* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

:root {
    --gb-body: #C4C4B0;
    --gb-body-dark: #A0A090;
    --gb-bezel: #4A4A4A;
    --gb-screen-bg: #9BBC0F;
    --gb-green-dark: #0F380F;
    --gb-green-mid: #306230;
    --gb-green-light: #8BAC0F;
    --gb-green-lightest: #9BBC0F;
    --gb-btn-dark: #2D2D2D;
    --gb-btn-ab: #8B1A4A;
    --bg-color: #D4C5A9;
    --text-color: #333;
    --shadow-color: rgba(0,0,0,0.3);
}

body.dark-mode {
    --gb-body: #3A3A3A;
    --gb-body-dark: #2A2A2A;
    --gb-bezel: #1A1A1A;
    --bg-color: #1A1A1A;
    --text-color: #CCC;
    --shadow-color: rgba(0,0,0,0.6);
}

body {
    font-family: 'Press Start 2P', monospace;
    background: var(--bg-color);
    background-image:
        repeating-linear-gradient(90deg, transparent, transparent 20px, rgba(0,0,0,0.02) 20px, rgba(0,0,0,0.02) 21px),
        repeating-linear-gradient(0deg, transparent, transparent 20px, rgba(0,0,0,0.02) 20px, rgba(0,0,0,0.02) 21px);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px 10px;
    color: var(--text-color);
    transition: background 0.3s, color 0.3s;
}

#app-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: 100%;
    max-width: 420px;
}

#gameboy {
    background: var(--gb-body);
    border-radius: 20px 20px 20px 80px;
    padding: 16px 20px 30px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 8px 32px var(--shadow-color), inset 0 2px 0 rgba(255,255,255,0.3), inset 0 -2px 4px rgba(0,0,0,0.1);
    position: relative;
    transition: background 0.3s;
}

#cartridge-slot {
    background: #2A2A2A;
    height: 40px;
    margin: -16px -20px 12px;
    border-radius: 20px 20px 0 0;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#cartridge-ridges {
    position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: 120px; height: 100%;
    background: repeating-linear-gradient(90deg, transparent, transparent 4px, #1A1A1A 4px, #1A1A1A 6px);
}

#drop-zone {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    color: #888; font-size: 7px; letter-spacing: 1px;
    cursor: pointer; z-index: 2;
    border: 2px dashed transparent; transition: all 0.2s;
}

#drop-zone.drag-over {
    border-color: var(--gb-green-light);
    background: rgba(139,172,15,0.2);
    color: var(--gb-green-light);
}

#file-input { display: none; }

#load-btn {
    display: block; margin: 8px auto 4px; padding: 8px 14px;
    font-family: 'Press Start 2P', monospace; font-size: 6px;
    background: var(--gb-btn-dark); color: #CCC; border: none; border-radius: 6px;
    cursor: pointer; text-align: center; box-shadow: 0 3px 0 #111;
    transition: all 0.1s; position: relative; z-index: 3;
}
#load-btn:hover { background: #444; transform: translateY(1px); box-shadow: 0 2px 0 #111; }
#load-btn:active { transform: translateY(3px); box-shadow: 0 0 0 #111; }

#screen-section { margin-bottom: 16px; }

#top-label {
    text-align: center; font-size: 4.5px; color: #666;
    letter-spacing: 2px; margin-bottom: 4px; text-transform: uppercase;
}

#screen-bezel {
    background: var(--gb-bezel); border-radius: 12px; padding: 14px 18px;
    position: relative;
    box-shadow: inset 0 4px 12px rgba(0,0,0,0.6), 0 1px 0 rgba(255,255,255,0.1);
}

#led-indicator {
    width: 8px; height: 8px; background: #440000; border-radius: 50%;
    position: absolute; top: 6px; right: 14px;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.5); transition: all 0.3s;
}
#led-indicator.active {
    background: #FF2222;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3), 0 0 8px rgba(255,0,0,0.6), 0 0 20px rgba(255,0,0,0.2);
}

#canvas {
    display: block; width: 100%; max-width: 320px; aspect-ratio: 160 / 144;
    image-rendering: pixelated; image-rendering: -moz-crisp-edges; image-rendering: crisp-edges;
    background: var(--gb-screen-bg); border-radius: 4px;
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.3);
}

#screen-overlay { display: none; }

#berry-boy-label {
    text-align: center; font-size: 14px; color: #445;
    margin-top: 8px; font-style: italic; letter-spacing: 2px;
}
#berry-boy-label .tm { font-size: 6px; vertical-align: super; font-style: normal; }

#controls-section {
    display: flex; justify-content: space-between; align-items: center; padding: 10px 10px 0;
}

#dpad-area { flex-shrink: 0; }

#dpad {
    display: grid;
    grid-template-columns: 40px 40px 40px;
    grid-template-rows: 40px 40px 40px;
    gap: 0;
}

.dpad-btn {
    background: var(--gb-btn-dark); display: flex; align-items: center; justify-content: center;
    color: #555; font-size: 10px; cursor: pointer; transition: all 0.05s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.dpad-btn:active, .dpad-btn.pressed {
    background: #1A1A1A; box-shadow: inset 0 2px 4px rgba(0,0,0,0.5); transform: scale(0.95);
}

#dpad-up { border-radius: 6px 6px 0 0; grid-column: 2; grid-row: 1; }
#dpad-left { border-radius: 6px 0 0 6px; grid-column: 1; grid-row: 2; }
#dpad-center { background: var(--gb-btn-dark); grid-column: 2; grid-row: 2; }
#dpad-right { border-radius: 0 6px 6px 0; grid-column: 3; grid-row: 2; }
#dpad-down { border-radius: 0 0 6px 6px; grid-column: 2; grid-row: 3; }

#ab-area { display: flex; gap: 12px; transform: rotate(-25deg); flex-shrink: 0; }

.ab-btn {
    width: 52px; height: 52px; background: var(--gb-btn-ab); border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.5); font-size: 10px; cursor: pointer;
    box-shadow: 0 4px 0 #5A1030, 0 6px 8px rgba(0,0,0,0.3); transition: all 0.05s;
}
.ab-btn:active, .ab-btn.pressed {
    box-shadow: 0 1px 0 #5A1030, 0 2px 4px rgba(0,0,0,0.2); transform: translateY(3px);
}
#btn-b { margin-top: 14px; }

#meta-controls {
    display: flex; justify-content: center; gap: 24px; padding: 18px 0 4px;
    transform: rotate(-25deg);
}

.meta-btn {
    width: 52px; height: 14px; background: #777; border-radius: 7px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; box-shadow: inset 0 2px 4px rgba(0,0,0,0.4); transition: all 0.05s;
}
.meta-btn span { font-size: 4.5px; color: #444; letter-spacing: 1px; }
.meta-btn:active, .meta-btn.pressed { box-shadow: inset 0 3px 6px rgba(0,0,0,0.6); }

#speaker-grille {
    position: absolute; bottom: 28px; right: 20px;
    display: flex; flex-direction: column; gap: 4px; transform: rotate(-30deg);
}
.grille-line { width: 36px; height: 3px; background: rgba(0,0,0,0.15); border-radius: 2px; }

/* ======== MANDATORY CYCLE-ACCURATE DEBUG PANEL ======== */
#cycle-debug-panel {
    width: 100%; max-width: 380px;
    background: #0D1117;
    border: 2px solid #30363D;
    border-radius: 10px;
    padding: 12px;
    font-family: 'Press Start 2P', monospace;
}

body.dark-mode #cycle-debug-panel {
    background: #0A0E14;
    border-color: #1C2333;
}

#cycle-debug-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 6px;
}

#cycle-badge {
    background: #0E6B38;
    color: #3BF07A;
    font-size: 7px;
    padding: 5px 10px;
    border-radius: 6px;
    letter-spacing: 0.5px;
    box-shadow: 0 0 12px rgba(59, 240, 122, 0.2);
    animation: pulse-green 2s ease-in-out infinite;
}

@keyframes pulse-green {
    0%, 100% { box-shadow: 0 0 12px rgba(59, 240, 122, 0.2); }
    50% { box-shadow: 0 0 20px rgba(59, 240, 122, 0.4); }
}

#cycle-badge-dots {
    font-size: 6px;
    color: #8B949E;
    letter-spacing: 0.5px;
}

#cycle-debug-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.cdg-cell {
    background: #161B22;
    border: 1px solid #21262D;
    border-radius: 6px;
    padding: 8px;
}

body.dark-mode .cdg-cell {
    background: #111822;
    border-color: #1A2030;
}

.cdg-label {
    font-size: 4px;
    color: #6E7681;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.cdg-value {
    font-size: 8px;
    color: #E6EDF3;
    font-weight: bold;
}

.mode-oam { color: #F0C040; }
.mode-transfer { color: #F85149; }
.mode-hblank { color: #58A6FF; }
.mode-vblank { color: #8B949E; }

/* ======== EXTRA CONTROLS ======== */
#extra-controls {
    display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; align-items: center;
    max-width: 380px;
}

.retro-btn {
    font-family: 'Press Start 2P', monospace; font-size: 7px; padding: 8px 12px;
    background: #555; color: #EEE; border: none; border-radius: 4px;
    cursor: pointer; box-shadow: 0 3px 0 #333; transition: all 0.1s;
}
.retro-btn:hover { background: #666; }
.retro-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 #333; }

#speed-controls { display: flex; gap: 4px; }

.speed-btn {
    font-family: 'Press Start 2P', monospace; font-size: 6px; padding: 6px 8px;
    background: #444; color: #999; border: 2px solid transparent; border-radius: 4px;
    cursor: pointer; transition: all 0.1s;
}
.speed-btn.active {
    background: var(--gb-green-mid); color: var(--gb-green-lightest); border-color: var(--gb-green-light);
}

#sound-indicator { font-size: 6px; color: #888; padding: 4px; }

#palette-selector {
    display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; align-items: center;
    max-width: 380px; width: 100%;
}

.palette-label { font-size: 6px; color: #888; letter-spacing: 1px; margin-right: 2px; }

.palette-btn {
    font-family: 'Press Start 2P', monospace; font-size: 5px; padding: 5px 8px;
    background: #444; color: #AAA; border: 2px solid transparent; border-radius: 4px;
    cursor: pointer; display: flex; align-items: center; gap: 4px; transition: all 0.15s;
}
.palette-btn:hover { background: #555; color: #DDD; }
.palette-btn.active { background: var(--gb-green-mid); color: var(--gb-green-lightest); border-color: var(--gb-green-light); }

.palette-swatch {
    display: inline-block; width: 12px; height: 8px; border-radius: 2px;
    border: 1px solid rgba(255,255,255,0.2); flex-shrink: 0;
}

#debug-bar { width: 100%; max-width: 380px; text-align: center; }

#debug-info {
    font-size: 5.5px; color: #8BAC0F; background: rgba(15, 56, 15, 0.15);
    padding: 4px 10px; border-radius: 4px; display: inline-block;
    letter-spacing: 0.5px; border: 1px solid rgba(139, 172, 15, 0.2);
}
body.dark-mode #debug-info { background: rgba(139, 172, 15, 0.1); color: #9BBC0F; }

#keyboard-help {
    background: rgba(0,0,0,0.05); border: 1px dashed #999; border-radius: 8px;
    padding: 8px 14px; max-width: 380px; width: 100%; cursor: pointer;
}
#keyboard-toggle { font-size: 7px; color: #666; text-align: center; }
#keyboard-content { margin-top: 8px; overflow: hidden; max-height: 200px; transition: max-height 0.3s; }
#keyboard-help.collapsed #keyboard-content { max-height: 0; margin: 0; }

.key-row { font-size: 6px; color: #777; padding: 3px 0; display: flex; align-items: center; gap: 8px; }
.key {
    background: #DDD; padding: 3px 6px; border-radius: 3px; border: 1px solid #BBB;
    font-size: 5px; box-shadow: 0 2px 0 #BBB; color: #333;
}
body.dark-mode .key { background: #555; border-color: #444; box-shadow: 0 2px 0 #333; color: #DDD; }

#status-bar {
    display: flex; justify-content: space-between; width: 100%; max-width: 380px;
    font-size: 6px; color: #888; padding: 4px 0;
}
#rom-info { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#fps-counter { font-family: 'JetBrains Mono', monospace; flex-shrink: 0; }

#toast {
    position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: #222; color: #EEE; padding: 12px 20px; border-radius: 8px;
    font-size: 7px; max-width: 90vw; text-align: center; opacity: 0;
    transition: all 0.3s; z-index: 999; box-shadow: 0 4px 20px rgba(0,0,0,0.4); line-height: 1.6;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
#toast.hidden { display: none; }

footer {
    font-size: 6px; color: #888; text-align: center; line-height: 2; padding: 8px 0 20px;
}
footer a { color: var(--gb-green-mid); text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 440px) {
    #gameboy { border-radius: 14px 14px 14px 50px; padding: 12px 14px 24px; }
    .dpad-btn { width: 36px; height: 36px; }
    #dpad { grid-template-columns: 36px 36px 36px; grid-template-rows: 36px 36px 36px; }
    .ab-btn { width: 44px; height: 44px; }
    #cycle-debug-grid { grid-template-columns: 1fr 1fr; gap: 4px; }
    .cdg-cell { padding: 5px; }
    .cdg-value { font-size: 6px; }
}

@media (max-height: 700px) {
    body { padding: 8px; }
    #app-container { gap: 8px; }
}