:root {
  --bg: #0f1220;
  --bg-soft: #171b2e;
  --card: #1c2138;
  --card-border: #2a3050;
  --text: #eef0fb;
  --text-muted: #9aa1c4;
  --accent: #6c8cff;
  --accent-strong: #8f6cff;
  --accent-text: #ffffff;
  --success: #4ade80;
  --danger: #f87171;
  --radius: 14px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.bg-decor {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px circle at 15% -10%, rgba(108, 140, 255, 0.25), transparent 60%),
    radial-gradient(500px circle at 100% 10%, rgba(143, 108, 255, 0.18), transparent 55%),
    var(--bg);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: white;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 20px rgba(108, 140, 255, 0.35);
}

.brand h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.subtitle {
  margin: 0.1rem 0 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.badge {
  font-size: 0.75rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  white-space: nowrap;
}

.badge-muted {
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
}

.badge-online {
  color: var(--success);
  background: rgba(74, 222, 128, 0.12);
  border-color: rgba(74, 222, 128, 0.35);
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0.5rem 1.25rem 3rem;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.stack .card {
  margin-bottom: 0;
}

.card-header {
  margin-bottom: 1.1rem;
}

.card-header.row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.card-header h2 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  font-weight: 650;
}

.card-hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.form-grid {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.form-inline {
  flex-direction: row;
  align-items: flex-end;
  flex-wrap: wrap;
}

.form-inline label {
  flex: 1;
  min-width: 160px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

input {
  padding: 0.65rem 0.75rem;
  font-size: 0.95rem;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: var(--bg-soft);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input::placeholder {
  color: #6b7194;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108, 140, 255, 0.2);
}

.btn {
  appearance: none;
  border: none;
  border-radius: 10px;
  padding: 0.7rem 1.1rem;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.08s ease, opacity 0.15s ease, box-shadow 0.15s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--accent-text);
  box-shadow: 0 8px 20px rgba(108, 140, 255, 0.3);
}

.btn-primary:hover {
  opacity: 0.92;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border: 1px solid var(--card-border);
  padding: 0.5rem 0.85rem;
  font-size: 0.82rem;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.status {
  min-height: 1.1rem;
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.status.status-ok {
  color: var(--success);
}

.status.status-error {
  color: var(--danger);
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--card-border);
  border-radius: 10px;
  max-height: 220px;
  overflow-y: auto;
  background: var(--bg-soft);
}

.list li {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.88rem;
}

.list li:last-child {
  border-bottom: none;
}

.list-empty {
  color: var(--text-muted);
  font-style: italic;
}

.list-files li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.list-files li::before {
  content: "📄";
}

.list-chat li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.list-chat li .chat-body {
  color: var(--text);
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tab-btn {
  appearance: none;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.82rem;
  cursor: pointer;
}

.tab-btn.active {
  color: var(--accent-text);
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-color: transparent;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0.75rem 0 1rem;
}

@media (max-width: 480px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

.list-picker {
  max-height: 180px;
}

.list-picker li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.list-picker li input {
  padding: 0;
  width: auto;
}

.list-picker li.picked {
  background: rgba(108, 140, 255, 0.12);
}

.list-channels li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  cursor: pointer;
}

.list-channels li:hover {
  background: rgba(255, 255, 255, 0.04);
}

.chip {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  white-space: nowrap;
}

footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
}

@media (max-width: 480px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .card {
    padding: 1.1rem;
  }
}