer;
}

.user-dropdown-item:hover {
  background: var(--bg-surface-hover);
}

/* ========================================
   Post Author
   ======================================== */

.post-card-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
}

.post-card-author {
  font-weight: 500;
  color: var(--text-secondary);
}

.post-author {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.post-author-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* ========================================
   Empty State
   ======================================== */

.empty-state {
  text-align: center;
  padding: 64px 20px;
  color: var(--text-muted);
}

.empty-state svg {
  margin-bottom: 16px;
  color: var(--border-strong);
}

.empty-state p {
  font-size: 0.9375rem;
  margin-bottom: 4px;
}

/* ========================================
   Toast
   ======================================== */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 300;
  transition: transform 0.3s ease;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 640px) {
  .header-inner {
    height: 52px;
  }

  .post-title {
    font-size: 1.375rem;
  }

  .post-card {
    padding: 16px;
  }

  .prompt-block {
    padding: 16px;
  }

  .message {
    padding: 16px;
  }

  .drop-zone {
    padding: 48px 20px;
  }

  .provider-hints {
    grid-template-columns: 1fr;
  }

  .comment-replies {
    margin-left: 12px;
    padding-left: 10px;
  }
}

/* ========================================
   LLM Feature Styles
   ======================================== */

.btn-sm {
  padding: 4px 10px;
  font-size: 0.75rem;
  gap: 4px;
}

.title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.title-row .editable-title {
  flex: 1;
  margin-bottom: 0;
}

.insights-section {
  margin-top: 24px;
}

.insights-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.insights-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.insights-row {
  margin-bottom: 12px;
}

.insights-row:last-child {
  margin-bottom: 0;
}

.insights-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.insights-techniques {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.insights-score {
  color: var(--accent);
  font-size: 1.125rem;
  letter-spacing: 2px;
}

.insights-score-num {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  letter-spacing: normal;
}

.insights-suggestion {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.provider-hint-name a {
  color: var(--text);
  text-decoration: none;
}

.provider-hint-name a:hover {
  color: var(--accent);
}