:root {
  --case:      #d7c9a7;
  --case-dark: #b8a882;
  --screen-blue:#4a3aa0;
  --panel:     #1a1726;
  --panel-2:   #24202f;
  --ink:       #ece6d3;
  --accent:    #6c9dff;
  --ok:        #7bd88f;
  --warn:      #f0c96a;
  --err:       #e07070;
  --mono: 'IBM Plex Mono', monospace;
  --display: 'Bricolage Grotesque', sans-serif;
}

* { box-sizing: border-box; }
html,body { margin:0; padding:0; }
body {
  background:
    radial-gradient(circle at 20% 0%, #2b2740 0%, transparent 55%),
    radial-gradient(circle at 85% 100%, #241d34 0%, transparent 50%),
    #14121d;
  color: var(--ink);
  font-family: var(--mono);
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
}

#app { max-width: 960px; margin: 0 auto; padding: 0 16px 40px; }

/* ---- Header ---- */
#topbar { padding-top: 18px; }
.stripe {
  height: 10px; border-radius: 6px;
  background: linear-gradient(90deg,
    #ffffff 0 14%, #f0c96a 14% 28%, #d98b3f 28% 42%,
    #cc4b4b 42% 56%, #a04ba0 56% 70%, #4a5ec9 70% 84%, #4dae90 84% 100%);
  margin-bottom: 14px;
  box-shadow: 0 2px 10px rgba(0,0,0,.4);
}
.title-row h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.7rem, 5vw, 3rem);
  letter-spacing: -0.02em;
  margin: 0;
  background: linear-gradient(180deg, #fff, #b9c8ff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.title-row h1 .berry { -webkit-text-fill-color: initial; }
.subtitle {
  margin: 4px 0 0; font-size: .8rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--accent); opacity: .85;
}

/* ---- Upload panel ---- */
#upload-panel {
  margin-top: 24px;
  background: var(--panel);
  border: 1px solid #322c44;
  border-radius: 14px;
  padding: 24px;
  animation: fadeUp .5s ease both;
}
#upload-panel h2 {
  font-family: var(--display); margin: 0 0 6px; font-size: 1.4rem;
}
.hint { font-size: .82rem; line-height: 1.5; color: #b3aec5; margin: 0 0 18px; max-width: 60ch; }

.rom-grid {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.rom-slot {
  position: relative;
  display: flex; flex-direction: column; gap: 4px;
  background: var(--panel-2);
  border: 2px dashed #3d3552;
  border-radius: 10px;
  padding: 16px;
  cursor: pointer;
  transition: border-color .2s, transform .15s, background .2s;
}
.rom-slot:hover { border-color: var(--accent); transform: translateY(-2px); }
.rom-slot.drag { border-color: var(--ok); background: #2a3324; }
.rom-slot.loaded { border-style: solid; border-color: var(--ok); background: #202b1f; }
.rom-slot input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.chip-name { font-weight: 600; font-size: .9rem; color: var(--ink); }
.chip-addr { font-size: .72rem; color: #8f89a5; }
.chip-status { font-size: .78rem; margin-top: 6px; color: var(--err); }
.chip-status.ok { color: var(--ok); }
.chip-status.warn { color: var(--warn); }

.upload-actions {
  margin-top: 20px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
}
#upload-msg { font-size: .78rem; color: var(--accent); }

/* ---- Buttons ---- */
button {
  font-family: var(--mono); font-size: .85rem;
  background: var(--accent); color: #0e1330;
  border: none; border-radius: 8px; padding: 10px 16px;
  cursor: pointer; font-weight: 600;
  transition: transform .12s, filter .15s, box-shadow .15s;
}
button:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled { opacity: .4; cursor: not-allowed; }
button.ghost {
  background: transparent; color: var(--accent);
  border: 1px solid #3d3552;
}
#boot-btn { background: var(--ok); font-size: 1rem; padding: 12px 28px; }

/* ---- Machine ---- */
#machine { margin-top: 24px; animation: fadeUp .4s ease both; }

.monitor {
  background: linear-gradient(180deg, var(--case) 0%, var(--case-dark) 100%);
  border-radius: 18px;
  padding: 20px 20px 14px;
  box-shadow: 0 14px 40px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.4);
}
.bezel {
  background: #0c0a16;
  border-radius: 10px;
  padding: 16px;
  box-shadow: inset 0 0 30px rgba(0,0,0,.9);
}
#screen {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 403 / 284;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  border-radius: 3px;
  background: var(--screen-blue);
}
.brand {
  text-align: right; margin-top: 10px;
  font-family: var(--display); font-weight: 800;
  color: #5b5038; letter-spacing: .05em; font-size: .8rem;
}

/* ---- Controls ---- */
#controls {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  margin-top: 16px; padding: 14px;
  background: var(--panel); border: 1px solid #322c44; border-radius: 12px;
}
#controls label.sel, #controls label.vol {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .78rem; color: #b3aec5;
}
#controls select {
  background: var(--panel-2); color: var(--ink);
  border: 1px solid #3d3552; border-radius: 6px; padding: 6px; font-family: var(--mono);
}
#controls input[type=range] { width: 90px; accent-color: var(--accent); }
.ghost-btn {
  position: relative; overflow: hidden;
  background: transparent; color: var(--accent);
  border: 1px solid #3d3552; border-radius: 8px; padding: 10px 16px;
  font-size: .85rem; cursor: pointer; font-weight: 600;
}
.ghost-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
#speed { margin-left: auto; font-size: .78rem; color: var(--ok); }

/* ---- Debugger ---- */
#debugger {
  margin-top: 14px; display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  background: #0e0c17; border: 1px solid #322c44; border-radius: 12px; padding: 16px;
}
.dbg-col h3 {
  margin: 0 0 6px; font-size: .72rem; text-transform: uppercase;
  letter-spacing: .12em; color: var(--accent);
}
.dbg-col pre {
  margin: 0 0 10px; font-size: .72rem; line-height: 1.4;
  color: #b9e08f; white-space: pre; overflow-x: auto;
}
#mem-addr {
  background: var(--panel-2); color: var(--ink); border: 1px solid #3d3552;
  border-radius: 6px; padding: 5px 8px; font-family: var(--mono);
  width: 90px; margin-bottom: 8px; text-transform: uppercase;
}

/* ---- Memory Corruptor ---- */
#corruptor {
  margin-top: 14px; padding: 12px 14px;
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
  background: linear-gradient(90deg, #2a0e12, #1a1726);
  border: 1px solid #6a2530; border-radius: 10px;
}
.corrupt-title {
  font-weight: 700; letter-spacing: .1em; font-size: .8rem;
  color: #ff6b6b; text-shadow: 0 0 8px rgba(255,80,80,.5);
}
.corrupt-amt {
  display: flex; flex-direction: column; gap: 3px;
  font-size: .68rem; color: #b3aec5; text-transform: uppercase; letter-spacing: .08em;
}
#corrupt-amount {
  background: var(--panel-2); color: #ffb0b0; border: 1px solid #6a2530;
  border-radius: 6px; padding: 6px 8px; font-family: var(--mono);
  font-size: .85rem; width: 150px;
}
.corrupt-inf { font-size: .72rem; color: #ff9a9a; display: flex; align-items: center; gap: 5px; cursor: pointer; }
button.danger {
  background: #d0343f; color: #fff;
  box-shadow: 0 0 14px rgba(208,52,63,.4);
}
button.danger:hover:not(:disabled) { filter: brightness(1.15); }
button.danger.raging { animation: corruptShake .3s infinite; }
#corrupt-msg { font-size: .74rem; color: #ff9a9a; }
@keyframes corruptShake {
  0%,100% { transform: translate(0,0); }
  25% { transform: translate(-2px,1px); }
  50% { transform: translate(2px,-1px); }
  75% { transform: translate(-1px,-2px); }
}

/* ---- On-screen keyboard ---- */
#osk { margin-top: 16px; }
.osk-hint { font-size: .72rem; color: #8f89a5; margin-bottom: 8px; }
.osk-hint b { color: var(--accent); }
#osk-keys { display: flex; flex-direction: column; gap: 5px; }
.osk-row { display: flex; gap: 5px; justify-content: center; }
.osk-key {
  flex: 1; min-width: 0; max-width: 60px;
  background: var(--panel-2); color: var(--ink);
  border: 1px solid #3d3552; border-radius: 6px;
  padding: 10px 2px; font-size: .72rem; font-weight: 600;
  transition: none;
}
.osk-key.down { background: var(--accent); color: #0e1330; transform: translateY(1px); }
.osk-key.space { max-width: none; flex: 4; }

/* ---- Footer ---- */
footer {
  margin-top: 28px; padding-top: 16px;
  border-top: 1px solid #2a2438;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  font-size: .72rem; color: #7a7490;
}
footer a { color: var(--accent); text-decoration: none; font-weight: 600; }
footer a:hover { text-decoration: underline; }

/* ---- SingleStepTests harness ---- */
#sst-panel {
  margin-top: 18px; padding: 16px;
  background: #0e0c17; border: 1px solid #322c44; border-radius: 12px;
  animation: fadeUp .3s ease both;
}
#sst-panel h3 {
  margin: 0 0 6px; font-family: var(--display); font-size: 1.05rem; color: var(--ink);
}
#sst-panel .hint a { color: var(--accent); }
#sst-panel code {
  background: var(--panel-2); padding: 1px 5px; border-radius: 4px; font-size: .78em;
}
.sst-controls {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin: 12px 0;
}
.sst-controls label {
  display: flex; flex-direction: column; gap: 4px;
  font-size: .72rem; color: #8f89a5; text-transform: uppercase; letter-spacing: .08em;
}
.sst-controls input {
  background: var(--panel-2); color: var(--ink); border: 1px solid #3d3552;
  border-radius: 6px; padding: 7px 9px; font-family: var(--mono); font-size: .85rem;
}
.sst-controls input#sst-range { width: 190px; }
.sst-controls input#sst-limit { width: 110px; }
.sst-summary {
  font-size: .82rem; color: var(--accent); font-weight: 600;
  padding: 8px 0; border-top: 1px dashed #2a2438; margin-top: 4px;
}
.sst-log {
  max-height: 320px; overflow-y: auto; margin-top: 8px;
  font-size: .74rem; line-height: 1.5;
}
.sst-row { padding: 3px 6px; border-radius: 4px; }
.sst-row.ok  { color: var(--ok); }
.sst-row.err { color: var(--err); background: rgba(224,112,112,.08); }
.sst-row b { color: var(--ink); }
.sst-detail { color: #b3aec5; font-size: .96em; padding-left: 18px; opacity: .85; }

.hidden { display: none !important; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  .osk-key { padding: 12px 1px; font-size: .68rem; }
  #controls { gap: 8px; }
  #speed { margin-left: 0; }
}