/* ================================================
   CONFERENCE SLIDE SYSTEM - GENERIC STYLES
   ================================================ */

:root {
    --slide-bg: #ffffff;
    --slide-text: #1e293b;
    --primary-blue: #1e3a8a;
    --accent-gold: #f59e0b;
    --success-green: #10b981;
    --border-color: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --nav-bg: rgba(30, 58, 138, 0.95);
    --nav-hover: rgba(59, 130, 246, 0.95);
}

/* ================================================
   SLIDE SELECTOR PAGE (index.html)
   ================================================ */

.selector-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.selector-header {
    text-align: center;
    margin-bottom: 3rem;
}

.selector-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.selector-header p {
    font-size: 1.1rem;
    color: #64748b;
}

.selector-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow-light);
    flex-wrap: wrap;
}

.selector-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-selector {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), #3b82f6);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: white;
}

.btn-success {
    background: var(--success-green);
    color: white;
}

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

.selector-info {
    display: flex;
    gap: 2rem;
    align-items: center;
    color: #64748b;
    font-size: 0.95rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-item strong {
    color: var(--primary-blue);
}

/* Slide Grid */
.slides-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.slide-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--shadow-light);
    transition: all 0.3s ease;
    position: relative;
    cursor: pointer;
}

.slide-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.slide-card.selected {
    border: 3px solid var(--success-green);
}

.slide-card.selected::after {
    content: '✓';
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--success-green);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    z-index: 2;
}

.slide-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.slide-thumbnail-content {
    padding: 1rem;
    text-align: center;
}

.slide-thumbnail h3 {
    font-size: 1.1rem;
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.slide-number {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(30, 58, 138, 0.9);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
}

.slide-info {
    padding: 1rem;
}

.slide-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--slide-text);
    margin-bottom: 0.5rem;
}

.slide-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.slide-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.slide-checkbox label {
    cursor: pointer;
    color: #64748b;
    font-size: 0.9rem;
}

/* ================================================
   SLIDE VIEWER PAGE (viewer.html)
   ================================================ */

.viewer-container {
    width: 100vw;
    height: 100vh;
    background: #0f172a;
    position: relative;
    overflow: hidden;
}

.slide-display {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.slide-content {
    width: 90%;
    max-width: 1200px;
    aspect-ratio: 16/9;
    background: var(--slide-bg);
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    padding: 3rem;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Navigation Controls */
.nav-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 2rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 100;
}

.viewer-container:hover .nav-controls {
    opacity: 1;
}

.nav-btn {
    background: transparent;
    border: 2px solid white;
    color: white;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.nav-btn:hover {
    background: var(--nav-hover);
    transform: scale(1.1);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-btn:disabled:hover {
    transform: none;
}

.slide-counter {
    color: white;
    font-weight: 600;
    font-size: 1rem;
    min-width: 80px;
    text-align: center;
}

/* Slide Menu */
.slide-menu {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 1rem;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.3s ease;
    z-index: 100;
    max-height: 80vh;
    overflow-y: auto;
}

.viewer-container:hover .slide-menu {
    opacity: 1;
    transform: translateX(0);
}

.menu-toggle {
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.menu-toggle:hover {
    background: var(--nav-hover);
    transform: scale(1.1);
}

.menu-list {
    margin-top: 1rem;
    display: none;
}

.slide-menu.open .menu-list {
    display: block;
}

.menu-item {
    padding: 0.75rem 1rem;
    color: white;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    width: 100%;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.menu-item:hover {
    background: var(--nav-hover);
}

.menu-item.active {
    background: var(--accent-gold);
    font-weight: 600;
}

/* Exit Button */
.exit-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
}

.viewer-container:hover .exit-btn {
    opacity: 1;
}

.exit-btn:hover {
    background: rgba(220, 38, 38, 0.9);
    transform: scale(1.05);
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */

@media (max-width: 768px) {
    .selector-container {
        padding: 1rem;
    }

    .selector-header h1 {
        font-size: 1.8rem;
    }

    .slides-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }

    .selector-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .selector-actions {
        flex-direction: column;
    }

    .btn-selector {
        width: 100%;
        justify-content: center;
    }

    .slide-content {
        width: 95%;
        padding: 1.5rem;
    }

    .nav-controls {
        padding: 0.75rem 1rem;
        gap: 1rem;
    }

    .slide-menu {
        width: 200px;
    }
}

@media (max-width: 480px) {
    .selector-header h1 {
        font-size: 1.5rem;
    }

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

    .slide-content {
        padding: 1rem;
    }

    .nav-btn {
        width: 40px;
        height: 40px;
    }
}

/* ================================================
   UTILITY CLASSES
   ================================================ */

.hidden {
    display: none !important;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }