/* site.css: phone-first worksheet (redesign 2026-10-31). Colours are var(--rikyu-*) only (tokens.css).
   Why the sizes: a standing reader at arm's length in a loud hall, so 17px body, 26px questions, 56px tiles.
   Why kuro for "selected": sabi on shiro is 1.78:1 and does not read as a state at a glance; kuro is 15.99:1. */
@font-face{font-family:"Rikyu Plex Thai";src:url(fonts/IBMPlexSansThai-Regular.ttf) format("truetype");font-weight:400;font-display:swap}
@font-face{font-family:"Rikyu Plex Thai";src:url(fonts/IBMPlexSansThai-SemiBold.ttf) format("truetype");font-weight:600;font-display:swap}
@font-face{font-family:"Rikyu Plex Thai";src:url(fonts/IBMPlexSansThai-Bold.ttf) format("truetype");font-weight:700;font-display:swap}
:root{--rikyu-font-sans:"Rikyu Plex Thai","IBM Plex Sans Thai","Noto Sans Thai",system-ui,sans-serif;
 --r:14px;--gut:20px;--col:560px;--bar:88px;--ease:cubic-bezier(.22,1,.36,1);
 --z-bar:20;--z-top:30;--z-menu:40}
/* No cross-document @view-transition: in Chromium 2026-10-31 it stayed active after load and blocked taps (test_web.py). */
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--rikyu-paper);-webkit-text-size-adjust:100%}
body{font-family:var(--rikyu-font-sans);color:var(--rikyu-ink);background:var(--rikyu-paper);font-size:17px;line-height:1.6;min-height:100vh}
.nw{white-space:nowrap}
b,strong{font-weight:600}
a{color:var(--rikyu-ink);text-underline-offset:4px;text-decoration-thickness:1px}
:focus-visible{outline:2px solid var(--rikyu-ink);outline-offset:3px;border-radius:4px}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.ic{width:22px;height:22px;flex:none}
.ic--flip{transform:scaleX(-1)}

/* top bar */
.top{position:sticky;top:0;z-index:var(--z-top);background:var(--rikyu-paper);padding:0 var(--gut)}
.top__in{max-width:var(--col);margin:0 auto;display:flex;align-items:center;justify-content:space-between;min-height:52px}
.home{font-weight:700;font-size:15px;text-decoration:none;letter-spacing:.02em;min-height:44px;display:flex;align-items:center}
.menu summary{list-style:none;cursor:pointer;font-size:15px;font-weight:600;min-height:44px;display:flex;align-items:center;padding:0 2px}
.menu summary::-webkit-details-marker{display:none}
.menu[open] summary{text-decoration:underline;text-underline-offset:6px}
.menu ul{position:fixed;z-index:var(--z-menu);top:52px;right:var(--gut);width:min(300px,calc(100vw - 2 * var(--gut)));list-style:none;
 background:var(--rikyu-paper);border-radius:var(--r);padding:8px;box-shadow:0 12px 40px color-mix(in srgb,var(--rikyu-ink) 16%,transparent),0 0 0 1px color-mix(in srgb,var(--rikyu-ink) 6%,transparent)}
.menu a{display:flex;align-items:center;min-height:44px;padding:0 12px;border-radius:10px;text-decoration:none;font-size:16px}
.menu a[aria-current]{background:var(--rikyu-stone);font-weight:600}
.prog{max-width:var(--col);margin:0 auto;padding:2px 0 12px}
.segs{display:grid;grid-template-columns:repeat(5,1fr);gap:4px}
.pseg{height:4px;border-radius:2px;background:var(--rikyu-stone)}
.pseg--done,.pseg--now{background:var(--rikyu-ink)}
.part{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:10px}
.part__chip{display:inline-flex;align-items:center;font-size:14px;font-weight:600;background:var(--rikyu-stone);border-radius:999px;padding:3px 12px}
.part__n{font-size:14px;font-variant-numeric:tabular-nums}

/* layout */
.main{max-width:calc(var(--col) + 2 * var(--gut));margin:0 auto;padding:20px var(--gut) 48px}
.step .main{padding-bottom:calc(var(--bar) + 32px + env(safe-area-inset-bottom))}
.panel{padding-top:8px}
html.paged .panel{animation:rise .22s var(--ease)}
html.paged .panel+.panel{margin-top:0}
.panel+.panel{margin-top:56px}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* question */
.q{margin:8px 0 20px}
.q__kick{font-size:14px;font-weight:600;margin-bottom:4px}
.q__t{display:block;font-size:26px;line-height:1.35;font-weight:600;text-wrap:balance;letter-spacing:-.005em}
.q__t:focus{outline:none}
.q--tight{margin-bottom:14px}
h3.q__t{font-size:22px}
.q__help{font-size:16px;margin-top:8px;max-width:40ch}
.panel>.q~.q,.panel>textarea+.q,.panel>.tiles+.q{margin-top:36px}
.panel>.q~.q .q__t{font-size:22px}

/* tiles */
.tiles{display:flex;flex-direction:column;gap:8px}
.tile{position:relative;display:flex;align-items:center;gap:14px;min-height:56px;padding:12px 16px;border-radius:var(--r);
 background:var(--rikyu-stone);cursor:pointer;line-height:1.4;transition:background-color .15s,color .15s;-webkit-tap-highlight-color:transparent}
.tile input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.tile__m{flex:none;width:22px;height:22px;border-radius:50%;box-shadow:inset 0 0 0 1.5px var(--rikyu-ink);display:grid;place-items:center}
.tile:has(input:checked){background:var(--rikyu-ink);color:var(--rikyu-paper)}
.tile:has(input:checked) .tile__m{box-shadow:inset 0 0 0 7px var(--rikyu-paper)}
.tile:has(input:focus-visible){outline:2px solid var(--rikyu-ink);outline-offset:3px}
.tile:active{transform:scale(.99)}
.tiles--dense{gap:6px}
.tiles--dense .tile{min-height:50px;padding:9px 16px}
.tiles.chips{display:flex;flex-wrap:wrap;gap:8px;flex-direction:row}
.chips .tile{min-height:48px;padding:8px 16px;border-radius:999px}
.chips .tile__m{display:none}
.grp{font-size:15px;font-weight:600;margin:20px 0 8px}
.tiles.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;flex-direction:row}
.tiles.seg .tile{justify-content:center;min-height:48px;padding:8px 6px;border-radius:12px;font-size:16px}
.tiles.seg .tile__m{display:none}

/* text */
textarea,input[type=text]{width:100%;font:inherit;font-size:17px;color:var(--rikyu-ink);background:var(--rikyu-stone);border:0;border-radius:var(--r);padding:14px 16px;line-height:1.5}
textarea{resize:vertical;min-height:96px}
textarea:focus,input[type=text]:focus{outline:2px solid var(--rikyu-ink);outline-offset:0}
::placeholder{color:var(--rikyu-ink);opacity:.6}

/* small things */
.ex{font-size:14px;line-height:1.55;margin-top:20px}
.ex__tag{display:inline-block;font-size:12px;font-weight:600;border-radius:999px;box-shadow:inset 0 0 0 1px var(--rikyu-ink);padding:0 8px;margin-right:4px}
.aside{font-size:15px;line-height:1.55;margin-top:24px;padding-top:14px;border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent);max-width:44ch}
.aside--risk{margin-top:32px}
.picked{background:color-mix(in srgb,var(--rikyu-ink) 6%,transparent);border-radius:8px;padding:14px 16px;margin:0 0 24px}.picked__h{font-size:14px;margin:0 0 4px;opacity:.75}.picked__v{font-size:19px;font-weight:600;margin:0;line-height:1.45}.picked__info{margin-top:10px}.qcfirst{margin:6px 0 0;font-size:17px;line-height:1.55}.qchyp{font-weight:500;white-space:pre-line}.li__r{margin:4px 0 0;font-size:16px;line-height:1.5;display:grid;grid-template-columns:4.2em 1fr;gap:0 6px}.li__r>span:first-child{font-weight:600}.linfo{list-style:none;padding:0;margin:8px 0 0}.linfo li{padding:10px 0;border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent)}.li__t{margin:0;font-weight:600}.picked__back{margin-top:8px;font:inherit;font-size:14px;background:none;border:0;padding:0;text-decoration:underline;cursor:pointer;color:inherit}
.small{font-size:15px;line-height:1.55;margin:12px 0}
.msg{font-size:15px;margin-top:12px;min-height:1.5em}
.tag{display:inline-block;font-size:13px;font-weight:600;line-height:1.5;background:var(--rikyu-sabi);color:var(--rikyu-ink);border-radius:6px;padding:0 7px}
.tag--line{background:none;box-shadow:inset 0 0 0 1px var(--rikyu-ink)}

/* fold */
.fold{margin-top:16px}
.fold>summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:48px;font-size:16px;font-weight:600}
.fold>summary::-webkit-details-marker{display:none}
.fold>summary::after{content:"";flex:none;width:9px;height:9px;border-right:1.5px solid var(--rikyu-ink);border-bottom:1.5px solid var(--rikyu-ink);transform:rotate(45deg) translateY(-3px);transition:transform .2s var(--ease)}
.fold[open]>summary::after{transform:rotate(-135deg) translateY(-2px)}
.fold>summary small{font-weight:400;font-size:14px;margin-left:auto}
.fold>summary span{flex:1}
.fold .q{margin-top:8px}
.panel>.fold{border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent)}
.panel>.fold+.fold{margin-top:0}
.nums{display:flex;flex-direction:column;gap:14px;padding:4px 0 8px}
.num{display:grid;grid-template-columns:1fr auto;gap:6px 10px;align-items:center}
.num>label:first-child{grid-column:1/-1;font-size:15px}
.chk{display:inline-flex;align-items:center;gap:8px;min-height:48px;font-size:15px;padding:0 4px;cursor:pointer}
.chk input,.tick input{width:22px;height:22px;accent-color:var(--rikyu-ink);flex:none}

/* tub */
.tub{display:block;width:100%;max-width:400px;height:auto;margin:4px 0 8px}
.tub--s{max-width:300px;margin:8px 0 16px}

/* ladder */
.lad{position:relative;margin-top:4px}
.lad__end{font-size:14px;font-weight:600;padding:4px 0 8px 52px}
.lad__end--b{padding:8px 0 0 52px}
.lad__r,.lad--ref li{position:relative;display:flex;gap:14px;align-items:flex-start;min-height:48px;padding:4px 12px 4px 0;cursor:pointer;-webkit-tap-highlight-color:transparent}
.lad__r::before,.lad--ref li::before{content:"";position:absolute;left:18px;top:0;bottom:0;width:2px;background:var(--rikyu-ink)}
.lad__r:first-of-type::before,.lad--ref li:first-child::before{top:50%}
.lad__r:last-of-type::before,.lad--ref li:last-child::before{bottom:50%}
.lad__r input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.lad__n{position:relative;flex:none;width:38px;height:38px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:16px;
 background:var(--rikyu-paper);box-shadow:inset 0 0 0 1.5px var(--rikyu-ink);font-variant-numeric:tabular-nums;transition:background-color .15s,color .15s}
.lad__b{display:flex;flex-direction:column;gap:4px;flex:1;min-height:38px;justify-content:center;padding:6px 14px;border-radius:12px;transition:background-color .15s}
.lad__t{font-size:17px;line-height:1.4;font-weight:600}
.lad__ai{font-size:14px;line-height:1.45}
.lad__r:has(input:checked) .lad__n{background:var(--rikyu-ink);color:var(--rikyu-paper)}
.lad__r:has(input:checked) .lad__b{background:var(--rikyu-ink);color:var(--rikyu-paper)}
.lad__r:has(input:checked) .tag--line{box-shadow:inset 0 0 0 1px var(--rikyu-paper);color:var(--rikyu-paper)}
.lad__r:has(input:focus-visible) .lad__b{outline:2px solid var(--rikyu-ink);outline-offset:2px}
.lad__r:not(:has(input:checked)):hover .lad__b{background:var(--rikyu-stone)}
.lad--ref ol{list-style:none}
.lad--ref li{cursor:default}
.picks{list-style:none;display:flex;flex-direction:column;gap:6px;padding:4px 0 8px}
.pick{width:100%;display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;font:inherit;font-size:16px;color:var(--rikyu-ink);
 background:var(--rikyu-stone);border:0;border-radius:12px;padding:10px 14px;min-height:48px;cursor:pointer}
.pick__to{font-size:14px;font-weight:600}

/* 4 questions */
.meter{display:flex;align-items:center;gap:12px;font-size:15px;margin:-4px 0 16px}
.meter__dots{display:flex;gap:6px}
.meter__d{width:12px;height:12px;border-radius:50%;box-shadow:inset 0 0 0 1.5px var(--rikyu-ink)}
.meter__d.on{background:var(--rikyu-ink)}
.gate{padding:16px 0 18px;border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent)}
.gate:first-of-type{border-top:0;padding-top:0}
.gate__q{display:flex;gap:12px;align-items:flex-start;font-size:18px;font-weight:600;line-height:1.4}
.gate__n,.ix__n,.pc__n{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-size:14px;font-weight:700;
 background:var(--rikyu-ink);color:var(--rikyu-paper);font-variant-numeric:tabular-nums}
.gate__h{font-size:15px;margin:4px 0 12px 40px}
.gate .tiles{margin-left:40px}
.gate__fail{font-size:15px;font-weight:600;margin:10px 0 0 40px}

/* sticky action bar */
.bar{position:fixed;left:0;right:0;bottom:0;z-index:var(--z-bar);background:var(--rikyu-paper);padding:12px var(--gut) calc(12px + env(safe-area-inset-bottom));
 box-shadow:0 -1px 0 color-mix(in srgb,var(--rikyu-ink) 8%,transparent)}
.bar__in{max-width:var(--col);margin:0 auto;display:flex;gap:10px}
.bar__back{flex:none;width:56px;height:56px;border-radius:var(--r);display:grid;place-items:center;background:var(--rikyu-stone);color:var(--rikyu-ink)}
.bar__next{flex:1;height:56px;border-radius:var(--r);display:flex;align-items:center;justify-content:center;gap:10px;background:var(--rikyu-ink);color:var(--rikyu-paper);
 text-decoration:none;font-size:18px;font-weight:600;-webkit-tap-highlight-color:transparent}
.bar__next:active,.bar__back:active,.btn:active{transform:scale(.98)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 20px;border-radius:var(--r);border:0;font:inherit;font-size:17px;
 font-weight:600;text-decoration:none;cursor:pointer;background:var(--rikyu-stone);color:var(--rikyu-ink)}
.btn--p{background:var(--rikyu-ink);color:var(--rikyu-paper)}
.btn--q{background:none;text-decoration:underline;text-underline-offset:4px;padding:0 8px}
.btn--big{min-height:60px;font-size:19px;width:100%}
.acts{display:flex;flex-direction:column;gap:10px;margin-top:20px}

/* landing */
.main--land{padding-top:32px}
.ev{display:flex;flex-wrap:wrap;gap:2px 14px;font-size:14px;font-weight:600}
.land__t{font-size:36px;line-height:1.25;font-weight:700;margin:20px 0 14px;letter-spacing:-.01em;text-wrap:balance}
.land__lead{font-size:19px;line-height:1.55;max-width:30ch}
.land__go{display:flex;flex-direction:column;gap:6px;margin:32px 0 8px}
.how{margin-top:12px}
.how>summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;min-height:44px;font-size:16px;font-weight:600;text-decoration:underline;text-underline-offset:4px}
.how>summary::-webkit-details-marker{display:none}
.how ul{list-style:none;padding:16px;border-radius:var(--r);background:var(--rikyu-stone);font-size:16px;display:flex;flex-direction:column;gap:8px}
.ix{list-style:none;margin:40px 0 0;display:flex;flex-direction:column}
.ix a{display:flex;align-items:center;gap:14px;min-height:52px;text-decoration:none;font-size:17px;border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 10%,transparent)}
.ix li:last-child a{border-bottom:1px solid color-mix(in srgb,var(--rikyu-ink) 10%,transparent)}
.ix__n{background:none;color:var(--rikyu-ink);box-shadow:inset 0 0 0 1.5px var(--rikyu-ink)}
.land__more{display:flex;flex-wrap:wrap;gap:4px 20px;margin-top:28px;font-size:15px}
.land__more a{min-height:44px;display:inline-flex;align-items:center}

/* plain pages */
.pg__t{font-size:30px;line-height:1.3;font-weight:700;margin:16px 0 10px;text-wrap:balance}
.pg__lead{font-size:17px;max-width:42ch}
.pg__h{font-size:22px;line-height:1.35;font-weight:600;margin:48px 0 10px}
.refs,.grefs,.crit{list-style:none;display:flex;flex-direction:column;gap:20px;margin-top:16px}
.ref{padding-top:16px;border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent)}
.ref__s{font-size:16px}
.ref__m{font-size:18px;font-weight:600;margin:2px 0 6px}
.ref__x,.ref__ai{font-size:14px;line-height:1.5;margin-top:4px}
.gref{display:flex;gap:12px}
.gref__q{font-weight:600}
.gref .small{margin:2px 0}
.crit li{font-size:16px}
.case{border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent)}
.case p{font-size:15px;padding-bottom:12px}

/* homework checklist */
.hwl{list-style:none;margin-top:24px}
.hw{display:grid;grid-template-columns:44px 1fr;gap:0 8px;border-top:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent);padding:4px 0}
.hw:last-child{border-bottom:1px solid color-mix(in srgb,var(--rikyu-ink) 12%,transparent)}
.hw__done{position:relative;width:44px;height:56px;display:grid;place-items:center;cursor:pointer}
.hw__done input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.hw__box{width:26px;height:26px;border-radius:8px;box-shadow:inset 0 0 0 1.5px var(--rikyu-ink);display:grid;place-items:center}
.hw__box .ic{width:18px;height:18px;opacity:0}
.hw__done:has(input:checked) .hw__box{background:var(--rikyu-ink);color:var(--rikyu-paper)}
.hw__done:has(input:checked) .ic{opacity:1}
.hw__done:has(input:focus-visible) .hw__box{outline:2px solid var(--rikyu-ink);outline-offset:3px}
.hw:has(.hw__done input:checked) .hw__name{text-decoration:line-through;text-decoration-thickness:1px}
.hw details>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;min-height:56px;font-size:17px;font-weight:600;line-height:1.35}
.hw details>summary::-webkit-details-marker{display:none}
.hw details>summary::after{content:"";flex:none;margin-left:auto;width:9px;height:9px;border-right:1.5px solid var(--rikyu-ink);border-bottom:1.5px solid var(--rikyu-ink);transform:rotate(45deg) translateY(-3px);transition:transform .2s var(--ease)}
.hw details[open]>summary::after{transform:rotate(-135deg) translateY(-2px)}
.hw__id{font-size:14px;font-weight:600;min-width:24px}
.hw__body{padding:4px 0 20px;display:flex;flex-direction:column}
.hw__p{font-size:15px;line-height:1.55;margin-bottom:8px}
.fl{display:block;font-size:15px;font-weight:600;margin:14px 0 6px}
.fl--s{font-weight:400;margin:10px 0 4px}
.hw textarea{min-height:56px}
.days{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin:4px 0 12px}
.day{font:inherit;font-size:15px;font-weight:600;min-height:44px;border:0;border-radius:10px;background:var(--rikyu-stone);color:var(--rikyu-ink);cursor:pointer}
.day[aria-pressed=true]{background:var(--rikyu-ink);color:var(--rikyu-paper)}
.dayp__t{font-size:15px;font-weight:600;margin:6px 0}
html.js .dayp__t{display:none}
.cells{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.cell{display:flex;flex-direction:column;gap:4px;font-size:14px}
.cell input{padding:10px 12px}
.grp2{border:0;margin-top:14px}
.grp2 legend{font-size:15px;font-weight:600;margin-bottom:2px}
.tick{display:flex;gap:12px;align-items:flex-start;padding:10px 0;font-size:15px;line-height:1.5;cursor:pointer}
.tick input{margin-top:2px}

/* optional link */
.opt{margin-top:40px;padding:18px;border-radius:var(--r);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--rikyu-ink) 18%,transparent)}
.opt__tag{display:inline-block;font-size:13px;font-weight:600;background:var(--rikyu-stone);border-radius:999px;padding:1px 10px}
.opt__l{font-weight:600;margin-top:10px}
.opt__p{font-size:15px;margin-top:2px}
.opt__n{font-size:15px;margin-top:6px}

/* plan card: the payoff, made to be screenshotted */
.pc{background:var(--rikyu-ink);color:var(--rikyu-paper);border-radius:20px;padding:22px 20px 18px;margin-top:4px}
.pc__ev{display:flex;justify-content:space-between;gap:12px;font-size:13px;font-weight:600}
.pc__t{font-size:26px;line-height:1.3;font-weight:700;margin-top:18px}
.pc__w{font-size:15px;margin-top:2px}
.pc__list{list-style:none;margin-top:16px;display:flex;flex-direction:column}
.pc__i{display:flex;gap:14px;padding:11px 0;border-top:1px solid color-mix(in srgb,var(--rikyu-paper) 22%,transparent)}
.pc__n{background:none;color:var(--rikyu-paper);box-shadow:inset 0 0 0 1.5px var(--rikyu-paper);width:26px;height:26px;font-size:13px}
.pc__l{font-size:13px;font-weight:600;letter-spacing:.01em}
.pc__v{font-size:17px;line-height:1.45;font-weight:600;margin-top:2px;white-space:pre-line;overflow-wrap:anywhere}
.pc__v.is-empty{font-weight:400;font-size:16px}
.pc__i--mon{background:var(--rikyu-sabi);color:var(--rikyu-ink);border-top:0;border-radius:14px;padding:12px 14px;margin-top:6px}
.pc__i--mon .pc__n{color:var(--rikyu-ink);box-shadow:inset 0 0 0 1.5px var(--rikyu-ink)}
.pc__f{font-size:12px;margin-top:14px}

@media (min-width:720px){
 :root{--gut:32px}
 .main{padding-top:40px}
 .q__t{font-size:30px}
 .land__t{font-size:44px}
 .acts{flex-direction:row;flex-wrap:wrap}
 .btn--big{width:auto;padding:0 32px}
 .land__go{flex-direction:row;align-items:center;gap:16px}
}
@media (prefers-reduced-motion:reduce){
 *,*::before,*::after{animation:none!important;transition:none!important}
}
@media print{
 .top,.bar,.acts,.msg,.panel>.q{display:none!important}
 html,body{background:var(--rikyu-paper)}
 .step .main{padding:0}
 .panel{display:none!important}
 .panel:has(.pc){display:block!important}
 .pc{-webkit-print-color-adjust:exact;print-color-adjust:exact;max-width:520px;margin:0 auto}
}