:root{
  --bg:#080b16; --bg2:#0d1224; --panel:#11182d; --panel2:#16213c; --text:#f4f7ff; --muted:#b8c2df;
  --line:rgba(255,255,255,.13); --accent:#7dd3fc; --accent2:#c4b5fd; --accent3:#f9a8d4; --accent4:#86efac;
  --warn:#fcd34d; --radius:24px; --max:1220px; --shadow:0 28px 90px rgba(0,0,0,.38)
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65;background:radial-gradient(circle at 15% 5%,rgba(125,211,252,.22),transparent 28rem),radial-gradient(circle at 85% 2%,rgba(249,168,212,.18),transparent 30rem),radial-gradient(circle at 60% 45%,rgba(134,239,172,.08),transparent 34rem),var(--bg)}
a{color:inherit}.site-header{position:sticky;top:0;z-index:50;backdrop-filter:blur(20px);background:rgba(8,11,22,.75);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:13px clamp(18px,4vw,44px)}
.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-weight:850;letter-spacing:-.035em}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:15px;background:conic-gradient(from 210deg,#7dd3fc,#c4b5fd,#f9a8d4,#fcd34d,#86efac,#7dd3fc);color:#07111f;font-weight:950;box-shadow:0 8px 28px rgba(125,211,252,.22)}
.top-nav{display:flex;gap:6px;align-items:center}.top-nav a{padding:9px 11px;border-radius:999px;color:var(--muted);text-decoration:none;font-weight:750;font-size:.95rem}.top-nav a:hover{background:rgba(255,255,255,.07);color:var(--text)}.menu-toggle{display:none;background:var(--panel2);color:var(--text);border:1px solid var(--line);border-radius:12px;padding:8px 12px}
.shell{display:grid;grid-template-columns:292px minmax(0,1fr);gap:34px;max-width:var(--max);margin:0 auto;padding:30px clamp(18px,4vw,44px)}.sidebar{position:sticky;top:84px;align-self:start;background:linear-gradient(180deg,rgba(17,24,45,.9),rgba(12,18,35,.86));border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}.sidebar-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.14em;color:var(--muted);font-weight:900;margin:4px 0 10px}.page-filter{width:100%;background:#090f21;color:var(--text);border:1px solid var(--line);border-radius:14px;padding:10px 12px;margin-bottom:12px}.side-nav{display:grid;gap:4px}.side-group{margin:8px 0}.side-group-title{display:flex;gap:8px;align-items:center;color:#eaf6ff;font-weight:900;font-size:.92rem;margin:14px 0 5px}.side-nav a{display:block;padding:8px 10px;border-radius:12px;text-decoration:none;color:var(--muted);font-weight:650;font-size:.94rem}.side-nav a:hover,.side-nav a.active{color:var(--text);background:rgba(255,255,255,.065)}.side-nav .child{padding-left:26px;font-size:.88rem}.content{min-width:0}.hero{position:relative;overflow:hidden;padding:68px clamp(20px,4vw,48px);border:1px solid var(--line);border-radius:32px;background:linear-gradient(135deg,rgba(17,24,45,.85),rgba(22,33,60,.68));box-shadow:var(--shadow);margin:14px 0 28px}.hero:before{content:"";position:absolute;inset:auto -10% -45% -10%;height:220px;background:conic-gradient(from 180deg at 50% 50%,#7dd3fc,#c4b5fd,#f9a8d4,#fcd34d,#86efac,#7dd3fc);filter:blur(32px);opacity:.36}.hero > *{position:relative}.eyebrow{display:inline-flex;gap:8px;align-items:center;color:#dff7ff;border:1px solid rgba(125,211,252,.35);background:rgba(125,211,252,.10);border-radius:999px;padding:7px 11px;font-size:.9rem;font-weight:850}.hero h1{font-size:clamp(2.3rem,6vw,5.25rem);line-height:.96;letter-spacing:-.07em;margin:20px 0 18px;max-width:930px}.lead{font-size:clamp(1.08rem,2vw,1.34rem);color:var(--muted);max-width:790px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-flex;align-items:center;gap:8px;justify-content:center;border-radius:999px;padding:12px 18px;font-weight:850;text-decoration:none;border:1px solid var(--line)}.button.primary{background:linear-gradient(135deg,var(--accent),var(--accent2),var(--accent3));color:#07111f;border:0}.button.secondary{background:rgba(255,255,255,.06);color:var(--text)}
.section-strip{margin:24px 0;padding:22px;border-radius:24px;border:1px solid rgba(125,211,252,.22);background:linear-gradient(90deg,rgba(125,211,252,.12),rgba(196,181,253,.10),rgba(249,168,212,.10));text-align:center}.section-strip strong{font-size:1.15rem}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:22px 0 34px}.card-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card{position:relative;overflow:hidden;background:linear-gradient(180deg,rgba(255,255,255,.078),rgba(255,255,255,.035));border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-decoration:none;box-shadow:0 16px 50px rgba(0,0,0,.20);transition:transform .18s ease,border-color .18s ease,background .18s ease;min-height:154px}.card:after{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2),var(--accent3),var(--accent4));opacity:.75}.card:hover{transform:translateY(-3px);border-color:rgba(125,211,252,.55);background:linear-gradient(180deg,rgba(255,255,255,.095),rgba(255,255,255,.042))}.card .icon{font-size:1.6rem}.card h3{margin:8px 0 8px;font-size:1.16rem;letter-spacing:-.02em}.card p{margin:0;color:var(--muted);font-size:.96rem}.section-heading{margin:34px 0 12px}.section-heading h2{font-size:clamp(1.65rem,3vw,2.4rem);letter-spacing:-.045em;margin:0}.section-heading p{color:var(--muted);max-width:760px}.article{background:linear-gradient(180deg,rgba(17,24,45,.82),rgba(13,18,36,.82));border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,4vw,48px);box-shadow:var(--shadow);margin:14px 0 28px}.article h1{font-size:clamp(2rem,4.6vw,3.7rem);line-height:1;letter-spacing:-.055em;margin:0 0 18px}.article h2{font-size:1.55rem;letter-spacing:-.025em;margin-top:42px;border-top:1px solid var(--line);padding-top:28px}.article h3{margin-top:28px}.article p,.article li{color:#dbe2f6}.article p:first-of-type{font-size:1.12rem;color:var(--muted)}.article ul{padding-left:1.35rem}.article code{background:rgba(125,211,252,.12);border:1px solid rgba(125,211,252,.18);border-radius:7px;padding:.1rem .35rem}.article pre{overflow:auto;background:#060a14;border:1px solid var(--line);border-radius:16px;padding:16px;color:#e9f1ff}.article blockquote{border-left:4px solid var(--accent);margin-left:0;padding-left:18px;color:var(--muted)}.article table{width:100%;border-collapse:collapse;display:block;overflow:auto}.article th,.article td{border:1px solid var(--line);padding:10px;text-align:left}.notice{border:1px solid rgba(252,211,77,.28);background:rgba(252,211,77,.08);border-radius:18px;padding:16px;margin:18px 0}.footer{max-width:var(--max);margin:0 auto;padding:26px clamp(18px,4vw,44px) 52px;color:var(--muted);border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;align-items:center;flex-wrap:wrap}.footer a{color:#dff7ff}.mastodon-chip{display:inline-flex;gap:9px;align-items:center;text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:9px 13px;background:rgba(255,255,255,.06);font-weight:800}.mastodon-icon{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#6364ff,#8b5cf6);color:white;font-weight:950}.article.gentle pre{background:transparent;border:0;padding:0;color:#dbe2f6;white-space:pre-wrap}.article.gentle code{background:transparent;border:0;padding:0}.lang-choice{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:760px;margin:36px auto}
@media (max-width:1060px){.card-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}.shell{grid-template-columns:260px minmax(0,1fr)}}@media (max-width:900px){.shell{grid-template-columns:1fr}.sidebar{position:static;display:none}.sidebar.open{display:block}.menu-toggle{display:inline-flex}.top-nav{display:none}.card-grid{grid-template-columns:1fr 1fr}.hero{padding:42px 22px}}@media (max-width:640px){.card-grid,.card-grid.four,.card-grid.two,.lang-choice{grid-template-columns:1fr}.article{padding:22px}.hero h1{font-size:2.8rem}.footer{display:block}}

/* v4 cleanup: topic cards stay calm and text-first */
.card .icon{display:none}
.card h3{margin-top:0}
.article.gentle pre{font-family:inherit;font-size:1rem;line-height:1.75;background:transparent!important;border:0!important;padding:0!important;color:#dbe2f6;white-space:pre-wrap}
.article.gentle code{font-family:inherit}
.later-section{margin-top:34px;padding-top:20px;border-top:1px solid var(--line)}
.later-section .card{min-height:130px}

/* v7: cleaner retro color signature without using the image as a repeated background */
:root{
  --retro-red:#ef4444;
  --retro-orange:#f97316;
  --retro-yellow:#facc15;
  --retro-teal:#14b8a6;
  --retro-dark:#052e35;
}
.hero{
  background:
    radial-gradient(circle at 88% 12%, rgba(239,68,68,.13), transparent 18rem),
    radial-gradient(circle at 72% 36%, rgba(20,184,166,.12), transparent 22rem),
    linear-gradient(135deg,rgba(17,24,45,.88),rgba(22,33,60,.70));
}
.hero:before{
  height:180px;
  background:linear-gradient(90deg,var(--retro-red),var(--retro-orange),var(--retro-yellow),var(--retro-teal),var(--retro-dark));
  filter:blur(40px);
  opacity:.20;
}
.hero::after{
  content:"";
  position:absolute;
  right:28px;
  top:28px;
  width:min(220px,34vw);
  height:8px;
  border-radius:999px;
  background:linear-gradient(90deg,var(--retro-red),var(--retro-orange),var(--retro-yellow),var(--retro-teal),var(--retro-dark));
  opacity:.75;
}
.section-strip::before,
.article h1::after{
  content:"";
  display:block;
  width:96px;
  height:4px;
  border-radius:999px;
  margin:14px auto 0;
  background:linear-gradient(90deg,var(--retro-red),var(--retro-orange),var(--retro-yellow),var(--retro-teal),var(--retro-dark));
}
.article h1::after{margin:18px 0 0;width:120px;}
.brand-mark{
  background:linear-gradient(135deg,var(--retro-red),var(--retro-orange),var(--retro-yellow),var(--retro-teal),var(--retro-dark));
  color:#07111f;
}
.mastodon-icon{background:linear-gradient(135deg,#6364ff,#8b5cf6);}
@media (max-width:640px){.hero::after{right:22px;top:22px;width:120px;height:6px;opacity:.65}}


/* v8: clean dark background, no image/wallpaper feel, no top-left logo mark */
body{
  background:var(--bg)!important;
}
.brand{
  gap:0;
}
.brand-mark{
  display:none!important;
}
.hero{
  background:linear-gradient(135deg,rgba(17,24,45,.94),rgba(22,33,60,.78))!important;
}
.hero:before,
.hero::after{
  display:none!important;
}
.content::before,
.content::after,
.article::before,
.article::after{
  background-image:none!important;
}


/* v9: cleaner Mastodon profile link in footer */
.mastodon-chip{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.55rem .8rem;
  border:1px solid rgba(148,163,184,.24);
  border-radius:999px;
  background:rgba(15,23,42,.56);
  color:#f8fafc;
  text-decoration:none;
  font-weight:700;
  letter-spacing:.01em;
  box-shadow:0 10px 30px rgba(0,0,0,.16);
  transition:transform .18s ease, border-color .18s ease, background .18s ease;
}
.mastodon-chip:hover{
  transform:translateY(-1px);
  border-color:rgba(99,100,255,.72);
  background:rgba(30,41,59,.72);
}
.mastodon-logo{
  width:1.25rem;
  height:1.35rem;
  color:#6364ff;
  flex:0 0 auto;
  filter:drop-shadow(0 4px 10px rgba(99,100,255,.35));
}
.mastodon-icon{display:none!important;}


/* v11: beginner journey / lessons */
.lesson-path{
  display:grid;
  gap:14px;
  margin:24px 0 10px;
}
.lesson-row{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  gap:16px;
  align-items:center;
  padding:16px 18px;
  border:1px solid var(--line);
  border-radius:18px;
  background:rgba(255,255,255,.045);
  text-decoration:none;
}
.lesson-row:hover{
  transform:translateY(-2px);
  border-color:rgba(125,211,252,.45);
  background:rgba(255,255,255,.065);
}
.lesson-number{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  border-radius:999px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  color:#07111f;
  font-weight:950;
}
.lesson-row h3{margin:0 0 3px;font-size:1.05rem;letter-spacing:-.02em;}
.lesson-row p{margin:0;color:var(--muted);font-size:.95rem;}
.lesson-status{
  color:var(--muted);
  font-size:.86rem;
  font-weight:800;
  white-space:nowrap;
}
.lesson-status.ready{color:#bbf7d0;}
.lesson-progress{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:18px 0 8px;
}
.lesson-progress span{
  border:1px solid var(--line);
  background:rgba(255,255,255,.045);
  color:var(--muted);
  border-radius:999px;
  padding:6px 10px;
  font-size:.86rem;
  font-weight:800;
}
.lesson-progress .done{
  background:rgba(134,239,172,.12);
  border-color:rgba(134,239,172,.30);
  color:#bbf7d0;
}
.next-card{
  margin-top:34px;
  padding:20px;
  border:1px solid rgba(125,211,252,.25);
  border-radius:22px;
  background:linear-gradient(90deg,rgba(125,211,252,.10),rgba(196,181,253,.08));
}
.next-card p{margin-top:0;}
@media (max-width:640px){
  .lesson-row{grid-template-columns:auto minmax(0,1fr);}
  .lesson-status{grid-column:2;}
}

/* v13: make desktop sidebar independently scrollable */
@media (min-width:901px){
  .sidebar{
    max-height:calc(100vh - 104px);
    overflow-y:auto;
    overscroll-behavior:contain;
    scrollbar-width:thin;
    scrollbar-color:rgba(184,194,223,.45) transparent;
  }
  .sidebar::-webkit-scrollbar{width:8px;}
  .sidebar::-webkit-scrollbar-track{background:transparent;}
  .sidebar::-webkit-scrollbar-thumb{
    background:rgba(184,194,223,.35);
    border-radius:999px;
  }
  .sidebar::-webkit-scrollbar-thumb:hover{background:rgba(184,194,223,.55);}
}


/* v15: subtle support link */
.support-chip{
  display:inline-flex;
  gap:8px;
  align-items:center;
  text-decoration:none;
  border:1px solid rgba(252,211,77,.22);
  border-radius:999px;
  padding:9px 13px;
  background:rgba(252,211,77,.07);
  color:#fff7d6 !important;
  font-weight:800;
}
.support-chip:hover{
  border-color:rgba(252,211,77,.42);
  background:rgba(252,211,77,.12);
}
@media (max-width:640px){
  .support-chip,.mastodon-chip{margin-top:10px;}
}

/* v17: cleaner support placement */
.footer{
  justify-content:center;
  text-align:center;
}
.action-row{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin:24px 0;
}
.top-nav a.active{
  color:var(--text);
  background:rgba(255,255,255,.08);
}


/* v18: browser-saved passwords guide */
.card-grid.five{grid-template-columns:repeat(5,minmax(0,1fr));}
.compact-card{min-height:118px;}
.browser-choice-grid .card{scroll-margin-top:110px;}
.danger-notice{border-color:rgba(248,113,113,.36);background:rgba(248,113,113,.09);}
.article h2[id]{scroll-margin-top:100px;}
@media (max-width:1180px){.card-grid.five{grid-template-columns:repeat(3,minmax(0,1fr));}}
@media (max-width:760px){.card-grid.five{grid-template-columns:1fr;}}