:root{--usat-bg:#f4f1e9;--usat-paper:#fffefa;--usat-ink:#171915;--usat-muted:#66665f;--usat-line:#d7d2c6;--usat-accent:#e45a2a;--usat-deep:#1f493d;--usat-soft:#ece7db;--usat-ok:#2f6b54;--usat-warn:#9b4d24}
.usat-shell{max-width:1120px;margin:0 auto;padding:22px 24px 72px;color:var(--usat-ink);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP","Yu Gothic",Meiryo,sans-serif;line-height:1.75}.usat-shell *{box-sizing:border-box}.usat-shell a{text-decoration:none}.usat-nav{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:6px 0 20px;border-bottom:1px solid var(--usat-line)}.usat-brand{display:grid;grid-template-columns:14px auto;column-gap:9px;align-items:center;color:var(--usat-ink)}.usat-brand-dot{width:12px;height:12px;border-radius:50%;background:var(--usat-accent);grid-row:1/3}.usat-brand b{font-size:20px;letter-spacing:.02em;line-height:1.2}.usat-brand small{font-size:11px;color:var(--usat-muted);line-height:1.3}.usat-navlinks{display:flex;gap:19px;flex-wrap:wrap}.usat-navlinks a{font-size:13px;font-weight:700;color:var(--usat-muted)}.usat-navlinks a:hover{color:var(--usat-ink)}
.usat-hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.65fr);gap:48px;align-items:center;padding:72px 0 62px;border-bottom:1px solid var(--usat-line)}.usat-kicker{margin:0 0 11px;font-size:13px;font-weight:800;letter-spacing:.08em;color:var(--usat-deep)}.usat-hero h1,.usat-tool-hero h1{margin:0;font-family:"Yu Mincho","Hiragino Mincho ProN","Noto Serif JP",serif;line-height:1.22;letter-spacing:-.025em;font-weight:700}.usat-hero h1{font-size:clamp(44px,6vw,76px)}.usat-hero h1 em,.usat-tool-hero h1 em{font-style:normal;text-decoration:underline;text-decoration-thickness:.12em;text-decoration-color:#f0a382;text-underline-offset:.14em}.usat-lead{font-size:17px;color:#44453f;max-width:690px;margin:24px 0 0}.usat-hero-points{display:flex;gap:8px;flex-wrap:wrap;margin-top:27px}.usat-hero-points span,.usat-status{font-size:12px;border:1px solid var(--usat-line);padding:5px 10px;background:rgba(255,255,255,.45)}.usat-hero-art{height:310px;position:relative;background:var(--usat-deep);overflow:hidden}.usat-art-sheet{position:absolute;width:170px;height:210px;background:var(--usat-paper);left:52px;top:42px;transform:rotate(-4deg);box-shadow:10px 12px 0 rgba(0,0,0,.12);padding:40px 23px}.usat-art-sheet i{display:block;height:5px;background:#d4d0c5;margin:0 0 19px}.usat-art-sheet strong{position:absolute;right:21px;bottom:20px;font-size:58px;line-height:1;color:var(--usat-accent);font-family:Georgia,serif}.usat-art-clock{position:absolute;width:115px;height:115px;border:13px solid var(--usat-bg);border-radius:50%;right:25px;top:28px}.usat-art-clock:before,.usat-art-clock:after{content:"";position:absolute;left:50%;top:50%;background:var(--usat-bg);transform-origin:bottom center}.usat-art-clock:before{width:4px;height:34px;transform:translate(-2px,-34px) rotate(15deg)}.usat-art-clock:after{width:4px;height:25px;transform:translate(-2px,-25px) rotate(120deg)}.usat-art-box{position:absolute;width:94px;height:75px;background:var(--usat-accent);right:37px;bottom:40px;transform:skewY(-8deg)}
.usat-tool-list{padding:66px 0 20px}.usat-section-head{display:flex;align-items:end;gap:24px;margin-bottom:22px}.usat-section-head p,.usat-mini{font-size:12px;font-weight:800;letter-spacing:.08em;color:var(--usat-deep);margin:0}.usat-section-head h2,.usat-principle h2,.usat-explain h2,.usat-sources h2{margin:0;font-size:28px;line-height:1.35}.usat-tool-card{display:grid;grid-template-columns:64px 1fr auto;gap:20px;align-items:center;color:var(--usat-ink);padding:24px 2px;border-top:1px solid var(--usat-line);transition:.18s}.usat-tool-card:last-child{border-bottom:1px solid var(--usat-line)}.usat-tool-card:hover{padding-left:10px}.usat-num{font-family:Georgia,serif;font-size:31px;color:#b6b0a5}.usat-chip{font-size:11px;font-weight:800;color:var(--usat-deep)}.usat-tool-card h3{margin:2px 0 2px;font-size:25px}.usat-tool-card p{margin:0;color:var(--usat-muted);font-size:14px}.usat-tool-card>b{font-size:13px;white-space:nowrap;color:var(--usat-accent)}.usat-tool-card.hot .usat-num{color:var(--usat-accent)}.usat-principle{margin-top:68px;padding:42px 0;border-top:4px solid var(--usat-ink);border-bottom:1px solid var(--usat-line);display:grid;grid-template-columns:1fr 1fr;gap:50px}.usat-principle>p{margin:0;color:var(--usat-muted)}.usat-update-strip{padding-top:28px}.usat-update-strip>div{display:flex;gap:15px 24px;flex-wrap:wrap;font-size:12px;color:var(--usat-muted)}.usat-update-strip b{color:var(--usat-ink)}
.usat-tool-hero{display:grid;grid-template-columns:1fr 220px;gap:40px;align-items:center;padding:54px 0 44px;border-bottom:1px solid var(--usat-line)}.usat-tool-hero h1{font-size:clamp(36px,5vw,58px)}.usat-status{display:inline-block;margin-top:22px}.usat-tool-mark{height:180px;background:var(--usat-deep);display:flex;align-items:end;gap:13px;padding:25px}.usat-tool-mark span{display:block;flex:1;background:var(--usat-paper)}.usat-tool-mark span:nth-child(1){height:36%}.usat-tool-mark span:nth-child(2){height:61%;background:#f0a382}.usat-tool-mark span:nth-child(3){height:88%}
.usat-calc{display:grid;grid-template-columns:360px 1fr;gap:42px;padding:52px 0;border-bottom:1px solid var(--usat-line)}.usat-formcol{background:var(--usat-paper);border:1px solid var(--usat-line);padding:26px}.usat-formcol h2{font-size:20px;margin:0 0 20px}.usat-formcol label{display:block;font-size:13px;font-weight:700;margin:0 0 16px}.usat-formcol input,.usat-formcol select{width:100%;margin-top:6px;border:1px solid #bdb7aa;background:white;padding:12px 13px;font-size:16px;color:var(--usat-ink);border-radius:0}.usat-formcol small{display:block;font-weight:400;color:var(--usat-muted);margin-top:5px;line-height:1.5}.usat-check{display:flex!important;align-items:flex-start;gap:9px;font-weight:500!important}.usat-check input{width:auto!important;margin-top:5px!important}.usat-run{width:100%;border:0;background:var(--usat-ink);color:white;padding:14px 16px;font-size:15px;font-weight:800;cursor:pointer}.usat-run:hover{background:var(--usat-deep)}.usat-suffix{position:relative}.usat-suffix span{position:absolute;right:12px;top:18px;color:var(--usat-muted)}.usat-result{min-height:360px;display:flex;flex-direction:column;justify-content:center}.usat-empty{text-align:center;color:var(--usat-muted)}.usat-empty b{font-size:24px;color:var(--usat-ink)}.usat-result-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--usat-line);border:1px solid var(--usat-line)}.usat-result-grid article{background:var(--usat-paper);padding:26px}.usat-result-grid span{display:block;font-size:12px;font-weight:800;color:var(--usat-muted);margin-bottom:8px}.usat-result-grid strong{display:block;font-size:30px;line-height:1.25}.usat-result-grid p{font-size:13px;color:var(--usat-muted);margin:8px 0 0}.usat-result-wide{grid-column:1/-1}.usat-result-note{margin-top:14px;padding:14px 0;border-top:1px solid var(--usat-line);font-size:13px;color:var(--usat-muted)}.usat-good{color:var(--usat-ok)}.usat-warning{color:var(--usat-warn)}
.usat-explain{padding:48px 0 16px}.usat-facts{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:22px}.usat-facts article{border-top:3px solid var(--usat-ink);padding-top:14px}.usat-facts b{font-size:17px}.usat-facts p{font-size:13px;color:var(--usat-muted);margin:6px 0}.usat-sources{padding:42px 0;border-top:1px solid var(--usat-line)}.usat-sources h2{margin-bottom:16px}.usat-source{display:block;color:var(--usat-deep);padding:10px 0;border-bottom:1px dotted var(--usat-line);font-size:14px;font-weight:700}.usat-sources>p{font-size:12px;color:var(--usat-muted);margin-top:15px}.usat-next{display:flex;gap:12px 18px;align-items:center;flex-wrap:wrap;padding:25px 0;border-top:4px solid var(--usat-ink)}.usat-next b{font-size:12px;margin-right:8px}.usat-next a{color:var(--usat-deep);font-weight:700;font-size:13px}
@media(max-width:760px){.usat-shell{padding:14px 17px 55px}.usat-nav{align-items:flex-start}.usat-navlinks{display:none}.usat-hero{grid-template-columns:1fr;padding:45px 0 38px;gap:30px}.usat-hero h1{font-size:45px}.usat-hero-art{height:225px}.usat-tool-card{grid-template-columns:48px 1fr;gap:13px}.usat-tool-card>b{grid-column:2}.usat-tool-card p{font-size:13px}.usat-principle{grid-template-columns:1fr;gap:17px}.usat-tool-hero{grid-template-columns:1fr;padding:38px 0 32px}.usat-tool-mark{display:none}.usat-tool-hero h1{font-size:37px}.usat-calc{grid-template-columns:1fr;padding:34px 0;gap:25px}.usat-result{min-height:0}.usat-result-grid{grid-template-columns:1fr}.usat-result-wide{grid-column:auto}.usat-facts{grid-template-columns:1fr;gap:20px}.usat-section-head{display:block}.usat-section-head p{margin-bottom:6px}}

/* v2.1: theme decorations and old-content widgets are kept out of the calculator pages */
.usat-shell h1,.usat-shell h2,.usat-shell h3{background:none!important;border:0!important;box-shadow:none!important;text-shadow:none!important;padding-left:0!important;padding-right:0!important}
.usat-shell h1::before,.usat-shell h1::after,.usat-shell h2::before,.usat-shell h2::after,.usat-shell h3::before,.usat-shell h3::after{content:none!important;display:none!important}
.usat-home-note{margin-top:64px;padding:34px 0;border-top:4px solid var(--usat-ink);border-bottom:1px solid var(--usat-line)}
.usat-home-note h2{margin:0 0 10px;font-size:27px;line-height:1.4}.usat-home-note>p{margin:0;color:var(--usat-muted);max-width:780px}.usat-history-mini{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px;margin-top:22px;font-size:12px;color:var(--usat-muted)}.usat-history-mini b{color:var(--usat-ink);margin-right:7px}
.usat-history{padding:42px 0;border-top:1px solid var(--usat-line)}.usat-history h2{margin:0;font-size:28px}.usat-history-lead{margin:7px 0 20px;color:var(--usat-muted);font-size:13px}.usat-history ol{list-style:none;margin:0;padding:0}.usat-history li{display:grid;grid-template-columns:150px 1fr;gap:24px;padding:17px 0;border-top:1px solid var(--usat-line)}.usat-history time{font-size:12px;color:var(--usat-muted)}.usat-history li b{font-size:14px}.usat-history li p{margin:3px 0 0;color:var(--usat-muted);font-size:13px}
.usat-managed-view .related-entry-heading,.usat-managed-view .related-list,.usat-managed-view .author-box,.usat-managed-view .sns-follow,.usat-managed-view .sns-share,.usat-managed-view .sns-share-message,.usat-managed-view .footer-meta{display:none!important}
@media(max-width:760px){.usat-history-mini{grid-template-columns:1fr}.usat-history li{grid-template-columns:1fr;gap:4px}.usat-home-note{margin-top:48px}}

/* v2.2: stronger topical focus and practical examples */
.usat-secondary-tools{margin:34px 0 0;padding:26px 0;border-top:1px solid var(--usat-line);border-bottom:1px solid var(--usat-line);display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center}
.usat-secondary-tools span{font-size:11px;font-weight:800;color:var(--usat-deep)}.usat-secondary-tools h2{margin:3px 0 5px;font-size:24px}.usat-secondary-tools p{margin:0;color:var(--usat-muted);font-size:13px;max-width:760px}.usat-secondary-tools>a{font-size:13px;font-weight:800;color:var(--usat-accent);white-space:nowrap}
.usat-usecase{padding:34px 0;border-top:1px solid var(--usat-line)}.usat-usecase h2{margin:0 0 10px;font-size:24px}.usat-usecase p{margin:0;max-width:820px;color:#4b4b45}.usat-usecase b{color:var(--usat-ink)}
.usat-batches{margin:18px 0;padding:16px;border:1px solid var(--usat-line);background:#faf8f1;display:grid;grid-template-columns:1fr 90px;gap:8px 10px}.usat-batches>b{grid-column:1/-1;font-size:13px}.usat-batches label{margin:0!important}.usat-result-alert{margin:14px 0 0;padding:12px 14px;border-left:4px solid var(--usat-warn);background:#fff7ef;font-size:13px;color:#5a4337}
@media(max-width:760px){.usat-secondary-tools{grid-template-columns:1fr;gap:12px}.usat-batches{grid-template-columns:1fr 82px}.usat-usecase{padding:28px 0}}

/* v2.3: focus the live page on the calculator, not the old theme chrome */
.usat-hidden{display:none!important}
.usat-managed-view .article-header,
.usat-managed-view .entry-header,
.usat-managed-view .eye-catch-wrap,
.usat-managed-view .date-tags,
.usat-managed-view .post-date,
.usat-managed-view .toc,
.usat-managed-view .toc-widget-box,
.usat-managed-view .entry-title{display:none!important}
.usat-change-watch{margin-top:58px;padding:30px 0;border-top:4px solid var(--usat-ink);border-bottom:1px solid var(--usat-line)}
.usat-change-watch>.usat-mini{margin-bottom:12px}
.usat-change-row{display:grid;grid-template-columns:105px 135px 1fr;gap:14px;padding:12px 0;border-top:1px solid var(--usat-line);font-size:13px;align-items:start}
.usat-change-row time{color:var(--usat-muted);font-variant-numeric:tabular-nums}.usat-change-row b{font-size:13px}.usat-change-row span{color:#4e4b44}
.usat-change-note{margin:14px 0 0;color:var(--usat-muted);font-size:12px;max-width:850px}
.usat-tool-card.hot{position:relative}.usat-tool-card.hot:before{content:"";position:absolute;left:-10px;top:20%;bottom:20%;width:3px;background:var(--usat-accent)}
.usat-result-grid strong{overflow-wrap:anywhere}
@media(max-width:760px){.usat-change-row{grid-template-columns:1fr;gap:3px}.usat-tool-card.hot:before{left:-4px}}

/* v2.5: click-first visual refresh */
.usat-managed-view .usat-shell{width:min(1120px,calc(100vw - 34px));max-width:none;margin-left:50%;margin-right:0;transform:translateX(-50%)}
.usat-hero h1,.usat-tool-hero h1{font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP","Yu Gothic",Meiryo,sans-serif;font-weight:850;letter-spacing:-.035em}
.usat-hero{grid-template-columns:minmax(0,1fr) minmax(360px,.82fr);gap:42px;padding-top:56px}
.usat-hero-image,.usat-tool-visual{margin:0;border:1px solid var(--usat-line);background:var(--usat-paper);overflow:hidden;box-shadow:0 18px 50px rgba(31,33,28,.08)}
.usat-hero-image img,.usat-tool-visual img{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.usat-quick{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:26px 0 0}
.usat-quick a{display:grid;gap:3px;padding:18px 20px;border:1px solid var(--usat-line);background:var(--usat-paper);color:var(--usat-ink);transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}
.usat-quick a:hover{transform:translateY(-2px);border-color:#b9b1a3;box-shadow:0 10px 25px rgba(31,33,28,.06)}
.usat-quick span{font-size:11px;font-weight:800;letter-spacing:.08em;color:var(--usat-deep)}
.usat-quick b{font-size:19px;line-height:1.4}.usat-quick small{font-size:12px;color:var(--usat-muted)}
.usat-tool-hero{grid-template-columns:minmax(0,1fr) 380px;gap:40px;padding-top:42px}
.usat-tool-visual{align-self:center}
.usat-preview{margin-top:20px;padding:13px 15px;border-left:4px solid var(--usat-accent);background:rgba(255,254,250,.7);display:grid;gap:3px;max-width:630px}
.usat-preview span{font-size:12px;color:var(--usat-muted);font-weight:700}.usat-preview b{font-size:18px;line-height:1.45}
.usat-status{margin-top:14px}
.usat-tool-list{padding-top:48px}
.usat-tool-card{padding-top:20px;padding-bottom:20px}.usat-tool-card h3{font-size:23px}
.usat-calc{padding-top:38px}
.usat-formcol{box-shadow:0 10px 28px rgba(31,33,28,.04)}
.usat-run{min-height:48px;font-size:16px}.usat-run:focus-visible,.usat-quick a:focus-visible,.usat-tool-card:focus-visible{outline:3px solid #e6a083;outline-offset:3px}
.usat-result-grid article{min-height:132px}
.usat-result-grid strong{font-variant-numeric:tabular-nums}
@media(max-width:900px){.usat-hero,.usat-tool-hero{grid-template-columns:1fr}.usat-hero-image,.usat-tool-visual{max-width:720px}.usat-quick{grid-template-columns:1fr 1fr 1fr}}
@media(max-width:760px){.usat-managed-view .usat-shell{width:calc(100vw - 22px)}.usat-hero{padding-top:34px}.usat-hero h1{font-size:40px}.usat-tool-hero h1{font-size:35px}.usat-quick{grid-template-columns:1fr;padding-top:18px}.usat-quick a{padding:15px 16px}.usat-tool-visual{display:block}.usat-preview b{font-size:16px}.usat-tool-list{padding-top:38px}}