:root {
  --bg: #0f1115;
  --panel: #181b22;
  --panel-2: #20242d;
  --text: #f2f4f8;
  --muted: #a7adbb;
  --border: #313744;
  --accent: #f97316;
  --accent-2: #ea580c;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page.center {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0,0,0,.28);
}

.narrow {
  width: min(520px, 100%);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.card-header.compact {
  padding-bottom: 16px;
  margin-bottom: 18px;
}

.brand-logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
  flex: 0 0 auto;
}

.brand-title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--text);
}

.brand-subtitle {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

h1 {
  font-size: 28px;
  margin: 0 0 12px;
}

p {
  color: var(--muted);
  line-height: 1.5;
}

.small {
  font-size: 13px;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.actions.vertical {
  flex-direction: column;
}

.button {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #111;
}

.button.primary:hover {
  background: var(--accent-2);
  border-color: var(--accent-2);
}

.button.danger {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
}

.button:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.operator-layout {
  height: 100%;
  display: grid;
  grid-template-columns: 340px 1fr;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 22px;
  overflow: auto;
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 14px 0 6px;
}

input,
select {
  width: 100%;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0d0f14;
  color: var(--text);
  padding: 0 12px;
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--accent);
}

select {
  appearance: auto;
}

.status-box {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #11141b;
}

.status-box strong {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.status-box span {
  display: block;
  word-break: break-word;
}

.viewer-wrap {
  position: relative;
  overflow: hidden;
  background: #050608;
  display: grid;
  place-items: center;
}

#viewer {
  max-width: 100%;
  max-height: 100%;
  outline: none;
  background: #050608;
}

.empty-state {
  position: absolute;
  inset: auto;
  color: var(--muted);
  background: rgba(24, 27, 34, .88);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
}

@media (max-width: 900px) {
  .operator-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}