/**
 * TextDiff Ninja - Light Grey Theme with Neon Blue Accents
 * Fully Responsive Design
 */

/* CSS Custom Properties */
:root {
    --tdn-bg: #F5F5F5;
    --tdn-bg-alt: #EAEAEA;
    --tdn-white: #FFFFFF;
    --tdn-header-bg: #00E5FF;
    --tdn-header-glow: rgba(0, 229, 255, 0.3);
    --tdn-btn-primary: #00E5FF;
    --tdn-btn-hover: #1AECFF;
    --tdn-btn-glow: rgba(0, 229, 255, 0.4);
    --tdn-text-dark: #1A1A2E;
    --tdn-text: #333333;
    --tdn-text-light: #666666;
    --tdn-border: #DDDDDD;
    --tdn-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    --tdn-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --tdn-radius: 12px;
    --tdn-radius-sm: 8px;
    --tdn-transition: all 0.25s ease-in-out;
    --tdn-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    
    /* Diff colors */
    --tdn-add-bg: #d4edda;
    --tdn-add-text: #155724;
    --tdn-remove-bg: #f8d7da;
    --tdn-remove-text: #721c24;
}

/* Reset & Base */
.tdn-wrapper {
    font-family: var(--tdn-font);
    background: linear-gradient(180deg, var(--tdn-bg) 0%, var(--tdn-bg-alt) 100%);
    border-radius: var(--tdn-radius);
    box-shadow: var(--tdn-shadow-lg);
    max-width: 100%;
    margin: 20px auto;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.tdn-wrapper * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Header Bar */
.tdn-header {
    background: var(--tdn-header-bg);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px var(--tdn-header-glow);
    position: sticky;
    top: 0;
    z-index: 100;
    width: 100%;
}

.tdn-header-title {
    color: var(--tdn-text-dark);
    font-size: clamp(18px, 3vw, 22px);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-align: center;
}

/* Toolbar */
.tdn-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    gap: 12px;
    flex-wrap: wrap;
    background: var(--tdn-white);
    border-bottom: 1px solid var(--tdn-border);
}

.tdn-toolbar-left,
.tdn-toolbar-right {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tdn-toolbar-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

/* View Toggle */
.tdn-view-toggle {
    display: flex;
    background: var(--tdn-bg);
    border-radius: var(--tdn-radius-sm);
    padding: 3px;
    gap: 2px;
}

.tdn-view-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--tdn-text);
    cursor: pointer;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    transition: var(--tdn-transition);
    white-space: nowrap;
}

.tdn-view-btn.active {
    background: var(--tdn-white);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    color: var(--tdn-text-dark);
}

.tdn-view-btn:hover:not(.active) {
    background: rgba(0,0,0,0.03);
}

/* Buttons */
.tdn-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--tdn-radius-sm);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: var(--tdn-transition);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.tdn-btn-compare {
    background: var(--tdn-btn-primary);
    color: var(--tdn-text-dark);
}

.tdn-btn-compare:hover {
    background: var(--tdn-btn-hover);
    box-shadow: 0 4px 15px var(--tdn-btn-glow);
    transform: translateY(-1px);
}

.tdn-btn-compare:active {
    transform: translateY(0);
}

.tdn-btn-outline {
    background: transparent;
    border: 2px solid var(--tdn-btn-primary);
    color: var(--tdn-text-dark);
}

.tdn-btn-outline:hover {
    background: rgba(0, 229, 255, 0.1);
    border-color: var(--tdn-btn-hover);
}

.tdn-btn-download {
    background: transparent;
    border: 2px solid var(--tdn-btn-primary);
    color: var(--tdn-text-dark);
    animation: pulse-border 2s infinite;
}

.tdn-btn-download:hover {
    background: var(--tdn-btn-primary);
    color: var(--tdn-text-dark);
    animation: none;
}

@keyframes pulse-border {
    0%, 100% { border-color: var(--tdn-btn-primary); }
    50% { border-color: rgba(0, 229, 255, 0.3); }
}

/* Options Bar */
.tdn-options {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 16px;
    flex-wrap: wrap;
    background: var(--tdn-white);
    border-bottom: 1px solid var(--tdn-border);
    font-size: 13px;
}

.tdn-checkbox {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    color: var(--tdn-text);
    font-size: 13px;
    user-select: none;
}

.tdn-checkbox input[type="checkbox"] {
    accent-color: var(--tdn-btn-primary);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.tdn-granularity {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.tdn-granularity label {
    color: var(--tdn-text);
    font-size: 13px;
}

.tdn-granularity select {
    padding: 6px 12px;
    border: 1px solid var(--tdn-border);
    border-radius: 6px;
    background: var(--tdn-white);
    font-size: 13px;
    color: var(--tdn-text);
    cursor: pointer;
}

.tdn-file-upload input[type="file"] {
    display: none;
}

.tdn-file-label {
    cursor: pointer;
    font-size: 12px !important;
    padding: 8px 14px !important;
}

/* Input Container */
.tdn-input-container {
    display: flex;
    gap: 1px;
    background: var(--tdn-border);
    min-height: 300px;
}

.tdn-input-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--tdn-white);
    position: relative;
}

.tdn-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: #FAFAFA;
    border-bottom: 1px solid var(--tdn-border);
    font-size: 13px;
    font-weight: 600;
    color: var(--tdn-text-dark);
}

.tdn-char-count {
    font-size: 11px;
    color: var(--tdn-text-light);
    font-weight: 400;
}

.tdn-input-panel textarea {
    flex: 1;
    border: none;
    padding: 16px;
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    outline: none;
    color: var(--tdn-text);
    background: var(--tdn-white);
    min-height: 250px;
}

.tdn-input-panel textarea::placeholder {
    color: #AAAAAA;
}

.tdn-panel-actions {
    display: flex;
    gap: 4px;
    padding: 6px 10px;
    background: #FAFAFA;
    border-top: 1px solid var(--tdn-border);
}

.tdn-icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    color: var(--tdn-text-light);
    transition: var(--tdn-transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tdn-icon-btn:hover {
    background: var(--tdn-bg);
    color: var(--tdn-text-dark);
}

/* Result Container */
.tdn-result-container {
    background: var(--tdn-white);
    margin: 0;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tdn-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--tdn-border);
    background: #FAFAFA;
}

.tdn-result-header h3 {
    font-size: 16px;
    color: var(--tdn-text-dark);
    font-weight: 600;
}

.tdn-result-stats {
    display: flex;
    gap: 16px;
}

.tdn-stat {
    font-size: 13px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
}

.tdn-stat-added {
    background: var(--tdn-add-bg);
    color: var(--tdn-add-text);
}

.tdn-stat-removed {
    background: var(--tdn-remove-bg);
    color: var(--tdn-remove-text);
}

.tdn-result-content {
    display: flex;
    min-height: 200px;
    max-height: 600px;
    overflow-y: auto;
    font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.8;
}

.tdn-diff-panel {
    flex: 1;
    padding: 20px;
    white-space: pre-wrap;
    word-break: break-word;
}

.tdn-diff-left {
    border-right: 1px solid var(--tdn-border);
}

/* Diff Highlights */
.tdn-diff-add {
    background: var(--tdn-add-bg);
    color: var(--tdn-add-text);
    padding: 2px 4px;
    border-radius: 3px;
}

.tdn-diff-remove {
    background: var(--tdn-remove-bg);
    color: var(--tdn-remove-text);
    padding: 2px 4px;
    border-radius: 3px;
    text-decoration: line-through;
}

.tdn-diff-equal {
    color: var(--tdn-text);
}

.tdn-diff-empty {
    opacity: 0.3;
}

.tdn-diff-inline {
    padding: 20px;
    white-space: pre-wrap;
    word-break: break-word;
    width: 100%;
}

/* Loading Skeleton */
.tdn-loading {
    padding: 30px;
    background: var(--tdn-white);
}

.tdn-skeleton {
    height: 16px;
    background: linear-gradient(90deg, #E0E0E0 25%, #F0F0F0 50%, #E0E0E0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
    margin-bottom: 12px;
}

.tdn-skeleton-short {
    width: 60%;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Toast Notification */
.tdn-toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 24px;
    border-radius: var(--tdn-radius-sm);
    color: white;
    font-size: 14px;
    font-weight: 500;
    z-index: 9999;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    box-shadow: var(--tdn-shadow-lg);
}

.tdn-toast-show {
    opacity: 1;
    transform: translateY(0);
}

.tdn-toast-success {
    background: #28a745;
}

.tdn-toast-error {
    background: #dc3545;
}

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

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
    .tdn-toolbar {
        padding: 10px 12px;
        gap: 8px;
    }
    
    .tdn-options {
        gap: 10px;
        padding: 8px 12px;
    }
    
    .tdn-input-container {
        min-height: 250px;
    }
    
    .tdn-input-panel textarea {
        min-height: 200px;
        font-size: 13px;
    }
}

/* Mobile (below 768px) */
@media (max-width: 768px) {
    .tdn-wrapper {
        margin: 10px;
        border-radius: var(--tdn-radius-sm);
    }
    
    .tdn-header {
        height: 50px;
    }
    
    .tdn-header-title {
        font-size: 16px;
    }
    
    .tdn-toolbar {
        flex-direction: column;
        gap: 10px;
        padding: 10px;
    }
    
    .tdn-toolbar-left,
    .tdn-toolbar-right {
        width: 100%;
        justify-content: center;
    }
    
    .tdn-toolbar-center {
        width: 100%;
        order: -1;
    }
    
    .tdn-btn {
        padding: 8px 14px;
        font-size: 11px;
    }
    
    .tdn-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .tdn-granularity {
        margin-left: 0;
        width: 100%;
    }
    
    .tdn-granularity select {
        flex: 1;
    }
    
    /* Stack panels vertically on mobile */
    .tdn-input-container {
        flex-direction: column;
        gap: 1px;
    }
    
    .tdn-input-panel {
        min-height: 200px;
    }
    
    .tdn-input-panel textarea {
        min-height: 150px;
        font-size: 12px;
        padding: 12px;
    }
    
    .tdn-result-content {
        flex-direction: column;
        max-height: 400px;
    }
    
    .tdn-diff-left {
        border-right: none;
        border-bottom: 1px solid var(--tdn-border);
    }
    
    .tdn-diff-panel {
        padding: 12px;
        font-size: 12px;
    }
    
    .tdn-result-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }
}

/* Small Mobile (below 480px) */
@media (max-width: 480px) {
    .tdn-wrapper {
        margin: 0;
        border-radius: 0;
    }
    
    .tdn-header {
        height: 44px;
    }
    
    .tdn-header-title {
        font-size: 14px;
        letter-spacing: 0.5px;
    }
    
    .tdn-toolbar {
        padding: 8px;
    }
    
    .tdn-btn {
        padding: 6px 10px;
        font-size: 10px;
        gap: 4px;
    }
    
    .tdn-btn svg {
        width: 12px;
        height: 12px;
    }
    
    .tdn-view-btn {
        padding: 6px 10px;
        font-size: 11px;
    }
    
    .tdn-input-panel textarea {
        min-height: 120px;
        font-size: 11px;
    }
    
    .tdn-result-content {
        max-height: 300px;
        font-size: 11px;
    }
}

/* Large Screens (1440px+) */
@media (min-width: 1440px) {
    .tdn-wrapper {
        max-width: 1400px;
    }
    
    .tdn-input-panel textarea {
        min-height: 350px;
    }
    
    .tdn-result-content {
        max-height: 800px;
    }
}

/* 4K Screens */
@media (min-width: 2560px) {
    .tdn-wrapper {
        max-width: 2000px;
    }
    
    .tdn-input-panel textarea {
        min-height: 500px;
        font-size: 16px;
    }
    
    .tdn-result-content {
        max-height: 1000px;
        font-size: 16px;
    }
}

/* Print Styles */
@media print {
    .tdn-header,
    .tdn-toolbar,
    .tdn-options,
    .tdn-input-container,
    .tdn-panel-actions {
        display: none !important;
    }
    
    .tdn-result-container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .tdn-wrapper * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}