:root{--primary: #2f6bff;--primary-dark: #1f54d6;--primary-soft: #eaf1ff;--danger: #ff3b30;--text: #111111;--text-secondary: #3c3c43;--text-hint: #8e8e93;--border: rgba(60, 60, 67, .12);--bg: #f2f2f7;--card: #ffffff;--canvas: #d8dce6;--shadow: 0 10px 30px rgba(17, 17, 17, .08);--radius: 20px;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,SF Pro Display,PingFang SC,Hiragino Sans GB,Noto Sans SC,Microsoft YaHei,sans-serif;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}button,input,textarea{font:inherit}button{border:0;background:none;padding:0;color:inherit;cursor:pointer}.app-shell{min-height:100dvh}.home{min-height:100dvh;padding:calc(20px + var(--safe-top)) 20px calc(32px + var(--safe-bottom));background:radial-gradient(1200px 420px at 50% -80px,rgba(47,107,255,.08),transparent 60%),var(--bg)}.home-inner{max-width:1080px;margin:0 auto}.brand{display:flex;align-items:center;gap:10px}.brand-mark{display:block;width:36px;height:36px;flex-shrink:0;line-height:0}.brand-mark img{display:block;width:36px;height:36px}.home-heading{margin-bottom:36px}.home-title{margin:0;font-size:28px;letter-spacing:-.03em;font-weight:750;line-height:1.15}.home-features,.home-primary,.convert-grid{display:flex;flex-direction:column;gap:12px}.hero{width:100%;display:flex;align-items:center;gap:14px;text-align:left;background:linear-gradient(90deg,#2f6bff,#5b8cff);color:#fff;border-radius:24px;padding:20px 18px}.hero:active{transform:scale(.985)}.feature-icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;flex-shrink:0}.hero .feature-icon{background:#ffffff2e;color:#fff}.hero-copy{flex:1;min-width:0}.hero-title{font-size:19px;font-weight:750;letter-spacing:-.02em}.hero-desc{margin-top:6px;font-size:13px;color:#ffffffd1;line-height:1.5}.hero .row-chevron{color:#ffffffe6}.section-label{margin:4px 0 10px;font-size:12px;color:var(--text-hint);font-weight:650;letter-spacing:.02em}.more-grid{display:flex;flex-direction:column;gap:12px}.action-row{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--card);border-radius:22px;padding:16px;border:1px solid var(--border)}.action-row:active{transform:scale(.985)}.action-row.dim{opacity:.92}.action-body{flex:1;min-width:0}.action-row .feature-icon{background:var(--primary-soft);color:var(--primary)}.tool-card-title{font-size:16px;font-weight:700;letter-spacing:-.02em}.tool-card-desc{margin-top:6px;font-size:13px;color:var(--text-hint);line-height:1.5}.row-chevron{color:#c5c5ca;display:grid}.badge{display:inline-block;margin-top:8px;padding:3px 8px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:11px;font-weight:650}.home.drag-over .hero{outline:2px dashed rgba(255,255,255,.7);outline-offset:2px}.home-foot{margin-top:28px;color:var(--text-hint);font-size:12px;line-height:1.5;text-align:center}.sheet-note{margin:10px 4px 0;font-size:12px;color:var(--text-hint);line-height:1.5}.toast{position:fixed;left:50%;bottom:calc(28px + var(--safe-bottom));transform:translate(-50%);background:#111111eb;color:#fff;padding:10px 16px;border-radius:999px;font-size:13px;z-index:50}.editor{height:100dvh;display:grid;grid-template-rows:auto 1fr auto auto;background:var(--canvas)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:52px;padding:calc(6px + var(--safe-top)) 10px 6px;background:#ffffffdb;-webkit-backdrop-filter:saturate(180%) blur(16px);backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid var(--border)}.topbar-left,.topbar-right{display:flex;align-items:center;gap:4px;min-width:0}.nav-btn{display:inline-flex;flex-direction:row;flex-wrap:nowrap;align-items:center;justify-content:flex-start;gap:0;min-width:0;min-height:44px;padding:0 10px 0 2px;font-size:16px;font-weight:650;line-height:1;color:var(--primary);border-radius:12px;white-space:nowrap}.nav-back{display:inline-flex;flex-direction:row;flex-wrap:nowrap;align-items:center;gap:2px;height:44px;white-space:nowrap;line-height:1}.nav-chevron-icon{display:block;width:10px;height:16px;flex:0 0 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translateY(-4px);border:6px solid transparent;border-bottom-color:#111111e6;opacity:0;pointer-events:none;z-index:41;transition:opacity .12s ease,transform .12s ease}@media(hover:hover){.icon-btn:hover:not(:disabled){color:var(--primary);background:var(--primary-soft)}.icon-tip:hover:after,.icon-tip:hover:before{opacity:1;transform:translate(-50%) translateY(0)}}.icon-tip:focus-within:after,.icon-tip:focus-within:before{opacity:1;transform:translate(-50%) translateY(0)}.file-name{max-width:42vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700;font-size:16px;line-height:1}.export-btn{min-height:36px;padding:0 14px;border-radius:999px;background:var(--primary);color:#fff;font-weight:700}.preview-area{min-height:0;display:grid;place-items:center;padding:16px 12px;position:relative;overflow:hidden;touch-action:pan-y}.page-stage{position:relative;background:#fff;border-radius:4px;box-shadow:0 18px 40px #11111129;max-width:100%;max-height:100%}.page-stage 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svg{color:var(--text)}.tool:active svg{color:var(--primary)}.thumbs{display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;padding:10px 12px calc(12px + var(--safe-bottom));background:#fff;border-top:1px solid var(--border)}.thumb{flex:0 0 auto;width:72px;scroll-snap-align:start;border:2px solid transparent;border-radius:12px;padding:4px;background:#f2f2f7}.thumb.active{border-color:var(--primary);background:var(--primary-soft)}.thumb canvas{display:block;width:60px;height:auto;border-radius:6px;background:#fff}.thumb-index{display:block;text-align:center;font-size:11px;color:var(--text-hint);margin-top:4px;font-weight:650}.sheet-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000052;z-index:20}.sheet{position:fixed;left:0;right:0;bottom:0;background:#f2f2f7;border-radius:22px 22px 0 0;padding:8px 12px calc(12px + var(--safe-bottom));z-index:21}.sheet-grabber{width:36px;height:5px;border-radius:999px;background:#c7c7cc;margin:6px auto 12px}.sheet h3{margin:0 0 10px;text-align:center;font-size:13px;color:var(--text-hint);font-weight:650}.sheet-group{overflow:hidden;border-radius:14px;background:#fff}.sheet-item,.sheet-cancel{width:100%;min-height:52px;display:flex;align-items:center;gap:12px;text-align:left;padding:0 14px;background:#fff;font-size:17px}.sheet-item-stack{flex-direction:column;align-items:stretch;justify-content:center;min-height:62px;padding:10px 14px;gap:3px}.sheet-item-row{display:flex;align-items:baseline;justify-content:space-between;gap:12px;width:100%}.sheet-item-meta{color:var(--text-hint);font-size:13px;font-weight:550;white-space:nowrap}.sheet-item-sub{font-size:12px;color:var(--text-hint);font-weight:500}.ad-lead{margin-top:0;text-align:center}.ad-slot{display:grid;place-items:center;min-height:120px;margin:12px 4px 0;border-radius:14px;background:#d8dce6;color:#8e8e93;font-size:14px;font-weight:650;letter-spacing:.08em}.ad-count{margin:10px 4px 0;text-align:center;font-size:13px;color:var(--text-secondary)}.ad-export{display:block;width:calc(100% - 8px);margin:12px 4px 0}.sheet-item{border-bottom:1px solid var(--border)}.sheet-group .sheet-item:last-child{border-bottom:0}.sheet-cancel{margin-top:8px;justify-content:center;border-radius:14px;color:var(--text-secondary);font-weight:650}.sheet textarea{width:100%;border:0;border-radius:14px;padding:14px;resize:vertical;background:#fff;min-height:120px}.ann{position:absolute;border:1.5px dashed transparent;cursor:move;touch-action:none}.ann.selected{border-color:var(--primary)}.ann.replace{background:#fff;overflow:hidden;display:flex;align-items:center}.ann.replace .ann-text{white-space:nowrap;line-height:1.1;overflow:hidden}.text-hit{position:absolute;border:1.5px solid rgba(47,107,255,.55);background:#2f6bff1a;padding:0;border-radius:2px;z-index:3;cursor:pointer}.ann-text{width:100%;height:100%;overflow:hidden;line-height:1.3;-webkit-user-select:none;user-select:none}.ann-image{width:100%;height:100%;object-fit:contain;pointer-events:none}.ann-handle{position:absolute;right:-8px;bottom:-8px;width:18px;height:18px;border-radius:50%;background:var(--primary);border:2px solid #fff}.subpage{min-height:100dvh;display:grid;grid-template-rows:auto 1fr auto;background:var(--bg)}.sig-canvas-wrap{margin:12px 16px;background:#fff;border-radius:18px;position:relative;overflow:hidden;box-shadow:var(--shadow)}.sig-canvas-wrap canvas{width:100%;height:100%;display:block}.sig-hint{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;color:#c7c7cc;pointer-events:none}.danger-btn,.ghost-btn,.primary-btn{margin:12px 16px calc(16px + 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auto;padding:24px 20px}.coming p{color:var(--text-secondary);line-height:1.7}.coming code{background:#eceff8;padding:1px 6px;border-radius:6px}.coming .primary-btn{display:block;width:100%;max-width:280px;margin:20px 0 0}.web-form{max-width:560px;margin:0 auto;padding:28px 20px}.web-label{display:block;font-size:13px;font-weight:650;color:var(--text-secondary);margin-bottom:8px}.web-input{width:100%;min-height:48px;border:1px solid var(--border);border-radius:14px;padding:0 14px;background:#fff}.web-input:focus{outline:2px solid rgba(47,107,255,.28);border-color:var(--primary)}.web-submit{display:block;width:100%;margin:16px 0 0}.web-note{margin:14px 0 0;color:var(--text-hint);font-size:13px;line-height:1.55}.web-progress{margin-top:14px}.web-progress-track{height:6px;border-radius:999px;background:#e5e7ee;overflow:hidden}.web-progress-bar{height:100%;border-radius:inherit;background:var(--primary);transition:width .35s ease}.web-progress-copy{display:flex;justify-content:space-between;gap:12px;margin-top:8px;font-size:13px;color:var(--text-secondary)}.web-progress-eta{color:var(--text-hint);flex-shrink:0}.hint-desktop{display:none}@media(min-width:900px){.home{padding:52px 40px 56px}.brand{gap:14px}.brand-mark,.brand-mark img{width:48px;height:48px}.home-heading{margin-bottom:48px}.home-title{font-size:40px;letter-spacing:-.045em}.home-features{gap:18px}.home-primary{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:18px;align-items:stretch}.convert-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.hero{min-height:188px;padding:26px 24px}.hero-title{font-size:22px}.hero-desc{margin-top:8px;font-size:14px}.feature-icon{width:52px;height:52px;border-radius:16px}.hero:hover{transform:translateY(-1px)}.action-row{min-height:188px;flex-direction:column;align-items:flex-start;padding:22px}.tool-card-title{font-size:18px}.tool-card-desc{margin-top:8px;font-size:14px}.action-row:hover{background:#fafafa;border-color:#2f6bff2e}.action-row .row-chevron{display:none}.editor{grid-template-columns:148px 1fr;grid-template-rows:auto 1fr auto}.topbar{grid-column:1 / -1;padding-left:16px;padding-right:16px}.file-name{max-width:420px}.thumbs{grid-row:2;grid-column:1;flex-direction:column;overflow-x:hidden;overflow-y:auto;scroll-snap-type:y proximity;border-top:0;border-right:1px solid var(--border);padding:16px 14px;background:#eef0f5}.thumb{width:100%}.thumb canvas{width:100%}.thumb:hover{border-color:#2f6bff59}.preview-area{grid-column:2;padding:28px}.page-stage canvas{max-width:min(52vw,680px,100%)}.toolbar{grid-column:2;justify-self:center;width:max-content;margin:0 0 22px;padding:6px;border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);background:#fffffff5}.tool{width:84px;min-height:64px;border-radius:14px}.tool:hover{background:var(--primary-soft);color:var(--primary)}.tool:hover svg{color:var(--primary)}.sheet{left:50%;right:auto;bottom:auto;top:50%;width:420px;transform:translate(-50%,-50%);border-radius:22px;padding:16px;background:#fff;box-shadow:0 24px 80px #00000038}.sheet-grabber{display:none}.sheet h3{font-size:16px;color:var(--text);margin-bottom:14px}.sheet-item{background:#f2f2f7}.hint-desktop{display:inline;color:var(--text-hint);font-size:12px;margin-left:10px}}