/* Flutter Course website · shared styles (home + lecture pages) */
:root{
  --bg:#F5F7FB; --card:#FFFFFF; --ink:#0E1A2B; --muted:#4B5B73; --faint:#8592A6; --line:#E1E7F0; --line2:#C6D2E1;
  --navy:#0B2545; --blue:#02569B; --dart:#0175C2; --sky:#13B9FD; --tint:#EAF4FD; --warm:#F59E0B;
  --grad:linear-gradient(135deg,#13B9FD 0%,#0175C2 55%,#02569B 100%);
  --gtext:linear-gradient(110deg,#0796E0 0%,#13B9FD 30%,#02569B 60%,#0796E0 100%);
  --shadow:0 1px 2px rgba(15,35,70,.05),0 10px 30px rgba(15,35,70,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --head:"Sora",var(--font);
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (min-width:960px) and (min-height:640px){html{scroll-snap-type:y proximity}}
body{background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--dart)}
code{font:500 .9em var(--mono);background:var(--tint);color:var(--blue);padding:.1em .4em;border-radius:6px}
.wrap{width:min(1180px,100% - 40px);margin:0 auto}

/* ---------- chrome ---------- */
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--grad);z-index:50;transition:width .15s linear}
.topbar{position:fixed;top:0;left:0;right:0;z-index:40;display:flex;align-items:center;justify-content:space-between;padding:16px 28px;pointer-events:none}
.brand{pointer-events:auto;display:flex;align-items:center;gap:10px;font:700 16px var(--head);color:var(--ink);text-decoration:none;padding:8px 14px 8px 10px;border-radius:999px;background:rgba(255,255,255,.75);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);box-shadow:var(--shadow)}
.brand svg{width:18px;height:23px}
.counter{pointer-events:auto;font:600 13px var(--mono);color:var(--muted);padding:8px 14px;border-radius:999px;background:rgba(255,255,255,.75);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line)}
.dots{position:fixed;right:22px;top:50%;transform:translateY(-50%);z-index:40;display:grid;gap:10px}
.dots a{position:relative;display:block;width:10px;height:10px;border-radius:50%;background:var(--line2);transition:transform .3s var(--ease),background .3s}
.dots a:hover{transform:scale(1.4)}
.dots a.on{background:var(--dart);transform:scale(1.35);box-shadow:0 0 0 4px rgba(19,185,253,.2)}
.dots a span{position:absolute;right:20px;top:50%;transform:translate(6px,-50%);opacity:0;pointer-events:none;white-space:nowrap;font:600 12px var(--font);color:#fff;background:var(--navy);padding:4px 9px;border-radius:6px;transition:.2s}
.dots a:hover span{opacity:1;transform:translate(0,-50%)}
.keyhint{position:fixed;left:28px;bottom:20px;z-index:40;font:500 12.5px var(--font);color:var(--faint);display:flex;gap:6px;align-items:center}
.keyhint kbd{font:600 11px var(--mono);padding:2px 6px;border-radius:5px;background:#fff;border:1px solid var(--line2);border-bottom-width:2px;color:var(--ink)}

/* ---------- slides ---------- */
.slide{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;padding:96px 0 72px;scroll-snap-align:start;isolation:isolate;overflow:hidden}
.slide::before{content:"";position:absolute;inset:0;z-index:-2;background:
  radial-gradient(40vw 40vw at var(--ax,8%) var(--ay,10%),rgba(19,185,253,.14),transparent 70%),
  radial-gradient(45vw 45vw at var(--bx,95%) var(--by,95%),rgba(2,86,155,.08),transparent 70%)}
.slide::after{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(rgba(2,86,155,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(2,86,155,.05) 1px,transparent 1px);background-size:48px 48px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 45%,#000 20%,transparent 72%);mask-image:radial-gradient(ellipse at 50% 45%,#000 20%,transparent 72%)}
.slide:nth-of-type(3n+2){--ax:90%;--ay:8%;--bx:6%;--by:92%}
.slide:nth-of-type(3n){--ax:50%;--ay:-8%;--bx:96%;--by:60%}
.kicker{display:flex;align-items:center;gap:12px;font:700 13px var(--font);letter-spacing:.16em;text-transform:uppercase;color:var(--dart);margin-bottom:14px}
.kicker::before{content:"";width:38px;height:3px;border-radius:3px;background:var(--grad)}
.title{font:800 clamp(30px,4.4vw,54px)/1.08 var(--head);letter-spacing:-.025em}
.lead{font-size:clamp(16px,1.6vw,20px);color:var(--muted);margin-top:14px;max-width:640px}
.gt{background:var(--gtext);background-size:220% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:shine 6s linear infinite}
@keyframes shine{to{background-position:-220% 0}}

/* reveal */
.r{opacity:0;transform:translateY(26px);transition:opacity .8s var(--ease),transform .8s var(--ease);transition-delay:calc(var(--i,0) * 90ms)}
.r.l{transform:translateX(-36px)} .r.rt{transform:translateX(36px)} .r.z{transform:scale(.92)}
.in .r{opacity:1;transform:none}

/* buttons, chips, cards */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 20px;border-radius:14px;font-weight:600;font-size:15.5px;text-decoration:none;transition:transform .2s var(--ease),box-shadow .2s,filter .2s}
.btn svg{width:18px;height:18px}
.btn-p{background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(1,117,194,.28)}
.btn-p:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(1,117,194,.36)}
.btn-g{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-g:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:600 13px var(--mono);color:var(--blue);background:#fff;border:1px solid #CFE6F8;padding:5px 11px;border-radius:999px}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.lift{transition:transform .3s var(--ease),box-shadow .3s,border-color .3s}
.lift:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(15,35,70,.12);border-color:#BFE3F8}

/* ---------- 1 · title ---------- */
.hero .wrap{display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:center}
.hero h1{font:800 clamp(42px,7vw,88px)/1.02 var(--head);letter-spacing:-.035em}
.person{display:flex;align-items:center;gap:14px;margin-top:28px}
.avatar{display:grid;place-items:center;width:52px;height:52px;border-radius:16px;background:var(--grad);color:#fff;font:800 18px var(--head);box-shadow:0 8px 20px rgba(1,117,194,.3)}
.person b{display:block;font:700 19px var(--head)}
.person span{color:var(--muted);font-size:14.5px}
.links{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.stats{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.stat{padding:14px 20px;min-width:118px}
.stat b{display:block;font:800 34px/1.1 var(--head);background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:13.5px;color:var(--muted);font-weight:500}
.logo-stage{position:relative;justify-self:center;width:min(340px,80%);aspect-ratio:1}
.logo-stage .glow{position:absolute;inset:8%;border-radius:50%;background:radial-gradient(circle,rgba(19,185,253,.45),transparent 65%);filter:blur(18px);animation:pulse 5s ease-in-out infinite}
.logo-stage svg.big{position:absolute;inset:14% 22%;width:56%;height:72%;filter:drop-shadow(0 24px 40px rgba(2,86,155,.35));animation:float 7s ease-in-out infinite}
.orbit{position:absolute;inset:0;border-radius:50%;border:1.5px dashed #BFDDF3;animation:spin 40s linear infinite}
.orbit i{position:absolute;top:-7px;left:50%;width:14px;height:14px;border-radius:50%;background:var(--sky);box-shadow:0 0 0 5px rgba(19,185,253,.2)}
.orbit.o2{inset:13%;animation-duration:26s;animation-direction:reverse;border-color:#D6E8F7}
.orbit.o2 i{background:var(--warm);box-shadow:0 0 0 5px rgba(245,158,11,.2)}
@keyframes float{50%{transform:translateY(-14px) rotate(-3deg)}}
@keyframes pulse{50%{transform:scale(1.08);opacity:.75}}
@keyframes spin{to{transform:rotate(360deg)}}
.scroll-cue{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);display:grid;justify-items:center;gap:6px;font:600 12px var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.scroll-cue i{width:22px;height:34px;border:2px solid var(--line2);border-radius:12px;position:relative}
.scroll-cue i::after{content:"";position:absolute;left:50%;top:6px;width:4px;height:8px;margin-left:-2px;border-radius:2px;background:var(--dart);animation:wheel 1.8s ease-in-out infinite}
@keyframes wheel{0%{opacity:0;transform:translateY(-3px)}40%{opacity:1}100%{opacity:0;transform:translateY(10px)}}

/* ---------- 2 · map ---------- */
.map{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px}
.tile{display:grid;gap:10px;padding:20px;text-decoration:none;color:var(--ink)}
.tile .n{font:800 15px var(--mono);color:var(--dart)}
.tile h3{font:700 17px/1.3 var(--head)}
.tile p{font-size:13.5px;color:var(--muted)}
.tile .go{font:600 13px var(--font);color:var(--dart);display:flex;gap:6px;align-items:center}
.tile .go svg{width:14px;height:14px;transition:transform .25s var(--ease)}
.tile:hover .go svg{transform:translateX(4px)}

/* ---------- lecture slides ---------- */
.lec .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.bignum{position:absolute;right:-1vw;top:50%;transform:translateY(-50%);z-index:-1;font:800 min(42vw,520px)/1 var(--head);letter-spacing:-.06em;color:transparent;-webkit-text-stroke:2px rgba(2,86,155,.07);pointer-events:none;user-select:none}
.lec .chips{margin-top:22px}
.lec .actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:28px}
.lec .url{font:500 13px var(--mono);color:var(--faint);margin-top:12px;word-break:break-all}
.watch{padding:22px}
.watch h4{display:flex;align-items:center;gap:10px;font:700 13px var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.watch h4 svg{width:22px;height:22px;color:#FF0000}
.vid{display:grid;grid-template-columns:150px 1fr;gap:16px;align-items:center;padding:10px;border-radius:14px;text-decoration:none;color:var(--ink);transition:background .25s}
.vid+.vid{margin-top:6px}
.vid:hover{background:var(--bg)}
.thumb{position:relative;width:150px;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:#dfe6ef}
.thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.vid:hover .thumb img{transform:scale(1.06)}
.thumb::after{content:"";position:absolute;inset:0;background:rgba(14,26,43,.0);transition:background .25s}
.vid:hover .thumb::after{background:rgba(14,26,43,.15)}
.thumb .play{position:absolute;left:50%;top:50%;width:38px;height:38px;margin:-19px 0 0 -19px;border-radius:50%;background:rgba(255,255,255,.92);display:grid;place-items:center;z-index:1;transform:scale(.85);opacity:0;transition:.25s var(--ease)}
.vid:hover .thumb .play{opacity:1;transform:scale(1)}
.thumb .play svg{width:14px;height:14px;color:#FF0000;margin-left:2px}
.thumb em{position:absolute;right:6px;bottom:6px;z-index:1;font:600 11.5px var(--mono);font-style:normal;color:#fff;background:rgba(0,0,0,.78);padding:1px 6px;border-radius:4px}
.vid b{display:block;font-weight:600;font-size:15px;line-height:1.35}
.vid small{color:var(--faint);font-size:13px}

/* ---------- grades ---------- */
.bar{display:flex;height:64px;border-radius:16px;overflow:hidden;box-shadow:var(--shadow);margin-top:36px;background:#fff}
.bar div{display:grid;place-items:center;color:#fff;font:800 16px var(--head);flex:0 0 0%;transition:flex-basis 1.2s var(--ease);transition-delay:calc(var(--i) * 120ms);white-space:nowrap;overflow:hidden}
.in .bar div{flex-basis:var(--w)}
.legend{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}
.lg{display:flex;align-items:center;gap:14px;padding:16px 18px}
.lg i{width:14px;height:14px;border-radius:4px;flex:none}
.lg span{font-weight:600}
.lg small{display:block;color:var(--faint);font-weight:400;font-size:13px}
.lg b{margin-left:auto;font:800 26px var(--head)}

/* ---------- projects ---------- */
.proj .wrap{display:grid;grid-template-columns:.62fr 1.38fr;gap:48px;align-items:center}
.phone-wrap{position:relative;justify-self:center}
.phone-wrap::before{content:"";position:absolute;inset:10% -8%;border-radius:40px;background:radial-gradient(circle,rgba(19,185,253,.3),transparent 70%);filter:blur(22px);z-index:-1}
.phone-wrap img{width:min(280px,60vw);height:auto;animation:float 8s ease-in-out infinite}
.tagline{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.tag{font:700 12.5px var(--font);letter-spacing:.06em;padding:6px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--muted)}
.tag.m{background:var(--navy);border-color:var(--navy);color:#fff}
.checks{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px 22px;margin-top:22px}
.checks li{display:grid;grid-template-columns:24px 1fr;gap:10px;font-size:15px;line-height:1.45}
.checks li::before{content:"";width:20px;height:20px;margin-top:1px;border-radius:6px;background:var(--tint) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230175C2' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>") center/13px no-repeat;border:1px solid #CFE6F8}
.proj .more{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px;align-items:flex-start}
details.rubric{flex:1 1 320px;padding:14px 18px}
details.rubric summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between}
details.rubric summary::-webkit-details-marker{display:none}
details.rubric summary::after{content:"+";font:700 20px/1 var(--head);color:var(--dart);transition:transform .25s}
details.rubric[open] summary::after{transform:rotate(45deg)}
table{width:100%;border-collapse:collapse;margin-top:10px;font-size:14.5px}
td{padding:8px 4px;border-top:1px solid var(--line)}
td:last-child{text-align:right;font-weight:700;width:56px}
tr.t td{font-weight:800;color:var(--blue)}
.impress{flex:1 1 260px;display:flex;gap:10px;padding:14px 16px;border-radius:16px;background:#FFF7E6;border:1px solid #FDE2A7;font-size:14.5px}
.soon-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px}
.soon{padding:26px 22px;display:grid;gap:8px;border-style:dashed;border-color:var(--line2)}
.soon .k2{font:700 12px var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.soon b{font:700 20px var(--head)}
.soon .mk{font:800 44px/1 var(--head);background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.soon small{color:var(--faint)}
.lock{display:inline-flex;align-items:center;gap:6px;font:600 12.5px var(--font);color:var(--muted);background:var(--bg);padding:5px 10px;border-radius:999px;justify-self:start}
.lock svg{width:13px;height:13px}

/* ---------- submit + end ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px;counter-reset:s}
.step{padding:24px}
.step::before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--grad);color:#fff;font:800 17px var(--head);margin-bottom:14px;box-shadow:0 8px 18px rgba(1,117,194,.3)}
.step h3{font:700 18px var(--head);margin-bottom:8px}
.step p,.step li{color:var(--muted);font-size:15px}
.step ol{padding-left:18px;display:grid;gap:4px}
pre{background:#0F172A;color:#E2E8F0;border-radius:12px;padding:14px 16px;font:500 13px/1.75 var(--mono);overflow-x:auto;margin-top:10px}
pre .p{color:#13B9FD}
.end .wrap{text-align:center;display:grid;justify-items:center}
.end h2{font:800 clamp(44px,8vw,104px)/1 var(--head);letter-spacing:-.04em}
.res{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px;width:100%;text-align:left}
.res a{padding:22px;text-decoration:none;color:var(--ink);display:grid;gap:6px}
.res b{font:700 17px var(--head)}
.res span{color:var(--muted);font-size:14.5px}
.foot{margin-top:46px;color:var(--faint);font-size:14px}

@media (max-width:960px){
  .dots,.keyhint{display:none}
  .slide{min-height:auto;padding:110px 0 70px}
  .hero{min-height:100svh}
  .hero .wrap,.lec .wrap,.proj .wrap{grid-template-columns:1fr;gap:34px}
  .logo-stage{width:min(240px,62%)}
  .map{grid-template-columns:1fr 1fr}
  .legend,.steps,.res{grid-template-columns:1fr}
  .soon-grid{grid-template-columns:1fr 1fr}
  .checks{grid-template-columns:1fr}
  .bignum{top:120px;transform:none;font-size:56vw}
}
@media (max-width:540px){
  .map,.soon-grid{grid-template-columns:1fr}
  .vid{grid-template-columns:116px 1fr}
  .thumb{width:116px}
  .bar div{font-size:12px}
  .topbar{padding:12px 14px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .r{opacity:1;transform:none}
  .bar div{flex-basis:var(--w)}
  html{scroll-behavior:auto}
}

/* =========================================================
   Lecture detail page
   ========================================================= */
.lp-hero{position:relative;padding:130px 0 70px;overflow:hidden;isolation:isolate}
.lp-hero::before{content:"";position:absolute;inset:0;z-index:-2;background:radial-gradient(45vw 45vw at 85% 10%,rgba(19,185,253,.18),transparent 70%),radial-gradient(40vw 40vw at 5% 100%,rgba(2,86,155,.08),transparent 70%)}
.lp-hero::after{content:"";position:absolute;inset:0;z-index:-1;background-image:linear-gradient(rgba(2,86,155,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(2,86,155,.05) 1px,transparent 1px);background-size:48px 48px;-webkit-mask-image:radial-gradient(ellipse at 50% 40%,#000 20%,transparent 75%);mask-image:radial-gradient(ellipse at 50% 40%,#000 20%,transparent 75%)}
.lp-hero .bignum{top:56%}
.crumbs{display:flex;gap:8px;align-items:center;font:600 13.5px var(--font);color:var(--faint);margin-bottom:22px}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--dart)}
.lp-hero h1{font:800 clamp(34px,5.4vw,66px)/1.05 var(--head);letter-spacing:-.03em}
.lp-hero .lead{max-width:720px}
.lp-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.meta-pill{display:inline-flex;align-items:center;gap:8px;font:600 13.5px var(--font);color:var(--muted);background:#fff;border:1px solid var(--line);padding:7px 13px;border-radius:999px}
.meta-pill svg{width:15px;height:15px;color:var(--dart)}
.lp-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

.lp-body{display:grid;grid-template-columns:230px 1fr;gap:44px;align-items:start;padding-bottom:40px}
.toc{position:sticky;top:90px;display:grid;gap:2px}
.toc p{font:700 12px var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin:0 0 8px 12px}
.toc a{display:flex;align-items:center;gap:10px;padding:8px 12px;border-radius:10px;color:var(--muted);text-decoration:none;font-weight:500;font-size:14.5px;transition:background .2s,color .2s}
.toc a i{width:6px;height:6px;border-radius:50%;background:var(--line2);transition:.2s}
.toc a:hover{background:#fff;color:var(--ink)}
.toc a.on{background:#fff;color:var(--blue);box-shadow:var(--shadow)}
.toc a.on i{background:var(--sky);transform:scale(1.4)}

.blk{scroll-margin-top:90px;margin-bottom:28px;padding:30px}
.blk h2{display:flex;align-items:center;gap:12px;font:800 24px var(--head);letter-spacing:-.015em;margin-bottom:18px}
.blk h2 .ic{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--tint);color:var(--dart);flex:none}
.blk h2 .ic svg{width:20px;height:20px}
.blk > p{color:var(--muted);font-size:16.5px}

.goals{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:12px 24px}
.goals li{display:grid;grid-template-columns:26px 1fr;gap:10px;font-size:15.5px}
.goals li::before{content:"";width:22px;height:22px;border-radius:7px;background:var(--grad) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>") center/13px no-repeat}

.timeline{position:relative;display:grid;gap:14px;padding-left:34px}
.timeline::before{content:"";position:absolute;left:11px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--sky),var(--line))}
.tl{position:relative;padding:14px 18px;border-radius:14px;background:var(--bg);border:1px solid var(--line);transition:transform .25s var(--ease),border-color .25s}
.tl:hover{transform:translateX(4px);border-color:#BFE3F8}
.tl::before{content:attr(data-n);position:absolute;left:-34px;top:12px;width:24px;height:24px;border-radius:50%;background:#fff;border:2px solid var(--sky);display:grid;place-items:center;font:700 11px var(--mono);color:var(--dart)}
.tl b{display:block;font:700 16px var(--head)}
.tl span{color:var(--muted);font-size:15px}

.codeblk + .codeblk{margin-top:26px}
.codeblk h3{font:700 17px var(--head);margin-bottom:12px}
.codeview{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:start}
.editor{background:#0F172A;border-radius:14px;overflow:hidden;box-shadow:0 14px 34px rgba(15,23,42,.25)}
.editor-bar{display:flex;align-items:center;gap:7px;padding:10px 14px;background:rgba(255,255,255,.05);border-bottom:1px solid rgba(255,255,255,.06);font:500 12.5px var(--font);color:#8C9BB3}
.editor-bar i{width:10px;height:10px;border-radius:50%;background:#FF5F57}
.editor-bar i:nth-child(2){background:#FEBC2E}.editor-bar i:nth-child(3){background:#28C840}
.editor-bar span{margin-left:8px}
.editor-bar button{margin-left:auto;font:600 12px var(--font);color:#C9D4E3;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:7px;padding:4px 10px;cursor:pointer}
.editor-bar button:hover{background:rgba(255,255,255,.14)}
.editor pre{margin:0;border-radius:0;padding:12px 0;background:transparent;font:500 13.5px/1.7 var(--mono);color:#D6E2F0;counter-reset:ln;overflow-x:auto}
.editor .ln{display:block;padding:0 16px 0 52px;position:relative;transition:background .2s}
.editor .ln::before{counter-increment:ln;content:counter(ln);position:absolute;left:0;width:36px;text-align:right;color:#4B5A73}
.editor .ln.hl{background:rgba(19,185,253,.16);box-shadow:inset 3px 0 0 #13B9FD}
.tk-kw{color:#569CD6}.tk-type{color:#4EC9B0}.tk-fn{color:#DCDCAA}.tk-str{color:#CE9178}.tk-num{color:#B5CEA8}.tk-prop{color:#9CDCFE}.tk-ann{color:#D7BA7D}.tk-com{color:#6A9955}.tk-key{color:#569CD6}.tk-val{color:#CE9178}.tk-cmd{color:#13B9FD}
.notes{display:grid;gap:10px}
.note{display:grid;grid-template-columns:auto 1fr;gap:12px;padding:12px 14px;border-radius:12px;background:var(--bg);border:1px solid var(--line);cursor:default;transition:border-color .2s,background .2s,transform .2s var(--ease)}
.note:hover,.note.on{border-color:#9DD9F7;background:#fff;transform:translateX(3px)}
.note .lines{font:700 12px var(--mono);color:var(--dart);background:var(--tint);border-radius:7px;padding:4px 8px;height:fit-content;white-space:nowrap}
.note p{font-size:14.5px;line-height:1.5}

.vgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.vcard{display:grid;text-decoration:none;color:var(--ink);border-radius:16px;overflow:hidden;background:var(--bg);border:1px solid var(--line);transition:transform .3s var(--ease),box-shadow .3s}
.vcard:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(15,35,70,.12)}
.vcard .thumb{width:100%;border-radius:0}
.vcard .thumb .play{width:54px;height:54px;margin:-27px 0 0 -27px;opacity:1;transform:none}
.vcard .thumb .play svg{width:20px;height:20px}
.vcard .vb{padding:14px 16px 16px}
.vcard b{display:block;font:700 16px/1.35 var(--head)}
.vcard small{display:block;color:var(--faint);font-size:13px;margin:2px 0 6px}
.vcard p{color:var(--muted);font-size:14.5px;line-height:1.5}

.practice{list-style:none;display:grid;gap:10px;counter-reset:pr}
.practice li{counter-increment:pr;display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:center;padding:12px 14px;border-radius:12px;background:var(--bg);border:1px solid var(--line)}
.practice li::before{content:counter(pr);display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--grad);color:#fff;font:800 14px var(--head)}
.mtable{display:grid;gap:10px}
.mrow{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:14px 16px;border-radius:12px;background:var(--bg);border:1px solid var(--line)}
.mrow .err{font:600 13.5px var(--mono);color:#DC2626}
.mrow .fix{font-size:15px}
.slides-cta{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;background:var(--navy);color:#fff;border:none;overflow:hidden;position:relative}
.slides-cta::after{content:"";position:absolute;right:-60px;top:-80px;width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,rgba(19,185,253,.4),transparent 70%)}
.slides-cta h2{color:#fff;margin-bottom:6px}
.slides-cta p{color:#C9D8EE}
.slides-cta .btn{position:relative;z-index:1}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:10px 0 70px}
.pager a{padding:20px 22px;text-decoration:none;color:var(--ink);display:grid;gap:4px}
.pager a.next{text-align:right}
.pager small{font:700 12px var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.pager b{font:700 17px var(--head)}
.pager .empty{visibility:hidden}

@media (max-width:960px){
  .lp-body{grid-template-columns:1fr}
  .toc{display:none}
  .codeview,.vgrid,.goals,.mrow{grid-template-columns:1fr}
  .slides-cta{grid-template-columns:1fr}
  .blk{padding:22px}
}