:root{box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
--navy:#002050;--navy-d:#00133a;--navy-m:#0b3a73;--accent:#0078d4;--accent-h:#106ebe;--cyan:#50e6ff;--link:#0067b8;
--bg:#f3f2f1;--card:#fff;--text:#201f1e;--muted:#605e5c;--line:#d2d0ce;--ok:#107c10;--bad:#d13438}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#1b1a19;--card:#292827;--text:#f3f2f1;--muted:#c8c6c4;--line:#3b3a39;--link:#4cc2ff}}
:root[data-theme="dark"]{--bg:#1b1a19;--card:#292827;--text:#f3f2f1;--muted:#c8c6c4;--line:#3b3a39;--link:#4cc2ff}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:calc(110px + env(safe-area-inset-top,0px));scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 "Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:inherit;text-decoration:none}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:var(--card);border-bottom:1px solid var(--line)}
.top{display:flex;align-items:center;gap:8px;height:64px}
.logo{font-weight:700;font-size:21px;letter-spacing:-.3px;display:flex;align-items:center;gap:10px;color:var(--text)}
nav{margin-left:28px}nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2px}
nav a,nav button{display:inline-flex;align-items:center;gap:6px;height:38px;padding:0 14px;border-radius:6px;font:inherit;font-size:15px;color:var(--text);background:none;border:0;cursor:pointer}
nav a:hover,nav button:hover,nav button[aria-expanded=true]{background:var(--bg)}
nav button svg{transition:transform .2s}nav button[aria-expanded=true] svg{transform:rotate(180deg)}
.sp{flex:1}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:40px;padding:0 20px;border-radius:4px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;font-family:inherit}
.btn-o{background:var(--accent);color:#fff}.btn-o:hover{background:var(--accent-h)}
.btn-l{background:transparent;color:var(--text);border-color:var(--muted)}.btn-l:hover{background:var(--bg)}
.hero .btn-l{color:#fff;border-color:#fff}.hero .btn-l:hover{background:rgba(255,255,255,.12)}
.signin{font-size:15px;font-weight:600;padding:0 14px;height:40px;display:inline-flex;align-items:center;border-radius:6px;color:var(--text)}.signin:hover{background:var(--bg)}
.theme,.menu-btn{background:none;border:0;color:var(--text);width:40px;height:40px;border-radius:6px;cursor:pointer;display:grid;place-items:center}
.theme:hover,.menu-btn:hover{background:var(--bg)}.menu-btn{display:none}
.mega{display:none;position:absolute;left:0;right:0;top:100%;background:var(--card);border-bottom:1px solid var(--line);box-shadow:0 16px 32px rgba(0,0,0,.14)}
.mega.open{display:block}
.mega .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;padding-top:28px;padding-bottom:28px}
.mega h4{margin:0 0 10px;font-size:14px;padding-bottom:8px;border-bottom:2px solid var(--c);color:var(--text)}
.mega a{display:block;padding:5px 0;font-size:15px;color:var(--muted)}.mega a:hover{color:var(--accent)}
.hero{background:radial-gradient(circle at 88% 12%,rgba(80,230,255,.22),transparent 42%),radial-gradient(rgba(255,255,255,.09) 1px,transparent 1.5px) 0 0/24px 24px,linear-gradient(120deg,#00133a,#002050 50%,#0063b1);color:#fff;padding:72px 0 100px}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
h1{font-size:clamp(32px,4.6vw,52px);line-height:1.1;margin:0 0 16px;letter-spacing:-1px;font-weight:600}
.hero p{font-size:18px;color:#e1dfdd;max-width:52ch;margin:0 0 28px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .btn{height:46px;padding:0 24px;font-size:16px}
.stats{display:flex;gap:32px;margin-top:36px;flex-wrap:wrap}
.stats strong{display:block;font-size:28px;color:var(--cyan)}.stats span{font-size:14px;color:#c8c6c4}
.demo{background:var(--card);color:var(--text);border-radius:8px;border-top:5px solid var(--accent);padding:24px;box-shadow:0 20px 40px rgba(0,0,0,.35)}
.demo-h{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:10px}
.demo h3{margin:0 0 16px;font-size:19px;line-height:1.35}
.opt{display:block;width:100%;text-align:left;font:inherit;font-size:15px;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:11px 14px;margin-bottom:8px;cursor:pointer}
.opt:hover:not(:disabled){border-color:var(--accent)}
.opt.ok{background:rgba(29,129,2,.15);border-color:var(--ok)}.opt.bad{background:rgba(209,50,18,.14);border-color:var(--bad)}
.fb{min-height:22px;font-size:14px;color:var(--muted);margin:6px 0 10px}
.demo-f{display:flex;justify-content:space-between;align-items:center}
.demo-f button{background:none;border:0;color:var(--link);font:inherit;font-weight:700;cursor:pointer}
section{padding:60px 0}
h2{font-size:28px;font-weight:600;margin:0 0 8px;letter-spacing:-.4px}
h3{font-weight:600}
.sub{color:var(--muted);margin:0 0 28px;max-width:60ch}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.chip{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:20px;padding:6px 16px;font:inherit;font-size:14px;cursor:pointer}
.chip[aria-pressed=true]{background:var(--accent);color:#fff;border-color:var(--accent)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.empty{display:none;color:var(--muted);padding:24px 0}
.alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:s}
.steps div{counter-increment:s;padding-left:0}
.steps div::before{content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;margin-bottom:12px}
.steps div{position:relative}.steps div:not(:last-child)::after{content:"";position:absolute;top:17px;left:48px;right:8px;height:2px;background:var(--line)}
.steps h3{margin:0 0 4px;font-size:17px}.steps p{margin:0;color:var(--muted);font-size:14px}
.band{background:linear-gradient(120deg,var(--navy),#0063b1);color:#fff;border-radius:8px;padding:40px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.band h2{margin:0 0 4px}.band p{margin:0;color:#e1dfdd}
footer{background:#201f1e;color:#c8c6c4;padding:48px 0 28px;font-size:14px}
footer h4{color:#fff;margin:0 0 10px}footer a{display:block;padding:3px 0}footer a:hover{color:var(--cyan)}
.box{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:24px;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.g4{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
details{background:var(--card);border:1px solid var(--line);border-radius:8px;margin-bottom:12px;max-width:820px}
summary{cursor:pointer;padding:16px 20px;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::after{content:"+";font-size:22px;line-height:1;color:var(--link)}details[open] summary::after{content:"−"}
summary::-webkit-details-marker{display:none}
details p{margin:0;padding:0 20px 18px;color:var(--muted)}
details[open]{border-color:var(--accent)}
.hs{display:flex;align-items:center;gap:8px;background:#fff;border-radius:8px;padding:6px 6px 6px 14px;max-width:540px;box-shadow:0 8px 24px rgba(0,0,0,.28)}
.hs svg{flex:none;color:#605e5c}.hs:focus-within{outline:3px solid var(--cyan)}
.hs input{flex:1;min-width:0;border:0;outline:0;font:inherit;font-size:16px;color:#201f1e;background:transparent;height:40px}
.pop{margin-top:18px;font-size:14px;color:#c8c6c4;display:flex;gap:6px 16px;flex-wrap:wrap}.pop a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.strip{margin-top:-48px;position:relative;z-index:2}
.strip .box{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:26px 32px;box-shadow:0 10px 30px rgba(0,0,0,.14)}
.strip strong{display:block;font-size:32px;line-height:1.15;font-weight:600;color:var(--link)}.strip span{font-size:14px;color:var(--muted)}
.fcols{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:32px}
.copy{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;border-top:1px solid #3b3a39;margin-top:36px;padding-top:20px;font-size:13px}
.copy a{display:inline;padding:0;margin-left:18px}.copy a:first-child{margin-left:0}
.pill{display:inline-block;font-size:13px;font-weight:600;color:var(--link);background:color-mix(in srgb,var(--accent) 12%,transparent);padding:3px 12px;border-radius:20px;margin-bottom:12px}
.dqb{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center}
.dqd{width:190px;text-align:center;background:var(--card);border:1px solid var(--line);border-top:6px solid var(--accent);border-radius:8px;padding:16px 12px;box-shadow:0 8px 24px rgba(0,0,0,.1)}
.dqd small{display:block;color:var(--muted);font-size:14px}.dqd b{display:block;font-size:56px;line-height:1.1;font-weight:600;color:var(--link)}.dqd span{font-size:14px;color:var(--muted)}
.faqw{display:grid;grid-template-columns:1fr 1.8fr;gap:48px;align-items:start}.faqw details{max-width:none}
header.scrolled{box-shadow:0 2px 10px rgba(0,0,0,.1)}
.card{position:relative;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:22px;transition:border-color .15s,box-shadow .15s}
a.card:hover{border-color:var(--accent);box-shadow:0 6px 18px rgba(0,0,0,.1)}
.card-h{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.card-h small{display:block;font-size:12px;color:var(--muted);margin-bottom:2px}
.ic{width:46px;height:46px;flex:none;border-radius:10px;display:grid;place-items:center;background:var(--c,var(--accent));color:#fff;font-weight:600;font-size:17px;letter-spacing:.3px}
.card h3{margin:0;font-size:18px;line-height:1.25}
.card p{margin:0 0 18px;color:var(--muted);font-size:14px;flex:1}
.card .cat{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:8px}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--c);margin-right:7px}
.card-f{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:14px;font-size:13px;color:var(--muted)}
.card-f b{display:inline-flex;align-items:center;gap:4px;color:var(--link);font-size:14px;font-weight:600}
.card svg{transition:transform .15s}a.card:hover svg{transform:translateX(3px)}
.card.q h3{margin-bottom:6px}.card.q p{margin-bottom:16px}
.ex{flex-direction:row;align-items:center;justify-content:space-between;padding:18px 20px}
.ex h3{font-size:16px}.ex p{margin:2px 0 0;flex:none;font-size:13px}.ex>svg{color:var(--link);flex:none}
.g3{display:grid;grid-template-columns:repeat(3,1fr);gap:36px 40px}
.fi{width:46px;height:46px;border-radius:10px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--link);margin-bottom:14px}
.feat h3{margin:0 0 6px;font-size:17px}.feat p{margin:0;color:var(--muted);font-size:14px}
.crumb{font-size:14px;color:#c8c6c4;display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.crumb a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.phero{background:linear-gradient(120deg,#00133a,#002050 55%,#0063b1);color:#fff;padding:28px 0 32px}
.phero h1{font-size:clamp(28px,4vw,38px);margin:0 0 6px}.phero p{margin:0;color:#e1dfdd;max-width:62ch}
.ph-row{display:flex;gap:18px;align-items:center}
.phero .ic{width:64px;height:64px;font-size:24px;border-radius:14px;background:#fff;color:var(--c)}
.ph-stats{display:flex;gap:32px;margin-top:22px;font-size:14px;color:#c8c6c4}.ph-stats b{font-size:24px;font-weight:600;color:var(--cyan);margin-right:6px}
.lay{display:grid;grid-template-columns:1fr 300px;gap:32px;padding-top:36px;padding-bottom:60px;align-items:start}
.lh{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:16px;flex-wrap:wrap}.lh h2{margin:0}
.lh input{height:38px;border:1px solid var(--line);border-radius:4px;padding:0 12px;font:inherit;font-size:14px;background:var(--card);color:var(--text);min-width:220px}
.chap{display:flex;align-items:center;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px 18px;margin-bottom:10px;transition:border-color .15s,box-shadow .15s}
a.chap:hover{border-color:var(--accent);box-shadow:0 6px 18px rgba(0,0,0,.1)}
.cn{width:36px;height:36px;border-radius:50%;background:color-mix(in srgb,var(--c) 14%,transparent);color:var(--c);display:grid;place-items:center;font-weight:600;font-size:14px;flex:none}
.chap h3{margin:0;font-size:16px}.chap small{color:var(--muted);font-size:13px}
.chap .go{margin-left:auto;color:var(--link);font-weight:600;font-size:14px;display:inline-flex;align-items:center;gap:4px;white-space:nowrap}
.chap .soon{margin-left:auto;font-size:12px;color:var(--muted);border:1px solid var(--line);padding:2px 10px;border-radius:20px;white-space:nowrap}
.chap.off{background:transparent}.chap.off h3{color:var(--muted)}
a.chap:hover svg{transform:translateX(3px)}.chap svg{transition:transform .15s}
.side{position:sticky;top:calc(84px + env(safe-area-inset-top,0px));padding:18px}.side h3{margin:0 0 10px;font-size:16px}
.side a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:6px;font-size:14px;color:var(--text)}
.side a:hover{background:var(--bg)}.side a.on{background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--link);font-weight:600}
.side a i{width:8px;height:8px;border-radius:50%;background:var(--c);flex:none}
.qwrap{padding-top:28px;padding-bottom:60px;max-width:820px}.qwrap .crumb{color:var(--muted)}.qwrap .crumb a{color:var(--link)}
.qbox{padding:28px}
.qtop{display:flex;justify-content:space-between;font-size:14px;color:var(--muted);margin-bottom:10px}
.prog{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin-bottom:24px}.prog i{display:block;height:100%;background:var(--accent);transition:width .25s}
.qt{font-size:21px;line-height:1.4;margin:0 0 20px;font-weight:600}
.qo{display:flex;gap:12px;align-items:center;width:100%;text-align:left;font:inherit;font-size:16px;color:var(--text);background:var(--card);border:1.5px solid var(--line);border-radius:8px;padding:12px 16px;margin-bottom:10px;cursor:pointer}
.qo:hover:not(:disabled){border-color:var(--accent)}.qo:disabled{cursor:default;color:var(--text)}
.qo b{width:28px;height:28px;border-radius:50%;border:1.5px solid var(--line);display:grid;place-items:center;font-size:13px;flex:none}
.qo.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,transparent)}.qo.bad{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 12%,transparent)}
.qe{margin:6px 0 18px;padding:12px 16px;border-left:4px solid var(--accent);background:var(--bg);border-radius:4px;font-size:14px;color:var(--muted)}
.qf{display:flex;justify-content:space-between;align-items:center;margin-top:18px}
.res{text-align:center}.sb{font-size:60px;font-weight:600;color:var(--link);line-height:1.1}.sb span{font-size:26px;color:var(--muted)}
.cta2{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.rv{margin-top:28px}.rv h3{margin:0 0 8px}.rv>div{padding:12px 0;border-top:1px solid var(--line);font-size:14px}.rv .t{font-weight:600;margin-bottom:4px}
@media (max-width:900px){.g3{grid-template-columns:1fr 1fr}.lay{grid-template-columns:1fr}.side{position:static}.ph-stats{gap:20px}.hero .wrap,.steps,.fcols{grid-template-columns:1fr 1fr}.hero .wrap{grid-template-columns:1fr}
.mega .wrap{grid-template-columns:1fr 1fr}.menu-btn{display:grid}.signin{display:none}
nav{display:none;position:absolute;left:0;right:0;top:100%;margin:0;background:var(--card);border-bottom:1px solid var(--line);padding:8px 20px 12px}
nav.show{display:block}nav ul{flex-direction:column}.mega{max-height:70vh;overflow:auto}
.strip .box{grid-template-columns:1fr 1fr}.band{padding:28px}.dqb,.faqw{grid-template-columns:1fr}.steps div::after{display:none!important}}
@media (max-width:560px){.steps,.fcols,.g3{grid-template-columns:1fr}.hero{padding:40px 0 72px}.hs .btn{display:none}.top .btn-o{display:none}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* book-style chapter page */
.rp{position:fixed;left:0;right:0;top:calc(64px + env(safe-area-inset-top,0px));height:3px;z-index:49;background:transparent}.rp i{display:block;height:100%;width:0;background:var(--cyan)}
.bk-hero{position:relative;overflow:hidden;background:radial-gradient(circle at 85% 20%,rgba(80,230,255,.2),transparent 45%),linear-gradient(120deg,#00133a,#002050 55%,#0063b1);color:#fff;padding:28px 0 52px}
.bk-hero .wrap{position:relative;z-index:1}
.bk-lab{display:inline-block;font:600 13px Poppins,"Segoe UI",system-ui,sans-serif;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);margin-bottom:12px}
.bk-hero h1{font-family:"Playfair Display",Georgia,serif;font-size:clamp(34px,5.4vw,58px);line-height:1.1;margin:0 0 14px;font-weight:700;letter-spacing:-.5px;max-width:20ch}
.bk-sub{font-family:Lora,Georgia,serif;font-style:italic;font-size:clamp(17px,2vw,20px);color:#e1dfdd;max-width:56ch;margin:0 0 24px}
.bk-meta{display:flex;gap:10px;flex-wrap:wrap}.bk-meta span{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);padding:6px 14px;border-radius:20px;font-size:14px}.bk-meta i{color:var(--cyan)}
.bk-wm{position:absolute;right:5%;top:50%;transform:translateY(-50%);font-size:220px;opacity:.08;pointer-events:none}
.bk-lay{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:56px;padding-top:48px;padding-bottom:64px;align-items:start}
.bk-art{max-width:720px;font-family:Lora,Georgia,serif;font-size:18px;line-height:1.85}
.bk-s{margin-bottom:46px;scroll-margin-top:90px}
.bk-h{margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.bk-no{display:block;font:700 12px Poppins,"Segoe UI",system-ui,sans-serif;letter-spacing:.18em;color:var(--link);margin-bottom:8px}
.bk-h h2{display:flex;align-items:center;gap:14px;margin:0;font:600 clamp(22px,3vw,29px)/1.25 Poppins,"Segoe UI",system-ui,sans-serif;letter-spacing:-.2px}
.bk-h h2 i{width:46px;height:46px;flex:none;border-radius:12px;display:grid;place-items:center;font-size:19px;background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--link)}
.bk-art p{margin:0 0 18px}
.bk-art p.drop::first-letter{float:left;font:700 68px/.85 "Playfair Display",Georgia,serif;padding:8px 12px 0 0;color:var(--link)}
.bk-art b{font-weight:700;background:linear-gradient(transparent 62%,color-mix(in srgb,var(--cyan) 38%,transparent) 0)}
.co{display:flex;gap:14px;margin:24px 0;padding:16px 20px;border-radius:10px;border-left:4px solid var(--k);background:color-mix(in srgb,var(--k) 10%,transparent);font:15px/1.65 Poppins,"Segoe UI",system-ui,sans-serif}
.co>i{color:var(--k);font-size:20px;margin-top:3px}.co strong{display:block;color:var(--k);margin-bottom:2px;font-weight:600}
.co-tip{--k:#ca5010}.co-key{--k:#0078d4}.co-note{--k:#107c10}
.bk-t{overflow-x:auto;margin:24px 0;border:1px solid var(--line);border-radius:10px}
.bk-t table{border-collapse:collapse;width:100%;font:15px/1.5 Poppins,"Segoe UI",system-ui,sans-serif}
.bk-t th{background:var(--navy);color:#fff;text-align:left;padding:11px 16px;font-weight:600;white-space:nowrap}
.bk-t td{padding:11px 16px;border-top:1px solid var(--line)}.bk-t tbody tr:nth-child(even) td{background:var(--bg)}
.bk-sum{background:var(--card);border:1px solid var(--line);border-top:5px solid var(--accent);border-radius:10px;padding:24px 26px;margin:10px 0 28px;font-family:Poppins,"Segoe UI",system-ui,sans-serif;font-size:15.5px;line-height:1.6;scroll-margin-top:90px}
.bk-sum h2{display:flex;align-items:center;gap:10px;font-size:21px;margin:0 0 14px}.bk-sum h2 i{color:var(--link)}
.bk-sum ul{list-style:none;margin:0;padding:0}.bk-sum li{display:flex;gap:12px;margin-bottom:10px}.bk-sum li i{color:var(--ok);margin-top:5px}
.bk-cta h2{font-family:Poppins,"Segoe UI",system-ui,sans-serif;font-size:22px}
.bk-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:28px;font-family:Poppins,"Segoe UI",system-ui,sans-serif}
.bk-nav a{display:block;border:1px solid var(--line);background:var(--card);border-radius:10px;padding:14px 18px;transition:border-color .15s}.bk-nav a:hover{border-color:var(--accent)}
.bk-nav small{display:block;color:var(--muted);font-size:13px;margin-bottom:2px}.bk-nav b{font-size:15px;color:var(--link)}
.bk-toc{position:sticky;top:calc(88px + env(safe-area-inset-top,0px));padding:20px}
.bk-toc h3{margin:0 0 12px;font:600 15px Poppins,"Segoe UI",system-ui,sans-serif;display:flex;gap:10px;align-items:center}.bk-toc h3 i{color:var(--link)}
.bk-toc button{display:flex;align-items:center;gap:12px;width:100%;text-align:left;background:none;border:0;border-radius:8px;padding:9px 10px;font:14px/1.35 Poppins,"Segoe UI",system-ui,sans-serif;color:var(--text);cursor:pointer}
.bk-toc button:hover{background:var(--bg);color:var(--link)}.bk-toc button i{width:18px;text-align:center;color:var(--link);flex:none}
@media (max-width:900px){.bk-lay{grid-template-columns:1fr}.bk-toc{display:none}.bk-wm{font-size:140px;right:-10px}.bk-nav{grid-template-columns:1fr}}
@media (max-width:560px){.bk-art{font-size:17px}.bk-art p.drop::first-letter{font-size:56px}}
/* auth pages + user menu */
.au{display:grid;grid-template-columns:1fr 1.1fr;min-height:calc(100vh - 64px)}
.au-side{background:radial-gradient(circle at 85% 15%,rgba(80,230,255,.22),transparent 45%),radial-gradient(rgba(255,255,255,.08) 1px,transparent 1.5px) 0 0/24px 24px,linear-gradient(130deg,#00133a,#002050 55%,#0063b1);color:#fff;padding:64px 56px;display:flex;align-items:center}
.au-side h2{font-size:clamp(30px,3.6vw,46px);line-height:1.12;margin:0 0 14px;letter-spacing:-.8px}
.au-side p{color:#e1dfdd;font-size:17px;max-width:42ch;margin:0 0 30px}
.au-side ul{list-style:none;margin:0;padding:0}.au-side li{display:flex;gap:14px;align-items:center;margin-bottom:16px;font-size:16px}
.au-side li i{width:42px;height:42px;border-radius:10px;background:rgba(255,255,255,.14);display:grid;place-items:center;color:var(--cyan);font-size:17px;flex:none}
.au-main{display:grid;place-items:center;padding:40px 20px}
.au-card{width:100%;max-width:430px}
.au-card h1{font-size:30px;line-height:1.2;margin:0 0 6px;letter-spacing:-.5px}
.au-card .lead{color:var(--muted);margin:0 0 24px}
.gwrap{min-height:44px;display:flex;justify-content:center}
.gfb{display:flex;align-items:center;justify-content:center;gap:12px;width:100%;height:44px;border:1px solid var(--line);border-radius:6px;background:var(--card);color:var(--text);font:600 15px inherit;font-family:inherit;cursor:pointer}
.gfb:hover:not(:disabled){background:var(--bg);border-color:var(--muted)}
.or{display:flex;align-items:center;gap:14px;margin:22px 0;color:var(--muted);font-size:13px}.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
.inp{display:block;margin-bottom:16px}.inp>span{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.inw{position:relative;display:flex;align-items:center}
.inw>i{position:absolute;left:14px;color:var(--muted);font-size:15px;pointer-events:none}
.inw input{width:100%;height:46px;padding:0 44px 0 42px;border:1px solid var(--line);border-radius:6px;background:var(--card);color:var(--text);font:inherit;font-size:15px}
.inw input:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}
.eye{position:absolute;right:4px;width:38px;height:38px;border:0;background:none;color:var(--muted);cursor:pointer;border-radius:6px}.eye:hover{color:var(--text)}
.rowf{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px;font-size:14px}.rowf a,.ck a,.sw a{color:var(--link);font-weight:600}
.ck{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted);margin-bottom:6px}.ck input{margin-top:4px;accent-color:var(--accent)}
.msg{min-height:22px;margin:10px 0;font-size:14px}.msg.bad{color:var(--bad)}.msg.ok{color:var(--ok)}
.au-go{width:100%;height:46px;font-size:16px}
.sw{text-align:center;margin:20px 0 0;font-size:14.5px;color:var(--muted)}
.um{position:relative}.um[hidden],.umd[hidden]{display:none}
.um>button{display:flex;align-items:center;gap:8px;height:40px;padding:0 8px;border:0;background:none;border-radius:6px;color:var(--text);font:inherit;font-size:15px;font-weight:600;cursor:pointer}.um>button:hover{background:var(--bg)}
.av{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:14px;overflow:hidden}.av img{width:100%;height:100%;object-fit:cover}
.umd{position:absolute;right:0;top:46px;min-width:230px;background:var(--card);border:1px solid var(--line);border-radius:8px;box-shadow:0 12px 28px rgba(0,0,0,.18);padding:8px;z-index:60}
.umd .who{padding:8px 10px 10px;border-bottom:1px solid var(--line);margin-bottom:6px;font-size:14px;line-height:1.4}.umd .who b{display:block}.umd .who span{color:var(--muted);word-break:break-all}
.umd button{display:flex;align-items:center;gap:10px;width:100%;height:38px;padding:0 10px;border:0;background:none;color:var(--text);font:inherit;font-size:14px;border-radius:6px;cursor:pointer}.umd button:hover{background:var(--bg)}
.mnav{display:none}
@media (max-width:900px){.au{grid-template-columns:1fr}.au-side{display:none}.mnav{display:block}.mnav[hidden]{display:none}#unm{display:none}}
[hidden]{display:none!important}
.content-form{padding:24px;max-width:640px}.content-form label{display:block;margin:16px 0}.content-form input,.content-form textarea{display:block;width:100%;padding:12px;margin-top:8px;border:1px solid var(--border,#ddd);border-radius:6px;background:var(--bg,#fff);color:inherit}.content-form textarea{resize:vertical}
.daily-page{padding-top:30px;padding-bottom:64px}.daily-hero{background:linear-gradient(120deg,#002050,#0078d4);border-radius:24px;color:#fff;padding:44px;display:flex;align-items:center;justify-content:space-between;gap:24px;overflow:hidden}.daily-hero h1{font-size:clamp(30px,4vw,48px);line-height:1.2;margin:16px 0}.daily-hero p{max-width:540px;color:#e0eeff}.daily-hero>div>span:last-child{font-size:13px;color:#cbe2ff}.daily-label{font-size:12px;font-weight:700;letter-spacing:1.6px;color:var(--accent)}.daily-hero .daily-label{color:#8deaff}.daily-orbit{width:180px;height:180px;border:1px solid #ffffff40;border-radius:50%;display:grid;place-items:center;position:relative;flex-shrink:0}.daily-orbit span{font-size:110px;line-height:1;font-weight:800;color:#ffffffee}.daily-orbit b{position:absolute;right:-12px;top:8px;background:#50e6ff;color:#002050;width:52px;height:52px;border-radius:16px;text-align:center;font-size:34px;transform:rotate(12deg)}.daily-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}.daily-stats .box{padding:22px}.daily-stats strong{display:block;font-size:28px;color:var(--link)}.daily-stats span{font-size:13px;color:var(--muted)}.daily-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:28px 0}.daily-heading h2{margin:0}.daily-heading .daily-label{margin-left:12px}.daily-heading p{color:var(--muted)}.daily-question{padding:24px;margin:0 0 24px;min-width:0}.daily-question legend{padding:0 12px;font-size:18px;font-weight:600;max-width:100%;overflow-wrap:anywhere}.daily-question legend>span{display:inline-grid;place-items:center;background:var(--accent);color:white;border-radius:10px;width:32px;height:32px;margin-right:8px;font-size:14px}.daily-option{display:flex;gap:12px;align-items:center;padding:14px 16px;border:1px solid var(--line);border-radius:12px;margin:10px 0;cursor:pointer;overflow-wrap:anywhere}.daily-option:has(input:checked){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 9%,var(--card))}.daily-option input{accent-color:var(--accent);flex-shrink:0}.daily-option>span{font-size:12px;color:var(--muted);font-weight:700}.daily-submit{padding:24px;display:flex;justify-content:space-between;gap:20px;align-items:center}.daily-submit p{color:var(--muted);font-size:14px}.daily-notice{padding:16px 20px;border:1px solid var(--line);border-radius:12px;background:var(--card)}.daily-empty{padding:40px;text-align:center;margin:28px 0}.daily-review{padding:24px;margin-top:30px}.daily-review summary{cursor:pointer;font-size:18px;font-weight:700}.daily-review-item{padding:20px 0;border-bottom:1px solid var(--line)}.daily-review-item:last-child{border:0}.daily-correct{color:var(--ok)}.daily-incorrect{color:var(--bad)}.destination-page{min-height:75vh;text-align:center;padding-top:65px;padding-bottom:70px;display:flex;flex-direction:column;align-items:center;justify-content:center}.destination-page h1{font-size:clamp(30px,4vw,48px);line-height:1.2;max-width:680px;margin:18px 0}.destination-page p{color:var(--muted);max-width:600px}.destination-art{color:var(--accent);margin-bottom:22px}.destination-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:24px 0}.exam-pills{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:18px}.exam-pills span{padding:7px 18px;border:1px solid var(--line);border-radius:50px;color:var(--muted);font-size:13px}.error-number{display:flex;align-items:center;gap:8px;font-size:clamp(100px,20vw,190px);font-weight:800;line-height:1;color:var(--accent);letter-spacing:-8px;margin-bottom:24px}.error-number span{display:grid;place-items:center;background:linear-gradient(135deg,#002050,#0078d4);color:#50e6ff;border-radius:30px;width:clamp(90px,18vw,160px);height:clamp(110px,20vw,170px);font-size:clamp(70px,14vw,130px);transform:rotate(-9deg);letter-spacing:0}.error-tip{font-size:13px;margin-top:12px}@media(max-width:650px){.daily-hero{padding:28px 22px}.daily-orbit{display:none}.daily-stats{gap:8px}.daily-stats .box{padding:14px 10px}.daily-stats strong{font-size:22px}.daily-heading,.daily-submit{align-items:flex-start;flex-direction:column}.daily-question{padding:18px 12px}.daily-question legend{font-size:16px}.daily-option{padding:12px}.daily-empty{padding:28px 16px}.destination-page{padding-top:40px}.daily-review{padding:18px}}
.site-logo-image{width:auto;max-width:110px;height:32px;object-fit:contain;flex-shrink:0}.site-contact-email{display:block;margin-top:14px;color:#fff!important;overflow-wrap:anywhere}.site-contact-line a{color:var(--link);text-decoration:underline}