@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@400;500;600;700;800&family=IBM+Plex+Sans+Thai:wght@400;500;600&family=JetBrains+Mono:wght@400;600&display=swap');
:root{
  --navy:#111A5E;--blue:#2D4FD6;--blue2:#4F6BFF;--sky:#7FD3FF;--gold:#F5B700;--gold2:#FFD54A;
  --ink:#1B2140;--muted:#667092;--line:#E6EAF5;--bg:#F6F8FD;--card:#fff;--ok:#16A34A;--bad:#DC2626;
  --r:18px;--sh:0 1px 2px rgba(17,26,94,.06),0 8px 24px rgba(17,26,94,.07);--sh2:0 12px 40px rgba(17,26,94,.14);
  --h:'Kanit',system-ui,sans-serif;--b:'IBM Plex Sans Thai','Kanit',system-ui,sans-serif;--mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--b);color:var(--ink);background:var(--bg);font-size:16.5px;line-height:1.75;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--h);line-height:1.3;margin:0 0 .4em;color:var(--navy);font-weight:600}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}.center{text-align:center}
[data-lucide]{width:18px;height:18px;stroke-width:2;vertical-align:-3px}
.sm[data-lucide]{width:14px;height:14px}

/* ---------- ปุ่ม ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;border:0;cursor:pointer;font:500 15px var(--h);padding:10px 18px;border-radius:12px;background:var(--blue);color:#fff;transition:.18s;text-decoration:none!important;white-space:nowrap}
.btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(45,79,214,.3)}
.btn.gold{background:linear-gradient(180deg,var(--gold2),var(--gold));color:#2A1E00}
.btn.gold:hover{box-shadow:0 6px 18px rgba(245,183,0,.4)}
.btn.ghost{background:#fff;color:var(--blue);box-shadow:inset 0 0 0 1.5px #C9D3F5}
.btn.sm{padding:7px 13px;font-size:14px;border-radius:10px}
.btn.lg{padding:14px 26px;font-size:17px;border-radius:14px}
.btn.block{width:100%;justify-content:center}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:12px}.row-center{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:16px}

/* ---------- แถบบน ---------- */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:18px;padding:10px max(20px,calc((100vw - 1160px)/2));background:rgba(255,255,255,.82);backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--navy);text-decoration:none!important}
.brand b{font-family:var(--h);font-size:18px;display:block;line-height:1.1}.brand small{color:var(--muted);font-size:12px}
.logo{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:linear-gradient(135deg,var(--blue2),var(--navy));color:#fff;box-shadow:0 4px 12px rgba(45,79,214,.35)}
.mainnav{display:flex;gap:4px;margin-left:auto;align-items:center}
.mainnav>a,.dd-btn{display:flex;gap:7px;align-items:center;padding:8px 12px;border-radius:10px;color:var(--ink);font:500 15px var(--h);background:none;border:0;cursor:pointer;text-decoration:none!important}
.mainnav>a:hover,.dd-btn:hover,.mainnav>a.on{background:#EEF2FF;color:var(--blue)}
.dd{position:relative}
.dd-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);background:#fff;border-radius:14px;box-shadow:var(--sh2);border:1px solid var(--line);padding:8px;min-width:260px}
.dd.open .dd-menu{display:block;animation:pop .18s}
.dd-menu a{display:flex;gap:10px;align-items:center;padding:9px 12px;border-radius:9px;color:var(--ink);font-size:15px;text-decoration:none!important}
.dd-menu a:hover{background:#F1F4FF;color:var(--blue)}
.me{display:flex;align-items:center;gap:10px}
.streak{font:600 14px var(--h);display:flex;gap:2px;align-items:center;color:#C2410C}
.xpchip{display:flex;align-items:center;gap:7px;padding:5px 10px 5px 6px;border-radius:99px;background:#F3F5FF;color:var(--navy);text-decoration:none!important;font-family:var(--h)}
.xpchip .lv{font-size:18px}.xpchip b{font-size:14px}.xpchip small{font-size:11px;color:var(--muted)}
.xpbar{width:54px;height:6px;border-radius:9px;background:#DCE2F8;overflow:hidden}.xpbar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold2),var(--gold))}
.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#FFF4CC,#FFE08A);font-size:20px;text-decoration:none!important;box-shadow:0 0 0 2px #fff,0 0 0 4px #FFD54A}
.burger{display:none;margin-left:auto;background:none;border:0;padding:8px;cursor:pointer}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;background:radial-gradient(1200px 500px at 85% -10%,#4F6BFF 0%,transparent 60%),radial-gradient(800px 400px at 0% 120%,#7FD3FF33,transparent 60%),linear-gradient(135deg,#0E1650,#1D2C9E 55%,#2D4FD6)}
.hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.12) 1px,transparent 1px);background-size:22px 22px;mask-image:linear-gradient(180deg,#000,transparent 85%)}
.hero-in{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding:64px 20px 72px}
.eyebrow{display:inline-flex;gap:8px;align-items:center;padding:6px 14px;border-radius:99px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);font:500 14px var(--h)}
.hero h1{color:#fff;font-size:clamp(34px,5vw,56px);font-weight:700;margin:18px 0 10px;letter-spacing:-.5px}
.hero h1 span{background:linear-gradient(90deg,var(--gold2),#FFB020);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:18px;color:#D9E1FF;max-width:560px}
.hero .row{margin-top:26px}
.hero .btn.ghost{background:rgba(255,255,255,.1);color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.35)}
.hero-stats{display:flex;gap:28px;margin-top:34px}.hero-stats b{display:block;font:700 28px var(--h);color:#fff}.hero-stats span{font-size:14px;color:#B9C5FF}
.hero-art{position:relative;height:360px}
.float{position:absolute;border-radius:22px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);backdrop-filter:blur(8px);box-shadow:0 20px 50px rgba(0,0,20,.35);animation:bob 6s ease-in-out infinite}
.f-code{left:0;top:30px;width:300px;padding:18px 20px;font:14px/1.7 var(--mono);color:#E6EBFF}
.f-code .k{color:var(--gold2)}.f-code .s{color:#9BE7A8}.f-code .c{color:#93A3D9}
.f-badge{right:10px;top:0;padding:14px 16px;display:flex;gap:12px;align-items:center;animation-delay:-2s}
.f-badge .em{font-size:30px}.f-badge b{display:block;font:600 15px var(--h)}.f-badge small{color:#C9D3FF}
.f-prog{right:30px;bottom:20px;width:250px;padding:16px 18px;animation-delay:-4s}
.f-prog .bar{height:10px;border-radius:9px;background:rgba(255,255,255,.18);overflow:hidden;margin-top:8px}.f-prog .bar i{display:block;height:100%;width:68%;background:linear-gradient(90deg,var(--gold2),var(--gold));border-radius:9px}
.f-ic{left:40px;bottom:10px;width:64px;height:64px;display:grid;place-items:center;font-size:30px;animation-delay:-3s}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* ---------- Sections ---------- */
section.blk{padding:64px 0}
.sec-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:26px;flex-wrap:wrap}
.sec-head h2{font-size:30px;margin:0}.sec-head p{margin:4px 0 0;color:var(--muted)}
.kicker{font:600 13px var(--h);letter-spacing:1.5px;color:var(--blue);text-transform:uppercase}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);border:1px solid var(--line)}

/* Dashboard strip */
.mystrip{margin-top:-38px;position:relative;z-index:2}
.mystrip .card{display:grid;grid-template-columns:auto 1fr auto auto;gap:24px;align-items:center;padding:20px 26px}
.mystrip .big-lv{font-size:40px}
.mystrip h3{margin:0;font-size:20px}.mystrip .bar{height:10px;border-radius:9px;background:#EEF1FB;overflow:hidden;margin-top:8px}.mystrip .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue2),var(--blue));border-radius:9px;transition:width .6s}
.stat{text-align:center}.stat b{display:block;font:700 24px var(--h);color:var(--navy)}.stat span{font-size:13px;color:var(--muted)}

/* Feature tiles */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat{padding:22px}.feat h4{margin:12px 0 4px;font-size:18px}.feat p{margin:0;color:var(--muted);font-size:15px}
.tile{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--c1,#4F6BFF),var(--c2,#2D4FD6));box-shadow:0 6px 16px -4px var(--c2,#2D4FD6)}
.tile [data-lucide]{width:24px;height:24px}

/* Units */
.units{display:grid;gap:22px}
.unit{padding:0;overflow:hidden}
.unit-h{display:flex;gap:16px;align-items:center;padding:20px 24px;border-bottom:1px solid var(--line);background:linear-gradient(90deg,color-mix(in srgb,var(--uc) 8%,#fff),#fff 60%)}
.unit-h .tile{--c1:color-mix(in srgb,var(--uc) 70%,#fff);--c2:var(--uc)}
.unit-h h3{margin:0;font-size:20px}.unit-h small{color:var(--muted);font-family:var(--h)}
.unit-h .uprog{margin-left:auto;text-align:right;font:600 14px var(--h);color:var(--muted)}
.lessons{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;padding:18px 20px 22px}
.lcard{position:relative;display:flex;flex-direction:column;gap:10px;padding:16px;border-radius:14px;border:1px solid var(--line);background:#fff;color:var(--ink);text-decoration:none!important;transition:.2s}
.lcard:hover{transform:translateY(-3px);box-shadow:var(--sh2);border-color:#C9D3F5}
.lcard .top{display:flex;gap:12px;align-items:center}
.lcard .ico{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:color-mix(in srgb,var(--uc) 12%,#fff);color:var(--uc)}
.lcard .num{font:600 12px var(--h);color:var(--muted)}.lcard h4{font-size:16px;margin:0;color:var(--navy)}
.lcard .lp{height:6px;border-radius:9px;background:#EEF1FB;overflow:hidden}.lcard .lp i{display:block;height:100%;background:var(--uc)}
.lcard .meta{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}
.lcard.soon{opacity:.62}.lcard.soon:hover{transform:none;box-shadow:none}
.pill{display:inline-flex;align-items:center;gap:4px;font:500 12px var(--h);padding:2px 9px;border-radius:99px;background:#EEF2FF;color:var(--blue)}
.pill.done{background:#DCFCE7;color:var(--ok)}.pill.soon{background:#F1F5F9;color:#64748B}

/* Links grid */
.links{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.lnk{display:flex;gap:14px;align-items:center;padding:16px 18px;color:var(--ink);text-decoration:none!important;transition:.2s}
.lnk:hover{transform:translateY(-2px);box-shadow:var(--sh2)}.lnk b{font-family:var(--h);font-weight:600;display:block}.lnk small{color:var(--muted)}

/* ---------- Lesson page ---------- */
.lhero{background:linear-gradient(135deg,#0E1650,#1D2C9E 60%,var(--uc,#2D4FD6));color:#fff;padding:40px 0 70px;position:relative;overflow:hidden}
.lhero::after{content:"";position:absolute;right:-60px;top:-60px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.14),transparent 70%)}
.crumb{font-size:14px;color:#B9C5FF}.crumb a{color:#DDE4FF}
.lhero h1{color:#fff;font-size:clamp(28px,4vw,42px);margin:10px 0}
.lhero .tags{display:flex;gap:8px;flex-wrap:wrap}.lhero .tags span{padding:4px 12px;border-radius:99px;background:rgba(255,255,255,.12);font:500 13px var(--h)}
.lhero .big-ico{position:absolute;right:max(20px,calc((100vw - 1160px)/2));bottom:20px;width:120px;height:120px;border-radius:32px;display:grid;place-items:center;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);z-index:1}
.lhero .big-ico [data-lucide]{width:60px;height:60px;stroke-width:1.5}
.lgrid{display:grid;grid-template-columns:260px 1fr;gap:28px;margin-top:-40px;position:relative;z-index:2;padding-bottom:60px}
.toc{position:sticky;top:78px;align-self:start;padding:18px}
.toc h4{font-size:15px;margin-bottom:10px}
.toc .lp{height:8px;border-radius:9px;background:#EEF1FB;overflow:hidden;margin-bottom:6px}.toc .lp i{display:block;height:100%;background:linear-gradient(90deg,var(--gold2),var(--gold))}
.toc ol{list-style:none;padding:0;margin:12px 0 0;counter-reset:t}
.toc li a{display:flex;gap:10px;align-items:center;padding:7px 8px;border-radius:9px;color:var(--ink);font-size:14.5px;text-decoration:none!important}
.toc li a:hover{background:#F1F4FF}
.toc li a .ck{width:20px;height:20px;border-radius:50%;flex:none;display:grid;place-items:center;border:1.5px solid #CBD3EE;font-size:11px;color:#fff}
.toc li a.read .ck{background:var(--ok);border-color:var(--ok)}
.lmain{display:flex;flex-direction:column;gap:22px;min-width:0}
.lsec{padding:28px 30px;scroll-margin-top:80px}
.lsec>h2{display:flex;gap:12px;align-items:center;font-size:24px}
.lsec>h2 .tile{width:40px;height:40px;border-radius:12px}.lsec>h2 .tile [data-lucide]{width:20px;height:20px}
.lsec p,.lsec li{font-size:16.5px}
.lsec h3{font-size:19px;margin-top:22px}
.read-btn{margin-top:18px;display:flex;justify-content:flex-end}
.read-btn .btn.done{background:#DCFCE7;color:var(--ok);pointer-events:none}
.box{border-radius:14px;padding:16px 18px;margin:14px 0;background:#F5F7FF;border:1px solid #DFE5FB}
.box.tip{background:#FFFBEB;border-color:#FCE7A6}.box.warn{background:#FEF2F2;border-color:#FBD5D5}.box.ok{background:#F0FDF4;border-color:#BBF7D0}
.box b:first-child{font-family:var(--h)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.mini{padding:16px;border-radius:14px;border:1px solid var(--line);background:#fff}
.mini .em{font-size:28px}.mini h4{margin:6px 0 2px;font-size:17px}.mini p{margin:0;font-size:15px;color:var(--muted)}
table.t{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:15.5px;margin:12px 0}
table.t th{background:#EEF2FF;font-family:var(--h);font-weight:500;color:var(--navy);text-align:left}
table.t th,table.t td{padding:10px 14px;border-bottom:1px solid var(--line)}table.t tr:last-child td{border-bottom:0}
pre.code,code{font-family:var(--mono)}code{background:#EEF2FF;padding:1px 6px;border-radius:6px;font-size:.9em;color:#2B3AA8}
pre.code{background:#0F1640;color:#E6EBFF;padding:16px 18px;border-radius:12px;overflow:auto;font-size:14px;line-height:1.65}
.video{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#000}.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.res{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.res a{display:flex;gap:12px;align-items:center;padding:14px;border-radius:12px;border:1px solid var(--line);color:var(--ink);text-decoration:none!important;transition:.2s;background:#fff}
.res a:hover{border-color:#C9D3F5;box-shadow:var(--sh)}.res a b{font-family:var(--h);font-weight:500;display:block;font-size:15px}.res a small{color:var(--muted)}
.ind{display:flex;gap:12px;padding:12px 14px;border-radius:12px;background:#F5F7FF;margin:8px 0}.ind b{font-family:var(--h);white-space:nowrap;color:var(--blue)}
.lnav{display:flex;justify-content:space-between;gap:12px}

/* ---------- Widgets ---------- */
.widget{margin:18px 0;padding:20px;border-radius:16px;background:linear-gradient(180deg,#FAFBFF,#fff);border:1.5px solid #DFE5FB;position:relative;transition:.3s}
.widget.pop{box-shadow:0 0 0 4px rgba(245,183,0,.35)}
.w-head{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;margin-bottom:8px}
.w-head h4{width:100%;margin:4px 0 0;font-size:18px}.w-head p{width:100%;margin:0;color:var(--muted);font-size:15px}
.w-tag{display:inline-flex;gap:6px;align-items:center;font:600 12.5px var(--h);padding:4px 11px;border-radius:99px;background:linear-gradient(90deg,#4F6BFF,#2D4FD6);color:#fff}
.w-tag [data-lucide]{width:14px;height:14px}
.w-done{font:500 12.5px var(--h);color:var(--ok);background:#DCFCE7;padding:3px 10px;border-radius:99px}
.hint{font-size:14px;color:var(--muted);margin:4px 0 10px}
.good{color:var(--ok);margin:8px 0}.bad{color:var(--bad);margin:8px 0}.err{color:#FCA5A5}
.note{padding:12px 14px;border-left:4px solid var(--blue);background:#F5F7FF;border-radius:0 10px 10px 0;margin:10px 0}
.warn{color:#B45309;background:#FFFBEB;padding:8px 12px;border-radius:10px;font-size:14px}
/* quiz */
.q-text{font-weight:500;font-size:17px;margin:8px 0}
.q-opts{display:grid;gap:9px}.q-opts button{text-align:left;padding:12px 16px;border-radius:12px;border:1.5px solid var(--line);background:#fff;font:15.5px var(--b);cursor:pointer;transition:.15s;color:var(--ink)}
.q-opts button:hover:not(:disabled){border-color:var(--blue);background:#F5F7FF}
.q-opts button.ok{border-color:var(--ok);background:#F0FDF4}.q-opts button.no{border-color:var(--bad);background:#FEF2F2}
.q-prog{height:6px;background:#EEF1FB;border-radius:9px;overflow:hidden}.q-prog span{display:block;height:100%;background:var(--blue)}
.q-result{display:flex;gap:22px;align-items:center}
.ring{--p:0;width:110px;height:110px;border-radius:50%;flex:none;display:grid;place-items:center;background:conic-gradient(var(--gold) calc(var(--p)*1%),#EEF1FB 0)}
.ring b{width:84px;height:84px;border-radius:50%;background:#fff;display:grid;place-items:center;font:700 22px var(--h);color:var(--navy)}
/* sort */
.s-pool{display:flex;flex-wrap:wrap;gap:8px;min-height:48px;padding:10px;border-radius:12px;background:#F1F4FC;margin-bottom:12px}
.chip{padding:8px 13px;border-radius:10px;border:1.5px solid #D5DCF3;background:#fff;font:14.5px var(--b);cursor:grab;transition:.15s;color:var(--ink)}
.chip.sel{border-color:var(--blue);box-shadow:0 0 0 3px rgba(45,79,214,.18);transform:translateY(-2px)}
.chip.ok{border-color:var(--ok);background:#F0FDF4}.chip.no{border-color:var(--bad);background:#FEF2F2}
.s-buckets{display:grid;grid-template-columns:repeat(var(--n),1fr);gap:12px}
.s-bucket{border:2px dashed #C9D3F5;border-radius:14px;padding:10px;min-height:120px;cursor:pointer;transition:.15s}
.s-bucket:hover{border-color:var(--blue);background:#F8FAFF}
.s-bh{font:600 15px var(--h);color:var(--navy);margin-bottom:8px}.s-drop{display:flex;flex-wrap:wrap;gap:6px}
.s-msg,.o-msg,.m-msg,.tf-msg{font:500 15px var(--h)}
/* match */
.m-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:12px}.m-col{display:flex;flex-direction:column;gap:8px}
.m-l,.m-r{padding:11px 14px;border-radius:11px;border:1.5px solid var(--line);background:#fff;text-align:left;font:15px var(--b);cursor:pointer;color:var(--ink)}
.m-l{font-family:var(--h);font-weight:500}
.m-l.sel{border-color:var(--blue);background:#EEF2FF}.m-l.ok,.m-r.ok{border-color:var(--ok);background:#F0FDF4;color:#166534}
.shake{animation:shake .35s}@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
/* order */
.o-list{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.o-list li{display:flex;gap:12px;align-items:center;padding:10px 12px;border-radius:12px;border:1.5px solid var(--line);background:#fff;cursor:grab}
.o-list li.ok{border-color:var(--ok);background:#F0FDF4}.o-list li.no{border-color:#FCA5A5}
.o-n{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:#EEF2FF;font:600 14px var(--h);color:var(--blue);flex:none}
.o-t{flex:1}.o-btns button{border:0;background:#F1F4FC;border-radius:7px;width:30px;height:28px;cursor:pointer;margin-left:3px}
/* flip */
.f-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
.f-card{perspective:900px;border:0;background:none;padding:0;height:150px;cursor:pointer;font:inherit}
.f-in{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}
.f-card.flip .f-in{transform:rotateY(180deg)}
.f-front,.f-back{position:absolute;inset:0;backface-visibility:hidden;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:12px;text-align:center}
.f-front{background:linear-gradient(135deg,#4F6BFF,#1D2C9E);color:#fff;font:600 16px var(--h)}.f-ic{font-size:30px;margin-bottom:4px}
.f-back{background:#fff;border:1.5px solid #C9D3F5;transform:rotateY(180deg);font-size:14px;color:var(--ink);line-height:1.55}
/* tf */
.tf-row{display:grid;grid-template-columns:1fr auto;gap:6px 12px;padding:12px 0;border-bottom:1px solid var(--line);align-items:center}
.tf-b button{padding:6px 14px;border-radius:9px;border:1.5px solid var(--line);background:#fff;cursor:pointer;font:500 14px var(--h);margin-left:6px}
.tf-b button.ok{border-color:var(--ok);background:#F0FDF4}.tf-b button.no{border-color:var(--bad);background:#FEF2F2}
.tf-why{grid-column:1/-1;font-size:14px;color:var(--muted)}
/* survey */
.sv-list{display:grid;gap:8px;margin:8px 0 12px}.sv-row{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:11px;border:1.5px solid var(--line);background:#fff;cursor:pointer}
.sv-row input{width:18px;height:18px;margin-top:4px;accent-color:var(--blue)}
.meter{height:12px;background:#EEF1FB;border-radius:9px;overflow:hidden;margin:12px 0}.meter span{display:block;height:100%;width:0;transition:.4s;border-radius:9px}.meter.big{height:16px}
/* password */
.pw-in{display:flex;gap:8px;flex-wrap:wrap}.pw-in input{flex:1;min-width:200px;padding:12px 14px;border-radius:12px;border:1.5px solid #C9D3F5;font:17px var(--mono)}
.pw-rules{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:6px}
.pw-rules li{padding:6px 10px;border-radius:9px;background:#F5F7FF;font-size:14.5px}.pw-rules li::before{content:"○ ";color:#94A3B8}
.pw-rules li.ok{background:#F0FDF4;color:#166534}.pw-rules li.ok::before{content:"✓ ";color:var(--ok)}
/* spot */
.spot-card{padding:18px;border-radius:14px;background:#fff;border:1px solid #D5DCF3;box-shadow:var(--sh);line-height:2;font-size:15.5px}
.sp{cursor:pointer;border-radius:6px;padding:2px 3px;transition:.15s}.sp:hover{background:#FEF9C3}
.sp.blk{display:block}.sp.hit{background:#FEE2E2;outline:2px solid #F87171}.sp.miss{background:#E2E8F0}
/* cc */
.cc-q{margin:8px 0}.cc-q p{margin:0 0 4px;font-weight:500}.cc-q label{display:inline-flex;gap:6px;margin-right:16px;font-size:15px;cursor:pointer}
.cc-badge{display:flex;gap:6px;margin:12px 0 4px}.cc-badge span{padding:6px 12px;border-radius:9px;background:#111;color:#fff;font:700 14px var(--h)}
/* path */
.path{position:relative;display:flex;justify-content:space-between;gap:6px;padding:20px 4px 6px}
.path-line{position:absolute;left:30px;right:30px;top:46px;height:4px;background:repeating-linear-gradient(90deg,#C9D3F5 0 10px,transparent 10px 16px)}
.pkt{position:absolute;top:-16px;left:0;font-style:normal;font-size:24px;transform:translateX(-50%);transition:left .9s ease-in-out}
.node{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:4px;border:0;background:none;cursor:pointer;font:500 12.5px var(--h);color:var(--navy);width:70px}
.node span{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:#fff;border:2px solid #C9D3F5;font-size:24px;transition:.2s}
.node.on span{border-color:var(--gold);box-shadow:0 0 0 5px rgba(245,183,0,.25);transform:scale(1.08)}
/* reflect */
.rf{display:block;margin:10px 0;font-weight:500}.rf textarea,label input,label select{display:block;width:100%;margin-top:5px;padding:10px 12px;border-radius:11px;border:1.5px solid #D5DCF3;font:15px var(--b);resize:vertical}
/* python */
.task{padding:10px 14px;border-radius:11px;background:#FFFBEB;border:1px solid #FCE7A6;margin-bottom:10px;font-size:15.5px}
.py{border-radius:14px;overflow:hidden;background:#0F1640;box-shadow:var(--sh)}
.py-bar{display:flex;justify-content:space-between;align-items:center;padding:8px 10px 8px 16px;background:#0A1033;color:#93A3D9;font:13px var(--mono)}
.py-btns{display:flex;gap:6px;align-items:center}.py-reset{background:none;border:0;color:#93A3D9;cursor:pointer;padding:6px}
.py-code{width:100%;border:0;outline:0;background:#0F1640;color:#E6EBFF;font:14.5px/1.7 var(--mono);padding:14px 16px;resize:none;tab-size:4;display:block}
.py-out{background:#060A24;color:#C8F7D0;padding:12px 16px;min-height:52px;font:14px/1.6 var(--mono);border-top:1px solid #1E2A6B}.py-out pre{margin:0;white-space:pre-wrap}
.hintbox{margin-top:10px;font-size:15px}.hintbox summary{cursor:pointer;color:var(--blue);font-family:var(--h)}

/* ---------- Toast / modal / confetti ---------- */
#toasts{position:fixed;right:18px;bottom:18px;z-index:200;display:flex;flex-direction:column;gap:8px}
.toast{min-width:220px;padding:12px 16px;border-radius:14px;background:#0F1640;color:#fff;box-shadow:var(--sh2);animation:slidein .3s;display:flex;flex-direction:column}
.toast b{font-family:var(--h);font-weight:600}.toast span{font-size:13.5px;color:#B9C5FF}
.toast.xp{background:linear-gradient(135deg,#F5B700,#FF9500);color:#2A1E00}.toast.xp span{color:#5A3E00}
.toast.badge{background:linear-gradient(135deg,#7C3AED,#2D4FD6)}.toast.err{background:#B91C1C}
.toast.out{opacity:0;transform:translateX(30px);transition:.4s}
@keyframes slidein{from{opacity:0;transform:translateX(30px)}}
.confetti{position:fixed;inset:0;pointer-events:none;z-index:300}
.modal-bg{position:fixed;inset:0;z-index:150;background:rgba(10,16,51,.5);backdrop-filter:blur(4px);display:grid;place-items:center;padding:20px;animation:fade .2s}
.modal-bg.out{opacity:0;transition:.2s}
.modal{position:relative;background:#fff;border-radius:22px;padding:28px;max-width:460px;width:100%;box-shadow:var(--sh2);animation:pop .25s}
.modal label{display:block;margin:12px 0;font:500 14.5px var(--h)}
.modal-x{position:absolute;right:14px;top:12px;border:0;background:#F1F4FC;width:32px;height:32px;border-radius:50%;cursor:pointer}
.big-emoji{font-size:64px;line-height:1}
.avatars{display:grid;grid-template-columns:repeat(8,1fr);gap:6px;margin:12px 0 18px}.avatars button{font-size:24px;border:2px solid transparent;background:#F5F7FF;border-radius:12px;padding:6px 0;cursor:pointer}.avatars button.on{border-color:var(--gold);background:#FFFBEB}
@keyframes pop{from{opacity:0;transform:scale(.94) translateY(6px)}}@keyframes fade{from{opacity:0}}

/* ---------- Profile / leaderboard ---------- */
.pf-top{display:grid;grid-template-columns:auto 1fr;gap:24px;align-items:center;padding:26px}
.pf-av{width:96px;height:96px;border-radius:28px;display:grid;place-items:center;font-size:54px;background:linear-gradient(135deg,#FFF4CC,#FFE08A);box-shadow:0 0 0 4px #fff,0 0 0 7px var(--gold2)}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.bdg{padding:16px 12px;text-align:center;border-radius:16px;border:1px solid var(--line);background:#fff}
.bdg .em{font-size:38px;display:block}.bdg b{font-family:var(--h);font-weight:600;display:block;margin-top:4px}.bdg small{color:var(--muted);font-size:13px;line-height:1.4;display:block}
.bdg.lock{filter:grayscale(1);opacity:.45}
.board{width:100%;border-collapse:collapse}.board td,.board th{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}
.board th{font:500 14px var(--h);color:var(--muted)}.board tr.me td{background:#FFFBEB}
.rank{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font:700 15px var(--h);background:#F1F4FC}
.r1 .rank{background:linear-gradient(135deg,#FFE08A,#F5B700)}.r2 .rank{background:linear-gradient(135deg,#F1F5F9,#CBD5E1)}.r3 .rank{background:linear-gradient(135deg,#FED7AA,#FB923C)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}.tabs button{padding:8px 14px;border-radius:10px;border:1.5px solid var(--line);background:#fff;font:500 14px var(--h);cursor:pointer}.tabs button.on{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ---------- Footer ---------- */
.foot{background:#0E1650;color:#B9C5FF;padding:34px 0;font-size:14.5px;margin-top:40px}.foot b{color:#fff;font-family:var(--h);font-weight:500}.foot a{color:#fff}
.foot-in{display:grid;grid-template-columns:1.2fr 1.2fr 1fr;gap:20px}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .hero-in{grid-template-columns:1fr}.hero-art{display:none}
  .features,.links{grid-template-columns:1fr 1fr}
  .lgrid{grid-template-columns:1fr}.toc{position:static}
  .mystrip .card{grid-template-columns:auto 1fr;}.mystrip .stat{display:none}
}
@media (max-width:760px){
  body{font-size:16px}
  .burger{display:block}.mainnav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;background:#fff;padding:10px;border-bottom:1px solid var(--line);box-shadow:var(--sh2)}
  .topbar.open .mainnav{display:flex}.dd-menu{position:static;box-shadow:none;border:0;padding-left:16px}
  .me{margin-left:auto}.xpbar,.xpchip small,.streak{display:none}.topbar .burger{margin-left:0}
  .features,.links,.grid2,.grid3,.foot-in{grid-template-columns:1fr}
  .s-buckets{grid-template-columns:1fr}.m-grid{grid-template-columns:1fr}.pw-rules{grid-template-columns:1fr}
  .lsec{padding:20px 18px}.hero-in{padding:44px 20px 60px}.hero-stats{gap:18px}
  .lhero .big-ico{display:none}.path{overflow-x:auto}.node{width:60px}
  .avatars{grid-template-columns:repeat(6,1fr)}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}