@font-face{font-family:SchemaSans;src:url('/assets/fonts/Geist.woff2') format('woff2');font-weight:100 900;font-display:swap}
@font-face{font-family:SchemaMono;src:url('/assets/fonts/GeistMono.woff2') format('woff2');font-weight:100 900;font-display:swap}

/* Schema Labs — "the editor's proof". Warm paper, near-black ink, one red pen reserved for what needs attention. */
:root{
  --paper:#f7f6f2;--paper-2:#efede6;--surface:#fff;--surface-2:#fbfaf7;
  --ink:#141518;--ink-2:#36393e;--muted:#64676c;--faint:#9b9da1;
  --line:#e4e1d8;--line-2:#d2cec3;
  --pen:#c63a1e;--pen-ink:#a3301a;--pen-wash:#fcebe5;--pen-line:#f0c5b8;
  --amber-ink:#875c00;--amber-wash:#f9efd4;--amber-line:#e6d099;
  --green-ink:#21683f;--green-wash:#e6f2ea;--green-line:#b9d9c5;
  --add-bg:#eaf5ee;--add-mark:#2a8352;--del-bg:#fdeee9;--del-mark:#c63a1e;
  --focus:#1f5aa6;
  --tk-key:#141518;--tk-str:#7c4a14;--tk-num:#1f5aa6;--tk-p:#7d8085;
  --radius:12px;--radius-sm:8px;
  --shadow:0 1px 0 rgba(20,21,24,.04),0 1px 2px rgba(20,21,24,.05),0 18px 40px -24px rgba(20,21,24,.22);
  --mono:SchemaMono,ui-monospace,Consolas,monospace;--sans:SchemaSans,system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
  --ease:cubic-bezier(.16,1,.3,1);--gutter:clamp(16px,4vw,40px);--header:64px
}
*,*:before,*:after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header) + 24px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink-2);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;overflow-wrap:break-word}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit;color:inherit}
button,a{touch-action:manipulation}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
[aria-busy=true]{cursor:progress}
svg{display:block}
::selection{background:#f6d3c8;color:var(--ink)}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:4px}
[hidden]{display:none!important}
h1,h2,h3,p,figure{margin:0}
h1,h2,h3{color:var(--ink);text-wrap:balance}
h1{font-size:clamp(2.5rem,1.55rem + 3.3vw,4.5rem);line-height:1;letter-spacing:-.045em;font-weight:620}
h2{font-size:clamp(1.85rem,1.35rem + 1.6vw,2.75rem);line-height:1.08;letter-spacing:-.035em;font-weight:600}
h3{font-size:1.125rem;line-height:1.35;letter-spacing:-.01em;font-weight:600}
code,kbd,pre{font-family:var(--mono)}
.wrap{max-width:1200px;margin-inline:auto;padding-inline:var(--gutter)}
.skip{position:fixed;top:8px;left:8px;background:var(--ink);color:#fff;z-index:50;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border-radius:6px}
.skip:focus{width:auto;height:auto;padding:10px 16px;clip-path:none}

/* Buttons and links */
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 16px;border:1px solid var(--ink);background:var(--ink);color:#fff;font-size:14px;font-weight:560;line-height:1;letter-spacing:-.005em;border-radius:var(--radius-sm);white-space:nowrap;transition:background-color .15s,border-color .15s,color .15s,transform .15s var(--ease)}
.button:hover{background:#2b2d32;border-color:#2b2d32}
.button:active{transform:translateY(1px)}
.button:disabled{opacity:.5}
.button:disabled:active{transform:none}
.button.secondary{background:var(--surface);border-color:var(--line-2);color:var(--ink)}
.button.secondary:hover{background:var(--paper-2);border-color:#c2bdb0}
.button.ghost{background:transparent;border-color:transparent;color:var(--ink-2)}
.button.ghost:hover{background:var(--paper-2);color:var(--ink)}
.button.small{height:34px;padding:0 12px;font-size:13px}
.button.large{height:46px;padding:0 20px;font-size:15px}
.arrow{width:14px;height:14px;stroke:currentColor;stroke-width:1.7;fill:none;transition:transform .2s var(--ease)}
.button:hover .arrow,.text-link:hover .arrow,.sheet-link:hover .arrow{transform:translateX(2px)}
.text-link{display:inline-flex;align-items:center;gap:8px;color:var(--ink);font-size:15px;font-weight:560;text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:5px;text-decoration-thickness:1px;transition:text-decoration-color .15s}
.text-link:hover{text-decoration-color:var(--ink)}
.kicker{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:540;color:var(--muted);letter-spacing:-.005em}
.kicker-mark{width:8px;height:8px;border-radius:2px;background:var(--pen);flex:none}
.lead{font-size:clamp(1.0625rem,1rem + .3vw,1.1875rem);line-height:1.6;color:var(--ink-2);max-width:34em}
.squiggle{text-decoration:underline wavy var(--pen);text-decoration-thickness:max(1.5px,.055em);text-underline-offset:.11em;text-decoration-skip-ink:none}

/* Tags */
.tag{display:inline-flex;align-items:center;gap:6px;height:22px;padding:0 8px;border-radius:999px;border:1px solid var(--line-2);background:var(--surface-2);color:var(--ink-2);font-size:12px;font-weight:560;line-height:1;white-space:nowrap}
.tag:before{content:'';width:6px;height:6px;border-radius:50%;background:currentColor;flex:none}
.tag.lg{height:28px;padding:0 11px;font-size:13.5px}
.tag.breaking,.tag.invalid{background:var(--pen-wash);border-color:var(--pen-line);color:var(--pen-ink)}
.tag.review{background:var(--amber-wash);border-color:var(--amber-line);color:var(--amber-ink)}
.tag.compatible{background:var(--green-wash);border-color:var(--green-line);color:var(--green-ink)}

/* Header */
.site-header{position:sticky;top:0;z-index:30;background:var(--paper);border-bottom:1px solid var(--line)}
.header-inner{height:var(--header);display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:640;letter-spacing:-.025em;color:var(--ink);white-space:nowrap}
.mark{width:24px;height:24px;color:var(--ink)}
.mark .mark-plus{color:var(--pen)}
.nav{display:flex;align-items:center;gap:4px;font-size:14px;font-weight:520}
.nav>a:not(.button){padding:8px 12px;border-radius:6px;color:var(--muted);transition:color .15s,background-color .15s}
.nav>a:not(.button):hover{color:var(--ink);background:var(--paper-2)}
.nav>a[aria-current=page]:not(.button){color:var(--ink)}
.nav .nav-cta{margin-left:12px}
.menu-toggle{display:none;align-items:center;gap:8px;height:36px;padding:0 12px;border:1px solid var(--line-2);background:var(--surface);border-radius:var(--radius-sm);font-size:14px;font-weight:540;color:var(--ink)}
.menu-icon{width:14px;height:10px;position:relative;border-top:1.5px solid currentColor;border-bottom:1.5px solid currentColor}
.menu-icon:after{content:'';position:absolute;left:0;right:0;top:50%;border-top:1.5px solid currentColor;transform:translateY(-50%)}

/* Hero */
.hero{padding-top:clamp(44px,6.5vw,88px);padding-bottom:clamp(56px,7vw,88px)}
.hero-intro{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:28px clamp(40px,5vw,72px);align-items:end;margin-bottom:clamp(36px,4.5vw,56px)}
.hero h1{margin-top:22px;max-width:12.5em;line-height:1.05}
.hero-side{padding-bottom:6px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-facts{list-style:none;padding:0;margin:22px 0 0;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:14px;color:var(--muted)}
.hero-facts li{display:flex;align-items:center;gap:8px}
.hero-facts li:before{content:'';width:14px;height:14px;flex:none;background:no-repeat center/14px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 14' fill='none' stroke='%2321683f' stroke-width='1.6'%3E%3Cpath d='M3 7.2l2.6 2.6L11 4.4'/%3E%3C/svg%3E")}

/* Review sheet (hero product) */
.sheet{min-width:0;background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:10px 12px 10px 16px;border-bottom:1px solid var(--line);background:var(--surface-2)}
.sheet-file{display:flex;align-items:center;gap:10px;min-width:0;font:500 13px/1 var(--mono);color:var(--ink)}
.file-glyph{width:16px;height:16px;fill:none;stroke:var(--muted);stroke-width:1.2;flex:none}
.sheet-versions{color:var(--muted)}
.diffstat{display:inline-flex;gap:6px;font-size:12px;color:var(--muted)}
.stat-add{color:var(--add-mark)}.stat-del{color:var(--del-mark)}
.segmented{display:inline-flex;padding:3px;gap:2px;background:var(--paper-2);border:1px solid var(--line);border-radius:9px}
.segmented button{height:28px;padding:0 12px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-size:13px;font-weight:540;transition:background-color .15s,color .15s}
.segmented button:hover{color:var(--ink)}
.segmented button[aria-pressed=true]{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px rgba(20,21,24,.1),0 0 0 1px rgba(20,21,24,.04)}
.segmented button:disabled{cursor:progress}
.sheet-body{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr)}
.sheet-aside{display:flex;flex-direction:column;min-width:0;border-left:1px solid var(--line);background:var(--surface)}
.diff{font:13px/24px var(--mono);overflow-x:auto;padding:12px 0;min-height:384px;background:var(--surface);scrollbar-width:thin}
.diff:focus-visible{outline-offset:-2px;border-radius:0}
.diff-row{display:flex;align-items:stretch;width:max-content;min-width:100%;background:var(--surface);transition:box-shadow .2s}
.diff-row .ln{width:30px;flex:none;text-align:right;color:var(--faint);font-size:11.5px;user-select:none}
.diff-row .ln+.ln{margin-right:4px}
.diff-row .sign{width:24px;flex:none;text-align:center;color:var(--faint);user-select:none}
.diff-row .src{flex:1;white-space:pre;padding-right:12px;color:var(--ink-2);font:inherit}
.diff-row.is-add{background:var(--add-bg)}.diff-row.is-add .sign{color:var(--add-mark)}
.diff-row.is-del{background:var(--del-bg)}.diff-row.is-del .sign{color:var(--del-mark)}
.diff-row.is-del .src{color:#7a5249}
.diff-row.is-focus{box-shadow:inset 3px 0 0 var(--pen)}
.pins{position:sticky;right:0;display:flex;align-items:center;gap:4px;padding:0 12px 0 6px;background:inherit}
.pins:empty{padding:0}
.pin{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--pen);color:#fff;font:600 11px/1 var(--sans);flex:none;animation:pin .45s var(--ease) both}
.pin.review{background:#b07a06}.pin.compatible{background:var(--green-ink)}
@keyframes pin{from{opacity:0;transform:scale(.4)}to{opacity:1;transform:none}}
.tk-key{color:var(--tk-key);font-weight:500}.tk-str{color:var(--tk-str)}.tk-num{color:var(--tk-num)}.tk-p{color:var(--tk-p)}
.sheet-status{display:flex;align-items:center;gap:12px;padding:14px 14px 14px 16px;border-bottom:1px solid var(--line)}
.status-dot{width:10px;height:10px;border-radius:50%;background:var(--faint);flex:none;box-shadow:0 0 0 3px var(--paper-2)}
.sheet[data-state=busy] .status-dot{background:#c9900f;animation:breathe .8s ease-in-out infinite alternate}
.sheet[data-state=breaking] .status-dot,.sheet[data-state=error] .status-dot{background:var(--pen);box-shadow:0 0 0 3px var(--pen-wash)}
.sheet[data-state=review] .status-dot{background:#c9900f;box-shadow:0 0 0 3px var(--amber-wash)}
.sheet[data-state=clean] .status-dot{background:var(--add-mark);box-shadow:0 0 0 3px var(--green-wash)}
.status-copy{display:flex;flex-direction:column;min-width:0;flex:1;line-height:1.35}
.status-copy strong{font-size:15px;font-weight:600;color:var(--ink)}
.status-copy span{font-size:13px;color:var(--muted)}
.findings{list-style:none;margin:0;padding:0}
.finding{display:grid;grid-template-columns:20px minmax(0,1fr);align-items:start;gap:6px 12px;padding:14px 16px;border-bottom:1px solid var(--line);transition:background-color .15s}
.finding:last-child{border-bottom:0}
.finding:not(.is-placeholder):not(.is-clean):hover{background:var(--surface-2)}
.finding .pin{animation-delay:.05s}
.finding .tag{grid-column:2;justify-self:start}
.finding-copy{grid-column:2;display:flex;flex-direction:column;gap:2px;min-width:0}
.finding-path{font:500 13px/1.5 var(--mono);color:var(--ink);overflow-wrap:anywhere}
.finding-message{font-size:14px;color:var(--muted)}
.finding.is-placeholder{display:block}
.finding.is-placeholder .skeleton-line{margin:6px 0}
.finding.is-clean{grid-template-columns:20px minmax(0,1fr);font-size:14px;color:var(--ink-2);padding-block:16px}
.clean-mark{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--add-mark);color:#fff;font-size:11px;font-weight:700}
.sheet-foot{display:flex;align-items:center;justify-content:space-between;gap:8px 16px;flex-wrap:wrap;padding:12px 16px;border-top:1px solid var(--line);background:var(--surface-2);font-size:13px;color:var(--muted)}
.sheet-link{display:inline-flex;align-items:center;gap:6px;color:var(--ink);font-weight:560}
.sheet-link:hover{text-decoration:underline;text-underline-offset:4px}
.sheet-noscript{padding:12px 16px;font-size:13px;color:var(--muted);border-top:1px solid var(--line)}

/* Sections */
.section{padding-block:clamp(64px,9vw,120px);border-top:1px solid var(--line)}
.section-intro{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:24px clamp(40px,5vw,72px);align-items:end;margin-bottom:clamp(36px,5vw,56px)}
.section-intro h2{margin-top:14px}
.section-lead{font-size:17px;line-height:1.65;color:var(--ink-2);max-width:32em}
.scale{margin:0;border-top:1px solid var(--ink)}
.scale-row{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,5fr) minmax(0,4fr);gap:24px clamp(24px,4vw,56px);align-items:start;padding:28px 0;border-bottom:1px solid var(--line)}
.scale-row dt{padding-top:2px}
.scale-row dd{margin:0}
.scale-def{font-size:16px;line-height:1.6;color:var(--muted)}
.scale-def strong{display:block;color:var(--ink);font-weight:600;font-size:17px;margin-bottom:4px;letter-spacing:-.01em}
.scale-example{display:flex;flex-direction:column;gap:4px;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);font-size:14px;color:var(--muted)}
.example-label{font-size:12px;font-weight:560;color:var(--faint)}
.scale-example code{font-size:13px;color:var(--ink);font-weight:500;overflow-wrap:anywhere}
.split{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(40px,6vw,88px);align-items:center}
.split-copy h2{margin:14px 0 18px}
.split-copy .text-link{margin-top:28px}
.panel{min-width:0;background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line);background:var(--surface-2);font-size:13px}
.panel-title{font-weight:600;color:var(--ink)}
.panel-note{color:var(--muted)}
.panel-code{margin:0;padding:18px 20px;font:13px/24px var(--mono);color:var(--ink-2);overflow-x:auto;background:var(--surface)}
.panel-code .squiggle{text-underline-offset:.3em}
.panel-result{border-top:1px solid var(--line);background:var(--surface-2)}
.panel-summary{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.panel-summary strong{color:var(--ink);font-weight:600;font-size:15px}
.panel-meta{margin-left:auto;font-size:13px;color:var(--muted)}
.panel-finding{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:center;padding:14px 16px}
.panel-finding>div{display:flex;flex-wrap:wrap;gap:2px 12px;align-items:baseline}
.status-mark{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;flex:none;font:700 12px/1 var(--sans);color:#fff;background:var(--add-mark)}
.status-mark.fail{background:var(--pen)}
.status-mark.warn{background:#b07a06}

/* Spec band */
.spec{background:var(--ink);color:#c9c7c1;padding-block:clamp(64px,9vw,120px)}
.spec h2{color:#fff}
.spec .kicker{color:#a3a29d}
.spec .section-lead{color:#c9c7c1}
.spec-grid{margin:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0 clamp(24px,3vw,40px)}
.spec-grid>div{padding:20px 0 28px;border-top:1px solid #34363b}
.spec-grid dt{font-size:13px;font-weight:560;color:#8f8e89;margin-bottom:8px}
.spec-grid dd{margin:0;font-size:16px;line-height:1.55;color:#ecebe6}

/* Closing */
.closing{display:flex;align-items:flex-end;justify-content:space-between;gap:32px 48px;flex-wrap:wrap;padding-block:clamp(72px,9vw,128px)}
.closing p{margin-top:16px;font-size:17px;color:var(--muted)}
.closing-actions{display:flex;flex-wrap:wrap;gap:12px}

/* Footer */
.site-footer{border-top:1px solid var(--line);background:var(--paper);padding:56px 0 28px;font-size:14px}
.footer-top{display:grid;grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));gap:32px;margin-bottom:48px}
.footer-brand{font-size:16px}
.footer-description{margin-top:14px;max-width:290px;color:var(--muted);line-height:1.55}
.footer-links{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer-label{font-size:13px;font-weight:600;color:var(--ink);margin-bottom:4px}
.footer-links a{color:var(--muted);transition:color .15s}
.footer-links a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:4px}
.footer-company{margin:0 0 20px;font-size:13px;line-height:1.7;color:var(--muted)}
.footer-company a{color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.footer-bottom{display:flex;justify-content:space-between;gap:8px 24px;flex-wrap:wrap;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}

/* Content pages */
.page-hero{padding:clamp(48px,7vw,88px) 0 clamp(32px,4vw,48px);max-width:820px}
.page-hero h1{font-size:clamp(2.25rem,1.6rem + 2.4vw,3.5rem);letter-spacing:-.04em;line-height:1.04;margin:18px 0 18px}
.page-hero .body-copy,.page-hero .lead{font-size:clamp(1.0625rem,1rem + .3vw,1.1875rem);color:var(--ink-2);line-height:1.6;max-width:36em}
.page-meta{margin-top:20px;font-size:14px;color:var(--muted)}
.body-copy{color:var(--ink-2)}
.article-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:clamp(40px,6vw,88px);padding:48px 0 clamp(72px,9vw,120px);border-top:1px solid var(--line)}
.article,.article-nav{min-width:0}
.article{max-width:42rem}
.article-nav{position:sticky;top:calc(var(--header) + 32px);align-self:start;display:flex;flex-direction:column;font-size:14px;border-left:1px solid var(--line)}
.article-nav .footer-label{padding:0 0 8px 16px;margin:0}
.article-nav a{padding:6px 0 6px 16px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);line-height:1.4;transition:color .15s,border-color .15s}
.article-nav a:hover{color:var(--ink)}
.article-nav a[aria-current=true]{color:var(--ink);border-left-color:var(--pen);font-weight:540}
.article section{margin-bottom:56px;scroll-margin-top:calc(var(--header) + 24px)}
.article section:last-child{margin-bottom:0}
.article h2{font-size:clamp(1.5rem,1.3rem + .6vw,1.75rem);letter-spacing:-.025em;line-height:1.2;margin:0 0 16px}
.article p,.article li{font-size:16.5px;line-height:1.75;color:var(--ink-2)}
.article p+p{margin-top:14px}
.article ul,.article ol{padding-left:1.3em;margin:12px 0 0}
.article li{padding-left:4px}
.article li+li{margin-top:8px}
.article li::marker{color:var(--faint)}
.article ol li::marker{font:500 14px var(--mono);color:var(--muted)}
.article strong{color:var(--ink);font-weight:600}
.article a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--pen);text-underline-offset:4px;text-decoration-thickness:1px}
.article a:hover{text-decoration-thickness:2px}
.article code{font-size:.86em;background:var(--surface);border:1px solid var(--line);color:var(--ink);padding:1px 6px;border-radius:5px;overflow-wrap:anywhere}
.code-figure{margin:24px 0;background:var(--surface);border:1px solid var(--line-2);border-radius:10px;overflow:hidden}
.code-figure figcaption{padding:9px 16px;border-bottom:1px solid var(--line);background:var(--surface-2);font:500 12.5px/1.4 var(--mono);color:var(--muted)}
.article pre{margin:0;max-width:100%;padding:16px 20px;overflow:auto;font:13.5px/1.75 var(--mono);color:var(--ink-2);background:var(--surface)}
.article pre code{padding:0;border:0;background:none;font-size:inherit;overflow-wrap:normal}
.note{margin:24px 0 0;padding:18px 20px;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--ink);border-radius:var(--radius-sm);font-size:15.5px;line-height:1.7;color:var(--ink-2)}
.note strong{display:block;color:var(--ink);margin-bottom:4px}
.detail-list{margin:24px 0;display:grid;grid-template-columns:150px minmax(0,1fr);border-top:1px solid var(--line)}
.detail-list dt,.detail-list dd{margin:0;padding:14px 0;border-bottom:1px solid var(--line);font-size:15.5px}
.detail-list dt{display:flex;align-items:center}
.detail-list dd{color:var(--ink-2)}
.not-found{padding-block:clamp(72px,12vw,160px)}
.not-found h1{margin:20px 0 16px}
.not-found .button{margin-top:32px}

/* Playground */
.playground-main{padding-bottom:clamp(56px,8vw,96px)}
.pg-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px 32px;flex-wrap:wrap;padding-top:clamp(32px,4vw,48px);padding-bottom:24px}
.pg-head h1{font-size:clamp(2rem,1.6rem + 1.4vw,2.75rem);letter-spacing:-.04em;line-height:1.05;margin:14px 0 10px}
.pg-lead{font-size:16px;color:var(--muted);max-width:40em}
.tool-card{background:var(--surface);border:1px solid var(--line-2);border-radius:var(--radius);box-shadow:var(--shadow);overflow:clip}
.tool-bar{display:flex;align-items:center;justify-content:space-between;gap:8px 12px;flex-wrap:wrap;padding:8px 10px;border-bottom:1px solid var(--line);background:var(--surface-2)}
.tool-tabs{display:inline-flex;padding:3px;gap:2px;background:var(--paper-2);border:1px solid var(--line);border-radius:9px}
.tab{height:32px;padding:0 14px;border:0;border-radius:6px;background:transparent;color:var(--muted);font-size:14px;font-weight:540;transition:background-color .15s,color .15s}
.tab:hover{color:var(--ink)}
.tab[aria-selected=true]{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px rgba(20,21,24,.1),0 0 0 1px rgba(20,21,24,.04)}
.tab:disabled{cursor:progress}
.tool-bar-actions{display:flex;gap:4px}
.editor-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.editor-panel{min-width:0;display:flex;flex-direction:column}
.editor-panel+.editor-panel{border-left:1px solid var(--line)}
.editor-label{display:flex;align-items:center;gap:10px;min-height:48px;padding:8px 10px 8px 16px;border-bottom:1px solid var(--line)}
.editor-label label{font-size:14px;font-weight:600;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.editor-role{flex:none;height:20px;display:inline-flex;align-items:center;padding:0 7px;border-radius:5px;background:var(--paper-2);color:var(--muted);font-size:12px;font-weight:560}
.tool[data-mode=compare] #right-role{background:var(--pen-wash);color:var(--pen-ink)}
.editor-size{margin-left:auto;font:12px var(--mono);color:var(--faint);white-space:nowrap}
.editor-size.is-over{color:var(--pen-ink)}
.upload-button{flex:none;height:28px;padding:0 10px;border:1px solid var(--line-2);border-radius:6px;background:var(--surface);font-size:13px;font-weight:540;color:var(--ink-2);transition:background-color .15s,border-color .15s}
.upload-button:hover{background:var(--paper-2);border-color:#c2bdb0}
.upload-button:disabled,.button.ghost:disabled{opacity:.45}
.editor-wrap{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr);flex:1;background:var(--surface)}
.gutter{position:relative;overflow:hidden;width:52px;background:var(--surface-2);border-right:1px solid var(--line)}
.gutter-inner{position:absolute;top:0;left:0;right:0;padding:16px 10px 16px 0;text-align:right;font:12px/22px var(--mono);color:var(--faint);white-space:pre;user-select:none;will-change:transform}
.editor{display:block;width:100%;min-height:440px;height:440px;margin:0;padding:16px 16px 16px 14px;border:0;border-radius:0;resize:vertical;background:transparent;color:var(--ink);font:13px/22px var(--mono);tab-size:2;white-space:pre;overflow:auto;scrollbar-width:thin}
.editor::placeholder{color:var(--faint)}
.editor:focus{outline:none}
.editor:focus-visible{outline:2px solid var(--focus);outline-offset:-2px;border-radius:0}
.editor[readonly]{color:var(--muted)}
.editor-help{padding:8px 16px;border-top:1px solid var(--line);background:var(--surface-2);font-size:13px;color:var(--muted)}
.tool-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:12px 16px;border-top:1px solid var(--line);background:var(--surface)}
.tool-actions #run-check{min-width:164px}
.tool-actions #download-report{margin-left:auto}
.shortcut{display:inline-flex;gap:4px;color:var(--faint)}
kbd{display:inline-grid;place-items:center;min-width:22px;height:22px;padding:0 6px;border:1px solid var(--line-2);border-bottom-width:2px;border-radius:5px;background:var(--surface-2);font-size:11.5px;color:var(--muted)}
.local-note{font-size:13px;color:var(--muted)}
.results-panel{min-height:180px;padding:20px 16px 8px;border-top:1px solid var(--line);background:var(--surface-2)}
.results-summary{display:flex;align-items:center;justify-content:space-between;gap:10px 16px;flex-wrap:wrap;padding-bottom:16px}
.results-head{display:flex;align-items:center;gap:10px;min-width:0}
.results-title{font-size:18px;font-weight:600;letter-spacing:-.015em;color:var(--ink)}
.results-meta{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.count{display:inline-flex;align-items:center;height:24px;padding:0 9px;border-radius:999px;border:1px solid var(--line-2);background:var(--surface);font-size:12.5px;font-weight:560;color:var(--ink-2)}
.count.breaking{background:var(--pen-wash);border-color:var(--pen-line);color:var(--pen-ink)}
.count.review{background:var(--amber-wash);border-color:var(--amber-line);color:var(--amber-ink)}
.count.compatible{background:var(--green-wash);border-color:var(--green-line);color:var(--green-ink)}
.count.is-zero{background:transparent;border-color:var(--line);color:var(--faint)}
.findings-list{border-top:1px solid var(--line)}
.change-row{display:grid;grid-template-columns:28px 104px minmax(0,1fr);gap:12px;align-items:baseline;padding:14px 0;border-bottom:1px solid var(--line)}
.change-row:last-child{border-bottom:0}
.change-index{font:500 12px var(--mono);color:var(--faint);text-align:right}
.change-row .tag{justify-self:start}
.change-path{font:500 13.5px/1.5 var(--mono);color:var(--ink);overflow-wrap:anywhere}
.change-message{font-size:14.5px;line-height:1.55;color:var(--muted);margin-top:2px}
.results-note{padding:14px 0 12px;font-size:14px;color:var(--muted);border-top:1px solid var(--line)}
.empty-result{display:flex;align-items:center;gap:14px;padding:16px 0 24px;color:var(--muted)}
.empty-icon{display:grid;place-items:center;width:44px;height:44px;flex:none;border-radius:10px;background:var(--surface);border:1px dashed var(--line-2);font:500 13px var(--mono);color:var(--faint)}
.empty-result strong{display:block;color:var(--ink);font-size:15px;font-weight:600}
.empty-result p{font-size:14px;margin-top:2px}
.loading-state{padding:4px 0 24px;color:var(--ink);font-size:15px}
.loading-state strong{font-weight:600;display:flex;align-items:center;gap:10px}
.loading-state strong:before{content:'';width:14px;height:14px;border-radius:50%;border:2px solid var(--line-2);border-top-color:var(--ink);animation:spin .7s linear infinite}
.skeleton-line{display:block;height:10px;width:min(420px,90%);margin-top:16px;border-radius:4px;background:var(--paper-2);animation:breathe .9s ease-in-out infinite alternate}
.skeleton-line.short{width:55%;margin-top:10px}
.results-error{margin-bottom:12px;padding:14px 16px;border:1px solid var(--pen-line);border-left:3px solid var(--pen);border-radius:var(--radius-sm);background:var(--pen-wash);color:var(--pen-ink);font-size:14.5px;line-height:1.55;overflow-wrap:anywhere}
.results-error strong{display:block;color:var(--ink);font-weight:600;margin-bottom:2px}
.tool-disclosure{margin-top:16px;max-width:52rem;font-size:13.5px;line-height:1.6;color:var(--muted)}
.tool-disclosure a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:3px}
.tool-disclosure a:hover{text-decoration-color:var(--ink)}
.toast{position:fixed;left:50%;bottom:24px;z-index:40;transform:translate(-50%,12px);padding:10px 16px;border-radius:var(--radius-sm);background:var(--ink);color:#f4f3ee;font-size:14px;box-shadow:0 10px 30px -10px rgba(20,21,24,.4);opacity:0;pointer-events:none;transition:opacity .2s,transform .25s var(--ease)}
.toast.show{opacity:1;transform:translate(-50%,0)}
.fatal-message{margin-top:16px;padding:14px 16px;border-radius:var(--radius-sm);background:var(--pen-wash);color:var(--pen-ink)}

/* Motion */
.reveal{animation:appear .7s var(--ease) both}
.sheet.reveal{animation-delay:.08s}
@keyframes appear{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
@keyframes breathe{from{opacity:.4}to{opacity:1}}
@keyframes spin{to{transform:rotate(360deg)}}

/* Responsive */
@media(max-width:1080px){
  .spec-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .scale-row{grid-template-columns:minmax(0,1fr) minmax(0,2fr)}
  .scale-example{grid-column:2}
  .footer-top{grid-template-columns:minmax(0,1.3fr) repeat(3,minmax(0,1fr))}
}
@media(max-width:960px){
  .hero-intro{grid-template-columns:minmax(0,1fr);align-items:start}
  .sheet-body{grid-template-columns:minmax(0,1fr)}
  .sheet-aside{border-left:0;border-top:1px solid var(--line)}
  .diff{min-height:0}
  .split{grid-template-columns:minmax(0,1fr)}
  .split .panel{order:2}
  .section-intro{grid-template-columns:minmax(0,1fr);align-items:start}
  .article-layout{grid-template-columns:minmax(0,1fr);gap:32px;padding-top:24px}
  .article-nav{position:static;flex-direction:row;flex-wrap:wrap;gap:4px 8px;border-left:0;padding-bottom:20px;border-bottom:1px solid var(--line)}
  .article-nav .footer-label{width:100%;padding:0 0 4px}
  .article-nav a{margin:0;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font-size:13.5px}
  .article-nav a[aria-current=true]{border-color:var(--ink)}
}
@media(max-width:820px){
  .editor-grid{grid-template-columns:minmax(0,1fr)}
  .editor-panel+.editor-panel{border-left:0;border-top:1px solid var(--line)}
  .editor{min-height:260px;height:300px}
  .footer-top{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px 24px}
  .footer-intro{grid-column:1/-1}
}
@media(max-width:720px){
  :root{--header:58px}
  .menu-toggle{display:inline-flex}
  .nav{display:none;position:absolute;top:var(--header);left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;padding:10px var(--gutter) 18px;background:var(--paper);border-bottom:1px solid var(--line);box-shadow:0 16px 24px -20px rgba(20,21,24,.3)}
  .nav.open{display:flex}
  .nav>a:not(.button){padding:12px 4px;font-size:16px;border-radius:0;border-bottom:1px solid var(--line)}
  .nav>a:not(.button):hover{background:none}
  .nav .nav-cta{margin:12px 0 0;height:44px;font-size:15px}
  .hero-actions .button{flex:1 1 200px}
  .scale-row{grid-template-columns:minmax(0,1fr);gap:12px;padding:24px 0}
  .scale-example{grid-column:auto}
  .spec-grid{grid-template-columns:minmax(0,1fr)}
  .closing-actions{width:100%}
  .closing-actions .button{flex:1 1 220px}
  .tool-bar{padding:8px}
  .tool-tabs{flex:1 1 100%}
  .tab{flex:1;padding:0 8px}
  .tool-bar-actions{width:100%;justify-content:flex-end}
  .shortcut{display:none}
  .tool-actions{position:sticky;bottom:0;z-index:5;padding:10px 12px;box-shadow:0 -10px 20px -18px rgba(20,21,24,.35)}
  .tool-actions #run-check{flex:1 1 auto}
  .local-note{display:none}
  .results-panel{padding:16px 12px 6px}
  .change-row{grid-template-columns:22px minmax(0,1fr);gap:4px 10px}
  .change-row .tag{grid-column:2}
  .change-row>div{grid-column:2}
  .toast{bottom:80px;max-width:calc(100% - 32px);white-space:nowrap}
  .detail-list{grid-template-columns:120px minmax(0,1fr)}
  .footer-bottom{flex-direction:column}
}
@media(max-width:560px){
  .sheet-head{padding:10px 12px}
  .segmented{width:100%}
  .segmented button{flex:1}
  .diff{font-size:12px;line-height:22px}
  .diff-row .ln{width:24px;font-size:10.5px}
  .diff-row .sign{width:20px}
  .finding{padding:12px}
  .sheet-status{padding:12px;flex-wrap:wrap}
  .status-copy{flex:1 1 150px}
  .sheet-foot{padding:12px}
  .article p,.article li{font-size:16px}
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .detail-list{grid-template-columns:minmax(0,1fr)}
  .editor-role{display:none}
  .gutter{width:44px}
  .detail-list dt{border-bottom:0;padding-bottom:0}
}
@media(max-width:380px){
  .brand{font-size:16px}
  .editor-size{display:none}
  .hero-facts{flex-direction:column}
  .editor-role{display:none}
  .sheet-versions{display:none}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}