:root {
  --bg: #070b10;
  --panel: #0d141c;
  --panel2: #101922;
  --border: #1c2733;
  --green: #00ff9c;
  --amber: #ffb454;
  --text: #b9c7d2;
  --dim: #5a6b78;
  --mono: 'JetBrains Mono', monospace;
  --pixel: 'VT323', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: radial-gradient(ellipse at 30% 0%, #0e1a22 0%, #060a0e 70%);
  color: var(--text);
  font-family: var(--mono);
  min-height: 100vh;
}

/* CRT scanlines */
.scanlines {
  position: fixed; inset: 0; pointer-events: none; z-index: 999;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,0.15) 0px, rgba(0,0,0,0.15) 1px, transparent 2px, transparent 3px);
  mix-blend-mode: multiply;
  animation: flicker 6s infinite;
}
@keyframes flicker { 0%,95%,100%{opacity:.6} 96%{opacity:.4} 97%{opacity:.7} }

.app-shell { max-width: 1400px; margin: 0 auto; padding: 16px; position: relative; z-index: 1; }

/* HEADER */
.crt-header {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  background: linear-gradient(180deg, #12202a, #0a1119);
  border: 1px solid var(--border); border-radius: 12px 12px 4px 4px;
  padding: 14px 20px; margin-bottom: 14px;
  box-shadow: inset 0 0 30px rgba(0,255,156,0.05), 0 4px 20px rgba(0,0,0,0.5);
}
.hdr-left { display: flex; align-items: center; gap: 14px; }
.mascot { font-size: 42px; line-height: 1; filter: drop-shadow(0 0 8px rgba(0,255,156,0.3)); display: inline-block; }
.mascot.wiggle { animation: wiggle 0.4s ease-in-out 2; }
@keyframes wiggle { 0%,100%{transform:rotate(0)} 25%{transform:rotate(-14deg) scale(1.15)} 75%{transform:rotate(14deg) scale(1.15)} }

.title-glow {
  font-family: var(--pixel); font-size: 34px; letter-spacing: 3px; color: var(--green);
  text-shadow: 0 0 8px rgba(0,255,156,0.6), 0 0 20px rgba(0,255,156,0.25); line-height: 1;
}
.subtitle { font-size: 11px; color: var(--dim); letter-spacing: .5px; margin-top: 3px; }

.hdr-right { display: flex; align-items: center; gap: 10px; }
.power-led { width: 12px; height: 12px; border-radius: 50%; background: #331a1a; border: 1px solid #4a2a2a; }
.power-led.on { background: var(--green); box-shadow: 0 0 10px var(--green); animation: pulse 1s infinite; border-color: var(--green); }
@keyframes pulse { 50% { opacity: 0.4; } }
.power-lbl { font-family: var(--pixel); font-size: 18px; color: var(--dim); letter-spacing: 2px; min-width: 44px; }
.spec-btn {
  font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1px;
  background: transparent; color: var(--amber); border: 1px solid var(--amber); border-radius: 4px;
  padding: 6px 12px; cursor: pointer; transition: all .15s;
}
.spec-btn:hover { background: var(--amber); color: #0a0a0a; }
.spec-btn.small { font-size: 10px; padding: 4px 8px; }

/* MAIN GRID */
.main-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 14px; align-items: start; }
@media (max-width: 900px) { .main-grid { grid-template-columns: 1fr; } }

.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 8px;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.3);
}
.panel-bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #101922, #0c141b);
}
.panel-title { font-family: var(--pixel); font-size: 18px; letter-spacing: 2px; color: var(--green); }

/* base toggle */
.base-toggle { display: flex; gap: 4px; }
.base-btn { font-family: var(--mono); font-size: 10px; font-weight: 700; background: #0a1219; color: var(--dim); border: 1px solid var(--border); border-radius: 3px; padding: 3px 8px; cursor: pointer; }
.base-btn.active { color: var(--green); border-color: var(--green); box-shadow: 0 0 6px rgba(0,255,156,0.3); }

/* REGISTER BANK */
.bank-scroll { max-height: 640px; overflow-y: auto; padding: 12px; }
.reg-group { margin-bottom: 16px; }
.group-label { font-size: 10px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; padding: 4px 0 8px; border-bottom: 1px dashed; margin-bottom: 8px; }
.reg-grid { display: grid; gap: 6px; }
.grid-32 { grid-template-columns: repeat(4, 1fr); }
.grid-16 { grid-template-columns: repeat(4, 1fr); }
.grid-8 { grid-template-columns: repeat(4, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 600px) { .grid-32, .grid-16, .grid-8, .grid-4 { grid-template-columns: repeat(2, 1fr); } }

.reg-cell {
  background: var(--panel2); border: 1px solid; border-radius: 5px; padding: 5px 6px;
  cursor: pointer; transition: background .12s, transform .08s;
}
.reg-cell:hover { background: #16232f; }
.reg-changed { animation: regGlow 0.6s ease-out; }
@keyframes regGlow { 0% { background: rgba(0,255,156,0.25); box-shadow: 0 0 12px rgba(0,255,156,0.4);} 100% {} }
.reg-overflow { animation: overflowFlash 0.5s ease-out; }
@keyframes overflowFlash { 0%,50% { background: rgba(244,63,94,0.4); } 100% {} }
.reg-name { font-size: 10px; font-weight: 800; letter-spacing: .5px; }
.reg-val { font-size: 12px; color: var(--text); font-variant-numeric: tabular-nums; word-break: break-all; margin: 2px 0; }
.reg-input { width: 100%; background: #050a0e; border: 1px solid var(--green); color: var(--green); font-family: var(--mono); font-size: 12px; border-radius: 3px; padding: 1px 3px; }

.bit-strip { display: flex; gap: 2px; margin-top: 3px; }
.bit { width: 3px; height: 8px; border: 1px solid #2a3340; border-radius: 1px; flex: 0 0 auto; }
.bit-chunky { width: 10px; height: 12px; }

/* RIGHT COLUMN */
.right-col { display: flex; flex-direction: column; gap: 14px; }

/* STATUS */
.status-panel { padding: 12px; }
.stat-row { display: flex; gap: 10px; margin-bottom: 10px; }
.stat { flex: 1; background: var(--panel2); border: 1px solid var(--border); border-radius: 5px; padding: 6px 10px; display: flex; flex-direction: column; }
.stat-lbl { font-size: 9px; color: var(--dim); letter-spacing: 1px; }
.stat-val { font-family: var(--pixel); font-size: 24px; color: var(--amber); line-height: 1; }
.flag-row { display: flex; gap: 6px; flex-wrap: wrap; }
.flag-chip { display: flex; align-items: center; gap: 5px; font-size: 11px; font-weight: 700; border: 1px solid; border-radius: 4px; padding: 3px 8px; }
.flag-led { width: 8px; height: 8px; border-radius: 50%; }

/* EDITOR */
.editor-panel { display: flex; flex-direction: column; }
.ex-select { font-family: var(--mono); font-size: 11px; background: #0a1219; color: var(--amber); border: 1px solid var(--border); border-radius: 4px; padding: 3px 6px; cursor: pointer; }
.editor-wrap { padding: 10px; }
.code-area {
  width: 100%; height: 200px; resize: vertical; background: #050a0e; color: var(--green);
  font-family: var(--mono); font-size: 13px; line-height: 1.5; border: 1px solid var(--border);
  border-radius: 5px; padding: 10px; outline: none; caret-color: var(--green);
  box-shadow: inset 0 0 15px rgba(0,255,156,0.04);
}
.code-area:focus { border-color: var(--green); }

.controls { display: flex; gap: 8px; padding: 0 10px 12px; flex-wrap: wrap; align-items: center; }
.ctl-btn {
  font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .5px;
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 4px; padding: 7px 12px; cursor: pointer; transition: all .12s;
}
.ctl-btn:hover:not(:disabled) { border-color: var(--green); color: var(--green); }
.ctl-btn:disabled { opacity: .35; cursor: not-allowed; }
.ctl-btn.run { background: rgba(0,255,156,0.12); color: var(--green); border-color: var(--green); }
.ctl-btn.run:hover:not(:disabled) { background: var(--green); color: #060a0e; }
.speed-box { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.speed-lbl { font-size: 10px; color: var(--dim); min-width: 38px; }
.speed-box input[type=range] { accent-color: var(--green); width: 90px; }

.err-box { margin: 0 10px 12px; background: rgba(244,63,94,0.1); border: 1px solid rgba(244,63,94,0.4); border-radius: 5px; padding: 8px 10px; color: #ff8fa3; font-size: 11px; }

/* CONSOLE */
.console-panel { display: flex; flex-direction: column; }
.console-out { padding: 10px 12px; height: 180px; overflow-y: auto; font-size: 12px; line-height: 1.7; outline: none; }
.console-out.console-live { box-shadow: inset 0 0 0 1px rgba(0,255,156,0.35), inset 0 0 18px rgba(0,255,156,0.08); cursor: text; }
.console-out.console-live::after { content: '▊'; color: var(--green); animation: caretBlink 1s steps(1) infinite; }
@keyframes caretBlink { 50% { opacity: 0; } }

/* keyboard status chip */
.kbd-status { display: flex; align-items: center; gap: 6px; font-size: 10px; font-weight: 700; letter-spacing: .5px; color: var(--dim); margin-left: auto; margin-right: 8px; }
.kbd-status.live { color: var(--green); text-shadow: 0 0 6px rgba(0,255,156,0.4); }
.kbd-led { width: 8px; height: 8px; border-radius: 50%; background: #1a222c; border: 1px solid #2a3340; }
.kbd-status.live .kbd-led { background: var(--green); box-shadow: 0 0 8px var(--green); border-color: var(--green); animation: pulse 1s infinite; }
.console-line { color: var(--green); text-shadow: 0 0 4px rgba(0,255,156,0.3); word-break: break-all; white-space: pre-wrap; }
.console-empty { color: var(--dim); font-style: italic; }

/* OPCODE REF */
.op-ref { padding: 10px 12px; }
.op-search { width: 100%; background: #050a0e; border: 1px solid var(--border); color: var(--green); font-family: var(--mono); font-size: 12px; border-radius: 4px; padding: 6px 8px; margin-bottom: 8px; outline: none; }
.op-search:focus { border-color: var(--green); }
.op-list { max-height: 340px; overflow-y: auto; }
.op-item { display: grid; grid-template-columns: 44px 58px 34px 62px 1fr; gap: 6px; align-items: baseline; padding: 4px 5px; border-radius: 3px; cursor: pointer; font-size: 11px; }
.op-item:hover { background: #16232f; }
.op-hex { color: var(--amber); font-weight: 700; }
.op-mn { color: var(--green); font-weight: 700; }
.op-cyc { color: #f472b6; font-weight: 700; font-size: 10px; text-align: right; }
.op-args { color: var(--dim); font-style: italic; }
.op-desc { color: var(--text); font-size: 10px; }
@media (max-width: 500px) { .op-item { grid-template-columns: 40px 1fr 34px; } .op-args, .op-desc { display: none; } }

/* FLOPPY DRIVE */
.fdd-panel { display: flex; flex-direction: column; }
.fdd-body { display: flex; gap: 14px; align-items: center; padding: 12px; }
.fdd-disk {
  position: relative; width: 64px; height: 64px; flex: 0 0 auto;
  background: linear-gradient(135deg, #1a2a38, #0c1620);
  border: 2px solid #2a3a48; border-radius: 6px 6px 8px 8px;
  box-shadow: inset 0 0 12px rgba(0,0,0,0.6);
}
.fdd-disk.spinning .fdd-hub { animation: fddspin 1.4s linear infinite; }
@keyframes fddspin { to { transform: translate(-50%, -50%) rotate(360deg); } }
.fdd-hub {
  position: absolute; top: 58%; left: 50%; transform: translate(-50%, -50%);
  width: 26px; height: 26px; border-radius: 50%;
  background: radial-gradient(circle, #3a4a58 0%, #1a2530 70%);
  border: 1px solid #46586a;
}
.fdd-hub:before { content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 8px; height: 8px; background: #0a1219; border-radius: 2px; }
.fdd-shutter { position: absolute; top: 3px; left: 14px; width: 24px; height: 16px; background: #4a5a68; border-radius: 2px; box-shadow: inset 0 0 4px rgba(0,0,0,0.5); }
.fdd-disklabel { position: absolute; bottom: 4px; left: 0; right: 0; text-align: center; font-family: var(--pixel); font-size: 12px; color: var(--amber); letter-spacing: 1px; }
.fdd-info { flex: 1; display: flex; flex-direction: column; gap: 5px; }
.fdd-status { display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 700; letter-spacing: 1px; color: var(--text); }
.fdd-led { width: 8px; height: 8px; border-radius: 50%; background: #331a1a; border: 1px solid #4a2a2a; }
.fdd-led.on { background: var(--amber); box-shadow: 0 0 8px var(--amber); border-color: var(--amber); animation: pulse 1.2s infinite; }
.fdd-meta { font-size: 11px; color: var(--text); font-variant-numeric: tabular-nums; }
.fdd-meta.dim { color: var(--dim); }
.fdd-usebar { height: 6px; background: #0a1219; border: 1px solid var(--border); border-radius: 3px; overflow: hidden; }
.fdd-usefill { height: 100%; background: linear-gradient(90deg, var(--green), var(--amber)); transition: width .3s; }
.fdd-files { padding: 4px 12px 12px; max-height: 150px; overflow-y: auto; }
.fdd-file { display: flex; align-items: center; gap: 8px; padding: 4px 6px; border-radius: 4px; font-size: 12px; }
.fdd-file:hover { background: #16232f; }
.fdd-fico { font-size: 14px; }
.fdd-fname { color: var(--green); font-weight: 700; flex: 1; }
.fdd-fsize { color: var(--dim); font-size: 10px; }
.fdd-hex { padding: 4px 12px 12px; font-size: 11px; overflow-x: auto; }
.fdd-row { display: flex; gap: 8px; line-height: 1.5; }
.fdd-addr { color: var(--amber); font-weight: 700; }
.fdd-bytes { display: flex; gap: 3px; }
.fdd-byte { color: var(--text); font-variant-numeric: tabular-nums; }
.fdd-byte.fdd-head { background: var(--green); color: #060a0e; border-radius: 2px; padding: 0 1px; box-shadow: 0 0 6px var(--green); }

/* CHEESE BURST */
.cheese-burst {
  position: fixed; bottom: 60px; right: 40px; font-size: 60px; z-index: 500;
  animation: cheeseDrop 1.2s ease-out forwards; pointer-events: none;
}
@keyframes cheeseDrop { 0% { transform: translateY(-60px) rotate(0); opacity: 0; } 30% { opacity: 1; } 100% { transform: translateY(20px) rotate(360deg); opacity: 0; } }

/* FOOTER */
.foot { text-align: center; padding: 20px 0 12px; font-size: 11px; color: var(--dim); }
.foot a { color: var(--green); text-decoration: none; border-bottom: 1px dotted var(--green); }
.foot a:hover { text-shadow: 0 0 6px var(--green); }

/* MODAL */
.modal-back { position: fixed; inset: 0; background: rgba(0,0,0,0.8); z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 20px; backdrop-filter: blur(3px); }
.modal { position: relative; max-width: 520px; width: 100%; background: linear-gradient(180deg, #12202a, #0a1119); border: 1px solid var(--green); border-radius: 10px; padding: 28px; box-shadow: 0 0 40px rgba(0,255,156,0.15); }
.modal h2 { font-family: var(--pixel); font-size: 26px; margin-bottom: 14px; letter-spacing: 1px; }
.modal-close { position: absolute; top: 12px; right: 14px; background: none; border: none; color: var(--dim); font-size: 18px; cursor: pointer; }
.modal-close:hover { color: var(--green); }
.spec-p { font-size: 13px; line-height: 1.6; margin-bottom: 12px; }
.spec-p.dim { color: var(--dim); }
.spec-ul { list-style: none; margin: 0 0 14px; }
.spec-ul li { font-size: 13px; padding: 4px 0 4px 16px; position: relative; }
.spec-ul li:before { content: '›'; position: absolute; left: 0; color: var(--green); }

/* scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: #060a0e; }
::-webkit-scrollbar-thumb { background: #1c2733; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #2a3a48; }