:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f0f1f4;
  --border: #e2e4e9;
  --text: #16181d;
  --text-muted: #666b76;
  --primary: #3457d5;
  --primary-hover: #2a46b3;
  --danger: #c53030;
  --danger-bg: #fdecec;
  --shadow: 0 1px 2px rgba(16, 18, 22, 0.04), 0 8px 24px rgba(16, 18, 22, 0.06);
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a21;
    --surface-2: #1e222a;
    --border: #2a2f3a;
    --text: #eef0f4;
    --text-muted: #9aa1ad;
    --primary: #6c8bff;
    --primary-hover: #86a0ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: var(--primary);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.whoami {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2.5rem 1.25rem;
  gap: 1rem;
}

.card {
  width: 100%;
  max-width: 640px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.card.center {
  text-align: center;
}

.card h1 {
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
}

.muted {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.section-head h1 {
  margin: 0;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-top: 1.25rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

input[type="text"],
input[type="password"],
input[type="search"] {
  font: inherit;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
}

input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.btn {
  font: inherit;
  font-weight: 600;
  border-radius: 9px;
  padding: 0.65rem 1.1rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-lg {
  padding: 0.85rem 1.6rem;
  font-size: 1rem;
  margin-top: 1.25rem;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--text-muted);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 1.25rem 0 0.75rem;
}

.toolbar input[type="search"] {
  flex: 1;
}

.toolbar-actions {
  display: flex;
  gap: 0.4rem;
  flex-shrink: 0;
}

.room-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 380px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.room-item {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border);
}

.room-item:last-child {
  border-bottom: none;
}

.room-item label {
  flex: 1;
  flex-direction: row;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  font-size: 0.92rem;
  cursor: pointer;
}

.room-type {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--surface-2);
  border-radius: 5px;
  padding: 0.15rem 0.4rem;
}

.export-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: var(--surface-2);
  overflow: hidden;
  margin: 1rem 0 0.6rem;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s ease;
}

.error {
  color: var(--danger);
  background: var(--danger-bg);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
  font-size: 0.85rem;
}

.footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
}