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

:root {
  --bg-deep: #0a0a1a;
  --bg-dark: #12122a;
  --bg-panel: #1a1a3e;
  --bg-surface: #222255;
  --sega-blue: #0060A8;
  --sega-blue-light: #0080e0;
  --sega-red: #cc2222;
  --accent: #00c8ff;
  --text: #e0e8ff;
  --text-dim: #8090b0;
  --text-bright: #ffffff;
  --border: #2a2a5a;
  --btn-bg: #1e1e4a;
  --btn-hover: #2a2a6a;
  --btn-active: #0060A8;
  --pixel-font: 'Press Start 2P', monospace;
  --mono-font: 'JetBrains Mono', 'Fira Code', monospace;
}

html, body {
  background: var(--bg-deep);
  color: var(--text);
  font-family: var(--mono-font);
  font-size: 14px;
  min-height: 100vh;
  overflow-x: hidden;
}

body {
  background: 
    radial-gradient(ellipse at 50% 0%, rgba(0,96,168,0.15) 0%, transparent 60%),
    linear-gradient(180deg, var(--bg-deep) 0%, #080818 100%);
}

#header {
  background: linear-gradient(180deg, #0e0e28 0%, var(--bg-dark) 100%);
  border-bottom: 2px solid var(--sega-blue);
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  font-family: var(--pixel-font);
  font-size: 20px;
  color: var(--text-bright);
  letter-spacing: 2px;
}

.logo-dot {
  color: var(--sega-blue-light);
}

.subtitle {
  font-family: var(--pixel-font);
  font-size: 8px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

.header-btn {
  font-family: var(--pixel-font);
  font-size: 9px;
  background: var(--btn-bg);
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 6px 14px;
  cursor: pointer;
  border-radius: 4px;
  margin-left: auto;
  transition: all 0.2s;
}

.header-btn:hover {
  background: var(--btn-hover);
  border-color: var(--accent);
}

.header-btn + .header-btn {
  margin-left: 8px;
}

#main {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  gap: 20px;
  padding: 20px;
  align-items: flex-start;
}

#emulator-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
}

#crt-bezel {
  background: linear-gradient(145deg, #1a1a2e 0%, #0d0d1e 100%);
  border: 3px solid #2a2a4a;
  border-radius: 18px;
  padding: 18px 22px 22px;
  box-shadow:
    0 0 40px rgba(0,96,168,0.15),
    inset 0 0 30px rgba(0,0,0,0.5),
    0 8px 32px rgba(0,0,0,0.6);
  position: relative;
}

#crt-bezel::before {
  content: '';
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.04);
  pointer-events: none;
}

#crt-screen {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
}

#canvas {
  display: block;
  width: 512px;
  height: 384px;
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
}

#scanline-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 2px,
    rgba(0,0,0,0.12) 2px,
    rgba(0,0,0,0.12) 4px
  );
  mix-blend-mode: multiply;
}

#controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 560px;
}

.ctrl-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.ctrl-btn {
  font-family: var(--pixel-font);
  font-size: 9px;
  background: linear-gradient(180deg, var(--btn-bg) 0%, #16163a 100%);
  color: var(--text);
  border: 2px solid var(--border);
  padding: 8px 14px;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.15s;
  white-space: nowrap;
  box-shadow: 0 3px 0 #0a0a20, 0 4px 8px rgba(0,0,0,0.3);
  position: relative;
  top: 0;
}

.ctrl-btn:hover {
  background: linear-gradient(180deg, var(--btn-hover) 0%, #1e1e4a 100%);
  border-color: var(--sega-blue);
  color: var(--text-bright);
}

.ctrl-btn:active {
  top: 2px;
  box-shadow: 0 1px 0 #0a0a20;
}

.ctrl-btn.primary {
  background: linear-gradient(180deg, var(--sega-blue) 0%, #004080 100%);
  border-color: var(--sega-blue-light);
  color: var(--text-bright);
  font-size: 10px;
  padding: 10px 18px;
}

.ctrl-btn.primary:hover {
  background: linear-gradient(180deg, var(--sega-blue-light) 0%, var(--sega-blue) 100%);
}

.ctrl-select {
  font-family: var(--mono-font);
  font-size: 12px;
  background: var(--btn-bg);
  color: var(--text);
  border: 2px solid var(--border);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.rom-info {
  font-size: 10px;
  color: var(--text-dim);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-icon {
  font-style: normal;
}

/* Gamepad */
#gamepad {
  display: none;
  margin-top: 20px;
  width: 100%;
  max-width: 560px;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
}

#dpad {
  display: grid;
  grid-template-columns: 44px 44px 44px;
  grid-template-rows: 44px 44px 44px;
  gap: 2px;
}

.dpad-btn {
  background: var(--btn-bg);
  border: 2px solid var(--border);
  color: var(--text);
  font-size: 16px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.dpad-center {
  background: var(--bg-dark);
  border-color: var(--bg-dark);
  cursor: default;
}

.dpad-btn:active:not(.dpad-center) {
  background: var(--sega-blue);
  border-color: var(--sega-blue-light);
}

.gp-btn {
  font-family: var(--pixel-font);
  font-size: 10px;
  background: var(--btn-bg);
  border: 2px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 50%;
  cursor: pointer;
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.gp-btn:active {
  background: var(--sega-blue);
}

.gp-pause {
  border-radius: 20px;
  width: auto;
  font-size: 8px;
}

.action-btn[data-btn="1"] {
  background: linear-gradient(180deg, #3a1a1a, #2a0a0a);
  border-color: #882222;
}
.action-btn[data-btn="2"] {
  background: linear-gradient(180deg, #1a2a3a, #0a1a2a);
  border-color: #226688;
}

#action-btns {
  display: flex;
  gap: 12px;
}

/* Debug Panel */
#debug-panel {
  width: 340px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  position: sticky;
  top: 80px;
  transition: all 0.3s;
}

#debug-panel.hidden {
  display: none;
}

.debug-title {
  font-family: var(--pixel-font);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.debug-section {
  margin-bottom: 14px;
}

.debug-section h3 {
  font-family: var(--pixel-font);
  font-size: 8px;
  color: var(--sega-blue-light);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.debug-section pre {
  font-family: var(--mono-font);
  font-size: 11px;
  color: var(--text);
  background: var(--bg-deep);
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 180px;
  overflow-y: auto;
}

.disasm-log {
  font-size: 10px !important;
  max-height: 200px !important;
}

.palette-view {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  padding: 6px;
  background: var(--bg-deep);
  border-radius: 6px;
  border: 1px solid var(--border);
}

.pal-swatch {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  border: 1px solid rgba(255,255,255,0.1);
}

#vram-canvas {
  width: 256px;
  height: 256px;
  image-rendering: pixelated;
  background: #000;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* Modal */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal.hidden { display: none; }

.modal-content {
  background: var(--bg-panel);
  border: 2px solid var(--sega-blue);
  border-radius: 12px;
  padding: 24px;
  max-width: 400px;
  width: 90%;
}

.modal-content h2 {
  font-family: var(--pixel-font);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 16px;
}

.keys-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

.keys-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}

.keys-table td:first-child {
  color: var(--accent);
  font-weight: bold;
  width: 40%;
}

/* Footer */
#footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid var(--border);
  margin-top: 40px;
  font-size: 11px;
  color: var(--text-dim);
}

#footer a {
  color: var(--sega-blue-light);
  text-decoration: none;
}

#footer a:hover {
  text-decoration: underline;
}

.disclaimer {
  font-size: 9px;
  margin: 6px 0;
  color: var(--text-dim);
  opacity: 0.7;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* Responsive */
@media (max-width: 900px) {
  #main {
    flex-direction: column;
    align-items: center;
  }
  #debug-panel {
    width: 100%;
    max-width: 560px;
    position: static;
    max-height: 400px;
  }
  #canvas {
    width: 100%;
    max-width: 512px;
    height: auto;
    aspect-ratio: 256/192;
  }
  #gamepad { display: flex; }
}

@media (max-width: 560px) {
  .logo { font-size: 14px; }
  .subtitle { display: none; }
  #crt-bezel { padding: 10px 12px 14px; border-radius: 12px; }
  .ctrl-btn { padding: 6px 10px; font-size: 8px; }
  .ctrl-btn.primary { padding: 8px 14px; font-size: 9px; }
  #gamepad { display: flex; }
}

@media (hover: none) and (pointer: coarse) {
  #gamepad { display: flex; }
}

/* Splash animation */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.splash-pulse {
  animation: pulse 1.5s ease-in-out infinite;
}