:root{--bg:#fcfaf7;--surface:#fff;--surface-2:#f4efe9;--line:#241e1a1a;--line-strong:#241e1a33;--text:#241e1a;--text-dim:#7c7169;--text-faint:#797067;--accent:#c2374a;--accent-2:#e0663c;--accent-soft:#c2374a1a;--accent-ink:#fff;--gold:#b8802f;--ok:#2e7d5b;--danger:#c0392f;--danger-soft:#c2374a1f;--shadow:0 24px 60px #3c2a221f;--shadow-soft:0 12px 32px #3c2a2214;--accent-gradient:linear-gradient(135deg, #e0663c, #c2374a);--page-glow:radial-gradient(120% 55% at 50% 0%, #e0663c1a, transparent 62%);color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;font-family:PingFang SC,Microsoft YaHei,Noto Sans CJK SC,system-ui,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--page-glow), var(--bg);min-width:320px;min-height:100vh;margin:0}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline-offset:3px;outline:3px solid #e5a06f57}.app-shell{min-height:100vh;overflow:hidden}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;width:min(1180px,100% - 48px);height:88px;margin:0 auto;display:flex}.brand{color:var(--text);align-items:center;gap:12px;text-decoration:none;display:inline-flex}.brand-mark{width:42px;height:42px;color:var(--accent-ink);background:var(--accent);border-radius:50% 50% 46% 54%;place-items:center;font-family:STSong,SimSun,serif;font-size:22px;display:grid;transform:rotate(-4deg);box-shadow:0 8px 22px #e5a06f42}.brand>span:last-child{align-items:baseline;gap:10px;display:flex}.brand strong{letter-spacing:.12em;font-family:STSong,SimSun,serif;font-size:21px}.brand small{color:var(--text-dim);letter-spacing:.18em;font-size:12px}.header-promise{color:var(--text-dim);letter-spacing:.08em;align-items:center;gap:9px;font-size:13px;display:flex}.header-promise i{background:var(--ok);border-radius:50%;width:7px;height:7px;box-shadow:0 0 0 5px 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#f5efe70f}.section-heading{align-items:flex-start;gap:22px;margin-bottom:36px;display:flex}.step-number{width:44px;height:44px;color:var(--accent);border:1px solid #e5a06f57;border-radius:50%;place-items:center;font-family:Georgia,serif;font-size:13px;display:grid}.section-heading h2{margin:9px 0 8px;font-family:STSong,SimSun,serif;font-size:clamp(30px,3vw,42px);font-weight:500}.section-heading p{color:var(--text-dim);margin:0;font-size:14px}.maker-grid{grid-template-columns:minmax(0,1fr) 310px;gap:24px;display:grid}.upload-panel,.photo-guide{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow-soft);border-radius:16px}.upload-panel{min-height:500px;padding:38px}.empty-upload{border:1px dashed var(--line-strong);text-align:center;background:#221d1a8c;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;min-height:228px;display:flex}.upload-symbol{width:52px;height:52px;color:var(--accent);background:var(--accent-soft);border-radius:50%;place-items:center;display:grid}.upload-symbol svg,.privacy-card svg,.button-icon{fill:none;stroke:currentColor;stroke-width:1.7px;stroke-linecap:round;stroke-linejoin:round;width:22px}.empty-upload h3{margin:18px 0 8px;font-family:STSong,SimSun,serif;font-size:20px;font-weight:600}.empty-upload p{color:var(--text-dim);margin:0;font-size:13px}.photo-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;min-height:228px;display:grid}.photo-thumb,.add-photo-card{border-radius:10px;min-height:228px;position:relative;overflow:hidden}.photo-thumb{background:var(--surface-2)}.photo-thumb 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minmax(0,1fr);align-items:start;gap:28px;display:grid}.master-side{flex-direction:column;gap:12px;padding-top:2px;display:flex}.matted-strip{border:1px solid var(--line);background:var(--surface);border-radius:12px;align-items:center;gap:14px;padding:12px 14px;display:flex}.matted-strip .checker-bg{border-radius:8px;flex:0 0 54px;width:54px;height:54px;overflow:hidden}.matted-strip img{object-fit:contain;width:100%;height:100%}.matted-strip strong{font-size:13px;display:block}.matted-strip span{color:var(--text-dim);font-size:11px}.checker-bg{background-color:var(--surface-2);background-image:linear-gradient(45deg,#f5efe712 25%,#0000 25% 75%,#f5efe712 75%),linear-gradient(45deg,#f5efe712 25%,#0000 25% 75%,#f5efe712 75%);background-position:0 0,10px 10px;background-size:20px 20px}.derive-lead{color:var(--text-dim);letter-spacing:.06em;white-space:nowrap;align-items:center;gap:14px;margin:26px 2px 14px;font-size:12px;display:flex}.derive-lead i{background:var(--line);flex:1;height:1px}.derive-cards{flex-direction:column;gap:12px;display:flex}.derive-card{border:1px solid var(--line);background:var(--surface);color:var(--text);text-align:left;cursor:pointer;border-radius:14px;align-items:center;gap:16px;padding:18px 20px;transition:transform .18s,box-shadow .18s,border-color .18s;display:flex}.derive-card:hover{box-shadow:var(--shadow-soft);transform:translateY(-2px)}.derive-card.active{border-color:var(--accent);box-shadow:0 14px 36px #c2374a29}.derive-icon{background:var(--accent-soft);border-radius:12px;flex:0 0 44px;place-items:center;width:44px;height:44px;display:grid}.derive-icon svg{fill:none;width:22px;height:22px;stroke:var(--accent);stroke-width:1.6px;stroke-linecap:round;stroke-linejoin:round}.derive-body{flex-direction:column;flex:1;gap:3px;min-width:0;display:flex}.derive-card 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14px;font-size:13px}.spec-search:focus{border-color:var(--accent);outline:none}.spec-chips{flex-wrap:wrap;gap:9px;margin-bottom:22px;display:flex}.spec-chip{border:1px solid var(--line);background:var(--surface);color:var(--text);cursor:pointer;text-align:left;border-radius:10px;flex-direction:column;gap:2px;padding:8px 14px;transition:border-color .15s,background .15s;display:flex}.spec-chip strong{font-size:13px;font-weight:600}.spec-chip span{color:var(--text-dim);font-size:10.5px}.spec-chip:hover{border-color:var(--accent)}.spec-chip.active{border-color:var(--accent);background:var(--accent-soft)}.spec-preview{border-top:1px solid var(--line);grid-template-columns:minmax(0,260px) 1fr;align-items:start;gap:26px;padding-top:20px;display:grid}.spec-canvas{background:var(--surface-2);border-radius:12px;justify-content:center;align-items:center;padding:18px;transition:opacity .15s;display:flex}.spec-canvas[data-loading=true]{opacity:.55}.spec-canvas img{max-width:100%;max-height:340px;box-shadow:var(--shadow-soft);border-radius:4px;display:block}.spec-placeholder{background:var(--surface-2);border-radius:4px;width:140px;height:190px}.spec-meta h3{margin:0 0 4px;font-family:STSong,SimSun,serif;font-size:22px;font-weight:500}.spec-size{color:var(--text-dim);margin:0 0 16px;font-size:12px}.bg-swatches{flex-wrap:wrap;gap:8px;margin-bottom:18px;display:flex}.bg-swatch{border:1px solid var(--line);cursor:pointer;border-radius:8px;width:28px;height:28px;padding:0;transition:transform .15s,box-shadow .15s}.bg-swatch:hover{transform:scale(1.08)}.bg-swatch.active{box-shadow:0 0 0 2px var(--surface), 0 0 0 4px var(--accent)}.spec-checks{color:var(--text-dim);flex-wrap:wrap;gap:8px 16px;margin:0 0 18px;padding:0;font-size:12px;list-style:none;display:flex}.spec-checks .pass{color:var(--ok);font-weight:700}.spec-checks .warn{color:var(--gold);font-weight:700}.spec-warning{color:var(--gold);margin:10px 0 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