/* Web-Learning — shared foundation: tokens, base, helpers, header, footer. */
:root{
  --bg:#f3f2ee; --tile:#ffffff; --tile-2:#e8e6df; --line:#dedbd2;
  --ink:#16191d; --muted:#545a61;
  --green:#1f5a28; --green-2:#143d1b; --link:#1d5426;
  --lime:#dcef7a; --cream:#f6f4ec; --cream-muted:#bfd1bf;
  --code:#16191d; --code-text:#e6e8ea; --code-muted:#9aa3ad;
  --c-green:#8fd694; --c-amber:#f2c46d; --c-blue:#8cc4ff; --c-pink:#f4a3c0;
  --font-sans:'Onest',ui-sans-serif,'Segoe UI',sans-serif; --font-mono:'JetBrains Mono',ui-monospace,Menlo,monospace;
  --wrap:1360px; --r:18px; --r-btn:12px; --gap:14px;
  --pad:clamp(16px,4vw,48px);
  --shadow:0 14px 30px -18px rgba(22,25,29,.35);
  --sc-accent:#1f5a28; --sc-icon-stroke:1.8;
}

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-sans);font-size:1.0625rem;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;display:block}
img{height:auto}
h1,h2,h3,h4{font-weight:700;line-height:1.12;letter-spacing:-.02em;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(2.1rem,4.6vw,3.9rem)}
h2{font-size:clamp(1.6rem,3vw,2.5rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.4rem);letter-spacing:-.01em}
h4{font-size:1.05rem;letter-spacing:0}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 1em;padding-left:1.25em}
a{color:var(--link);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
strong,b{font-weight:600}
small{font-size:.875rem}
code,kbd,pre,samp{font-family:var(--font-mono);font-size:.92em}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0}
button,input,select,textarea{font:inherit;color:inherit}
input,select,textarea{font-size:max(16px,1rem)}
[hidden]{display:none!important}
::selection{background:var(--lime);color:var(--ink)}

:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:4px}
.tile--code :focus-visible,.tile--green :focus-visible,.site-footer :focus-visible,.on-dark :focus-visible,
.tile--code:focus-visible,.tile--green:focus-visible{outline-color:var(--lime)}

/* ---------- layout helpers ---------- */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--pad);width:100%}
.bleed{width:100vw;margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw)}
.grid{display:grid;gap:var(--gap)}
.grid>*{min-width:0}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* bento: 6-column grid; children span with .s-2/.s-3/.s-4/.s-6 and .r-2 */
.bento{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:var(--gap);grid-auto-flow:dense}
.bento>*{min-width:0;grid-column:span 2}
.bento>.s-1{grid-column:span 1}
.bento>.s-2{grid-column:span 2}
.bento>.s-3{grid-column:span 3}
.bento>.s-4{grid-column:span 4}
.bento>.s-5{grid-column:span 5}
.bento>.s-6{grid-column:1 / -1}
.bento>.r-2{grid-row:span 2}
@media (max-width:1024px){
  .bento{grid-template-columns:repeat(4,minmax(0,1fr))}
  .bento>.s-1{grid-column:span 2}
  .bento>.s-3,.bento>.s-4,.bento>.s-5{grid-column:1 / -1}
}
@media (max-width:640px){
  .bento{grid-template-columns:minmax(0,1fr)}
  .bento>*,.bento>.s-1,.bento>.s-2,.bento>.s-3,.bento>.s-4,.bento>.s-5{grid-column:1 / -1}
  .bento>.r-2{grid-row:auto}
}

/* ---------- type helpers ---------- */
.mono,.price{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:0}
.price{font-weight:500;white-space:nowrap}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 .6rem}
.path{display:inline-flex;align-items:center;gap:.45em;font-family:var(--font-mono);font-size:.85rem;font-weight:500;color:var(--muted);margin:0 0 .75rem;letter-spacing:0}
.path::before{content:"";width:.55em;height:.55em;border-radius:2px;background:var(--green);flex:none}
.tile--code .path,.tile--green .path,.on-dark .path{color:var(--cream-muted)}
.tile--code .path{color:var(--code-muted)}
.tile--code .path::before,.tile--green .path::before,.on-dark .path::before{background:var(--lime)}
.tile--code .eyebrow{color:var(--code-muted)}
.tile--green .eyebrow{color:var(--cream-muted)}
.lead{font-size:clamp(1.08rem,1.4vw,1.25rem);color:var(--muted);max-width:60ch}

.chip{display:inline-flex;align-items:center;gap:.4em;min-height:30px;padding:.2em .8em;border-radius:999px;background:var(--tile-2);color:var(--ink);font-size:.85rem;font-weight:500;text-decoration:none;line-height:1.3}
a.chip:hover{background:var(--ink);color:#fff}
.tile--code .chip{background:rgba(255,255,255,.1);color:var(--code-text)}
.tile--green .chip{background:rgba(255,255,255,.14);color:var(--cream)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;min-height:48px;padding:.6em 1.35em;border-radius:var(--r-btn);border:1.5px solid var(--green);background:var(--green);color:var(--cream);font-family:var(--font-sans);font-weight:600;font-size:1rem;line-height:1.2;text-decoration:none;cursor:pointer;text-align:center;transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease}
.btn:hover{background:var(--green-2);border-color:var(--green-2);color:var(--cream);transform:translateY(-2px);text-decoration:none}
.btn:active{transform:none}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn--ghost:hover{background:var(--ink);border-color:var(--ink);color:#fff}
.btn--sm{min-height:44px;padding:.45em 1em;font-size:.95rem}
.btn--light{background:var(--cream);border-color:var(--cream);color:var(--green)}
.btn--light:hover{background:#fff;border-color:#fff;color:var(--green-2)}
.btn--light.btn--ghost,.tile--green .btn--ghost,.tile--code .btn--ghost,.on-dark .btn--ghost{background:transparent;color:var(--cream);border-color:var(--cream)}
.btn--light.btn--ghost:hover,.tile--green .btn--ghost:hover,.tile--code .btn--ghost:hover,.on-dark .btn--ghost:hover{background:var(--cream);color:var(--green-2)}
.tile--green .btn:not(.btn--ghost),.tile--code .btn:not(.btn--ghost){background:var(--cream);border-color:var(--cream);color:var(--green)}
.tile--green .btn:not(.btn--ghost):hover,.tile--code .btn:not(.btn--ghost):hover{background:#fff;border-color:#fff;color:var(--green-2)}
.btn.is-in{background:var(--tile-2);border-color:var(--line);color:var(--ink)}
.add-form{display:inline-flex;margin:0}

/* ---------- tiles ---------- */
.tile{position:relative;background:var(--tile);border:1px solid var(--line);border-radius:var(--r);padding:clamp(20px,2.4vw,32px);overflow:hidden;transition:transform .25s ease,box-shadow .25s ease}
.tile.is-link:hover,a.tile:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
a.tile{display:block;color:inherit;text-decoration:none}
.tile--code{background:var(--code);border-color:var(--code);color:var(--code-text)}
.tile--code a{color:var(--lime)}
.tile--lime{background:var(--lime);border-color:var(--lime);color:var(--ink)}
.tile--lime a:not(.btn){color:var(--ink)}
.tile--green{background:var(--green);border-color:var(--green);color:var(--cream)}
.tile--green a{color:var(--cream)}
.tile--photo{padding:0}
.tile--photo img{width:100%;height:100%;object-fit:cover}

/* ---------- code / editor ---------- */
.code{background:var(--code);color:var(--code-text);border-radius:var(--r);overflow:hidden;font-family:var(--font-mono);font-size:.88rem;line-height:1.75}
.code pre{margin:0;padding:18px 20px 22px;overflow-x:auto;font-size:inherit;tab-size:2}
.code pre code{font-size:inherit}
.code ol{list-style:none;margin:0;padding:18px 20px 22px;counter-reset:ln}
.code ol>li{counter-increment:ln;white-space:pre;padding-left:3em;position:relative}
.code ol>li::before{content:counter(ln);position:absolute;left:0;width:2em;text-align:right;color:var(--code-muted);font-variant-numeric:tabular-nums}
.code .ln{display:inline-block;width:2em;margin-right:1em;text-align:right;color:var(--code-muted);user-select:none;font-variant-numeric:tabular-nums}
.code-bar{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.1);background:rgba(255,255,255,.04)}
.code-bar>i{width:10px;height:10px;border-radius:50%;background:#4a5058;flex:none}
.code-bar>i:nth-child(1){background:var(--c-pink)}
.code-bar>i:nth-child(2){background:var(--c-amber)}
.code-bar>i:nth-child(3){background:var(--c-green)}
.code-bar>span,.code-bar>b{margin-left:10px;padding:3px 12px;border-radius:7px 7px 0 0;background:var(--code);border:1px solid rgba(255,255,255,.12);border-bottom-color:var(--code);color:var(--code-text);font-family:var(--font-mono);font-size:.8rem;font-weight:500;margin-bottom:-11px;padding-bottom:7px}
.tile--code .code-bar{margin:calc(clamp(20px,2.4vw,32px) * -1) calc(clamp(20px,2.4vw,32px) * -1) 16px}
.t-tag{color:var(--c-pink)}
.t-attr{color:var(--c-amber)}
.t-str{color:var(--c-green)}
.t-kw{color:var(--c-blue)}
.t-com{color:var(--code-muted);font-style:italic}
.t-num{color:var(--c-amber)}

.caret{display:inline-block;width:3px;height:.95em;margin-left:.08em;vertical-align:-.08em;background:var(--green);animation:caret 1.1s steps(1,end) infinite}
.tile--code .caret,.tile--green .caret,.on-dark .caret{background:var(--lime)}
.tile--lime .caret{background:var(--ink)}
@keyframes caret{0%,50%{opacity:1}50.01%,100%{opacity:0}}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:var(--r);background:var(--tile);max-width:100%}
.tbl{width:100%;border-collapse:collapse;font-size:.95rem}
.tbl th,.tbl td{text-align:left;vertical-align:top;padding:12px 16px;border-bottom:1px solid var(--line)}
.tbl thead th{font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--bg)}
.tbl tbody tr:last-child>*{border-bottom:0}
.tbl .num,.tbl td.price{font-family:var(--font-mono);font-variant-numeric:tabular-nums;white-space:nowrap}

/* ---------- reveal (hidden ONLY when JS runs) ---------- */
html.js .reveal{opacity:0;transform:translateY(20px);transition:opacity .45s ease,transform .45s ease}
html.js .reveal.in{opacity:1;transform:none}
html.js .reveal[data-delay="1"]{transition-delay:.08s}
html.js .reveal[data-delay="2"]{transition-delay:.16s}
html.js .reveal[data-delay="3"]{transition-delay:.24s}

/* ---------- skip link ---------- */
.site-skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--ink);color:#fff;padding:10px 16px;border-radius:var(--r-btn);text-decoration:none;font-weight:600}
.site-skip:focus{top:12px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(243,242,238,.92);-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.site-bar{display:flex;align-items:center;gap:clamp(12px,2vw,28px);min-height:72px}
.site-logo{display:inline-flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:700;font-size:1.2rem;letter-spacing:-.02em;flex:none;min-height:44px}
.site-logo:hover{text-decoration:none}
.site-logo img{width:44px;height:44px}
.site-nav{order:2;display:flex;align-items:center;gap:clamp(10px,1.6vw,24px);flex:1;min-width:0}
.site-links{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.site-links a{display:inline-flex;align-items:center;min-height:44px;padding:0 10px;border-radius:10px;color:var(--ink);text-decoration:none;font-weight:500;font-size:.98rem;white-space:nowrap}
.site-links a:hover{background:var(--tile-2)}
.site-links a[aria-current="page"]{background:var(--tile);box-shadow:inset 0 0 0 1px var(--line);font-weight:600}
.site-search{display:flex;align-items:center;margin-left:auto;position:relative;min-width:0}
.site-search input{width:clamp(150px,16vw,240px);min-height:44px;padding:0 44px 0 14px;border:1px solid var(--line);border-radius:var(--r-btn);background:var(--tile);color:var(--ink);font-family:var(--font-sans)}
.site-search input::placeholder{color:var(--muted)}
.site-search input:focus{outline:2px solid var(--green);outline-offset:1px;border-color:var(--green)}
.site-search button{position:absolute;right:2px;top:50%;transform:translateY(-50%);width:40px;height:40px;border:0;background:transparent;color:var(--ink);cursor:pointer;display:grid;place-items:center;border-radius:10px}
.site-search button:hover{background:var(--tile-2)}
.site-search svg{width:18px;height:18px}
.site-cart{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 14px;border-radius:var(--r-btn);background:var(--ink);color:#fff;text-decoration:none;font-weight:600;font-size:.95rem;white-space:nowrap;flex:none;order:3}
.site-cart:hover{background:var(--green);color:var(--cream);text-decoration:none}
.site-cart[aria-current="page"]{background:var(--green);color:var(--cream)}
.site-cart .mono{display:inline-grid;place-items:center;min-width:24px;height:24px;padding:0 6px;border-radius:999px;background:var(--lime);color:var(--ink);font-size:.8rem;font-weight:500}
.site-cart svg{width:18px;height:18px}
.site-menu-btn{display:none;align-items:center;gap:8px;min-height:44px;padding:0 14px;border:1.5px solid var(--ink);border-radius:var(--r-btn);background:transparent;color:var(--ink);font-weight:600;cursor:pointer;margin-left:auto}
.site-menu-btn svg{width:18px;height:18px}

@media (max-width:1180px){
  .site-search input{width:150px}
  .site-links a{padding:0 8px;font-size:.94rem}
}
@media (max-width:1060px){
  .site-bar{flex-wrap:wrap;column-gap:10px}
  .site-cart{margin-left:auto;order:1}
  html.js .site-menu-btn{display:inline-flex;margin-left:0;order:2}
  .site-nav{order:10;flex-basis:100%;flex-direction:column;align-items:stretch;gap:12px;padding:4px 0 18px}
  html.js .site-nav{display:none}
  html.js .site-header.is-open .site-nav{display:flex}
  .site-links{flex-direction:column;align-items:stretch}
  .site-links a{min-height:48px;padding:0 12px;font-size:1.05rem}
  .site-search{margin-left:0}
  .site-search input{width:100%}
}
@media (max-width:420px){
  .site-logo span{font-size:1.05rem}
  .site-menu-btn span,.site-cart-label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .site-cart,.site-menu-btn{padding:0 10px}
}

main{display:block;min-height:50vh}

/* ---------- payment strip ---------- */
.site-pay{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px}
.site-pay ul{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.site-pay li{display:inline-flex;background:#fff;border-radius:5px;padding:2px}
.site-pay img{height:26px;width:auto}
.site-pay p{margin:0;font-size:.875rem;color:var(--muted)}
.site-footer .site-pay p,.tile--green .site-pay p,.on-dark .site-pay p{color:var(--cream-muted)}
.tile--code .site-pay p{color:var(--code-muted)}

/* ---------- footer ---------- */
.site-footer{background:var(--code);color:var(--code-text);margin-top:clamp(56px,8vw,112px);padding:clamp(44px,6vw,80px) 0 28px}
.site-footer a{color:var(--code-text);text-decoration:none}
.site-footer a:hover{color:var(--lime);text-decoration:underline}
.site-foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:clamp(24px,4vw,56px)}
.site-foot-grid>*{min-width:0}
.site-foot-brand img{width:88px;height:88px;margin-bottom:16px}
.site-foot-brand p{color:var(--code-muted);max-width:34ch;margin:0}
.site-foot-brand b{display:block;color:var(--cream);font-size:1.25rem;margin-bottom:6px;letter-spacing:-.01em}
.site-foot-col h2{font-family:var(--font-mono);font-size:.8rem;font-weight:500;letter-spacing:.04em;color:var(--code-muted);margin:0 0 14px;text-transform:none}
.site-foot-col ul{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.site-foot-col a{display:inline-flex;align-items:center;min-height:36px;font-size:.97rem}
.site-foot-base{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:18px;margin-top:clamp(36px,5vw,60px);padding-top:24px;border-top:1px solid rgba(255,255,255,.12)}
.site-footer .site-pay p{color:var(--code-muted)}
.site-copy{margin:0;font-family:var(--font-mono);font-size:.85rem;color:var(--code-muted)}
@media (max-width:900px){
  .site-foot-grid{grid-template-columns:1fr 1fr}
  .site-foot-brand{grid-column:1 / -1}
}
@media (max-width:520px){
  .site-foot-grid{grid-template-columns:1fr}
  .site-foot-col a{min-height:44px}
}

/* ---------- 404 + contact (A1 pages) ---------- */
.site-page{padding-top:clamp(24px,4vw,48px)}
.site-404 .bento{min-height:min(70vh,640px)}
.site-404-code{font-size:clamp(4rem,12vw,9rem);line-height:.9;font-weight:500;color:var(--lime);margin:0 0 .2em}
.site-404 .site-search-big,.site-search-big{display:flex;gap:10px;flex-wrap:wrap;margin-top:1rem}
.site-search-big input{flex:1 1 220px;min-width:0;min-height:48px;padding:0 14px;border:1px solid var(--line);border-radius:var(--r-btn);background:var(--tile)}
.site-search-big input:focus{outline:2px solid var(--green);outline-offset:1px}
.site-linklist{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.site-linklist a{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:48px;padding:6px 0;border-bottom:1px solid var(--line);color:var(--ink);text-decoration:none;font-weight:500}
.site-linklist a:hover{color:var(--green)}
.site-linklist a::after{content:"\2192";font-family:var(--font-mono);color:var(--green)}
.tile--lime .site-linklist a{border-bottom-color:rgba(22,25,29,.18)}
.tile--lime .site-linklist a::after,.tile--lime .site-linklist a:hover{color:var(--ink)}
.site-contact-mail{font-family:var(--font-mono);font-size:clamp(1.05rem,2.4vw,1.6rem);font-weight:500;word-break:break-all;color:var(--lime)}
.site-contact .tile h2{font-size:clamp(1.3rem,2vw,1.7rem)}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js .reveal{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .caret{animation:none}
  .btn:hover,.tile.is-link:hover,a.tile:hover{transform:none}
}
.site-contact-faq{grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,40px)}
@media (max-width:900px){.site-contact-faq{grid-template-columns:1fr}}
@media (max-width:380px){
  .site-bar{column-gap:8px}
  .site-logo{gap:8px}
  .site-cart svg{display:none}
}