:root{--bg-primary:#0a0a0f;--bg-secondary:#111118;--bg-card:#ffffff0a;--bg-card-hover:#ffffff12;--border:#ffffff14;--border-hover:#ffffff2e;--text:#f0f0f5;--text-secondary:#a0a0b8;--text-muted:#606078;--accent:#6c5ce7;--accent-hover:#7f6ff0;--accent-glow:#6c5ce740;--success:#00d68f;--radius:16px;--radius-sm:10px;--radius-xs:6px;--shadow:0 2px 8px #00000040;--shadow-lg:0 8px 32px #0006;--font:"Inter", system-ui, -apple-system, sans-serif;--nav-height:64px;--max-width:820px;--particle-opacity:.5;--checker-light:#ffffff0d;--checker-dark:transparent;--image-bg:#0d0d14;--header-bg:#0a0a0f99}[data-theme=light]{--bg-primary:#f8f9fa;--bg-secondary:#fff;--bg-card:#00000008;--bg-card-hover:#0000000f;--border:#00000014;--border-hover:#00000029;--text:#1a1a24;--text-secondary:#4a4a5a;--text-muted:#808096;--accent:#5849d4;--accent-hover:#473bb0;--accent-glow:#5849d426;--success:#00b377;--checker-light:#0000000a;--checker-dark:#00000003;--image-bg:#eef0f3;--particle-opacity:.2;--header-bg:#f8f9fa99}*,:before,:after{box-sizing:border-box;margin:0;padding:0}[hidden]{display:none!important}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font);background:var(--bg-primary);color:var(--text);-webkit-font-smoothing:antialiased;flex-direction:column;align-items:center;min-height:100vh;line-height:1.5;transition:background .3s,color 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0;border-color:#0000}.btn-ghost:hover{background:var(--bg-card);color:var(--text);border-color:#0000}.btn-group{border:1px solid var(--border);border-radius:var(--radius-sm);gap:0;display:flex;overflow:hidden}.btn-group .btn{color:var(--text-muted);background:0 0;border:none;border-radius:0;min-height:30px}.btn-group .btn.active{background:var(--accent);color:#fff}.btn-group .btn+.btn{border-left:1px solid var(--border)}.btn-group .btn.active+.btn{border-left-color:#0000}@media (width<=480px){.btn-label{display:none}.result-actions .btn{gap:0;padding:8px 12px}}.how-section{width:100%;margin-top:clamp(40px,8vw,64px)}.section-title{text-align:center;color:var(--text);margin-bottom:clamp(20px,4vw,32px);font-size:clamp(1.2rem,3.5vw,1.6rem);font-weight:800}.steps{flex-direction:column;align-items:center;gap:12px;display:flex}@media (width>=600px){.steps{flex-direction:row;justify-content:center;gap:0}}.step{text-align:center;flex:0 180px}.step-num{border:2px solid var(--border);background:var(--bg-card);border-radius:50%;justify-content:center;align-items:center;width:clamp(36px,6vw,44px);height:clamp(36px,6vw,44px);margin:0 auto 10px;font-size:clamp(1rem,2vw,1.2rem);font-weight:800;display:flex}.step-title{margin-bottom:4px;font-size:clamp(.9rem,1.8vw,1rem);font-weight:700}.step-text{color:var(--text-secondary);font-size:clamp(.75rem,1.5vw,.85rem)}.step-connector{background:var(--border);width:3px;height:24px}@media (width>=600px){.step-connector{width:clamp(30px,6vw,60px);height:3px;margin-bottom:46px}}.features{width:100%;margin-top:clamp(40px,8vw,64px)}.features-grid{grid-template-columns:1fr;gap:14px;display:grid}@media (width>=600px){.features-grid{grid-template-columns:repeat(3,1fr);gap:16px}}.feature{text-align:center;background:var(--bg-card);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(18px,3vw,24px) clamp(12px,2vw,16px);transition:transform .2s,border-color .2s}.feature:hover{border-color:var(--accent);transform:translateY(-2px)}.feature svg{width:clamp(20px,4vw,24px);height:auto;margin-bottom:10px}.feature h3{margin-bottom:6px;font-size:clamp(.85rem,1.8vw,.95rem);font-weight:700}.feature p{color:var(--text-secondary);font-size:clamp(.75rem,1.5vw,.85rem);line-height:1.5}.footer{z-index:1;width:100%;max-width:var(--max-width);text-align:center;color:var(--text-muted);border-top:1px solid var(--border);margin-top:clamp(32px,8vw,48px);padding:20px 16px 28px;font-size:clamp(.7rem,1.5vw,.8rem);position:relative}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}html{scroll-behavior:auto}.result-area{animation:none}.pulse-ring,#particles{display:none}}@media (width<=374px){.header-inner{padding:0 12px}.hero{padding-top:20px}.hero-title{font-size:1.5rem}.result-actions{flex-direction:column;width:100%}.result-actions .btn{justify-content:center}}@media (width>=540px){.edit-controls{align-items:flex-end}}@media (width>=768px){.hero-title{font-size:2.6rem}}@media (width>=1024px){.app{padding:0 32px 40px}.hero-title{font-size:2.8rem}}@media (width>=1440px){.app,.header-inner{max-width:900px}.hero-title{font-size:3rem}}@media (width>=1920px){.app,.header-inner{max-width:960px}.hero-title{font-size:3.2rem}}@media (width>=2560px){.app,.header-inner{max-width:1100px}.hero-title{font-size:3.5rem}.hero-sub{font-size:1.15rem}}@media print{#particles{display:none}.header{-webkit-backdrop-filter:none;backdrop-filter:none;position:static}.dropzone{break-inside:avoid}}