/* ===========================================
   Chip-8 Emulator - Retro Game Console UI
   =========================================== */

/* CSS Variables - Theme Support */
:root {
    /* Default dark theme colors */
    --bg-color: #0a0a1a;
    --container-bg: #12122a;
    --text-color: #ffffff;
    --hint-color: #888888;
    --button-color: #00ff88;
    --button-text-color: #000000;
    --accent-color: #ff0088;
    --glow-color: rgba(0, 255, 136, 0.4);
    --border-radius: 16px;
    --transition-speed: 0.2s;

    /* Additional theme variables for better adaptation */
    --secondary-bg-color: #1a1a3e;
    --button-hover-bg: rgba(255, 255, 255, 0.15);
    --button-default-bg: rgba(255, 255, 255, 0.08);
    --border-color: rgba(255, 255, 255, 0.1);
    --screen-bg: #000000;
    --keypad-bg: rgba(0, 0, 0, 0.3);
    --keypad-btn-bg-start: #2a2a5a;
    --keypad-btn-bg-end: #1a1a3a;
    --keypad-btn-shadow: #0a0a1a;
}

/* Light theme adjustments (when Telegram is in day mode) */
[data-theme="light"] {
    --bg-color: #f5f5f5;
    --container-bg: #ffffff;
    --secondary-bg-color: #e8e8e8;
    --text-color: #000000;
    --hint-color: #666666;
    --button-color: #007aff;
    --button-text-color: #ffffff;
    --accent-color: #ff3b30;
    --glow-color: rgba(0, 122, 255, 0.3);
    --button-hover-bg: rgba(0, 0, 0, 0.08);
    --button-default-bg: rgba(0, 0, 0, 0.04);
    --border-color: rgba(0, 0, 0, 0.1);
    --screen-bg: #1a1a1a;
    --keypad-bg: rgba(0, 0, 0, 0.05);
    --keypad-btn-bg-start: #e0e0e0;
    --keypad-btn-bg-end: #d0d0d0;
    --keypad-btn-shadow: #b0b0b0;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 12px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Main Container - Game Console Frame */
#game-container {
    width: 100%;
    max-width: 420px;
    background: var(--container-bg);
    border-radius: var(--border-radius);
    padding: 16px;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.3),
        0 0 40px var(--glow-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* Header - Title & ROM Selector */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--button-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 20px var(--glow-color);
}

/* ROM Selector Dropdown */
.rom-selector {
    flex: 1;
    max-width: 160px;
    padding: 8px 12px;
    background: var(--button-default-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-speed);
}

.rom-selector:hover,
.rom-selector:focus {
    border-color: var(--button-color);
    box-shadow: 0 0 10px var(--glow-color);
}

.rom-selector option {
    background: var(--container-bg);
    color: var(--text-color);
}

/* Display Screen */
.screen-frame {
    background: var(--screen-bg);
    border-radius: 12px;
    padding: 8px;
    box-shadow:
        inset 0 0 20px rgba(0, 0, 0, 0.8),
        0 0 15px var(--glow-color);
}

#display {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 8px;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

/* ROM Info Display */
#rom-info {
    text-align: center;
    padding: 8px;
    font-size: 12px;
    color: var(--hint-color);
}

#rom-info strong {
    color: var(--text-color);
    display: block;
    margin-bottom: 4px;
}

.controls-hint {
    font-size: 11px;
    opacity: 0.7;
}

/* Control Buttons Row */
.control-bar {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.control-btn {
    flex: 1;
    max-width: 100px;
    padding: 12px 16px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    background: var(--button-default-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.control-btn:hover {
    background: var(--button-hover-bg);
    transform: translateY(-2px);
}

.control-btn:active {
    transform: translateY(0);
}

.control-btn.primary {
    background: var(--button-color);
    color: var(--button-text-color);
    box-shadow: 0 4px 15px var(--glow-color);
    border: none;
}

.control-btn.primary:hover {
    box-shadow: 0 6px 20px var(--glow-color);
}

.control-btn.primary.active {
    background: var(--accent-color);
    box-shadow: 0 4px 15px rgba(255, 0, 136, 0.4);
}

.control-btn.muted {
    opacity: 0.5;
}

/* Speed Control Slider */
.speed-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 16px;
    background: var(--keypad-bg);
    border-radius: 8px;
    font-size: 12px;
    color: var(--hint-color);
}

.speed-control label {
    font-weight: 600;
}

.speed-control input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 6px;
    background: var(--button-default-bg);
    border-radius: 3px;
    outline: none;
}

.speed-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--button-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px var(--glow-color);
}

.speed-control #speed-value {
    min-width: 20px;
    text-align: center;
    font-weight: 700;
    color: var(--button-color);
}

/* Virtual Keypad */
#controls {
    margin-top: 8px;
}

.keypad {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 12px;
    background: var(--keypad-bg);
    border-radius: 12px;
}

.keypad-row {
    display: flex;
    gap: 6px;
    justify-content: center;
}

.keypad-btn {
    width: 56px;
    height: 56px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(180deg, var(--keypad-btn-bg-start) 0%, var(--keypad-btn-bg-end) 100%);
    color: var(--text-color);
    font-size: 16px;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    cursor: pointer;
    transition: all 0.1s;
    box-shadow:
        0 4px 0 var(--keypad-btn-shadow),
        0 6px 10px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    user-select: none;
    -webkit-user-select: none;
}

.keypad-btn:hover {
    filter: brightness(1.2);
}

.keypad-btn:active,
.keypad-btn.active {
    transform: translateY(3px);
    box-shadow:
        0 1px 0 var(--keypad-btn-shadow),
        0 2px 5px rgba(0, 0, 0, 0.3);
    background: linear-gradient(180deg, var(--button-color) 0%, var(--button-color) 100%);
    color: var(--button-text-color);
}

/* Keyboard Hints (Desktop) */
.keyboard-hints {
    display: none;
    text-align: center;
    padding: 8px;
    font-size: 11px;
    color: var(--hint-color);
    background: var(--keypad-bg);
    border-radius: 8px;
    margin-top: 8px;
}

@media (min-width: 768px) {
    .keyboard-hints {
        display: block;
    }
}

/* Loading State */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--hint-color);
}

.loading::after {
    content: '';
    width: 24px;
    height: 24px;
    margin-left: 12px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--button-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Power LED Indicator */
.power-led {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #333;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
    transition: all 0.3s;
}

.power-led.on {
    background: var(--button-color);
    box-shadow: 0 0 10px var(--button-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

/* Responsive Adjustments */
@media (max-width: 380px) {
    #game-container {
        padding: 12px;
    }

    .keypad-btn {
        width: 48px;
        height: 48px;
        font-size: 14px;
    }

    .logo {
        font-size: 16px;
    }
}

@media (min-height: 800px) {
    .keypad-btn {
        width: 64px;
        height: 64px;
        font-size: 18px;
    }
}

/* CRT Screen Effect (Optional Enhancement) */
.screen-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        repeating-linear-gradient(0deg,
            rgba(0, 0, 0, 0.1) 0px,
            rgba(0, 0, 0, 0.1) 1px,
            transparent 1px,
            transparent 2px);
    pointer-events: none;
    border-radius: 8px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}