:root{
  --bg:#FAF8F3; --paper:#FFFFFF; --ink:#16231C; --muted:#5B6A62; --line:#E4E2DA;
  --green:#1F4D3A; --green-2:#2E6A51; --mint:#E7F0EA; --gold:#C9973A; --gold-soft:#FBF2DF; --red:#B4483B;
  --radius:18px; --shadow:0 1px 2px rgba(22,35,28,.06),0 12px 32px -12px rgba(22,35,28,.18);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif;font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--green)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--green-2)}
h1,h2,h3{line-height:1.15;margin:0;letter-spacing:-.02em}
h1{font-size:clamp(36px,5.6vw,64px);font-weight:800}
h2{font-size:clamp(28px,3.6vw,42px);font-weight:800}
h3{font-size:20px;font-weight:700}
.lead{font-size:clamp(17px,1.6vw,20px);color:var(--muted);max-width:640px}

/* nav */
.nav{position:sticky;top:0;z-index:20;background:rgba(250,248,243,.86);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid transparent;transition:border-color .2s}
.nav.scrolled{border-bottom-color:var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;color:var(--ink);font-size:17px;white-space:nowrap}
.brand-mark{width:30px;height:30px;border-radius:8px;background:var(--green);display:grid;place-items:center;color:#fff;font-size:15px}
.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{text-decoration:none;color:var(--ink);font-size:15px;padding:8px 12px;border-radius:999px}
.nav-links a:hover{background:var(--mint)}
.nav-links a.btn-primary,.nav-links a.btn-primary:hover{color:#fff;background:var(--green)}
@media(max-width:640px){.nav-links .hide-sm{display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:14px 26px;font:inherit;font-weight:700;font-size:16px;cursor:pointer;text-decoration:none;transition:transform .15s,background .15s,box-shadow .15s}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 8px 20px -8px rgba(31,77,58,.6)}
.btn-primary:hover{background:var(--green-2)}
.btn-ghost{background:transparent;color:var(--green);box-shadow:inset 0 0 0 1.5px var(--green)}
.btn-ghost:hover{background:var(--mint)}
.btn-sm{padding:9px 16px;font-size:14px;white-space:nowrap}
section,header{scroll-margin-top:64px}
.btn[disabled]{opacity:.6;cursor:wait}

/* hero */
.hero{padding:64px 0 40px;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;background:var(--gold-soft);color:#7A5410;border:1px solid #EFD9A8;border-radius:999px;padding:6px 14px;font-size:14px;font-weight:600;margin-bottom:22px}
.pill .dot{width:8px;height:8px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 4px rgba(201,151,58,.18)}
.hero h1 span{color:var(--green)}
.hero .lead{margin:20px auto 30px}
.hero-cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-shot{margin:48px auto 0;max-width:980px;border-radius:20px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line);background:#fff}
.trust{display:flex;gap:28px;justify-content:center;flex-wrap:wrap;margin-top:28px;color:var(--muted);font-size:15px}
.trust b{color:var(--ink)}

/* sections */
section{padding:72px 0}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .lead{margin:14px auto 0}

/* questions grid */
.qgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.qcard{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.qcard .img{aspect-ratio:800/466;background:#f2f1ec;border-bottom:1px solid var(--line);overflow:hidden}
.qcard .img img{width:100%;height:100%;object-fit:cover;object-position:top left}
.qcard .txt{padding:20px 22px 24px}
.qcard .q{font-weight:800;font-size:19px;margin-bottom:6px}
.qcard p{margin:0;color:var(--muted);font-size:15.5px}
.qcard .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--green);background:var(--mint);border-radius:999px;padding:3px 10px;margin-bottom:10px}
@media(max-width:760px){.qgrid{grid-template-columns:1fr}}

/* pricing */
#bang-gia{background:linear-gradient(180deg,var(--bg),#F2EFE6)}
.seats{display:flex;align-items:center;gap:14px;max-width:520px;margin:22px auto 0;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:14px 18px}
.seats .bar{flex:1;height:8px;border-radius:99px;background:#EEE9DD;overflow:hidden}
.seats .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold),#E0B45B);width:0;transition:width .8s}
.seats .num{font-weight:700;font-size:15px;white-space:nowrap}
.plans{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;align-items:stretch}
.plan{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;display:flex;flex-direction:column}
.plan.hot{border:2px solid var(--green);box-shadow:var(--shadow)}
.plan.sel{outline:3px solid rgba(201,151,58,.55);outline-offset:3px}
.badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--green);color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px;white-space:nowrap}
.plan .name{font-weight:800;font-size:22px}
.plan .for{color:var(--muted);font-size:14.5px;min-height:44px;margin:4px 0 16px}
.price{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.price .now{font-size:34px;font-weight:800;letter-spacing:-.02em}
.price .old{color:var(--muted);text-decoration:line-through;font-size:16px}
.price .off{font-size:12px;font-weight:700;color:#7A5410;background:var(--gold-soft);border-radius:6px;padding:2px 7px}
.price-note{font-size:13px;color:var(--muted);margin:2px 0 18px;min-height:20px}
.plan ul{list-style:none;padding:0;margin:0 0 22px;flex:1}
.plan li{position:relative;padding-left:26px;margin:9px 0;font-size:15px}
.plan li:before{content:"";position:absolute;left:0;top:5px;width:16px;height:16px;border-radius:50%;background:var(--mint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.2 2.2 4.8-4.8' fill='none' stroke='%231F4D3A' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.plan li.plus-prev{color:var(--muted);font-style:italic}
.plan li.plus-prev:before{background:transparent;content:"+";color:var(--muted);top:0;font-style:normal;font-weight:700}
.plan .btn{width:100%}
@media(max-width:1000px){.plans{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.plans{grid-template-columns:1fr}}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.step{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.step:before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--green);color:#fff;font-weight:800;margin-bottom:14px}
.step p{margin:6px 0 0;color:var(--muted);font-size:15.5px}
@media(max-width:760px){.steps{grid-template-columns:1fr}}

/* free */
.free{background:var(--green);color:#fff;border-radius:28px;padding:48px;display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center}
.free .lead{color:#CFE2D7}
.free .eyebrow{color:#A9D3BC}
.form{display:grid;gap:12px}
.form input{width:100%;font:inherit;font-size:16px;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--ink)}
.form input:focus{outline:3px solid rgba(201,151,58,.45);border-color:var(--gold)}
.free .btn-primary{background:var(--gold);color:#2A1D05;box-shadow:none}
.free .btn-primary:hover{background:#D9A94A}
.msg{font-size:14.5px;min-height:22px}
.free .msg{color:#E5F1EA}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
@media(max-width:820px){.free{grid-template-columns:1fr;padding:32px 22px}}

/* faq */
.faq{max-width:780px;margin:0 auto}
details{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:4px 20px;margin-bottom:10px}
summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";font-weight:400;font-size:22px;line-height:1;color:var(--green)}
details[open] summary:after{content:"–"}
details p{margin:0 0 16px;color:var(--muted)}

footer{padding:40px 0 56px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

/* modal */
.modal{position:fixed;inset:0;z-index:50;display:none;align-items:center;justify-content:center;padding:16px;background:rgba(14,24,19,.55);backdrop-filter:blur(3px)}
.modal.open{display:flex}
.sheet{background:var(--paper);border-radius:22px;max-width:440px;width:100%;padding:28px;box-shadow:0 30px 80px -20px rgba(0,0,0,.4);position:relative;animation:pop .2s ease}
@keyframes pop{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}
.close{position:absolute;top:12px;right:12px;border:0;background:#F1EFE8;width:34px;height:34px;border-radius:50%;font-size:18px;cursor:pointer}
.sum{display:flex;justify-content:space-between;align-items:center;background:var(--mint);border-radius:12px;padding:12px 16px;margin:16px 0}
.sum b{font-size:22px}
.sheet .small{font-size:13px;color:var(--muted);margin-top:10px}
.sheet .msg{color:var(--red)}

/* thank you */
.center-card{max-width:560px;margin:80px auto;background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:40px 32px;text-align:center;box-shadow:var(--shadow)}
.spinner{width:42px;height:42px;border-radius:50%;border:4px solid var(--mint);border-top-color:var(--green);margin:0 auto 18px;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.ok{width:56px;height:56px;border-radius:50%;background:var(--green);color:#fff;display:grid;place-items:center;font-size:28px;margin:0 auto 18px}