:root{
  /* Bảng màu thương hiệu Longan Mortgage (lấy từ logo) — xem BRAND.md */
  --red:#CD1F31;--red-dark:#A8172A;--red-soft:#FBE9EB;
  --brown:#422815;--brown-muted:#7A6552;
  --gold:#DF9C33;--gold-dark:#B37717;--peach:#FDD7A9;
  --cream:#FFF9F1;--line:#F0E2CF;--charcoal:#363636;--white:#FFFFFF;
  /* Vai trò trong giao diện */
  --bg:var(--cream);--fg:var(--brown);--card:var(--white);--muted:var(--brown-muted);
  --brand:var(--red);--brand-dark:var(--red-dark);--accent:var(--gold);--danger:#B3261E
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.5;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:inherit}
h1,h2,h3{line-height:1.25;margin:0 0 .5rem}
p{margin:0 0 .75rem}
.container{max-width:64rem;margin:0 auto;padding:0 1rem}
.narrow{max-width:32rem}.mid{max-width:48rem}
.muted{color:var(--muted)}.sm-text{font-size:.8125rem}.center{text-align:center}
.brand-c{color:var(--brand)}
.mt{margin-top:1rem}.mt2{margin-top:2rem}.mb{margin-bottom:1rem}.mb2{margin-bottom:2rem}
.stack>*+*{margin-top:1rem}
.row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}
.grid{display:grid;gap:1rem}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}
@media(max-width:700px){.g2,.g3{grid-template-columns:1fr}}

/* Header */
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,249,241,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding-top:.75rem;padding-bottom:.75rem}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:700;color:var(--brown);text-decoration:none;letter-spacing:.02em;text-transform:uppercase;font-size:.9rem}
.logo{display:block;height:2.25rem;width:auto}
nav{display:flex;align-items:center;gap:.25rem;flex-wrap:wrap;justify-content:flex-end;font-size:.875rem;font-weight:500}
nav>a{padding:.25rem .5rem;border-radius:.375rem;text-decoration:none}
nav>a:hover{background:rgba(240,226,207,.6)}
nav>a.btn{color:#fff}
form.inline{display:inline;margin:0}
@media(max-width:560px){.brand-name{display:none}}

/* Buttons & forms */
.btn,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;border-radius:.5rem;padding:.5rem 1rem;font:inherit;font-size:.875rem;font-weight:600;cursor:pointer;text-decoration:none;border:1px solid transparent;transition:background .15s}
.btn{background:var(--brand);color:#fff}.btn:hover{background:var(--brand-dark)}
.btn-ghost{background:var(--card);border-color:var(--line);color:var(--fg)}.btn-ghost:hover{background:rgba(240,226,207,.5)}
.btn.sm,.btn-ghost.sm{padding:.3rem .75rem}
.btn.legal{padding:.8rem 1.5rem;font-size:1rem}
.btn.block{display:flex;width:100%}
.danger{color:var(--danger)}
.linkbtn{background:none;border:0;padding:0;font:inherit;color:inherit;cursor:pointer}.linkbtn:hover{color:var(--danger)}
label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.25rem}
input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{width:100%;max-width:100%;box-sizing:border-box;border:1px solid var(--line);border-radius:.5rem;background:#fff;padding:.5rem .75rem;font:inherit;font-size:.875rem;color:var(--fg)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(205,31,49,.18)}
.hint{font-size:.75rem;color:var(--muted);margin-top:.25rem}
.prefix{position:relative}.prefix span{position:absolute;left:.75rem;top:.5rem;font-size:.875rem;color:var(--muted)}.prefix input{padding-left:1.5rem}

/* Cards & notices */
.card{background:var(--card);border:1px solid var(--line);border-radius:.75rem;padding:1.25rem;box-shadow:0 1px 2px rgba(0,0,0,.04)}
a.card{display:block;text-decoration:none;transition:border-color .15s}a.card:hover{border-color:rgba(205,31,49,.4)}
.card.tight{padding:1rem}
.card.hl{background:var(--brand);color:#fff;border-color:var(--brand)}
.notice{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem;border-radius:.625rem;padding:.75rem 1rem;font-size:.875rem;line-height:1.5;background:rgba(223,156,51,.15);margin:1rem 0 0}
.notice.success{background:rgba(31,140,80,.1);color:#17663b}
.notice .x{flex:0 0 auto;background:none;border:0;padding:0 .25rem;font-size:1.25rem;line-height:1;color:inherit;opacity:.55;cursor:pointer}.notice .x:hover{opacity:1}
.notice.error{background:rgba(192,57,43,.12);color:var(--danger)}
.pill{display:inline-block;border-radius:.25rem;background:var(--line);padding:.05rem .5rem;font-size:.75rem}
.pill.pin{background:rgba(223,156,51,.25);color:var(--brand);font-weight:600}

/* Landing */
.hero{padding:4rem 0 3rem;text-align:center}
.hero-logo{display:block;height:5.5rem;width:auto;margin:0 auto 1.25rem}
.hero h1{font-size:clamp(1.9rem,5vw,3rem);max-width:46rem;margin:.75rem auto}
.hero .lead{font-size:1.125rem;color:var(--muted);max-width:40rem;margin:0 auto 2rem}
.tag{display:inline-block;border-radius:999px;background:rgba(223,156,51,.18);color:var(--brand);padding:.25rem .75rem;font-size:.75rem;font-weight:600}
.pricing{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:3.5rem 0;margin-top:3rem}
.price{font-size:3rem;font-weight:700;color:var(--brand)}.price small{font-size:1.125rem;font-weight:500;color:var(--muted)}
.checks{list-style:none;padding:0;margin:1.5rem auto;max-width:20rem;text-align:left;font-size:.875rem}
.checks li{margin-bottom:.5rem}.checks li:before{content:"✓ ";color:var(--brand);font-weight:700}

/* Community */
.layout{display:grid;grid-template-columns:200px 1fr;gap:1.5rem;padding:2rem 0}
@media(max-width:760px){.layout{grid-template-columns:1fr}}
.side a{display:block;border-radius:.5rem;padding:.5rem .75rem;font-size:.875rem;text-decoration:none}
.side a:hover{background:rgba(240,226,207,.6)}.side a.on{background:var(--brand);color:#fff}
details.card summary{cursor:pointer;font-weight:600;color:var(--brand);font-size:.875rem}
.post-body{white-space:pre-wrap;word-wrap:break-word}
.clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* Courses */
.bar{height:.5rem;border-radius:999px;background:var(--line);overflow:hidden}.bar>div{height:100%;background:var(--brand)}
.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}

/* Calculator */
.result-price{font-size:2.5rem;font-weight:700;margin:.25rem 0}
.kv{list-style:none;margin:0;padding:0;font-size:.875rem}
.kv li{display:flex;justify-content:space-between;padding:.35rem 0}
.kv li.total{border-top:1px solid var(--line);margin-top:.35rem;padding-top:.6rem;font-weight:600}
.scn{border:1px solid var(--line);border-radius:.5rem;padding:.75rem;text-align:center}
.scn b{display:block;color:var(--brand);margin-top:.25rem}
.stat{font-size:2rem;font-weight:700}

/* Footer */
.site-footer{border-top:1px solid var(--line);background:var(--card);padding:2.5rem 0 1.5rem;font-size:.8125rem;line-height:1.7;color:var(--muted)}
.sf-wrap{max-width:70rem}
.sf-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.3fr;gap:2rem;align-items:start}
.sf-col{display:flex;flex-direction:column;align-items:flex-start;gap:.35rem;font-size:.8125rem;font-weight:400;justify-content:flex-start;flex-wrap:nowrap}
.sf-col p{margin:0}
.sf-col h2{font-size:.6875rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--fg);margin:0 0 .45rem}
.site-footer a{color:var(--muted);text-decoration:none;padding:0;font-size:.8125rem;font-weight:400;overflow-wrap:anywhere}.site-footer a:hover{color:var(--brand);text-decoration:underline;background:none}
.sf-logo{display:inline-flex;align-items:center;gap:.6rem;font-weight:700;color:var(--fg)!important;font-size:.875rem!important;letter-spacing:.02em;text-transform:uppercase;margin-bottom:.4rem}.sf-logo img{height:2rem;width:auto}
.sf-bottom{margin:2rem 0 0;padding-top:1.1rem;border-top:1px solid var(--line);font-size:.75rem;line-height:1.6}
@media(max-width:900px){.sf-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.75rem 1.5rem}}
@media(max-width:480px){.sf-grid{grid-template-columns:minmax(0,1fr)}}

/* Trang bán & sản phẩm */
.sales-layout{display:grid;grid-template-columns:1fr 320px;gap:1.5rem;align-items:start;margin-top:1rem}
@media(max-width:860px){.sales-layout{grid-template-columns:1fr}.buy-card{order:-1}}
.buy-card{position:sticky;top:5rem}
.lead-sm{font-size:1.0625rem;color:var(--muted)}
.outline{margin:.5rem 0 0;padding-left:1.25rem;font-size:.9375rem}.outline li{padding:.3rem 0;border-bottom:1px solid var(--line)}.outline li:last-child{border:0}
.pill.ok{background:rgba(31,140,80,.14);color:#17663b;font-weight:600}
.tbl{width:100%;border-collapse:collapse;font-size:.875rem}.tbl th{text-align:left;color:var(--muted);font-weight:500;padding:.4rem .5rem;border-bottom:1px solid var(--line)}.tbl td{padding:.5rem;border-bottom:1px solid var(--line);vertical-align:top}.tbl tr:last-child td{border:0}

/* Trang học */
.crumbs{display:flex;align-items:center;gap:.5rem;font-size:.8125rem;color:var(--muted);margin-bottom:.75rem}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--brand)}
.crumbs .sep{opacity:.5}.crumbs span:last-child{color:var(--fg);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.c-head{display:flex;align-items:center;justify-content:space-between;gap:.75rem 1.5rem;flex-wrap:wrap;margin-bottom:1.25rem}
.c-head h1{font-size:1.5rem;margin:0}
.prog{display:flex;align-items:center;gap:.75rem;font-size:.8125rem;color:var(--muted);white-space:nowrap}
.prog .bar{width:9rem;height:.375rem}
.player{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:1.75rem;align-items:start}
@media(max-width:900px){.player{grid-template-columns:1fr}}
.l-title{display:flex;align-items:center;justify-content:space-between;gap:.75rem 1rem;flex-wrap:wrap;margin:1rem 0 .75rem}
.l-title h2{font-size:1.125rem;margin:0}
.btn-ghost .ck{display:inline-block;width:.95rem;height:.95rem;border:1.5px solid var(--muted);border-radius:50%;margin-right:.5rem;position:relative;flex:0 0 auto}
.btn-ghost.done{color:var(--brand);border-color:rgba(205,31,49,.35)}
.btn-ghost.done .ck{background:var(--brand);border-color:var(--brand)}
.btn-ghost.done .ck::after{content:"";position:absolute;left:.27rem;top:.1rem;width:.25rem;height:.45rem;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}
.notes{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.1rem;font-size:.875rem;line-height:1.65;margin-bottom:.75rem}
.lnav{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-top:1rem}.lnav form{margin:0}
.panel{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.panel h3{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:1rem 1.1rem .4rem;margin:0}
.ls{list-style:none;margin:0;padding:.25rem .5rem .6rem}
.ls a{display:flex;gap:.7rem;align-items:flex-start;padding:.65rem .6rem;border-radius:10px;border-left:3px solid transparent;text-decoration:none;font-size:.875rem;line-height:1.45}
.ls a:hover{background:rgba(240,226,207,.45)}
.ls a.on{background:var(--bg);border-left-color:var(--brand);font-weight:600}
.dot{flex:0 0 1.15rem;height:1.15rem;margin-top:.1rem;border:1.5px solid #D9C9B2;border-radius:50%;position:relative}
.dot.cur{border-color:var(--brand)}.dot.cur::after{content:"";position:absolute;inset:.22rem;border-radius:50%;background:var(--brand)}
.dot.done{background:var(--brand);border-color:var(--brand)}
.dot.done::after{content:"";position:absolute;left:.33rem;top:.14rem;width:.28rem;height:.5rem;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}
.ls .lt{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* Danh sách "Bạn sẽ học được" */
.hl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.6rem 1.5rem;list-style:none;margin:0;padding:0}
@media(max-width:700px){.hl{grid-template-columns:1fr}}
.hl li{display:flex;gap:.6rem;font-size:.9rem;line-height:1.5}
.hl li .ic{flex:0 0 auto;color:var(--red);margin-top:.1rem}

/* Avatar tròn chữ cái đầu (dùng ở admin và khung học viên) */
.av{display:inline-grid;place-items:center;border-radius:50%;color:#fff;font-weight:700;line-height:1;flex:0 0 auto;user-select:none}
textarea{resize:vertical}

/* Văn bản giới thiệu đã định dạng (format_rich) */
.rich{font-size:.9375rem;line-height:1.75}
.rich p{margin:0 0 1rem}.rich>*:last-child{margin-bottom:0}
.rich h3{font-size:1.0625rem;margin:1.6rem 0 .6rem;padding-left:.7rem;border-left:3px solid var(--brand);line-height:1.3}
.rich>h3:first-child{margin-top:0}
.rich ul{margin:0 0 1rem;padding:0;list-style:none;display:flex;flex-direction:column;gap:.55rem}
.rich li{position:relative;padding-left:1.4rem}
.rich li::before{content:"";position:absolute;left:.15rem;top:.62em;width:.5rem;height:.5rem;border-radius:50%;background:var(--brand);opacity:.85}
.rich strong{font-weight:600}

/* Menu điện thoại của header công khai */
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:2.5rem;height:2.5rem;padding:0 .6rem;background:#fff;border:1px solid var(--line);border-radius:10px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--fg);border-radius:2px;transition:transform .15s,opacity .15s}
.nav-toggle.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}.nav-toggle.on span:nth-child(2){opacity:0}.nav-toggle.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(max-width:720px){
  .nav{flex-wrap:wrap}
  .nav-toggle{display:flex;margin-left:auto}
  .nav>nav{display:none;width:100%;flex-direction:column;align-items:stretch;gap:.15rem;padding:.5rem 0 .25rem;border-top:1px solid var(--line);margin-top:.5rem}
  .nav>nav.open{display:flex}
  .nav>nav>a{padding:.7rem .5rem;font-size:1rem}
  .nav>nav>a.btn{text-align:center;margin-top:.35rem;padding:.7rem 1rem}
  .nav>nav form.inline,.nav>nav .btn-ghost{width:100%}
  .brand-name{display:inline}
}

/* Trang pháp lý */
.legal{background:linear-gradient(180deg,#FDEFD9 0,var(--bg) 20rem);padding:2.5rem 1rem 4rem}
.legal-card{max-width:46rem;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:20px;padding:2.25rem 2.25rem 1.75rem;box-shadow:0 14px 36px -18px rgba(66,40,21,.18)}
.legal-card h1{font-size:1.9rem;letter-spacing:-.01em;margin:0 0 .35rem}
.legal-upd{font-size:.8125rem;color:var(--muted);margin:0 0 1.5rem}
.legal-card h2{font-size:1.125rem;margin:1.9rem 0 .6rem;padding-left:.7rem;border-left:3px solid var(--brand);line-height:1.3}
.legal-card p,.legal-card li{font-size:.9375rem;line-height:1.75}
.legal-card p{margin:0 0 .9rem}
.legal-card ul{margin:0 0 1rem;padding-left:1.25rem;display:flex;flex-direction:column;gap:.45rem}
.legal-card a{color:var(--brand);font-weight:600}
.legal-key{background:var(--red-soft);border-radius:14px;padding:1rem 1.15rem;font-size:.9375rem;line-height:1.7;margin:0 0 .5rem}
.legal-contact{margin-top:2rem;padding-top:1.25rem;border-top:1px solid var(--line);font-size:.8125rem;color:var(--muted);line-height:1.7}
@media(max-width:560px){.legal{padding:1.25rem .75rem 3rem}.legal-card{padding:1.5rem 1.15rem}.legal-card h1{font-size:1.5rem}}


/* Phản hồi học viên (testimonials) */
.tm-vids{display:flex;flex-wrap:wrap;gap:1rem;align-items:flex-start;margin:0 0 1rem}
.tm-vid{flex:1 1 20rem;min-width:0}.tm-vid.tm-portrait{flex:0 1 14rem}
.tm-vid{margin:0;display:flex;flex-direction:column;gap:.55rem}
.tm-frame{position:relative;aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:#2E1B0E center/cover no-repeat}
.tm-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.tm-play{position:absolute;inset:0;width:100%;height:100%;border:0;padding:0;cursor:pointer;color:#fff;background:transparent}
.tm-play:hover .tm-play-ic{transform:scale(1.08)}
.tm-play-ic{position:absolute;top:50%;left:50%;margin:-1.6rem 0 0 -1.6rem;width:3.2rem;height:3.2rem;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px -6px rgba(0,0,0,.5);transition:transform .15s}
.tm-vid figcaption{display:flex;flex-direction:column;line-height:1.4;font-size:.875rem}.tm-vid figcaption small{color:var(--muted);font-size:.75rem}
.tm-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
.tm-q{margin:0;display:flex;flex-direction:column;justify-content:space-between;gap:1rem;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:1.25rem 1.3rem;position:relative}
.tm-q::before{content:"\201C";position:absolute;top:.35rem;left:1rem;font-size:3rem;line-height:1;color:var(--brand);opacity:.25;font-family:Georgia,serif}
.tm-q blockquote{margin:0;padding-top:.9rem}.tm-q p{margin:0;font-size:.9375rem;line-height:1.7}
.tm-q figcaption{display:flex;flex-direction:column;line-height:1.35;font-size:.875rem;border-top:1px solid var(--line);padding-top:.75rem}.tm-q figcaption small{color:var(--muted);font-size:.75rem}
.tm-note{margin:1rem 0 0;font-size:.75rem;line-height:1.6;color:var(--muted)}
@media(max-width:700px){.tm-grid{grid-template-columns:minmax(0,1fr)}.tm-vid.tm-portrait{flex:1 1 100%;max-width:20rem;margin:0 auto}}
.tm-more{margin:1rem 0 0;text-align:center}.tm-q[hidden]{display:none}
.tm-play:focus-visible{outline:3px solid var(--brand);outline-offset:-3px}