/* Global Variables & Colors */
:root {
    --bg-main: #080f26;
    --bg-card: #0f1c3f;
    --bg-darker: #020617;
    --border-color: #1e2e6b;
    --text-primary: #f1f5f9;
    --text-muted: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-glow: #60a5fa;
    --accent-green: #10b981;
    --border-accent: #2563eb;
    --font-family: 'Segoe UI', -apple-system, Roboto, Helvetica, sans-serif;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 1280px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header Styles */
header {
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, var(--text-primary), var(--accent-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.pulse-icon {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent-glow);
    box-shadow: 0 0 12px var(--accent-glow);
    display: inline-block;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(96, 165, 250, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(96, 165, 250, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(96, 165, 250, 0);
    }
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.privacy-banner {
    display: inline-flex;
    align-items: center;
    background-color: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 6px;
    padding: 6px 12px;
    margin-top: 10px;
    font-size: 0.82rem;
    color: #a7f3d0;
    max-width: fit-content;
}

.privacy-icon {
    color: var(--accent-green);
    flex-shrink: 0;
}

/* Dashboard Layout */
.dashboard {
    display: flex;
    gap: 20px;
    flex-grow: 1;
}

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

/* Sidebar Styles */
.sidebar {
    width: 320px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex-shrink: 0;
}

@media (max-width: 900px) {
    .sidebar {
        width: 100%;
    }
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.card h2, .card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-glow);
    border-bottom: 1px solid rgba(30, 46, 107, 0.5);
    padding-bottom: 8px;
}

/* Form Controls */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

select {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

select:focus {
    border-color: var(--accent-blue);
}

.settings-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.3;
}

/* Buttons */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-align: center;
    width: 100%;
    outline: none;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: #ffffff;
}

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

.btn-primary:disabled {
    background-color: #1e293b;
    color: #64748b;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: #0f766e;
    color: #ffffff;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #0d9488;
}

.btn-secondary:disabled {
    background-color: #1e293b;
    color: #64748b;
    cursor: not-allowed;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: rgba(30, 46, 107, 0.2);
    border-color: var(--accent-blue);
}

/* Info Card */
.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
}

.stat-row span:first-child {
    color: var(--text-muted);
}

.stat-row span:last-child {
    font-family: monospace;
    font-weight: bold;
    color: var(--accent-glow);
}

/* Workspace Panel */
.workspace {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-height: 400px;
}

/* Dropzone Styles */
.dropzone-card {
    background-color: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    cursor: pointer;
    transition: all 0.2s;
}

.dropzone-card:hover, .dropzone-card.dragover {
    border-color: var(--accent-blue);
    background-color: rgba(15, 28, 63, 0.6);
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    text-align: center;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
}

.dropzone-card:hover .upload-icon {
    color: var(--accent-glow);
    transform: translateY(-4px);
    transition: transform 0.2s;
}

.dropzone-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.dropzone-content p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.dropzone-content .btn {
    width: auto;
    margin-top: 8px;
}

/* Preview & Slider Layout */
.preview-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 450px;
}

.slider-container {
    position: relative;
    width: 100%;
    max-width: 100%;
    max-height: 65vh;
    aspect-ratio: 16 / 9; /* Default fallback, will be overwritten by JS */
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-darker);
    overflow: hidden;
    user-select: none;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    touch-action: none; /* Prevent scrolling when dragging on touch devices */
}

.zoom-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform-origin: 0 0;
    will-change: transform;
}

/* Both original image and upscaled canvas fill the zoom wrapper exactly */
.zoom-wrapper img, .zoom-wrapper canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    pointer-events: none;
}

/* Original image is on top, initially fully visible, clipped dynamically */
.zoom-wrapper img {
    z-index: 2;
    clip-path: none;
}

/* Enhanced canvas in the background */
.zoom-wrapper canvas {
    z-index: 1;
}

/* Draggable divider handle */
.slider-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    background-color: var(--accent-glow);
    box-shadow: 0 0 10px var(--accent-glow);
    z-index: 10;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    pointer-events: none;
}

.slider-handle-line {
    flex-grow: 1;
    width: 2px;
    background-color: rgba(255, 255, 255, 0.4);
}

.slider-handle-button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 2px solid var(--accent-glow);
    box-shadow: 0 0 12px rgba(96, 165, 250, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-primary);
    cursor: ew-resize;
    pointer-events: auto; /* Handle pointer events for dragging */
    transition: transform 0.1s, background-color 0.2s;
}

.slider-handle-button:hover {
    transform: scale(1.15);
    background-color: var(--border-color);
}

/* Badges */
.badge {
    position: absolute;
    top: 12px;
    background-color: rgba(2, 6, 23, 0.85);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: bold;
    z-index: 5;
    letter-spacing: 0.05em;
    pointer-events: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.badge-before {
    left: 12px;
    border-left: 3px solid var(--text-muted);
}

.badge-after {
    right: 12px;
    border-right: 3px solid var(--accent-glow);
    color: var(--accent-glow);
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(2, 6, 23, 0.85);
    display: none; /* Controlled by JS */
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 16px;
    z-index: 20;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(96, 165, 250, 0.1);
    border-top-color: var(--accent-glow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    font-size: 0.9rem;
    color: var(--accent-glow);
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* Footer Styles */
footer {
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    text-align: center;
}

footer p {
    font-size: 0.75rem;
    color: var(--text-muted);
}