:root {
  --bg: #0f1115;
  --bg-panel: #171a21;
  --bg-hover: #1f232d;
  --border: #2a2f3a;
  --text: #e4e7ec;
  --text-dim: #9aa1ad;
  --accent: #4f8cff;
  --user-bg: #23406e;
  --error: #ff6b6b;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.hidden { display: none !important; }

/* --- Авторизация --- */
.auth-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: 360px;
}

.auth-card h1 { font-size: 22px; margin-bottom: 4px; }
.subtitle { color: var(--text-dim); font-size: 13px; margin-bottom: 20px; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  flex: 1;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  cursor: pointer;
}
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

#auth-form { display: flex; flex-direction: column; gap: 10px; }
input, textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
}
input:focus, textarea:focus { border-color: var(--accent); }

button {
  font-family: inherit;
  cursor: pointer;
}

#auth-submit {
  padding: 10px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
}
.error { color: var(--error); font-size: 13px; margin-top: 10px; min-height: 16px; }

/* --- Основной экран --- */
.app-screen { display: flex; height: 100vh; }

.sidebar {
  width: 280px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.logo { font-weight: 600; }
#new-chat {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  width: 28px;
  height: 28px;
  font-size: 18px;
  line-height: 1;
}

.history-list { flex: 1; overflow-y: auto; padding: 8px; }
.history-item {
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.history-item:hover { background: var(--bg-hover); color: var(--text); }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  font-size: 13px;
}
.user-email { color: var(--text-dim); margin-bottom: 4px; }
.quota { color: var(--accent); margin-bottom: 8px; }
.logout {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  padding: 5px 12px;
  font-size: 13px;
}
.logout:hover { color: var(--text); }

/* --- Чат --- */
.chat { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.welcome {
  margin: auto;
  text-align: center;
  color: var(--text-dim);
}
.welcome h2 { color: var(--text); margin-bottom: 8px; }

.msg { max-width: 760px; line-height: 1.55; font-size: 15px; }
.msg.user {
  align-self: flex-end;
  background: var(--user-bg);
  border-radius: 12px 12px 4px 12px;
  padding: 10px 14px;
}
.msg.assistant { align-self: flex-start; white-space: pre-wrap; }
.msg.assistant .answer { padding: 4px 0; }
.msg.loading { color: var(--text-dim); font-style: italic; }
.msg.error { color: var(--error); }

.citations { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.citation {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-panel);
  font-size: 13px;
}
.citation-head {
  padding: 8px 12px;
  cursor: pointer;
  color: var(--accent);
  user-select: none;
}
.citation-head::before { content: "▸ "; }
.citation.open .citation-head::before { content: "▾ "; }
.citation-body {
  display: none;
  padding: 0 12px 10px;
  color: var(--text-dim);
}
.citation.open .citation-body { display: block; }
.citation-body .c-title { color: var(--text); margin-bottom: 4px; }
.citation-body .c-path { font-size: 12px; margin-bottom: 6px; }
.citation-body .c-quote { white-space: pre-wrap; }

.ask-form {
  display: flex;
  gap: 10px;
  padding: 14px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
}
#question { flex: 1; resize: none; }
#send-btn {
  padding: 0 22px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 15px;
}
#send-btn:disabled { opacity: 0.5; cursor: default; }

/* --- Админка --- */
.admin-btn {
  display: block;
  width: 100%;
  margin-bottom: 8px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent);
  font-size: 13px;
}
.admin-btn:hover { background: var(--accent); color: #fff; }

.admin-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  z-index: 100;
  overflow-y: auto;
}

.admin-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 900px;
  max-width: 100%;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.admin-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
}
.admin-close:hover { color: var(--text); }

.admin-create {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}
.admin-create input { flex: 1; }
.admin-create button {
  padding: 0 18px;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
}

.admin-users { overflow-x: auto; }
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.admin-table th, .admin-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.admin-table th { color: var(--text-dim); font-weight: 500; }
.admin-table .actions { display: flex; gap: 6px; flex-wrap: wrap; }
.admin-table .actions button {
  padding: 4px 8px;
  font-size: 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
}
.admin-table .actions button:hover { color: var(--text); border-color: var(--accent); }
.admin-table .actions button.danger:hover { color: var(--error); border-color: var(--error); }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-panel);
  border: 1px solid var(--accent);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 14px;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 90vw;
}
.toast button {
  padding: 6px 12px;
  background: var(--accent);
  border: none;
  border-radius: 6px;
  color: #fff;
  font-size: 13px;
}

/* --- Кнопка отчёта об ошибке --- */
.report-btn {
  margin-top: 8px;
  padding: 4px 10px;
  font-size: 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
}
.report-btn:hover { color: var(--error); border-color: var(--error); }
.report-btn:disabled { opacity: 0.5; }

/* --- Бренд NORMACH --- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-text {
  font-weight: 700;
  letter-spacing: 5px;
  background: linear-gradient(90deg, var(--accent), #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 20px;
}
.brand-sm .brand-text { font-size: 15px; letter-spacing: 4px; }
.brand-xl { flex-direction: column; gap: 6px; }
.brand-xl .brand-text { font-size: 56px; letter-spacing: 6px; }
.brand-xl .brand-icon { font-size: 40px; }

@keyframes brandGlow {
  0%, 100% { filter: drop-shadow(0 0 4px rgba(79, 140, 255, 0.25)); }
  50% { filter: drop-shadow(0 0 18px rgba(34, 211, 238, 0.55)); }
}
.brand-glow { animation: brandGlow 3s ease-in-out infinite; }

@keyframes brandPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.65; transform: scale(0.96); }
}
.brand-pulse { animation: brandPulse 1.4s ease-in-out infinite; }

/* --- Пустое состояние --- */
.welcome-tagline {
  margin-top: 10px;
  font-weight: 300;
  color: var(--text-dim);
  letter-spacing: 1px;
}
.examples {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  max-width: 560px;
}
.example-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-dim);
  padding: 14px 16px;
  font-size: 13px;
  text-align: left;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
}
.example-card:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}

/* --- Анимация ожидания ответа --- */
.msg.assistant.pending { width: min(560px, 100%); }
.pending-brand { margin-bottom: 12px; }
.skeleton-lines { display: flex; flex-direction: column; gap: 10px; }
.skeleton-lines span {
  display: block;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--bg-panel) 25%, var(--bg-hover) 50%, var(--bg-panel) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.3s linear infinite;
}
.skeleton-lines span:nth-child(2) { width: 82%; }
.skeleton-lines span:nth-child(3) { width: 64%; }
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.pending-status {
  margin-top: 14px;
  font-size: 13px;
  color: var(--text-dim);
  transition: opacity 0.4s;
}
.pending-status.fade { opacity: 0; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}
.msg.assistant { animation: fadeIn 0.35s ease; }
@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}
.msg.pending.fading { animation: fadeOut 0.3s ease forwards; }

/* --- Спиннер на кнопке отправки --- */
#send-btn.sending {
  color: transparent;
  position: relative;
  pointer-events: none;
}
#send-btn.sending::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#question:disabled { opacity: 0.6; }

/* --- Кнопка очистки кэша в админке --- */
.danger-btn {
  padding: 0 14px;
  background: transparent;
  border: 1px solid var(--error);
  border-radius: 8px;
  color: var(--error);
  white-space: nowrap;
}
.danger-btn:hover { background: var(--error); color: #fff; }

/* --- Markdown в ответах ассистента --- */
.msg.assistant .answer p { margin: 0 0 8px; }
.msg.assistant .answer p:last-child { margin-bottom: 0; }
.msg.assistant .answer ul {
  margin: 4px 0 10px;
  padding-left: 20px;
}
.msg.assistant .answer li { margin-bottom: 4px; }
.msg.assistant .answer strong { color: #fff; }