/**
 * PDF Translator Enhanced Styles
 * Modern M3 Expressive Design with animations
 */

/* Language Selector Enhancements */
.language-selector-container {
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.language-grid {
    position: relative;
}

.language-select {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.language-select:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
}

/* Language Swap Button */
.swap-languages-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

.swap-languages-btn:hover {
    transform: translate(-50%, -50%) rotate(180deg) scale(1.1);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.swap-languages-btn:active {
    transform: translate(-50%, -50%) rotate(180deg) scale(0.95);
}

/* Advanced Options Panel */
.advanced-options {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 0;
    margin-top: 1.5rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.advanced-options-header {
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.advanced-options-header:hover {
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
}

.advanced-options-content {
    padding: 1.25rem;
    display: none;
    animation: slideDown 0.3s ease;
}

.advanced-options.expanded .advanced-options-content {
    display: block;
}

.advanced-options.expanded .chevron-icon {
    transform: rotate(180deg);
}

.chevron-icon {
    transition: transform 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Option Group */
.option-group {
    margin-bottom: 1.25rem;
}

.option-group:last-child {
    margin-bottom: 0;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: #334155;
    margin-bottom: 0.5rem;
}

.option-description {
    font-size: 0.85rem;
    color: #64748b;
    margin-top: 0.25rem;
    line-height: 1.5;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #cbd5e1;
    transition: 0.3s;
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input:checked+.toggle-slider {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

input:checked+.toggle-slider:before {
    transform: translateX(22px);
}

/* Progress Enhancements */
.progress-detail {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #64748b;
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
}

.progress-stat {
    text-align: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.progress-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    display: block;
}

.progress-stat-label {
    font-size: 0.85rem;
    color: #64748b;
    margin-top: 0.25rem;
}

/* Translation Comparison View */
.translation-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

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

/* Text Panel Enhancements */
.text-panel {
    position: relative;
    overflow: hidden;
}

.text-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.text-panel:hover::before {
    transform: scaleX(1);
}

.text-panel-content {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    scrollbar-width: thin;
    scrollbar-color: #cbd5e1 #f1f5f9;
}

.text-panel-content::-webkit-scrollbar {
    width: 8px;
}

.text-panel-content::-webkit-scrollbar-track {
    background: #f1f5f9;
}

.text-panel-content::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.text-panel-content::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.btn-action {
    flex: 1;
    min-width: 200px;
}

/* Language Detection Badge */
.language-detected {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 1rem;
    animation: fadeInSlide 0.4s ease;
}

@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Translation History */
.translation-history {
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 1.25rem;
    margin-top: 1.5rem;
}

.history-item {
    padding: 1rem;
    border-bottom: 1px solid #f1f5f9;
    cursor: pointer;
    transition: background 0.2s ease;
}

.history-item:last-child {
    border-bottom: none;
}

.history-item:hover {
    background: #f8fafc;
}

.history-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.history-languages {
    font-size: 0.85rem;
    font-weight: 600;
    color: #334155;
}

.history-time {
    font-size: 0.75rem;
    color: #94a3b8;
}

.history-preview {
    font-size: 0.85rem;
    color: #64748b;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Mobile Optimizations */
@media (max-width: 600px) {
    .language-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .swap-languages-btn {
        position: static;
        transform: rotate(90deg);
        margin: 0.5rem auto;
    }

    .swap-languages-btn:hover {
        transform: rotate(270deg) scale(1.1);
    }

    .progress-stats {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn-action {
        width: 100%;
    }
}

/* Touch-friendly swipe indicator */
.swipe-indicator {
    display: none;
    text-align: center;
    padding: 0.75rem;
    background: linear-gradient(135deg, #f8fafc, #f1f5f9);
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: #64748b;
}

@media (max-width: 768px) and (hover: none) {
    .swipe-indicator {
        display: block;
    }
}

/* Accessibility Enhancements */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible styles */
button:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Loading skeleton */
.skeleton {
    background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
    background-size: 200% 100%;
    animation: loading 1.5s ease-in-out infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* Error states */
.error-message {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    display: flex;
    align-items: start;
    gap: 0.75rem;
}

.error-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* Success states */
.success-message {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    display: flex;
    align-items: start;
    gap: 0.75rem;
}