.collatz-page {
  min-height: 100svh;
  background:
    radial-gradient(circle at 15% 8%, rgba(111, 182, 154, 0.24), transparent 28%),
    linear-gradient(140deg, #070908 0%, #111715 48%, #19140f 100%);
}

.collatz-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.collatz-app {
  padding-top: clamp(24px, 5vw, 56px);
}

.collatz-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.collatz-head h1 {
  margin: 0;
  font-size: clamp(44px, 8vw, 92px);
  line-height: 0.92;
}

.collatz-status {
  min-width: 108px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px 12px;
  color: var(--accent-strong);
  background: rgba(16, 21, 20, 0.78);
  text-align: center;
  font-weight: 760;
}

.collatz-grid {
  display: grid;
  grid-template-columns: minmax(260px, 360px) 1fr;
  gap: 14px;
}

.collatz-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(16, 21, 20, 0.78);
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.28);
}

.controls-panel {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.controls-panel label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 760;
}

.controls-panel input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0 12px;
  color: var(--ink);
  background: rgba(248, 244, 234, 0.08);
  font: inherit;
}

.collatz-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.collatz-actions button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: rgba(248, 244, 234, 0.1);
  font: inherit;
  font-weight: 760;
  cursor: pointer;
}

.collatz-actions button:first-child {
  background: var(--accent-strong);
  color: #10100e;
}

.collatz-actions button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.worker-downloads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.worker-downloads a {
  display: grid;
  min-height: 42px;
  align-items: center;
  justify-items: center;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--ink);
  background: rgba(248, 244, 234, 0.1);
  font-weight: 760;
  text-decoration: none;
}

.admin-import {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.admin-import summary {
  color: var(--accent-strong);
  cursor: pointer;
  font-weight: 760;
}

.admin-import button {
  width: 100%;
  min-height: 42px;
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: #10100e;
  background: var(--green);
  font: inherit;
  font-weight: 760;
  cursor: pointer;
}

.admin-import input {
  padding: 10px 0;
  background: transparent;
}

.admin-import p {
  min-height: 18px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.stats-panel {
  padding: 16px;
}

.stats-panel dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.stats-panel div {
  min-width: 0;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.stats-panel dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  text-transform: uppercase;
}

.stats-panel dd {
  margin: 4px 0 0;
  overflow-wrap: anywhere;
  font-size: clamp(20px, 4vw, 36px);
  font-weight: 800;
}

.output-panel {
  margin-top: 14px;
  min-height: 360px;
  max-height: 52svh;
  overflow: auto;
}

.output-panel pre {
  margin: 0;
  padding: 16px;
  color: #daf7e8;
  font: 14px/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
}

@media (max-width: 760px) {
  .collatz-head {
    align-items: stretch;
    flex-direction: column;
  }

  .collatz-grid,
  .stats-panel dl {
    grid-template-columns: 1fr;
  }
}