:root{
  --paper:#F7F3EA; --paper-2:#EDE7D9; --card:#FFFDF8;
  --ink:#12151B; --ink-2:#2D333D; --muted:#6B675F; --line:rgba(18,21,27,.12);
  --gold:#EBBB2E; --gold-soft:#F6DD8C; --gold-deep:#B5850A; --night:#0C0E12;
  --ease:cubic-bezier(.32,.72,0,1); --spring:cubic-bezier(.16,1,.3,1);
  --serif:"Fraunces",Georgia,serif; --sans:"Be Vietnam Pro",system-ui,sans-serif; --mono:"JetBrains Mono",ui-monospace,monospace;
  --r-xl:1.75rem;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit;color:inherit}
.mono{font-family:var(--mono)}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}
section[id]{scroll-margin-top:90px}
.serif{font-family:var(--serif);font-weight:500;letter-spacing:-.02em}
i.acc,em.acc{font-family:var(--serif);font-style:italic;font-weight:500;color:var(--gold-deep)}

/* nhãn nhỏ */
.kick{display:inline-flex;align-items:center;gap:.7rem;font-size:12px;letter-spacing:.2em;text-transform:uppercase;font-weight:600;color:var(--gold-deep)}
.kick::before{content:"";width:2.2rem;height:1px;background:currentColor}
.pill{display:inline-flex;align-items:center;gap:.6rem;border-radius:999px;padding:.4rem .95rem;font-size:12.5px;font-weight:600;letter-spacing:.04em;background:rgba(235,187,46,.1);color:var(--gold-soft);box-shadow:inset 0 0 0 1px rgba(235,187,46,.35)}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--gold);animation:pulse 2.4s var(--ease) infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(235,187,46,.5)}70%{box-shadow:0 0 0 9px rgba(235,187,46,0)}100%{box-shadow:0 0 0 0 rgba(235,187,46,0)}}

/* nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.7rem;border-radius:.9rem;padding:.85rem 1.4rem;font-weight:600;font-size:16px;border:0;cursor:pointer;white-space:nowrap;transition:transform .5s var(--spring),background .4s var(--ease),box-shadow .4s var(--ease)}
.btn:active{transform:scale(.98)}
.btn svg{transition:transform .5s var(--spring)}
.btn:hover svg{transform:translateX(4px)}
.btn-gold{background:linear-gradient(180deg,#F3C947,#E2AE1C);color:var(--ink);box-shadow:inset 0 1px 0 rgba(255,255,255,.45),0 14px 30px -14px rgba(235,187,46,.7)}
.btn-gold:hover{box-shadow:inset 0 1px 0 rgba(255,255,255,.45),0 18px 34px -12px rgba(235,187,46,.85)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{background:#000}
.btn-line{background:transparent;box-shadow:inset 0 0 0 1px var(--line)}
.btn-line:hover{background:rgba(18,21,27,.05)}
.on-dark .btn-line{color:#fff;box-shadow:inset 0 0 0 1px rgba(255,255,255,.22)}
.on-dark .btn-line:hover{background:rgba(255,255,255,.07)}
.btn-sm{padding:.55rem 1rem;font-size:14.5px;border-radius:.75rem}

/* thanh menu */
.nav{position:fixed;top:0;left:0;right:0;z-index:60;background:rgba(12,14,18,.82);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.07);color:#fff}
.nav .wrap{display:flex;align-items:center;gap:2rem;height:64px}
.brand{font-weight:800;letter-spacing:.02em;display:flex;align-items:center;gap:.6rem;font-size:15.5px;text-transform:uppercase}
.brand b{display:grid;place-items:center;width:2rem;height:2rem;border-radius:50%;background:var(--gold);color:var(--ink);font-size:14px}
.nav ul{display:flex;gap:.4rem;list-style:none;font-size:15px}
.nav ul a{padding:.4rem .8rem;border-radius:.6rem;color:rgba(255,255,255,.72);transition:color .3s,background .3s}
.nav ul a:hover,.nav ul a.cur{color:#fff;background:rgba(255,255,255,.08)}
.nav .sp{flex:1}
.burger{display:none;width:2.6rem;height:2.6rem;border:0;background:transparent;position:relative;cursor:pointer}
.burger span{position:absolute;left:.55rem;right:.55rem;height:2px;background:#fff;border-radius:2px;transition:transform .5s var(--spring),top .5s var(--spring),opacity .3s}
.burger span:nth-child(1){top:.85rem}.burger span:nth-child(2){top:1.25rem}.burger span:nth-child(3){top:1.65rem}
.menu-open .burger span:nth-child(1){top:1.25rem;transform:rotate(45deg)}
.menu-open .burger span:nth-child(2){opacity:0}
.menu-open .burger span:nth-child(3){top:1.25rem;transform:rotate(-45deg)}
.overlay{position:fixed;inset:64px 0 0 0;z-index:55;background:rgba(12,14,18,.96);display:flex;flex-direction:column;padding:2rem 28px;opacity:0;pointer-events:none;transition:opacity .4s var(--ease)}
.overlay a{color:#fff;font-family:var(--serif);font-size:2rem;padding:.5rem 0;border-bottom:1px solid rgba(255,255,255,.08);transform:translateY(1.5rem);opacity:0;transition:transform .7s var(--spring),opacity .5s var(--ease)}
.menu-open .overlay{opacity:1;pointer-events:auto}
.menu-open .overlay a{transform:none;opacity:1}
.menu-open .overlay a:nth-child(2){transition-delay:.05s}.menu-open .overlay a:nth-child(3){transition-delay:.1s}.menu-open .overlay a:nth-child(4){transition-delay:.15s}

/* mở đầu nền tối */
.hero{position:relative;min-height:100dvh;background:radial-gradient(90% 70% at 20% 0%,#1d1806 0%,transparent 60%),var(--night);color:#fff;display:flex;flex-direction:column;justify-content:center;padding:130px 0 0;overflow:hidden}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.9}
.hero .wrap{position:relative;width:100%}
.hero h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.6rem,6.2vw,5.2rem);line-height:1.06;letter-spacing:-.03em;margin:1.6rem 0 1.4rem}
.hero h1 .typed{display:block;min-height:1.1em;text-transform:uppercase;letter-spacing:.01em}
.hero h1 .bar{display:inline-block;width:3px;height:.85em;background:var(--gold);margin-left:.12em;vertical-align:-.06em;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.hero p.lead{font-size:clamp(1.05rem,1.5vw,1.25rem);color:rgba(255,255,255,.74);max-width:36rem}
.hero .ctas{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:2.2rem}
.hero .proof{display:flex;align-items:center;gap:.8rem;margin-top:1.8rem;font-size:14.5px;color:rgba(255,255,255,.8)}
.hero .proof i{width:8px;height:8px;border-radius:50%;background:var(--gold);animation:pulse 2.4s var(--ease) infinite}
.tools{position:relative;margin-top:clamp(3rem,8vh,6rem);padding:1.6rem 0 2.2rem;border-top:1px solid rgba(255,255,255,.07);overflow:hidden}
.tools .lbl{text-align:center;font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:rgba(255,255,255,.45);font-weight:600;margin-bottom:1.1rem}
.track{display:flex;width:max-content;gap:.8rem;animation:mq 46s linear infinite}
.track span{padding:.75rem 1.4rem;border-radius:.8rem;background:rgba(255,255,255,.05);box-shadow:inset 0 0 0 1px rgba(255,255,255,.09);font-weight:600;font-size:15px;white-space:nowrap;color:rgba(255,255,255,.88)}
@keyframes mq{to{transform:translateX(-50%)}}

/* phần nền sáng */
section.s{padding:clamp(4.5rem,9vw,8rem) 0}
.h2{font-family:var(--serif);font-weight:500;font-size:clamp(2.1rem,4.4vw,3.6rem);line-height:1.1;letter-spacing:-.03em;margin:1.1rem 0 1.2rem;max-width:18ch}
.sub{color:var(--ink-2);max-width:36rem}
.glow{position:relative}
.glow::before{content:"";position:absolute;inset:0;background:radial-gradient(50% 40% at 85% 10%,rgba(235,187,46,.16),transparent 70%),radial-gradient(40% 40% at 5% 90%,rgba(235,187,46,.1),transparent 70%);pointer-events:none}
.glow>.wrap{position:relative}

/* thẻ */
.cards{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:3rem}
.card{display:block;background:var(--card);border-radius:var(--r-xl);padding:2.2rem;box-shadow:inset 0 0 0 1px var(--line),0 30px 50px -40px rgba(18,21,27,.4);transition:transform .7s var(--spring),box-shadow .5s var(--ease)}
a.card:hover{transform:translateY(-6px);box-shadow:inset 0 0 0 1px rgba(181,133,10,.45),0 40px 60px -40px rgba(181,133,10,.5)}
.card .ico{width:3rem;height:3rem;border-radius:.9rem;display:grid;place-items:center;background:rgba(235,187,46,.16);color:var(--gold-deep);box-shadow:inset 0 0 0 1px rgba(181,133,10,.3)}
.card h3{font-family:var(--serif);font-weight:500;font-size:clamp(1.5rem,2.4vw,2rem);line-height:1.2;letter-spacing:-.02em;margin:1.4rem 0 .7rem}
.card p{color:var(--ink-2);font-size:16px}
.card .more{display:inline-flex;align-items:center;gap:.5rem;margin-top:1.4rem;padding:.5rem 1rem;border-radius:999px;box-shadow:inset 0 0 0 1px var(--line);font-size:14.5px;font-weight:600}
.card .more svg{transition:transform .5s var(--spring)}
a.card:hover .more svg{transform:translateX(4px)}

/* khung trợ lý */
.sys{display:grid;grid-template-columns:.9fr 1.1fr;gap:4rem;align-items:center}
.rules{list-style:none;margin-top:2rem;display:grid;gap:1rem}
.rules li{display:flex;gap:.9rem;align-items:flex-start;padding-top:1rem;border-top:1px solid var(--line)}
.rules li svg{flex:none;margin-top:.3rem;color:var(--gold-deep)}
.term{background:var(--night);color:#fff;border-radius:var(--r-xl);box-shadow:0 40px 70px -40px rgba(18,21,27,.7);overflow:hidden}
.term .bar{display:flex;align-items:center;gap:.45rem;padding:.9rem 1.2rem;border-bottom:1px solid rgba(255,255,255,.08);font-size:12.5px;color:rgba(255,255,255,.5)}
.term .bar i{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.14)}
.term .bar i:first-child{background:var(--gold)}
.term .bar span{margin-left:auto}
.term .body{padding:1.5rem 1.4rem 1.8rem;min-height:410px;font-size:14.5px}
.prompt{display:flex;gap:.6rem;align-items:baseline;font-weight:500}
.prompt .who{color:var(--gold);font-weight:600;white-space:nowrap}
.caret{display:inline-block;width:.55em;height:1.1em;background:#fff;vertical-align:-.15em;margin-left:2px;animation:blink 1s steps(1) infinite}
.steps{list-style:none;margin-top:1.2rem;display:grid;gap:.55rem}
.steps li{display:flex;gap:.7rem;align-items:center;padding:.62rem .85rem;border-radius:.8rem;background:rgba(255,255,255,.05);opacity:0;transform:translateY(10px);transition:opacity .6s var(--ease),transform .7s var(--spring)}
.steps li.on{opacity:1;transform:none}
.steps li>span:nth-child(2){flex:1;min-width:0}
.steps li b{font-weight:600}
.steps li small{display:block;color:rgba(255,255,255,.5);font-size:12.5px}
.steps .st{font-size:12px;padding:.18rem .6rem;border-radius:999px;background:rgba(255,255,255,.08);color:rgba(255,255,255,.7);white-space:nowrap}
.steps .st.ok{background:rgba(235,187,46,.2);color:var(--gold-soft)}
.steps .st.wait{background:var(--gold);color:var(--ink)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--gold);flex:none}
.term .note{margin-top:1.2rem;font-size:12.5px;color:rgba(255,255,255,.45)}

/* ba luật */
.dark{background:var(--night);color:#fff}
.dark .sub{color:rgba(255,255,255,.7)}
.dark .kick{color:var(--gold)}
.law{display:grid;grid-template-columns:repeat(3,1fr);margin-top:3.5rem;border-top:1px solid rgba(255,255,255,.12)}
.law>div{padding:2.2rem 2rem 0 0}
.law>div+div{padding-left:2rem;border-left:1px solid rgba(255,255,255,.12)}
.law .k{font-family:var(--serif);font-style:italic;font-size:clamp(1.5rem,2.4vw,2rem);line-height:1.2;color:var(--gold)}
.law p{margin-top:.8rem;color:rgba(255,255,255,.7);font-size:16px}

/* đăng ký */
.signup{display:grid;grid-template-columns:1.15fr .85fr;background:var(--card);border-radius:var(--r-xl);overflow:hidden;box-shadow:inset 0 0 0 1px var(--line),0 40px 70px -50px rgba(18,21,27,.5)}
.form{padding:clamp(1.8rem,4vw,3.2rem)}
.form .h2{font-size:clamp(1.8rem,3.2vw,2.6rem);max-width:none}
.fields{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem;margin-top:1.6rem}
.field{display:grid;gap:.45rem}
.field.full{grid-column:1/-1}
.field label{font-size:14px;font-weight:600}
.field input,.field select{height:3.2rem;border-radius:.8rem;border:0;background:var(--paper);box-shadow:inset 0 0 0 1px var(--line);padding:0 1rem;font-size:16px;outline:none;transition:box-shadow .3s}
.field input:focus,.field select:focus{box-shadow:inset 0 0 0 2px var(--gold-deep)}
.field .err{font-size:13px;color:#A3271B;min-height:1.1em}
.field.bad input{box-shadow:inset 0 0 0 2px #C0392B}
.picks{display:flex;flex-wrap:wrap;gap:.5rem}
.picks label{cursor:pointer}
.picks input{position:absolute;opacity:0;pointer-events:none}
.picks span{display:inline-block;padding:.5rem .95rem;border-radius:999px;background:var(--paper);box-shadow:inset 0 0 0 1px var(--line);font-size:14.5px;font-weight:500;transition:background .3s,color .3s}
.picks input:checked+span{background:var(--ink);color:var(--paper)}
.picks input:focus-visible+span{outline:2px solid var(--gold-deep);outline-offset:2px}
.form .help{font-size:13.5px;color:var(--muted);margin-top:1rem}
.form .go{margin-top:1.5rem}
.done{display:none}
.sent .fields,.sent .go,.sent .help{display:none}
.sent .done{display:block;margin-top:1.6rem}
.done .box{padding:1.2rem 1.3rem;border-radius:1rem;background:var(--paper);box-shadow:inset 0 0 0 1px var(--line)}
.done pre{white-space:pre-wrap;font-family:var(--mono);font-size:13.5px;margin-top:.6rem;color:var(--ink-2)}
.done .row{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.2rem}
.side-img{position:relative;background:var(--gold);min-height:420px;overflow:hidden}
.side-img::before,.grid-bg::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(90deg,rgba(18,21,27,.07) 0 1px,transparent 1px 44px),repeating-linear-gradient(0deg,rgba(18,21,27,.07) 0 1px,transparent 1px 44px)}
.side-img img{position:absolute;bottom:0;right:-6%;height:92%;width:auto;max-width:none}
.side-img .call{position:absolute;left:1.4rem;top:1.4rem;background:var(--ink);color:#fff;border-radius:.9rem;padding:.8rem 1.05rem;font-size:13.5px}
.side-img .call b{display:block;color:var(--gold);font-size:1.15rem;letter-spacing:.02em}

/* trang phụ: mở đầu nền sáng */
.top{padding:150px 0 0;position:relative;overflow:hidden}
.top .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:3rem;align-items:end}
.top h1{font-family:var(--serif);font-weight:500;font-size:clamp(2.5rem,5.6vw,4.8rem);line-height:1.06;letter-spacing:-.03em;margin:1.3rem 0 1.4rem}
.top h1 .g{color:var(--gold-deep)}
.top h1 u{text-decoration-color:var(--gold);text-decoration-thickness:3px;text-underline-offset:.14em}
.top .lead{color:var(--ink-2);max-width:36rem;font-size:1.08rem}
.top .txt{padding-bottom:4.5rem}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin:1.6rem 0 1.8rem}
.chips span{display:inline-flex;align-items:center;gap:.5rem;padding:.4rem .9rem;border-radius:999px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);font-size:14px;font-weight:500}
.chips span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--gold-deep)}
.top .ph{position:relative;align-self:end;height:min(76vh,640px)}
.top .ph::before{content:"";position:absolute;left:8%;right:0;bottom:0;height:74%;border-radius:var(--r-xl) var(--r-xl) 0 0;background:var(--gold)}
.top .ph img{position:absolute;bottom:0;left:50%;transform:translateX(-46%);height:100%;width:auto;max-width:none}
.band{background:var(--ink);color:#fff;padding:1rem 0;overflow:hidden}
.band .track{animation-duration:38s;gap:0}
.band .track span{background:none;box-shadow:none;padding:0 1.6rem;font-size:13.5px;letter-spacing:.2em;text-transform:uppercase;display:inline-flex;align-items:center;gap:3.2rem;color:rgba(255,255,255,.85)}
.band .track span::after{content:"";width:7px;height:7px;background:var(--gold);transform:rotate(45deg)}

/* câu chuyện */
.story{display:grid;grid-template-columns:.75fr 1.25fr;gap:4rem;padding:3.5rem 0;border-top:1px solid var(--line)}
.story .when{font-size:12.5px;letter-spacing:.18em;text-transform:uppercase;font-weight:600;color:var(--gold-deep)}
.story h3{font-family:var(--serif);font-weight:500;font-size:clamp(1.6rem,2.8vw,2.3rem);line-height:1.18;letter-spacing:-.02em;margin-top:.8rem}
.story ul{list-style:none;margin-top:1.4rem;display:grid;gap:.5rem;font-size:15px;font-weight:500}
.story ul li{display:flex;gap:.6rem;align-items:center}
.story ul li::before{content:"";width:6px;height:6px;background:var(--gold-deep);transform:rotate(45deg);flex:none}
.story .tx p{color:var(--ink-2);margin-bottom:1rem;max-width:40rem}
.story .tx p.big{font-family:var(--serif);font-size:1.35rem;line-height:1.4;color:var(--ink)}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;margin-top:3rem}
.facts div{padding:1.4rem 0 0;border-top:2px solid var(--gold)}
.facts dt{font-family:var(--serif);font-size:1.5rem;line-height:1.2}
.facts dd{margin-top:.4rem;color:var(--muted);font-size:14.5px}

/* lộ trình */
.road{display:grid;grid-template-columns:.8fr 1.2fr;gap:4rem;align-items:start}
.road .side{position:sticky;top:110px}
.mods{list-style:none}
.mod{display:grid;grid-template-columns:4rem 1fr;gap:1.2rem;padding:2rem 0;border-top:1px solid var(--line)}
.mod:last-child{border-bottom:1px solid var(--line)}
.mod .n{font-family:var(--serif);font-style:italic;font-size:1.6rem;color:var(--gold-deep);line-height:1.2}
.mod h3{font-family:var(--serif);font-weight:500;font-size:1.55rem;letter-spacing:-.02em;line-height:1.25}
.mod p{color:var(--ink-2);margin-top:.5rem}
.mod .out{margin-top:.9rem;padding:.75rem 1rem;border-radius:.8rem;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);font-size:15px}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.9rem}
.tags span{font-size:12.5px;padding:.2rem .7rem;border-radius:999px;background:rgba(18,21,27,.06);color:var(--ink-2)}
.who-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:3rem}

/* hỏi đáp */
.faq{display:grid;grid-template-columns:.8fr 1.2fr;gap:4rem}
details{border-top:1px solid var(--line)}
details:last-child{border-bottom:1px solid var(--line)}
summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:1.4rem 0;font-size:1.12rem;font-weight:600}
summary::-webkit-details-marker{display:none}
summary .pm{flex:none;width:2.2rem;height:2.2rem;border-radius:50%;background:rgba(18,21,27,.06);position:relative;transition:background .4s,transform .6s var(--spring)}
summary .pm::before,summary .pm::after{content:"";position:absolute;left:50%;top:50%;width:12px;height:2px;background:var(--ink);transform:translate(-50%,-50%);border-radius:2px}
summary .pm::after{transform:translate(-50%,-50%) rotate(90deg);transition:transform .6s var(--spring)}
details[open] summary .pm{background:var(--gold);transform:rotate(180deg)}
details[open] summary .pm::after{transform:translate(-50%,-50%) rotate(0)}
details .a{color:var(--ink-2);padding:0 3.5rem 1.5rem 0;max-width:46rem}

/* thư viện tài liệu */
.feat{display:grid;gap:.8rem;margin:1.8rem 0 2rem;max-width:30rem}
.feat div{display:flex;gap:1rem;align-items:center;padding:1rem 1.2rem;border-radius:1rem;background:var(--card);box-shadow:inset 0 0 0 1px var(--line)}
.feat .ico{width:2.6rem;height:2.6rem;border-radius:.7rem;display:grid;place-items:center;background:rgba(235,187,46,.16);color:var(--gold-deep);flex:none}
.feat b{display:block;font-size:15.5px}
.feat span{font-size:14px;color:var(--muted)}
.mock{position:relative;align-self:center;justify-self:center;width:min(100%,400px);margin-bottom:4.5rem}
.mock .sheet{background:var(--card);border-radius:1.2rem;padding:1.6rem;box-shadow:inset 0 0 0 1px var(--line),0 40px 60px -40px rgba(18,21,27,.5);animation:float 6s ease-in-out infinite}
.mock .ln{height:9px;border-radius:9px;background:var(--paper-2);margin-top:.8rem}
.mock .ln.g{background:var(--gold);width:55%;height:34px;border-radius:.6rem;margin-top:1.4rem}
.mock .num{display:flex;gap:.8rem;align-items:center;margin-top:1rem}
.mock .num b{width:1.5rem;height:1.5rem;border-radius:50%;background:var(--gold);display:grid;place-items:center;font-size:12px;flex:none}
.mock .num .ln{margin:0;flex:1}
.mock .tag{position:absolute;right:-1rem;top:-1rem;background:var(--ink);color:#fff;border-radius:.7rem;padding:.5rem .9rem;font-size:13px;font-weight:600}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.filters{display:flex;flex-wrap:wrap;gap:.5rem;margin:2rem 0 1rem}
.filters button{border:0;cursor:pointer;display:inline-flex;gap:.5rem;align-items:center;padding:.55rem 1rem;border-radius:999px;background:var(--card);box-shadow:inset 0 0 0 1px var(--line);font-size:14.5px;font-weight:600;transition:background .3s,color .3s}
.filters button small{font-size:12px;color:var(--muted);font-weight:500}
.filters button.cur{background:var(--ink);color:#fff}
.filters button.cur small{color:var(--gold)}
.count{font-size:14px;color:var(--muted);margin-bottom:1.4rem}
.docs{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.doc{display:flex;flex-direction:column;background:var(--card);border-radius:1.3rem;padding:1.6rem;box-shadow:inset 0 0 0 1px var(--line);transition:transform .7s var(--spring),box-shadow .5s}
.doc:hover{transform:translateY(-5px);box-shadow:inset 0 0 0 1px rgba(181,133,10,.45),0 30px 50px -40px rgba(181,133,10,.5)}
.doc[hidden]{display:none}
.doc .meta{display:flex;flex-wrap:wrap;gap:.4rem}
.doc .meta span{font-size:12px;padding:.18rem .6rem;border-radius:999px;background:rgba(18,21,27,.06);font-weight:500}
.doc .meta span.soon{background:rgba(235,187,46,.25);color:#6b4f00;font-weight:600}
.doc h3{font-family:var(--serif);font-weight:500;font-size:1.35rem;line-height:1.25;margin:1rem 0 .6rem}
.doc p{font-size:15px;color:var(--ink-2);flex:1}
.doc a{margin-top:1.2rem;font-weight:600;font-size:14.5px;color:var(--gold-deep);display:inline-flex;gap:.4rem;align-items:center}

/* nút nổi + chân trang */
.fab{position:fixed;right:18px;bottom:18px;z-index:50;display:flex;align-items:center;gap:.6rem;padding:.5rem 1.1rem .5rem .5rem;border-radius:999px;background:var(--ink);color:#fff;font-size:14.5px;font-weight:600;box-shadow:0 20px 40px -18px rgba(18,21,27,.7),inset 0 0 0 1px rgba(255,255,255,.1);transition:transform .5s var(--spring)}
.fab:hover{transform:translateY(-3px)}
.fab b{width:2.1rem;height:2.1rem;border-radius:50%;background:var(--gold);color:var(--ink);display:grid;place-items:center}
footer{padding:2.5rem 0 5.5rem;border-top:1px solid var(--line);font-size:14.5px;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1.5rem;align-items:center}
footer a{color:var(--ink);font-weight:600}
footer .brand{color:var(--ink);text-transform:none;font-size:16px}

/* hiện dần khi cuộn */
.rv{opacity:0;transform:translateY(36px);transition:opacity .9s var(--ease),transform 1.1s var(--spring)}
.rv.in{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}

@media (max-width:980px){
  .nav ul,.nav .wrap>.btn{display:none}
  .burger{display:block}
  .sys,.road,.faq,.signup,.top .wrap,.story{grid-template-columns:1fr}
  .story{gap:1.5rem}
  .road .side{position:static}
  .cards,.who-grid{grid-template-columns:1fr}
  .docs{grid-template-columns:1fr 1fr}
  .law{grid-template-columns:1fr}
  .law>div,.law>div+div{padding:1.8rem 0;border-left:0;border-bottom:1px solid rgba(255,255,255,.12)}
  .facts{grid-template-columns:1fr 1fr}
  .top .txt{padding-bottom:1rem}
  .top .ph{height:440px}
  .mock{margin:1rem auto 3.5rem}
  .side-img{min-height:380px}
  .side-img img{right:50%;transform:translateX(50%)}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .hero{padding-top:110px}
  .hero .ctas .btn{flex:1}
  .fields,.docs{grid-template-columns:1fr}
  .mod{grid-template-columns:1fr;gap:.3rem}
  details .a{padding-right:0}
  .card{padding:1.6rem}
  .term .body{min-height:450px;padding:1.2rem 1rem 1.4rem}
  .top{padding-top:110px}
  .fab span{display:none}
  .fab{padding:.5rem}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .rv,.steps li{opacity:1;transform:none}
}

/* trang bài viết */
.art-top{padding-bottom:1rem}
.art-top .txt{padding-bottom:2rem}
.kick a{border-bottom:1px solid currentColor}
.art{display:grid;grid-template-columns:260px minmax(0,1fr);gap:4rem;align-items:start}
.toc-in{position:sticky;top:96px;font-size:14.5px}
.toc b{display:block;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--gold-deep);margin-bottom:.8rem}
.toc ol{list-style:none;display:grid;gap:.1rem}
.toc a{display:flex;gap:.7rem;padding:.38rem .6rem;border-radius:.5rem;color:var(--ink-2);line-height:1.35;transition:background .3s,color .3s}
.toc a:hover{background:rgba(18,21,27,.06);color:var(--ink)}
.toc a span{font-family:var(--serif);font-style:italic;color:var(--gold-deep);flex:none;width:1.4rem}
.art-body{max-width:760px}
.art-body h2{font-family:var(--serif);font-weight:500;font-size:clamp(1.5rem,2.6vw,2rem);line-height:1.2;letter-spacing:-.02em}
.note{background:var(--card);border-radius:var(--r-xl);padding:clamp(1.4rem,3vw,2.2rem);box-shadow:inset 0 0 0 1px var(--line);margin-bottom:3rem}
.note ol{margin:1rem 0 1rem 1.2rem;display:grid;gap:.5rem}
.note p{color:var(--ink-2);margin-top:.8rem}
.pr{padding:2.6rem 0;border-top:1px solid var(--line);scroll-margin-top:84px}
.note[id]{scroll-margin-top:84px}
.pr-h{display:flex;gap:1rem;align-items:baseline}
.pr-h .n{font-family:var(--serif);font-style:italic;font-size:1.7rem;color:var(--gold-deep)}
.khi{margin:.7rem 0 1.1rem;color:var(--ink-2)}
.box{border-radius:1.1rem;background:var(--night);color:#fff;overflow:hidden;margin-top:1rem}
.box-h{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.65rem .7rem .65rem 1.1rem;border-bottom:1px solid rgba(255,255,255,.09);font-size:12.5px;letter-spacing:.06em;color:rgba(255,255,255,.6)}
.copy{border:0;cursor:pointer;border-radius:.6rem;padding:.45rem .9rem;background:var(--gold);color:var(--ink);font-size:13.5px;font-weight:600;letter-spacing:0;white-space:nowrap;transition:transform .4s var(--spring),background .3s}
.copy:active{transform:scale(.97)}
.copy.ok{background:#fff}
.box pre{padding:1.2rem 1.2rem 1.4rem;font-family:var(--mono);font-size:13.5px;line-height:1.7;white-space:pre-wrap;word-break:break-word;color:rgba(255,255,255,.9);max-height:420px;overflow:auto}
.meo{margin-top:1rem;padding-left:1rem;border-left:3px solid var(--gold);color:var(--ink-2);font-size:16px}
@media (max-width:980px){.art{grid-template-columns:1fr;gap:1.5rem}.toc-in{position:static;background:var(--card);border-radius:1.1rem;padding:1.1rem;box-shadow:inset 0 0 0 1px var(--line)}}