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

:root {
  --bg: #1a1a2e;
  --bg-surface: #16213e;
  --bg-input: #0f3460;
  --text: #e0e0e0;
  --text-dim: #8892a4;
  --accent: #e94560;
  --accent-soft: #533483;
  --border: #2a2a4a;
  --msg-user-bg: #0f3460;
  --msg-assistant-bg: #1a1a3e;
  --radius: 8px;
  --sidebar-w: 260px;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}

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

/* ===== Top nav ===== */
.topnav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.5rem 1.5rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  height: 48px;
}
.nav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }
.nav-links { display: flex; gap: 1rem; }
.nav-links a {
  color: var(--text-dim);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius);
  transition: background 0.15s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: var(--bg-input);
  text-decoration: none;
}

/* ===== Home page ===== */
.home-page {
  text-align: center;
  padding: 4rem 1rem;
}
.home-page h1 {
  font-size: 2.5rem;
  margin-bottom: 0.25rem;
}
.subtitle {
  color: var(--text-dim);
  margin-bottom: 3rem;
}
.home-cards {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}
.home-card {
  display: block;
  width: 280px;
  padding: 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s;
  color: var(--text);
}
.home-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}
.card-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.home-card h2 { margin-bottom: 0.5rem; }
.home-card p { color: var(--text-dim); font-size: 0.9rem; }

/* ===== Chat layout ===== */
.chat-layout {
  display: flex;
  height: calc(100vh - 48px);
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-header h3 { font-size: 0.9rem; font-weight: 600; }
.session-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
}
.session-item a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.session-item a:hover { background: var(--bg-input); text-decoration: none; }
.session-item.active a { background: var(--bg-input); border-left: 3px solid var(--accent); }
.session-name { display: block; font-size: 0.9rem; }
.session-meta { font-size: 0.75rem; color: var(--text-dim); }

/* Stats sidebar (photos) */
.stats-panel {
  padding: 1rem;
  overflow-y: auto;
  flex: 1;
}
.stat-item { margin-bottom: 0.75rem; }
.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--accent); }
.stat-label { display: block; font-size: 0.8rem; color: var(--text-dim); }
.stats-panel h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 1rem 0 0.5rem;
}
.stat-list { list-style: none; }
.stat-list li {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  padding: 0.2rem 0;
}
.stat-list .count { color: var(--text-dim); }

/* Chat container */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.5rem;
}

/* Messages */
.message {
  margin-bottom: 1rem;
  max-width: 80%;
}
.message.user {
  margin-left: auto;
}
.message.assistant {
  margin-right: auto;
}
.message-role {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.2rem;
}
.message.user .message-role { text-align: right; }
.message-content {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  overflow-wrap: break-word;
}
.message.user .message-content {
  background: var(--msg-user-bg);
  border-bottom-right-radius: 2px;
}
.message.assistant .message-content {
  background: var(--msg-assistant-bg);
  border: 1px solid var(--border);
  border-bottom-left-radius: 2px;
}

/* Markdown inside messages */
.message-content h1, .message-content h2, .message-content h3 {
  margin: 0.5em 0 0.3em;
  font-size: 1em;
  font-weight: 700;
}
.message-content p { margin: 0.3em 0; }
.message-content ul, .message-content ol { margin: 0.3em 0; padding-left: 1.5em; }
.message-content code {
  background: rgba(255,255,255,0.08);
  padding: 0.15em 0.3em;
  border-radius: 3px;
  font-size: 0.9em;
}
.message-content pre {
  background: rgba(0,0,0,0.3);
  padding: 0.75em;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 0.5em 0;
}
.message-content pre code { background: none; padding: 0; }
.message-content table {
  border-collapse: collapse;
  margin: 0.5em 0;
  width: 100%;
}
.message-content th, .message-content td {
  border: 1px solid var(--border);
  padding: 0.3em 0.6em;
  text-align: left;
  font-size: 0.9em;
}
.message-content th { background: rgba(255,255,255,0.05); }
.message-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 0.75em;
  color: var(--text-dim);
  margin: 0.5em 0;
}

/* Command bar */
.command-bar {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem 1.5rem;
  border-top: 1px solid var(--border);
}
.cmd-btn {
  background: var(--bg-surface);
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.cmd-btn:hover { background: var(--bg-input); color: var(--text); }

/* Input bar */
.chat-input {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}
.chat-input input {
  flex: 1;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  font-size: 0.95rem;
  outline: none;
}
.chat-input input:focus { border-color: var(--accent); }
.chat-input input::placeholder { color: var(--text-dim); }
.chat-input button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: opacity 0.15s;
}
.chat-input button:hover { opacity: 0.9; }
.chat-input button:disabled { opacity: 0.5; cursor: not-allowed; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-dim);
}
.empty-state p { margin: 0.5rem 0; }
.hint { font-size: 0.85rem; }

/* Thinking spinner */
.thinking-indicator {
  color: var(--text-dim);
  font-style: italic;
  padding: 0.5rem 1rem;
}
.thinking-indicator::after {
  content: '';
  animation: dots 1.5s infinite;
}
@keyframes dots {
  0%, 20% { content: '.'; }
  40% { content: '..'; }
  60%, 100% { content: '...'; }
}

/* Buttons */
.btn {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
}
.btn:hover { background: var(--accent-soft); }
.btn-sm { font-size: 0.8rem; padding: 0.2rem 0.6rem; }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .chat-layout { display: block; }
  .message { max-width: 95%; }
}