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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 2400px;
    margin: 0 auto;
    padding: 0 20px;
}

.content-wrapper {
    display: flex;
    gap: 20px;
    position: relative;
}

header {
    background: white;
    padding: 10px 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    color: #667eea;
    font-size: 1.5rem;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.auto-refresh {
    color: #667eea;
    font-weight: bold;
}

.main-content {
    flex: 1;
    display: grid;
    gap: 20px;
    transition: margin-right 0.3s ease;
}

/* Right Sidebar Styles */
.right-sidebar {
    width: 250px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 20px;
    position: fixed;
    top: 20px;
    right: 20px;
    height: fit-content;
    max-height: calc(100vh - 40px);
    transition: all 0.3s ease;
    z-index: 100;
}

.right-sidebar.collapsed {
    width: 60px;
}

.right-sidebar.collapsed .sidebar-content {
    display: none;
}

.sidebar-toggle {
    position: absolute;
    left: -15px;
    top: 20px;
    width: 30px;
    height: 30px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    z-index: 10;
}

.sidebar-toggle:hover {
    background: #5568d3;
    transform: scale(1.1);
}

.right-sidebar.collapsed .sidebar-toggle {
    left: -15px;
}

.right-sidebar:not(.collapsed) .sidebar-toggle #sidebarToggleIcon {
    transform: rotate(0deg);
}

.right-sidebar.collapsed .sidebar-toggle #sidebarToggleIcon {
    transform: rotate(180deg);
}

.sidebar-content {
    transition: opacity 0.3s ease;
}

.sidebar-content h3 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.sidebar-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.sidebar-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.sidebar-icon {
    font-size: 1.5rem;
}

.sidebar-text {
    flex: 1;
    text-align: left;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.card h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: 600;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

/* Button Styles */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-success {
    background: #10b981;
    color: white;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
}

.btn-warning {
    background: #f59e0b;
    color: white;
}

.btn-warning:hover {
    background: #d97706;
    transform: translateY(-2px);
}

.btn-danger {
    background: #ef4444;
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6b7280;
    color: white;
}

.btn-secondary:hover {
    background: #4b5563;
    transform: translateY(-2px);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.875rem;
}

/* Search Bar */
.search-bar {
    margin-bottom: 20px;
}

.search-bar input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
}

/* Students Grid */
.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    max-height: 65vh;
    overflow-y: auto;
    padding-right: 8px;
}

.students-grid::-webkit-scrollbar {
    width: 8px;
}

.students-grid::-webkit-scrollbar-track {
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
}

.students-grid::-webkit-scrollbar-thumb {
    background: rgba(102, 126, 234, 0.6);
    border-radius: 10px;
}

.students-grid::-webkit-scrollbar-thumb:hover {
    background: rgba(102, 126, 234, 0.8);
}

.student-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s;
    min-height: auto;
    height: auto;
    overflow: hidden;
    box-sizing: border-box;
}

/* Rank-specific background colors for student cards */
.student-card[data-rank="0"] {
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%); /* Wood - Brown */
}

.student-card[data-rank="1"] {
    background: linear-gradient(135deg, #CD7F32 0%, #B87333 100%); /* Bronze */
}

.student-card[data-rank="2"] {
    background: linear-gradient(135deg, #C0C0C0 0%, #A8A8A8 100%); /* Silver */
}

.student-card[data-rank="3"] {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%); /* Gold */
}

.student-card[data-rank="4"] {
    background: linear-gradient(135deg, #E5E4E2 0%, #D3D3D3 100%); /* Platinum */
}

.student-card[data-rank="5"] {
    background: linear-gradient(135deg, #B9F2FF 0%, #00CED1 100%); /* Diamond */
}

.student-card[data-rank="6"] {
    background: linear-gradient(135deg, #9370DB 0%, #663399 100%); /* Candidate Master */
}

.student-card[data-rank="7"] {
    background: linear-gradient(135deg, #FF1493 0%, #C71585 100%); /* Master */
}

.student-card[data-rank="8"] {
    background: linear-gradient(135deg, #FF4500 0%, #FF6347 100%); /* International Master */
}

.student-card[data-rank="9"] {
    background: linear-gradient(135deg, #FF0000 0%, #8B0000 100%); /* Grand Master */
}

.student-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.student-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.student-card .student-id {
    opacity: 0.9;
    font-size: 0.8rem;
    margin-bottom: 8px;
    color: white;
}

/* Rank Badge */
.rank-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.75rem;
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: rgba(255, 255, 255, 0.3);
    color: white;
}

.rank-0 { background: rgba(139, 69, 19, 0.8) !important; color: white; } /* Wood */
.rank-1 { background: rgba(205, 127, 50, 0.8) !important; color: white; } /* Bronze */
.rank-2 { background: rgba(192, 192, 192, 0.8) !important; color: #333; } /* Silver */
.rank-3 { background: rgba(255, 215, 0, 0.8) !important; color: #333; } /* Gold */
.rank-4 { background: rgba(229, 228, 226, 0.8) !important; color: #333; } /* Platinum */
.rank-5 { background: rgba(185, 242, 255, 0.8) !important; color: #333; } /* Diamond */
.rank-6 { background: rgba(147, 112, 219, 0.8) !important; color: white; } /* Candidate Master */
.rank-7 { background: rgba(255, 20, 147, 0.8) !important; color: white; } /* Master */
.rank-8 { background: rgba(255, 69, 0, 0.8) !important; color: white; } /* International Master */
.rank-9 { background: rgba(255, 0, 0, 0.8) !important; color: white; } /* Grand Master */

/* Rank Progress - Simplified with Green Bar */
.rank-progress {
    margin: 8px 0;
}

.progress-bar {
    width: 100%;
    height: 14px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 7px;
    overflow: hidden;
    margin-bottom: 3px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
    transition: width 0.3s ease;
    border-radius: 7px;
}

.progress-text {
    font-size: 0.65rem;
    opacity: 0.9;
    text-align: center;
    color: white;
}

.student-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    margin-bottom: 10px;
}

.stat-item {
    background: rgba(255, 255, 255, 0.2);
    padding: 6px;
    border-radius: 6px;
    text-align: center;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: bold;
    display: block;
}

.stat-label {
    font-size: 0.7rem;
    opacity: 0.9;
}

.student-actions {
    display: flex;
    gap: 6px;
    margin-top: 10px;
    align-items: center;
}

.student-actions button {
    flex: 1;
}

.student-actions input.points-input {
    width: 60px !important;
    padding: 6px !important;
    text-align: center !important;
    border: 2px solid rgba(255,255,255,0.3) !important;
    border-radius: 6px !important;
    background: rgba(255,255,255,0.2) !important;
    color: white !important;
    font-weight: bold !important;
    font-size: 0.9rem !important;
}

.student-actions input.points-input::-webkit-inner-spin-button,
.student-actions input.points-input::-webkit-outer-spin-button {
    opacity: 1;
}

/* Quick Answer Form */
.quick-answer-form {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.quick-answer-form select {
    flex: 1;
    min-width: 200px;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
}

/* Leaderboard */
.leaderboard {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.leaderboard-item.top-1 {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    transform: scale(1.05);
}

.leaderboard-item.top-2 {
    background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
}

.leaderboard-item.top-3 {
    background: linear-gradient(135deg, #cd7f32 0%, #a0522d 100%);
}

.rank {
    font-size: 1.5rem;
    font-weight: bold;
    margin-right: 15px;
    min-width: 40px;
    text-align: center;
}

.leaderboard-info {
    flex: 1;
}

.leaderboard-info h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.leaderboard-stats {
    display: flex;
    gap: 20px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.score-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 1.1rem;
}

/* Students List for Student View */
.students-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.student-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
}

/* Rank-specific background colors for student list items */
.student-list-item[data-rank="0"] {
    background: linear-gradient(135deg, #8B4513 0%, #A0522D 100%); /* Wood - Brown */
}

.student-list-item[data-rank="1"] {
    background: linear-gradient(135deg, #CD7F32 0%, #B87333 100%); /* Bronze */
}

.student-list-item[data-rank="2"] {
    background: linear-gradient(135deg, #C0C0C0 0%, #A8A8A8 100%); /* Silver */
}

.student-list-item[data-rank="3"] {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%); /* Gold */
}

.student-list-item[data-rank="4"] {
    background: linear-gradient(135deg, #E5E4E2 0%, #D3D3D3 100%); /* Platinum */
}

.student-list-item[data-rank="5"] {
    background: linear-gradient(135deg, #B9F2FF 0%, #00CED1 100%); /* Diamond */
}

.student-list-item[data-rank="6"] {
    background: linear-gradient(135deg, #9370DB 0%, #663399 100%); /* Candidate Master */
}

.student-list-item[data-rank="7"] {
    background: linear-gradient(135deg, #FF1493 0%, #C71585 100%); /* Master */
}

.student-list-item[data-rank="8"] {
    background: linear-gradient(135deg, #FF4500 0%, #FF6347 100%); /* International Master */
}

.student-list-item[data-rank="9"] {
    background: linear-gradient(135deg, #FF0000 0%, #8B0000 100%); /* Grand Master */
}

.student-list-item h3 {
    color: white;
    margin: 0;
}

.student-list-item .student-id {
    color: rgba(255, 255, 255, 0.9);
}

.student-list-stats {
    display: flex;
    gap: 20px;
    align-items: center;
}

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    background: #10b981;
    color: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    animation: slideIn 0.3s ease-out;
    z-index: 1000;
}

.notification.error {
    background: #ef4444;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .header-actions {
        width: 100%;
        justify-content: center;
    }

    .students-grid {
        grid-template-columns: 1fr;
    }

    .quick-answer-form {
        flex-direction: column;
    }

    .quick-answer-form select,
    .quick-answer-form button {
        width: 100%;
    }
}

/* Floating Window Indicator */
.floating-indicator {
    position: fixed;
    top: 10px;
    left: 10px;
    background: rgba(102, 126, 234, 0.9);
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.75rem;
    z-index: 10000;
    pointer-events: none;
    display: none; /* Hidden in browser, visible in Electron */
}

body.electron .floating-indicator {
    display: block;
}

/* Class Students Selection List */
.class-students-list {
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 10px;
}

.class-student-checkbox {
    display: flex;
    align-items: center;
    padding: 10px;
    margin-bottom: 5px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.class-student-checkbox:hover {
    background-color: #f5f5f5;
}

.class-student-checkbox input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #667eea;
}

.class-student-checkbox span {
    flex: 1;
    font-size: 0.95rem;
    color: #333;
}

.class-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
}

.selected-count {
    color: #667eea;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Challenge Mode Styles */
.challenge-card {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    border: 2px solid #667eea;
}

.challenge-display {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.challenge-level {
    display: flex;
    align-items: center;
    gap: 15px;
}

.level-emoji {
    font-size: 3rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.level-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.level-name {
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
}

.level-reward {
    font-size: 1rem;
    color: #ffd700;
}

.monster-hp-container {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 15px;
    padding: 20px;
    position: relative;
    min-height: 200px;
}

.monster-display {
    text-align: center;
    margin-bottom: 20px;
}

.monster-emoji {
    font-size: 5rem;
    animation: float 3s ease-in-out infinite;
    display: inline-block;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.monster-name {
    font-size: 1.2rem;
    font-weight: bold;
    margin-top: 10px;
    color: #fff;
}

.hp-bar-container {
    margin-top: 20px;
}

.hp-label {
    font-size: 1rem;
    font-weight: bold;
    margin-bottom: 10px;
    color: #fff;
    text-align: center;
}

.hp-bar {
    width: 100%;
    height: 30px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.3);
    position: relative;
}

.hp-fill {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #059669 50%, #ef4444 100%);
    transition: width 0.5s ease, background 0.3s ease;
    border-radius: 13px;
    position: relative;
    overflow: hidden;
}

.hp-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.3) 50%, transparent 100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Attack Animation Area */
.attack-animation-area {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.attack-effect {
    position: absolute;
    font-size: 2rem;
    font-weight: bold;
    color: #ff6b6b;
    text-shadow: 0 0 10px rgba(255, 107, 107, 0.8);
    animation: attackFloat 1s ease-out forwards;
    pointer-events: none;
}

@keyframes attackFloat {
    0% {
        opacity: 1;
        transform: translateY(0) scale(0.5);
    }
    100% {
        opacity: 0;
        transform: translateY(-100px) scale(1.5);
    }
}

.damage-number {
    position: absolute;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 0 15px rgba(255, 215, 0, 1), 0 0 25px rgba(255, 215, 0, 0.8);
    animation: damageFloat 1s ease-out forwards;
    pointer-events: none;
}

@keyframes damageFloat {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-80px) scale(1.3);
    }
}

/* Level Complete Animation */
.level-complete {
    animation: levelComplete 2s ease-out;
}

@keyframes levelComplete {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.monster-defeated {
    animation: defeated 1s ease-out forwards;
}

@keyframes defeated {
    0% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: scale(0) rotate(360deg);
        opacity: 0;
    }
}

/* Points Gain Animation */
.points-popup {
    position: fixed;
    pointer-events: none;
    z-index: 10000;
    font-size: 2rem;
    font-weight: bold;
    animation: pointsFloat 0.8s ease-out forwards;
}

@keyframes pointsFloat {
    0% {
        opacity: 1;
        transform: translateY(0) scale(0.5);
    }
    50% {
        opacity: 1;
        transform: translateY(-30px) scale(1.2);
    }
    100% {
        opacity: 0;
        transform: translateY(-60px) scale(1);
    }
}

.points-popup.small {
    color: #10b981;
    text-shadow: 0 0 10px rgba(16, 185, 129, 0.8);
}

.points-popup.medium {
    color: #3b82f6;
    text-shadow: 0 0 10px rgba(59, 130, 246, 0.8);
}

.points-popup.large {
    color: #ffd700;
    text-shadow: 0 0 15px rgba(255, 215, 0, 1), 0 0 25px rgba(255, 215, 0, 0.8);
    font-size: 2.5rem;
}

/* Card Flash Effect */
.card-flash {
    animation: cardFlash 0.5s ease-out;
}

@keyframes cardFlash {
    0%, 100% {
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    }
    50% {
        box-shadow: 0 10px 30px rgba(102, 126, 234, 0.8), 0 0 40px rgba(102, 126, 234, 0.6);
        transform: scale(1.02);
    }
}

/* Particle Effect */
.particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #ffd700;
    border-radius: 50%;
    pointer-events: none;
    animation: particleExplode 1s ease-out forwards;
}

@keyframes particleExplode {
    0% {
        opacity: 1;
        transform: scale(1) translate(0, 0);
    }
    100% {
        opacity: 0;
        transform: scale(0) translate(var(--tx), var(--ty));
    }
}

.btn-warning {
    background: #f59e0b;
    color: white;
}

.btn-warning:hover {
    background: #d97706;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-info {
    background: #3b82f6;
    color: white;
}

.btn-info:hover {
    background: #2563eb;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideDown 0.3s;
}

.modal-content.modal-large {
    max-width: 800px;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 2px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    color: #667eea;
    font-size: 1.5rem;
}

.modal-close {
    font-size: 2rem;
    font-weight: bold;
    color: #999;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s;
}

.modal-close:hover {
    color: #333;
}

.modal-body {
    padding: 25px;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.search-group {
    margin-bottom: 20px;
}

.search-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.search-group input:focus {
    outline: none;
    border-color: #667eea;
}

.saves-section {
    margin-bottom: 25px;
}

.saves-section h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.saves-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.save-item {
    background: #f8f9fa;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.save-item:hover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateX(5px);
}

.save-item-info {
    flex: 1;
}

.save-item-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.save-item-day {
    font-weight: bold;
    color: #667eea;
    font-size: 1.1rem;
}

.save-item-time {
    font-weight: bold;
    color: #333;
}

.save-item-details {
    font-size: 0.9rem;
    color: #666;
    margin-top: 5px;
}

.save-item-level {
    display: inline-block;
    background: #667eea;
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: bold;
}

.save-item-actions {
    display: flex;
    gap: 5px;
}

.save-item-btn {
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.save-item-btn.load {
    background: #10b981;
    color: white;
}

.save-item-btn.load:hover {
    background: #059669;
}

.save-item-btn.delete {
    background: #ef4444;
    color: white;
}

.save-item-btn.delete:hover {
    background: #dc2626;
}

.save-item-hidden {
    display: none;
}

.no-saves {
    text-align: center;
    color: #999;
    padding: 20px;
    font-style: italic;
}

/* Statistics Modal Styles */
.period-selector {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    justify-content: center;
}

.period-btn {
    padding: 10px 20px;
    border: 2px solid #667eea;
    border-radius: 8px;
    background: white;
    color: #667eea;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: all 0.3s;
}

.period-btn:hover {
    background: #f0f4ff;
}

.period-btn.active {
    background: #667eea;
    color: white;
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    color: white;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.leaderboard-section {
    margin-top: 30px;
}

.leaderboard-section h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.leaderboard-table {
    background: #f8f9fa;
    border-radius: 8px;
    overflow: hidden;
}

.leaderboard-row {
    display: grid;
    grid-template-columns: 60px 1fr 120px 120px;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    align-items: center;
    transition: background 0.2s;
}

.leaderboard-row:hover {
    background: #f0f4ff;
}

.leaderboard-row:first-child {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: white;
    font-weight: bold;
}

.leaderboard-row:nth-child(2) {
    background: linear-gradient(135deg, #C0C0C0 0%, #A8A8A8 100%);
    color: white;
    font-weight: bold;
}

.leaderboard-row:nth-child(3) {
    background: linear-gradient(135deg, #CD7F32 0%, #B87333 100%);
    color: white;
    font-weight: bold;
}

.leaderboard-rank {
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
}

.leaderboard-name {
    font-weight: 500;
}

.leaderboard-answers,
.leaderboard-points {
    text-align: center;
    font-weight: 500;
}

.leaderboard-header {
    display: grid;
    grid-template-columns: 60px 1fr 120px 120px;
    padding: 12px 20px;
    background: #667eea;
    color: white;
    font-weight: bold;
    text-align: center;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #999;
    font-style: italic;
}

/* Game Zone Modal Styles */
.modal-header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.btn-icon {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.btn-icon:hover {
    background: #667eea;
    color: white;
}

.modal-content.game-zone-fullscreen {
    width: 100vw;
    height: 100vh;
    max-width: 100vw;
    max-height: 100vh;
    border-radius: 0;
    margin: 0;
}

.modal-content.game-zone-large {
    width: 95vw;
    height: 90vh;
    max-width: 95vw;
    max-height: 90vh;
}

.game-selection-section,
.student-selection-section {
    margin-bottom: 30px;
}

.game-selection-section h3,
.student-selection-section h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.game-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.game-item {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    color: white;
}

.game-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.game-icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.game-info h4 {
    margin-bottom: 5px;
    font-size: 1.2rem;
}

.game-info p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.student-selector-toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    align-items: center;
}

.student-search-input {
    flex: 1;
    padding: 10px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
}

.student-search-input:focus {
    outline: none;
    border-color: #667eea;
}

.student-selector-list {
    max-height: 300px;
    overflow-y: auto;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 10px;
    background: #f8f9fa;
}

.student-selector-item {
    display: flex;
    align-items: center;
    padding: 10px;
    margin-bottom: 5px;
    background: white;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s;
}

.student-selector-item:hover {
    background: #f0f4ff;
}

.student-selector-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    cursor: pointer;
}

.student-selector-item.selected {
    background: #e0f2fe;
    border: 2px solid #667eea;
}

.game-area-section {
    margin-top: 20px;
}

.game-area-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.game-area-content {
    min-height: 400px;
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}