:root {
  color-scheme: light;
  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-200: #fde68a;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--slate-900);
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; }
button { cursor: pointer; }

/* ---------- Login ---------- */
.login-page {
  min-height: 100dvh;
  background: linear-gradient(135deg, var(--slate-50), rgba(255, 251, 235, 0.3), var(--slate-100));
}
.page-center {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.login-card {
  width: 100%;
  max-width: 32rem;
  background: #fff;
  border-radius: 1rem;
  border: 1px solid rgba(253, 230, 138, 0.8);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
  padding: 2rem;
}
.login-form { margin-top: 0.5rem; }

.brand-header { text-align: center; margin-bottom: 2rem; }
.brand-avatar-wrap {
  width: 6rem;
  height: 6rem;
  max-width: 96px;
  max-height: 96px;
  margin: 0 auto 1rem;
  border-radius: 999px;
  overflow: hidden;
  border: 2px solid rgba(251, 191, 36, 0.6);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
  flex-shrink: 0;
}
.brand-avatar-wrap.compact { width: 3.5rem; height: 3.5rem; max-width: 56px; max-height: 56px; }
.brand-avatar {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}
.brand-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--slate-900);
}
.brand-title.compact { font-size: 1.125rem; }
.brand-tagline {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  color: var(--slate-500);
}
.brand-acronym {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  text-align: left;
}
@media (min-width: 480px) {
  .brand-acronym { grid-template-columns: 1fr 1fr 1fr; }
}
.brand-acronym-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.625rem;
  border-radius: 0.5rem;
  background: linear-gradient(to right, var(--amber-50), var(--slate-50));
  border: 1px solid rgba(253, 230, 138, 0.8);
  font-size: 0.75rem;
  color: var(--slate-700);
  line-height: 1.2;
}
.brand-letter {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 0.375rem;
  background: var(--amber-500);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.brand-partners {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--slate-100);
}
.brand-partners p {
  margin: 0 0 0.75rem;
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}
.brand-partner-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.brand-partner-slot {
  width: 7rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}
.brand-partner-logos img,
.brand-partner-slot img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.field { margin-bottom: 1rem; }
.field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--slate-700);
  margin-bottom: 0.25rem;
}
.field input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--slate-300);
  border-radius: 0.5rem;
}
.field input:focus {
  outline: none;
  border-color: var(--amber-500);
  box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.25);
}

.btn {
  border: none;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: 0.15s ease;
}
.btn-primary {
  width: 100%;
  padding: 0.625rem 1rem;
  background: linear-gradient(to right, var(--amber-500), var(--amber-600));
  color: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.btn-primary:hover { background: linear-gradient(to right, var(--amber-600), var(--amber-700)); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary {
  width: 100%;
  padding: 0.625rem 1rem;
  margin-bottom: 0.5rem;
  border: 1px solid var(--amber-200);
  background: var(--amber-50);
  color: var(--amber-900);
  font-size: 0.875rem;
}
.btn-block { width: 100%; padding: 0.5rem 0.75rem; font-size: 0.875rem; }

.alert {
  padding: 0.625rem 0.75rem;
  border-radius: 0.75rem;
  font-size: 0.75rem;
  line-height: 1.5;
  margin-bottom: 1rem;
}
.alert-info { background: var(--amber-50); border: 1px solid var(--amber-100); color: var(--amber-900); }
.alert-error { background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c; }

/* ---------- Chat layout ---------- */
.chat-page {
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--slate-50);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: #fff;
  border-bottom: 1px solid var(--amber-100);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  flex-shrink: 0;
}
.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}
.header-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--amber-300);
  flex-shrink: 0;
}
.header-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}
.header-text { min-width: 0; }
.header-text h1 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--slate-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.header-text p {
  margin: 0;
  font-size: 0.7rem;
  color: var(--slate-500);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.menu-btn {
  display: none;
  background: transparent;
  border: none;
  font-size: 1.25rem;
  padding: 0.35rem 0.5rem;
  border-radius: 0.5rem;
  color: var(--slate-600);
}
.menu-btn:hover { background: var(--slate-100); }

.chip {
  border: 1px solid var(--slate-200);
  background: #fff;
  color: var(--slate-600);
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 600;
  white-space: nowrap;
}
.chip:hover { background: var(--slate-50); }
.chip.active { background: var(--amber-100); border-color: var(--amber-300); color: var(--amber-900); }
.chip-muted { color: var(--slate-600); }

.chat-layout {
  display: flex;
  flex: 1;
  min-height: 0;
  position: relative;
}

.sidebar {
  width: 18rem;
  flex-shrink: 0;
  background: #fff;
  border-right: 1px solid var(--amber-100);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-section {
  padding: 0.75rem;
  border-bottom: 1px solid var(--amber-50);
}
.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}
.sidebar-prompts {
  max-height: 12rem;
  overflow-y: auto;
}
.section-label {
  margin: 0 0 0.5rem;
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}
.section-hint {
  margin: 0 0 0.5rem;
  font-size: 0.625rem;
  color: var(--slate-400);
  line-height: 1.35;
}
.sidebar-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.link-danger {
  background: none;
  border: none;
  color: #ef4444;
  font-size: 0.625rem;
  padding: 0;
}
.link-danger:hover { color: #b91c1c; }
.link-muted {
  background: none;
  border: none;
  color: var(--slate-400);
  font-size: 0.625rem;
  margin-top: 0.25rem;
  padding: 0;
}

.conv-list { display: flex; flex-direction: column; gap: 0.25rem; }
.conv-item {
  display: flex;
  align-items: stretch;
  border-radius: 0.5rem;
  border: 1px solid transparent;
}
.conv-item.active {
  background: var(--amber-50);
  border-color: var(--amber-200);
}
.conv-item:hover:not(.active) { background: var(--slate-50); }
.conv-btn {
  flex: 1;
  min-width: 0;
  text-align: left;
  background: none;
  border: none;
  padding: 0.5rem;
  font-size: 0.75rem;
  color: var(--slate-600);
}
.conv-item.active .conv-btn { color: var(--amber-900); }
.conv-title { display: block; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-date { display: block; font-size: 0.625rem; color: var(--slate-400); margin-top: 0.125rem; }
.conv-del {
  background: none;
  border: none;
  color: var(--slate-400);
  padding: 0 0.5rem;
  font-size: 1rem;
}
.conv-del:hover { color: #ef4444; }

.upload-zone {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 2px dashed var(--amber-200);
  border-radius: 0.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--amber-800);
  cursor: pointer;
}
.upload-zone:hover { background: var(--amber-50); }
.doc-list { margin-top: 0.5rem; }
.doc-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem;
  font-size: 0.75rem;
  background: var(--slate-50);
  border-radius: 0.375rem;
  padding: 0.25rem 0.5rem;
  margin-bottom: 0.25rem;
}
.doc-row span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-row button {
  background: none;
  border: none;
  color: var(--slate-400);
  font-size: 1rem;
}
.doc-row button:hover { color: #ef4444; }

.quick-prompts { display: flex; flex-direction: column; gap: 0.25rem; }
.quick-prompt {
  text-align: left;
  font-size: 0.6875rem;
  line-height: 1.35;
  padding: 0.375rem 0.5rem;
  border-radius: 0.5rem;
  background: rgba(255, 251, 235, 0.8);
  color: var(--amber-900);
  border: 1px solid var(--amber-100);
}
.quick-prompt:hover { background: var(--amber-100); }

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.messages-wrap {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}
.chat-messages {
  max-width: 48rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.empty-state {
  text-align: center;
  margin-top: 3rem;
  color: var(--slate-500);
}
.empty-avatar {
  width: 5rem;
  height: 5rem;
  margin: 0 auto 1rem;
  border-radius: 999px;
  overflow: hidden;
  border: 2px solid var(--amber-400);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.empty-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}
.empty-greeting {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--slate-700);
}
.empty-text { margin: 0.5rem 0 0; }

.msg-row {
  display: flex;
  gap: 0.5rem;
  max-width: 48rem;
  margin: 0 auto;
  width: 100%;
}
.msg-row.user { justify-content: flex-end; }
.msg-row.assistant { justify-content: flex-start; }
.msg-avatar-wrap {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--amber-200);
  flex-shrink: 0;
  margin-top: 0.25rem;
}
.msg-avatar-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
}
.msg-bubble {
  max-width: 85%;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.msg-bubble.user {
  background: linear-gradient(to right, var(--amber-500), var(--amber-600));
  color: #fff;
}
.msg-bubble.assistant {
  background: #fff;
  border: 1px solid var(--slate-200);
  color: var(--slate-800);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.chat-footer {
  border-top: 1px solid var(--slate-200);
  background: #fff;
  padding: 0.75rem 1rem;
  flex-shrink: 0;
}
.chat-input-row {
  max-width: 48rem;
  margin: 0 auto;
  display: flex;
  gap: 0.5rem;
}
.chat-input-row input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--slate-300);
  border-radius: 0.75rem;
  font-size: 0.95rem;
}
.chat-input-row input:focus {
  outline: none;
  border-color: var(--amber-500);
  box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.2);
}
.chat-input-row .btn-primary {
  width: auto;
  padding: 0.75rem 1.25rem;
  border-radius: 0.75rem;
  flex-shrink: 0;
}
.footer-info {
  text-align: center;
  font-size: 0.875rem;
  color: var(--amber-700);
  margin: 0.5rem 0 0;
}
.chat-alert { margin: 0.5rem 1rem 0; max-width: 48rem; margin-left: auto; margin-right: auto; }

.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  z-index: 40;
}
.overlay.open { display: block; }

@media (max-width: 1024px) {
  .menu-btn { display: inline-block; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 50;
    width: min(100vw, 18rem);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
  }
  .sidebar.open { transform: translateX(0); }
  .header-right .chip:not(#logoutBtn) { display: none; }
}

@media (max-width: 480px) {
  .login-card { padding: 1.25rem; }
  .brand-acronym { grid-template-columns: 1fr; }
}