/* =========================================================
   screen.css
   ========================================================= */

:root{
  --brand:#0f8f7f;
  --brand-deep:#0c7064;
  --brand-soft:#dff3f0;
  --ink:#1b2430;
  --ink-2:#56616f;
  --ink-3:#8a93a0;
  --paper:#ffffff;
  --mist:#f4f6f5;
  --edge:#e4e8e7;
  --edge-2:#eef1f0;
  --head:#10171f;
  --night:#10171f;
  --night-2:#9aa4ad;
  --sh-1:0 1px 2px rgba(16,23,31,.05);
  --sh-2:0 8px 20px rgba(16,23,31,.08);
  --sh-3:0 18px 40px rgba(16,23,31,.14);
  --rs:7px; --rm:11px; --rl:15px;
  --bar:58px;
  --col:760px;
  --max:1080px;
  --tr:.22s ease;
  --ff:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,
       "Apple Color Emoji","Segoe UI Emoji",sans-serif;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--ff);line-height:1.7;color:var(--ink);background:var(--mist);
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,svg{display:block;max-width:100%;height:auto}
a{color:var(--brand);text-decoration:none;transition:color var(--tr)}
a:hover{color:var(--brand-deep)}
ul,ol{list-style:none}
button{font-family:inherit}
h1{color:var(--head);font-weight:800;line-height:1.22}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* progress */
.scrollbar{position:fixed;top:0;left:0;width:0;height:3px;z-index:1000;
  background:linear-gradient(90deg,var(--brand),#37c2ad);transition:width .1s linear}

/* fixed header (content sits first in the DOM) */
.topnav{position:fixed;top:0;left:0;right:0;height:var(--bar);z-index:900;
  background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--edge-2);
  transition:transform var(--tr),box-shadow var(--tr)}
.topnav.is-shadow{box-shadow:var(--sh-2)}
.topnav.is-hidden{transform:translateY(-100%)}
.topnav__inner{display:flex;align-items:center;height:100%;gap:22px}
.logo{display:inline-flex;align-items:center;flex-shrink:0}
.logo img{height:28px;width:auto}
.menu{display:flex;align-items:center;flex:1;gap:18px}
.menu-list{display:flex;align-items:center;gap:2px}
.menu-auth{display:flex;align-items:center;gap:10px;margin-left:auto}
.menu-link{display:inline-flex;align-items:center;padding:8px 14px;
  font-size:.9375rem;font-weight:600;color:var(--ink-2);border-radius:var(--rs);
  transition:color var(--tr),background var(--tr)}
.menu-link:hover{color:var(--ink);background:var(--mist)}
.burger{display:none;flex-direction:column;justify-content:center;gap:5px;
  width:34px;height:34px;padding:5px;background:none;border:0;cursor:pointer}
.burger span{display:block;height:2px;width:100%;background:var(--ink);
  border-radius:2px;transition:transform var(--tr),opacity var(--tr)}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* buttons */
.act{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;font-size:.9375rem;font-weight:700;line-height:1.4;color:#fff;
  background:var(--brand);border:2px solid var(--brand);border-radius:var(--rm);
  cursor:pointer;transition:background var(--tr),border-color var(--tr),transform .14s ease}
.act:hover{background:var(--brand-deep);border-color:var(--brand-deep);color:#fff}
.act:active{transform:scale(.97)}
.act--sm{padding:6px 16px;font-size:.8125rem}
.act--line{background:transparent;color:var(--brand)}
.act--line:hover{background:var(--brand);color:#fff}
.act--ico{padding:11px 15px;flex-shrink:0}
.act--soft{background:var(--ink-2);border-color:var(--ink-2)}
.act--block{width:100%;margin-top:4px}

/* page / reading column (content first, under fixed bar) */
.page{padding-top:var(--bar);min-height:100vh;padding-bottom:60px}
.read{max-width:var(--col);margin:0 auto;padding:28px 24px 0}
#contact,#comments{scroll-margin-top:calc(var(--bar) + 18px)}

/* article */
.post{background:var(--paper);border:1px solid var(--edge);border-radius:var(--rl);overflow:hidden}
.post-head{padding:30px 32px;border-bottom:1px solid var(--edge-2)}
.post-title{font-size:2rem;margin-bottom:14px}
.post-info{display:flex;flex-wrap:wrap;gap:18px}
.info-bit{display:inline-flex;align-items:center;gap:6px;font-size:.8125rem;color:var(--ink-3)}
.info-bit svg{flex-shrink:0;opacity:.65}

/* contents */
.toc{margin:24px 32px 0;padding:18px 22px;background:var(--mist);
  border:1px solid var(--edge-2);border-radius:var(--rm)}
.toc-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.toc-name{font-weight:700;font-size:.9375rem;color:var(--head)}
.toc-btn{background:none;border:0;font-size:.8125rem;color:var(--brand);cursor:pointer}
.toc-list{display:flex;flex-direction:column;gap:5px}
.toc-list a{display:block;font-size:.875rem;color:var(--ink-2);padding:3px 0;transition:color var(--tr)}
.toc-list a:hover{color:var(--brand)}
.toc-list a.lvl-3{padding-left:16px;font-size:.8125rem}
.toc-list a.lvl-4{padding-left:32px;font-size:.8125rem;color:var(--ink-3)}
.toc-list.is-collapsed{display:none}

/* article body */
.post-body{padding:28px 32px;font-size:1.0625rem;line-height:1.8}
.post-body h2{font-size:1.5rem;margin:1.9em 0 .7em;padding-top:.4em;color:var(--head);font-weight:700;line-height:1.3}
.post-body h3{font-size:1.25rem;margin:1.7em 0 .55em;color:var(--head);font-weight:700;line-height:1.3}
.post-body h4{font-size:1.0625rem;margin:1.5em 0 .5em;color:var(--head);font-weight:700}
.post-body p{margin-bottom:1.25em}
.post-body ul,.post-body ol{margin:1em 0 1.5em 1.4em}
.post-body ul{list-style:disc}
.post-body ol{list-style:decimal}
.post-body li{margin-bottom:.5em;padding-left:.2em}
.post-body img{border-radius:var(--rm);margin:1.5em 0}
.post-body a{color:var(--brand);text-decoration:underline;
  text-decoration-color:rgba(15,143,127,.34);text-underline-offset:2px}
.post-body a:hover{text-decoration-color:var(--brand)}
.post-body blockquote{border-left:4px solid var(--brand);padding:1em 1.4em;margin:1.5em 0;
  background:var(--mist);border-radius:0 var(--rs) var(--rs) 0;color:var(--ink-2);font-style:italic}
.post-body pre{background:var(--mist);border:1px solid var(--edge);border-radius:var(--rm);
  padding:16px 20px;overflow-x:auto;font-size:.875rem;margin:1.5em 0}
.post-body code{background:var(--mist);padding:2px 6px;border-radius:3px;font-size:.9em}
.post-body pre code{background:none;padding:0}
.post-body table{width:100%;border-collapse:collapse;margin:1.5em 0;font-size:.9375rem}
.post-body th,.post-body td{padding:10px 14px;border:1px solid var(--edge);text-align:left}
.post-body th{background:var(--mist);font-weight:700;color:var(--head)}

/* share */
.post-share{display:flex;align-items:center;gap:16px;flex-wrap:wrap;
  padding:22px 32px;border-top:1px solid var(--edge-2)}
.post-share__txt{font-size:.875rem;font-weight:700;color:var(--ink-2)}
.post-share__row{display:flex;gap:8px}
.sdot{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;
  border-radius:var(--rm);border:1px solid var(--edge);background:var(--paper);color:var(--ink-2);
  cursor:pointer;font-size:.72rem;font-weight:700;
  transition:background var(--tr),border-color var(--tr),color var(--tr)}
.sdot:hover{background:var(--brand);border-color:var(--brand);color:#fff}
.sdot svg{pointer-events:none}

/* cards (sections w/ span labels) */
.card{background:var(--paper);border:1px solid var(--edge);border-radius:var(--rl);
  padding:26px 30px;margin-top:24px}
.card-label{display:block;font-size:1.2rem;font-weight:800;color:var(--head);margin-bottom:18px}
.card-text{font-size:.875rem;color:var(--ink-2);margin-bottom:16px}

/* related */
.linkrow{display:flex;flex-direction:column;gap:12px}
.linkrow__item{display:block;padding:14px 18px;background:var(--mist);border-radius:var(--rm);
  transition:background var(--tr),transform .14s ease}
.linkrow__item:hover{background:var(--brand-soft);transform:translateX(4px)}
.linkrow__item span{font-size:.9375rem;font-weight:600;color:var(--ink)}

/* forms */
.inp{width:100%;padding:11px 14px;font-size:.9375rem;color:var(--ink);background:var(--paper);
  border:1px solid var(--edge);border-radius:var(--rm);outline:none;appearance:none;
  transition:border-color var(--tr),box-shadow var(--tr)}
.inp:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(15,143,127,.13)}
.inp--big{resize:vertical;min-height:120px}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.frm .inp--big{margin-bottom:16px}
.frm .inp{margin-bottom:0}
.mini-form{display:flex;gap:8px}
.mini-form .inp{flex:1}

/* connect band (newsletter + contact) */
.connect{max-width:var(--max);margin:48px auto 0;padding-top:40px;border-top:1px solid var(--edge)}
.connect-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start;padding:0}
.connect .card{margin-top:0}

/* footer */
.foot{background:var(--night);color:var(--night-2);padding:42px 0}
.foot__inner{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.foot-brand img{height:26px;width:auto;filter:brightness(0) invert(1)}
.foot-copy{font-size:.8125rem}
.foot-links{display:flex;gap:22px;flex-wrap:wrap}
.foot-links a{font-size:.875rem;color:var(--night-2);transition:color var(--tr)}
.foot-links a:hover{color:#fff}
.soc{display:flex;gap:10px}
.soc-link{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  border-radius:9px;background:rgba(255,255,255,.08);color:var(--night-2);
  transition:background var(--tr),color var(--tr)}
.soc-link:hover{background:var(--brand);color:#fff}

/* back to top */
.up{position:fixed;bottom:24px;right:24px;width:44px;height:44px;display:flex;
  align-items:center;justify-content:center;background:var(--brand);color:#fff;border:0;
  border-radius:50%;cursor:pointer;box-shadow:var(--sh-3);z-index:800;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity var(--tr),visibility var(--tr),transform var(--tr),background var(--tr)}
.up.is-on{opacity:1;visibility:visible;transform:translateY(0)}
.up:hover{background:var(--brand-deep)}

/* modals (pure CSS :target) */
.modal{position:fixed;inset:0;z-index:1100;display:none;align-items:center;justify-content:center;padding:20px}
.modal:target{display:flex}
.modal__veil{position:absolute;inset:0;background:rgba(12,18,26,.55);
  backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px)}
.modal__box{position:relative;z-index:1;width:100%;max-width:380px;background:var(--paper);
  border-radius:var(--rl);padding:30px 28px 28px;box-shadow:var(--sh-3)}
.modal__close{position:absolute;top:12px;right:12px;width:32px;height:32px;display:flex;
  align-items:center;justify-content:center;color:var(--ink-3);border-radius:8px}
.modal__close:hover{background:var(--mist);color:var(--ink)}
.modal__label{display:block;font-size:1.3rem;font-weight:800;color:var(--head);
  text-align:center;margin-bottom:20px}
.modal .frm .inp{margin-bottom:14px}
.modal__alt{font-size:.85rem;color:var(--ink-2);text-align:center;margin-top:14px}

/* =========================================================
   responsive
   ========================================================= */
@media (max-width:768px){
  :root{--bar:54px}
  .burger{display:flex;margin-left:auto}
  .menu{display:none;position:absolute;top:var(--bar);left:0;right:0;flex-direction:column;
    align-items:stretch;gap:8px;background:var(--paper);border-bottom:1px solid var(--edge);
    box-shadow:var(--sh-3);padding:16px 24px}
  .menu.is-open{display:flex}
  .menu-list{flex-direction:column;align-items:stretch}
  .menu-auth{margin-left:0}
  .read{padding-left:16px;padding-right:16px}
  .post-head,.post-body,.post-share{padding-left:20px;padding-right:20px}
  .toc{margin-left:20px;margin-right:20px}
  .card{padding:20px}
  .post-title{font-size:1.625rem}
  .duo{grid-template-columns:1fr}
  .connect-grid{grid-template-columns:1fr}
  .post-share{flex-direction:column;align-items:flex-start}
  .foot__inner{flex-direction:column;align-items:flex-start;gap:20px}
}
@media (max-width:480px){
  .post-title{font-size:1.4rem}
  .post-body{font-size:1rem}
}

/* print */
@media print{
  .topnav,.scrollbar,.up,.post-share,.connect,.foot,.modal{display:none!important}
  .page{padding-top:0}
  .read{max-width:none}
  .post,.card{border:0!important}
}