:root{--brand-primary:#9B59B6;--brand-secondary:#8E44AD;--bg-primary:#ffffff;--bg-secondary:#fafafa;--bg-card:#fafafa;--bg-elevated:#ffffff;--text-primary:#1a1a1a;--text-secondary:#595959;--text-muted:#555555;--text-inverse:#ffffff;--border-color:#e5e5e5;--border-color-hover:#d0d0d0;--border-color-focus:#9B59B6;--btn-upload:#4A90E2;--btn-upload-hover:#357ABD;--btn-process:#27AE60;--btn-process-hover:#229954;--btn-download:#9B59B6;--btn-download-hover:#8E44AD;--btn-preview:#3498DB;--btn-preview-hover:#2980B9;--btn-danger:#E74C3C;--btn-danger-hover:#C0392B;--success:#27AE60;--error:#E74C3C;--warning:#F39C12;--info:#3498DB;--checker-light:#f5f5f5;--checker-dark:#e0e0e0;--shadow-sm:0 2px 4px rgba(0, 0, 0, 0.1);--shadow-md:0 4px 6px rgba(0, 0, 0, 0.1);--shadow-lg:0 10px 15px rgba(0, 0, 0, 0.1);--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.5s ease;--z-dropdown:1000;--z-header:1010;--z-modal:1020;--z-toast:1030}[data-theme=dark]{--bg-primary:#121212;--bg-secondary:#1e1e1e;--bg-card:#252525;--bg-elevated:#2a2a2a;--text-primary:#ffffff;--text-secondary:#e0e0e0;--text-muted:#b8b8b8;--text-inverse:#1a1a1a;--brand-primary:#B580CD;--brand-secondary:#B580CD;--border-color:#4a4a4a;--border-color-hover:#5a5a5a;--border-color-focus:#B580CD;--btn-upload:#2B6AA9;--btn-upload-hover:#2868A5;--btn-process:#1B8548;--btn-process-hover:#198044;--btn-download:#9B59B6;--btn-download-hover:#8E44AD;--btn-preview:#2B6AA9;--btn-preview-hover:#2868A5;--btn-danger:#B53324;--btn-danger-hover:#B03020;--checker-light:#3a3a3a;--checker-dark:#2a2a2a;--shadow-sm:0 2px 4px rgba(0, 0, 0, 0.3);--shadow-md:0 4px 6px rgba(0, 0, 0, 0.3);--shadow-lg:0 10px 15px rgba(0, 0, 0, 0.3);--feature-bg:#f5f5f5;--feature-text:#1a1a1a}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;transition:background-color var(--transition-normal),color var(--transition-normal)}.theme-toggle{position:relative;background:var(--bg-card);border:2px solid var(--border-color);border-radius:50%;width:44px;height:44px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-normal)}.theme-toggle:hover{border-color:var(--border-color-hover);transform:scale(1.05)}.theme-toggle:active{transform:scale(.95)}.theme-toggle svg{width:20px;height:20px;stroke:var(--text-primary);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;position:absolute;transition:opacity var(--transition-normal),transform var(--transition-normal)}.theme-toggle .icon-moon{opacity:1}.theme-toggle .icon-sun{opacity:0}[data-theme=dark] .theme-toggle .icon-moon{opacity:0}[data-theme=dark] .theme-toggle .icon-sun{opacity:1}@media (prefers-reduced-motion:reduce){*{animation-duration:0s!important;animation-iteration-count:1!important;transition-duration:0s!important}html{scroll-behavior:auto}}:focus-visible{outline:2px solid var(--border-color-focus);outline-offset:2px}::selection{background-color:var(--brand-primary);color:var(--text-inverse)}::-moz-selection{background-color:var(--brand-primary);color:var(--text-inverse)}::-webkit-scrollbar{width:12px;height:12px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:6px}::-webkit-scrollbar-thumb:hover{background:var(--border-color-hover)}.text-primary{color:var(--text-primary)}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-success{color:var(--success)}.text-error{color:var(--error)}.text-warning{color:var(--warning)}.text-info{color:var(--info)}.bg-primary{background-color:var(--bg-primary)}.bg-secondary{background-color:var(--bg-secondary)}.bg-card{background-color:var(--bg-card)}.border{border:1px solid var(--border-color)}.border-top{border-top:1px solid var(--border-color)}.border-bottom{border-bottom:1px solid var(--border-color)}.shadow-sm{box-shadow:var(--shadow-sm)}.shadow-md{box-shadow:var(--shadow-md)}.shadow-lg{box-shadow:var(--shadow-lg)}@media print{body{background:#fff;color:#000}.language-selector,.theme-toggle,button,nav{display:none!important}}
.header{background:var(--bg-primary);border-bottom:1px solid var(--border-color);padding:16px 0;position:sticky;top:0;z-index:1000;transition:background-color .3s ease,border-color .3s ease}.header-content{max-width:1200px;margin:0 auto;padding:0 24px;justify-content:space-between;gap:16px}.header-content,.logo,.nav-desktop{display:flex;align-items:center}.logo{text-decoration:none;flex-shrink:0}.logo img{height:60px;width:auto;max-width:100%;object-fit:contain;transition:opacity .3s ease}.logo:hover img{opacity:.85}.nav-desktop{gap:24px;margin-left:auto;margin-right:20px}.tools-dropdown{position:relative}.tools-dropdown-btn{background:0 0;border:1px solid var(--border-color);color:var(--text-secondary);padding:8px 16px;border-radius:6px;font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:8px;cursor:pointer;transition:border-color .2s ease,color .2s ease;white-space:nowrap;width:145px;justify-content:center}.tools-dropdown-btn:hover{border-color:#9b59b6;color:#9b59b6}.tools-dropdown-btn:focus{outline:2px solid #9b59b6;outline-offset:2px}.dropdown-icon{width:12px;height:12px;transition:transform .2s ease;fill:currentColor}.tools-dropdown.open .dropdown-icon{transform:rotate(180deg)}.tools-dropdown-menu{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(-10px);background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.15);min-width:200px;display:none;opacity:0;transition:opacity .2s ease,transform .2s ease;z-index:100;overflow:hidden}.tools-dropdown.open .tools-dropdown-menu{display:block;opacity:1;transform:translateX(-50%) translateY(0)}.dropdown-section{padding:12px 0}.dropdown-section:not(:last-child){border-bottom:1px solid var(--border-color)}.dropdown-header{padding:8px 16px;font-size:11px;font-weight:700;text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px}.dropdown-item{display:flex;align-items:center;gap:10px;padding:10px 16px;color:var(--text-secondary);text-decoration:none;font-size:14px;transition:all .15s ease}.dropdown-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.dropdown-item:focus{background:var(--bg-secondary);color:var(--text-primary);outline:2px solid #9b59b6;outline-offset:-2px}.dropdown-item.active{background:#9b59b6;color:#fff}.dropdown-item.active:hover{background:#8e44ad}.dropdown-divider{height:1px;background:var(--border-color);margin:8px 16px}.hamburger-btn,.mobile-menu{display:none}@media (max-width:991px){.nav-desktop{display:none}.header-content{justify-content:space-between}.logo img{height:50px!important}.nav-menu{margin-left:auto}.theme-toggle{display:none!important}}@media (max-width:768px){.header-content{padding:0 16px}.logo img{height:45px!important}}@media (max-width:480px){.header{padding:12px 0}.header-content{padding:0 12px}.logo img{height:40px!important}}@media (max-width:320px){.logo img{height:36px!important}}.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;background:var(--bg-primary);border-top:1px solid var(--border-color);z-index:1000;padding:8px 0;padding-bottom:calc(8px + env(safe-area-inset-bottom))}.bottom-nav-items{display:flex;justify-content:space-around;align-items:center;max-width:500px;margin:0 auto}.bottom-nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 12px;text-decoration:none;color:var(--text-secondary);font-size:11px;font-weight:500;transition:color .2s ease;min-width:64px}.bottom-nav-item svg{width:24px;height:24px;stroke-width:1.5;transition:transform .2s ease}.bottom-nav-item:hover{color:var(--text-primary)}.bottom-nav-item:hover svg{transform:scale(1.1)}.bottom-nav-item.active{color:#9b59b6}.bottom-nav-item.active svg{stroke-width:2}@media (max-width:991px){.bottom-nav{display:block}.hamburger-btn,.mobile-menu,.mobile-menu-backdrop{display:none!important}.logo{position:static;transform:none}body{padding-bottom:calc(70px + env(safe-area-inset-bottom))}}[data-theme=dark] .tools-dropdown-menu{box-shadow:0 8px 24px rgba(0,0,0,.4)}[data-theme=dark] .bottom-nav{box-shadow:0-2px 10px rgba(0,0,0,.3)}.bottom-nav-item:focus-visible,.dropdown-item:focus-visible,.tools-dropdown-btn:focus-visible{outline:2px solid #9b59b6;outline-offset:2px}@media (prefers-reduced-motion:reduce){.bottom-nav-item svg,.dropdown-icon,.tools-dropdown-menu{transition:none}}@media (prefers-contrast:high){.tools-dropdown-btn{border-width:2px}.bottom-nav{border-top-width:2px}}
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var(--transition-fast)}.language-btn:hover{background-color:var(--bg-secondary);border-color:var(--border-color-hover)}.language-btn .flag{font-size:18px;line-height:1}.language-dropdown{position:absolute;top:calc(100% + 8px);right:0;background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;box-shadow:var(--shadow-lg);min-width:200px;max-height:400px;overflow-y:auto;z-index:var(--z-dropdown);display:none}.language-dropdown.active{display:block}.language-option{display:flex;align-items:center;gap:10px;padding:10px 16px;cursor:pointer;transition:background-color var(--transition-fast);border-bottom:1px solid var(--border-color)}.language-option:last-child{border-bottom:none}.language-option:hover{background-color:var(--bg-secondary)}.language-option.selected{background-color:var(--brand-primary);color:#fff}.language-option .flag{font-size:20px}.language-option 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12px;background-color:var(--success);color:#fff;border-radius:6px;font-size:13px;font-weight:600;margin-top:12px}.transparency-indicator svg{width:16px;height:16px}.size-indicator{position:absolute;top:12px;left:12px;background-color:var(--info);color:#fff;padding:6px 12px;border-radius:6px;font-size:13px;font-weight:600;font-family:monospace;z-index:10;pointer-events:none}.spinner{border:3px solid var(--bg-secondary);border-top:3px solid var(--brand-primary);border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.loading-text{margin-top:16px;color:var(--text-secondary);font-weight:500}.alert{padding:16px 20px;border-radius:8px;margin-bottom:20px;display:flex;align-items:center;gap:12px;font-size:14px;font-weight:500}.alert-success{background-color:rgba(39,174,96,.1);color:var(--success);border:1px solid var(--success)}.alert-error{background-color:rgba(231,76,60,.1);color:var(--error);border:1px solid var(--error)}.alert-warning{background-color:rgba(243,156,18,.1);color:var(--warning);border:1px solid var(--warning)}.alert-info{background-color:rgba(52,152,219,.1);color:var(--info);border:1px solid var(--info)}.faq-item{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;margin-bottom:16px;overflow:hidden;transition:all var(--transition-fast)}.faq-item:hover{box-shadow:var(--shadow-sm)}.faq-question{padding:20px;cursor:pointer;font-weight:600;color:var(--text-primary);display:flex;justify-content:space-between;align-items:center;gap:16px;user-select:none}.faq-question:hover{background-color:var(--bg-secondary)}.faq-icon{flex-shrink:0;font-size:20px;transition:transform var(--transition-fast)}.faq-item.active .faq-icon{transform:rotate(180deg)}.faq-answer{max-height:0;overflow:hidden;transition:max-height var(--transition-normal)}.faq-item.active .faq-answer{max-height:500px}.faq-answer-content{padding:0 20px 20px;color:var(--text-secondary);line-height:1.6}.feature-box{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:30px;text-align:center;transition:all var(--transition-normal)}[data-theme=dark] .feature-box{background-color:var(--feature-bg);color:var(--feature-text)}.feature-box:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.feature-icon{font-size:48px;margin-bottom:16px;display:block}.feature-title{font-size:20px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}[data-theme=dark] .feature-title{color:var(--feature-text)}.feature-description{font-size:15px;color:var(--text-secondary);line-height:1.6}[data-theme=dark] .feature-description{color:var(--feature-text);opacity:.8}.step-box{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:24px;display:flex;align-items:flex-start;gap:16px;transition:all var(--transition-normal)}[data-theme=dark] .step-box{background-color:var(--feature-bg);color:var(--feature-text)}.step-box:hover{box-shadow:var(--shadow-md)}.step-number{flex-shrink:0;width:36px;height:36px;background-color:var(--brand-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px}.step-content h4{font-size:18px;font-weight:600;color:var(--text-primary);margin-bottom:8px}[data-theme=dark] .step-content h4{color:var(--feature-text)}.step-content p{font-size:14px;color:var(--text-secondary);line-height:1.6}[data-theme=dark] .step-content p{color:var(--feature-text);opacity:.8}@media (max-width:768px){.btn,button{padding:10px 20px;font-size:15px}.upload-area{padding:30px 15px;min-height:250px}.upload-icon{font-size:36px}.upload-text{font-size:16px}.feature-box{padding:20px}.feature-icon{font-size:36px}.step-box{padding:16px;flex-direction:column;text-align:center}.step-number{margin:0 auto}}@media (max-width:480px){.btn-full-mobile{width:100%;display:block}.upload-area{padding:20px 10px;min-height:200px}}
@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateX(-50%) translateY(-20px)}to{opacity:1;transform:translateX(-50%) translateY(0)}}@keyframes iconRotate{0%{transform:rotate(0deg);opacity:0}to{transform:rotate(360deg);opacity:1}}:root{--bg-primary:#ffffff;--bg-secondary:#fafafa;--bg-card:#fafafa;--text-primary:#1a1a1a;--text-secondary:#595959;--text-muted:#707070;--border-color:#d0d0d0;--border-dashed:#bebebe;--shadow-sm:rgba(0, 0, 0, 0.08);--shadow-md:rgba(0, 0, 0, 0.12);--shadow-lg:rgba(0, 0, 0, 0.2);--checkerboard-light:#e8e8e8;--checkerboard-dark:transparent;--gradient-start:#fafafa;--gradient-end:#f5f5f5;--logo-url:url('/assets/images/logo-dark.webp');--disabled-bg:#e5e5e5;--disabled-text:#757575;--overlay-radial:rgba(26, 26, 26, 0.015);--canvas-bg:#1a1a1a;--accent:#2563eb;--accent-hover:#1d4ed8;--accent-contrast:#ffffff;--radius-sm:6px;--radius-md:10px;--radius-lg:12px;--focus-ring:0 0 0 2px rgba(37, 99, 235, 0.25)}[data-theme=dark]{--bg-primary:#121212;--bg-secondary:#1e1e1e;--bg-card:#252525;--text-primary:#ffffff;--text-secondary:#e0e0e0;--text-muted:#b8b8b8;--border-color:#4a4a4a;--border-dashed:#5a5a5a;--shadow-sm:rgba(0, 0, 0, 0.5);--shadow-md:rgba(0, 0, 0, 0.6);--shadow-lg:rgba(0, 0, 0, 0.8);--checkerboard-light:#3a3a3a;--checkerboard-dark:#2a2a2a;--gradient-start:#252525;--gradient-end:#1a1a1a;--logo-url:url('/assets/images/logo-light.webp');--disabled-bg:#353535;--disabled-text:#888888;--overlay-radial:rgba(255, 255, 255, 0.04);--canvas-bg:#0d0d0d;--accent:#60a5fa;--accent-hover:#3b82f6;--accent-contrast:#0b1220}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}.nav-link:hover,body{color:var(--text-primary)}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe 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ease}.nav-link:hover{background:var(--bg-secondary)}.nav-link.active{color:#fff;background:linear-gradient(135deg,#8b5cf6 0,#3b82f6 100%);font-weight:600}.nav-link.disabled{color:#ccc;cursor:not-allowed;position:relative}.nav-link.disabled::after{content:"Soon";font-size:9px;background:#f0f0f0;color:var(--text-muted);padding:2px 6px;border-radius:8px;margin-left:6px;text-transform:uppercase;letter-spacing:.5px}.theme-toggle{background:0 0;border:1px solid var(--border-color);padding:0;font-size:16px;display:flex;align-items:center;justify-content:center;transition:all .3s ease;width:36px;height:36px;position:relative}.theme-toggle:hover{border-color:var(--text-primary);background:var(--bg-secondary);color:var(--text-primary);transform:scale(1.05)}.theme-toggle:active{transform:scale(.95)}.theme-toggle:focus-visible{outline:2px solid var(--text-primary);outline-offset:2px}.theme-icon{display:flex;align-items:center;justify-content:center;line-height:1;transition:opacity .3s ease,transform .3s ease}.theme-icon.moon-icon,.theme-icon.sun-icon{position:absolute}.lang-dropdown{position:relative}.lang-current{background:0 0;border:1px solid var(--border-color);color:var(--text-secondary);padding:6px 12px;border-radius:6px;cursor:pointer;font-size:13px;font-weight:500;display:flex;align-items:center;gap:6px;transition:all .15s;min-width:80px;justify-content:space-between}.lang-current:hover{border-color:var(--text-primary);color:var(--text-primary)}.lang-arrow{font-size:10px;transition:transform .2s}.lang-dropdown.open .lang-arrow{transform:rotate(180deg)}.lang-options{position:absolute;top:calc(100% + 4px);right:0;background:var(--bg-card);border:1px solid var(--border-color);border-radius:6px;box-shadow:0 4px 12px rgba(0,0,0,.1);min-width:120px;display:none;z-index:100;overflow:hidden}.lang-dropdown.open 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h1{font-size:32px;font-weight:600;color:var(--text-primary);letter-spacing:-.5px;margin-bottom:6px;line-height:1.2;transition:color .3s ease}.section-header p{font-size:15px;color:var(--text-secondary);margin:0}.tool-container{background:var(--bg-card);border-radius:16px;box-shadow:0 4px 24px var(--shadow-md);overflow:hidden;border:1px solid var(--border-color)}.upload-area,.upload-content{display:flex;align-items:center}.upload-area{border-radius:12px;margin:16px;padding:80px 24px;text-align:center;cursor:pointer;transition:background-color .2s ease;min-height:500px;justify-content:center}.faq-item summary:hover,.upload-area:hover{background:var(--bg-secondary)}.upload-area,.upload-area.drag-over{border:2px dashed rgba(139,92,246,.5)}.upload-area.drag-over{background:rgba(139,92,246,.1)}.upload-content{flex-direction:column;gap:16px}.upload-icon-circle{width:128px;height:128px;background:linear-gradient(135deg,#8b5cf6 0,#3b82f6 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canvas{max-width:100%;max-height:500px;display:block;border-radius:0}.preview-wrapper{background:linear-gradient(45deg,var(--checkerboard-light) 25%,var(--checkerboard-dark) 25%),linear-gradient(-45deg,var(--checkerboard-light) 25%,var(--checkerboard-dark) 25%),linear-gradient(45deg,var(--checkerboard-dark) 75%,var(--checkerboard-light) 75%),linear-gradient(-45deg,var(--checkerboard-dark) 75%,var(--checkerboard-light) 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0;padding:32px;border:2px dashed rgba(139,92,246,.5)}.preview-wrapper canvas{max-height:400px;box-shadow:0 8px 32px var(--shadow-lg);border-radius:8px}.transparency-indicator{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);font-size:12px;color:#fff;white-space:nowrap;font-weight:600;letter-spacing:.3px;background:linear-gradient(135deg,#1e8449 0,#186a3b 100%);padding:6px 14px;border-radius:16px;z-index:10;box-shadow:0 2px 8px rgba(39,174,96,.3);border:1px solid rgba(255,255,255,.2)}.control-group{background:var(--bg-secondary);border-radius:12px;padding:20px}.control-title{font-size:14px;font-weight:600;color:var(--text-primary);margin:0 0 16px;display:flex;align-items:center;gap:8px}.control-title svg{opacity:.7}.model-buttons{display:flex;flex-direction:column;gap:8px}.btn-model{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--bg-card);border:2px solid var(--border-color);border-radius:8px;font-size:13px;font-weight:500;color:var(--text-primary);cursor:pointer;transition:all .2s ease}.btn-model:hover{background:var(--bg-primary);border-color:var(--text-muted)}.btn-model.active{border-color:#8b5cf6;background:rgba(139,92,246,.1)}.btn-model .model-name{display:flex;align-items:center;gap:8px}.btn-model .model-badge{font-size:10px;padding:2px 6px;border-radius:4px;background:rgba(139,92,246,.2);color:#8b5cf6}.btn-model .model-badge.recommended{background:rgba(34,197,94,.2);color:#22c55e}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:12px;font-weight:500;color:var(--text-secondary);margin-bottom:8px}.form-select{width:100%;padding:10px 12px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;font-size:14px;color:var(--text-primary);cursor:pointer}.form-select:focus{outline:0;border-color:#8b5cf6;box-shadow:0 0 0 3px rgba(139,92,246,.15)}.file-info{background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;padding:12px}.info-row{display:flex;justify-content:space-between;font-size:12px;padding:4px 0}.info-row span{color:var(--text-muted)}.info-row strong{color:var(--text-primary)}.faq-item summary::-webkit-details-marker{display:none}.faq-item[open] summary span:last-child{transform:rotate(45deg)}.rotation-buttons{display:grid;grid-template-columns:1fr 1fr;gap:8px}.btn-rotate{display:flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;background:var(--bg-card);border:1px solid var(--border-color);border-radius:8px;font-size:13px;font-weight:500;color:var(--text-primary);cursor:pointer;transition:all .2s ease}.btn-rotate:hover{background:var(--bg-primary);border-color:var(--text-muted)}.btn-rotate svg{flex-shrink:0}.action-buttons{display:flex;flex-direction:column;gap:8px;margin-top:auto}.btn-primary{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;background:linear-gradient(135deg,#8b5cf6 0,#3b82f6 100%);border:0;border-radius:10px;font-size:14px;font-weight:600;color:#fff;cursor:pointer;transition:all .2s ease;box-shadow:0 4px 16px rgba(139,92,246,.3)}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(139,92,246,.4)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-secondary,.processing-overlay{display:flex;align-items:center;justify-content:center}.btn-secondary{gap:8px;padding:12px 24px;background:0 0;border:1px solid var(--border-color);border-radius:10px;font-size:14px;font-weight:600;color:var(--text-primary);cursor:pointer;transition:all .2s ease}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--text-muted)}.processing-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.7);flex-direction:column;border-radius:12px;z-index:10}.processing-overlay .spinner{width:48px;height:48px;border:4px solid rgba(255,255,255,.3);border-top-color:#8b5cf6;border-radius:50%;animation:spin 1s linear infinite}.processing-overlay .progress-text{color:#fff;font-size:14px;margin-top:16px;font-weight:500}.processing-overlay .progress-bar{width:200px;height:4px;background:rgba(255,255,255,.2);border-radius:2px;margin-top:12px;overflow:hidden}.processing-overlay .progress-fill{height:100%;background:linear-gradient(135deg,#8b5cf6 0,#3b82f6 100%);border-radius:2px;transition:width .3s ease}.how-section{max-width:800px;margin:0 auto 80px}.features-section h2,.how-section h2{font-size:24px;font-weight:600;color:var(--text-primary);margin-bottom:32px;text-align:center;letter-spacing:-.5px;transition:color .3s ease}[data-theme=dark] .features-section h2,[data-theme=dark] .how-section h2{color:#fff!important}.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.step-item{text-align:center;border-radius:var(--radius-md);padding:24px 16px}.step-item,[data-theme=dark] .feature-item,[data-theme=dark] .step-item{background:var(--bg-card);border:1px solid var(--border-color)}.step-number{width:32px;height:32px;background:var(--text-primary);color:var(--bg-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;margin:0 auto 12px;transition:background-color .3s ease,color .3s ease}.feature-item h3,.step-item h3{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.feature-item p,.step-item p{font-size:13px;color:var(--text-secondary);line-height:1.5}.features-section{max-width:900px;margin:0 auto 80px;padding:48px 24px;background:var(--bg-secondary);border-radius:8px;transition:background-color .3s ease}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.feature-item{text-align:center;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:24px 16px}.feature-icon{font-size:28px;margin-bottom:12px}.feature-item h3{font-size:14px;margin-bottom:6px}[data-theme=dark] .feature-item h3,[data-theme=dark] .feature-item p,[data-theme=dark] .step-item h3,[data-theme=dark] .step-item p{color:var(--text-primary)!important}.info-section{max-width:960px;margin:0 auto 64px;padding:0 24px}.info-header{text-align:center;margin-bottom:32px}.info-header h2,.info-tips strong{font-size:24px;margin-bottom:12px;color:var(--text-primary)}.info-card h3,.info-header p{color:var(--text-secondary);font-size:15px}.info-grid,.info-tips ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}.info-card,.info-tips{padding:16px;border-radius:10px;border:1px solid var(--border-color)}.info-card{display:flex;gap:12px;background:var(--bg-card);align-items:center}.info-card .info-icon{font-size:28px}.info-card h3{margin:0 0 4px;color:var(--text-primary)}.info-card p{margin:0}.info-tips{margin-top:24px;background:var(--bg-secondary)}.info-tips strong{display:block;margin-bottom:8px;font-size:14px}.info-tips ul{list-style:none;margin:0;padding:0;gap:12px}.footer 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