:root {
  --bg: #12141a;
  --panel: #1a1e28;
  --line: #2c3344;
  --text: #e8ecf4;
  --muted: #9aa3b5;
  --accent: #6ea8ff;
  --accent-2: #3d6fb8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font: 15px/1.45 "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, #243047 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1d2a22 0%, transparent 50%),
    var(--bg);
  padding: 28px 16px 48px;
}

.panel {
  width: min(920px, 100%);
  margin: 0 auto;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 22px 18px;
  backdrop-filter: blur(8px);
}

header h1 {
  margin: 0 0 4px;
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.meta {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

.controls {
  display: grid;
  gap: 12px;
  margin-bottom: 14px;
}

.field {
  display: grid;
  gap: 6px;
  max-width: 180px;
}

.field.wide { max-width: none; }

.field span, .check span {
  color: var(--muted);
  font-size: 0.86rem;
}

input[type="number"], input[type="text"], textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0f1218;
  color: var(--text);
  padding: 10px 12px;
  outline: none;
}

input:focus, textarea:focus {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--line));
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.check input { width: 16px; height: 16px; accent-color: var(--accent); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  color: #061018;
  font-weight: 650;
  cursor: pointer;
}

button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  font-weight: 550;
}

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

button:not(:disabled):hover { filter: brightness(1.06); }

.out textarea {
  min-height: 52vh;
  resize: vertical;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.4;
}