:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --panel: #12161b;
  --panel-2: #171d22;
  --line: #2c343d;
  --text: #f1f4f2;
  --muted: #98a2a8;
  --cyan: #56d8ff;
  --green: #55d68b;
  --amber: #f0c75e;
  --red: #f36b78;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { box-sizing: border-box; margin: 0; }
body {
  background:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
    var(--bg);
  background-size: 32px 32px;
  color: var(--text);
  font: 13px/1.45 Inter, ui-sans-serif, system-ui, sans-serif;
}
.shell { max-width: 1600px; margin: 0 auto; padding: 16px; }

/* Header */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.topbar h1 { font-size: 18px; }
.eyebrow { color: var(--cyan); font-size: 10px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.topbar-right { display: flex; align-items: center; gap: 8px; }
.back-link { color: var(--cyan); text-decoration: none; font-size: 12px; border: 1px solid var(--line); border-radius: 6px; padding: 6px 10px; }
.back-link:hover { border-color: var(--cyan); }

/* Status indicator */
.status-badge { border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; min-width: 90px; text-align: center; }
.status-badge.paused { color: var(--amber); border-color: rgba(255,207,69,.5); }
.status-badge.running { color: var(--green); border-color: rgba(64,227,125,.5); }
.status-badge.idle { color: var(--muted); }
.status-badge.halted { color: var(--red); border-color: rgba(255,97,112,.5); }

/* Control bar */
.controls { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border: 1px solid var(--line); background: var(--panel); border-radius: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.controls .sep { width: 1px; height: 24px; background: var(--line); margin: 0 4px; }
.controls label { color: var(--muted); font-size: 11px; display: flex; align-items: center; gap: 6px; }
.controls input[type="file"] { font-size: 11px; color: var(--muted); max-width: 200px; }
.controls select { border: 1px solid var(--line); border-radius: 5px; background: var(--bg); color: var(--text); padding: 5px 8px; font: inherit; }

button { border: 1px solid var(--line); border-radius: 5px; color: var(--text); background: #0b1626; padding: 6px 12px; cursor: pointer; font-weight: 700; font-size: 12px; }
button:hover:not(:disabled) { border-color: var(--cyan); }
button:disabled { opacity: .4; cursor: default; }
button.primary { background: #063246; border-color: #0d82a2; color: #d9fbff; }
button.danger { border-color: rgba(255,97,112,.3); color: var(--red); }
.kbd { font-size: 9px; color: var(--muted); margin-left: 2px; }

/* Main layout */
.main { display: grid; grid-template-columns: 1fr 340px; gap: 12px; align-items: start; }
.panel { border: 1px solid var(--line); background: rgba(12,20,34,.86); border-radius: 8px; box-shadow: 0 12px 36px rgba(0,0,0,.2); }
.panel-hdr { color: var(--cyan); font-size: 10px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; padding: 10px 12px 6px; }

/* Left column */
.left-col { display: grid; gap: 12px; }

/* Framebuffer */
.canvas-wrap { padding: 0 12px 12px; display: grid; place-items: center; min-height: 280px; }
.canvas-wrap canvas { image-rendering: pixelated; max-width: 100%; height: auto; background: #000; border: 1px solid #17243a; border-radius: 4px; }

/* Memory inspector */
.mem-controls { display: flex; gap: 8px; align-items: center; padding: 0 12px 8px; }
.mem-controls input { border: 1px solid var(--line); border-radius: 5px; background: var(--bg); color: var(--text); padding: 5px 8px; font: 12px var(--mono); width: 100px; }
.mem-dump { padding: 0 12px 12px; font: 11px/1.6 var(--mono); color: var(--text); overflow-x: auto; white-space: pre; max-height: 260px; overflow-y: auto; }
.mem-addr { color: var(--cyan); }
.mem-ascii { color: var(--muted); }

/* Right column */
.right-col { display: grid; gap: 12px; }

/* Registers */
.reg-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 0 10px 10px; }
.reg-grid.wide { grid-template-columns: 1fr 1fr 1fr 1fr; }
.reg { border: 1px solid #18263d; background: #080f1c; border-radius: 4px; padding: 5px 7px; }
.reg span { display: block; color: var(--muted); font-size: 9px; text-transform: uppercase; letter-spacing: .06em; }
.reg strong { display: block; margin-top: 1px; font: 11px var(--mono); overflow: hidden; text-overflow: ellipsis; }
.reg.changed strong { color: var(--amber); }

/* SR flags */
.sr-flags { display: flex; gap: 4px; padding: 0 10px 8px; flex-wrap: wrap; }
.flag { border: 1px solid #18263d; background: #080f1c; border-radius: 4px; padding: 3px 7px; font: 700 10px var(--mono); color: var(--muted); }
.flag.set { color: var(--green); border-color: rgba(64,227,125,.4); background: rgba(64,227,125,.06); }

/* Breakpoints */
.bp-controls { display: flex; gap: 6px; padding: 0 10px 6px; }
.bp-controls input { border: 1px solid var(--line); border-radius: 5px; background: var(--bg); color: var(--text); padding: 4px 8px; font: 12px var(--mono); width: 100px; flex: 1; }
.bp-list { padding: 0 10px 10px; max-height: 150px; overflow-y: auto; }
.bp-item { display: flex; justify-content: space-between; align-items: center; padding: 4px 8px; border: 1px solid #18263d; background: #080f1c; border-radius: 4px; margin-bottom: 3px; font: 11px var(--mono); }
.bp-item .bp-remove { cursor: pointer; color: var(--red); font-size: 13px; background: none; border: none; padding: 0 4px; }
.bp-item.hit { border-color: rgba(255,207,69,.5); background: rgba(255,207,69,.06); }
.bp-empty { color: var(--muted); font-size: 11px; padding: 0 10px 10px; }

/* Status bar */
.status-bar { display: flex; gap: 16px; padding: 10px 14px; border: 1px solid var(--line); background: var(--panel); border-radius: 8px; margin-top: 12px; font: 11px var(--mono); color: var(--muted); flex-wrap: wrap; }
.status-bar .val { color: var(--text); }

/* Log */
.log-panel { margin-top: 12px; }
.log-panel pre { margin: 0; padding: 0 12px 10px; white-space: pre-wrap; color: #b9c5d8; font: 11px/1.5 var(--mono); max-height: 160px; overflow: auto; }

@media (max-width: 960px) {
  .main { grid-template-columns: 1fr; }
}
.step-count-input { width: 70px; border: 1px solid var(--line); border-radius: 5px; background: var(--bg); color: var(--text); padding: 5px 6px; font: 12px var(--mono); }
.inline-muted { font-size: 11px; color: var(--muted); }
.panel-hdr-tight { padding-top: 4px; }