/* app.css — ZerozeroOS Chat UI */

#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── Sidebar ─────────────────────────────────── */
.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  transition: width 0.2s, min-width 0.2s;
}
.sidebar.collapsed {
  width: 0;
  min-width: 0;
  overflow: hidden;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}
.btn-new-chat {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-new-chat:hover { opacity: 0.85; }

.sidebar-search { padding: 12px 16px; }
.search-input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
}
.search-input:focus { border-color: var(--accent); }

.conversation-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.conversation-list::-webkit-scrollbar { width: 4px; }
.conversation-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.conv-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-dim);
  font-size: 13px;
  font-family: var(--font-mono);
  transition: background 0.15s, color 0.15s;
  margin-bottom: 2px;
  position: relative;
}
.conv-item:hover { background: var(--bg-card-hover); color: var(--text); }
.conv-item.active { background: var(--bg-card-hover); color: var(--accent); }
.conv-item-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv-item-delete {
  opacity: 0;
  width: 20px;
  height: 20px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.conv-item:hover .conv-item-delete { opacity: 1; }
.conv-item-delete:hover { color: #ff4d6d; }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
}
.usage-summary {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
}
.usage-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
}
.usage-value { font-family: var(--font-mono); color: var(--text); }
.sidebar-actions { display: flex; flex-direction: column; gap: 8px; }
.btn-premium {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px;
  background: linear-gradient(135deg, #ffb700, #ff6b35);
  color: white;
  border: none;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-premium:hover { opacity: 0.9; }

/* ── Chat Main ────────────────────────────────── */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 8, 16, 0.8);
  backdrop-filter: blur(12px);
  flex-shrink: 0;
}
.btn-toggle-sidebar {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
}
.btn-toggle-sidebar:hover { color: var(--text); }

.chat-title {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.btn-model {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-model:hover { border-color: var(--accent); color: var(--text); }

/* Toggle switch */
.toggle-no-history {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}
.toggle-label { font-size: 12px; color: var(--text-dim); font-family: var(--font-mono); }
.toggle-no-history input { display: none; }
.toggle-track {
  width: 32px;
  height: 18px;
  background: var(--text-muted);
  border-radius: 9px;
  position: relative;
  transition: background 0.2s;
}
.toggle-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 12px;
  height: 12px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
}
.toggle-no-history input:checked + .toggle-track {
  background: var(--accent);
}
.toggle-no-history input:checked + .toggle-track::after {
  transform: translateX(14px);
}
.toggle-no-history input:disabled + .toggle-track {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Messages ─────────────────────────────────── */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  scroll-behavior: smooth;
}
.messages-container::-webkit-scrollbar { width: 6px; }
.messages-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.welcome-state {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  position: relative;
}
.welcome-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.3;
  pointer-events: none;
}
.welcome-content { position: relative; z-index: 1; }
.welcome-icon {
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  justify-content: center;
}
.welcome-content h1 {
  font-size: 28px;
  color: var(--text);
  margin-bottom: 8px;
}
.welcome-content p {
  color: var(--text-dim);
  font-size: 15px;
  margin-bottom: 28px;
}
.model-select-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.model-chip {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.model-chip:hover { border-color: var(--accent); color: var(--text); }
.model-chip.active { border-color: var(--accent); color: var(--accent); background: rgba(0, 229, 255, 0.05); }
.premium-tag {
  font-size: 10px;
  background: var(--amber);
  color: var(--bg);
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: 4px;
  font-weight: 700;
}

/* Sample prompts */
.sample-prompts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  max-width: 560px;
  margin: 0 auto;
}
.sample-prompt {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  line-height: 1.4;
}
.sample-prompt:hover {
  border-color: var(--accent);
  color: var(--text);
  background: var(--bg-card-hover);
}

/* Messages */
.messages-list { display: flex; flex-direction: column; gap: 24px; }
.message { display: flex; gap: 14px; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.message.user { flex-direction: row-reverse; }
.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
  font-family: var(--font-mono);
}
.message.user .message-avatar { background: var(--accent); color: var(--bg); }
.message.assistant .message-avatar { background: var(--bg-card); border: 1px solid var(--border); color: var(--amber); }
.message-content {
  max-width: 700px;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}
.message.user .message-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom-right-radius: 4px;
}
.message.assistant .message-content {
  background: rgba(0, 229, 255, 0.04);
  border: 1px solid rgba(0, 229, 255, 0.15);
  border-bottom-left-radius: 4px;
}
.message-meta {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  color: var(--text-dim);
  font-size: 13px;
  font-family: var(--font-mono);
}
.typing-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: bounce 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* ── Input Area ──────────────────────────────── */
.input-area {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
}
.input-wrapper {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
  transition: border-color 0.2s;
}
.input-wrapper:focus-within { border-color: var(--accent); }
.input-wrapper textarea {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  resize: none;
  max-height: 200px;
  overflow-y: auto;
}
.input-wrapper textarea::placeholder { color: var(--text-dim); }
.btn-send {
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: opacity 0.2s;
}
.btn-send:hover { opacity: 0.8; }
.btn-send:disabled { opacity: 0.3; cursor: not-allowed; }
.input-meta {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* ── Modal ───────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 8, 16, 0.7);
  backdrop-filter: blur(4px);
}
.modal-content {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  max-width: 420px;
  width: 90%;
}
.modal-content h3 {
  font-size: 16px;
  margin-bottom: 16px;
  color: var(--text);
}
.model-options { display: flex; flex-direction: column; gap: 8px; }
.model-option {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  position: relative;
  transition: border-color 0.2s;
}
.model-option:hover { border-color: var(--accent); }
.model-option strong { font-size: 14px; color: var(--text); font-family: var(--font-mono); }
.model-option span { font-size: 12px; color: var(--text-dim); }
.model-pricing { font-size: 12px; color: var(--accent); font-family: var(--font-mono); }
.premium-badge {
  position: absolute;
  top: 10px;
  right: 12px;
  background: var(--amber);
  color: var(--bg);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
}

/* ── Mobile Responsive ────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 150;
    transform: translateX(-100%);
    transition: transform 0.2s;
  }
  .sidebar.open {
    transform: translateX(0);
    width: 280px;
    min-width: 280px;
  }
  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(8,8,16,0.5);
    z-index: 140;
    display: none;
  }
  .sidebar-overlay.visible { display: block; }
  .chat-main { width: 100%; }
  .messages-container { padding: 16px; }
  .chat-header { padding: 12px 16px; }
  .input-area { padding: 12px 16px; }
}