/**
 * Image Splitter Tool - Zhween Classroom Tools
 *
 * Split images and PDFs into grid pieces
 * Supports RTL languages and dark mode
 */

/* ==========================================================================
   CSS Custom Properties
   ========================================================================== */

:root {
    /* Brand Colors */
    --splitter-primary: #15aebf;
    --splitter-primary-hover: #0e9aa8;
    --splitter-primary-light: rgba(21, 174, 191, 0.1);

    /* Surface Colors */
    --splitter-bg: #f8fafc;
    --splitter-surface: #ffffff;

    /* Text Colors */
    --splitter-text: #1e293b;
    --splitter-text-secondary: #64748b;
    --splitter-text-muted: #94a3b8;

    /* Border & Dividers */
    --splitter-border: #e2e8f0;
    --splitter-border-light: #f1f5f9;

    /* Feedback Colors */
    --splitter-success: #22c55e;
    --splitter-success-light: rgba(34, 197, 94, 0.1);
    --splitter-accent: #ffd93d;
    --splitter-grid-line: #FF6B6B;

    /* Shadows */
    --splitter-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --splitter-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);

    /* Spacing */
    --splitter-panel-width: 280px;
    --splitter-gap: 1rem;
    --splitter-radius: 12px;
    --splitter-radius-sm: 8px;

    /* Transitions */
    --splitter-transition: 150ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --splitter-bg: #0f172a;
        --splitter-surface: #1e293b;
        --splitter-text: #f1f5f9;
        --splitter-text-secondary: #94a3b8;
        --splitter-text-muted: #64748b;
        --splitter-border: #334155;
        --splitter-border-light: #1e293b;
        --splitter-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
        --splitter-shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    }
}

/* ==========================================================================
   Base Container
   ========================================================================== */

.splitter {
    display: flex;
    flex-direction: column;
    background: var(--splitter-bg);
    color: var(--splitter-text);
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    overflow-x: hidden;
}

/* ==========================================================================
   Body Layout
   ========================================================================== */

.splitter__body {
    display: flex;
    flex: 1 1 auto;
    gap: var(--splitter-gap);
    padding: var(--splitter-gap);
    overflow: auto;
}

/* ==========================================================================
   Left Panel
   ========================================================================== */

.splitter__panel {
    width: var(--splitter-panel-width);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-y: auto;
}

/* ==========================================================================
   Sections
   ========================================================================== */

.splitter__section {
    background: var(--splitter-surface);
    border-radius: var(--splitter-radius);
    padding: 0.75rem;
    border: 1px solid var(--splitter-border);
}

.splitter__section--actions {
    margin-top: auto;
}

.splitter__section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--splitter-text);
    margin: 0 0 0.625rem 0;
}

.splitter__step-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: var(--splitter-primary);
    color: white;
    border-radius: 50%;
    font-size: 0.65rem;
    font-weight: 700;
}

/* ==========================================================================
   Upload Zone
   ========================================================================== */

.splitter__upload {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    border: 2px dashed var(--splitter-border);
    border-radius: var(--splitter-radius-sm);
    background: var(--splitter-border-light);
    cursor: pointer;
    transition: all var(--splitter-transition);
    text-align: center;
}

.splitter__upload:hover,
.splitter__upload--dragover {
    border-color: var(--splitter-primary);
    background: var(--splitter-primary-light);
}

.splitter__upload-icon {
    color: var(--splitter-text-muted);
    margin-bottom: 0.5rem;
    transition: color var(--splitter-transition);
}

.splitter__upload:hover .splitter__upload-icon {
    color: var(--splitter-primary);
}

.splitter__upload-text {
    margin: 0;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--splitter-text);
}

.splitter__upload-badges {
    display: flex;
    gap: 0.25rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.splitter__badge {
    background: var(--splitter-surface);
    padding: 0.15rem 0.4rem;
    border-radius: 10px;
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--splitter-primary);
    border: 1px solid var(--splitter-border);
}

/* File Info */
.splitter__file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--splitter-primary-light);
    border-radius: var(--splitter-radius-sm);
    border: 1px solid var(--splitter-primary);
}

.splitter__file-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--splitter-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ==========================================================================
   Settings
   ========================================================================== */

.splitter__setting {
    margin-bottom: 0.75rem;
}

.splitter__setting:last-child {
    margin-bottom: 0;
}

.splitter__label {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--splitter-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-bottom: 0.375rem;
}

/* Mode Toggle */
.splitter__mode-toggle {
    display: flex;
    background: var(--splitter-border-light);
    border-radius: var(--splitter-radius-sm);
    padding: 3px;
    margin-bottom: 0.75rem;
}

.splitter__mode-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.4rem;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--splitter-text-muted);
    cursor: pointer;
    transition: all var(--splitter-transition);
}

.splitter__mode-btn--active {
    background: var(--splitter-primary);
    color: white;
}

/* Grid Options */
.splitter__grid-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.375rem;
}

.splitter__grid-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.25rem;
    background: var(--splitter-border-light);
    border: 2px solid transparent;
    border-radius: var(--splitter-radius-sm);
    cursor: pointer;
    transition: all var(--splitter-transition);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--splitter-text);
}

.splitter__grid-option:hover {
    border-color: var(--splitter-primary-light);
}

.splitter__grid-option--active {
    border-color: var(--splitter-primary);
    background: var(--splitter-primary-light);
}

.splitter__grid-preview {
    display: grid;
    gap: 2px;
    width: 24px;
    height: 24px;
}

.splitter__grid-preview span {
    background: var(--splitter-text-muted);
    border-radius: 2px;
}

.splitter__grid-option--active .splitter__grid-preview span {
    background: var(--splitter-primary);
}

/* Orientation Options */
.splitter__orientation-options {
    display: flex;
    gap: 0.375rem;
}

.splitter__orientation-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.125rem;
    padding: 0.4rem;
    background: var(--splitter-border-light);
    border: 2px solid transparent;
    border-radius: var(--splitter-radius-sm);
    cursor: pointer;
    transition: all var(--splitter-transition);
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--splitter-text-muted);
}

.splitter__orientation-option:hover {
    border-color: var(--splitter-primary-light);
}

.splitter__orientation-option--active {
    border-color: var(--splitter-primary);
    background: var(--splitter-primary-light);
    color: var(--splitter-primary);
}

.splitter__orientation-icon {
    font-size: 1rem;
}

/* Output Options */
.splitter__output-options {
    display: flex;
    gap: 0.375rem;
}

.splitter__output-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.125rem;
    padding: 0.5rem;
    background: var(--splitter-border-light);
    border: 2px solid transparent;
    border-radius: var(--splitter-radius-sm);
    cursor: pointer;
    transition: all var(--splitter-transition);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--splitter-text);
}

.splitter__output-option:hover {
    border-color: var(--splitter-primary-light);
}

.splitter__output-option--active {
    border-color: var(--splitter-primary);
    background: var(--splitter-primary-light);
    color: var(--splitter-primary);
}

.splitter__output-icon {
    font-size: 1.1rem;
}

/* ==========================================================================
   Info Box
   ========================================================================== */

.splitter__info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    padding: 0.625rem;
    background: linear-gradient(135deg, rgba(255, 217, 61, 0.15), rgba(255, 217, 61, 0.05));
    border: 1px solid var(--splitter-accent);
    border-radius: var(--splitter-radius-sm);
    margin-bottom: 0.75rem;
}

.splitter__info-item {
    text-align: center;
}

.splitter__info-value {
    font-size: 1rem;
    font-weight: 800;
    color: var(--splitter-primary);
}

.splitter__info-label {
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--splitter-text-muted);
    text-transform: uppercase;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.splitter__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--splitter-radius-sm);
    cursor: pointer;
    transition: all var(--splitter-transition);
}

.splitter__btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.splitter__btn--primary {
    background: var(--splitter-primary);
    color: white;
}

.splitter__btn--primary:hover:not(:disabled) {
    background: var(--splitter-primary-hover);
    transform: translateY(-1px);
}

.splitter__btn--ghost {
    background: transparent;
    color: var(--splitter-text-secondary);
    padding: 0.375rem 0.5rem;
}

.splitter__btn--ghost:hover:not(:disabled) {
    background: var(--splitter-border-light);
    color: var(--splitter-text);
}

.splitter__btn--sm {
    font-size: 0.65rem;
    padding: 0.25rem 0.5rem;
}

.splitter__btn--full {
    width: 100%;
}

/* ==========================================================================
   Progress
   ========================================================================== */

.splitter__progress {
    margin-top: 0.75rem;
}

.splitter__progress-bar {
    height: 6px;
    background: var(--splitter-border-light);
    border-radius: 3px;
    overflow: hidden;
}

.splitter__progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--splitter-primary), var(--splitter-accent));
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

.splitter__progress-text {
    text-align: center;
    margin-top: 0.375rem;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--splitter-text-muted);
}

/* ==========================================================================
   Main Content Area
   ========================================================================== */

.splitter__main {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 0;
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.splitter__empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background: var(--splitter-surface);
    border-radius: var(--splitter-radius);
    border: 1px solid var(--splitter-border);
    text-align: center;
    flex: 1;
}

.splitter__empty svg {
    color: var(--splitter-text-muted);
    margin-bottom: 1rem;
}

.splitter__empty h3 {
    margin: 0 0 0.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--splitter-text);
}

.splitter__empty p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--splitter-text-secondary);
}

/* ==========================================================================
   Preview Container
   ========================================================================== */

.splitter__preview {
    background: var(--splitter-surface);
    border-radius: var(--splitter-radius);
    border: 1px solid var(--splitter-border);
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* PDF Navigation */
.splitter__pdf-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.splitter__nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--splitter-border-light);
    border: 1px solid var(--splitter-border);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--splitter-transition);
    color: var(--splitter-text-muted);
}

.splitter__nav-btn:hover:not(:disabled) {
    background: var(--splitter-primary);
    border-color: var(--splitter-primary);
    color: white;
}

.splitter__nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.splitter__nav-btn svg {
    fill: currentColor;
}

.splitter__nav-text {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--splitter-text);
    direction: ltr;
}

/* Image Wrapper */
.splitter__image-wrap {
    position: relative;
    background: var(--splitter-border-light);
    border-radius: var(--splitter-radius-sm);
    overflow: hidden;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.splitter__image-wrap img,
.splitter__image-wrap canvas {
    max-width: 100%;
    max-height: 100%;
    height: auto;
    display: block;
}

.splitter__loading {
    color: var(--splitter-text-muted);
    font-size: 0.875rem;
}

/* Grid Overlay */
.splitter__grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.splitter__grid-line-h,
.splitter__grid-line-v {
    position: absolute;
    background: var(--splitter-grid-line);
}

.splitter__grid-line-h {
    height: 3px;
    width: 100%;
    left: 0;
    box-shadow: 0 0 8px var(--splitter-grid-line);
}

.splitter__grid-line-v {
    width: 3px;
    height: 100%;
    top: 0;
    box-shadow: 0 0 8px var(--splitter-grid-line);
}

/* Grid Labels */
.splitter__grid-labels {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.splitter__grid-label {
    position: absolute;
    background: var(--splitter-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.15rem 0.4rem;
    border-radius: 5px;
    transform: translate(-50%, -50%);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

/* ==========================================================================
   Results Area
   ========================================================================== */

.splitter__results {
    background: var(--splitter-surface);
    border-radius: var(--splitter-radius);
    border: 1px solid var(--splitter-border);
    padding: 1rem;
}

.splitter__results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.splitter__results-header h3 {
    margin: 0;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--splitter-text);
}

.splitter__results-count {
    background: var(--splitter-accent);
    color: var(--splitter-text);
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
    font-size: 0.65rem;
    font-weight: 700;
}

.splitter__results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 0.5rem;
    max-height: 200px;
    overflow-y: auto;
}

.splitter__result-item {
    background: var(--splitter-border-light);
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--splitter-border);
    transition: all var(--splitter-transition);
}

.splitter__result-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.splitter__result-item img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
}

.splitter__result-item-label {
    padding: 0.25rem;
    text-align: center;
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--splitter-text-muted);
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 900px) {
    .splitter__body {
        flex-direction: column;
    }

    .splitter__panel {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .splitter__section {
        flex: 1 1 calc(50% - 0.25rem);
        min-width: 200px;
    }

    .splitter__section--actions {
        flex-basis: 100%;
        margin-top: 0;
    }

    .splitter__empty,
    .splitter__preview {
        min-height: 250px;
    }
}

@media (max-width: 600px) {
    :root {
        --splitter-panel-width: 100%;
        --splitter-gap: 0.75rem;
    }

    .splitter__section {
        flex-basis: 100%;
    }

    .splitter__grid-options {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .splitter__btn:hover,
    .splitter__grid-option:hover,
    .splitter__orientation-option:hover,
    .splitter__output-option:hover,
    .splitter__result-item:hover,
    .splitter__upload:hover {
        transform: none;
    }

    .splitter__progress-fill {
        transition: none;
    }
}

/* ==========================================================================
   RTL Support
   ========================================================================== */

[dir="rtl"] .splitter__section-title {
    flex-direction: row-reverse;
}

[dir="rtl"] .splitter__file-info {
    flex-direction: row-reverse;
}

[dir="rtl"] .splitter__btn {
    flex-direction: row-reverse;
}

[dir="rtl"] .splitter__nav-text {
    direction: ltr;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
    .splitter__panel {
        display: none !important;
    }

    .splitter__body {
        display: block;
        padding: 0;
    }

    .splitter__main {
        page-break-inside: avoid;
    }
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes splitter-fade-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.splitter__fade-in {
    animation: splitter-fade-in 0.3s ease forwards;
}