:root{--bg:#f5f3ef;--ink:#1d2430;--muted:#697386;--line:#d9dde5;--panel:#ffffff;--accent:#0f766e;--accent-dark:#0b5d56;--warn:#b42318;--shadow:0 24px 80px rgba(29,36,48,0.12)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input{font:inherit}.app-shell{--settings-panel-width:360px;--workspace-gap:24px;--shell-padding:28px;--shell-padding-top:8px;min-height:100vh;padding:var(--shell-padding-top) var(--shell-padding) var(--shell-padding)}.app-header{display:flex;justify-content:flex-start;margin-bottom:10px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) var(--settings-panel-width);grid-template-rows:minmax(0,1fr);grid-gap:var(--workspace-gap);gap:var(--workspace-gap);height:min(calc(100dvh - 76px),calc(100vw - var(--shell-padding) - var(--shell-padding) - var(--workspace-gap) - var(--settings-panel-width)));min-height:520px}.preview-panel,.settings-panel{background:var(--panel);border:1px solid rgba(29,36,48,.08);box-shadow:var(--shadow)}.preview-panel{display:grid;place-items:center;overflow:hidden;min-width:0;min-height:0}.settings-panel{display:flex;flex-direction:column;gap:18px;min-height:0;overflow:auto;padding:24px}.panel-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:2px;gap:2px;width:min(420px,100%);padding:2px;border:1px solid var(--line);border-radius:8px;background:rgba(255,255,255,.72);box-shadow:0 8px 22px rgba(29,36,48,.07)}.panel-tabs button{min-height:30px;border:0;border-radius:6px;background:transparent;color:var(--muted);cursor:pointer;font-size:13px;font-weight:800}.panel-tabs button.is-active{background:var(--ink);color:#ffffff}.tab-panel{display:flex;flex:1 1;flex-direction:column;gap:22px}.brand-row{display:flex;align-items:center;gap:14px}.brand-row svg{color:var(--accent)}h1{font-size:25px;line-height:1.1}h1,p{margin:0}.brand-row p,.field span,.file-card span,.metrics,.upload-copy{color:var(--muted)}.upload-zone{display:grid;place-items:center;grid-gap:8px;gap:8px;width:min(560px,calc(100% - 44px));min-height:360px;border:1px dashed #a8b0be;background:#fafafa;cursor:pointer;transition:border-color .16s ease,background .16s ease,transform .16s ease}.secondary-button input,.upload-zone input{display:none}.upload-zone svg{color:var(--accent)}.upload-zone.is-dragging{border-color:var(--accent);background:#eef8f6;transform:scale(1.01)}.upload-title{font-weight:700;font-size:20px}.preview-stage{position:relative;display:grid;place-items:center;width:100%;height:100%;min-width:0;min-height:0;overflow:hidden;padding:24px;background:linear-gradient(45deg,#e9ecef 25%,transparent 0),linear-gradient(-45deg,#e9ecef 25%,transparent 0),linear-gradient(45deg,transparent 75%,#e9ecef 0),linear-gradient(-45deg,transparent 75%,#e9ecef 0);background-position:0 0,0 10px,10px -10px,-10px 0;background-size:20px 20px}.image-frame{position:relative;display:inline-block;line-height:0}.image-frame,.preview-image{max-width:100%;max-height:100%}.preview-image{display:block;width:auto;height:auto;object-fit:contain;-webkit-user-select:none;-moz-user-select:none;user-select:none}.stamp-result-frame{cursor:-webkit-grab;cursor:grab;width:100%;max-width:100%;max-height:100%;aspect-ratio:1;touch-action:none}.stamp-result-frame:active{cursor:-webkit-grabbing;cursor:grabbing}.preview-dim{inset:0;background:rgba(12,18,28,.4)}.grid-overlay,.preview-dim{position:absolute;pointer-events:none}.grid-overlay{display:grid;border:2px solid #ffffff;box-shadow:0 0 0 9999px rgba(12,18,28,.4),0 16px 48px rgba(0,0,0,.22)}.grid-overlay span{min-width:0;min-height:0;border-right:1px solid rgba(255,255,255,.9);border-bottom:1px solid rgba(255,255,255,.9)}.stamp-preview-overlay{display:block;width:100%;height:100%;filter:drop-shadow(0 18px 36px rgba(0,0,0,.28));pointer-events:none}.stamp-preview-outside{fill:rgba(12,18,28,.34)}.file-card{display:flex;align-items:flex-start;gap:12px;padding:12px;border:1px solid var(--line);border-radius:8px;background:#f8fafc}.file-card-main{display:grid;grid-gap:12px;gap:12px;min-width:0;flex:1 1}.file-card-details{display:grid;grid-gap:3px;gap:3px;min-width:0}.file-card-arrow-divider,.file-card-arrow-divider .metrics{position:relative}.file-card-arrow-divider .metrics:before{content:"↓";position:absolute;top:-10px;left:50%;display:grid;place-items:center;width:20px;height:20px;border:1px solid var(--line);border-radius:999px;background:#f8fafc;color:var(--accent);font-size:14px;font-weight:900;transform:translateX(-50%)}.file-card span,.file-card strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.control-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px}.field{display:grid;grid-gap:8px;gap:8px}.field span{font-size:13px;font-weight:700}.field input{width:100%;min-height:42px;padding:0 12px;color:var(--ink);background:#ffffff}.field input,.segmented{border:1px solid var(--line);border-radius:8px}.segmented{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:4px;gap:4px;padding:4px;background:#f8fafc}.segmented button{min-height:36px;border:0;border-radius:6px;background:transparent;color:var(--muted);cursor:pointer;font-size:14px}.segmented button.is-active{background:var(--ink);color:#ffffff}.metrics{display:flex;justify-content:space-between;gap:12px;padding:0;font-size:14px}.file-card .metrics{padding-top:12px;border-top:1px solid var(--line)}.error-message{color:var(--warn);font-weight:700}.stamp-shape-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:8px;gap:8px}.stamp-shape-grid button{display:grid;place-items:center;grid-gap:6px;gap:6px;min-height:88px;border:1px solid var(--line);border-radius:8px;background:#ffffff;color:var(--muted);cursor:pointer}.stamp-shape-grid button.is-active{border-color:var(--accent);background:#eef8f6;color:var(--accent-dark);box-shadow:inset 0 0 0 1px var(--accent)}.stamp-shape-grid span{color:inherit;font-size:12px}.actions{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));grid-gap:10px;gap:10px;margin-top:auto}.primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;border-radius:8px;font-weight:800;cursor:pointer}.primary-button{gap:8px;border:0;background:var(--accent);color:#ffffff}.primary-button:hover{background:var(--accent-dark)}.webm-button{background:#334155}.webm-button:hover{background:#1f2937}.primary-button:disabled{cursor:not-allowed;opacity:.55}.secondary-button{border:1px solid var(--line);padding:0 16px;background:#ffffff;color:var(--ink)}.instructions-section{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);grid-gap:28px;gap:28px;margin-top:28px;padding:28px;border:1px solid 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button{min-height:38px;border:0;border-bottom:2px solid transparent;padding:0 10px;background:transparent;color:var(--muted);cursor:pointer;font-weight:800}.language-footer button.is-active{border-color:var(--accent);color:var(--ink)}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}@media (max-width:920px){.app-shell{--shell-padding:14px}.workspace{height:auto;min-height:auto}.instructions-section,.workspace{grid-template-columns:1fr}.preview-panel{height:clamp(360px,58vh,520px)}}@media (max-width:560px){.settings-panel{padding:18px}.actions,.control-grid{grid-template-columns:1fr}.segmented,.stamp-shape-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.instructions-section{margin-top:18px;padding:18px}}