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

:root {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --primary: #4a90d9;
  --primary-dark: #2f74c0;
  --danger: #e74c3c;
  --success: #27ae60;
  --warning: #f39c12;
  --text: #1a1a2e;
  --text-muted: #6c757d;
  --border: #dee2e6;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.10);
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
}

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

/* ── Layout ── */
.page-center {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
  width: 100%;
  max-width: 420px;
}

.card h1 { font-size: 22px; margin-bottom: 24px; color: var(--text); }

/* ── Nav ── */
.navbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 52px;
  gap: 24px;
  box-shadow: var(--shadow);
}
.navbar .brand { font-weight: 700; font-size: 16px; color: var(--primary); }
.navbar .nav-links { display: flex; gap: 16px; flex: 1; }
.navbar .nav-links a { color: var(--text-muted); font-size: 14px; }
.navbar .nav-links a:hover, .navbar .nav-links a.active { color: var(--primary); text-decoration: none; }
.navbar .user-info { font-size: 13px; color: var(--text-muted); }
.navbar .btn-logout { cursor: pointer; background: none; border: none; color: var(--danger); font-size: 13px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  outline: none;
  transition: border-color .2s;
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background .2s, opacity .2s;
}
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-danger  { background: var(--danger);  color: #fff; }
.btn-danger:hover:not(:disabled) { background: #c0392b; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* ── Tabs ── */
.tabs { display: flex; border-bottom: 2px solid var(--border); margin-bottom: 24px; gap: 4px; }
.tab-btn {
  padding: 8px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-muted);
  transition: color .2s, border-color .2s;
}
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

/* ── Chat ── */
.chat-layout {
  display: grid;
  grid-template-columns: 400px 1fr;
  height: calc(100vh - 52px);
}

.chat-sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  overflow-x: auto;
}
.chat-sidebar h3 { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; text-transform: uppercase; letter-spacing: .5px; padding-left: 10px; }

.file-item {
  padding: 8px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  margin-bottom: 4px;
  white-space: nowrap;
  border: 1px solid transparent;
}
.file-item:hover { background: var(--bg); }
.file-item.selected { background: #e8f0fb; border-color: var(--primary); }
.file-status { font-size: 11px; color: var(--text-muted); }
.file-status.ready { color: var(--success); }
.file-status.error { color: var(--danger); }

.chat-main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 72%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}
.message.user {
  background: var(--primary);
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.message.agent {
  background: var(--surface);
  border: 1px solid var(--border);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.message.waiting {
  background: #fff8e1;
  border: 1px solid #ffe082;
  align-self: flex-start;
  color: #856404;
}
.message.error-msg {
  background: #fdecea;
  border: 1px solid #f5c2c7;
  color: var(--danger);
  align-self: flex-start;
}

.typing-indicator { display: flex; gap: 4px; align-items: center; padding: 8px 4px; }
.typing-indicator span {
  width: 7px; height: 7px; border-radius: 50%; background: var(--text-muted);
  animation: bounce .9s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: .15s; }
.typing-indicator span:nth-child(3) { animation-delay: .3s; }
@keyframes bounce { 0%,60%,100% { transform: translateY(0); } 30% { transform: translateY(-6px); } }

.chat-input-row {
  padding: 16px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}
.chat-input-row textarea {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 12px;
  resize: none;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  max-height: 120px;
}
.chat-input-row textarea:focus { border-color: var(--primary); }

/* ── Upload ── */
.main-content { padding: 32px; max-width: 900px; margin: 0 auto; }
.main-content h2 { margin-bottom: 24px; }

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  margin-bottom: 32px;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--primary); background: #f0f6ff; }
.drop-zone p { color: var(--text-muted); margin-top: 8px; font-size: 13px; }
.drop-zone .drop-icon { font-size: 40px; }

/* ── Table ── */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
th { background: var(--primary); color: #fff; padding: 10px 14px; text-align: left; font-size: 13px; }
td { padding: 9px 14px; border-bottom: 1px solid var(--border); font-size: 13px; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg); }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}
.badge-ready    { background: #d4edda; color: #155724; }
.badge-uploaded { background: #fff3cd; color: #856404; }
.badge-error    { background: #f8d7da; color: #721c24; }
.badge-processing { background: #d1ecf1; color: #0c5460; }
.badge-pending  { background: #fff3cd; color: #856404; }
.badge-approved { background: #d4edda; color: #155724; }
.badge-rejected { background: #f8d7da; color: #721c24; }
.badge-auto_approved { background: #d1ecf1; color: #0c5460; }

/* ── Alerts ── */
.alert { padding: 10px 16px; border-radius: var(--radius); font-size: 13px; margin-bottom: 16px; }
.alert-error   { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }

/* ── Admin ── */
.question-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}
.question-card .q-text { font-size: 14px; margin-bottom: 12px; line-height: 1.5; }
.question-card .q-meta { font-size: 11px; color: var(--text-muted); margin-bottom: 10px; }
.answer-row { display: flex; gap: 8px; }
.answer-row input { flex: 1; }

/* ── Misc ── */
.text-muted { color: var(--text-muted); }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.flex { display: flex; }
.gap-2 { gap: 8px; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

/* ── Mobile ── */
@media (max-width: 768px) {
  /* Navbar */
  .navbar {
    padding: 0 12px;
    gap: 10px;
    height: auto;
    min-height: 52px;
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
  }
  .navbar .user-info { display: none; }
  .navbar .nav-links { gap: 10px; }

  /* Chat: сайдбар сверху, чат снизу */
  .chat-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    height: calc(100vh - 52px);
  }
  .chat-sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 160px;
    padding: 10px 12px;
  }
  .chat-sidebar h3 { margin-bottom: 8px; }

  /* Сообщения */
  .messages { padding: 12px; }
  .message { max-width: 90%; }

  /* Поле ввода */
  .chat-input-row { padding: 10px 12px; }

  /* Страница файлов */
  .main-content { padding: 16px; }
  .drop-zone { padding: 24px 16px; }

  /* Таблица — уменьшаем шрифт и отступы */
  th, td { padding: 7px 10px; font-size: 12px; }

  /* Карточка входа */
  .card { padding: 24px 16px; }

  /* Admin */
  .answer-row { flex-direction: column; }
}