:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --border-color: rgba(148, 163, 184, 0.1);
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --radius-lg: 16px;
    --radius-md: 8px;
    --radius-sm: 4px;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Background Effects */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.08) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
}

.tool-header {
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 2rem;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
}

/* Sidebar / Controls */
.controls-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 6rem;
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-group h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Mode Selection */
.mode-selection {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.mode-selection label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: color 0.2s ease;
    user-select: none;
}

.mode-selection label:hover {
    color: var(--text-primary);
}

.mode-selection input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1rem;
    height: 1rem;
    border: 1px solid var(--text-secondary);
    border-radius: 50%;
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
    background: transparent;
}

.mode-selection input[type="radio"]:checked {
    border-color: var(--accent-primary);
}

.mode-selection input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.5rem;
    height: 0.5rem;
    background: var(--accent-primary);
    border-radius: 50%;
}

/* Custom Buttons */
.btn {
    appearance: none;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.btn:hover {
    background: var(--bg-primary);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    border: none;
    box-shadow: 0 0 15px var(--accent-glow);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 25px var(--accent-glow);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Custom Checkbox */
input[type="checkbox"] {
    position: relative;
    width: 1rem;
    height: 1rem;
    appearance: none;
    border: 1px solid var(--text-secondary);
    border-radius: 3px;
    background: transparent;
    transition: all 0.2s;
    cursor: pointer;
}

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

input[type="checkbox"]:checked::after {
    content: '✔';
    position: absolute;
    color: white;
    font-size: 0.7rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Profile Selection */
.profiles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.profile-option {
    position: relative;
    cursor: pointer;
}

.profile-option input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.profile-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.profile-card .icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
    opacity: 0.7;
}

.profile-card span {
    font-size: 0.85rem;
    font-weight: 500;
}

.profile-card small {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.profile-option input:checked~.profile-card {
    border-color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.1);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

/* Quality Slider */
input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    appearance: none;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: 2px solid var(--bg-primary);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Output Config */
.file-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
    display: none;
}

.file-info.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* Main Content Area */
.preview-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    text-align: center;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.01);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.05);
}

.drop-zone-content {
    pointer-events: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.drop-icon {
    font-size: 3rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Results Grid */
.results-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.image-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    transition: transform 0.2s;
    animation: slideUp 0.3s ease forwards;
}

.image-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.image-preview {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    background: #000 url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI4IiBoZWlnaHQ9IjgiPjxyZWN0IHdpZHRoPSI4IiBoZWlnaHQ9IjgiIGZpbGw9IiMzMzMiLz48cmVjdCB3aWR0aD0iNCIgaGVpZ2h0PSI0IiBmaWxsPSIjNDQ0Ii8+PHJlY3QgeD0iNCIgeT0iNCIgd2lkdGg9IjQiIGhlaWdodD0iNCIgZmlsbD0iIzQ0NCIvPjwvc3ZnPg==');
}

.image-details {
    padding: 0.75rem;
}

.image-name {
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.25rem;
}

.image-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

.status-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 1rem;
    font-size: 0.7rem;
    backdrop-filter: blur(4px);
}

.status-success {
    background: var(--success);
}

.status-error {
    background: var(--error);
}

.status-pending {
    background: var(--warning);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

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

/* Responsiveness */
@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        position: static;
    }
}