:root {
    --primary-color: #4285F4;
    --comfort-color: #34A853;
    --insult-color: #EA4335;
    --win-color: #34A853;
    --lose-color: #EA4335;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --shadow-soft: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-deep: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    /* Subtle noise texture */
    background-image: url("https://www.transparenttextures.com/patterns/cubes.png");
    color: var(--text-main);
    text-align: center;
    padding: 40px 20px;
    box-sizing: border-box;
    overflow-x: hidden;
    line-height: 1.5;
}

/* Auth Styles */
#authContainer {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1000;
}

#userProfile {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.95); /* Increased opacity, removed backdrop-filter for perf */
    padding: 6px 16px;
    border-radius: 30px;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

#userPhoto {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid white;
}

#userName {
    font-weight: 600;
    font-size: 0.95em;
    color: var(--text-main);
}

.auth-btn {
    padding: 10px 20px;
    font-size: 0.9em;
    font-weight: 600;
    border: none;
    border-radius: 30px;
    cursor: pointer;
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(66, 133, 244, 0.39);
    transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s; /* Specific transitions */
}

.auth-btn:hover {
    background-color: #357ae8;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(66, 133, 244, 0.23);
}

#logoutButton {
    background-color: white;
    color: var(--text-main);
    border: 1px solid #e2e8f0;
    box-shadow: var(--shadow-soft);
}

#logoutButton:hover {
    background-color: #f1f5f9;
}


h1 {
    color: var(--text-main);
    margin-bottom: 10px;
    font-size: 3em;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#lifeContainer {
    position: relative;
    margin-bottom: 40px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#lifeDisplay {
    font-size: 2.5em;
    font-weight: 900;
    color: var(--primary-color);
    text-shadow: 0 4px 10px rgba(66, 133, 244, 0.1);
}

.floating-text {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5em;
    font-weight: 900;
    pointer-events: none;
    animation-duration: 0.8s;
    animation-timing-function: cubic-bezier(0.18, 0.89, 0.32, 1.28);
    animation-fill-mode: forwards;
    opacity: 1;
    z-index: 10;
    will-change: transform, opacity; /* Performance optimization */
}

.plus {
    color: var(--comfort-color);
    animation-name: float-up;
}

.minus {
    color: var(--insult-color);
    animation-name: fall-down;
}

@keyframes float-up {
    from {
        opacity: 0;
        transform: translate(-50%, 0%) scale(0.5);
    }
    30% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.2);
    }
    to {
        opacity: 0;
        transform: translate(-50%, -150%) scale(1);
    }
}

@keyframes fall-down {
    from {
        opacity: 0;
        transform: translate(-50%, -100%) rotate(-10deg) scale(0.5);
    }
    30% {
        opacity: 1;
        transform: translate(-50%, -50%) rotate(0deg) scale(1.2);
    }
    to {
        opacity: 0;
        transform: translate(-50%, 100%) rotate(15deg) scale(1);
    }
}


.button-container {
    display: flex;
    gap: 24px;
    margin-bottom: 50px;
    flex-wrap: wrap;
    justify-content: center;
}

button {
    padding: 16px 36px;
    font-size: 1.1em;
    font-weight: 700;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    /* Performance: animate only necessary properties */
    transition: transform 0.1s ease, box-shadow 0.2s ease;
    box-shadow: var(--shadow-soft);
}

button.start-game {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    padding: 20px 48px;
    font-size: 1.3em;
}
button.start-game:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.3);
}

button.comfort {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
}

button.comfort:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.3);
}

button.insult {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
}

button.insult:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(239, 68, 68, 0.3);
}

button:active {
    transform: translateY(1px) !important;
}

button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

#messageDisplay {
    min-height: 120px;
    width: 90%;
    max-width: 640px;
    background-color: var(--card-bg);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow-deep);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.6em;
    font-weight: 700;
    color: var(--text-muted);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
    margin-bottom: 30px;
    border: 1px solid rgba(0,0,0,0.03);
}

#messageDisplay.comfort-message {
    color: var(--comfort-color);
    background-color: #f0fdf4;
    border-color: #bbf7d0;
}

#messageDisplay.insult-message {
    color: var(--insult-color);
    background-color: #fef2f2;
    border-color: #fecaca;
}

#messageDisplay.win-message {
    color: var(--win-color);
    font-size: 2.2em;
    background: linear-gradient(to bottom, #f0fdf4, #ffffff);
}

#messageDisplay.lose-message {
    color: var(--lose-color);
    font-size: 2.2em;
    background: linear-gradient(to bottom, #fef2f2, #ffffff);
}

#gameExplanation {
    margin-top: 10px;
    font-size: 1.1em;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 60px;
}

/* Comment Section Styles */
#commentSection {
    width: 90%;
    max-width: 640px;
    background-color: var(--card-bg);
    padding: 32px;
    border-radius: 24px;
    box-shadow: var(--shadow-deep);
    text-align: left;
    margin-top: 20px;
    margin-bottom: 80px;
    border: 1px solid rgba(0,0,0,0.03);
}

#commentSection h3 {
    margin-top: 0;
    color: var(--text-main);
    font-size: 1.5em;
    font-weight: 800;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}

#commentSection h3::before {
    content: '💬';
    font-size: 0.9em;
}

.comment-form {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
}

.comment-form input[type="text"] {
    flex: 1;
    padding: 14px 20px;
    border: 2px solid #f1f5f9;
    border-radius: 14px;
    font-size: 1em;
    font-weight: 500;
    transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s;
    background-color: #f8fafc;
}

.comment-form input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: white;
    box-shadow: 0 0 0 4px rgba(66, 133, 244, 0.1);
}

.comment-form button {
    padding: 14px 28px;
    font-size: 1em;
    background-color: var(--text-main);
    color: white;
    margin: 0;
    border-radius: 14px;
}

.comment-form button:hover {
    background-color: #000;
}

#commentList {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 8px;
}

/* Scrollbar styling */
#commentList::-webkit-scrollbar {
    width: 6px;
}
#commentList::-webkit-scrollbar-thumb {
    background: #e2e8f0;
    border-radius: 10px;
}

.comment-item {
    background-color: white;
    border: 1px solid #f1f5f9;
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 12px;
    transition: transform 0.2s, border-color 0.2s;
}

.comment-item:hover {
    border-color: #e2e8f0;
    transform: translateX(4px);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.comment-author {
    font-weight: 700;
    color: var(--text-main);
    font-size: 1.05em;
}

.comment-date {
    font-size: 0.85em;
    color: var(--text-muted);
}

.delete-comment-btn {
    background: #fff1f2;
    border: none;
    color: var(--insult-color);
    cursor: pointer;
    font-size: 0.85em;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 8px;
    margin-left: 10px;
    transition: background-color 0.2s, color 0.2s;
}

.delete-comment-btn:hover {
    background: var(--insult-color);
    color: white;
    text-decoration: none;
}

.comment-text {
    font-size: 1.05em;
    color: #334155;
    line-height: 1.6;
}

.empty-message {
    text-align: center;
    color: var(--text-muted);
    padding: 40px 20px;
    font-weight: 500;
    background: #f8fafc;
    border-radius: 16px;
    border: 2px dashed #e2e8f0;
}

#loginRequestMsg {
    background: #f8fafc;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    margin-bottom: 24px;
}

@media (max-width: 600px) {
    #authContainer {
        position: static;
        flex-direction: row;
        justify-content: center;
        width: 100%;
        margin-bottom: 20px;
        padding: 0;
    }

    h1 {
        font-size: 2.2em;
        margin-top: 10px;
    }
    
    #lifeDisplay {
        font-size: 2em;
    }
}

/* Loading Overlay */
#loadingOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.85);
    /* backdrop-filter removed for performance, or kept simple */
    z-index: 2000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    color: var(--text-main);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 5px solid #e2e8f0;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}