/* ==========================================================================
   Design System & Global Variables
   ========================================================================== */
:root {
    --bg-primary: #f8fafc;
    --bg-card: #ffffff;
    --bg-video: #0f172a;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-light: #eeebff;
    
    --border-color: #e2e8f0;
    --border-focus: #818cf8;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 20px 40px -15px rgba(79, 70, 229, 0.08), 0 15px 15px -10px rgba(0, 0, 0, 0.02);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ==========================================================================
   Global Reset & Scrollbars
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem;
    overflow-x: hidden;
    line-height: 1.5;
}

#app {
    width: 100%;
    max-width: 960px;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ==========================================================================
   Card Layouts
   ========================================================================== */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    width: 100%;
    max-width: 600px;
    display: none;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.card.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
    animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ==========================================================================
   Typography & Subheadings
   ========================================================================== */
.title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #1e1b4b 0%, #4f46e5 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 2rem;
}

/* ==========================================================================
   Form Controls
   ========================================================================== */
.form-group {
    margin-bottom: 1.5rem;
    width: 100%;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.8rem 1rem;
    font-size: 1rem;
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* ==========================================================================
   Consent Agreement Styles
   ========================================================================== */
.consent-container {
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 2rem;
}

.consent-container h2 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.consent-text {
    font-size: 0.825rem;
    color: var(--text-secondary);
    max-height: 180px;
    overflow-y: auto;
    padding-right: 0.5rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    line-height: 1.6;
}

.consent-text ul {
    list-style-type: none;
    margin-top: 0.5rem;
}

.consent-text li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
}

.consent-text li::before {
    content: "•";
    color: var(--color-primary);
    font-size: 1.2rem;
    position: absolute;
    left: 0.25rem;
    top: -0.1rem;
}

.checkbox-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
    margin-top: 0.5rem;
}

.checkbox-wrapper input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid var(--text-muted);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
    margin-top: 0.15rem;
}

.checkbox-wrapper input[type="checkbox"]:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-wrapper input[type="checkbox"]:checked::before {
    content: "✓";
    color: white;
    font-size: 11px;
    font-weight: bold;
}

.checkbox-wrapper label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.4;
    cursor: pointer;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    display: block;
    width: 100%;
    padding: 0.9rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: #ffffff;
    background-color: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.btn:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    transform: translateY(-1px);
}

.btn:active:not(:disabled) {
    transform: translateY(1px);
}

.btn:disabled {
    background-color: var(--text-muted);
    opacity: 0.6;
    cursor: not-allowed;
    box-shadow: none;
}

/* ==========================================================================
   Workspace View (Split Panel)
   ========================================================================== */
.workspace {
    display: none;
    opacity: 0;
    flex-direction: column;
    width: 100%;
    animation: fadeIn 0.4s ease forwards;
}

.workspace.active {
    display: flex;
    opacity: 1;
}

/* Workspace Header */
.eval-header {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: var(--shadow-md);
}

.progress-container {
    width: 100%;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

#progress-bar-inner {
    height: 100%;
    background: linear-gradient(90deg, #6366f1 0%, #4f46e5 100%);
    border-radius: var(--radius-full);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.badge-container {
    display: flex;
    gap: 0.75rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
}

.badge-accent {
    background-color: var(--color-primary-light);
    border-color: #c7d2fe;
    color: var(--color-primary);
}

/* Workspace Body Layout */
.eval-body {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 1.5rem;
    align-items: start;
}

@media (max-width: 768px) {
    .eval-body {
        grid-template-columns: 1fr;
    }
}

/* Video Panel */
.video-panel {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1rem;
    overflow: hidden;
}

.video-wrapper {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--bg-video);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 0 40px rgba(0,0,0,0.5);
}

#eval-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.video-overlay-controls {
    position: absolute;
    bottom: 12px;
    right: 12px;
    z-index: 10;
}

.control-btn {
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.control-btn:hover {
    background-color: rgba(15, 23, 42, 0.85);
    transform: scale(1.05);
}

.control-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* Loading Spinner overlay */
.spinner-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 5;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast) ease;
}

.spinner-container.active {
    opacity: 1;
    pointer-events: auto;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--color-primary);
    animation: spin 0.8s linear infinite;
}

/* Control Panel & Ratings */
.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.score-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
}

.score-card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.score-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.rating-scale-4 {
    display: flex;
    flex-direction: row;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.grade-btn-4 {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.25rem 0.5rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    background-color: var(--bg-primary);
    text-align: center;
    transition: transform var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
    gap: 0.6rem;
}

.grade-btn-4 .shortcut-badge {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--text-primary);
    transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.grade-btn-4 .label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

/* Custom Soft Pastel Gradients for 4-scale Ratings */

/* Real: Green */
.grade-btn-4.real:hover, .grade-btn-4.real.selected {
    border-color: #86efac;
    background-color: #f0fdf4;
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.06);
}
.grade-btn-4.real:hover .shortcut-badge, .grade-btn-4.real.selected .shortcut-badge {
    background-color: #22c55e;
    color: #ffffff;
    border-color: #22c55e;
}
.grade-btn-4.real:hover .label, .grade-btn-4.real.selected .label {
    color: #166534;
}

/* Probably Real: Light Green/Teal */
.grade-btn-4.probably_real:hover, .grade-btn-4.probably_real.selected {
    border-color: #a7f3d0;
    background-color: #f0fdf9;
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.06);
}
.grade-btn-4.probably_real:hover .shortcut-badge, .grade-btn-4.probably_real.selected .shortcut-badge {
    background-color: #059669;
    color: #ffffff;
    border-color: #059669;
}
.grade-btn-4.probably_real:hover .label, .grade-btn-4.probably_real.selected .label {
    color: #065f46;
}

/* Probably Fake: Orange */
.grade-btn-4.probably_fake:hover, .grade-btn-4.probably_fake.selected {
    border-color: #fed7aa;
    background-color: #fff7ed;
    box-shadow: 0 4px 12px rgba(234, 88, 12, 0.06);
}
.grade-btn-4.probably_fake:hover .shortcut-badge, .grade-btn-4.probably_fake.selected .shortcut-badge {
    background-color: #ea580c;
    color: #ffffff;
    border-color: #ea580c;
}
.grade-btn-4.probably_fake:hover .label, .grade-btn-4.probably_fake.selected .label {
    color: #9a3412;
}

/* Fake: Red */
.grade-btn-4.fake:hover, .grade-btn-4.fake.selected {
    border-color: #fecdd3;
    background-color: #fff5f5;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.06);
}
.grade-btn-4.fake:hover .shortcut-badge, .grade-btn-4.fake.selected .shortcut-badge {
    background-color: #dc2626;
    color: #ffffff;
    border-color: #dc2626;
}
.grade-btn-4.fake:hover .label, .grade-btn-4.fake.selected .label {
    color: #991b1b;
}

/* Scale pop effect on click */
.grade-btn-4:active {
    transform: scale(0.97);
}

.hotkey-tip {
    font-size: 0.775rem;
    color: var(--text-secondary);
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
    margin-top: 0.5rem;
}

/* ==========================================================================
   Completion Screen
   ========================================================================== */
.success-icon-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.success-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    background-color: #dcfce7;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #15803d;
}

.success-icon svg {
    width: 36px;
    height: 36px;
    fill: currentColor;
}

.summary-container {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    padding: 1.25rem;
    margin-bottom: 2rem;
    width: 100%;
}

.summary-container h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.summary-table-wrapper {
    max-height: 240px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-card);
}

.summary-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    text-align: left;
}

.summary-table th, 
.summary-table td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.summary-table th {
    background-color: var(--bg-primary);
    font-weight: 700;
    color: var(--text-secondary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.summary-table tbody tr:last-child td {
    border-bottom: none;
}

/* Helper Utilities */
.hidden {
    display: none !important;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes spin {
    to { transform: rotate(360deg); }
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}