:root {
  --bg: #0b0f17;
  --bg-elevated: #121826;
  --panel: #171f2e;
  --line: #2a3548;
  --text: #e6edf7;
  --muted: #8b9ab5;
  --accent: #5b9dff;
  --accent-dim: #3d6fb8;
  --good: #3ecf8e;
  --warn: #f0b429;
  --bad: #ef6b6b;
  --radius: 12px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2740 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #162032 0%, transparent 50%), var(--bg);
  color: var(--text);
  font: 15px/1.55 "Segoe UI", system-ui, sans-serif;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.hero {
  margin-bottom: 24px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.tab-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  transition: 0.15s ease;
}

a.tab-btn {
  display: inline-block;
  text-decoration: none;
}

a.tab-btn:hover {
  text-decoration: none;
}

.tab-btn:hover {
  color: var(--text);
  border-color: var(--accent-dim);
}

.tab-btn.active {
  background: linear-gradient(180deg, #25406a, #1b3152);
  color: var(--text);
  border-color: var(--accent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.panel {
  display: none;
  background: rgba(23, 31, 46, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.panel.active {
  display: block;
}

.panel h2 {
  margin: 0 0 6px;
  font-size: 1.1rem;
}

.panel .lead {
  margin: 0 0 18px;
  color: var(--muted);
}

.project-card {
  background: rgba(23, 31, 46, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.project-card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.project-card p {
  margin: 0 0 10px;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 14px;
}

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

input,
select,
button,
textarea {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  background: #0d121c;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  border: 1px solid var(--accent-dim);
  background: linear-gradient(180deg, #3567a8, #2a5288);
  color: white;
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.08);
}

button.secondary {
  background: #1e2a3d;
  border-color: var(--line);
  color: var(--text);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

a.button-link {
  text-decoration: none;
}

a.button-link button {
  width: 100%;
}

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: end;
}

.row > * {
  flex: 1;
  min-width: 140px;
}

.result,
.note,
.card {
  background: #0d121c;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
}

.result pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font: 13px/1.5 ui-monospace, Consolas, monospace;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.badge.good {
  color: var(--good);
  border-color: rgba(62, 207, 142, 0.35);
}

.badge.bad {
  color: var(--bad);
  border-color: rgba(239, 107, 107, 0.35);
}

.badge.warn {
  color: var(--warn);
  border-color: rgba(240, 180, 41, 0.35);
}

.section-title {
  margin: 0 0 10px;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-note {
  margin: -4px 0 12px;
  font-size: 0.92rem;
}

.alias-note {
  color: var(--muted);
  font-size: 0.88rem;
}

.room-list {
  display: grid;
  gap: 12px;
}

.room-card {
  display: grid;
  gap: 10px;
  padding: 16px;
  background: #0d121c;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.room-card.active-room {
  border-color: rgba(91, 157, 255, 0.55);
  box-shadow: 0 0 0 1px rgba(91, 157, 255, 0.15);
}

.room-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}

.room-title {
  margin: 0;
  font-size: 1.05rem;
}

.room-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.room-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

footer.site-foot {
  margin-top: 28px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.hidden {
  display: none !important;
}

@media (max-width: 640px) {
  .shell {
    padding: 18px 14px 36px;
  }

  .row > * {
    min-width: 100%;
  }
}