:root {
    --uir-primary: #6366F1;
    --uir-primary-dark: #4F46E5;
    --uir-success: #10B981;
    --uir-danger: #EF4444;
    --uir-dark: #1F2937;
    --uir-gray: #6B7280;
    --uir-border: #E5E7EB;
    --uir-radius: 20px;
    --uir-radius-sm: 12px;
    --uir-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.uir-app {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #F3F4F6 0%, #E5E7EB 100%);
    min-height: 100vh;
    padding: 40px 20px;
}
.uir-container { max-width: 800px; margin: 0 auto; }

.uir-hero { text-align: center; margin-bottom: 40px; animation: uirSlideUp 0.5s ease-out; }
.uir-badge { display: inline-block; background: rgba(99,102,241,0.1); padding: 6px 16px; border-radius: 60px; font-size: 13px; font-weight: 500; color: var(--uir-primary); margin-bottom: 16px; }
.uir-hero-title { font-size: 42px; font-weight: 800; margin-bottom: 12px; background: linear-gradient(135deg, var(--uir-dark) 0%, var(--uir-primary) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.uir-gradient { background: linear-gradient(135deg, var(--uir-primary), #F59E0B); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.uir-hero-desc { color: var(--uir-gray); font-size: 15px; }

.uir-card { background: white; border-radius: var(--uir-radius); padding: 28px; margin-bottom: 24px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); transition: var(--uir-transition); }
.uir-card:hover { transform: translateY(-2px); box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }

.uir-upload-card { cursor: pointer; }
.uir-upload-zone { text-align: center; padding: 20px; }
.uir-upload-icon { font-size: 64px; margin-bottom: 16px; transition: var(--uir-transition); }
.uir-upload-card:hover .uir-upload-icon { transform: scale(1.1); }
.uir-upload-title { font-size: 20px; font-weight: 600; margin-bottom: 8px; color: var(--uir-dark); }
.uir-upload-or { color: var(--uir-gray); margin: 12px 0; }
.uir-upload-hint { font-size: 12px; color: var(--uir-gray); margin-top: 16px; }

.uir-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border: none; border-radius: 40px; font-size: 15px; font-weight: 600; cursor: pointer; transition: var(--uir-transition); text-decoration: none; }
.uir-btn-outline { background: transparent; border: 2px solid var(--uir-primary); color: var(--uir-primary); }
.uir-btn-outline:hover { background: var(--uir-primary); color: white; transform: translateY(-2px); }
.uir-btn-primary { background: linear-gradient(135deg, var(--uir-primary), var(--uir-primary-dark)); color: white; box-shadow: 0 4px 12px rgba(99,102,241,0.3); }
.uir-btn-primary:hover { transform: translateY(-2px); }
.uir-btn-secondary { background: #F9FAFB; color: var(--uir-dark); border: 1px solid var(--uir-border); }
.uir-btn-secondary:hover { background: var(--uir-border); transform: translateY(-2px); }
.uir-btn-download { background: linear-gradient(135deg, var(--uir-success), #059669); color: white; }

.uir-preview-section { background: linear-gradient(135deg, #1a1a2e, #16213e); border-radius: var(--uir-radius-sm); padding: 20px; margin-bottom: 24px; }
.uir-preview-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.uir-preview-label { color: white; font-size: 14px; font-weight: 500; }
.uir-clear-btn { background: rgba(255,255,255,0.1); border: none; color: white; width: 32px; height: 32px; border-radius: 50%; cursor: pointer; font-size: 18px; transition: var(--uir-transition); }
.uir-clear-btn:hover { background: var(--uir-danger); transform: scale(1.05); }
.uir-preview-wrapper img { max-width: 100%; max-height: 250px; border-radius: var(--uir-radius-sm); box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
.uir-preview-meta { display: flex; justify-content: center; gap: 16px; font-size: 12px; color: rgba(255,255,255,0.7); }

.uir-settings-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid var(--uir-border); font-weight: 600; color: var(--uir-dark); }
.uir-quality-badge { background: linear-gradient(135deg, var(--uir-primary), #F59E0B); color: white; padding: 4px 12px; border-radius: 40px; font-size: 12px; }
.uir-field-group { margin-bottom: 20px; }
.uir-field-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--uir-dark); }
.uir-field-hint { font-size: 11px; color: var(--uir-gray); margin-top: 6px; }
.uir-select { width: 100%; padding: 12px 16px; border: 1px solid var(--uir-border); border-radius: var(--uir-radius-sm); font-size: 14px; background: white; cursor: pointer; }
.uir-size-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.uir-size-input { flex: 1; position: relative; }
.uir-input { width: 100%; padding: 12px 40px 12px 16px; border: 1px solid var(--uir-border); border-radius: var(--uir-radius-sm); font-size: 14px; }
.uir-input-unit { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: var(--uir-gray); font-size: 12px; }
.uir-lock-btn { background: #F9FAFB; border: 1px solid var(--uir-border); border-radius: var(--uir-radius-sm); padding: 0 16px; height: 46px; font-size: 18px; cursor: pointer; }
.uir-lock-btn.active { background: var(--uir-primary); border-color: var(--uir-primary); color: white; }
.uir-format-row { display: flex; gap: 20px; flex-wrap: wrap; }
.uir-radio { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: 14px; }
.uir-radio input { accent-color: var(--uir-primary); }
.uir-quality-row { display: flex; justify-content: space-between; margin-bottom: 10px; }
.uir-quality-value { font-weight: 700; color: var(--uir-primary); }
.uir-slider { width: 100%; height: 6px; -webkit-appearance: none; background: var(--uir-border); border-radius: 3px; }
.uir-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; background: var(--uir-primary); border-radius: 50%; cursor: pointer; }
.uir-actions { display: flex; gap: 12px; margin-top: 24px; }
.uir-actions .uir-btn { flex: 1; }

.uir-result-header { text-align: center; margin-bottom: 20px; }
.uir-result-header h3 { font-size: 24px; color: var(--uir-success); }
.uir-result-preview img { max-width: 100%; max-height: 250px; border-radius: var(--uir-radius-sm); }
.uir-result-stats { display: flex; justify-content: center; gap: 32px; margin-bottom: 24px; }
.uir-stat { text-align: center; }
.uir-stat-label { font-size: 11px; color: var(--uir-gray); text-transform: uppercase; }
.uir-stat-value { font-size: 18px; font-weight: 700; color: var(--uir-dark); }
.uir-stat-success { color: var(--uir-success); }
.uir-result-actions { display: flex; gap: 12px; justify-content: center; }
.uir-watermark { text-align: center; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--uir-border); font-size: 11px; color: var(--uir-gray); }
.uir-watermark a { color: var(--uir-primary); text-decoration: none; }

.uir-progress-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(8px); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.uir-progress-card { background: white; border-radius: var(--uir-radius); padding: 40px; text-align: center; min-width: 300px; }
.uir-spinner { width: 50px; height: 50px; border: 4px solid #E5E7EB; border-top-color: #6366F1; border-radius: 50%; animation: spin 0.8s linear infinite; margin: 0 auto 20px; }
@keyframes spin { to { transform: rotate(360deg); } }
.uir-progress-bar { height: 8px; background: var(--uir-border); border-radius: 4px; overflow: hidden; margin-bottom: 12px; }
.uir-progress-fill { height: 100%; background: linear-gradient(90deg, var(--uir-primary), #F59E0B); width: 0%; transition: width 0.3s ease; }

.uir-error-toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%); background: var(--uir-danger); color: white; padding: 12px 24px; border-radius: 60px; display: flex; align-items: center; gap: 10px; z-index: 1001; }

.uir-footer { text-align: center; margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(0,0,0,0.1); }
.uir-footer-badge { display: inline-block; background: rgba(99,102,241,0.1); padding: 6px 16px; border-radius: 60px; font-size: 12px; color: var(--uir-primary); margin-bottom: 12px; }

@keyframes uirSlideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes uirCelebrate { 0%,100% { transform: scale(1); } 50% { transform: scale(1.1); } }
.uir-success-animation { animation: uirCelebrate 0.5s ease-in-out; }

@media (max-width: 640px) {
    .uir-hero-title { font-size: 32px; }
    .uir-card { padding: 20px; }
    .uir-size-row { flex-direction: column; }
    .uir-size-sep { display: none; }
    .uir-format-row { flex-direction: column; }
    .uir-actions { flex-direction: column; }
}