@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&family=Open+Sans:wght@400;500;600;700&display=swap');
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #57449b;
  --primary-hover: #463a7e;
  --primary-light: #e8e3f5;
  --primary-dark: #2d2552;
  --danger: #dc2626;
  --warning: #f59e0b;
  --success: #16a34a;
  --bg: #f5f5f8;
  --card: #ffffff;
  --text: #111111;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.10);
  --nav-height: 70px;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
h1, h2, h3, h4, h5, h6 { font-family: 'Montserrat', sans-serif; font-weight: 700; }

/* Loading screen */
#dp-load {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(255,255,255,0.95);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 24px;
  opacity: 1; visibility: visible;
  transition: all .45s ease-out;
}
#dp-load.loader-removed { opacity: 0; visibility: hidden; pointer-events: none; }
.dp-loader-spinner {
  width: 48px; height: 48px;
  border: 4px solid #e5e7eb;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: dp-spin .7s linear infinite;
}
@keyframes dp-spin { to { transform: rotate(360deg); } }
.dp-loader-text { font-family: 'Montserrat', sans-serif; font-size: 14px; color: var(--text-muted); font-weight: 500; }

/* Nav */
.dp-nav {
  height: var(--nav-height);
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255,255,255,.92);
}
.dp-nav-inner {
  max-width: 1250px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.dp-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.dp-logo img { height: 42px; width: auto; }
.dp-logo span {
  font-family: 'Montserrat', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -.02em;
}
.dp-nav-links { display: flex; align-items: center; gap: 8px; }
.dp-nav-links .btn { font-family: 'Montserrat', sans-serif; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; padding: 8px 18px; }

/* Auth pages */
.auth-page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg);
}
.auth-page .dp-nav { position: relative; }
.auth-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
}
.auth-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--border);
}
.auth-card h1 {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 2px;
}
.auth-card .subtitle {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 24px;
}

/* Microsoft SSO button */
.btn-microsoft {
  background: #ffffff;
  color: #333333;
  border: 1.5px solid #d1d5db;
  font-family: 'Segoe UI', 'Open Sans', sans-serif;
  font-weight: 600;
  font-size: 14px;
  padding: 12px 22px;
  gap: 10px;
  transition: all .15s;
}
.btn-microsoft:hover {
  background: #f5f5f5;
  border-color: #8b8b8b;
  box-shadow: 0 1px 4px rgba(0,0,0,.10);
}
.btn-microsoft svg { flex-shrink: 0; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  letter-spacing: .02em;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: 'Open Sans', sans-serif;
  background: var(--card);
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(87,68,155,.12);
}
.form-group small { display: block; margin-top: 4px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  font-family: 'Montserrat', sans-serif;
  border: none;
  cursor: pointer;
  transition: all .15s;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); box-shadow: 0 2px 8px rgba(87,68,155,.25); }
.btn-secondary { background: #f1f5f9; color: var(--text); }
.btn-secondary:hover { background: #e2e8f0; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: #f1f5f9; color: var(--text); }
.btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: white; }
.btn-sm { padding: 6px 14px; font-size: 11px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* Chat layout */
.chat-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
}
.chat-page .dp-nav { flex-shrink: 0; }
.chat-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  max-width: 1250px;
  width: 100%;
  margin: 0 auto;
  padding: 16px;
  gap: 16px;
}
.chat-sidebar {
  width: 280px;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}
.chat-sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  background: #fafafa;
}
.chat-sidebar-header h2 { font-family: 'Montserrat', sans-serif; font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--primary); }
.chat-sidebar-header .user-info {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
.chat-conversations {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.conv-item {
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 2px;
  transition: background .1s;
}
.conv-item:hover { background: #f1f5f9; }
.conv-item.active { background: var(--primary-light); }
.conv-item .title { font-size: 13px; font-weight: 600; color: var(--text); }
.conv-item .preview { font-size: 12px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-item .meta { font-size: 11px; color: var(--text-light); margin-top: 2px; }

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}
.chat-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.chat-header h3 { font-family: 'Montserrat', sans-serif; font-size: 14px; font-weight: 600; }
.chat-header .actions { display: flex; gap: 8px; }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #fafbfc;
}
.message {
  max-width: 75%;
  padding: 10px 16px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.55;
  animation: fadeIn .25s;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.message.user {
  align-self: flex-end;
  background: var(--primary);
  color: white;
  border-bottom-right-radius: 4px;
}
.message.ai {
  align-self: flex-start;
  background: #f1f5f9;
  color: var(--text);
  border-bottom-left-radius: 4px;
}
.message.specialist {
  align-self: flex-start;
  background: #fef3c7;
  color: var(--text);
  border-bottom-left-radius: 4px;
  border: 1px solid #fde68a;
}
.message.system {
  align-self: center;
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
}
.message .sender-label {
  font-size: 10px;
  font-weight: 700;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 4px;
  opacity: .7;
}

.chat-input {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--card);
  display: flex;
  gap: 8px;
}
.chat-input input {
  flex: 1;
  padding: 10px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: 'Open Sans', sans-serif;
  outline: none;
  transition: border-color .15s;
}
.chat-input input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(87,68,155,.10); }
.chat-input input:disabled { background: #f8fafc; }

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  padding: 40px;
  text-align: center;
}
.empty-state .icon { font-size: 52px; margin-bottom: 16px; opacity: .5; }
.empty-state h3 { font-family: 'Montserrat', sans-serif; font-size: 16px; color: var(--text); margin-bottom: 6px; }
.empty-state p { font-size: 13px; max-width: 380px; color: var(--text-muted); }

.escalation-banner {
  padding: 10px 20px;
  background: #fef3c7;
  border-bottom: 1px solid #fde68a;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.escalation-banner .status { font-weight: 600; font-family: 'Montserrat', sans-serif; }
.escalation-banner .status.open { color: #b45309; }
.escalation-banner .status.resolved { color: var(--success); }

/* Alerts */
.alert {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 16px;
}
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

/* Tabs */
.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border);
}
.auth-tab {
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 600;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all .15s;
}
.auth-tab:hover { color: var(--text); }
.auth-tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* Role selector */
.role-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}
.role-grid > .role-card:last-child:nth-child(3) {
  grid-column: 1 / -1;
}
.role-card {
  padding: 24px 16px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  text-align: center;
  cursor: pointer;
  transition: all .15s;
  text-decoration: none;
  color: var(--text);
  background: var(--card);
}
.role-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.role-card .icon { font-size: 28px; margin-bottom: 8px; }
.role-card .name { font-family: 'Montserrat', sans-serif; font-size: 15px; font-weight: 700; color: var(--primary-dark); }
.role-card .desc { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

.link { color: var(--primary); text-decoration: none; font-size: 13px; font-weight: 600; }
.link:hover { text-decoration: underline; }

.hidden { display: none !important; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #9ca3af; }

/* Badges */
.badge {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 100px;
  font-weight: 600;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.badge-escalated { background: #fef3c7; color: #92400e; }
.badge-active { background: #d4f5ed; color: #065f46; }

/* Footer */
.dp-footer {
  text-align: center;
  padding: 16px 24px;
  font-size: 12px;
  color: var(--text-light);
  border-top: 1px solid var(--border);
  background: var(--card);
}

/* PWA standalone mode */
@media all and (display-mode: standalone) {
  .dp-nav { padding-top: env(safe-area-inset-top, 0px); }
  .chat-page, .auth-page { padding-top: env(safe-area-inset-top, 0px); }
  .dp-footer { padding-bottom: env(safe-area-inset-bottom, 0px); }
  body { -webkit-touch-callout: none; -webkit-user-select: none; user-select: none; }
  /* draggable area for PWA title bar */
  .dp-nav { -webkit-app-region: drag; }
  .dp-nav .btn, .dp-nav input, .dp-nav select { -webkit-app-region: no-drag; }
}

/* PWA install banner */
.pwa-banner {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--primary-dark);
  color: white;
  padding: 12px 16px;
  padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  z-index: 9998;
  font-size: 13px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 -4px 20px rgba(0,0,0,.2);
}
.pwa-banner.show { display: flex; }
.pwa-banner .pwa-text { flex: 1; line-height: 1.4; }
.pwa-banner .pwa-text strong { font-family: 'Montserrat', sans-serif; }
.pwa-banner .pwa-actions { display: flex; gap: 8px; flex-shrink: 0; }
.pwa-banner .btn { font-size: 12px; padding: 8px 16px; }
.pwa-banner .btn-primary { background: white; color: var(--primary-dark); }
.pwa-banner .btn-primary:hover { background: #f0f0f0; }
.pwa-banner .btn-ghost { color: rgba(255,255,255,.7); }

.mobile-only { display: none; }

@media (max-width: 768px) {
  .mobile-only { display: inline-flex; }
  .desktop-only { display: none !important; }
  
  .chat-body { padding: 8px; flex-direction: column; }
  .chat-sidebar { width: 100%; position: fixed; z-index: 10; height: calc(100% - var(--nav-height)); top: var(--nav-height); left: 0; border-radius: 0; }
  .chat-sidebar.hidden-mobile { display: none; }
  .chat-main { border-radius: 8px; min-height: 60vh; }
  .message { max-width: 90%; }
  .auth-card { padding: 24px; }
  .role-grid { grid-template-columns: 1fr; }
  .dp-nav { padding: 0 12px; }
  .dp-nav-links { gap: 4px; }
  .dp-nav-links .btn { font-size: 10px; padding: 6px 10px; }
  .dp-logo span { font-size: 15px; }
  .dp-logo img { height: 32px; }
  .chat-sidebar-header { padding: 12px; }
  .chat-conversations { padding: 4px; }
  .conv-item { padding: 10px; }
  .chat-messages { padding: 12px; }
  .chat-input { padding: 10px 12px; }
  .chat-input input { font-size: 16px; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .table-wrap { border-radius: 0; margin: 0 -8px; }
  .sandbox-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .auth-card { padding: 16px; box-shadow: none; border: none; }
  .auth-body { padding: 16px; }
  .dp-nav { height: 56px; }
  :root { --nav-height: 56px; }
  .chat-header { padding: 10px 14px; }
  .chat-header h3 { font-size: 13px; }
  .btn { padding: 10px 16px; font-size: 12px; }
  .chat-input input { padding: 12px 14px; }
  .table-wrap { font-size: 12px; }
  th, td { padding: 8px 10px; }
  .stat-card { padding: 12px 14px; }
  .stat-card .value { font-size: 20px; }
}