:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: rgb(22 96 156);
  --secondary: rgb(0 179 0);
  --border: #d1d5db;
  --accent-bg: #edf5fb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at top, #e7f3ef 0%, #f5f7fa 45%, #eef2f7 100%);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
}

a { color: var(--primary); }
code { font-family: "SFMono-Regular", Menlo, monospace; }

.app {
  max-width: 1080px;
  margin: 0 auto;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 12px;
  padding: 16px;
}

.simple-app {
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  display: block;
}

h1, h2, h3 { color: var(--primary); }
.topbar h1, .auth-card h1 { margin: 0; font-size: 1.18rem; }
.subtitle { margin: 2px 0 0; color: var(--muted); font-size: 0.82rem; }
.nav-link { font-size: 0.9rem; font-weight: 700; text-decoration: none; }
.nav-link:hover { text-decoration: underline; }
.top-actions { display: flex; gap: 10px; align-items: center; }

.tabs {
  display: inline-flex;
  gap: 8px;
  width: fit-content;
  padding: 6px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.tab-btn, button, .ghost-btn, input, select, textarea {
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.95rem;
}

button, .tab-btn {
  padding: 10px 14px;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.ghost-btn {
  background: #fff;
  color: var(--primary);
  padding: 10px 14px;
}

.tab-btn { background: transparent; color: var(--muted); border-color: transparent; }
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel[hidden] { display: none; }
.simple-app #chatPanel.active {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 12px;
  min-height: 0;
  overflow: hidden;
}

.simple-app #docsPanel.active {
  min-height: 0;
  overflow-y: auto;
}
.chat-filters {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.chat-filters label {
  max-width: none;
}
.chat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  overflow-y: auto;
  min-height: 60vh;
  display: grid;
  gap: 10px;
}
.msg { border: 1px solid var(--border); border-radius: 12px; padding: 10px; background: #f9fafb; }
.msg.user { border-color: #8fc0e8; background: var(--accent-bg); }
.role { font-weight: 700; font-size: 0.83rem; margin-bottom: 6px; color: var(--primary); }
.content { line-height: 1.45; }
.citations { margin-top: 8px; font-size: 0.78rem; color: #6b7280; font-style: italic; line-height: 1.35; }
.composer {
  position: sticky;
  bottom: 0;
  z-index: 10;
  background: rgba(245, 247, 250, 0.92);
  backdrop-filter: blur(2px);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}
input, select, textarea { width: 100%; padding: 10px; background: #fff; color: var(--text); }
textarea { min-height: 110px; resize: vertical; }
label { display: grid; gap: 6px; color: var(--muted); font-size: 0.82rem; }
button.loading { display: inline-flex; align-items: center; gap: 8px; }
.spinner { width: 14px; height: 14px; border: 2px solid rgba(255,255,255,0.35); border-top-color: #fff; border-radius: 50%; animation: spin 0.8s linear infinite; }
.hourglass { display: inline-block; font-size: 0.95rem; line-height: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

.documents-card, .admin-card, .auth-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}
.documents-card { display: grid; gap: 18px; }
.documents-card h2, .documents-card h3, .documents-card p { margin: 0; }
.documents-intro, .helper-text { color: var(--muted); line-height: 1.45; }
.doc-group { display: grid; gap: 8px; }
.letter-list { margin: 0 0 0 5px; list-style: none; counter-reset: doc-item; display: grid; gap: 8px; }
.letter-list li { counter-increment: doc-item; line-height: 1.45; }
.letter-list li::before { content: counter(doc-item, lower-alpha) ". "; color: var(--secondary); font-weight: 700; }

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-card { width: min(460px, 100%); display: grid; gap: 16px; }
.auth-card-wide { width: min(760px, 100%); }
.auth-brand { margin-bottom: 6px; }
.stack-form, .grid-form { display: grid; gap: 12px; }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.full-row { grid-column: 1 / -1; }
.form-actions { display: flex; justify-content: flex-start; }
.auth-link-row { margin: 0; color: var(--muted); }

.flash {
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.92rem;
  border: 1px solid var(--border);
}
.flash.success { background: #ecfdf5; border-color: #86efac; }
.flash.error { background: #fef2f2; border-color: #fca5a5; }
.flash.info { background: #eff6ff; border-color: #93c5fd; }

.admin-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.admin-card { display: grid; gap: 12px; }
.full-span { grid-column: 1 / -1; }
.settings-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.kv-list { display: grid; gap: 8px; margin: 0; }
.kv-list div { display: grid; gap: 2px; }
.kv-list dt { font-size: 0.8rem; color: var(--muted); }
.kv-list dd { margin: 0; font-weight: 700; }
.stack-list { display: grid; gap: 10px; }
.list-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f9fafb;
}
.list-row.compact { align-items: flex-start; }
.inline-form, .top-gap { margin-top: 8px; }

button:hover { filter: brightness(0.98); }
button:disabled, input:disabled { opacity: 0.75; cursor: default; }

@media (max-width: 840px) {
  .admin-grid, .settings-grid, .two-col { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .composer { grid-template-columns: 1fr; }
  .top-actions { width: 100%; flex-wrap: wrap; }
  .chat-filters { grid-template-columns: 1fr; }
}