:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --success: #059669;
    --bg-light: #f8fafc;
    --text-main: #0f172a;
    --text-sub: #64748b;
    --white: #ffffff;
    --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -6px rgba(0, 0, 0, 0.1);
}

.ui-resizer-container {
    max-width: 900px;
    margin: 40px auto;
    font-family: 'Inter', -apple-system, sans-serif;
}

.ui-card {
    background: var(--white);
    padding: 40px;
    border-radius: 28px;
    box-shadow: var(--shadow);
    display: none;
    animation: slideUp 0.5s ease-out;
}

.ui-card.active { display: block; }

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.ui-header { text-align: center; margin-bottom: 35px; }
.ui-header h2 { font-size: 30px; color: var(--text-main); font-weight: 800; letter-spacing: -1px; }
.ui-header p { color: var(--text-sub); margin-top: 5px; }

.ui-drop-area {
    border: 2px dashed #cbd5e1;
    padding: 60px 20px;
    text-align: center;
    border-radius: 24px;
    background: #fcfcfd;
    transition: 0.3s;
}

.ui-drop-area:hover { border-color: var(--primary); background: #f5f3ff; }

.ui-upload-icon { color: var(--primary); margin-bottom: 20px; }

.ui-browse-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 15px;
    transition: 0.2s;
}

.ui-browse-btn:hover { background: var(--primary-hover); transform: scale(1.05); }

.ui-file-list { margin-top: 30px; }

.ui-file-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 15px 25px; background: var(--bg-light);
    border-radius: 15px; margin-bottom: 10px; border: 1px solid #f1f5f9;
}

.ui-main-btn {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    width: 100%; max-width: 320px; margin: 35px auto 0;
    padding: 18px; background: var(--primary); color: white;
    border: none; border-radius: 16px; cursor: pointer;
    font-size: 16px; font-weight: 700; transition: 0.3s;
}

.ui-main-btn:hover { background: var(--primary-hover); box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4); }

.ui-btn-primary { background: var(--success); }
.ui-btn-outline { background: transparent; color: var(--text-sub); border: 2px solid #e2e8f0; margin-top: 15px; }

.ui-preview-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px; margin: 35px 0;
}

.ui-prev-card {
    background: var(--white); border: 1px solid #f1f5f9;
    padding: 15px; border-radius: 20px; text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}

.ui-prev-card img { width: 100%; height: 140px; object-fit: cover; border-radius: 12px; }

.ui-size-info { font-size: 12px; font-weight: 600; color: var(--text-sub); margin: 15px 0; }
.ui-size-info span { color: var(--success); background: #ecfdf5; padding: 2px 6px; border-radius: 4px; }

.ui-single-dl {
    display: block; padding: 10px; background: #f1f5f9;
    color: var(--text-main); text-decoration: none; border-radius: 10px;
    font-size: 14px; font-weight: 700; transition: 0.2s;
}

.ui-single-dl:hover { background: var(--primary); color: white; }