:root {
  --bg: #0d0f12;
  --bg2: #171a1f;
  --panel: #101318;
  --panel2: #171b22;
  --ink: #f1f3f7;
  --muted: #a0a8b5;
  --line: #2a303a;
  --field: #11151b;
  --field-line: #353d4a;
  --btn: #1e242f;
  --btn-line: #414a5a;
  --pink: #ff0a8a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 25% -5%, #262c36 0%, var(--bg) 45%);
}

.app-shell {
  height: 100%;
  display: grid;
  grid-template-columns: minmax(340px, 420px) 1fr;
}

.panel {
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel2) 100%);
  padding: 18px;
  overflow: auto;
}

.brand {
  margin-bottom: 14px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #000000;
}

.brand-logo {
  display: block;
  width: 100%;
  max-height: 72px;
  object-fit: contain;
  margin-bottom: 0;
}

h1 {
  margin: 0;
  font-size: 1.16rem;
}

.sub {
  color: var(--muted);
  margin: 6px 0 14px;
  font-size: 0.9rem;
}

.controls {
  display: grid;
  gap: 10px;
}

.control-group {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0e1218;
  overflow: hidden;
}

.control-group > summary {
  list-style: none;
  cursor: pointer;
  padding: 10px 12px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #d7dce5;
  border-bottom: 1px solid transparent;
}

.control-group[open] > summary {
  border-bottom-color: var(--line);
}

.control-group > summary::-webkit-details-marker {
  display: none;
}

.group-body {
  display: grid;
  gap: 10px;
  padding: 10px;
}

.control {
  display: grid;
  gap: 4px;
}

.control label {
  font-size: 0.84rem;
  color: var(--muted);
}

.control input,
.control select {
  width: 100%;
  padding: 8px 9px;
  border-radius: 8px;
  border: 1px solid var(--field-line);
  background: var(--field);
  color: var(--ink);
}

.buttons {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

button {
  border: 1px solid var(--btn-line);
  background: var(--btn);
  color: var(--ink);
  border-radius: 10px;
  padding: 9px 10px;
  cursor: pointer;
  font-weight: 600;
}

button#downloadBtn {
  background: linear-gradient(180deg, #ff0a8a 0%, #cb006b 100%);
  border-color: #8e004a;
}

.stats {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.4;
}

.viewer-wrap {
  position: relative;
  min-width: 0;
}

#viewer {
  width: 100%;
  height: 100%;
  display: block;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: 50vh;
  }
}