/* RMON OS – nhận diện chuẩn RMON: chữ xanh mint, mũ tốt nghiệp nâu, cam làm điểm nhấn hành động.
   Bố cục: một cột gọn 1040px, nền trắng xen dải mint rất nhạt, thẻ chỉ dùng cho khối cần tách riêng. */
:root{
  --bg:#ffffff; --band:#f1faf9; --band-warm:#fbf6f0; --surface:#ffffff; --ink:#173a37; --muted:#56706d; --line:#d9ecea;
  --mint:#4ab1bb; --mint-ink:#2a7f88; --mint-deep:#1d5e66; --mint-soft:#e4f4f6; --logo-plate:transparent;
  --brown:#391f14; --brown-soft:#f2ebe7;
  --orange:#e5802f; --orange-deep:#b85f17; --orange-soft:#fdeedd;
  --on-mint:#0c3e3a;
  --display:"Literata", Georgia, "Times New Roman", serif;
  --body:"Be Vietnam Pro", "Segoe UI", Roboto, Arial, sans-serif;
  --mono:"JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  --shadow:0 1px 2px rgba(17,133,122,.06), 0 6px 18px rgba(17,133,122,.07);
  --nav-h:78px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0f1817; --band:#132120; --band-warm:#1c1915; --surface:#172523; --ink:#e6f3f1; --muted:#a3bbb8; --line:#28403d;
  --mint:#5cc3cc; --mint-ink:#7ed2da; --mint-deep:#0f3a3f; --mint-soft:#153539; --logo-plate:#ffffff;
  --brown:#c9a28a; --brown-soft:#2b221d;
  --orange:#f2984f; --orange-deep:#f6b073; --orange-soft:#3a2816;
  --on-mint:#08302c; --shadow:0 1px 2px rgba(0,0,0,.3); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0f1817; --band:#132120; --band-warm:#1c1915; --surface:#172523; --ink:#e6f3f1; --muted:#a3bbb8; --line:#28403d;
  --mint:#5cc3cc; --mint-ink:#7ed2da; --mint-deep:#0f3a3f; --mint-soft:#153539; --logo-plate:#ffffff;
  --brown:#c9a28a; --brown-soft:#2b221d;
  --orange:#f2984f; --orange-deep:#f6b073; --orange-soft:#3a2816;
  --on-mint:#08302c; --shadow:0 1px 2px rgba(0,0,0,.3); color-scheme:dark}

*{box-sizing:border-box}
html{overflow-x:clip}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.6;margin:0;overflow-x:clip;
  padding-left:max(16px, env(safe-area-inset-left, 0px));padding-right:max(16px, env(safe-area-inset-right, 0px))}
.wrap{max-width:1040px;margin:0 auto}
[id],.q,.result,.tpl-out{scroll-margin-top:calc(var(--nav-h) + 16px)}
h1,h2,h3{font-family:var(--display);text-wrap:balance;margin:0;line-height:1.2;font-weight:700}
h1{font-size:clamp(1.9rem,4.2vw,2.7rem);letter-spacing:-.01em}
h2{font-size:clamp(1.45rem,2.8vw,1.95rem)}
h3{font-size:1.12rem}
p{margin:0}
a{color:var(--mint-ink)}
.eyebrow{font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--orange-deep);font-weight:700}
.lead{color:var(--muted);max-width:60ch;font-size:1.04rem}
.stack{display:flex;flex-direction:column;gap:12px}
.note{font-size:.86rem;color:var(--muted)}

/* dải nền tràn viền, nội dung vẫn trong .wrap */
section,.hero{position:relative;padding-block:52px}
section::before,.hero::before{content:"";position:absolute;inset:0 calc(50% - 50vw);z-index:-1;background:var(--bg)}
section:nth-of-type(odd)::before{background:var(--band)}
section.warm::before{background:var(--band-warm)}
section > h2{margin-top:6px}

/* thanh điều hướng */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top, 0px);z-index:30;background:var(--bg)}
.nav{position:sticky;top:env(safe-area-inset-top, 0px);z-index:20;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 18px;padding-block:10px;min-height:var(--nav-h)}
.nav::before{content:"";position:absolute;inset:0 calc(50% - 50vw);z-index:-1;background:var(--bg);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.logo img{height:58px;width:auto;display:block;background:var(--logo-plate);border-radius:8px;padding:2px 4px}
.logo .os{font-family:var(--mono);font-size:.74rem;font-weight:600;color:var(--bg);background:var(--brown);border-radius:5px;padding:2px 7px;align-self:center}
.nav nav{display:flex;flex-wrap:wrap;gap:2px 20px;font-size:.92rem;font-weight:500}
.nav nav a{color:var(--muted);text-decoration:none;padding-block:4px;border-bottom:2px solid transparent}
.nav nav a[aria-current="page"],.nav nav a:hover{color:var(--mint-ink);border-bottom-color:var(--mint)}

/* nút */
.cta-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;padding:11px 18px;font:600 .95rem var(--body);
  border:2px solid var(--mint);background:var(--mint);color:var(--on-mint);cursor:pointer;text-decoration:none}
.btn:hover{border-color:var(--mint-ink)}
.btn.cta{background:var(--orange);border-color:var(--orange);color:#fff}
.btn.ghost,.btn.light{background:transparent;color:var(--mint-ink);border-color:var(--mint)}
.btn.small{padding:7px 13px;font-size:.86rem;border-radius:9px}
.btn:focus-visible,a:focus-visible,button:focus-visible{outline:3px solid var(--orange);outline-offset:2px}

/* hero: nền mint nhạt, chữ đậm */
.hero{display:grid;grid-template-columns:1.25fr .9fr;gap:40px;align-items:center;padding-block:44px 48px}
.hero::before{background:linear-gradient(180deg,var(--mint-soft),var(--band))}
.hero .stack{gap:16px}
.hero.simple{grid-template-columns:1fr;padding-block:36px 40px}
.trust{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.86rem;color:var(--muted)}
.trust b{color:var(--ink)}
.share{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:.88rem;color:var(--muted)}

/* bảng minh hoạ trong hero */
.panel{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:16px;padding:16px;font-size:.88rem;box-shadow:var(--shadow)}
.panel .bar{display:flex;gap:6px;margin-bottom:8px;align-items:center}
.panel .bar i{width:9px;height:9px;border-radius:50%;background:var(--line)}
.panel .bar span{margin-left:auto;font-family:var(--mono);font-size:.7rem;color:var(--muted)}
.panel .row{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;padding:9px 10px;border-radius:10px;margin-top:6px;background:var(--band)}
.panel .k{font-family:var(--mono);font-size:.72rem;font-weight:600;color:#fff;border-radius:6px;padding:2px 6px;align-self:start;margin-top:2px}
.k.p1{background:var(--mint-ink)} .k.p2{background:var(--brown)} .k.p3{background:var(--orange-deep)} .k.p4{background:var(--mint-deep)}
.panel .ok,.panel .warn{font-size:.72rem;font-weight:700;border-radius:999px;padding:1px 9px}
.panel .ok{color:var(--mint-ink);background:var(--mint-soft)}
.panel .warn{color:var(--orange-deep);background:var(--orange-soft)}

/* 4 trụ */
.pillars{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:24px}
.pillar{--c:var(--mint-ink);background:var(--surface);border-radius:14px;display:flex;flex-direction:column;min-width:0;border:1px solid var(--line)}
.pillar.p2{--c:var(--brown)} .pillar.p3{--c:var(--orange-deep)} .pillar.p4{--c:var(--mint-deep)}
.pillar header{display:flex;align-items:baseline;gap:12px;padding:16px 18px 0}
.pillar header .k{font-family:var(--mono);font-size:.8rem;font-weight:600;color:var(--c)}
.pillar header h3{font-size:1.2rem;color:var(--c)}
.pillar .body{padding:8px 18px 16px;display:flex;flex-direction:column;gap:10px;flex:1}
.pillar .body > p{color:var(--muted);font-size:.94rem}
.items{display:grid;grid-template-columns:1fr auto;gap:0;font-size:.92rem}
.items span{padding-block:8px;border-top:1px solid var(--line)}
.items span:nth-child(-n+2){border-top:0}
.items span:nth-child(even){padding-left:14px;font-variant-numeric:tabular-nums;font-weight:700;color:var(--ink);text-align:right;white-space:nowrap}
.items small{display:block;color:var(--muted);font-size:.8rem;line-height:1.45}

/* cách bắt đầu */
.paths{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px;align-items:stretch}
.path{border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:10px;background:var(--surface)}
.path .price{font-family:var(--display);font-size:1.6rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--mint-ink)}
.path .price small{font-family:var(--body);font-size:.82rem;font-weight:500;color:var(--muted)}
.path ul{margin:0;padding-left:18px;color:var(--muted);font-size:.93rem}
.path li{margin-block:3px}
.path .btn{margin-top:auto}
.path.feature{border:2px solid var(--mint);background:var(--mint-soft)}
.tag{align-self:flex-start;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:var(--orange);border-radius:999px;padding:3px 10px}

/* thẻ công cụ */
.tool-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:8px}
.tool-card{--c:var(--mint-ink);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--ink)}
.tool-card.p2{--c:var(--brown)} .tool-card.p3{--c:var(--orange-deep)} .tool-card.p4{--c:var(--mint-deep)}
.tool-card .eyebrow{color:var(--c)}
.tool-card:hover{border-color:var(--mint)}
.tool-card p{color:var(--muted);font-size:.94rem}
.tool-card .go{margin-top:auto;align-self:flex-start;color:var(--c);font-weight:700;font-size:.92rem}
.tool-card .go::after{content:" →"}
.tool-card.wide{grid-column:1 / -1;background:var(--mint-soft)}

/* các bước */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px;counter-reset:s;padding:0;list-style:none}
.steps li{counter-increment:s;display:flex;flex-direction:column;gap:6px;border-top:3px solid var(--mint);padding-top:12px}
.steps li::before{content:counter(s);font-family:var(--mono);font-weight:600;color:var(--mint-ink);font-size:.85rem}
.steps li p{color:var(--muted);font-size:.93rem}
.steps.three{grid-template-columns:repeat(3,1fr)}

/* bảng so sánh */
.table-wrap{overflow-x:auto;margin-top:24px;border-radius:14px;border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;min-width:560px;background:var(--surface)}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top;font-size:.94rem}
thead th{font-family:var(--display);font-size:1.08rem;background:var(--band)}
thead th.hl{background:var(--mint);color:var(--on-mint)}
td.hl{background:var(--mint-soft);font-weight:500}
td:first-child{color:var(--muted);width:38%}
.yes{color:var(--mint-ink);font-weight:700}
.no{color:var(--muted)}

/* về rmon */
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}
.fact{border-left:3px solid var(--mint);padding:4px 0 4px 14px}
.fact b{font-family:var(--display);font-size:1.7rem;display:block;color:var(--mint-ink);line-height:1.15}
.fact span{font-size:.9rem;color:var(--muted)}

/* hỏi đáp */
.faq{margin-top:20px;display:flex;flex-direction:column;gap:8px}
details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 16px}
summary{cursor:pointer;font-weight:600}
details[open] summary{color:var(--mint-ink)}
details p{color:var(--muted);margin-top:6px;max-width:68ch}

/* liên hệ */
.contact{position:relative;padding-block:44px;display:grid;grid-template-columns:1.2fr 1fr;gap:28px;align-items:center}
.contact::before{content:"";position:absolute;inset:0 calc(50% - 50vw);z-index:-1;background:var(--mint-soft)}
.contact p{color:var(--muted)}
.contact .box{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:8px}
.contact .box > span:first-child{font-weight:700;font-size:.85rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.zalo-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding:8px 10px;border-radius:10px;background:var(--band)}
.contact .phone{font-size:1.2rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--ink);user-select:all}
.contact .msg{font-size:.82rem;min-height:1em;color:var(--mint-ink)}
footer{font-size:.82rem;color:var(--muted);padding-block:20px 28px;display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between;line-height:1.7}
footer .addr{text-align:right}

/* công cụ tương tác */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:18px}
.tool h3{color:var(--mint-ink)}
.q{display:flex;flex-direction:column;gap:10px;padding:14px;border-radius:12px;border:1px solid transparent;transition:background .2s,border-color .2s}
.q.answered{background:var(--band)}
.q.next{border-color:var(--mint)}
.q legend{font-weight:600;padding:0;font-size:1rem;float:left;width:100%;margin-bottom:10px}
.q legend + *{clear:both}
.q .num{display:inline-grid;place-items:center;min-width:28px;height:22px;border-radius:6px;background:var(--mint-soft);color:var(--mint-ink);font-family:var(--mono);font-size:.78rem;font-weight:600;margin-right:8px}
fieldset{border:0;margin:0;min-width:0}
.opts,.tpl-list{display:flex;flex-wrap:wrap;gap:8px}
.opt{position:relative}
.opt input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.opt span{display:inline-block;border:1.5px solid var(--line);border-radius:999px;padding:7px 14px;font-size:.9rem;background:var(--surface);cursor:pointer}
.opt:hover span{border-color:var(--mint)}
.opt input:checked + span{border-color:var(--mint);background:var(--mint);color:var(--on-mint);font-weight:600}
.opt input:focus-visible + span{outline:3px solid var(--orange);outline-offset:2px}
.fields{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.field{display:flex;flex-direction:column;gap:5px;min-width:0}
.field label{font-weight:600;font-size:.9rem}
.field small{color:var(--muted);font-size:.78rem}
.field input,.field select,.field textarea{font:inherit;font-variant-numeric:tabular-nums;padding:9px 12px;border:1.5px solid var(--line);border-radius:9px;background:var(--bg);color:var(--ink);width:100%}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--mint);box-shadow:0 0 0 3px var(--mint-soft)}
.result{border-radius:12px;padding:18px;background:var(--mint-soft);border:1px solid var(--mint);display:flex;flex-direction:column;gap:10px}
.result.warn{background:var(--orange-soft);border-color:var(--orange)}
.result .big{font-family:var(--display);font-size:1.9rem;font-weight:700;line-height:1.15;font-variant-numeric:tabular-nums}
.result ul{margin:0;padding-left:18px}
.result li{margin-block:3px}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.kpi{background:var(--surface);border-radius:10px;padding:10px 12px}
.kpi span{font-size:.8rem;color:var(--muted);display:block}
.kpi b{font-family:var(--display);font-size:1.25rem;font-variant-numeric:tabular-nums}
.meter{height:12px;border-radius:999px;background:var(--line);overflow:hidden;position:relative}
.meter i{position:absolute;inset:0 auto 0 0;background:var(--mint-ink);border-radius:999px}
.meter.warn i{background:var(--orange)}
.check-group{display:flex;flex-direction:column;gap:2px;background:var(--band);border-radius:12px;padding:14px 16px}
.check-group h3{margin-bottom:4px}
.check{display:flex;gap:10px;align-items:flex-start;padding:5px 0;cursor:pointer}
.check input{width:19px;height:19px;margin-top:3px;accent-color:var(--mint-ink);flex:none}
.check input:checked + span{color:var(--muted);text-decoration:line-through}
.months{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}
.months button{font:600 .92rem var(--body);border:1.5px solid var(--line);background:var(--surface);color:var(--ink);border-radius:9px;padding:8px 0;cursor:pointer;font-variant-numeric:tabular-nums}
.months button[aria-pressed="true"]{background:var(--mint);color:var(--on-mint);border-color:var(--mint)}
.months button.now{border-color:var(--orange)}
.tpl-out{white-space:pre-wrap;background:var(--band);border:1px solid var(--line);border-left:4px solid var(--mint);border-radius:10px;padding:16px;font-size:.98rem;line-height:1.7}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.disclaimer{font-size:.8rem;color:var(--muted)}
.tool-section{padding-top:28px}
.save-bar{margin-top:2px}

/* thanh kết quả nổi (hiện khi kết quả nằm ngoài màn hình) */
.peek{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(14px + env(safe-area-inset-bottom, 0px));z-index:25;display:flex;align-items:center;gap:12px;
  background:var(--ink);color:var(--bg);border:0;border-radius:999px;padding:10px 12px 10px 18px;font:600 .92rem var(--body);box-shadow:0 8px 24px rgba(0,0,0,.2);cursor:pointer;max-width:calc(100% - 32px)}
.peek b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.peek span{background:var(--mint);color:var(--on-mint);border-radius:999px;padding:4px 10px;font-size:.82rem;white-space:nowrap}

/* thanh toán */
.pay{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;align-items:start}
.pay-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:14px}
.pay .qr-box{position:sticky;top:calc(var(--nav-h) + 16px + env(safe-area-inset-top, 0px))}
.pick{display:flex;flex-direction:column;gap:6px}
.pick label{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;border:1.5px solid var(--line);border-radius:10px;padding:9px 12px;cursor:pointer;font-size:.94rem}
.pick label:has(input:checked){border-color:var(--mint);background:var(--mint-soft)}
.pick input{accent-color:var(--mint-ink);width:18px;height:18px}
.pick b{font-variant-numeric:tabular-nums;white-space:nowrap}
.qr-box{display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}
.qr-box canvas,.qr-box img{width:220px;max-width:100%;height:auto;background:#fff;padding:10px;border-radius:12px;border:1px solid var(--line)}
.bank-info{width:100%;display:grid;grid-template-columns:auto 1fr;gap:5px 12px;text-align:left;font-size:.93rem}
.bank-info span{color:var(--muted)}
.bank-info b{font-variant-numeric:tabular-nums;word-break:break-word}
.pending{background:var(--orange-soft);border-radius:10px;padding:12px;font-size:.88rem}

@media (max-width:860px){
  :root{--nav-h:104px}
  .hero,.contact,.pay{grid-template-columns:1fr}
  .pay .qr-box{position:static}
  .pillars,.paths,.tool-cards{grid-template-columns:1fr}
  .steps,.steps.three{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:1fr}
  .fields,.kpis{grid-template-columns:1fr}
  section,.hero,.contact{padding-block:36px}
  .hero.simple{padding-block:28px}
  .months{grid-template-columns:repeat(4,1fr)}
  footer .addr{text-align:left}
  .nav{padding-block:8px}
  .nav nav{width:100%;flex-wrap:nowrap;overflow-x:auto;gap:16px;font-size:.86rem;white-space:nowrap;scrollbar-width:none}
  .nav nav::-webkit-scrollbar{display:none}
  :root{--nav-h:96px}
  .logo img{height:50px}
}
@media (max-width:480px){
  .steps,.steps.three{grid-template-columns:1fr}
  table{min-width:0;font-size:.85rem}
  th,td{padding:9px 8px}
  .tool,.pay-card{padding:12px}
  .q{padding:10px}
  .nav nav{font-size:.82rem}
}
@media (prefers-reduced-motion:no-preference){.btn{transition:transform .15s}.btn:hover{transform:translateY(-1px)}}