body {
    background-color: #111;
    color: #eee;
    font-family: 'Courier New', Courier, monospace;
    height: 100vh;
    margin: 0;
    box-sizing: border-box;
    overflow: hidden;
    /* Fix scroll */
}

#app-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    gap: 40px;
    padding: 20px;
}

#left-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#title-display {
    font-size: 24px;
    line-height: 22px;
    color: #eee;
    white-space: pre;
    font-family:
        "MS Gothic",
        "Noto Sans Mono CJK JP",
        "Osaka-Mono",
        "Courier New",
        monospace;
    text-align: center;
    border: 2px solid #555;
    padding: 20px;
    background-color: #000;
}

#title-display.title-cold {
    color: #0ff;
    text-shadow: 0 0 6px rgba(0, 255, 255, 0.35);
}

#title-display.title-bomb {
    color: #f44;
    text-shadow: 0 0 6px rgba(255, 80, 80, 0.35);
}

#game-container {
    display: flex;
    gap: 20px;
    padding: 20px;
    border: 2px solid #555;
    background-color: #000;
}

#game-display {
    font-size: 24px;
    line-height: 24px;
    margin: 0;
    white-space: pre;
}

#info-panel {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 140px;
}

#next-display,
#hold-display {
    font-size: 16px;
    line-height: 16px;
    margin: 0;
    white-space: pre;
    border: 1px solid #333;
    padding: 5px;
    min-height: 40px;
}

/* Instructions Panel */
#instructions-panel {
    width: 300px;
    height: 80vh;
    /* Fixed height for scrolling if needed */
    overflow-y: auto;
    border: 1px solid #444;
    padding: 20px;
    background-color: #0a0a0a;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    font-size: 14px;
    line-height: 1.5;
}

#instructions-panel h3 {
    border-bottom: 1px solid #444;
    padding-bottom: 5px;
    margin-top: 0;
    margin-bottom: 15px;
    color: #0ff;
}

#instructions-panel h3:not(:first-child) {
    margin-top: 20px;
}

.inst-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.inst-list li {
    margin-bottom: 8px;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.key {
    display: inline-block;
    border: 1px solid #666;
    border-radius: 3px;
    padding: 0 6px;
    margin: 0 2px;
    background-color: #222;
    color: #fff;
    font-family: monospace;
    font-size: 12px;
    min-width: 14px;
    text-align: center;
}

.mode-desc {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #1a1a1a;
    border-left: 3px solid #0ff;
}

.mode-desc strong {
    color: #0ff;
    display: block;
    margin-bottom: 4px;
}

.secret-hint {
    margin-top: 30px;
    text-align: center;
    color: #666;
    border-top: 1px dashed #333;
    padding-top: 10px;
}

/* Scrollbar Styling */
#instructions-panel::-webkit-scrollbar {
    width: 8px;
}

#instructions-panel::-webkit-scrollbar-track {
    background: #111;
}

#instructions-panel::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 4px;
}

#instructions-panel::-webkit-scrollbar-thumb:hover {
    background: #666;
}

/* Colors for Blocks */
.color-i {
    color: #ff0000;
}

.color-l {
    color: #4488ff;
}

.color-j {
    color: #ff8800;
}

.color-o {
    color: #ffff00;
}

.color-t {
    color: #00ffff;
}

.color-s {
    color: #d040d0;
}

.color-z {
    color: #00ff00;
}

.color-special {
    color: #ffffff;
}

.color-frozen {
    color: #88bbff;
    text-shadow: 0 0 4px #4488ff;
}

.color-garbage {
    color: #888888;
}

.color-shadow {
    color: #444444;
}

.color-blank {
    color: #111111;
}

.color-flash {
    animation: flash 0.1s infinite;
    color: #fff;
    text-shadow: 0 0 5px #fff;
}

@keyframes flash {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }

    100% {
        opacity: 1;
    }
}

.hidden-row {
    background-color: #1a1a2a;
    opacity: 0.6;
}

.color-flash {
    color: #ffffff;
    text-shadow: 0 0 8px #ffffff, 0 0 16px #aaaaff;
}