:root{--paper:#f4f0e7;--ink:#1b1e23;--blue:#273ef2;--orange:#ff682d;--lime:#d6fb65;--line:#232323;--muted:#60656b;--shadow:6px 6px 0 #1b1e23;--radius:2px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased;font-size:16px}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{outline-offset:3px}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--orange)}.safety-strip{display:flex;justify-content:space-between;align-items:center;background:var(--blue);color:#fff;padding:9px clamp(16px,5vw,76px);font:700 10px/1.25 Arial,sans-serif;letter-spacing:.17em}.spark{font-size:20px;line-height:8px;color:var(--lime)}.strip-right{font-weight:500}.masthead{padding:18px clamp(16px,5vw,76px);display:flex;justify-content:space-between;gap:20px;align-items:center;border-bottom:2px solid var(--ink)}.brand{display:flex;align-items:center;gap:12px;font-weight:900;font-size:23px;letter-spacing:-1.3px;white-space:nowrap}.brand small{display:block;font-size:9px;letter-spacing:.19em;margin-top:4px;font-weight:800}.brand-shape{border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);transform:rotate(-6deg);background:var(--orange);height:44px;width:49px;display:grid;place-items:center;font-size:21px;letter-spacing:-1px}.brand-shape span{color:#fff}.masthead nav{display:flex;gap:clamp(8px,2.3vw,32px);flex-wrap:wrap}.masthead nav a{font-size:13px;font-weight:750}.masthead nav a:hover,.text-link:hover{color:var(--blue)}.nav-cta{white-space:nowrap;background:var(--lime);border:2px solid var(--ink);padding:13px 16px;box-shadow:3px 3px 0 var(--ink);font-weight:900;font-size:12px;letter-spacing:.03em}.nav-cta:hover,.primary-btn:hover{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}main{min-height:65vh}.hero{min-height:570px;border-bottom:2px solid 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var(--ink)}.hero-art:before{content:"";position:absolute;inset:0;opacity:.23;background-image:linear-gradient(#ffffff60 1px,transparent 1px),linear-gradient(90deg,#ffffff60 1px,transparent 1px);background-size:40px 40px}.orange-orbit{position:absolute;border:2px solid var(--orange);border-radius:50%;width:600px;height:600px;opacity:.8;animation:drift 11s linear infinite}.orbit-a{transform:translate(70px,-160px)}.orbit-b{transform:translate(-100px,130px);width:420px;height:420px;animation-duration:15s}.specimen{z-index:1;position:relative;width:min(74%,420px);background:var(--paper);border:2px solid var(--ink);box-shadow:13px 13px 0 #0007;padding:18px;transform:rotate(-6deg);animation:float 5s ease-in-out infinite}.specimen-label{font-size:10px;font-weight:900;letter-spacing:.07em;border-bottom:2px dashed var(--ink);padding-bottom:13px}.specimen-file{height:260px;display:flex;align-items:center;justify-content:center;position:relative}.specimen-file>span:first-child{background:var(--lime);border:3px solid var(--ink);width:142px;height:174px;display:grid;place-items:center;font-size:100px;font-weight:900;box-shadow:7px 7px 0 var(--ink)}.file-corner{position:absolute;top:39px;right:calc(50% - 71px);width:34px;height:34px;background:var(--orange);border-left:3px solid var(--ink);border-bottom:3px solid var(--ink)}.specimen-line{display:flex;align-items:center;justify-content:space-between;gap:8px;border-top:1px solid var(--ink);font-size:10px;padding:11px 0;font-family:monospace}.specimen-line b{font-size:10px}.blue-ink{color:var(--blue)}.floating-tag{position:absolute;z-index:2;background:var(--orange);border:2px solid var(--ink);box-shadow:4px 4px 0 var(--ink);padding:14px;font-weight:900;transform:rotate(9deg);animation:bounce 5s ease-in-out 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var(--ink);padding:16px;margin-top:28px;border-radius:0;background:white}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.guide-card{padding:25px;border:2px solid var(--ink);background:#fffefa;min-height:255px;display:flex;flex-direction:column;gap:12px}.guide-card:hover{background:#fddbc5}.guide-num{font-family:monospace;color:var(--blue);font-weight:900}.guide-card strong{font-size:23px;letter-spacing:-.035em}.guide-card p{line-height:1.48;color:var(--muted);font-size:14px}.guide-card span:last-child{margin-top:auto;font-size:11px;font-weight:900}.workspace{max-width:1160px;margin:54px auto 70px;padding:0 24px}.upload-zone{background:#fffefa;border:3px dashed var(--blue);padding:45px 25px;text-align:center;transition:background .2s,transform .2s}.upload-zone.dragging{background:var(--lime);transform:scale(1.01)}.upload-stamp{width:75px;height:75px;display:grid;place-items:center;font-size:42px;background:var(--orange);border:2px solid var(--ink);box-shadow:5px 5px 0 var(--ink);margin:0 auto 20px}.upload-zone h2{font-size:clamp(25px,3vw,43px);margin:0 0 10px;letter-spacing:-.04em}.upload-zone p{line-height:1.55}.upload-zone input{width:min(420px,100%);padding:14px;background:#d8dcff;border:2px solid var(--ink);margin:12px auto;display:block}.upload-zone .upload-disclaimer{color:var(--muted);font-size:12px}.result-panel{margin-top:28px;border:2px solid var(--ink);background:#fffefa;box-shadow:7px 7px 0 var(--ink);padding:22px}.result-head{display:flex;justify-content:space-between;gap:20px;align-items:center;border-bottom:2px solid var(--ink);padding-bottom:18px;margin-bottom:18px}.result-head h2{margin:0;font-size:26px;letter-spacing:-.04em}.result-head button{border:2px solid var(--ink);background:var(--lime);cursor:pointer;font-weight:900;font-size:12px;padding:10px}.result-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px}.metric{padding:14px;background:#e9edff;border:1px solid var(--ink);overflow-wrap:anywhere}.metric small{font-size:10px;color:var(--muted);display:block;text-transform:uppercase;letter-spacing:.09em;margin-bottom:8px}.metric strong{font-size:13px}.output-block{max-width:100%;max-height:440px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;padding:20px;border:2px solid #c6cad1;background:#f7f7fb;font:13px/1.6 ui-monospace,Consolas,monospace}.table-scroll{overflow:auto;max-height:450px;border:1px solid var(--ink)}.data-table{border-collapse:collapse;width:100%;font-size:13px}.data-table td,.data-table th{padding:9px 12px;text-align:left;border:1px solid #c5c7c9;white-space:nowrap}.data-table th{background:var(--lime);position:sticky;top:0}.notice{background:#fff1d9;border-left:4px solid var(--orange);padding:14px 18px;line-height:1.5;margin:15px 0;font-size:14px}.good-note{background:#e7f7da;border-left-color:#598b23}.file-preview{max-width:100%;max-height:420px;display:block;margin:15px auto;border:1px solid var(--ink)}.media-preview{width:min(100%,640px);margin:15px auto;display:block}.pdf-preview{width:100%;height:540px;border:1px solid var(--ink)}.workspace-warning{margin-top:25px;border-top:2px solid var(--ink);padding-top:17px;font-size:13px;line-height:1.6}.workspace-warning b{font-family:monospace;color:var(--blue)}.reading{max-width:800px;margin:60px auto;padding:0 24px 70px;font-size:17px;line-height:1.75}.reading h2{font-size:30px;line-height:1.15;letter-spacing:-.045em;margin-top:37px}.reading a{color:var(--blue);text-decoration:underline}.guide-steps{counter-reset:guide;list-style:none;padding:0}.guide-steps li{counter-increment:guide;position:relative;padding:22px 20px 22px 70px;border-bottom:1px solid #8b8b8b;line-height:1.5}.guide-steps li:before{content:counter(guide,decimal-leading-zero);position:absolute;left:0;top:20px;font-family:monospace;font-weight:900;color:var(--blue);font-size:22px}.caution{padding:24px;background:#ffe2d2;border-left:5px solid var(--orange);margin:35px 0}.caution strong{font:900 12px/1.2 monospace;letter-spacing:.1em}.caution p{margin-bottom:0}footer{background:var(--ink);color:var(--paper);padding:55px max(20px,5vw);display:flex;flex-direction:column;gap:22px}.footer-mark{font-weight:950;letter-spacing:-.07em;font-size:clamp(46px,6vw,85px);line-height:1}.footer-mark span{color:var(--orange)}.footer-mark .footer-star{color:var(--lime)}.footer-links{display:flex;gap:20px;flex-wrap:wrap}.footer-links a{font-size:13px;font-weight:700}.footer-links a:hover{color:var(--lime)}footer small{color:#b2b3b4}#result-output h3{font-size:22px;letter-spacing:-.03em;margin:23px 0 12px}.copy-btn{font-size:13px;cursor:pointer;padding:11px 14px;background:var(--lime);border:2px solid var(--ink);margin:10px 5px 10px 0}.bin-grid{display:grid;grid-template-columns:repeat(16,minmax(20px,1fr));gap:3px;font-family:monospace;font-size:11px;overflow:auto}.bin-grid span{background:#e6e6ef;text-align:center;padding:8px 1px}@keyframes float{50%{transform:rotate(-3deg) translateY(-12px)}}@keyframes bounce{50%{translate:0 -12px}}@keyframes drift{50%{rotate:10deg}}@media(max-width:1000px){.masthead nav{display:none}.tool-grid{grid-template-columns:repeat(3,1fr)}.quick-grid{grid-template-columns:repeat(2,1fr)}.guide-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:700px){.hero{grid-template-columns:1fr}.hero-copy{padding:60px 20px 45px}.hero-art{height:380px;border-left:0;border-top:2px solid var(--ink)}.specimen{width:61%;padding:12px}.specimen-file{height:170px}.specimen-file>span:first-child{height:130px;width:95px;font-size:67px}.file-corner{top:17px;right:calc(50% - 48px);width:22px;height:22px}.mini-trust{margin-top:40px}.masthead{padding:17px 16px}.brand{font-size:20px}.nav-cta{font-size:10px;padding:11px}.tool-grid{grid-template-columns:repeat(2,1fr)}.quick-grid{grid-template-columns:repeat(2,1fr)}.guide-grid{grid-template-columns:1fr}.section{padding:55px 16px}.tool-card{padding:14px;min-height:210px}.tool-card strong{font-size:16px}.tool-card small{font-size:11px}.note-band{flex-direction:column;align-items:flex-start}.note-band a{margin-left:0}.result-summary{grid-template-columns:1fr}.strip-right{display:none}.result-head h2{font-size:21px}}@media(max-width:420px){.quick-grid{grid-template-columns:1fr}.tool-grid{grid-template-columns:1fr}.quick{min-height:160px}.tool-card{min-height:150px}.hero h1{font-size:51px}.nav-cta{display:none}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;scroll-behavior:auto!important;transition:none!important}}

/* Phase 2: bounded document and spreadsheet reading surfaces */
.advanced-info{display:grid;grid-template-columns:minmax(8rem,1fr) minmax(0,2fr);gap:.55rem 1rem;padding:1rem;border:1px solid var(--line);margin:1rem 0;background:#fff}
.advanced-info dt{font-weight:800}.advanced-info dd{margin:0;overflow-wrap:anywhere}.advanced-reader{max-height:520px;overflow:auto;white-space:pre-wrap;line-height:1.65;overflow-wrap:anywhere}
@media(max-width:600px){.advanced-info{grid-template-columns:1fr}.advanced-info dt{margin-top:.5rem}}

/* Phase 3: keyboard accessibility, responsive navigation, legible long-form support */
.skip-link{position:absolute;left:12px;top:-100px;z-index:9000;background:var(--lime);border:3px solid var(--ink);padding:12px 18px;font-weight:900}.skip-link:focus{top:12px}.longform{max-width:860px}.longform p{margin-bottom:1.25em}.longform h2{scroll-margin-top:30px}.reading code{word-break:break-word;background:#e5e8f5;padding:2px 5px}.masthead nav a:focus-visible,.footer-links a:focus-visible{outline-offset:5px}.practical-section .quick:nth-child(2){background:#c4dcff}.practical-section .quick:nth-child(3){background:#fdbd96}.practical-section .quick:nth-child(4){background:#fffefa}
@media(max-width:1000px){.masthead{flex-wrap:wrap}.masthead nav{display:flex;order:3;width:100%;gap:14px 24px;overflow-x:auto;flex-wrap:nowrap;padding:8px 0 4px;scrollbar-width:thin}.masthead nav a{white-space:nowrap;min-height:34px;display:inline-flex;align-items:center}.masthead .nav-cta{margin-left:auto}}
@media(max-width:420px){.masthead nav{display:flex}.masthead nav a{font-size:12px}}
@media(prefers-reduced-motion:reduce){.floating-tag,.specimen,.orange-orbit{animation:none!important}}