:root {
  color-scheme: dark;
  --background: #0b1118;
  --surface: #141e28;
  --border: #30404a;
  --text: #e8f0ef;
  --muted: #9aadb5;
  --accent: #9be1c4;
  --mono: ui-monospace, SFMono-Regular, Consolas, monospace;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text); font-family: system-ui, sans-serif; }
button, textarea { font: inherit; }
.shell { max-width: 980px; margin: 0 auto; padding: 32px 20px 64px; }
.panel { margin-bottom: 16px; padding: 28px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); }
.panel[hidden] { display: none; }
h1, h2 { margin: 0; font-size: 24px; font-weight: 650; }
h3 { margin: 0 0 14px; font-size: 15px; font-weight: 600; }
form { margin-top: 22px; }
label { display: block; margin-bottom: 10px; font-size: 13px; font-weight: 600; }
textarea { display: block; width: 100%; min-height: 145px; padding: 14px; resize: vertical; border: 1px solid var(--border); border-radius: 6px; outline: none; background: #0d161e; color: var(--text); font: 13px/1.6 var(--mono); }
textarea:focus { border-color: var(--accent); }
textarea::placeholder { color: #7d919b; }
button { margin-top: 16px; padding: 11px 24px; border: 0; border-radius: 6px; background: var(--accent); color: #0c2119; font-size: 14px; font-weight: 700; cursor: pointer; }
button:hover { background: #b4ffdb; }
button:disabled { opacity: .6; cursor: wait; }
#message { min-height: 18px; margin: 10px 0 0; color: #ffb3a7; font-size: 12px; }
.statistics { margin-top: 24px; }
dl { display: grid; grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); gap: 10px; margin: 0; }
dl > div { padding: 14px; border: 1px solid var(--border); border-radius: 6px; background: #0e171f; }
dt { color: var(--muted); font-size: 11px; }
dd { margin: 9px 0 0; font: 18px var(--mono); overflow-wrap: anywhere; }
.matrices { display: grid; gap: 24px; margin-top: 30px; }
.matrix-view { overflow: auto; padding: 10px; border: 1px solid var(--border); border-radius: 6px; background: #0e171f; }
table { width: max-content; min-width: 100%; border-collapse: separate; border-spacing: 5px; font: 12px var(--mono); }
td { min-width: 65px; padding: 9px; border: 1px solid #315057; border-radius: 3px; background: #1b2c34; color: #c9ead9; text-align: right; }

@media (max-width: 600px) {
  .shell { padding: 14px 10px 36px; }
  .panel { padding: 20px 16px; }
  dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}