:root{
  --bg:#f7f7f5;
  --fg:#1d1d1d;
  --muted:#6b6b6b;
  --accent:#1d1d1d;
  --card:#ffffff;
  --border:#e6e6e0;
  --nav-bg:#fafaf8;
  --hover-bg:#f2f2f0;
  --shadow-light:rgba(0,0,0,.04);
  --shadow-heavy:rgba(0,0,0,.05);
  --error-bg:#fff3f3;
  --error-border:#ffdddd;
  --error-text:#8b0000;
}

[data-theme="dark"]{
  --bg:#0d0d0d;
  --fg:#e8e8e8;
  --muted:#8a8a8a;
  --accent:#e8e8e8;
  --card:#181818;
  --border:#2a2a2a;
  --nav-bg:#111111;
  --hover-bg:#222222;
  --shadow-light:rgba(0,0,0,.2);
  --shadow-heavy:rgba(0,0,0,.5);
  --error-bg:#2a1515;
  --error-border:#4a2525;
  --error-text:#ff8888;
}

/* Dark mode toggle */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  color: var(--fg);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--hover-bg);
  transform: translateY(-1px);
}

.theme-icon {
  font-size: 16px;
}

/* Smooth transitions */
html {
  transition: background-color 0.3s ease, color 0.3s ease;
}

body, .nav, .feed .letter, input, textarea, button, .errors {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Dark mode specific enhancements */
[data-theme="dark"] .markdown-content pre {
  background: #1a1a1a;
  border-color: var(--border);
}

[data-theme="dark"] .markdown-content code {
  background: #1a1a1a;
  color: #e8e8e8;
}

[data-theme="dark"] .markdown-content blockquote {
  border-left-color: var(--accent);
  background: rgba(255,255,255,0.02);
}

[data-theme="dark"] .resonate-btn.active {
  background: var(--fg);
  color: var(--bg);
}

[data-theme="dark"] .tagline {
  opacity: 0.9;
}

/* Dark mode enhancements */
[data-theme="dark"] .feed .letter {
  box-shadow: 0 1px 3px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.2);
}

[data-theme="dark"] .feed .letter:hover {
  box-shadow: 0 2px 4px rgba(0,0,0,0.4), 0 12px 28px rgba(0,0,0,0.3);
  transform: translateY(-2px);
  transition: all 0.3s ease;
}

[data-theme="dark"] button:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

[data-theme="dark"] input:focus,
[data-theme="dark"] textarea:focus {
  border-color: var(--fg);
  outline: none;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .nav {
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

[data-theme="dark"] .btn-primary {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--fg);
}

[data-theme="dark"] .btn-primary:hover {
  background: var(--hover-bg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:'Courier New',Courier,'Lucida Console',Monaco,monospace;line-height:1.6;min-height:100vh}
body{display:flex;flex-direction:column}
.container{max-width:760px;margin:0 auto;padding:16px}
.main-content{flex:1}
@media (min-width:640px){.container{padding:24px}}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;opacity:0.8}
.nav{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--nav-bg);position:sticky;top:0;z-index:10;flex-wrap:wrap;gap:8px}
.nav-left{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.nav-left .member-count{font-size:11px;color:var(--muted);opacity:0.8;display:none}
.nav-right{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.nav a{margin-left:8px}
.nav .admin-link{color:#d9534f;font-weight:600;border:1px solid #d9534f;padding:2px 8px;border-radius:4px}
.nav .admin-link:hover{background:#d9534f;color:white;text-decoration:none}
.nav .handle{margin-left:4px;color:var(--muted);font-size:14px}
.nav button{font-size:14px;padding:6px 10px}
@media (min-width:640px){
  .nav{padding:12px 24px;flex-wrap:nowrap}
  .nav-left{gap:16px}
  .nav-left .member-count{display:inline;font-size:12px}
  .nav a{margin-left:12px}
  .nav .handle{margin-left:8px;font-size:inherit}
  .nav button{font-size:inherit;padding:10px 14px}
}
h1,h2{line-height:1.2}
form{display:flex;flex-direction:column;gap:12px}
input,textarea,button{font:inherit}
input,textarea{padding:10px;border:1px solid var(--border);border-radius:8px;background:var(--card);color:var(--fg)}
button{padding:10px 14px;border:1px solid var(--border);border-radius:8px;background:var(--card);cursor:pointer;color:var(--fg)}
button:hover{background:var(--hover-bg)}
input:focus, textarea:focus, button:focus {
  outline: none;
  border-color: var(--fg);
  box-shadow: 0 0 0 2px rgba(0,0,0,0.04);
}
.errors{background:var(--error-bg);border:1px solid var(--error-border);color:var(--error-text);padding:8px 12px;border-radius:8px}
.empty{color:var(--muted)}
.feed .letter{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px;margin:14px 0;box-shadow:0 1px 2px var(--shadow-light),0 6px 18px var(--shadow-heavy)}
.feed .letter h2{font-size:18px}
.feed .letter .meta{color:var(--muted);font-size:12px;margin-bottom:8px}
.feed .letter .actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.feed .letter .actions form{margin:0}

/* Feed Author Section */
.feed-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* Author glow effect - minimalist, avatar only */
.author-avatar {
  position: relative;
  box-shadow: 
    0 0 15px rgba(255, 215, 0, 0.3),
    0 0 30px rgba(255, 215, 0, 0.15);
  border: 1px solid rgba(255, 215, 0, 0.3);
}

[data-theme="dark"] .author-avatar {
  box-shadow: 
    0 0 20px rgba(255, 215, 0, 0.4),
    0 0 40px rgba(255, 215, 0, 0.2);
  border: 1px solid rgba(255, 215, 0, 0.4);
}

.author-badge {
  margin-left: 4px;
  font-size: 14px;
  vertical-align: middle;
  opacity: 0.8;
  filter: drop-shadow(0 0 3px rgba(255, 215, 0, 0.5));
}

/* Auto-linked URLs in feed */
.auto-link {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--muted);
  text-underline-offset: 2px;
  transition: all 0.2s ease;
}

.auto-link:hover {
  color: var(--fg);
  text-decoration-color: var(--fg);
  opacity: 0.8;
}

[data-theme="dark"] .auto-link {
  text-decoration-color: #666;
}

[data-theme="dark"] .auto-link:hover {
  text-decoration-color: #999;
}

/* Format badges */
.format-badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 12px;
  background: var(--hover-bg);
  color: var(--muted);
  border: 1px solid var(--border);
  vertical-align: middle;
}

.format-badge.format-haiku,
.format-badge.format-sixword,
.format-badge.format-flash,
.format-badge.format-question {
  background: var(--hover-bg);
  color: var(--muted);
  border-color: var(--border);
}

[data-theme="dark"] .format-badge {
  background: var(--hover-bg);
  opacity: 0.9;
}

.feed-author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--hover-bg);
  border: 1px solid var(--border);
  overflow: hidden;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feed-author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feed-author-info {
  flex: 1;
  min-width: 0;
}

.feed-author-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--fg);
}

.feed-author-bio {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (min-width:640px){
  .feed .letter{border-radius:14px;padding:18px;margin:18px 0}
  .feed .letter h2{font-size:24px}
  .feed .letter .meta{font-size:14px}
  .feed-author-avatar {
    width: 40px;
    height: 40px;
  }
  .feed-author-name {
    font-size: 14px;
  }
  .feed-author-bio {
    font-size: 13px;
  }
}
.pagination{display:flex;gap:12px;justify-content:center;margin:24px 0}
.letter-detail .meta{color:var(--muted)}
pre{white-space:pre-wrap;margin:0}
.comments ul{list-style:none;padding:0}
.comments li{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px;margin:12px 0}
.hint{color:var(--muted);font-size:14px}

.tagline{color:var(--muted);font-style:italic;font-size:12px;padding-top:8px;line-height:1.4}
.tagline q{quotes:""" """ "'" "'"}
.tagline q:before{content:open-quote}
.tagline q:after{content:close-quote}
.tagline .author{margin-left:6px;display:inline-block}
@media (min-width:640px){
  .tagline{font-size:14px}
}

/* Hero */
.hero{padding:24px 16px 12px;margin:0 auto;max-width:760px}
.hero h1{margin:0 0 8px 0;font-weight:600;letter-spacing:.1px;font-size:24px}
.hero p{margin:0 0 16px 0;color:var(--muted);font-size:14px}
.hero-ctas{display:flex;gap:12px;flex-wrap:wrap}
@media (min-width:640px){
  .hero{padding:40px 24px 12px}
  .hero h1{font-size:32px}
  .hero p{font-size:16px}
}

/* Buttons */
.btn{display:inline-block;padding:10px 14px;border:1px solid var(--border);border-radius:999px;background:var(--card);color:var(--fg);text-decoration:none}
.btn:hover{background:var(--hover-bg);text-decoration:none}
.btn-primary{border-color:transparent;background:var(--fg);color:var(--bg)}
.btn-primary:hover{filter:brightness(1.05)}
.btn-ghost{background:transparent;color:var(--fg)}
.btn-danger{border-color:#dc3545;background:#dc3545;color:white}
.btn-danger:hover{background:#c82333;border-color:#bd2130}

.section-title{font-size:18px;color:var(--muted);margin:8px 0 6px 0}

/* Features grid */
.features{display:grid;grid-template-columns:1fr;gap:12px;margin:12px auto 8px;max-width:760px}
.features .feature{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px}
.features .feature h3{margin:0 0 6px 0;font-size:15px}
.features .feature p{margin:0;color:var(--muted);font-size:13px}
@media (min-width:640px){
  .features{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
  .features .feature{padding:14px}
  .features .feature h3{font-size:16px}
  .features .feature p{font-size:14px}
}

/* Footer */
.footer{margin-top:auto;border-top:1px solid var(--border);background:var(--card)}
.footer-inner{display:flex;flex-direction:column;gap:10px;align-items:center;padding:18px;text-align:center;font-size:13px}
.footer-nav a{margin:0 6px}
@media (min-width:640px){
  .footer-inner{flex-direction:row;justify-content:space-between;padding:18px 24px;text-align:left;font-size:14px}
  .footer-nav a{margin-left:12px}
}

/* Markdown content styles */
.markdown-content{font-family:system-ui,-apple-system,sans-serif;line-height:1.6}
.markdown-content h1{font-size:28px;margin:20px 0 16px 0;font-weight:600}
.markdown-content h2{font-size:24px;margin:18px 0 14px 0;font-weight:600}
.markdown-content h3{font-size:20px;margin:16px 0 12px 0;font-weight:600}
.markdown-content p{margin:12px 0}
.markdown-content ul,.markdown-content ol{margin:12px 0;padding-left:24px}
.markdown-content li{margin:6px 0}
.markdown-content blockquote{border-left:4px solid var(--border);padding-left:16px;margin:16px 0;color:var(--muted);font-style:italic}
.markdown-content code{background:var(--hover-bg);padding:2px 6px;border-radius:4px;font-family:'Courier New',monospace;font-size:14px}
.markdown-content pre{background:var(--hover-bg);padding:12px;border-radius:8px;overflow-x:auto;margin:16px 0}
.markdown-content pre code{background:none;padding:0}
.markdown-content a{color:var(--accent);text-decoration:underline}
.markdown-content hr{border:none;border-top:1px solid var(--border);margin:24px 0}
.markdown-content img{max-width:100%;height:auto;border-radius:8px;margin:12px 0}
.markdown-content table{border-collapse:collapse;width:100%;margin:16px 0}
.markdown-content th,.markdown-content td{border:1px solid var(--border);padding:8px 12px;text-align:left}
.markdown-content th{background:var(--hover-bg);font-weight:600}
.markdown-content strong{font-weight:600}
.markdown-content em{font-style:italic}

/* Reading Status Actions */
.actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

/* Collapsed/Saved Letter Styles */
.letter-collapsed {
  padding: 16px !important;
  background: linear-gradient(135deg, var(--card), var(--hover-bg));
  border-left: 3px solid #f59e0b;
}

.letter-saved-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.saved-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #f59e0b;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hourglass-icon {
  font-size: 16px;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.saved-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.saved-title a {
  color: var(--fg);
  text-decoration: none;
}

.saved-title a:hover {
  text-decoration: underline;
}

.saved-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  flex-wrap: wrap;
}

.saved-meta .separator {
  opacity: 0.5;
}

.expand-btn {
  margin-left: auto;
  padding: 4px 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--fg);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 4px;
}

.expand-btn:hover {
  background: var(--hover-bg);
  transform: translateY(-1px);
}

.expand-icon {
  font-size: 10px;
  transition: transform 0.2s ease;
}

.letter-full-content {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.saved-actions {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* Dark mode adjustments for saved letters */
[data-theme="dark"] .letter-collapsed {
  background: linear-gradient(135deg, var(--card), rgba(245, 158, 11, 0.05));
  border-left-color: #f59e0b;
}

[data-theme="dark"] .saved-indicator {
  color: #fbbf24;
}

[data-theme="dark"] .expand-btn {
  background: var(--hover-bg);
  border-color: rgba(245, 158, 11, 0.2);
}

[data-theme="dark"] .expand-btn:hover {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
}

.reading-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.reading-btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-serif);
}

.reading-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.reading-btn .icon {
  font-size: 14px;
}

.reading-btn.read {
  border-color: #22c55e;
  color: #22c55e;
}

.reading-btn.read:hover:not(:disabled) {
  background: #22c55e;
  color: var(--bg);
}

.reading-btn.skip {
  border-color: #64748b;
  color: #64748b;
}

.reading-btn.skip:hover:not(:disabled) {
  background: #64748b;
  color: var(--bg);
}

.reading-btn.later {
  border-color: #f59e0b;
  color: #f59e0b;
}

.reading-btn.later:hover:not(:disabled) {
  background: #f59e0b;
  color: var(--bg);
}

.reading-btn.completed {
  opacity: 0.6;
  cursor: default;
  background: var(--hover-bg);
}

.reading-btn.active {
  background: var(--hover-bg);
  border-color: #f59e0b;
}

.resonate-action {
  display: inline-block;
}

.resonate-btn {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: 16px;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s ease;
}

.resonate-btn:hover {
  background: var(--fg);
  color: var(--bg);
}

.resonate-btn.active {
  background: var(--fg);
  color: var(--bg);
}