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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    overflow: hidden;
    height: 100vh;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

/* Main Container */
.main-container {
    display: flex;
    height: 100vh;
    background: #f8fafc;
}

/* Sidebar */
.sidebar {
    width: 350px;
    background: white;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

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

.sidebar-header {
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.toggle-btn {
    background: none;
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: background 0.2s;
}

.toggle-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

/* Search Container */
.search-container {
    margin-bottom: 20px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 12px;
    color: #64748b;
    z-index: 1;
}

.search-box input {
    width: 100%;
    padding: 12px 12px 12px 40px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    background: white;
    transition: all 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    margin-bottom: 20px;
    background: #f1f5f9;
    border-radius: 8px;
    padding: 4px;
}

.filter-tab {
    flex: 1;
    padding: 8px 12px;
    border: none;
    background: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    color: #64748b;
}

.filter-tab.active {
    background: white;
    color: #667eea;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Presentation List */
.presentation-list {
    space-y: 12px;
}

.presentation-item {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 12px;
    position: relative;
    overflow: hidden;
}

.presentation-item:hover {
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.15);
}

.presentation-item.soon {
    border-color: #f59e0b;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.presentation-item.open {
    border-color: #10b981;
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

.presentation-item.private {
    border-color: #8b5cf6;
    background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
}

.presentation-title {
    font-size: 16px;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 8px;
}

.presentation-description {
    font-size: 14px;
    color: #6b7280;
    margin-bottom: 12px;
    line-height: 1.4;
}

.presentation-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.presentation-status {
    padding: 4px 8px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
}

.presentation-status.open {
    background: #10b981;
    color: white;
}

.presentation-status.soon {
    background: #f59e0b;
    color: white;
}

.presentation-status.private {
    background: #8b5cf6;
    color: white;
}

.presentation-date {
    font-size: 12px;
    color: #9ca3af;
}

/* Presentation Area */
.presentation-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
    position: relative;
}

.presentation-header {
    background: white;
    padding: 20px 30px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Progress Bar */
.progress-container {
    background: white;
    padding: 15px 30px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    gap: 15px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    font-size: 14px;
    font-weight: 500;
    color: #64748b;
    min-width: 40px;
    text-align: right;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.menu-btn {
    background: none;
    border: none;
    font-size: 18px;
    color: #64748b;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s;
}

.menu-btn:hover {
    background: #f1f5f9;
    color: #667eea;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-menu {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    color: #64748b;
    font-weight: 500;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.2s;
}

.user-menu:hover {
    background: #f1f5f9;
    color: #667eea;
}

.user-menu i {
    font-size: 24px;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 8px 0;
    min-width: 150px;
    display: none;
    z-index: 1000;
}

.user-menu:hover .user-dropdown {
    display: block;
}

.user-dropdown a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    color: #374151;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.2s;
}

.user-dropdown a:hover {
    background: #f1f5f9;
    color: #667eea;
}

.auth-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

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

.slide-counter {
    background: #f1f5f9;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: #64748b;
}

.presentation-controls {
    display: flex;
    gap: 8px;
}

.control-btn {
    background: #667eea;
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.control-btn:hover:not(:disabled) {
    background: #5a67d8;
    transform: translateY(-1px);
}

.control-btn:disabled {
    background: #e2e8f0;
    color: #9ca3af;
    cursor: not-allowed;
}

/* Presentation Content */
.presentation-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
    position: relative;
}

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

.welcome-screen {
    text-align: center;
    color: #64748b;
}

.welcome-content i {
    font-size: 64px;
    color: #667eea;
    margin-bottom: 20px;
}

.welcome-content h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #1f2937;
}

.welcome-content p {
    font-size: 16px;
    margin-bottom: 30px;
}

.welcome-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.welcome-actions .btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.welcome-actions .btn-primary:hover {
    background: #5a67d8;
    transform: translateY(-1px);
}

.welcome-actions .btn-secondary {
    background: #e2e8f0;
    color: #64748b;
}

.welcome-actions .btn-secondary:hover {
    background: #cbd5e1;
}

/* Slide Content */
.slide-content {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 900px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.slide-content h1 {
    font-size: 32px;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 20px;
    text-align: center;
}

.slide-content h2 {
    font-size: 24px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 16px;
}

.slide-content p {
    font-size: 16px;
    line-height: 1.6;
    color: #4b5563;
    margin-bottom: 16px;
}

.slide-content ul, .slide-content ol {
    margin-left: 20px;
    margin-bottom: 16px;
}

.slide-content li {
    font-size: 16px;
    line-height: 1.6;
    color: #4b5563;
    margin-bottom: 8px;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 30px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: #1f2937;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    color: #9ca3af;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: all 0.2s;
}

.close-btn:hover {
    color: #ef4444;
    background: #fef2f2;
}

.modal-body {
    padding: 30px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #374151;
    margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* File Upload */
.file-upload {
    position: relative;
}

.file-upload input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-upload-area {
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    transition: all 0.2s;
    background: #f8fafc;
}

.file-upload-area:hover {
    border-color: #667eea;
    background: #f1f5ff;
}

.file-upload-area i {
    font-size: 32px;
    color: #667eea;
    margin-bottom: 10px;
}

.file-upload-area p {
    font-size: 14px;
    color: #64748b;
    margin-bottom: 5px;
}

.file-info {
    font-size: 12px;
    color: #9ca3af;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: #5a67d8;
    transform: translateY(-1px);
}

.btn-secondary {
    background: #e2e8f0;
    color: #64748b;
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 30px;
}

/* Message Container */
.message-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 3000;
}

.message {
    background: white;
    border-radius: 8px;
    padding: 16px 20px;
    margin-bottom: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: messageSlideIn 0.3s ease;
    max-width: 400px;
}

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

.message.success {
    border-left: 4px solid #10b981;
}

.message.error {
    border-left: 4px solid #ef4444;
}

.message i {
    font-size: 18px;
}

.message.success i {
    color: #10b981;
}

.message.error i {
    color: #ef4444;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 1000;
    }
    
    .presentation-header {
        padding: 15px 20px;
    }
    
    .slide-content {
        padding: 20px;
        margin: 20px;
    }
    
    .modal-content {
        width: 95%;
        margin: 20px;
    }
    
    .modal-body {
        padding: 20px;
    }
}

/* Fullscreen Mode */
.presentation-area.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1500;
    background: #000;
}

.presentation-area.fullscreen .presentation-header {
    background: rgba(0, 0, 0, 0.8);
    color: white;
}

.presentation-area.fullscreen .presentation-content {
    background: #000;
}

.presentation-area.fullscreen .slide-content {
    background: white;
    color: #000;
}