/* K-028 · design/spec.md v1.0 + mockup.html (confirmed). Component numbers ①–⑮ follow the spec. */

/* ---------- 1. tokens ---------- */
:root{
  --paper:#faf9f6;--surface:#fff;--white:#fff;--ink:#242a31;--muted:#5b6368;--line:#ccd2d1;--line-soft:#e4e8e6;
  --green:#1e5d50;--green-deep:#123b32;--green-soft:#e3efe8;--pale:#edf4ef;--accent:#dce8e2;--code-bg:#f1f3ef;--thead:#f4f6f3;
  --focus:#237d63;--amber-bg:#fff4dc;--amber-ink:#7a4b00;--mark:#fff2c6;--shadow:0 2px 8px rgba(36,42,49,.12);
  --tier-core-bg:#1e5d50;--tier-core-ink:#fff;--tier-main-bg:#e3efe8;--tier-main-ink:#1e5d50;--tier-main-line:#c9ddd2;
  --tier-ref-bg:#eef0ee;--tier-ref-ink:#4f5a56;--tier-ref-line:#d9dedb;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.75 -apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;word-break:keep-all}
a{color:var(--green);text-underline-offset:3px}
a:hover{color:var(--green-deep)}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;margin:-1px;padding:0;border:0}
.skip{position:absolute;left:16px;top:-100px;background:var(--surface);padding:12px;z-index:10}
.skip:focus{top:8px}
code{font-family:var(--mono);font-size:.92em;background:var(--code-bg);padding:0 4px;border-radius:3px}
kbd{font-family:inherit;font-size:.9em;border:1px solid var(--line);border-radius:4px;background:var(--surface);padding:1px 6px;white-space:nowrap}

/* ---------- ① header ---------- */
.topbar{position:sticky;top:0;z-index:5;background:var(--paper);border-bottom:1px solid var(--line)}
.topbar-inner{max-width:1280px;margin:auto;padding:0 32px;height:56px;display:flex;align-items:center;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;min-height:44px;margin:0 -8px;padding:6px 8px;border-radius:6px;background:transparent;font-size:16px;font-weight:700;color:var(--ink);text-decoration:none;letter-spacing:-.2px;white-space:nowrap}
.brand:hover{color:var(--ink)}.brand:hover .brand-label{color:var(--green)}
/* for CNLab pen note (Kalam Regular, 60px-tall PNG whose bottom edge is the text baseline):
   pivots on its left baseline so it starts on the brand-text baseline and rises gently */
.brand-note{display:block;width:auto;height:22px;margin-left:-14px;transform:translateY(-4.5px) rotate(-3deg);transform-origin:0 100%;flex:none;user-select:none;pointer-events:none}
.topnav{margin-left:auto;display:flex;gap:20px}
.topnav a{font-size:14px;color:var(--muted);text-decoration:none;white-space:nowrap}
.topnav a:hover,.topnav a[aria-current=page]{color:var(--ink)}
.topnav a[aria-current=page]{font-weight:600}
.topmeta{display:flex;align-items:center;gap:10px}
.author{font-size:13px;font-weight:600;white-space:nowrap}
.course-version{font-size:12px;line-height:1.5;padding:1px 8px;border:1px solid var(--line);border-radius:999px;font-variant-numeric:tabular-nums;color:var(--muted);background:var(--surface);white-space:nowrap}
a.course-version{text-decoration:none}a.course-version:hover{color:var(--green);border-color:var(--green)}
/* portal build only (BASE_PATH != '/'): quiet link back to the domain front page */
.portal-home{display:inline-flex;align-items:center;min-height:44px;padding:0 4px;font-size:13px;color:var(--muted);text-decoration:none;white-space:nowrap}
.portal-home:hover{color:var(--green)}

/* ---------- layout ---------- */
.layout{max-width:1280px;margin:auto;padding:24px 32px 64px;display:grid;grid-template-columns:216px minmax(0,1fr);gap:40px}
main{max-width:900px;min-width:0}

/* ---------- ② sidebar ---------- */
.sidebar{position:sticky;top:72px;align-self:start;max-height:calc(100vh - 88px);display:flex;flex-direction:column;font-size:13px}
.sidebar-head{display:grid;grid-template-columns:32px 1fr;column-gap:8px;align-items:center;padding:0 0 12px;border-bottom:1px solid var(--line-soft);background:var(--paper)}
.icon-btn{width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--green);text-decoration:none;padding:0;flex:none}
.icon-btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.icon-btn:hover{background:var(--pale);border-color:var(--green);color:var(--green)}
.icon-slot{width:32px;height:32px}
.sidebar-back-label{color:var(--muted);line-height:32px}
.sidebar-head.has-back{display:block}
.sidebar-back{display:flex;align-items:center;gap:8px;width:100%;min-height:44px;margin:-6px 0;padding:6px 0;border:0;border-radius:6px;background:transparent;text-decoration:none;cursor:pointer}
.sidebar-back:hover .icon-btn{background:var(--pale);border-color:var(--green)}
.sidebar-back:hover .sidebar-back-label{color:var(--ink)}
.sidebar-back:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.sidebar-home-label{font-weight:600;letter-spacing:.06em}
.sidebar-scroll{position:relative;overflow-y:auto;min-height:0;padding:8px 0 24px;scrollbar-width:thin;-webkit-mask-image:linear-gradient(#000 calc(100% - 32px),transparent);mask-image:linear-gradient(#000 calc(100% - 32px),transparent)}
.sidebar-scroll.at-end{-webkit-mask-image:none;mask-image:none}
.sidebar-scroll a{display:block;padding:8px 12px 8px 14px;color:var(--ink);text-decoration:none;line-height:1.45;border-left:3px solid transparent;border-radius:0 6px 6px 0}
.sidebar-scroll a:hover{background:var(--pale);color:var(--ink)}
.sidebar-scroll a[aria-current]{border-left-color:var(--green);background:var(--green-soft);font-weight:600}
.stage-tree,.stage-items{list-style:none;margin:0;padding:0}
.stage-row{display:flex;align-items:center;gap:2px}
.sidebar-scroll .stage-link{flex:1 1 auto;min-width:0;padding:7px 8px 7px 14px;font-size:14px;font-weight:500;color:var(--ink);border-left:0;border-radius:6px}
.sidebar-scroll .stage-link:hover{background:var(--pale)}
.stage.is-current .stage-link{font-size:15px;font-weight:700;color:var(--green)}
.sidebar-scroll .stage.is-current .stage-link[aria-current]{background:transparent;border-left:0}
.sidebar-scroll .stage.is-current .stage-link:hover{background:var(--pale)}
.stage-toggle{flex:none;width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center;padding:0;border:0;border-radius:6px;background:transparent;color:var(--muted)}
.stage-toggle:hover{background:var(--pale);color:var(--green)}
.stage-toggle .chev{width:8px;height:8px;border-right:1.6px solid currentColor;border-bottom:1.6px solid currentColor;transform:translateX(-1px) rotate(-45deg);transition:transform .15s}
.stage-toggle[aria-expanded=true] .chev{transform:translateY(-2px) rotate(45deg)}
.stage-items{margin:0 0 8px 14px;padding-left:0;border-left:1px solid var(--line-soft)}
.sidebar-scroll .stage-items a{padding:7px 10px 7px 12px;margin-left:-1px}
.stage + .stage{margin-top:2px}
.sidebar-mobile{display:none}

/* ---------- headings ---------- */
.breadcrumbs{font-size:13px;color:var(--muted);margin:0 0 12px;line-height:32px;overflow-wrap:anywhere}
.breadcrumbs a{text-decoration:none}
.breadcrumbs a:hover{text-decoration:underline}
.breadcrumbs span{color:var(--ink)}
h1{font-size:clamp(28px,3vw,36px);line-height:1.25;letter-spacing:-.5px;margin:0 0 16px;font-weight:700}
h2{font-size:24px;line-height:1.35;letter-spacing:-.3px;margin:48px 0 12px;font-weight:700}
h3{font-size:20px;line-height:1.4;margin:32px 0 8px;font-weight:700}
h4{font-size:15px;line-height:1.5;margin:20px 0 4px;font-weight:600}
.intro{font-size:18px;line-height:1.6;margin:0 0 20px;max-width:640px}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--green);margin:0 0 8px}

/* ---------- ③ level tabs ---------- */
.level-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:20px 0 24px}
.level-tabs a{font-size:14px;color:var(--muted);text-decoration:none;padding:10px 14px;border-bottom:2px solid transparent;margin-bottom:-1px;border-radius:6px 6px 0 0;line-height:1.3;white-space:nowrap}
.level-tabs a:hover{color:var(--ink);background:var(--pale)}
.level-tabs a[aria-current=page]{color:var(--green);font-weight:700;border-bottom-color:var(--green)}

/* ---------- ④ toolbar ---------- */
.toolbar{display:flex;gap:12px;align-items:center;margin:0 0 8px}
.search-field{flex:1;min-width:0;height:40px;display:flex;align-items:center;gap:8px;padding:0 4px 0 12px;border:1px solid var(--line);border-radius:6px;background:var(--surface)}
.search-field:focus-within{border-color:var(--green);outline:2px solid var(--focus);outline-offset:2px}
.search-field>svg{width:16px;height:16px;fill:none;stroke:var(--muted);stroke-width:1.6;stroke-linecap:round;flex:none}
.search-field input{border:0;background:transparent;font-size:15px;width:100%;min-width:0;outline:none;padding:0;height:100%}
.search-field input::-webkit-search-cancel-button{display:none}
.search-field .clear{width:32px;height:32px;border:0;background:transparent;color:var(--muted);font-size:20px;line-height:1}
.search-field .clear:hover{background:var(--pale);color:var(--ink)}
.search-submit{flex:none;width:72px;height:40px;padding:0 12px;border:1px solid var(--green);border-radius:6px;background:var(--green);color:var(--white);font-size:15px;font-weight:600;white-space:nowrap}
.search-submit:hover{background:var(--green-deep);border-color:var(--green-deep)}
.status{font-size:13px;line-height:1.55;color:var(--muted);margin:0 0 16px}

/* ---------- ⑤ keyword table ---------- */
.category-table,.purpose{margin:40px 0}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:8px 16px;flex-wrap:wrap;margin:0 0 12px}
.section-head h2,.section-head h3{font-size:20px;line-height:1.4;letter-spacing:-.3px;margin:0}
.section-head span{font-size:13px;color:var(--muted);white-space:nowrap}
.section-note{font-size:14px;line-height:1.65;color:var(--muted);margin:0 0 12px;max-width:760px}
.keyword-table{width:100%;border-collapse:collapse;table-layout:fixed;background:transparent}
.keyword-table col.c-tier,.controls-table col.c-tier{width:56px}
.keyword-table.has-ask col.c-name{width:18%}.keyword-table.has-ask col.c-mean{width:28%}
.keyword-table.no-ask col.c-name{width:30%}
.keyword-table th{font-size:13px;font-weight:600;line-height:1.55;color:var(--muted);text-align:left;padding:8px 16px;border-bottom:1px solid var(--line);vertical-align:bottom}
.keyword-table th.c-tier,.controls-table th.c-tier{text-align:center;padding:8px}
.keyword-table td{padding:12px 16px;vertical-align:top;border-bottom:1px solid var(--line-soft);font-size:14px;line-height:1.7;overflow-wrap:anywhere}
.keyword-table td.c-tier,.controls-table td.c-tier{text-align:center;padding:14px 8px}
.keyword-table tbody tr:hover td,.controls-table tbody tr:hover td{background:var(--pale)}
.keyword-table td code{background:var(--code-bg)}
.tier{display:inline-block;min-width:40px;height:20px;line-height:18px;padding:0 6px;border-radius:4px;font-size:12px;font-weight:600;text-align:center;border:1px solid transparent;vertical-align:middle;white-space:nowrap}
.tier-core{background:var(--tier-core-bg);color:var(--tier-core-ink)}
.tier-main{background:var(--tier-main-bg);color:var(--tier-main-ink);border-color:var(--tier-main-line)}
.tier-ref{background:var(--tier-ref-bg);color:var(--tier-ref-ink);border-color:var(--tier-ref-line)}
.keyword-name{display:block;font-size:15px;font-weight:600;color:var(--green);text-decoration:none;line-height:1.5;overflow-wrap:anywhere}
.keyword-name:hover{text-decoration:underline}
.keyword-name code{font-size:14px;background:none;padding:0;color:inherit}
.keyword-name kbd{font-size:13px;font-weight:600}
.keyword-en{display:block;font-size:12px;color:var(--muted);margin-top:2px;line-height:1.5;font-weight:400;overflow-wrap:anywhere}
.detail-link{display:inline-block;font-size:12px;line-height:1.5;margin-top:6px;text-decoration:none;white-space:nowrap}
.detail-link:hover{text-decoration:underline}
.c-mean{color:var(--ink)}
.ask-result{font-size:13px;line-height:1.55;color:var(--muted);margin:6px 0 0;text-wrap:pretty}
.keyword-table tbody tr[id],.controls-table tbody tr[id]{scroll-margin-top:30vh}
.keyword-table tbody tr:focus,.controls-table tbody tr:focus{outline:none}
.keyword-table tbody tr:target>td,.keyword-table tbody tr.is-target>td,.controls-table tbody tr:target>td,.controls-table tbody tr.is-target>td{background:var(--mark)}
.keyword-table tbody tr:target>td:first-child,.keyword-table tbody tr.is-target>td:first-child,.controls-table tbody tr:target>td:first-child,.controls-table tbody tr.is-target>td:first-child{box-shadow:inset 3px 0 var(--green)}
.keyword-name[aria-current=location]{text-decoration:underline}
.tier-toggle{margin-top:8px}

/* OS command comparison (basic 6-A, shortcuts 6-G) */
.table-scroll{overflow-x:auto;margin:12px 0;-webkit-overflow-scrolling:touch}
.table-scroll:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.os-command-table col.c-name{width:30%}
.os-command-table td.c-os{font-size:13px;line-height:1.6}
.os-command-table td.c-os code{font-size:13px;background:none;padding:0;color:var(--ink)}
.command-purpose{font-size:13px;line-height:1.55;color:var(--muted);margin:4px 0 0;font-weight:400}
.cmd-alt{display:block;font-size:12px;line-height:1.5;color:var(--muted);margin-top:2px}
.os-command-table .cmd-alt code{font-size:12px;color:var(--muted)}
.cmd-note{font-size:12px;color:var(--muted)}
.scroll-hint{display:none}
.command-notes{margin:16px 0 0;font-size:14px;line-height:1.65}
.command-notes h3{font-size:15px;margin:0 0 4px}
.command-notes p{margin:0 0 8px}
details.command-notes{border-top:1px solid var(--line-soft);padding-top:8px}
details.command-notes summary{cursor:pointer;font-weight:600;font-size:14px;color:var(--green);padding:4px 0}
details.command-notes ul{margin:8px 0 0;padding-left:20px}
details.command-notes li{margin:4px 0}

/* ---------- ⑧ request bubble ---------- */
/* C5 종합형(11-10 확정): 요청 줄에만 초록 띠, 16px 보통 굵기, 결과는 띠 없이 작은 회색 글씨 */
.ask{display:grid;grid-template-columns:minmax(0,1fr) 28px;grid-template-areas:"t btn" "r r";column-gap:8px;row-gap:8px;align-items:start;padding:0;margin:0}
.ask>.copy-btn{grid-area:btn;margin-top:-1px}
.ask-text{grid-area:t;font-size:16px;line-height:1.6;margin:0;padding:1px 0 1px 13px;border-left:3px solid var(--green);color:var(--ink);font-weight:400;overflow-wrap:anywhere;text-wrap:pretty}
.ask .ask-result{grid-area:r;margin:0;padding:0 16px}
.ask+.ask{margin-top:8px}

/* ---------- ⑥ purpose cards ---------- */
.purpose-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.purpose-card{background:var(--surface);border:1px solid var(--line-soft);border-radius:8px;padding:20px;display:flex;flex-direction:column;gap:10px;margin:0;min-width:0;scroll-margin-top:96px}
.purpose-card h3{font-size:16px;line-height:1.45;font-weight:700;margin:0}
.purpose-card .ask+.ask{margin-top:0}
.when,.result{font-size:13px;color:var(--muted);margin:0;line-height:1.55}
.check-block{margin:4px 0 0}
.check-title{font-size:12px;font-weight:600;color:var(--muted);margin:0 0 2px}
.check{list-style:none;margin:0;padding:0;font-size:13px;line-height:1.6}
.check li{padding-left:18px;text-indent:-18px}
.check li::before{content:"\2713";color:var(--green);margin-right:6px;display:inline-block;width:12px;text-indent:0}
.purpose-keys{font-size:13px;line-height:1.6;margin:0;color:var(--muted);border-top:1px solid var(--line-soft);padding-top:10px}
.purpose-keys span{font-weight:600;margin-right:4px}
.purpose-keys a{text-decoration:none}
.purpose-keys a:hover{text-decoration:underline}

/* ---------- ⑦ direct controls ---------- */
.controls-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:14px}
.controls-table col.c-key{width:24%}.controls-table col.c-what{width:44%}
.controls-table th{font-size:13px;font-weight:600;line-height:1.55;color:var(--muted);text-align:left;padding:8px 12px;border-bottom:1px solid var(--line)}
.controls-table td{padding:10px 12px;border-bottom:1px solid var(--line-soft);vertical-align:top;line-height:1.6;overflow-wrap:anywhere}
.controls-table code{font-size:13px;font-weight:600;background:none;padding:0;color:var(--ink)}
.controls-table td.c-key .detail-link{display:block;margin-top:4px}
.ctl-name{font-weight:600}
.ctl-when{font-size:13px;line-height:1.55;color:var(--muted);margin:4px 0 0}
.controls-table td.c-os{font-size:13px}
.same{font-size:12px;color:var(--muted)}
.os{display:inline-block;width:32px;font-size:11px;font-weight:600;letter-spacing:.04em;color:var(--muted)}

/* ---------- ⑩ code block ---------- */
pre{position:relative;background:var(--code-bg);border:1px solid var(--line-soft);border-radius:8px;padding:12px 44px 12px 16px;margin:12px 0;overflow-x:auto;line-height:1.6;white-space:pre;word-break:normal}
pre code{font-size:13.5px;background:none;padding:0;border-radius:0;color:var(--ink);display:block}
.os-label{display:block;font-size:12px;font-weight:600;line-height:1.5;color:var(--muted);margin:16px 0 -6px}
.os-label+pre,.os-label+.copy-block{margin-top:12px}

/* ---------- ⑪ OS tabs ---------- */
.os-switch{margin:20px 0 16px}
.os-switch .tablist{display:inline-flex;gap:2px;padding:2px;border:1px solid var(--line);border-radius:6px;background:var(--surface);margin:0 0 16px}
.os-switch [role=tab]{min-width:120px;height:34px;padding:0 16px;border:0;border-radius:4px;background:transparent;font-size:14px;color:var(--muted)}
.os-switch [role=tab]:hover{color:var(--ink);background:var(--pale)}
.os-switch [role=tab][aria-selected=true]{background:var(--green-soft);color:var(--green);font-weight:700}
.os-panel{margin:0 0 8px}
.os-panel:focus-visible{outline:2px solid var(--focus);outline-offset:4px}
.os-panel+.os-panel{margin-top:24px}
.js-os .os-panel+.os-panel{margin-top:0}
.os-band{font-size:14px!important;font-weight:700;line-height:1.5;padding:6px 12px;border-left:3px solid var(--green);background:var(--green-soft);border-radius:0 6px 6px 0;margin:0 0 12px!important;letter-spacing:0}
h3.os-both{color:var(--muted);border-left-color:var(--line);background:var(--surface);margin-top:32px!important}

/* ---------- ⑫ detail pages ---------- */
.detail-wrap{max-width:760px;margin:auto;padding:32px 24px 64px}
.detail-wrap .breadcrumbs{margin-bottom:16px}
.detail-title{font-size:clamp(24px,3vw,28px);line-height:1.3;margin:0 0 8px;overflow-wrap:anywhere}
.detail-title code{font-size:.85em;background:none;padding:0}
.detail-title+.keyword-en{font-size:15px;margin:0 0 20px}
.detail-content>.intro,.detail-content .intro{font-size:17px;line-height:1.7;margin:0 0 24px;max-width:none}
.detail-content h2{font-size:24px;margin:48px 0 12px}
.detail-content h3{font-size:20px;margin:32px 0 8px}
.detail-content li{margin:8px 0}
.detail-content h4+p{margin-top:0}
.detail-content a{overflow-wrap:anywhere}
.detail-content p code,.detail-content td code,.detail-content li code{overflow-wrap:anywhere}
.detail-toc{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 24px}
.detail-toc a{font-size:13px;line-height:1.5;padding:4px 10px;border:1px solid var(--line);border-radius:999px;text-decoration:none;background:var(--surface)}
.detail-toc a:hover{border-color:var(--green);background:var(--pale)}
.comparison-table,.definition,.metadata{border-collapse:collapse;width:100%;font-size:14px;line-height:1.65;background:transparent}
.comparison-table th,.comparison-table td,.definition th,.definition td{padding:10px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line-soft)}
.comparison-table thead th{font-size:13px;font-weight:600;color:var(--muted);border-bottom:1px solid var(--line);background:none}
.comparison-table th[scope=row],.definition th{font-weight:600;color:var(--ink);min-width:100px}
.definition th{width:150px}
.comparison-table td code{font-size:.92em}
.comparison-table th.c-tier,.comparison-table td.c-tier{width:56px;text-align:center;padding-left:8px;padding-right:8px;white-space:nowrap}
.source-line{font-size:13px;line-height:1.55;color:var(--muted);margin:8px 0 0}
.detail-nav{display:flex;gap:12px;justify-content:space-between;flex-wrap:wrap;margin-top:40px}
.source-content{overflow-wrap:anywhere}

/* ---------- ⑬ intro story ---------- */
.summary{border-left:3px solid var(--green);padding:2px 0 2px 16px;margin:0 0 24px}
.summary strong{display:block;margin-bottom:2px}
.summary p{margin:0;color:var(--muted)}
.story{margin:8px 0 48px}
.story-head{text-align:center;max-width:640px;margin:0 auto 8px;padding:24px 0 8px}
.story-kicker{font-size:12px;letter-spacing:.06em;color:var(--green);font-weight:700;margin:0 0 6px}
.detail-content .story-head h2{font-size:28px;margin:0 0 12px;letter-spacing:-.5px}
.story-lead{font-size:17px;line-height:1.7;margin:0 0 16px}
.story-hint{display:inline-flex;align-items:center;gap:8px;margin:0;padding:3px 12px;border:1px solid var(--accent);border-radius:999px;background:var(--pale);color:var(--green);font-size:13px;font-weight:600}
.story-scenes{list-style:none;margin:0;padding:0}
.detail-content .story-scene{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px;align-items:center;margin:0;padding:40px 0}
.story-scene:nth-child(even) .story-art{order:2}
.detail-content .story-scene:nth-child(even){grid-template-columns:minmax(0,1fr) minmax(0,1.1fr)}
.story-art{margin:0;overflow:hidden;background:#f6f5f1;border:1px solid var(--line-soft);border-radius:12px}
.story-art img{display:block;width:100%;height:auto;aspect-ratio:4/3}
.story-num{font-size:12px;font-weight:700;letter-spacing:.06em;color:var(--green);margin:0 0 6px}
.detail-content .story-text h3{font-size:20px;line-height:1.45;margin:0 0 10px}
.story-text p{margin:0 0 10px}
.story-text p:last-child{margin-bottom:0}
.story-text .story-levels{display:flex;flex-wrap:wrap;align-items:center;gap:6px 8px;margin-top:16px;font-size:13px}
.story-levels a{padding:3px 10px;border:1px solid var(--green);border-radius:999px;background:var(--surface);text-decoration:none;font-weight:600;white-space:nowrap}
.story-levels a:hover{background:var(--pale)}
.story-levels span{color:var(--muted)}
.story-end{max-width:640px;margin:16px auto 0;padding:24px;text-align:center;background:var(--surface);border:1px solid var(--line-soft);border-radius:8px}
.story-end p{margin:0 0 16px}
.story-end .story-end-title{font-size:20px;font-weight:700;margin-bottom:6px}
.intro-terms .toolbar{margin-top:16px}
.intro-terms .category-table{margin:32px 0}

/* ---------- ⑭ buttons · notices ---------- */
.btn,.button{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 16px;font-size:14px;font-weight:600;line-height:1.2;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--green);text-decoration:none;white-space:nowrap}
.btn:hover,.button:hover{border-color:var(--green);background:var(--pale);color:var(--green)}
.btn.primary,.button.primary{background:var(--green);color:#fff;border-color:var(--green)}
.btn.primary:hover,.button.primary:hover{background:var(--green-deep);border-color:var(--green-deep);color:#fff}
.btn.sm{height:32px;padding:0 12px;font-size:13px}
.notice{font-size:14px;line-height:1.65;color:var(--ink);padding:10px 14px;border-left:3px solid var(--green);background:var(--green-soft);border-radius:0 6px 6px 0;margin:16px 0}
.notice.warn{border-left-color:var(--amber-ink);background:var(--amber-bg);color:var(--amber-ink)}
.notice.plain{font-size:13px;color:var(--muted);padding:0;border:0;background:none}
.notice.plain:empty{display:none}

/* ---------- ⑮ footer ---------- */
.footer{border-top:1px solid var(--line-soft);margin-top:64px;padding:20px 0 0;display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.footer nav{display:flex;gap:16px;flex-wrap:wrap}
.footer a{font-size:13px;color:var(--muted);text-decoration:none}
.footer a:hover{color:var(--ink)}
.footer-meta{font-size:12px;color:var(--muted);margin:0;font-variant-numeric:tabular-nums}

/* ---------- version history (sources.html) ---------- */
.metadata{max-width:540px;margin:12px 0 20px;font-size:13px}
.metadata th,.metadata td{padding:6px 12px;text-align:left;border-bottom:1px solid var(--line-soft);white-space:nowrap}
.metadata th{font-weight:600;color:var(--muted);border-bottom-color:var(--line)}
.metadata td.version-note{white-space:normal}
.version-current{display:inline-block;margin-left:6px;padding:0 6px;border-radius:999px;font-size:11px;line-height:18px;background:var(--green-soft);color:var(--green);font-weight:600}

/* ---------- home (K-029 · design/home-v2/home-simple.html, approved) ---------- */
.home{max-width:760px;margin:0 auto;padding:0 32px 48px;font-size:17px;line-height:1.8;-webkit-font-smoothing:antialiased}
.home .hero{padding:88px 0 72px}
.home .hero .hero-label{margin:0 0 14px;font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--green)}
.home .hero h1{margin:0 0 20px;font-size:clamp(30px,3.4vw,40px);line-height:1.25;letter-spacing:-.5px;text-wrap:balance}
.home .hero .lead{max-width:34em;margin:0 0 14px;font-size:18px;line-height:1.75;color:var(--muted);text-wrap:pretty}
.home .hero .lead:last-of-type{margin-bottom:32px}
.home .btn.start{height:52px;padding:0 28px;font-size:17px}
.home .toc{margin-bottom:56px}
.home .toc h2{margin:0 0 14px;font-size:26px;line-height:1.35;letter-spacing:-.3px}
.home .toc ol{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.home .toc li{border-bottom:1px solid var(--line-soft)}
.home .row{display:grid;grid-template-columns:32px minmax(0,1fr) 20px;align-items:start;column-gap:16px;padding:20px 0;text-decoration:none;color:inherit}
.home .num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;margin-top:-2px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font-size:12px;font-weight:600;color:var(--muted);line-height:1;font-variant-numeric:tabular-nums}
.home .text{display:block;min-width:0}
.home .name{display:block;font-size:20px;font-weight:700;line-height:28px}
.home .name small{display:inline-block;margin-left:8px;font-size:13px;font-weight:600;color:var(--green);white-space:nowrap;vertical-align:1px}
.home .desc{display:block;margin-top:4px;max-width:40em;font-size:16px;line-height:1.6;color:var(--muted);text-wrap:pretty}
.home .arrow{font-size:17px;line-height:28px;color:var(--muted);text-align:right}
.home .row:hover .name,.home .row:hover .arrow{color:var(--green)}
.home .row.first .num{background:var(--green);border-color:var(--green);color:#fff}
.home .row.first .name{color:var(--green)}
.home-search{scroll-margin-top:72px}
.home-search>label{display:block;font-size:17px;font-weight:700;margin:0 0 10px}
.home-search .toolbar{margin:0}
.search-status{font-size:13px;color:var(--muted);margin:8px 0 0}
#global-search-status{min-height:20px}
#global-results h2{font-size:20px;margin:32px 0 0}
#global-result-groups>section{margin:20px 0}
#global-result-groups h3{font-size:17px;margin:0 0 8px}
.home .footer{margin-top:64px}

/* ---------- review ---------- */
textarea{display:block;width:100%;min-height:280px;padding:12px;margin:12px 0;border:1px solid var(--line);border-radius:6px;background:var(--surface)}
.review-actions{display:flex;gap:8px;flex-wrap:wrap}

/* ---------- ccstatusline terminal mock-ups (unchanged; no copy buttons) ---------- */
.cc-terminal-example{width:100%;min-width:0;margin:24px 0}
.cc-terminal-window{max-width:100%;overflow:hidden;border:1px solid #505050;border-radius:10px;background:#1e1e1e;color:#dedede;font:13px/1.8 var(--mono);word-break:normal;overflow-wrap:normal;color-scheme:dark}
.cc-terminal-titlebar{display:grid;grid-template-columns:68px minmax(0,1fr) 68px;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid #464646;background:#303030}
.cc-terminal-buttons{display:flex;gap:7px}
.cc-terminal-buttons span{width:11px;height:11px;border-radius:50%;background:#ff5f57}
.cc-terminal-buttons span:nth-child(2){background:#febc2e}
.cc-terminal-buttons span:nth-child(3){background:#28c840}
.cc-terminal-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:center;color:#bdbdbd;font-size:12px}
.cc-terminal-scroll{max-width:100%;overflow-x:auto}
.cc-terminal-scroll:focus-visible{outline:2px solid #56d4dd;outline-offset:-3px}
.cc-terminal-screen{width:max-content;min-width:100%;padding:18px 20px}
.cc-terminal-line{white-space:pre}
.cc-terminal-input{margin-top:18px;padding:10px 14px;border:1px solid #737373;border-radius:12px;white-space:pre}
.cc-terminal-status{margin-top:8px}
.cc-terminal-native{margin-top:8px;color:#999;white-space:pre}
.cc-ansi-cyan{color:#56d4dd}.cc-ansi-magenta{color:#db94df}.cc-ansi-yellow{color:#e5c07b}.cc-ansi-green{color:#98c379}.cc-ansi-blue{color:#82aaff}.cc-ansi-gray{color:#999}
.cc-terminal-legend{display:grid;gap:4px;margin-top:10px;color:var(--muted);font-size:13px}

/* ---------- tablet ---------- */
@media(max-width:1000px){
  .home{padding:0 24px 48px}
  .layout{grid-template-columns:184px minmax(0,1fr);gap:28px;padding:24px 24px 56px}
  .topbar-inner{padding:0 24px;gap:16px}
  .purpose-grid{grid-template-columns:1fr}
  .level-tabs{overflow-x:auto;scrollbar-width:none}
  .level-tabs a{padding:10px 10px}
  .detail-content .story-scene,.detail-content .story-scene:nth-child(even){grid-template-columns:minmax(0,1fr);gap:16px;padding:32px 0}
  .story-scene:nth-child(even) .story-art{order:0}
  .story-art{max-width:520px}
}

/* ---------- phone ---------- */
@media(max-width:700px){
  html{scroll-padding-top:100px}
  .topbar-inner{flex-wrap:wrap;height:auto;padding:10px 16px;row-gap:6px;gap:12px}
  .brand{font-size:15px;flex:0 1 auto;white-space:normal}
  .brand-note{height:16px;margin-left:-6px;margin-right:auto;transform:translateY(-2px) rotate(-3deg)}
  .topnav{margin-left:0;order:3;flex:1 1 auto;gap:16px}
  .topnav a{font-size:13px}
  .topmeta{order:4;margin-left:auto}
  .author{order:4;font-size:12px}
  .portal-home{padding:0;font-size:12px}
  .layout{display:block;padding:16px 16px 48px}
  .sidebar{display:none}
  .sidebar-mobile{display:block;margin:0 0 16px;background:var(--surface);border:1px solid var(--line);border-radius:8px}
  .sidebar-mobile summary{list-style:none;display:flex;align-items:center;gap:10px;min-height:44px;padding:6px 12px;font-size:14px;font-weight:600;cursor:pointer}
  .sidebar-mobile summary::-webkit-details-marker{display:none}
  .sidebar-mobile .chev{margin-left:auto;width:8px;height:8px;border-right:1.6px solid var(--muted);border-bottom:1.6px solid var(--muted);transform:rotate(45deg);transition:transform .15s}
  .sidebar-mobile[open] .chev{transform:rotate(-135deg)}
  .chip-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:0 12px 12px}
  .chip-grid a{display:flex;align-items:center;min-height:44px;padding:10px 12px;font-size:13px;line-height:1.4;color:var(--ink);text-decoration:none;border:1px solid var(--line-soft);border-radius:6px;border-left:3px solid var(--line-soft)}
  .chip-grid a[aria-current]{background:var(--green-soft);border-left-color:var(--green);font-weight:600}
  .mobile-head{display:flex;align-items:center;gap:8px;margin-bottom:8px}
  .breadcrumbs{margin:0}
  h1{font-size:28px}
  h2,.detail-content h2{font-size:22px}
  .intro{font-size:16px}
  .level-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;border:0;overflow:visible}
  .level-tabs a{min-height:40px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:6px;font-size:13px;padding:6px 4px;margin:0;text-align:center;white-space:normal;line-height:1.3}
  .level-tabs a[aria-current=page]{background:var(--green);color:#fff;border-color:var(--green)}
  /* keyword table → cards (OS comparison tables excluded) */
  .keyword-table:not(.os-command-table) thead{position:absolute;clip:rect(0 0 0 0);width:1px;height:1px;overflow:hidden}
  .keyword-table:not(.os-command-table),.keyword-table:not(.os-command-table) tbody{display:block}
  .keyword-table:not(.os-command-table) tr{display:grid;grid-template-columns:56px minmax(0,1fr);grid-template-areas:"tier name" "mean mean" "ask ask";padding:14px 0;border-bottom:1px solid var(--line-soft)}
  .keyword-table:not(.os-command-table) tr[hidden]{display:none}
  .keyword-table:not(.os-command-table) td{display:block;border:0;padding:0;width:auto}
  .keyword-table:not(.os-command-table) td.c-tier{grid-area:tier;padding:2px 0 0;text-align:left}
  .keyword-table:not(.os-command-table) td.c-name{grid-area:name}
  .keyword-table:not(.os-command-table) td.c-mean{grid-area:mean;margin-top:8px}
  .keyword-table:not(.os-command-table) td.c-ask{grid-area:ask;margin-top:10px}
  .keyword-table:not(.os-command-table) td.c-ask:empty{display:none}
  .keyword-table:not(.os-command-table) tbody tr:hover td{background:transparent}
  .keyword-table:not(.os-command-table) tbody tr.is-target,.keyword-table:not(.os-command-table) tbody tr:target{background:var(--mark);box-shadow:inset 3px 0 var(--green);padding-left:8px}
  .keyword-table:not(.os-command-table) tbody tr.is-target>td,.keyword-table:not(.os-command-table) tbody tr:target>td{background:transparent;box-shadow:none}
  .ask .ask-result{padding-right:0}
  /* OS comparison: horizontal scroll, first text column fixed, right fade hint */
  .scroll-hint{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;line-height:1.5;color:var(--green);margin:0 0 6px}
  .scroll-hint::after{content:"→";font-weight:400}
  /* right-edge shadow for the whole table height; the local cover slides over it once scrolled to the end */
  .os-scroll{background:linear-gradient(90deg,rgba(250,249,246,0),var(--paper) 60%) 100% 0/36px 100% no-repeat local,linear-gradient(270deg,rgba(36,42,49,.18),rgba(36,42,49,0)) 100% 0/16px 100% no-repeat scroll}
  .os-command-table{min-width:760px}
  .os-command-table col.c-name{width:150px}
  .os-command-table td.c-name,.os-command-table th.c-name{position:sticky;left:0;background:var(--paper);z-index:1;box-shadow:1px 0 0 var(--line-soft)}
  .os-command-table tbody tr:hover td.c-name{background:var(--pale)}
  .keyword-table td,.keyword-table th{padding:10px 12px}
  .purpose-card{padding:16px}
  .purpose-grid{gap:12px}
  /* controls table → 3-line blocks */
  .controls-table thead{position:absolute;clip:rect(0 0 0 0);width:1px;height:1px;overflow:hidden}
  .controls-table,.controls-table tbody{display:block}
  .controls-table tr{display:grid;grid-template-columns:56px minmax(0,1fr);grid-template-areas:"tier key" "what what" "os os";padding:10px 0;border-bottom:1px solid var(--line-soft)}
  .controls-table tr[hidden]{display:none}
  .controls-table td{display:block;border:0;padding:0;width:auto}
  .controls-table td.c-tier{grid-area:tier;padding:2px 0 0;text-align:left}
  .controls-table td.c-key{grid-area:key}
  .controls-table td.c-what{grid-area:what;margin-top:4px}
  .controls-table td.c-os{grid-area:os;font-size:12px;color:var(--muted);margin-top:2px}
  .controls-table td.c-os br{display:none}
  .controls-table td.c-os .same::before{content:"Mac·Windows "}
  .controls-table td.c-os .os{width:auto;margin:0 4px 0 8px}
  .controls-table td.c-os .os:first-child{margin-left:0}
  .controls-table tbody tr:hover td{background:transparent}
  .controls-table tbody tr.is-target,.controls-table tbody tr:target{background:var(--mark)}
  .controls-table tbody tr.is-target>td,.controls-table tbody tr:target>td{background:transparent;box-shadow:none}
  pre{padding:10px 40px 10px 12px}
  pre code{font-size:13px}
  .os-switch .tablist{display:flex;width:100%}
  .os-switch [role=tab]{flex:1;min-width:0;height:44px}
  .detail-wrap{padding:24px 16px 48px}
  .detail-title{font-size:24px}
  /* comparison tables → stacked rows: tier badge on top, then each cell under its column header (data-label is set at build time) */
  .comparison-table thead{position:absolute;clip:rect(0 0 0 0);width:1px;height:1px;overflow:hidden}
  .comparison-table,.comparison-table tbody,.comparison-table tr{display:block}
  .comparison-table tr{display:flex;flex-direction:column;align-items:stretch;padding:14px 0;border-bottom:1px solid var(--line-soft)}
  .comparison-table th,.comparison-table td{display:block;border:0;padding:0;min-width:0;width:auto}
  .comparison-table td.c-tier{width:auto;text-align:left;padding:0;margin:0 0 8px}
  .comparison-table [data-label]+[data-label]{margin-top:10px}
  .comparison-table [data-label]::before{content:attr(data-label);display:block;font-size:12px;font-weight:600;line-height:1.5;color:var(--muted);margin-bottom:2px}
  .comparison-table [data-label]:empty{display:none}
  .comparison-table .copy-inline{padding-right:8px}  /* room for the copy button's 44px hit area at the cell edge */
  .comparison-table th[scope=rowgroup]{order:-1;margin:0 0 10px;font-size:15px}
  .comparison-table th[scope=rowgroup]::before{display:none}
  .comparison-table caption{display:block;text-align:left}
  .definition th{width:100px}
  .detail-nav .btn{flex:1;height:44px}
  .footer{flex-direction:column;gap:8px}
  .home{padding:0 16px 40px}
  .home .hero{padding:56px 0 48px}
  .home .btn.start{width:100%}
  .home .hero .lead{font-size:17px;line-height:1.7}
  .home .row{grid-template-columns:28px minmax(0,1fr) 16px;column-gap:12px;padding:16px 0}
  .home .num{width:28px;height:28px;margin-top:-1px;border-radius:7px;font-size:11px}
  .home .name{font-size:18px;line-height:26px}
  .home .desc{font-size:15px;margin-top:2px}
  .home .arrow{font-size:16px;line-height:26px}
  .story-art{border-radius:10px}
  .detail-content .story-text h3{font-size:18px}
  .detail-content .story-head h2{font-size:24px}
  .story-end{padding:20px 16px}
  .cc-terminal-window{font-size:12px}
  .cc-terminal-screen{padding:14px}
  .cc-terminal-titlebar{grid-template-columns:54px minmax(0,1fr) 54px;padding:9px 12px}
}
/* portal build, narrow phones: row 2 (menu + version + author) is already full at 360px,
   so the portal link moves to the right end of row 1 (after "for CNLab") */
@media(max-width:480px){
  .topmeta:has(.portal-home){display:contents}
  .portal-home{order:2;margin-left:-4px}
  .topmeta:has(.portal-home) .course-version{order:4;margin-left:auto}
  .topmeta:has(.portal-home) .author{order:5}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media print{
  .topbar,.sidebar,.sidebar-mobile,.toolbar,.status,.level-tabs,.detail-nav,.skip,.tier-toggle,.scroll-hint,.os-switch .tablist{display:none!important}
  .layout{display:block;padding:0}
  body{background:#fff}
  main{max-width:none}
  .os-switch .os-panel[hidden]{display:block!important}
  .category-table{break-inside:auto}
  .keyword-table tr,.controls-table tr,.purpose-card,.detail-content .story-scene{break-inside:avoid}
  .os-scroll{-webkit-mask-image:none;mask-image:none;overflow:visible}
  .footer{margin-top:20px}
  a{color:inherit}
}