/* ============================================================
   css/style.css — Основні стилі AI Hub
   ============================================================ */

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

:root {
  --bg: #0a0a0f;
  --surface: #111118;
  --surface2: #1a1a24;
  --border: #2a2a3a;
  --text: #e8e8f0;
  --muted: #6b6b85;
  --accent-eat: #39ff8a;
  --accent-news: #ff6b35;
  --accent-code: #5b8fff;
  --accent-chat: #c77dff;
  --accent-law: #f4c542;
  --accent-culture: #ff4d8d;
  --mono: 'Space Mono', monospace;
  --display: 'Syne', sans-serif;
  --header-bg: rgba(10,10,15,0.8);
  --code-bg: #0d0d1a;
  --code-inline-bg: #1a1a2e;
  --mobile-nav-bg: rgba(10,10,15,0.97);
}

/* ====== Світла тема ====== */
:root[data-theme="light"] {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --surface2: #e8eaf0;
  --border: #c8cad8;
  --text: #0f1117;
  --muted: #5a5c72;
  /* Акценти насичені і контрастні на світлому фоні */
  --accent-eat: #0a9e4a;
  --accent-news: #c43a10;
  --accent-code: #1a5fe8;
  --accent-chat: #6b21c8;
  --accent-law: #8a6200;
  --accent-culture: #b80048;
  --header-bg: rgba(240,242,245,0.92);
  --code-bg: #1e1e2e;
  --code-inline-bg: #dde0ec;
  --mobile-nav-bg: rgba(255,255,255,0.98);
}

/* Плавне переключення теми — тільки на конкретні властивості, НЕ all
   (transition:all ламає drag-and-drop в Chrome/Safari) */
body, .sidebar, .header, .modal, .sessions-panel, .auth-card,
.agent-btn, .msg-content, .input-wrap, .user-dropdown,
.modal-overlay, .auth-screen, .example-prompt, .session-item {
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ====== Header ====== */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  background: var(--header-bg);
}

.logo {
  font-family: var(--display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.5px;
}

.logo span {
  background: linear-gradient(135deg, var(--accent-eat), var(--accent-code));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.api-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  color: var(--muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-eat);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* ====== Layout ====== */
.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - 65px);
  position: relative;
  z-index: 1;
}

/* ====== Sidebar ====== */
.sidebar {
  border-right: 1px solid var(--border);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(17,17,24,0.5);
}

.sidebar-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--muted);
  text-transform: uppercase;
  padding: 0 12px;
  margin-bottom: 4px;
  margin-top: 8px;
}

.agent-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
  cursor: pointer;
  /* FIX: transition:all ламає drag-and-drop в Chrome/Safari — використовуємо конкретні властивості */
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, opacity 0.2s ease;
  text-align: left;
  position: relative;
  overflow: hidden;
}

.agent-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 3px;
  opacity: 0;
  transition: opacity 0.2s;
}

.agent-btn:hover { background: var(--surface2); color: var(--text); }
.agent-btn.active { background: var(--surface2); border-color: var(--border); color: var(--text); }
.agent-btn.active::before { opacity: 1; }

.agent-btn[data-agent="eat"]     { --agent-color: var(--accent-eat); }
.agent-btn[data-agent="news"]    { --agent-color: var(--accent-news); }
.agent-btn[data-agent="code"]    { --agent-color: var(--accent-code); }
.agent-btn[data-agent="chat"]    { --agent-color: var(--accent-chat); }
.agent-btn[data-agent="law"]     { --agent-color: var(--accent-law); }
.agent-btn[data-agent="culture"] { --agent-color: var(--accent-culture); }

.agent-btn::before { background: var(--agent-color); }
.agent-btn.active .agent-icon { color: var(--agent-color); }

.agent-icon { font-size: 20px; width: 24px; text-align: center; transition: color 0.2s; }
.agent-info { flex: 1; }
.agent-name { font-size: 13px; font-weight: 700; font-family: var(--display); }
.agent-desc { font-size: 10px; color: var(--muted); margin-top: 1px; }

.agent-delete-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  padding: 3px 5px;
  border-radius: 5px;
  opacity: 0;
  transition: all 0.15s;
  line-height: 1;
  flex-shrink: 0;
}
.agent-btn:hover .agent-delete-btn { opacity: 1; }
.agent-delete-btn:hover { background: rgba(255,80,80,0.15); color: #ff6b6b; }

.add-agent-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
  margin-top: 4px;
}
.add-agent-btn:hover { border-color: var(--accent-code); color: var(--text); }

.api-key-section {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.api-key-input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 11px;
  outline: none;
  transition: border-color 0.2s;
}
.api-key-input:focus { border-color: var(--accent-code); }

.api-key-label {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 6px;
  display: block;
}

/* ====== Export/Import ====== */
.sidebar-io {
  display: flex;
  gap: 6px;
  padding: 0 0 12px;
}
.io-btn {
  flex: 1;
  padding: 7px 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.5px;
}
.io-btn:hover { border-color: var(--accent-code); color: var(--text); }

/* ====== Chat area ====== */
.chat-area {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 65px);
}

.agent-header {
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
}

.agent-avatar {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  border: 1px solid var(--border);
}

.agent-header-info h2 {
  font-family: var(--display);
  font-weight: 800;
  font-size: 18px;
}

.agent-header-info p {
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}

.model-badge {
  margin-left: auto;
  font-size: 10px;
  color: var(--muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 20px;
  letter-spacing: 1px;
}

/* ====== Messages ====== */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.welcome-msg {
  text-align: center;
  padding: 40px 20px;
  animation: fadeIn 0.5s ease;
}

.welcome-icon {
  font-size: 52px;
  display: block;
  margin-bottom: 16px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.welcome-msg h3 { font-family: var(--display); font-size: 22px; margin-bottom: 8px; }
.welcome-msg p { font-size: 13px; color: var(--muted); max-width: 400px; margin: 0 auto; line-height: 1.6; }

.example-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 20px;
}

.example-prompt {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--mono);
}
.example-prompt:hover { border-color: var(--agent-accent); color: var(--text); transform: translateY(-1px); }

.msg {
  display: flex;
  gap: 12px;
  animation: slideIn 0.3s ease;
  position: relative;
}

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

.msg.user { flex-direction: row-reverse; }

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: var(--surface2);
}

.msg-content {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.65;
  border: 1px solid var(--border);
}

.msg.user .msg-content { background: var(--surface2); border-radius: 12px 4px 12px 12px; color: var(--text); }
.msg.assistant .msg-content { background: var(--surface); border-radius: 4px 12px 12px 12px; color: var(--text); border-left: 2px solid var(--agent-accent, var(--accent-eat)); }

.typing {
  display: flex;
  gap: 4px;
  align-items: center;
  padding: 14px 16px;
}
.typing span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--muted);
  animation: bounce 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: 0.15s; }
.typing span:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* Copy button */
.msg-actions {
  position: absolute;
  top: 4px;
  opacity: 0;
  transition: opacity 0.15s;
  display: flex;
  gap: 4px;
}
.msg.user .msg-actions { left: 4px; }
.msg.assistant .msg-actions { right: 4px; }
.msg:hover .msg-actions { opacity: 1; }

.msg-action-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-size: 11px;
  padding: 3px 7px;
  cursor: pointer;
  font-family: var(--mono);
  transition: all 0.15s;
  line-height: 1.4;
}
.msg-action-btn:hover { color: var(--text); border-color: var(--muted); }
.msg-action-btn.copied { color: var(--accent-eat); border-color: var(--accent-eat); }

/* ====== Code blocks ====== */
.msg-content pre {
  padding: 0 !important;
  background: transparent !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  overflow: hidden !important;
  margin: 8px 0 !important;
}
.msg-content pre code.hljs {
  padding: 14px 16px !important;
  font-size: 12px !important;
  line-height: 1.6 !important;
  border-radius: 8px !important;
  background: var(--code-bg) !important;
  display: block;
}
.msg-content :not(pre) > code {
  background: var(--code-inline-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 12px;
  font-family: var(--mono);
}
.msg-content p { margin-bottom: 6px; }
.msg-content p:last-child { margin-bottom: 0; }
.msg-content ul, .msg-content ol { padding-left: 18px; margin-bottom: 6px; }
.msg-content li { margin-bottom: 3px; }

/* ====== Input area ====== */
.input-area { padding: 16px 28px 24px; border-top: 1px solid var(--border); }

.input-wrap {
  display: flex;
  gap: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 4px 4px 4px 16px;
  transition: border-color 0.2s;
}
.input-wrap:focus-within { border-color: var(--agent-accent, var(--accent-eat)); }

.msg-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  resize: none;
  min-height: 44px;
  max-height: 160px;
  padding: 12px 0;
  line-height: 1.5;
}
.msg-input::placeholder { color: var(--muted); }

.send-btn {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  border: none;
  background: var(--agent-accent, var(--accent-eat));
  color: #000;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
  align-self: flex-end;
}
.send-btn:hover { transform: scale(1.05); filter: brightness(1.1); }
.send-btn:active { transform: scale(0.97); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.input-hint { font-size: 10px; color: var(--muted); margin-top: 8px; padding: 0 4px; }

.error-banner {
  background: rgba(255,50,50,0.1);
  border: 1px solid rgba(255,50,50,0.3);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 12px;
  color: #ff6b6b;
  margin-top: 8px;
  display: none;
}

/* ====== Header buttons ====== */
.header-icon-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 15px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}
.header-icon-btn:hover { border-color: var(--muted); color: var(--text); }
.header-icon-btn.search-on {
  border-color: var(--accent-code);
  color: var(--accent-code);
  background: rgba(91,143,255,0.12);
}

.clear-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.15s;
  margin-left: 8px;
}
.clear-btn:hover { border-color: var(--border); color: var(--text); }

.history-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 10px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 5px;
}
.history-btn:hover { border-color: var(--muted); color: var(--text); }

.history-count {
  background: var(--surface2);
  border-radius: 10px;
  padding: 1px 6px;
  font-size: 10px;
  color: var(--accent-code);
}

/* ====== Sessions panel ====== */
.sessions-panel {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: 300px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 200;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.25s cubic-bezier(0.4,0,0.2,1);
}
.sessions-panel.open { transform: translateX(0); }

.sessions-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
}
.sessions-overlay.open { opacity: 1; pointer-events: all; }

.sessions-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.sessions-title { font-family: var(--display); font-weight: 800; font-size: 15px; color: var(--text); }

.sessions-close-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--muted);
  font-size: 18px;
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.15s;
  line-height: 1;
}
.sessions-close-btn:hover { border-color: var(--border); color: var(--text); }

.new-chat-btn {
  margin: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface2);
  border: 1px dashed var(--border);
  border-radius: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}
.new-chat-btn:hover { border-color: var(--accent-code); color: var(--text); }

.sessions-list { flex: 1; overflow-y: auto; padding: 4px 8px 16px; }
.sessions-group-label { font-size: 10px; letter-spacing: 2px; color: var(--muted); text-transform: uppercase; padding: 10px 8px 4px; }

.session-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 9px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}
.session-item:hover { background: var(--surface2); }
.session-item.active { background: var(--surface2); border-color: var(--border); }

.session-agent-icon {
  font-size: 14px;
  width: 28px; height: 28px;
  border-radius: 7px;
  background: var(--bg);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.session-info { flex: 1; min-width: 0; }
.session-name { font-size: 12px; font-family: var(--display); font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-meta { font-size: 10px; color: var(--muted); margin-top: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.session-delete-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  padding: 3px 5px;
  border-radius: 5px;
  opacity: 0;
  transition: all 0.15s;
  flex-shrink: 0;
  line-height: 1;
}
.session-item:hover .session-delete-btn { opacity: 1; }
.session-delete-btn:hover { background: rgba(255,80,80,0.15); color: #ff6b6b; }

/* ====== Modals ====== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: 480px;
  max-width: calc(100vw - 32px);
  max-height: 90vh;
  overflow-y: auto;
  padding: 28px;
  transform: translateY(16px) scale(0.97);
  transition: transform 0.2s;
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }

.modal-title { font-family: var(--display); font-weight: 800; font-size: 18px; margin-bottom: 6px; }
.modal-subtitle { font-size: 12px; color: var(--muted); margin-bottom: 24px; line-height: 1.5; }
.modal-field { margin-bottom: 16px; }
.modal-label { display: block; font-size: 10px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }

.modal-input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
}
.modal-input:focus { border-color: var(--accent-code); }
.modal-textarea { resize: vertical; min-height: 120px; line-height: 1.6; }

.modal-emoji-row { display: flex; flex-wrap: wrap; gap: 6px; }
.emoji-btn {
  width: 36px; height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface2);
  font-size: 18px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
}
.emoji-btn:hover { border-color: var(--accent-code); transform: scale(1.1); }
.emoji-btn.selected { border-color: var(--accent-code); background: rgba(91,143,255,0.15); }

.color-row { display: flex; gap: 8px; flex-wrap: wrap; }
.color-dot {
  width: 28px; height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.15s;
  flex-shrink: 0;
}
.color-dot:hover { transform: scale(1.15); }
.color-dot.selected { border-color: #fff; transform: scale(1.15); }

.generate-btn {
  width: 100%;
  padding: 11px;
  background: var(--surface2);
  border: 1px dashed var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 4px;
}
.generate-btn:hover { border-color: var(--accent-code); color: var(--text); }
.generate-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.modal-actions { display: flex; gap: 10px; margin-top: 24px; }
.modal-btn {
  flex: 1;
  padding: 11px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 700;
}
.modal-btn-cancel { background: transparent; color: var(--muted); }
.modal-btn-cancel:hover { color: var(--text); border-color: var(--muted); }
.modal-btn-save { background: var(--accent-code); color: #000; border-color: var(--accent-code); }
.modal-btn-save:hover { filter: brightness(1.1); }
.modal-btn-save:disabled { opacity: 0.4; cursor: not-allowed; filter: none; }

/* ====== Scrollbar ====== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* ====== Animations ====== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ====== Mobile ====== */
.mobile-nav { display: none; }

@media (max-width: 700px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .header { padding: 12px 16px; }
  .chat-area { height: calc(100vh - 57px - 68px); }
  .messages { padding: 16px; }
  .input-area { padding: 12px 16px 16px; }
  .msg-content { max-width: 88%; }
  .agent-header { padding: 12px 16px; }
  .agent-avatar { width: 36px; height: 36px; font-size: 18px; }
  .agent-header-info h2 { font-size: 15px; }
  .model-badge { display: none; }

  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: 100;
    background: var(--mobile-nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 8px 4px calc(8px + env(safe-area-inset-bottom));
    gap: 2px;
  }

  .mobile-nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: 6px 2px;
    border-radius: 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    transition: background 0.15s ease;
    -webkit-tap-highlight-color: transparent;
    position: relative;
  }
  .mobile-nav-btn:active { background: var(--surface2); }
  .mobile-nav-btn.active { background: var(--surface2); }

  .mobile-nav-icon { font-size: 20px; line-height: 1; }
  .mobile-nav-label { font-family: var(--mono); font-size: 9px; color: var(--muted); transition: color 0.15s; white-space: nowrap; }
  .mobile-nav-btn.active .mobile-nav-label { color: var(--text); }

  .mobile-nav-dot {
    width: 4px; height: 4px;
    border-radius: 50%;
    background: transparent;
    transition: background 0.2s;
    margin-top: 1px;
  }
  .mobile-nav-btn.active .mobile-nav-dot { background: var(--agent-nav-color, var(--accent-eat)); }
}

/* ============================================================
   AUTH STYLES — додати в кінець css/style.css
   ============================================================ */

/* ====== Auth Screen ====== */
.auth-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 1000;
  display: none;          /* hidden by default — shown only if Firebase returns no user */
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.auth-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(91,143,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91,143,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* Glowing orbs */
.auth-screen::before,
.auth-screen::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  opacity: 0.15;
}
.auth-screen::before {
  width: 400px; height: 400px;
  background: var(--accent-code);
  top: -100px; left: -100px;
}
.auth-screen::after {
  width: 300px; height: 300px;
  background: var(--accent-eat);
  bottom: -80px; right: -80px;
}

.auth-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 0;
  animation: authCardIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes authCardIn {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}

.auth-logo {
  font-family: var(--display);
  font-weight: 800;
  font-size: 28px;
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}
.auth-logo span {
  background: linear-gradient(135deg, var(--accent-eat), var(--accent-code));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-tagline {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 24px;
}

.auth-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.auth-tab {
  flex: 1;
  padding: 10px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: -1px;
  letter-spacing: 0.5px;
}
.auth-tab:hover { color: var(--text); }
.auth-tab.active {
  color: var(--text);
  border-bottom-color: var(--accent-code);
}

.auth-input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.auth-input:focus {
  border-color: var(--accent-code);
  box-shadow: 0 0 0 3px rgba(91,143,255,0.12);
}
.auth-input::placeholder { color: var(--muted); }

.auth-api-key-block {
  background: rgba(91,143,255,0.05);
  border: 1px solid rgba(91,143,255,0.2);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.auth-api-key-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.auth-api-link {
  font-size: 10px;
  color: var(--accent-code);
  text-decoration: none;
  transition: opacity 0.2s;
}
.auth-api-link:hover { opacity: 0.7; }

.auth-api-key-block .auth-input {
  background: var(--bg);
  border-color: rgba(91,143,255,0.3);
}

.auth-hint {
  font-size: 10px;
  color: var(--muted);
  line-height: 1.4;
}

.auth-submit-btn {
  width: 100%;
  padding: 13px;
  background: var(--accent-code);
  border: none;
  border-radius: 10px;
  color: #000;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.2s, transform 0.1s;
  letter-spacing: 0.5px;
}
.auth-submit-btn:hover  { filter: brightness(1.1); }
.auth-submit-btn:active { transform: scale(0.99); }
.auth-submit-btn:disabled { opacity: 0.5; cursor: not-allowed; filter: none; }

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 11px;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.google-btn {
  width: 100%;
  padding: 11px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.2s;
}
.google-btn:hover {
  border-color: rgba(91,143,255,0.5);
  background: var(--bg);
}

.auth-error {
  margin-top: 12px;
  font-size: 12px;
  color: #ff6b6b;
  background: rgba(255,107,107,0.08);
  border: 1px solid rgba(255,107,107,0.2);
  border-radius: 8px;
  padding: 10px 12px;
  display: none;
  text-align: center;
}

@keyframes authShake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-4px); }
  75%       { transform: translateX(4px); }
}

/* ====== User Menu in Header ====== */
.user-menu {
  position: relative;
  margin-left: 12px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-code);
  font-weight: 700;
  transition: border-color 0.2s;
  user-select: none;
  text-transform: uppercase;
}
.user-avatar:hover { border-color: var(--accent-code); }

.user-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  min-width: 200px;
  z-index: 500;
  opacity: 0;
  transform: translateY(-4px) scale(0.97);
  pointer-events: none;
  transition: all 0.15s;
}
.user-dropdown.open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

.user-dropdown-email {
  font-size: 11px;
  color: var(--muted);
  padding: 6px 8px;
  word-break: break-all;
}

.user-dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

.user-dropdown-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
}
.user-dropdown-item:hover {
  background: rgba(255,107,107,0.1);
  color: #ff6b6b;
}

/* ====== Mobile auth tweaks ====== */
@media (max-width: 700px) {
  .auth-card { padding: 28px 20px; }
  .user-avatar { width: 28px; height: 28px; font-size: 10px; }
}

/* ====== Theme switcher ====== */
.theme-switcher { display: flex; gap: 8px; }
.theme-btn {
  flex: 1;
  padding: 9px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}
.theme-btn:hover { border-color: var(--muted); color: var(--text); }
.theme-btn.active {
  border-color: var(--accent-code);
  color: var(--text);
  background: rgba(91,143,255,0.12);
}

/* ====== Drag handles ====== */
.drag-handle {
  width: 14px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
  align-items: center;
  justify-content: center;
  /* ВАЖЛИВО: не ставимо transition щоб не ламати dragstart */
  opacity: 0;
  cursor: grab;
  /* FIX: pointer-events явно включені щоб drag працював через handle */
  pointer-events: all;
}
.drag-handle span {
  display: block;
  width: 10px;
  height: 1.5px;
  background: var(--muted);
  border-radius: 2px;
}
.agent-btn:hover .drag-handle { opacity: 1; }
.agent-btn.dragging { opacity: 0.4; }
.agent-btn.drag-over {
  border-color: var(--accent-code);
  background: rgba(91,143,255,0.08);
}

/* ====== Світла тема — додаткові правила ====== */
:root[data-theme="light"] body::before {
  background-image:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
}
:root[data-theme="light"] .auth-bg-grid {
  background-image:
    linear-gradient(rgba(42,111,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,111,255,0.04) 1px, transparent 1px);
}
:root[data-theme="light"] .msg-content pre code.hljs {
  background: #1e1e2e !important;
}
/* Sidebar на світлій темі */
:root[data-theme="light"] .sidebar {
  background: rgba(255,255,255,0.7);
}
/* Agent btn active — чіткіший бордер */
:root[data-theme="light"] .agent-btn.active {
  background: #ffffff;
  border-color: var(--border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
/* Модальний оверлей не такий темний */
:root[data-theme="light"] .modal-overlay {
  background: rgba(0,0,0,0.35);
}
/* Send btn колір тексту — чорний на будь-якому акценті */
:root[data-theme="light"] .send-btn { color: #fff; }
:root[data-theme="light"] .send-btn[style*="background: #0a9e4a"],
:root[data-theme="light"] .send-btn[style*="background: #f4c542"],
:root[data-theme="light"] .send-btn[style*="background: #39ff8a"] { color: #000; }
/* Modal save btn */
:root[data-theme="light"] .modal-btn-save { color: #fff; }
/* Auth submit */
:root[data-theme="light"] .auth-submit-btn { color: #fff; }
/* Scrollbar */
:root[data-theme="light"] ::-webkit-scrollbar-thumb { background: #c0c2d0; }
/* Input wrap focus ring */
:root[data-theme="light"] .input-wrap { background: #ffffff; }
/* Welcome message bg кнопки */
:root[data-theme="light"] .example-prompt {
  background: #ffffff;
  border-color: #c8cad8;
  color: #5a5c72;
}
:root[data-theme="light"] .example-prompt:hover {
  background: var(--surface2);
  color: var(--text);
}
/* Drag-over на світлій темі */
:root[data-theme="light"] .agent-btn.drag-over {
  background: rgba(26,95,232,0.06);
}
/* Тема-switcher активна кнопка */
:root[data-theme="light"] .theme-btn.active {
  background: rgba(26,95,232,0.1);
  border-color: var(--accent-code);
  color: var(--accent-code);
}
/* Lang-switcher */
:root[data-theme="light"] .lang-btn.active {
  background: rgba(26,95,232,0.1);
  border-color: var(--accent-code);
  color: var(--accent-code);
}
/* Header search-on */
:root[data-theme="light"] .header-icon-btn.search-on {
  background: rgba(26,95,232,0.08);
}
/* Sessions overlay */
:root[data-theme="light"] .sessions-overlay {
  background: rgba(0,0,0,0.2);
}
/* Color dot selected border */
:root[data-theme="light"] .color-dot.selected { border-color: #333; }

/* ====== Loading Splash ====== */
.loading-splash {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.4s ease;
}
.loading-splash.hidden {
  opacity: 0;
  pointer-events: none;
}
.loading-splash-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.loading-logo {
  font-family: var(--display);
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text);
}
.loading-logo span { color: var(--accent-code); }
.loading-dots {
  display: flex;
  gap: 8px;
}
.loading-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-code);
  opacity: 0.3;
  animation: loadDot 1.2s ease-in-out infinite;
}
.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes loadDot {
  0%, 80%, 100% { opacity: 0.2; transform: scale(0.8); }
  40%           { opacity: 1;   transform: scale(1.2); }
}

/* ====== Author Signature ====== */
.author-signature {
  position: fixed;
  bottom: 12px;
  right: 16px;
  font-size: 11px;
  color: var(--text);
  opacity: 0.55;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  pointer-events: none;
  z-index: 10;
  transition: opacity 0.2s, color 0.2s;
  white-space: nowrap;
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
}
.author-signature:hover {
  opacity: 1;
  pointer-events: auto;
  background: rgba(91,143,255,0.08);
  border-color: rgba(91,143,255,0.25);
  color: var(--accent-code);
}
/* Hide on mobile to not overlap nav */
@media (max-width: 768px) {
  .author-signature { display: none; }
}