:root {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
  }
}

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

body {
  font-family: var(--font);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  padding: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
  flex: 1;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--card-border);
}

header h1 {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

header nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 12px;
}

header nav a.active {
  color: var(--primary);
  font-weight: 600;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.card-interactive {
  transition: transform 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
  text-decoration: none;
  display: block;
  color: inherit;
}

.card-interactive:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

/* Tabs */
.tab-bar {
  display: flex;
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 16px;
  gap: 4px;
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
  text-align: center;
}

.tab-btn.active {
  background-color: var(--primary);
  color: #ffffff;
}

/* Search Bar */
.search-box {
  margin-bottom: 16px;
}

.search-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background-color: var(--card-bg);
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
}

/* Forms & Buttons */
.form-group {
  margin-bottom: 16px;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input[type="text"],
input[type="url"],
select,
textarea {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  background-color: var(--bg-color);
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  background-color: var(--primary);
  color: #ffffff;
  transition: background-color 0.2s, opacity 0.2s;
  text-decoration: none;
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

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

.btn-danger:hover {
  background-color: var(--danger-hover);
}

.btn-small {
  width: auto;
  padding: 6px 12px;
  font-size: 0.85rem;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--card-border);
  color: var(--text-muted);
  text-transform: uppercase;
}

.badge-article { background-color: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.badge-paper { background-color: rgba(168, 85, 247, 0.2); color: #c084fc; }
.badge-tweet { background-color: rgba(14, 165, 233, 0.2); color: #38bdf8; }
.badge-book { background-color: rgba(234, 179, 8, 0.2); color: #facc15; }
.badge-thought { background-color: rgba(16, 185, 129, 0.2); color: #34d399; }

.digest-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-bottom: 1px solid var(--card-border);
  padding: 16px 0;
}

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

.digest-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.digest-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
}

.digest-note {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
  background-color: rgba(0, 0, 0, 0.15);
  padding: 8px 12px;
  border-radius: 6px;
  border-left: 3px solid var(--primary);
}

/* Markdown Reader Styles */
.markdown-body {
  font-size: 1.02rem;
  color: var(--text-main);
  line-height: 1.7;
}

.md-h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 24px 0 12px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--card-border);
}

.md-h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 20px 0 10px 0;
  color: var(--primary);
}

.md-h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 16px 0 8px 0;
}

.md-p {
  margin-bottom: 14px;
}

.md-ul {
  margin-bottom: 14px;
  padding-left: 20px;
}

.md-li {
  margin-bottom: 6px;
}

.md-quote {
  border-left: 4px solid var(--primary);
  padding: 10px 16px;
  margin: 16px 0;
  background-color: rgba(0, 0, 0, 0.15);
  color: var(--text-muted);
  font-style: italic;
  border-radius: 0 8px 8px 0;
}

.code-block {
  background-color: #020617;
  border: 1px solid var(--card-border);
  padding: 14px;
  border-radius: 8px;
  overflow-x: auto;
  font-family: monospace;
  font-size: 0.9rem;
  margin: 16px 0;
}

.inline-code {
  background-color: rgba(0, 0, 0, 0.2);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9em;
  color: #f43f5e;
}

.wikilink-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background-color: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #60a5fa;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  margin: 2px 4px 2px 0;
  transition: background-color 0.2s, border-color 0.2s;
}

.wikilink-badge:hover {
  background-color: rgba(59, 130, 246, 0.3);
  border-color: #60a5fa;
}

.external-link {
  color: var(--primary);
  text-decoration: underline;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  font-size: 0.9rem;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}

.toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(-10px);
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }