:root{--bg:#f7f6f3;--surface:#fff;--surface-soft:#fbfbfa;--border:#eaeaea;--ink:#111;--body:#2f3437;--muted:#787774;--green-bg:#edf3ec;--green-ink:#346538;--blue-bg:#e1f3fe;--blue-ink:#1f6c9f;--yellow-bg:#fbf3db;--yellow-ink:#956400;--red-bg:#fdebec;--red-ink:#9f2f2d;--sans:"LXGW WenKai", -apple-system, "SF Pro Display", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--serif:"LXGW WenKai", "Instrument Serif", "Newsreader", Georgia, "Songti SC", "Noto Serif SC", serif;--mono:"LXGW WenKai Mono", ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;--ease:cubic-bezier(.16, 1, .3, 1)}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{font-family:var(--sans);background:radial-gradient(1100px 520px at 50% -180px, #cbbc9e29, transparent 65%), var(--bg);color:var(--body);min-height:100vh;line-height:1.6}::selection{background:var(--yellow-bg);color:var(--ink)}.ambient{pointer-events:none;z-index:-1;background:radial-gradient(560px 400px at 28% 22%,#d6b67817,#0000 70%);animation:28s ease-in-out infinite alternate drift;position:fixed;inset:-20%}@keyframes drift{to{transform:translate(7%,5%)}}.page{max-width:1024px;margin:0 auto;padding:0 24px}.rise{opacity:0;animation:rise .7s var(--ease) forwards;animation-delay:calc(var(--i) * 90ms)}@keyframes rise{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){.rise,.ambient{opacity:1;animation:none}}.masthead{justify-content:space-between;align-items:center;gap:16px;padding:30px 0 0;display:flex}.wordmark{align-items:center;gap:10px;display:flex}.mark{border-radius:5px;display:block}.mark-text{color:var(--ink);letter-spacing:-.01em;font-weight:700}.mark-mono,.mono-note{font-family:var(--mono);letter-spacing:.09em;color:var(--muted);font-size:.68rem}.badges{gap:8px;display:flex}.tag{letter-spacing:.05em;border-radius:9999px;padding:4px 12px;font-size:.72rem;font-weight:600}.tag-green{background:var(--green-bg);color:var(--green-ink)}.tag-blue{background:var(--blue-bg);color:var(--blue-ink)}.hero{padding:68px 0 44px}h1{color:var(--ink);letter-spacing:-.03em;font-size:clamp(2.3rem,6vw,3.2rem);font-weight:700;line-height:1.1}.hero-serif{font-family:var(--serif);color:var(--muted);letter-spacing:-.02em;margin-top:10px;font-size:clamp(1.25rem,3.2vw,1.7rem);font-style:italic;font-weight:400;display:block}.lede{color:var(--muted);margin-top:20px;font-size:.98rem}.workbench{background:var(--surface);border:1px solid var(--border);border-radius:12px;grid-template-columns:1.7fr 1fr;display:grid;overflow:hidden}.stage{background:var(--surface-soft);cursor:pointer;justify-content:center;align-items:center;min-height:400px;padding:24px;display:flex;position:relative}.stage:after{content:"";pointer-events:none;border:1.5px dashed #d9d5cd;border-radius:8px;transition:border-color .2s;position:absolute;inset:16px}.stage:hover:after,.stage.drag-over:after{border-color:#aaa59b}.stage.drag-over{background:var(--yellow-bg)}.stage.has-image:after{display:none}.stage.has-image{cursor:default}.upload-hint{text-align:center;color:var(--muted);pointer-events:none}.upload-icon{opacity:.45;margin-bottom:12px}.hint-title{color:var(--body);font-weight:600}.hint-sub{margin-top:4px;font-size:.8rem}.stage.has-image .upload-hint{display:none}#stage-img{border:1px solid var(--border);background-image:repeating-conic-gradient(#f1efe9 0 25%, #fff 0 50%);user-select:none;-webkit-user-drag:none;-webkit-touch-callout:none;touch-action:manipulation;cursor:grab;background-size:16px 16px;border-radius:8px;max-width:100%;max-height:56vh;display:none}.stage.has-image #stage-img{display:block}.compare-chip{background:var(--surface);border:1px solid var(--border);color:var(--muted);letter-spacing:.02em;opacity:0;pointer-events:none;border-radius:9999px;align-items:center;gap:6px;padding:5px 13px;font-size:.74rem;transition:opacity .25s;display:flex;position:absolute;bottom:18px;left:50%;transform:translate(-50%);box-shadow:0 2px 8px #0000000a}.stage.has-image:hover .compare-chip{opacity:1}.busy-veil{-webkit-backdrop-filter:blur(3px);color:var(--body);z-index:5;background:#f7f6f3c7;flex-direction:column;justify-content:center;align-items:center;gap:12px;font-size:.86rem;font-weight:500;display:none;position:absolute;inset:0}.busy-veil.is-visible{display:flex}.spinner{border:2.5px solid var(--border);border-top-color:var(--ink);border-radius:50%;width:26px;height:26px;animation:.9s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.panel{border-left:1px solid var(--border);flex-direction:column;gap:22px;padding:28px 24px;display:flex}.meta-label{font-family:var(--mono);letter-spacing:.09em;color:var(--muted);text-transform:uppercase;font-size:.68rem}.meta-block{border-bottom:1px solid var(--border);padding-bottom:18px}.meta-name{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;margin-top:8px;font-size:.92rem;font-weight:600;overflow:hidden}.meta-dims{font-family:var(--mono);color:var(--muted);margin-top:3px;font-size:.76rem}.actions{flex-direction:column;gap:10px;display:flex}.btn{width:100%;font-family:var(--sans);cursor:pointer;border:1px solid #0000;border-radius:6px;justify-content:center;align-items:center;gap:8px;padding:11px 16px;font-size:.92rem;font-weight:600;transition:background .2s,border-color .2s,color .2s,transform .15s;display:flex}.btn:disabled{opacity:.38;cursor:not-allowed}.btn:active:not(:disabled){transform:scale(.98)}.btn-primary{background:var(--ink);color:#fff}.btn-primary:hover:not(:disabled){background:#333}.btn-outline{background:var(--surface);border-color:var(--border);color:var(--body)}.btn-outline:hover:not(:disabled){background:var(--surface-soft);border-color:#d5d2cb}.btn-ghost{color:var(--muted);background:0 0}.btn-ghost:hover:not(:disabled){color:var(--ink);background:var(--surface-soft)}.panel-note{color:var(--muted);background:var(--yellow-bg);border-radius:8px;margin-top:auto;padding:12px 14px;font-size:.76rem;line-height:1.65}.history{margin-top:36px}.history-head{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.mono-note{margin-left:8px}.link-btn{font-family:var(--sans);color:var(--muted);cursor:pointer;text-underline-offset:3px;background:0 0;border:none;font-size:.78rem;text-decoration:underline}.link-btn:hover{color:var(--red-ink)}.history-row{scrollbar-width:thin;gap:10px;padding-bottom:6px;display:flex;overflow-x:auto}.history-empty{color:var(--muted);font-size:.8rem}.history-thumb{border:1px solid var(--border);cursor:pointer;background:var(--surface);width:72px;height:72px;transition:transform .2s var(--ease), box-shadow .2s;border-radius:8px;flex:0 0 72px;padding:0;overflow:hidden}.history-thumb:hover{transform:translateY(-2px);box-shadow:0 2px 8px #0000000a}.history-thumb img{object-fit:cover;width:100%;height:100%;display:block}.how{grid-template-columns:repeat(3,1fr);gap:16px;margin-top:72px;display:grid}.how-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:28px 24px}.step-chip{width:30px;height:30px;font-family:var(--mono);border-radius:6px;justify-content:center;align-items:center;margin-bottom:14px;font-size:.72rem;font-weight:700;display:inline-flex}.chip-yellow{background:var(--yellow-bg);color:var(--yellow-ink)}.chip-blue{background:var(--blue-bg);color:var(--blue-ink)}.chip-green{background:var(--green-bg);color:var(--green-ink)}.how-card h2{color:var(--ink);letter-spacing:-.01em;margin-bottom:8px;font-size:.98rem;font-weight:700}.how-card p{color:var(--muted);font-size:.84rem}footer{text-align:center;color:var(--muted);flex-direction:column;gap:8px;margin:84px 0 44px;font-size:.8rem;display:flex}#toast-root{z-index:100;flex-direction:column;align-items:center;gap:8px;display:flex;position:fixed;top:20px;left:50%;transform:translate(-50%)}.toast{background:var(--surface);border:1px solid var(--border);color:var(--body);animation:toast-in .3s var(--ease);white-space:nowrap;border-radius:8px;align-items:center;gap:8px;padding:9px 16px;font-size:.84rem;display:flex;box-shadow:0 4px 16px #0000000f}.toast-out{animation:.26s forwards toast-out}@keyframes toast-in{0%{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:none}}@keyframes toast-out{to{opacity:0;transform:translateY(-8px)}}@media (width<=860px){.hero{padding:48px 0 36px}.workbench{grid-template-columns:1fr}.panel{border-left:none;border-top:1px solid var(--border)}.actions{grid-template-columns:1fr 1fr;display:grid}.how{grid-template-columns:1fr}.stage{min-height:300px}}