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

body {
    font-family: 'Nunito', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-color, #1a1a1a);
    background-image: radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    min-height: 100vh;
    color: #e0e0e0;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    padding: 0 20px 0 20px;
    transition: margin-left 0.3s ease;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 15px 20px;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-branding {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-placeholder {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.seo-description {
    margin-top: 40px;
    padding: 20px;
    text-align: left;
    max-width: 600px;
    opacity: 0.7;
}

.seo-description h2 {
    color: #a0a0a0;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    text-transform: none;
}

.seo-description p {
    color: #888;
    font-size: 14px;
    line-height: 1.4;
    margin: 0;
}
.site-branding h1 {
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    font-size: 1.2rem;
    margin: 0;
    color: #e0e0e0;
    letter-spacing: -0.5px;
}

header {
    color: #e0e0e0;
    padding: 80px 20px 0 20px;
    position: relative;
    z-index: 10;
    margin-bottom: 20px;
}

.bingo-inputs {
    text-align: center;
    width: 100%;
    margin: 0 auto;
}

.header-inputs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.input-group label {
    font-size: 1rem;
    font-weight: 600;
    color: #b0b0b0;
    opacity: 0.9;
}

.input-group input {
    padding: 10px 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    font-size: 16px;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
    min-width: 150px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.input-group input:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(100, 200, 255, 0.5), 0 4px 12px rgba(0,0,0,0.3);
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.15);
}

.input-group input::placeholder {
    color: #888;
    font-style: italic;
}



.bingo-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    background-color: var(--grid-color, #333333);
    border-radius: 15px;
    padding: 12px;
    max-width: 600px;
    margin: 0 auto;
    transition: background-color 0.3s ease;
}

.bingo-cell {
    background: var(--cell-color, #2a2a2a);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px;
    font-size: 16px;
    text-align: center;
    resize: none;
    outline: none;
    min-height: 100px;
    font-family: inherit;
    transition: all 0.2s ease;
    border-radius: 8px;
    overflow: hidden;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
    position: relative;
    cursor: pointer;
    color: var(--text-color, #e0e0e0);
}

.bingo-cell.has-image {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: var(--text-color, white);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.7);
}

.bingo-cell.drag-over {
    border: 3px dashed #4D8196;
    background-color: rgba(77, 129, 150, 0.1);
}

.bingo-cell::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.bingo-cell:focus {
    background-color: rgba(100, 200, 255, 0.2);
    box-shadow: inset 0 0 0 2px rgba(100, 200, 255, 0.5);
}

.bingo-cell.free-space {
    background-color: var(--free-space-color, #444444);
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    color: var(--text-color, #e0e0e0);
    cursor: not-allowed;
    border: 2px solid var(--free-space-color, #444444);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.bingo-cell.free-space::placeholder {
    color: #666;
}

.controls {
    text-align: center;
    margin-top: 20px;
}

.btn {
    padding: 12px 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    margin: 0 10px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    backdrop-filter: blur(10px);
}

.btn-primary {
    background: linear-gradient(135deg, #4a90e2, #357abd);
    color: white;
    border-color: rgba(74, 144, 226, 0.5);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
    background: linear-gradient(135deg, #357abd, #2968a3);
}

.btn-secondary {
    background: rgba(42, 42, 42, 0.9);
    color: #e0e0e0;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    margin-top: 30px;
}

/* Desktop: Show sidebar, hide toggle and mobile modal */
@media (min-width: 769px) {
    .main-content {
        margin-right: 300px;
        padding: 0 20px 0 20px;
    }
    
    .container {
        margin: 0 auto;
        max-width: 700px;
    }
    
    .sidebar {
        transform: translateX(0);
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        width: 300px;
    }
    
    .sidebar-toggle {
        display: none;
    }
    
    .options-btn {
        display: none !important;
    }
    
    .mobile-modal {
        display: none !important;
    }
    
    .top-bar {
        right: 300px;
    }
    
    header {
        padding: 80px 20px 0 20px;
        margin-right: 300px;
    }
}

/* Mobile: Hide desktop sidebar, show modal */
@media (max-width: 768px) {
    .desktop-sidebar {
        display: none;
    }
    
    .options-btn {
        display: block !important;
    }
    
    .site-branding h1 {
        font-size: 1rem;
    }
    
    .main-content {
        margin-right: 0;
        padding: 0 20px 0 20px;
    }
    
    .bingo-grid {
        max-width: 100%;
        margin: 0 auto 15px auto;
    }
    
    .bingo-cell {
        min-height: 80px;
        font-size: 14px;
        padding: 12px;
    }
    
    /* Mobile Modal Styles */
    .mobile-modal {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(26, 26, 26, 0.98);
        backdrop-filter: blur(10px);
        border-radius: 20px 20px 0 0;
        transform: translateY(100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        max-height: 70vh;
        overflow-y: auto;
    }
    
    .mobile-modal.open {
        transform: translateY(0);
    }
    
    .modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .modal-tabs {
        display: flex;
        gap: 10px;
    }
    
    .tab-btn {
        background: rgba(255, 255, 255, 0.1);
        border: 1px solid rgba(255, 255, 255, 0.2);
        color: #b0b0b0;
        padding: 10px 20px;
        border-radius: 20px;
        cursor: pointer;
        transition: all 0.2s ease;
        font-size: 14px;
    }
    
    .tab-btn.active {
        background: rgba(255, 255, 255, 0.2);
        color: #ffffff;
        border-color: rgba(255, 255, 255, 0.3);
    }
    
    .modal-close {
        background: none;
        border: none;
        color: #b0b0b0;
        font-size: 24px;
        cursor: pointer;
        padding: 5px;
        border-radius: 50%;
        width: 40px;
        height: 40px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .modal-content {
        padding: 20px;
    }
    
    .tab-content {
        display: none;
    }
    
    .tab-content.active {
        display: block;
    }
    
    .mobile-gallery {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 12px;
        margin-top: 15px;
    }
    
    .mobile-gallery .gallery-image {
        width: 80px;
        height: 80px;
        cursor: pointer;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    .header-inputs {
        flex-direction: column;
        gap: 15px;
    }
    
    .input-group input {
        min-width: 200px;
        font-size: 14px;
    }
    
    .bingo-cell {
        padding: 10px;
        font-size: 12px;
        min-height: 60px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
        margin: 5px;
    }
    
    .controls {
        display: flex;
        flex-direction: column;
        gap: 10px;
        align-items: center;
    }
    
    .controls .btn {
        width: 200px;
        margin: 0;
    }
    
    /* Mobile modal specific styling */
    .mobile-modal .sidebar-section {
        margin-bottom: 15px;
        padding-bottom: 15px;
    }
    
    .mobile-modal .sidebar-section h4 {
        font-size: 16px;
        margin-bottom: 12px;
    }
    
    .mobile-modal .btn {
        width: 100%;
        margin-bottom: 8px;
    }
}

/* Sidebar Styles */
.sidebar {
    width: 300px;
    background: rgba(42, 42, 42, 0.95);
    backdrop-filter: blur(10px);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px;
    overflow-y: auto;
    transition: transform 0.3s ease;
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    z-index: 1000;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.3);
    color: #e0e0e0;
}

.sidebar.hidden {
    transform: translateX(100%);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h3 {
    color: #e0e0e0;
    font-weight: 700;
    margin: 0;
}

.sidebar-toggle {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #b0b0b0;
    padding: 5px;
    border-radius: 3px;
    transition: all 0.2s ease;
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
}

.options-btn {
    background: rgba(42, 42, 42, 0.9);
    color: #e0e0e0;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    text-align: center;
    display: inline-block;
    text-decoration: none;
}

.options-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.sidebar-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-section .btn {
    margin-bottom: 10px;
}

.sidebar-section .btn:last-child {
    margin-bottom: 0;
}

.sidebar-section:last-child {
    border-bottom: none;
}

.sidebar-section h4 {
    color: #e0e0e0;
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 18px;
}

.color-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 8px;
    margin-bottom: 15px;
}

.color-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.color-control label {
    font-size: 12px;
    color: #e0e0e0;
    text-align: center;
    font-weight: 500;
}

.color-control input[type="color"] {
    width: 35px;
    height: 35px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    cursor: pointer;
    background: none;
    padding: 0;
}

.color-control input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
    border-radius: 50%;
}

.color-control input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 50%;
}

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

.color-group label {
    font-size: 14px;
    color: #b0b0b0;
    font-weight: 500;
}

.color-group input[type="color"] {
    width: 40px;
    height: 30px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
    margin: 5px 0;
    width: 100%;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 8px;
    margin-top: 10px;
    max-height: 200px;
    overflow-y: auto;
}

.gallery-image {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: 5px;
    cursor: grab;
    border: 2px solid transparent;
    transition: all 0.2s ease;
}

.gallery-image:hover {
    border-color: #4D8196;
    transform: scale(1.05);
}

.gallery-image:active {
    cursor: grabbing;
}

.session-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.session-controls select {
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 5px;
    font-size: 14px;
    margin-top: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
}

.main-content.sidebar-open {
    margin-right: 300px;
}

/* Print styles for better export quality */
@media print {
    body {
        background: white;
    }
    
    .container {
        max-width: none;
    }
    
    .controls, footer, .sidebar {
        display: none;
    }
    
    .bingo-container {
        box-shadow: none;
        border: 2px solid #333;
    }
    
    .main-content {
        margin-left: 0;
    }
}