/* AYH v4 (Design Director, Nov 10 2026). Load AFTER /assets/site.css ONLY (no learn-v2/template-v2 / v3 css on v4 pages).
   Uses site.css tokens, so light and dark both work: --bg --bg-2 --tile --ink --ink-2 --line --line-2 --accent --link --f --r --r-lg --pill. */
:root{
  --v4-read:640px;           /* body measure: ~62-70 characters of Inter at 19px (measured 66) */
  --v4-wide:1080px;          /* tiles / hero visual */
  --v4-band:clamp(80px,11vw,160px);   /* section padding top+bottom: 80 (390) .. 160 (1280+) */
  --v4-gap-step:clamp(48px,6vw,72px);
  --v4-bar:#0071E3;
}
@media (prefers-color-scheme:dark){:root{--v4-bar:#2997FF}}

/* ---------- shared */
.v4 {font-family:var(--f)}
.v4 .v4-col{max-width:calc(var(--v4-read) + 2*var(--gutter));margin:0 auto;padding:0 var(--gutter)}
.v4 .v4-col.is-mid{max-width:calc(680px + 2*var(--gutter))}
.v4 .v4-wide{max-width:calc(var(--v4-wide) + 2*var(--gutter));margin:0 auto;padding:0 var(--gutter)}
.v4 .v4-band{padding:var(--v4-band) 0;background:var(--bg)}
.v4 .v4-band.is-alt{background:var(--bg-2)}
.v4 .v4-band.is-center{text-align:center}
.v4 p{margin:0}
.v4 .v4-h1{font-size:clamp(44px,6.4vw,80px);line-height:1.05;letter-spacing:-.035em;font-weight:700;margin:0;color:var(--ink);text-wrap:balance}
.v4 .v4-h2{font-size:clamp(34px,4.4vw,56px);line-height:1.08;letter-spacing:-.03em;font-weight:700;margin:0;color:var(--ink);text-wrap:balance}
.v4 .v4-lead{font-size:clamp(19px,1.9vw,24px);line-height:1.4;letter-spacing:-.015em;color:var(--ink-2);margin-top:20px;text-wrap:pretty}
.v4 .v4-small{font-size:15px;line-height:1.45;color:var(--ink-2)}
.v4 a.v4-link{color:var(--link);text-decoration:none;font-weight:500;display:inline-flex;align-items:center;gap:2px;min-height:44px}
.v4 a.v4-link:hover{text-decoration:underline}
.v4 a.v4-link svg{flex:none}
.v4 .v4-btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:52px;padding:0 28px;border-radius:var(--pill);
  background:var(--accent);color:#fff;font:600 18px/1 var(--f);letter-spacing:-.01em;text-decoration:none;white-space:nowrap;border:0}   /* v4.5 (DD C): border:0, no native button bevel */
.v4 .v4-btn-primary:hover{background:var(--accent-h)}
.v4 .v4-btn-primary:focus-visible,.v4 a:focus-visible,.v4 summary:focus-visible,.v4 button:focus-visible{outline:3px solid var(--link);outline-offset:3px;border-radius:8px}
.v4 .v4-btn-primary:focus-visible{border-radius:var(--pill)}
.v4 .v4-btn-outline{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:var(--pill);
  background:transparent;color:var(--ink);border:1px solid var(--ink);font:600 17px/1 var(--f);white-space:nowrap;cursor:pointer}

/* ---------- HOME */
.v4-home .v4-hero{padding:clamp(56px,9vw,128px) 0 0;text-align:center;background:var(--bg)}
.v4-home .v4-hero .v4-col{max-width:calc(860px + 2*var(--gutter))}
.v4-home .v4-hero .v4-lead{max-width:30em;margin-left:auto;margin-right:auto}
.v4-home .v4-cta{margin-top:36px;display:flex;flex-direction:column;align-items:center;gap:14px}
.v4-home .v4-cta .v4-small{margin:0}
.v4-home .v4-shot{margin:clamp(56px,7vw,96px) auto 0;max-width:calc(560px + 2*var(--gutter));padding:0 var(--gutter)}
.v4-home .v4-shot .v4-frame{position:relative;margin:0 auto;width:min(380px,82vw);aspect-ratio:390/800;border-radius:48px;padding:12px;
  background:#1D1C1A;box-shadow:0 2px 4px rgba(0,0,0,.06),0 24px 48px rgba(0,0,0,.10),0 64px 120px -32px rgba(0,0,0,.28)}
.v4-home .v4-shot .v4-screen{height:100%;border-radius:37px;overflow:hidden;background:var(--bg);padding-top:44px}
.v4-home .v4-shot .v4-frame img{display:block;width:100%;height:auto}
.v4-home .v4-shot .v4-frame::after{content:"";position:absolute;top:22px;left:50%;width:30%;height:22px;margin-left:-15%;border-radius:12px;background:#000}
@media (prefers-color-scheme:dark){.v4-home .v4-shot .v4-frame{background:#2E2C29;box-shadow:0 0 0 1px #3A3A3C,0 40px 100px -30px rgba(0,0,0,.9)}}
/* hero visual is cropped by the band edge, Apple style: band ends mid-phone on desktop */
.v4-home .v4-hero{overflow:hidden}
.v4-home .v4-hero .v4-shot{margin-bottom:-120px}
.v4-home .v4-hero + .v4-band{position:relative;z-index:1}

.v4-home .v4-head{max-width:calc(760px + 2*var(--gutter));margin:0 auto;padding:0 var(--gutter);text-align:center}
.v4-home .v4-levels{list-style:none;margin:clamp(48px,6vw,80px) auto 0;padding:0 var(--gutter);max-width:calc(var(--v4-wide) + 2*var(--gutter));
  display:grid;grid-template-columns:1fr;gap:16px}
@media (min-width:900px){.v4-home .v4-levels{grid-template-columns:1.25fr 1fr 1fr;gap:20px}}
.v4-home .v4-level{background:var(--tile);border-radius:var(--r-lg);padding:clamp(28px,3.4vw,44px);display:flex;flex-direction:column;min-height:100%}
.v4-home .v4-level-n{font-size:15px;font-weight:600;color:var(--ink-2);letter-spacing:-.005em}
.v4-home .v4-level-t{font-size:clamp(28px,2.8vw,36px);line-height:1.1;letter-spacing:-.025em;font-weight:700;margin:10px 0 0;color:var(--ink)}
.v4-home .v4-level-o{font-size:17px;line-height:1.5;color:var(--ink-2);margin-top:12px}
.v4-home .v4-level-m{font-size:15px;color:var(--ink-2);margin-top:auto;padding-top:24px}
.v4-home .v4-level .v4-link{margin-top:auto;padding-top:20px;font-size:17px}
.v4-home .v4-level.is-next .v4-level-t{color:var(--ink-2)}
.v4-home .v4-level.is-next .v4-level-n::after{content:none}
.v4-home .v4-able{list-style:none;margin:clamp(48px,6vw,80px) auto 0;padding:0 var(--gutter);max-width:calc(var(--v4-wide) + 2*var(--gutter));
  display:grid;grid-template-columns:1fr;gap:36px;text-align:center}
@media (min-width:900px){.v4-home .v4-able{grid-template-columns:repeat(3,1fr);gap:48px}}
.v4-home .v4-able strong{display:block;font-size:21px;line-height:1.25;letter-spacing:-.02em;font-weight:600;color:var(--ink)}
.v4-home .v4-able span{display:block;margin-top:8px;font-size:17px;line-height:1.5;color:var(--ink-2)}
.v4-home .v4-statement{font-size:clamp(34px,4.4vw,56px);line-height:1.1;letter-spacing:-.03em;font-weight:700;color:var(--ink);text-wrap:balance}
.v4-home .v4-statement span{color:var(--ink-2)}
.v4-home .v4-hubs{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 32px;margin-top:20px;font-size:19px}
.v4-home .v4-band.is-quiet{padding:clamp(64px,8vw,112px) 0}
.v4-home .v4-band.is-quiet .v4-h3{font-size:clamp(24px,2.4vw,28px);letter-spacing:-.02em;font-weight:600;margin:0;color:var(--ink)}

/* ---------- signup strip (Kit 10113773, plain HTML POST, markup unchanged except classes) */
.v4 .v4-signup{text-align:left}
.v4 .v4-signup h2{font-size:clamp(24px,2.4vw,28px);line-height:1.2;letter-spacing:-.02em;font-weight:600;margin:0;color:var(--ink)}
.v4 .v4-signup form{display:flex;flex-direction:column;gap:12px;margin-top:20px}
.v4 .v4-signup .kf-field{display:flex;flex-direction:column;gap:6px;flex:1}
.v4 .v4-signup label{font-size:15px;font-weight:500;color:var(--ink)}
.v4 .v4-signup .kf-opt{color:var(--ink-2);font-weight:400}
.v4 .v4-signup input[type=text],.v4 .v4-signup input[type=email]{height:48px;padding:0 14px;border-radius:12px;border:1px solid var(--line);
  background:var(--bg);color:var(--ink);font:400 17px var(--f)}
.v4 .v4-signup .kf-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.v4 .v4-signup .v4-btn-outline{align-self:flex-start}
.v4 .v4-signup .signup-fine{font-size:14px;line-height:1.45;color:var(--ink-2);margin-top:14px}
.v4 .v4-signup .signup-fine a{color:var(--link)}
.v4 .v4-signup .signup-fine-extra{margin-top:2px}
.v4 .v4-signup input:user-invalid{border-color:#B42318}
@media (min-width:768px){
  .v4 .v4-signup form{flex-direction:row;align-items:flex-end}
  .v4 .v4-signup .v4-btn-outline{align-self:auto}
}
@media (max-width:767px){.v4 .v4-signup .v4-btn-outline{width:100%}}

/* ---------- LESSON */
.v4-lesson{background:var(--bg)}
.v4-lesson .v4-top{padding:clamp(8px,1.6vw,20px) 0 0}
.v4-lesson .v4-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:44px}
.v4-lesson .v4-back{font-size:15px}
.v4-lesson .v4-lang{display:flex;gap:4px;font-size:15px;font-weight:500}
.v4-lesson .v4-lang a,.v4-lesson .v4-lang span{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:22px;color:var(--link);text-decoration:none}
.v4-lesson .v4-lang span[aria-current]{color:var(--ink);font-weight:600}
.v4-lesson .v4-prog{margin-top:clamp(8px,1.2vw,16px)}
.v4-lesson .v4-prog-l{font-size:15px;font-weight:500;color:var(--ink-2);letter-spacing:-.005em}
.v4-lesson .v4-prog-t{display:block;height:3px;margin-top:10px;border-radius:2px;background:var(--line-2);overflow:hidden;max-width:240px}
.v4-lesson .v4-prog-t i{display:block;height:100%;background:var(--v4-bar);border-radius:2px}
.v4-lesson .v4-lh1{font-size:clamp(34px,3.8vw,48px);line-height:1.08;letter-spacing:-.032em;font-weight:700;margin:14px 0 0;color:var(--ink);text-wrap:balance}
.v4-lesson .v4-lede{font-size:clamp(19px,1.7vw,22px);line-height:1.45;letter-spacing:-.014em;color:var(--ink-2);margin-top:12px;text-wrap:pretty}
.v4-lesson .v4-meta{font-size:15px;color:var(--ink-2);margin-top:12px}
.v4-lesson .v4-meta span+span::before{content:"·";margin:0 8px}
.v4-lesson .v4-make{font-size:17px;line-height:1.5;color:var(--ink);margin-top:8px}
.v4-lesson .v4-row{display:flex;flex-wrap:wrap;align-items:flex-start;column-gap:28px;margin-top:4px}
.v4-lesson .v4-row details[open]{flex-basis:100%;order:2}
.v4-lesson details.v4-why{margin-top:0}
.v4-lesson details summary{list-style:none;cursor:pointer;color:var(--link);font-size:17px;font-weight:500;display:inline-flex;align-items:center;gap:6px;min-height:44px}
.v4-lesson details summary::-webkit-details-marker{display:none}
.v4-lesson details summary::after{content:"";width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translate(-2px,-2px);margin-left:4px}
.v4-lesson details[open] summary::after{transform:rotate(-135deg) translate(-2px,-2px)}
.v4-lesson .v4-why-b{padding:8px 0 4px;font-size:17px;line-height:1.6;color:var(--ink)}
.v4-lesson .v4-why-b>*+*{margin-top:12px}
.v4-lesson .v4-why-b ul{padding-left:20px;margin:8px 0 0}
.v4-lesson .v4-why-b li+li{margin-top:6px}
.v4-lesson .v4-why-b .t2-sub,.v4-lesson .v4-why-b h3{font-size:17px;font-weight:600;margin:16px 0 0}

/* lesson column: one 1080 container, text left-aligned at a 640 measure (Apple Support / Developer Tutorials layout) */
/* default: one centered 640 column. Only a lesson that has a video (main.has-video) widens to 1080 for the side video. */
.v4-lesson.has-video .v4-col{max-width:calc(var(--v4-wide) + 2*var(--gutter))}
.v4-lesson .v4-col>*{max-width:var(--v4-read)}
.v4-lesson .v4-col>.v4-top-grid{max-width:none}
.v4-lesson .v4-top-grid{display:grid;grid-template-columns:1fr;gap:0}
@media (min-width:1024px){.v4-lesson.has-video .v4-top-grid{grid-template-columns:minmax(0,var(--v4-read)) minmax(0,1fr);column-gap:56px;align-items:start}
  .v4-lesson.has-video .v4-top-grid .v4-video{grid-column:2;grid-row:1;margin-top:20px}}
/* video slot: 16:9, hidden until a video exists (builder emits it only when lesson.video is set; mock shows the placeholder) */
.v4-lesson .v4-video{margin:0}
.v4-lesson .v4-video-open{display:none}
@media (max-width:1023px){
  .v4-lesson .v4-video-open{display:inline-flex;align-items:center;gap:8px;min-height:44px;background:none;border:0;padding:0;color:var(--link);font:500 17px var(--f);cursor:pointer}
  .v4-lesson .v4-video-open svg{width:22px;height:22px}
  .v4-lesson .v4-video .v4-video-box{display:none}
  .v4-lesson .v4-video:not(.is-open){display:none}
  .v4-lesson .v4-video.is-open .v4-video-box{display:flex;margin-top:12px}
}
.v4-lesson .v4-video-box{aspect-ratio:16/9;border-radius:var(--r);background:var(--bg-2);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:10px;color:var(--ink-2);font-size:15px}
.v4-lesson .v4-video-box svg{width:56px;height:56px}

/* steps */
.v4-lesson .v4-steps{padding:clamp(28px,3.4vw,44px) 0 0}
.v4-lesson .v4-steps h2,.v4-lesson .v4-check h2,.v4-lesson .v4-finish h2{font-size:clamp(28px,3vw,40px);line-height:1.12;letter-spacing:-.028em;font-weight:700;margin:0;color:var(--ink)}
.v4-lesson ol.v4-ol{list-style:none;margin:clamp(20px,2.2vw,28px) 0 0;padding:0;counter-reset:s}
.v4-lesson .v4-step{counter-increment:s;position:relative}
.v4-lesson .v4-step+.v4-step{margin-top:var(--v4-gap-step)}
.v4-lesson .v4-step h3{font-size:clamp(21px,1.9vw,24px);line-height:1.25;letter-spacing:-.02em;font-weight:600;margin:0;color:var(--ink);display:flex;gap:12px}
.v4-lesson .v4-step h3::before{content:counter(s);flex:none;min-width:1.1em;color:var(--ink-2);font-variant-numeric:tabular-nums}
.v4-lesson .v4-step-b{padding-left:calc(1.1em + 12px)}
.v4-lesson .v4-step-b{font-size:clamp(17px,1.5vw,19px)}
.v4-lesson .v4-step-b>p,.v4-lesson .v4-check p,.v4-lesson .v4-check li{font-size:clamp(17px,1.5vw,19px);line-height:1.6;color:var(--ink)}
.v4-lesson .v4-step-b>*{margin-top:12px}
.v4-lesson .v4-step-b>p+p{margin-top:16px}
.v4-lesson .v4-note{margin-top:var(--v4-gap-step)!important;font-size:15px!important;line-height:1.55!important;color:var(--ink-2)!important}
@media (max-width:767px){.v4-lesson .v4-step-b{padding-left:0}}

/* prompt: the ONE boxed element */
.v4-lesson .v4-prompt{margin-top:20px!important;background:var(--bg-2);border-radius:var(--r);padding:8px 20px 20px}
.v4-lesson .v4-prompt-bar{display:flex;align-items:center;justify-content:space-between;min-height:44px}
.v4-lesson .v4-prompt-bar p{font-size:14px;font-weight:600;color:var(--ink-2);margin:0}
.v4-lesson .v4-copy{background:none;border:0;padding:0 4px;min-height:44px;min-width:44px;color:var(--link);font:600 15px var(--f);cursor:pointer}
.v4-lesson .v4-prompt pre{margin:4px 0 0;white-space:pre-wrap;overflow-wrap:anywhere;font:400 16px/1.6 var(--f);color:var(--ink);max-height:none}
.v4-lesson .v4-prompt pre code{font:inherit}
.v4-lesson .v4-prompt .t2-lab{font-weight:600}
.v4-lesson .ft-status:empty{display:none}
.v4-lesson .ft-status{font-size:14px;color:var(--ink-2)}

/* check */
.v4-lesson .v4-check{padding:var(--v4-band) 0 0}
.v4-lesson .v4-checks{list-style:none;margin:28px 0 0;padding:0}
.v4-lesson .v4-checks li{position:relative;padding-left:32px}
.v4-lesson .v4-checks li+li{margin-top:14px}
.v4-lesson .v4-checks li::before{content:"";position:absolute;left:4px;top:.42em;width:12px;height:7px;border-left:2px solid var(--ink-2);border-bottom:2px solid var(--ink-2);transform:rotate(-45deg)}
.v4-lesson .v4-example{margin-top:32px}
.v4-lesson .v4-example .v4-cap{display:block;margin-top:6px;font-size:15px;color:var(--ink-2)}

/* try: collapsed by default (R4) */
.v4-lesson .v4-try{margin-top:clamp(40px,5vw,64px);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);padding:6px 0}
.v4-lesson .v4-try summary{color:var(--ink);font-weight:600;font-size:19px;min-height:56px;width:100%;justify-content:space-between}
.v4-lesson .v4-try summary .v4-opt{font-weight:400;color:var(--ink-2);font-size:15px;margin-left:8px}
.v4-lesson .v4-try-b{padding:4px 0 24px}
.v4-lesson .v4-try-b>p{font-size:17px;color:var(--ink-2)}
.v4-lesson .v4-try-who{display:block;margin-top:24px;font-size:17px;font-weight:600;color:var(--ink)}
.v4-lesson .v4-try-b .v4-prompt{margin-top:8px!important}
.v4-lesson .v4-sources{border-bottom:1px solid var(--line-2);padding:6px 0}
.v4-lesson .v4-sources summary{color:var(--ink);font-weight:500;font-size:17px;min-height:56px;width:100%;justify-content:space-between}
.v4-lesson .v4-sources summary h2{font:inherit;margin:0}
.v4-lesson .v4-sources-b{padding:0 0 20px;font-size:15px;line-height:1.55;color:var(--ink-2)}
.v4-lesson .v4-sources-b p+p{margin-top:8px}
.v4-lesson .v4-sources-b a{color:var(--link)}

/* finish: one Up next, one button */
.v4-lesson .v4-finish{margin-top:var(--v4-band);background:var(--bg-2);padding:var(--v4-band) 0}
.v4-lesson .v4-done{font-size:clamp(17px,1.5vw,19px);line-height:1.55;color:var(--ink);margin-top:16px}
.v4-lesson .v4-upnext{margin-top:40px}
.v4-lesson .v4-upnext-k{font-size:15px;font-weight:500;color:var(--ink-2)}
.v4-lesson .v4-upnext-t{font-size:clamp(21px,2vw,24px);line-height:1.25;letter-spacing:-.02em;font-weight:600;color:var(--ink);margin-top:6px}
.v4-lesson .v4-finish .v4-btn-primary{margin-top:24px}
.v4-lesson .v4-pager{display:flex;gap:24px;margin-top:24px;font-size:15px}
.v4-lesson .v4-signup-wrap{padding:clamp(64px,8vw,112px) 0}

/* phones: keep Step 1 in the first screen */
@media (max-width:767px){
  .v4-lesson .v4-top{padding-top:8px}
  .v4-lesson .v4-prog{margin-top:8px}
  .v4-lesson .v4-lh1{font-size:32px;margin-top:12px}
  .v4-lesson .v4-lede{font-size:18px;margin-top:10px}
  .v4-lesson .v4-meta{margin-top:10px}
  .v4-lesson .v4-make{margin-top:8px;font-size:16px}
  .v4-lesson .v4-steps{padding-top:20px}
  .v4-lesson .v4-steps h2{font-size:26px}
  .v4-lesson ol.v4-ol{margin-top:20px}
}
@media (max-width:389px){
  .v4-lesson .v4-lh1{font-size:28px;margin-top:10px}
  .v4-lesson .v4-lede{font-size:17px;margin-top:8px}
  .v4-lesson .v4-meta{margin-top:8px;font-size:14px}
  .v4-lesson .v4-make{font-size:15px;margin-top:6px}
  .v4-lesson .v4-steps{padding-top:16px}
  .v4-lesson .v4-steps h2{font-size:24px}
  .v4-lesson ol.v4-ol{margin-top:14px}
  .v4-lesson .v4-step h3{font-size:20px}
}

/* neutralise site.css .ft-card / .ft-pre (hub tip card) inside v4 lessons */
.v4-lesson .ft-card.v4-prompt{display:block;max-width:var(--v4-read);grid-template-columns:none;gap:0;text-align:left}
.v4-lesson .v4-prompt .ft-pre{padding:0;border-radius:0;background:none;max-height:none;overflow:visible;font-size:16px;line-height:1.6}
.v4-lesson .v4-prompt .ft-pre-wrap::after{content:none}
.v4-lesson .v4-copy.ft-copy{min-width:44px;padding:0 4px;font-size:15px}
.v4-lesson .ft-status{text-align:left;margin:0}

/* header/footer small-phone fixes carried over from template-v2-fix3 R3/R4 and fix4 (v4 pages no longer load those files) */
header.site .hubs>summary, header.site nav.top>a{white-space:nowrap}
@media (max-width:400px){
  header.site .header-in{gap:6px;padding-left:16px;padding-right:16px}
  header.site .brand{gap:8px}
  header.site .brand-word{font-size:14.5px;letter-spacing:-.012em}
  header.site .brand .mark{width:20px;height:20px}
  header.site nav.top{gap:0}
  header.site .hubs>summary, header.site nav.top>a{padding:0 5px;font-size:13px}
  header.site .hubs>summary::after{margin-left:5px}
  html:has(main.v4) .foot-top{grid-template-columns:1fr;gap:8px}
  html:has(main.v4) .foot-col h2{margin-top:16px}
}
@media (max-width:359px){header.site .brand-word{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap} header.site .brand{min-width:44px}
  header.site .hubs ul{min-width:228px}}

/* home fine print (affiliate + trademark lines): quiet, small */
.v4-home .v4-fine{padding:40px 0 56px;border-top:1px solid var(--line-2)}
.v4-home .v4-fine p{font-size:13px;line-height:1.5;color:var(--ink-2);text-align:center}
.v4-home .v4-fine p+p{margin-top:6px}
.v4-home .v4-fine a{color:var(--link)}
.v4-home .v4-fine em{font-style:normal}
.v4-home .v4-signup{max-width:640px;margin:0 auto}

/* extra lesson blocks (B5 answer key table, B5 recap): plain type, no boxes */
.v4-lesson .v4-example h3,.v4-lesson .v4-extra h2,.v4-lesson .v4-extra h3{font-size:clamp(21px,1.9vw,24px);line-height:1.25;letter-spacing:-.02em;font-weight:600;margin:32px 0 0;color:var(--ink)}
.v4-lesson .v4-extra{margin-top:clamp(40px,5vw,64px)}
.v4-lesson .v4-extra h2{font-size:clamp(28px,3vw,40px);font-weight:700;letter-spacing:-.028em;margin-top:0}
.v4-lesson .v4-extra p,.v4-lesson .v4-extra li{font-size:clamp(17px,1.5vw,19px);line-height:1.6;color:var(--ink)}
.v4-lesson .v4-extra>*+*{margin-top:16px}
.v4-lesson .v4-extra ul,.v4-lesson .v4-extra ol{padding-left:22px;margin:16px 0 0}
.v4-lesson .v4-extra li+li{margin-top:8px}
.v4-lesson .v4-example>*+*{margin-top:12px}
.v4-lesson .v4-example table,.v4-lesson .v4-extra table{width:100%;border-collapse:collapse;font-size:16px;margin-top:12px}
.v4-lesson .v4-example th,.v4-lesson .v4-example td,.v4-lesson .v4-extra th,.v4-lesson .v4-extra td{padding:10px 12px 10px 0;border-bottom:1px solid var(--line-2);color:var(--ink);text-align:left;vertical-align:top}
.v4-lesson .v4-example th,.v4-lesson .v4-extra th{font-weight:600;font-size:14px;color:var(--ink-2)}
.v4-lesson .lv2-table{overflow-x:auto}
.v4-lesson .v4-step-b img{max-width:100%;height:auto;border-radius:var(--r)}
.v4-lesson .v4-step-b a{color:var(--link)}
/* B5 finish */
.v4-lesson .v4-last{margin-top:8px}
.v4-lesson .v4-last .v4-upnext-k{margin:0 0 6px}
.v4-lesson .v4-signup.is-card{margin-top:40px;padding:clamp(24px,3vw,40px);background:var(--bg);border-radius:var(--r-lg)}
.v4-lesson .v4-signup.is-card .v4-btn-primary{margin-top:0;font-size:17px;min-height:48px}
@media (max-width:767px){.v4-lesson .v4-signup.is-card .v4-btn-primary{width:100%}}

/* ---------- Video component (homepage + Beginner path page). Optional: emitted only when a video exists. */
.v4 .v4-vid-wrap,.v4.v4-vid-wrap{max-width:calc(720px + 2*var(--gutter));margin:clamp(40px,5vw,64px) auto 0;padding:0 var(--gutter)}   /* v4.3 DD 1: also the path page's .v4.v4-vid-wrap */
.v4 .v4-vid{margin:0}
.v4 .v4-vid-box{position:relative;aspect-ratio:16/9;border-radius:var(--r);overflow:hidden;background:#FCF7F2;box-shadow:0 0 0 1px var(--line-2)}
.v4 .v4-vid-el{display:block;width:100%;height:100%;object-fit:cover;background:#FCF7F2}
.v4 .v4-vid-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;width:100%;height:100%;border:0;padding:0;background:transparent;cursor:pointer;color:rgba(29,29,31,.72)}
.v4 .v4-vid-play[hidden]{display:none}
.v4 .v4-vid-play svg{width:64px;height:64px;border-radius:50%;filter:drop-shadow(0 1px 2px rgba(0,0,0,.12)) drop-shadow(0 8px 24px rgba(0,0,0,.18));transition:transform .2s ease}
.v4 .v4-vid-play:hover svg{transform:scale(1.06)}
.v4 .v4-vid-play:focus-visible{outline:none}
.v4 .v4-vid-play:focus-visible svg{outline:2px solid var(--accent);outline-offset:3px}
@media (max-width:600px){.v4 .v4-vid-play svg{width:56px;height:56px}}
.v4 .v4-vid figcaption{margin-top:12px;font-size:15px;line-height:1.45;color:var(--ink-2);text-align:center}
.v4 .v4-vid-tr{margin-top:4px;text-align:center}
.v4 .v4-vid-tr summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;min-height:44px;color:var(--link);font-size:15px;font-weight:500}
.v4 .v4-vid-tr summary::-webkit-details-marker{display:none}
.v4 .v4-vid-tr p{max-width:var(--v4-read);margin:4px auto 0;font-size:15px;line-height:1.6;color:var(--ink-2);text-align:left}
.v4 .v4-vid-tr p+p{margin-top:12px}   /* v5.2b: the path-page transcript has several paragraphs */
.v4 video::cue{font-family:var(--f);font-size:18px;line-height:1.35;color:#fff;background:rgba(0,0,0,.72)}
@media (prefers-color-scheme:dark){.v4 .v4-vid-box{box-shadow:0 0 0 1px var(--line)}}
/* ---------- Steve, Nov 10 8:06 AM CT: desktop hero phone 380 -> 460px at >=1024px; bezel, radii, notch and shadow scaled x1.21. 390 unchanged. */
@media (min-width:1024px){
  .v4-home .v4-shot .v4-frame{width:460px;border-radius:58px;padding:14.5px;
    box-shadow:0 2px 5px rgba(0,0,0,.06),0 29px 58px rgba(0,0,0,.10),0 77px 145px -39px rgba(0,0,0,.28)}
  .v4-home .v4-shot .v4-screen{border-radius:44px;padding-top:53px}
  .v4-home .v4-shot .v4-frame::after{top:27px;height:27px;border-radius:14.5px}
}
@media (min-width:1024px) and (prefers-color-scheme:dark){.v4-home .v4-shot .v4-frame{box-shadow:0 0 0 1px #3A3A3C,0 48px 121px -36px rgba(0,0,0,.9)}}
/* ---------- DD SPEC §5 update (Nov 10): play disc bottom-left so the poster headline stays clear. Whole poster stays the button. No scrim. */
.v4 .v4-vid-play{align-items:flex-end;justify-content:flex-start;padding:0 0 24px 24px;box-sizing:border-box}
.v4 .v4-vid-play svg{width:56px;height:56px}
@media (max-width:600px){.v4 .v4-vid-play{padding:0 0 16px 16px}.v4 .v4-vid-play svg{width:48px;height:48px}}
/* ---- v4.1 (DD, Nov 10) ---- */
/* DD 1: at <=600px the 40px/10px disc can't clear the ES poster headline (measured), so the overlay disc is dropped and a
   quiet text button sits under the poster. The whole poster stays clickable (the overlay button still covers it). */
.v4-vid-text{display:none}
@media (max-width:600px){
  .v4 .v4-vid-play svg{display:none}
  .v4 .v4-vid-play:focus-visible{outline:3px solid var(--link);outline-offset:-3px;border-radius:var(--r)}
  .v4 .v4-vid-text:not([hidden]){display:block;margin:10px auto 0;min-height:44px;padding:11px 8px;text-align:center;text-wrap:balance;background:none;border:0;color:var(--link);font:600 17px/1.2 var(--f);cursor:pointer}
  .v4 .v4-vid-text:hover{text-decoration:underline}
}
/* DD 3a: the path-page signup submit is a text link, so "Start lesson 1" is the one filled button */
button.v4-btn-text{display:inline-flex;align-items:center;min-height:44px;margin-top:8px;padding:0;background:none;border:0;border-radius:0;box-shadow:none;color:var(--link);font:600 17px/1.2 var(--f, inherit);cursor:pointer;width:auto}
button.v4-btn-text:hover{background:none;text-decoration:underline}
button.v4-btn-text:focus-visible{outline:3px solid var(--link);outline-offset:3px;border-radius:8px}
/* DD 4: inner table scroll gets a visible cue. Edge shadows show only on the side that has more to scroll
   (the "local" covers hide them at either end). */
.v4-lesson .lv2-table{--tbl-bg:var(--bg);background:
  linear-gradient(to right,var(--tbl-bg) 30%,transparent) left center/32px 100% no-repeat local,
  linear-gradient(to left,var(--tbl-bg) 30%,transparent) right center/32px 100% no-repeat local,
  radial-gradient(farthest-side at 0 50%,rgba(0,0,0,.16),transparent) left center/12px 100% no-repeat scroll,
  radial-gradient(farthest-side at 100% 50%,rgba(0,0,0,.16),transparent) right center/12px 100% no-repeat scroll}
@media (prefers-color-scheme:dark){.v4-lesson .lv2-table{background:
  linear-gradient(to right,var(--tbl-bg) 30%,transparent) left center/32px 100% no-repeat local,
  linear-gradient(to left,var(--tbl-bg) 30%,transparent) right center/32px 100% no-repeat local,
  radial-gradient(farthest-side at 0 50%,rgba(255,255,255,.22),transparent) left center/12px 100% no-repeat scroll,
  radial-gradient(farthest-side at 100% 50%,rgba(255,255,255,.22),transparent) right center/12px 100% no-repeat scroll}}
/* v4.1: /thanks/ and /thanks/confirmed/ (Steve, Nov 10) */
.v4-thanks .v4-thanks-in{padding:clamp(72px,12vw,160px) 0 clamp(72px,12vw,160px);text-align:center}
.v4-thanks .v4-h1{font-size:clamp(40px,5.6vw,64px)}
.v4-thanks .v4-lead{max-width:26em;margin-left:auto;margin-right:auto}
.v4-thanks .v4-cta{margin-top:32px}
/* ---- v4.3 (DD recheck v4.1, Nov 10) ---- */
/* DD 7: at <=600 the caption drops its duration sentence (the text button already says it) */
@media (max-width:600px){.v4 .v4-vid figcaption .v4-cap-dur{display:none}}
/* DD 8: 390 home: the email heading is centered like the other home bands */
@media (max-width:600px){.v4-home .v4-signup h2{text-align:center}}
/* DD 9: path-page v3 featured illustration hidden (og/share image unchanged) */
.t2-path .t2-path-hero img{display:none}
/* DD 6: the Next button carries the next lesson's title, so it may wrap */
.v4-lesson .v4-upnext .v4-btn-next{white-space:normal;text-align:left;line-height:1.25;padding:12px 24px;max-width:100%}
/* DD 5: EN|ES switch on both homes, same look as the lessons' switch */
.v4-home .v4-lang{display:flex;justify-content:center;gap:4px;margin-top:8px;font-size:15px;font-weight:500}
.v4-home .v4-lang a,.v4-home .v4-lang span{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:22px;color:var(--link);text-decoration:none}
.v4-home .v4-lang span[aria-current]{color:var(--ink);font-weight:600}
.v4-home .v4-lang a:hover{text-decoration:underline}
/* ---------- DD 10: Beginner path page on the v4 template (light + dark via the site.css tokens) */
.v4-path .v4-phero{padding:clamp(8px,1.6vw,20px) 0 var(--v4-band);background:var(--bg)}
.v4-path .v4-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:44px}
.v4-path .v4-back{font-size:15px}
.v4-path .v4-lang{display:flex;gap:4px;font-size:15px;font-weight:500}
.v4-path .v4-lang a,.v4-path .v4-lang span{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:22px;color:var(--link);text-decoration:none}
.v4-path .v4-lang span[aria-current]{color:var(--ink);font-weight:600}
.v4-path .v4-lang a:hover{text-decoration:underline}
.v4-path .v4-kicker{font-size:17px;font-weight:600;line-height:1.3;color:var(--ink-2);letter-spacing:-.01em;margin-top:clamp(24px,4vw,48px)}
.v4-path .v4-lh1{font-size:clamp(34px,3.8vw,48px);line-height:1.08;letter-spacing:-.032em;font-weight:700;margin:10px 0 0;color:var(--ink);text-wrap:balance}
.v4-path .v4-outcome{font-size:21px;line-height:1.4;letter-spacing:-.014em;color:var(--ink-2);margin-top:16px;max-width:640px;text-wrap:pretty}
.v4-path .v4-meta{font-size:15px;color:var(--ink-2);margin-top:14px}
.v4-path .v4-pcta{margin-top:28px}
.v4-path .v4-plist .v4-col{max-width:calc(720px + 2*var(--gutter))}
.v4-path .v4-prows{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-2)}
.v4-path .v4-prows li{border-bottom:1px solid var(--line-2)}
.v4-path .v4-prow{display:flex;align-items:center;gap:16px;min-height:64px;padding:18px 0;color:var(--ink);text-decoration:none}
.v4-path .v4-prow-n{flex:none;width:28px;font-size:17px;font-weight:600;color:var(--ink-2);font-variant-numeric:tabular-nums}
.v4-path .v4-prow-txt{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.v4-path .v4-prow-t{font-size:clamp(19px,1.8vw,21px);line-height:1.25;font-weight:600;letter-spacing:-.015em;color:var(--ink)}
.v4-path .v4-prow-o{font-size:17px;line-height:1.4;color:var(--ink-2)}
.v4-path .v4-prow svg{flex:none;color:var(--ink-2)}
.v4-path .v4-prow:hover .v4-prow-t{text-decoration:underline}
.v4-path .v4-prow:hover svg{color:var(--link)}
.v4-path .v4-prow:focus-visible{outline:3px solid var(--link);outline-offset:2px;border-radius:8px}
.v4-path .v4-nextlvl{margin-top:clamp(32px,4vw,48px);font-size:17px;line-height:1.45;color:var(--ink-2)}
.v4-path .v4-nextlvl strong{color:var(--ink);font-weight:600}
.v4-path .v4-band.is-quiet{padding:clamp(64px,8vw,112px) 0}
@media (max-width:600px){.v4-path .v4-outcome{font-size:19px}.v4-path .v4-pcta .v4-btn-primary{width:100%}}
.v4-path a.v4-prow,.v4-path a.v4-prow span{text-decoration:none}
.v4-path a.v4-prow:hover .v4-prow-t{text-decoration:underline}
/* ---- v4.5 (DD recheck v4.4, Nov 10) ---- */
/* A: each row link's .card-link::after overlay is contained by its own row (it covered the first viewport) */
.v4-path .v4-prow{position:relative}
/* Polish 1: signup fine print sits in the column; one alignment per breakpoint (heading + fine print match):
   >600 left everywhere; <=600 centered on the homes (DD 8), left on path + lessons */
.v4 .v4-signup .signup-fine{margin-left:auto;margin-right:auto}
@media (min-width:601px){.v4 .v4-signup .signup-fine{text-align:left;margin-left:0}}
@media (max-width:600px){.v4:not(.v4-home) .v4-signup h2,.v4:not(.v4-home) .v4-signup .signup-fine{text-align:left;margin-left:0}
  .v4-home .v4-signup .signup-fine{text-align:center}}
/* Polish 2: 44px tap height for the L6 practice-receipt download */
.v4-lesson .t2-dl{display:inline-flex;align-items:center;min-height:44px}
/* Polish 3: the list band has no heading, so its top padding is the short rhythm (was the full band, ~96px extra at 1280) */
.v4-path .v4-plist{padding-top:clamp(40px,5vw,64px)}

/* ---------- v5.2.2 (DD first pass via Steve, Nov 11 1:17 PM CT): Beginner path page (body.page-path-v4) on the brand tokens.
   Styling only, layout unchanged. Values = the home (ayh-cro2.css): Ember primary, ink links with underline, Paper band, filled ink button.
   No blue on the page: the site.css blue tokens (--accent/--accent-h/--link) are re-pointed on this page only. */
body.page-path-v4{--p-ink:#1D1C1A;--p-on-ink:#FFFFFF;--p-paper:#F5F4F1;--accent:#C2410C;--accent-h:#A8380A;--link:#1D1C1A}
@media (prefers-color-scheme:dark){body.page-path-v4{--p-ink:#F5F4F1;--p-on-ink:#0C0B0A;--p-paper:#171614;--link:#F5F4F1}}
body.page-path-v4 .v4 .v4-btn-primary{gap:8px;min-height:56px;padding:0 30px;border-radius:999px;background:#C2410C;color:#fff;font:600 18px/1.2 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;letter-spacing:-.01em}
body.page-path-v4 .v4 .v4-btn-primary:hover{background:#A8380A}
@media (max-width:833px){body.page-path-v4 .v4 .v4-btn-primary{min-height:52px;font-size:17px}}
body.page-path-v4 .v4-path a.v4-back,body.page-path-v4 .v4-path .v4-lang a,body.page-path-v4 .v4-path .v4-vid-tr summary{color:var(--p-ink)}
body.page-path-v4 .v4-path a.v4-back span,body.page-path-v4 .v4-path .v4-lang a,body.page-path-v4 .v4-path .v4-vid-tr summary{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
body.page-path-v4 .v4-path .v4-plist{background:var(--p-paper)}
body.page-path-v4 .v4 .v4-signup .v4-btn-outline{height:52px;min-height:52px;padding:0 26px;border:0;border-radius:999px;background:var(--p-ink);color:var(--p-on-ink);font:600 17px/1 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif}
/* video at desktop: the frame is the width of the 640px text column and lines up with the text (390 unchanged) */
@media (min-width:834px){body.page-path-v4 .v4-path .v4-path-vid{max-width:calc(var(--v4-read) + 2*var(--gutter))}}

/* ---------- v5.2.3 (DD full pass via Steve, Nov 11 1:26 PM CT): Beginner path page surfaces on the brand-kit tokens (tokens.css).
   Light: page #FFFFFF, band Paper #F5F4F1. Dark: page Night #0C0B0A (was #000), band dark Paper #171614, tile #1F1E1B.
   Dark inputs, the consent card and the skip link follow the home's dark surfaces. Text greys are left on the v4 tokens (see REPORT-v523). */
body.page-path-v4{--bg:#FFFFFF;--bg-2:#F5F4F1;--tile:#FFFFFF}
@media (prefers-color-scheme:dark){
  body.page-path-v4{--bg:#0C0B0A;--bg-2:#171614;--tile:#1F1E1B}
  body.page-path-v4 .signup-form input{background:#0C0B0A}
  body.page-path-v4 .consent{background:rgba(31,30,27,.96);border-color:rgba(255,255,255,.1)}
  body.page-path-v4 .consent .consent-btn{background:#2A2825;border-color:#3A3834}
}
body.page-path-v4 .skip{background:var(--p-ink);color:var(--p-on-ink)}
body.page-path-v4 .consent .consent-btn{background:var(--bg-2)}
@media (prefers-color-scheme:dark){body.page-path-v4 .consent .consent-btn{background:#2A2825}}
/* phone/tablet: the frame keeps the home's 24px side inset (342px at 390, 312px at 360); centered in the column, so 4px in from the 20px text edge */
@media (max-width:833px){body.page-path-v4 .v4-path .v4-path-vid .intro-video{margin-left:max(0px,calc(24px - var(--gutter)));margin-right:max(0px,calc(24px - var(--gutter)))}}