/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* App Container - Full Height Layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    margin: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    border-radius: 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Left Sidebar */
.sidebar {
    width: 260px;
    min-width: 260px;
    background: linear-gradient(180deg, rgba(248, 249, 250, 0.95) 0%, rgba(240, 242, 247, 0.95) 100%);
    backdrop-filter: blur(10px);
    color: #2c3e50;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    border-right: 1px solid rgba(0, 0, 0, 0.06);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 1000;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
    position: relative;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 20%, rgba(102, 126, 234, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(118, 75, 162, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.sidebar-header {
    padding: 15px;
    text-align: center;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.6) 0%, rgba(248, 249, 250, 0.8) 100%);
    backdrop-filter: blur(5px);
    position: relative;
    transition: all 0.3s ease;
    display: block;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

#logoArea:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(248, 249, 250, 0.9) 100%);
    border-bottom-color: rgba(102, 126, 234, 0.2);
}

#logoArea:hover .logo {
    transform: scale(1.02);
}

#logoArea:hover .tagline {
    color: #667eea;
}

.sidebar-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: transform 0.3s ease;
}

.logo-number {
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    color: #2c3e50;
}

.tagline {
    color: #6c757d;
    font-size: 0.8rem;
    font-weight: 400;
    transition: color 0.3s ease;
}

/* Game Menu */
.game-menu {
    flex: 1;
    padding: 15px 0;
}

.menu-title {
    padding: 12px 15px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #495057;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(248, 249, 250, 0.6) 100%);
    border-radius: 8px 8px 0 0;
    margin: 0 10px;
    position: relative;
}

.menu-title::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, #667eea 50%, transparent 100%);
}

.game-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    padding: 8px 10px;
}

.game-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 12px 8px;
    color: #5a6c7d;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(5px);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.game-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, #667eea, transparent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.game-item:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.9) 100%);
    color: #2c3e50;
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
    transform: translateY(-2px);
}

.game-item:hover::before {
    transform: scaleX(1);
}

.game-item.active {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.12) 0%, rgba(118, 75, 162, 0.08) 100%);
    color: #2c3e50;
    border-color: #667eea;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.25);
    transform: translateY(-2px);
}

.game-item.active::before {
    transform: scaleX(1);
}

.game-icon {
    font-size: 2rem;
    width: 100%;
    text-align: center;
    margin-bottom: 6px;
    filter: grayscale(0.2);
    transition: all 0.3s ease;
}

.game-item:hover .game-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.game-item.active .game-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.game-info {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.game-title {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: #34495e;
    line-height: 1.2;
    text-align: center;
}

.game-item:hover .game-title {
    color: #2c3e50;
    font-weight: 700;
}

.game-item.active .game-title {
    color: #2c3e50;
    font-weight: 700;
}

.game-description {
    font-size: 0.65rem;
    color: #7f8c8d;
    line-height: 1.2;
    font-weight: 400;
    text-align: center;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.game-item:hover .game-description {
    color: #5a6c7d;
}

.game-item.active .game-description {
    color: #5a6c7d;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    overflow-x: hidden;
    overflow-y: auto;
    width: calc(100vw - 260px);
    height: 100vh;
    max-width: calc(100vw - 260px);
}

.game-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    z-index: 1;
    overflow-x: hidden;
    overflow-y: auto;
}

.game-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    color: #2c3e50;
    padding: 8px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.game-header h2 {
    font-size: 0.9rem;
    font-weight: 600;
    color: #2c3e50;
    letter-spacing: 0.3px;
}

.back-btn {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(44, 62, 80, 0.15);
    color: #2c3e50;
    padding: 8px 16px 8px 28px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.2s ease;
    backdrop-filter: blur(5px);
    position: relative;
    overflow: hidden;
}

.back-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 12px;
    width: 6px;
    height: 6px;
    border-left: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translateY(-50%) rotate(45deg);
    transition: all 0.2s ease;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(44, 62, 80, 0.25);
    color: #1a252f;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.back-btn:hover::before {
    transform: translateY(-50%) rotate(45deg) translateX(-2px);
}

/* Game Frame Container */
.game-frame-container {
    flex: 1;
    position: relative;
    overflow: auto;
    width: 100%;
    max-width: 100%;
}

.game-iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* Welcome Message */
.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px;
    color: #666;
    position: relative;
}

.welcome-message::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.08) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.welcome-message h2 {
    font-size: 2rem;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: 600;
}

.welcome-message p {
    font-size: 1.1rem;
    margin-bottom: 40px;
    color: #7f8c8d;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 600px;
    width: 100%;
}

.feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 2rem;
}

.feature span:last-child {
    font-size: 0.9rem;
    font-weight: 500;
    color: #2c3e50;
}

/* Loading Animation */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #4ecdc4;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Mobile overflow prevention */
@media (max-width: 768px) {
    body {
        overflow-x: hidden;
    }
    
    html, body {
        max-width: 100%;
        overflow-x: hidden;
    }
    
    * {
        max-width: 100%;
        box-sizing: border-box;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
        height: 100vh;
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        order: 2;
        position: fixed;
        left: 0;
        bottom: 0;
        top: auto;
        z-index: 1000;
        background: linear-gradient(0deg, rgba(248, 249, 250, 0.98) 0%, rgba(240, 242, 247, 0.98) 100%);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0, 0, 0, 0.1);
        border-right: none;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(0);
        transition: transform 0.3s ease;
    }
    
    .main-content {
        order: 1;
        height: 100vh;
        margin-left: 0;
        width: 100%;
        max-width: 100%;
        padding-bottom: 90px;
        overflow-x: hidden;
    }
    
    .sidebar-header {
        padding: 8px 15px;
        display: none;
    }
    
    .game-menu {
        padding: 10px 0;
    }
    
    .menu-title {
        display: none;
    }
    
    .game-list {
        display: flex;
        flex-direction: row;
        gap: 8px;
        padding: 0 15px;
        overflow-x: auto;
        overflow-y: hidden;
        scrollbar-width: thin;
        scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
        -webkit-overflow-scrolling: touch;
    }
    
    .game-list::-webkit-scrollbar {
        height: 4px;
    }
    
    .game-list::-webkit-scrollbar-track {
        background: rgba(0, 0, 0, 0.05);
        border-radius: 2px;
    }
    
    .game-list::-webkit-scrollbar-thumb {
        background: rgba(0, 0, 0, 0.2);
        border-radius: 2px;
    }
    
    .game-item {
        flex-direction: column;
        text-align: center;
        padding: 10px 12px;
        border: 1px solid rgba(0, 0, 0, 0.08);
        border-radius: 10px;
        background: rgba(255, 255, 255, 0.6);
        backdrop-filter: blur(5px);
        justify-content: center;
        align-items: center;
        flex-shrink: 0;
        min-width: 80px;
    }
    
    .game-item:hover {
        background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.9) 100%);
        border-color: rgba(102, 126, 234, 0.3);
        box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
        transform: translateY(-2px);
    }
    
    .game-item.active {
        background: linear-gradient(135deg, rgba(102, 126, 234, 0.12) 0%, rgba(118, 75, 162, 0.08) 100%);
        border-color: #667eea;
        box-shadow: 0 4px 16px rgba(102, 126, 234, 0.25);
        transform: translateY(-2px);
    }
    
    .game-icon {
        font-size: 1.8rem;
        margin-bottom: 4px;
        width: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    
    .game-item .game-info {
        width: 100%;
    }
    
    .game-title {
        font-size: 0.7rem;
        margin-bottom: 2px;
        font-weight: 600;
        text-align: center;
        line-height: 1.2;
    }
    
    .game-description {
        display: none;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .welcome-message {
        padding: 20px;
    }
    
    .welcome-icon {
        font-size: 3rem;
    }
    
    .welcome-message h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .main-content {
        height: 100vh;
        margin-left: 0;
        width: 100%;
        max-width: 100%;
        padding-bottom: 85px;
        overflow-x: hidden;
    }
    
    .game-list {
        padding: 0 10px;
        gap: 6px;
    }
    
    .game-item {
        padding: 8px 10px;
        min-width: 70px;
    }
    
    .game-icon {
        font-size: 1.6rem;
        margin-bottom: 3px;
        width: 100%;
    }
    
    .game-title {
        font-size: 0.65rem;
        font-weight: 600;
        text-align: center;
        line-height: 1.2;
    }
    
    .welcome-message {
        padding: 20px;
    }
    
    .welcome-icon {
        font-size: 2.5rem;
        margin-bottom: 15px;
    }
    
    .welcome-message h2 {
        font-size: 1.3rem;
        margin-bottom: 10px;
    }
    
    .welcome-message p {
        font-size: 0.9rem;
        margin-bottom: 25px;
    }
    
    .features {
        gap: 15px;
    }
    
    .feature {
        padding: 15px;
    }
    
    .feature-icon {
        font-size: 1.5rem;
    }
    
    .feature span:last-child {
        font-size: 0.8rem;
    }
}

.guide-content {
    padding: 40px;
    max-width: 800px;
    margin: 0 auto;
    color: #2c3e50;
}

.guide-header {
    text-align: center;
    margin-bottom: 40px;
}

.guide-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 10px;
}

.guide-header p {
    font-size: 1.1rem;
    color: #6c757d;
    margin-bottom: 0;
}

.faq-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.faq-item {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.faq-question {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 15px;
    line-height: 1.4;
}

.faq-answer {
    color: #495057;
    line-height: 1.6;
}

.faq-answer p {
    margin-bottom: 15px;
    font-size: 1rem;
}

.faq-answer ul {
    margin: 15px 0;
    padding-left: 20px;
}

.faq-answer li {
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.faq-answer strong {
    color: #667eea;
    font-weight: 600;
}

/* Video Section */
.video-section {
    margin: 30px 0;
    padding: 25px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.03) 0%, rgba(118, 75, 162, 0.02) 100%);
    border-radius: 16px;
    border: 1px solid rgba(102, 126, 234, 0.1);
    text-align: center;
}

.video-title {
    font-size: 1.3rem;
    color: #2c3e50;
    margin-bottom: 20px;
    font-weight: 600;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 560px;
    margin: 0 auto 15px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.video-container iframe {
    width: 100%;
    height: 315px;
    border: none;
    display: block;
}

.video-description {
    color: #7f8c8d;
    font-size: 0.95rem;
    margin: 0;
    font-style: italic;
}

/* Quick Game Links */
.quick-game-links {
    margin: 30px 0;
    padding: 25px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.03) 0%, rgba(118, 75, 162, 0.02) 100%);
    border-radius: 16px;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.quick-links-title {
    font-size: 1.3rem;
    color: #2c3e50;
    margin-bottom: 20px;
    font-weight: 600;
    text-align: center;
}

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

.game-link-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 18px;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    cursor: pointer;
}

.game-link-item:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.05) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.game-link-icon {
    font-size: 1.5rem;
    width: 30px;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

.game-link-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 4px 0;
    color: #2c3e50;
}

.game-link-info p {
    font-size: 0.8rem;
    color: #7f8c8d;
    margin: 0;
    font-weight: 400;
}

.guide-footer {
    text-align: center;
    margin-top: 40px;
    padding: 25px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: 12px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.guide-footer p {
    font-size: 1.1rem;
    color: #2c3e50;
    margin: 0;
}

.guide-footer strong {
    color: #667eea;
    font-weight: 600;
}

@media (max-width: 768px) {
    .guide-content {
        padding: 20px;
    }
    
    .guide-header h2 {
        font-size: 1.6rem;
    }
    
    .guide-header p {
        font-size: 1rem;
    }
    
    .faq-item {
        padding: 20px;
    }
    
    .faq-question {
        font-size: 1.1rem;
    }
    
    .faq-answer p,
    .faq-answer li {
        font-size: 0.9rem;
    }
    
    .guide-footer {
        padding: 20px;
    }
    
    .guide-footer p {
        font-size: 1rem;
    }
    
    .video-section {
        margin: 20px 0;
        padding: 20px;
    }
    
    .video-title {
        font-size: 1.2rem;
    }
    
    .video-container {
        max-width: 100%;
    }
    
    .video-container iframe {
        height: 250px;
    }
    
    .quick-game-links {
        margin: 20px 0;
        padding: 20px;
    }
    
    .game-links-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .game-link-item {
        padding: 12px 15px;
    }
    
    .game-link-icon {
        font-size: 1.3rem;
        width: 25px;
    }
    
    .game-link-info h4 {
        font-size: 0.9rem;
    }
    
    .game-link-info p {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .guide-content {
        padding: 15px;
    }
    
    .guide-header h2 {
        font-size: 1.4rem;
    }
    
    .faq-item {
        padding: 15px;
    }
    
    .faq-question {
        font-size: 1rem;
    }
    
    .faq-answer p,
    .faq-answer li {
        font-size: 0.85rem;
    }
    
    .video-section {
        margin: 15px 0;
        padding: 15px;
    }
    
    .video-title {
        font-size: 1.1rem;
    }
    
    .video-container iframe {
        height: 200px;
    }
    
    .video-description {
        font-size: 0.9rem;
    }
    
    .quick-game-links {
        margin: 15px 0;
        padding: 15px;
    }
    
    .game-link-item {
        padding: 10px 12px;
    }
    
    .game-link-icon {
        font-size: 1.2rem;
        width: 20px;
    }
    
    .game-link-info h4 {
        font-size: 0.85rem;
    }
    
    .game-link-info p {
        font-size: 0.7rem;
    }
}

/* Footer */
.site-footer {
    padding: 20px 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-info {
    text-align: center;
}

.footer-info p {
    margin: 0;
    color: #6c757d;
    font-size: 0.9rem;
    line-height: 1.5;
}

.footer-info p:first-child {
    font-weight: 600;
    color: #495057;
}

.footer-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

.footer-link {
    color: #6c757d;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: #667eea;
}

/* Hidden class */
.hidden {
    display: none !important;
}

/* Smooth transitions */
* {
    transition: all 0.3s ease;
}

/* Custom scrollbar for sidebar */
.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 2px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}