:root{--color-primary: #2563EB;--color-primary-hover: #1D4ED8;--color-primary-light: #DBEAFE;--color-primary-bg: #EFF6FF;--color-success: #16A34A;--color-warning: #F59E0B;--color-error: #DC2626;--color-error-bg: #FEF2F2;--color-bg: #FFFFFF;--color-bg-secondary: #F8FAFC;--color-bg-tertiary: #F1F5F9;--color-border: #E2E8F0;--color-border-hover: #CBD5E1;--color-text: #0F172A;--color-text-secondary: #64748B;--color-text-muted: #94A3B8;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--font-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--font-mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--leading-tight: 1.25;--leading-normal: 1.5;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--max-width: 1100px;--header-height: 64px;--transition-fast: .15s ease;--transition-normal: .25s ease;--z-dropdown: 100;--z-modal: 200;--z-toast: 300}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text);background-color:var(--color-bg);min-height:100vh}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto;display:block}button{font-family:inherit;cursor:pointer}input,select,textarea{font-family:inherit;font-size:inherit}.container{max-width:var(--max-width);margin:0 auto;padding:0 var(--space-6)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}@media(max-width:768px){.container{padding:0 var(--space-4)}}.header{height:var(--header-height);border-bottom:1px solid var(--color-border);background:var(--color-bg);position:sticky;top:0;z-index:var(--z-dropdown)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%}.header-logo{display:flex;align-items:center;gap:var(--space-3);font-size:var(--text-xl);font-weight:var(--font-bold);color:var(--color-text);text-decoration:none}.header-logo:hover{text-decoration:none}.header-logo-icon{width:32px;height:32px;background:var(--color-primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff;font-size:var(--text-lg)}.header-actions{display:flex;align-items:center;gap:var(--space-4)}.lang-switcher{display:flex;align-items:center;gap:var(--space-1);background:var(--color-bg-secondary);border-radius:var(--radius-md);padding:2px;border:1px solid var(--color-border)}.lang-btn{padding:var(--space-1) var(--space-3);border:none;background:transparent;border-radius:6px;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-secondary);transition:all var(--transition-fast)}.lang-btn.active{background:var(--color-bg);color:var(--color-text);box-shadow:var(--shadow-sm)}.lang-btn:hover:not(.active){color:var(--color-text)}.main-layout{display:flex;gap:var(--space-8);align-items:flex-start;padding:var(--space-8) 0;min-height:calc(100vh - var(--header-height) - 200px)}.main-content{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--space-8);min-width:0}.ad-sidebar{width:160px;flex-shrink:0;position:sticky;top:calc(var(--header-height) + var(--space-8));display:none}@media(min-width:769px){.ad-sidebar{display:block}}@media(max-width:768px){.main-layout{padding-bottom:100px}}.tool-card{width:100%;max-width:720px;background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.tool-card-body{padding:var(--space-6)}.tool-card-footer{padding:var(--space-6);display:flex;flex-direction:column;align-items:center;gap:var(--space-4)}.tool-divider{height:1px;background:var(--color-border);margin:0}.tool-card-body .upload-area:not(.has-files):not(.has-image){padding:var(--space-10) var(--space-6)}.card{background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);box-shadow:var(--shadow-sm)}.card-header{margin-bottom:var(--space-4);font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-text)}.upload-area{border:2px dashed var(--color-border);border-radius:var(--radius-lg);padding:var(--space-12) var(--space-6);text-align:center;cursor:pointer;transition:all var(--transition-normal);background:var(--color-bg-secondary)}.upload-area:hover{border-color:var(--color-primary);background:var(--color-primary-bg)}.upload-area.dragover{border-color:var(--color-primary);background:var(--color-primary-bg);box-shadow:0 0 0 4px var(--color-primary-light)}.upload-area.has-image,.upload-area.has-files{border-style:solid;border-color:var(--color-border);background:var(--color-bg);padding:var(--space-4);cursor:default}.upload-area.has-image:hover,.upload-area.has-files:hover{border-color:var(--color-border);background:var(--color-bg)}.upload-files-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-4)}.upload-file-count{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text)}.upload-add-btn{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-primary);background:none;border:1px dashed var(--color-primary);border-radius:var(--radius-md);padding:var(--space-1) var(--space-3);cursor:pointer;transition:all var(--transition-fast)}.upload-add-btn:hover{background:var(--color-primary-bg);border-style:solid}.upload-thumb-grid{display:flex;flex-wrap:wrap;gap:var(--space-3)}.upload-thumb-item{width:100px;text-align:center;cursor:pointer;border:2px solid transparent;border-radius:var(--radius-md);padding:var(--space-2);transition:border-color var(--transition-fast),background var(--transition-fast)}.upload-thumb-item:hover{background:var(--color-bg-secondary)}.upload-thumb-item.selected{border-color:var(--color-primary);background:var(--color-primary-bg)}.upload-thumb-img-wrap{position:relative;display:inline-block;width:80px;height:80px}.upload-thumb-img-wrap img{width:80px;height:80px;object-fit:cover;border-radius:var(--radius-sm);border:1px solid var(--color-border)}.upload-thumb-remove{position:absolute;top:-6px;right:-6px;width:20px;height:20px;background:var(--color-error);color:#fff;border:none;border-radius:50%;font-size:12px;line-height:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;opacity:.85;transition:opacity var(--transition-fast)}.upload-thumb-remove:hover{opacity:1}.upload-thumb-name{font-size:var(--text-xs);color:var(--color-text-secondary);margin-top:var(--space-1);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.upload-icon{font-size:3rem;margin-bottom:var(--space-4);opacity:.6}.upload-title{font-size:var(--text-lg);font-weight:var(--font-semibold);margin-bottom:var(--space-2)}.upload-subtitle{font-size:var(--text-sm);color:var(--color-text-secondary);margin-bottom:var(--space-4)}.upload-formats{display:inline-flex;gap:var(--space-2);font-size:var(--text-xs)}.upload-formats span{background:var(--color-bg-tertiary);padding:var(--space-1) var(--space-2);border-radius:var(--radius-sm);color:var(--color-text-secondary)}.upload-preview{display:flex;align-items:center;gap:var(--space-4)}.upload-preview img{width:80px;height:80px;object-fit:cover;border-radius:var(--radius-md);border:1px solid var(--color-border)}.upload-preview-info{flex:1;text-align:left}.upload-preview-name{font-weight:var(--font-medium);margin-bottom:var(--space-1);word-break:break-all}.upload-preview-details{font-size:var(--text-sm);color:var(--color-text-secondary)}.upload-change-btn{font-size:var(--text-sm);color:var(--color-primary);background:none;border:none;padding:var(--space-1) var(--space-2);cursor:pointer}.upload-change-btn:hover{text-decoration:underline}.upload-error{color:var(--color-error);background:var(--color-error-bg);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-size:var(--text-sm);margin-top:var(--space-3);display:none}.upload-error.visible{display:block}.image-info{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3);margin-top:var(--space-4)}.image-info-item{background:var(--color-bg-secondary);border-radius:var(--radius-md);padding:var(--space-3)}.image-info-label{font-size:var(--text-xs);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--space-1)}.image-info-value{font-size:var(--text-sm);font-weight:var(--font-medium)}.image-info-value.dpi-good{color:var(--color-success)}.image-info-value.dpi-bad{color:var(--color-warning)}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text);margin-bottom:var(--space-2)}.form-select,.form-input{width:100%;padding:var(--space-2) var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);color:var(--color-text);font-size:var(--text-sm);transition:border-color var(--transition-fast);-webkit-appearance:auto;-moz-appearance:auto;appearance:auto}.form-select:focus,.form-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.form-input::placeholder{color:var(--color-text-muted)}.form-row{display:flex;gap:var(--space-3);align-items:flex-start}.form-row .form-group{flex:1}.form-hint{font-size:var(--text-xs);color:var(--color-text-muted);margin-top:var(--space-1)}.format-tabs{display:flex;gap:var(--space-1);background:var(--color-bg-secondary);border-radius:var(--radius-md);padding:2px;border:1px solid var(--color-border);margin-bottom:var(--space-3)}.format-tab{flex:1;padding:var(--space-2) var(--space-3);border:none;background:transparent;border-radius:6px;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-secondary);transition:all var(--transition-fast);text-align:center}.format-tab.active{background:var(--color-bg);color:var(--color-text);box-shadow:var(--shadow-sm)}.format-tab:hover:not(.active){color:var(--color-text)}.quality-slider-group{display:flex;align-items:center;gap:var(--space-3)}.quality-slider{flex:1;height:6px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--color-bg-tertiary);border-radius:3px;outline:none}.quality-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:18px;height:18px;background:var(--color-primary);border-radius:50%;cursor:pointer;border:2px solid white;box-shadow:var(--shadow-sm)}.quality-value{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text);min-width:2.5em;text-align:right}.download-btn{width:100%;max-width:400px;padding:var(--space-3) var(--space-6);background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-md);font-size:var(--text-base);font-weight:var(--font-semibold);display:flex;align-items:center;justify-content:center;gap:var(--space-3);transition:all var(--transition-normal);cursor:pointer}.download-btn:hover:not(:disabled){background:var(--color-primary-hover)}.download-btn:disabled{opacity:.4;cursor:not-allowed}.download-btn.processing{background:var(--color-primary-hover)}.download-btn .spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite;display:none}.download-btn.processing .spinner{display:block}.download-btn.processing .btn-text{display:none}.download-btn.processing .btn-loading-text{display:inline}.btn-loading-text{display:none}@keyframes spin{to{transform:rotate(360deg)}}#preview-container{width:100%;max-width:720px}.preview-comparison{margin-top:var(--space-4);display:none}.preview-comparison.visible{display:block}.preview-comparison h3{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text-secondary);margin-bottom:var(--space-3)}.preview-images{display:flex;gap:var(--space-4)}.preview-image-box{flex:1;border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden}.preview-image-box img{width:100%;height:180px;object-fit:contain;background:repeating-conic-gradient(var(--color-bg-tertiary) 0% 25%,transparent 0% 50%) 50% / 20px 20px}.preview-image-box img.loading{background:var(--color-bg-secondary);animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.5}50%{opacity:1}}.preview-image-label{padding:var(--space-2) var(--space-3);font-size:var(--text-xs);color:var(--color-text-secondary);background:var(--color-bg-secondary);text-align:center;border-top:1px solid var(--color-border)}.preview-image-label span{font-weight:var(--font-semibold)}.output-info{padding:var(--space-3);background:var(--color-bg-secondary);border-radius:var(--radius-md);font-size:var(--text-sm);color:var(--color-text-secondary);display:none;max-width:400px;width:100%}.output-info.visible{display:block}.output-info-row{display:flex;justify-content:space-between;margin-bottom:var(--space-1)}.output-info-row:last-child{margin-bottom:0}.footer{border-top:1px solid var(--color-border);padding:var(--space-8) 0;margin-top:var(--space-8)}.footer-inner{display:flex;justify-content:space-between;align-items:center;font-size:var(--text-sm);color:var(--color-text-secondary)}.footer-links{display:flex;gap:var(--space-4)}.footer-links a{color:var(--color-text-secondary)}.footer-links a:hover{color:var(--color-text)}@media(max-width:768px){.footer-inner{flex-direction:column;gap:var(--space-4);text-align:center}}.unit-toggle{display:flex;gap:var(--space-1);background:var(--color-bg-secondary);border-radius:var(--radius-md);padding:2px;border:1px solid var(--color-border)}.unit-btn{padding:var(--space-1) var(--space-2);border:none;background:transparent;border-radius:6px;font-size:var(--text-xs);font-weight:var(--font-medium);color:var(--color-text-secondary);transition:all var(--transition-fast)}.unit-btn.active{background:var(--color-bg);color:var(--color-text);box-shadow:var(--shadow-sm)}.custom-size-section{display:none;margin-top:var(--space-2)}.custom-size-section.visible{display:block}.toast{position:fixed;bottom:var(--space-6);right:var(--space-6);padding:var(--space-3) var(--space-5);border-radius:var(--radius-md);background:var(--color-text);color:#fff;font-size:var(--text-sm);box-shadow:var(--shadow-lg);z-index:var(--z-toast);animation:slideIn .3s ease;max-width:400px}.toast.error{background:var(--color-error)}@keyframes slideIn{0%{transform:translateY(1rem);opacity:0}to{transform:translateY(0);opacity:1}}.hero-section{text-align:center;width:100%;max-width:640px;padding-top:var(--space-4)}.hero-title{font-size:var(--text-2xl);font-weight:var(--font-bold);line-height:1.3;color:var(--color-text);margin:0 0 var(--space-4)}.hero-desc{font-size:var(--text-base);line-height:1.6;color:var(--color-text-secondary);margin:0 0 var(--space-3)}.hero-scenes{font-size:var(--text-sm);color:var(--color-primary);font-weight:var(--font-medium);margin:0}@media(max-width:768px){.preview-images{flex-direction:column}.image-info{grid-template-columns:1fr 1fr}.form-row{flex-direction:column;gap:0}.desktop-only{display:none!important}}@media(min-width:769px){.mobile-only{display:none!important}}