:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --success: #10b981;
    --bg-light: #f8fafc;
    --text-main: #1e293b;
    --text-sub: #64748b;
    --white: #ffffff;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

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

.ui-card {
    background: var(--white);
    padding: 40px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    display: none;
    animation: fadeIn 0.4s ease-out;
}

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

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

.ui-header { text-align: center; margin-bottom: 30px; }
.ui-header h2 { font-size: 28px; color: var(--text-main); margin-bottom: 8px; font-weight: 800; }
.ui-header p { color: var(--text-sub); font-size: 16px; }

.ui-drop-area {
    border: 2px dashed #e2e8f0;
    padding: 50px 20px;
    text-align: center;
    border-radius: 20px;
    background: var(--bg-light);
    transition: all 0.3s ease;
}

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

.ui-upload-icon { color: var(--primary); margin-bottom: 15px; opacity: 0.8; }

.ui-drop-area h3 { font-size: 18px; color: var(--text-main); margin-bottom: 5px; }
.ui-drop-area p { font-size: 14px; color: var(--text-sub); margin-bottom: 20px; }

.ui-browse-btn {
    background: var(--white);
    border: 1px solid #e2e8f0;
    padding: 10px 24px;
    border-radius: 10px;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: 0.2s;
}

.ui-browse-btn:hover { background: var(--primary); color: white; border-color: var(--primary); }

.ui-file-list { margin-top: 25px; max-height: 200px; overflow-y: auto; }

.ui-file-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 12px 20px; background: var(--bg-light);
    border-radius: 12px; margin-bottom: 8px; border: 1px solid #f1f5f9;
}

.ui-file-item span { font-size: 14px; font-weight: 500; color: var(--text-main); }
.ui-file-item b { color: var(--primary); font-size: 13px; }

.ui-main-btn {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    width: 100%; max-width: 280px; margin: 30px auto 0;
    padding: 16px; background: var(--primary); color: white;
    border: none; border-radius: 14px; cursor: pointer;
    font-size: 16px; font-weight: 700; transition: 0.3s;
}

.ui-main-btn:hover { background: var(--primary-hover); transform: translateY(-2px); }

.ui-btn-primary { background: var(--success); }
.ui-btn-primary:hover { background: #059669; }

.ui-btn-outline { background: transparent; color: var(--text-sub); border: 2px solid #e2e8f0; }
.ui-btn-outline:hover { background: #f1f5f9; color: var(--text-main); }

.ui-preview-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px; margin: 30px 0;
}

.ui-prev-card {
    background: var(--white); border: 1px solid #f1f5f9;
    padding: 15px; border-radius: 18px; text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.ui-prev-card img { width: 100%; height: 130px; object-fit: cover; border-radius: 10px; margin-bottom: 12px; }

.ui-size-info { font-size: 11px; font-weight: 600; color: var(--text-sub); margin-bottom: 12px; }
.ui-size-info span { color: var(--success); }

.ui-single-dl {
    display: inline-block; padding: 8px 16px; background: #eff6ff;
    color: var(--primary); text-decoration: none; border-radius: 8px;
    font-size: 13px; font-weight: 700; transition: 0.2s;
}

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

.ui-footer-btns { display: flex; flex-direction: column; gap: 10px; }