/* Global Styles with performance optimizations and browser compatibility */
* {
    margin: 0;
    padding: 0;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

/* Use will-change for animated elements with performance optimization */
.video-option,
.score-card,
.btn,
.bar-fill,
.metric-card,
.agreement-level,
.consistency-index {
    will-change: transform;
    transform: translateZ(0); /* Force hardware acceleration */
    backface-visibility: hidden; /* Prevent flickering */
}

/* Optimize font loading with browser compatibility */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f0f9ff; /* Fallback */
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%); /* Light blue-white theme */
    min-height: 100vh;
    color: #1f2937;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Load Inter font when available */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 300 800;
    font-display: swap;
    src: url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
}

/* Fallback for when Inter loads */
.font-loaded body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 60px;
    color: #1f2937;
    padding: 20px 0;
}

.logo {
    margin-bottom: 20px;
}

.logo h1 {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: 5px;
    background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%); /* Sky blue to Blue */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
    filter: drop-shadow(0 2px 4px rgba(14, 165, 233, 0.1));
}

.logo-subtitle {
    font-size: 1.2rem;
    font-weight: 500;
    opacity: 0.8;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: #64748b;
}

.subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 35px;
    color: #475569;
}

.help-tips {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.tip {
    background: white;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    color: #64748b;
    font-weight: 500;
}

.tip:hover {
    background: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.06);
    color: #334155;
}

.tip i {
    color: #0ea5e9;
    font-size: 1rem;
}

/* Upload Section */
.upload-section {
    margin-bottom: 60px;
}

.upload-dropzone {
    background: white;
    border: 3px dashed #cbd5e1;
    border-radius: 30px;
    padding: 80px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 20px 40px rgba(0,0,0,0.02);
}

.upload-dropzone:hover {
    border-color: #0ea5e9;
    background: #f0f9ff;
    transform: translateY(-5px);
    box-shadow: 0 25px 50px rgba(14, 165, 233, 0.1);
}

.upload-dropzone.dragover {
    border-color: #0ea5e9;
    background: #e0f2fe;
    transform: scale(1.01);
}

.upload-content i {
    font-size: 4.5rem;
    background: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 25px;
}

.upload-content h3 {
    font-size: 1.8rem;
    color: #1e293b;
    margin-bottom: 12px;
    font-weight: 700;
}

.upload-content p {
    color: #64748b;
    margin-bottom: 25px;
    font-size: 1.1rem;
}

/* Sequence Display */
.sequence-container {
    margin-bottom: 60px;
}

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

.sequence-header h2 {
    font-size: 2rem;
    color: #1e293b;
    font-weight: 800;
    margin-bottom: 10px;
}

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

.sequence-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.sequence-item {
    background: white;
    padding: 15px;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.04);
    position: relative;
    cursor: move;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid #f1f5f9;
}

.sequence-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    z-index: 10;
}

.sequence-item.dragging {
    opacity: 0.6;
    transform: scale(0.95);
    box-shadow: none;
}

.sequence-item img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    border-radius: 16px;
    display: block;
}

.sequence-number {
    position: absolute;
    top: -12px;
    left: -12px;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    z-index: 2;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

.sequence-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.sequence-item:hover .sequence-controls {
    opacity: 1;
}

.btn-icon {
    background: rgba(255, 255, 255, 0.95);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    color: #ef4444;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.btn-icon:hover {
    background: #ef4444;
    color: white;
    transform: scale(1.1);
}

/* Scoring Criteria Section */
.criteria-section {
    background: white;
    border-radius: 30px;
    padding: 60px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.03);
    margin-bottom: 60px;
    border: 1px solid #f1f5f9;
}

.criteria-section h2 {
    color: #1e293b;
    margin-bottom: 50px;
    font-size: 2.4rem;
    text-align: center;
    font-weight: 800;
}

.criteria-section h2 i {
    margin-right: 15px;
    color: #0ea5e9;
}

.criteria-grid {
    display: grid;
    grid-template-columns: 1fr; /* Full width for detailed rubrics */
    gap: 40px;
    margin-bottom: 50px;
}

.criteria-card {
    background: #f8fafc;
    border-radius: 24px;
    padding: 40px;
    border-left: 8px solid #0ea5e9;
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.criteria-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(14, 165, 233, 0.08);
    background: #ffffff;
}

.criteria-card h3 {
    color: #1e293b;
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.criteria-card h3 i {
    margin-right: 15px;
    color: #0ea5e9;
    background: #e0f2fe;
    padding: 12px;
    border-radius: 12px;
    font-size: 1.2rem;
}

.criteria-card p {
    color: #64748b;
    margin-bottom: 30px;
    font-size: 1.1rem;
    line-height: 1.6;
    padding-left: 60px; /* Indent description to align with title text */
}

.sub-criteria {
    display: grid;
    gap: 25px;
}

.sub-criterion {
    background: white;
    padding: 30px;
    border-radius: 20px;
    border: 1px solid #f1f5f9;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.sub-criterion:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border-color: #e2e8f0;
}

.sub-criterion h4 {
    color: #0f172a;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 10px;
}

.sub-criterion p {
    color: #475569;
    font-size: 1.05rem;
    margin: 0 0 20px 0;
    line-height: 1.6;
    padding-left: 0;
}

/* Rubric List Styles */
.rubric-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

.rubric-list li {
    font-size: 0.95rem;
    color: #64748b;
    margin-bottom: 10px;
    line-height: 1.5;
    padding-left: 15px;
    border-left: 3px solid #e2e8f0;
    position: relative;
    transition: border-color 0.2s ease;
}

.rubric-list li:hover {
    border-left-color: #0ea5e9;
    color: #334155;
}

.rubric-list li:last-child {
    margin-bottom: 0;
}

.rubric-list li strong {
    color: #0f172a;
    font-weight: 700;
    display: inline-block;
    margin-right: 8px;
    min-width: 100px;
}

.criteria-actions, .scoring-actions {
    text-align: center;
    margin: 40px 0;
}

/* Scoring Section */
.scoring-section {
    background: white;
    border-radius: 30px;
    padding: 60px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.03);
    margin-bottom: 60px;
    border: 1px solid #f1f5f9;
}

.scoring-section h2 {
    color: #1e293b;
    margin-bottom: 50px;
    font-size: 2.4rem;
    text-align: center;
    font-weight: 800;
}

.scoring-section h2 i {
    margin-right: 15px;
    color: #0ea5e9;
}

/* Score Cards */
.score-card {
    background: #ffffff;
    border-radius: 24px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.score-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: linear-gradient(to bottom, #0ea5e9, #2563eb);
}

.score-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px rgba(14, 165, 233, 0.1);
}

.score-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 35px;
    padding-bottom: 20px;
    border-bottom: 1px solid #f1f5f9;
}

.score-header h3 {
    color: #1e293b;
    font-size: 1.6rem;
    font-weight: 800;
    display: flex;
    align-items: center;
}

.score-header h3 i {
    margin-right: 15px;
    color: #0ea5e9;
    background: #e0f2fe;
    padding: 10px;
    border-radius: 12px;
}

.score-value {
    background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    color: white;
    padding: 12px 28px;
    border-radius: 16px;
    font-weight: 800;
    font-size: 1.5rem;
    min-width: 90px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(14, 165, 233, 0.25);
}

/* Sub Scores */
.sub-score-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.sub-score {
    padding: 25px;
    background: #f8fafc;
    border-radius: 20px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.sub-score:hover {
    background: white;
    border-color: #0ea5e9;
    box-shadow: 0 10px 30px rgba(14, 165, 233, 0.08);
    transform: translateY(-2px);
}

.sub-score label {
    display: block;
    font-weight: 700;
    color: #334155;
    margin-bottom: 18px;
    font-size: 1.1rem;
}

.sub-score-control {
    display: flex;
    align-items: center;
    gap: 25px;
}

.sub-score-control input[type="range"] {
    flex: 1;
    height: 10px;
    background: #e2e8f0;
    border-radius: 10px;
    appearance: none;
    outline: none;
    cursor: pointer;
}

.sub-score-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: white;
    border: 2px solid #0ea5e9;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(14, 165, 233, 0.2);
    transition: all 0.2s ease;
    margin-top: -9px; /* Align center vertically */
}

/* Chrome/Safari/Opera specific */
.sub-score-control input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 10px;
    background: #e2e8f0;
    border-radius: 10px;
}

.sub-score-control input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 6px 15px rgba(14, 165, 233, 0.3);
    background: #0ea5e9;
    border-color: white;
}

.sub-score-value {
    background: white;
    color: #0ea5e9;
    padding: 8px 16px;
    border-radius: 12px;
    font-weight: 700;
    min-width: 60px;
    text-align: center;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border: 1px solid #e2e8f0;
}

/* Total Score Display */
.total-score {
    background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    color: white;
    border-radius: 30px;
    padding: 50px;
    text-align: center;
    margin-bottom: 50px;
    box-shadow: 0 30px 60px rgba(14, 165, 233, 0.25);
    position: relative;
    overflow: hidden;
}

.total-score::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    pointer-events: none;
}

.total-score h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    font-weight: 800;
    position: relative;
    z-index: 1;
}

.total-score h3 i {
    margin-right: 15px;
    color: #fcd34d; /* Gold/Yellow */
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.total-score-value {
    font-size: 6rem;
    font-weight: 900;
    margin-bottom: 40px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.15);
    position: relative;
    z-index: 1;
    line-height: 1;
}

.score-breakdown {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.breakdown-item {
    background: rgba(255,255,255,0.15);
    padding: 15px 30px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    border: 1px solid rgba(255,255,255,0.3);
    font-size: 1.1rem;
    backdrop-filter: none; /* Removed blur */
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

/* AI Comparison Section */
.ai-comparison-section {
    background: white;
    border-radius: 30px;
    padding: 50px;
    margin-bottom: 50px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.03);
    border: 1px solid #f1f5f9;
}

.ai-comparison-section h3 {
    color: #1e293b;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 40px;
    text-align: center;
}

.ai-comparison-section h3 i {
    margin-right: 15px;
    color: #0ea5e9;
}

/* Quick Input Section */
.quick-input-section {
    background: #f8fafc;
    border-radius: 24px;
    padding: 40px;
    margin-bottom: 40px;
    border: 1px solid #e2e8f0;
}

.input-description {
    color: #64748b;
    margin-bottom: 30px;
    font-size: 1.1rem;
    text-align: center;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.input-item label {
    font-weight: 700;
    color: #334155;
    font-size: 1rem;
    margin-bottom: 10px;
    display: block;
}

.input-item input[type="number"] {
    padding: 18px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 16px;
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    background: white;
    color: #1e293b;
    width: 100%;
}

.input-item input[type="number"]:focus {
    outline: none;
    border-color: #0ea5e9;
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.15);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 25px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 50px;
}

.btn {
    padding: 18px 36px;
    border: none;
    border-radius: 20px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
    color: white;
    box-shadow: 0 10px 25px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
    background: white;
    color: #475569;
    border: 2px solid #e2e8f0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
}

.btn-secondary:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
    transform: translateY(-3px);
    color: #1e293b;
    box-shadow: 0 10px 25px rgba(0,0,0,0.06);
}

.btn-ai {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.3);
}

.btn-ai:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(239, 68, 68, 0.4);
}

/* History Section */
.history-section {
    background: white;
    border-radius: 30px;
    padding: 50px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.03);
    margin-bottom: 60px;
    border: 1px solid #f1f5f9;
}

.history-section h2 {
    color: #1e293b;
    margin-bottom: 40px;
    font-size: 2rem;
    text-align: center;
    font-weight: 800;
}

.history-section h2 i {
    margin-right: 15px;
    color: #0ea5e9;
}

.history-item {
    background: #ffffff;
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 25px;
    border: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 25px;
    transition: all 0.3s ease;
}

.history-item:hover {
    transform: translateX(5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border-color: #0ea5e9;
}

.history-item-info {
    flex: 1;
    min-width: 200px;
}

.history-item-title {
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 8px;
    font-size: 1.2rem;
}

.history-item-date {
    color: #64748b;
    font-size: 0.95rem;
}

.history-item-scores {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.history-score {
    background: #f0f9ff;
    color: #0ea5e9;
    padding: 10px 20px;
    border-radius: 14px;
    font-size: 0.95rem;
    font-weight: 700;
    border: 1px solid #bae6fd;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 20px;
    }
}

@media (max-width: 768px) {
    .logo h1 {
        font-size: 3.5rem;
    }
    
    .scoring-section,
    .criteria-section {
        padding: 30px;
    }
    
    .score-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    .score-value {
        width: 100%;
        text-align: center;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .history-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .history-item-scores {
        width: 100%;
    }
    
    .sequence-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .sequence-grid {
        grid-template-columns: 1fr;
    }
    
    .total-score-value {
        font-size: 4rem;
    }
    
    .sub-score-control {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    
    .sub-score-value {
        align-self: center;
    }
}

/* Animation Effects */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.scoring-section,
.history-section,
.criteria-section,
.sequence-container,
.upload-section {
    animation: fadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
button:focus,
input:focus {
    outline: 3px solid rgba(14, 165, 233, 0.5);
    outline-offset: 2px;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 6px;
    border: 3px solid #f1f5f9;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}