:root{--b50:#eff6ff;--b100:#dbeafe;--b200:#bfdbfe;--b500:#3b82f6;--b600:#2563eb;--b700:#1d4ed8;--ink:#0f2a5f;--mut:#475569;--line:#dbe5f5}
*{box-sizing:border-box}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:linear-gradient(180deg,#e8f1ff 0,#fff 380px)}
img{max-width:100%;height:auto}
.wrap{max-width:980px;margin:0 auto;padding:0 18px}
.top{background:rgba(255,255,255,.85);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.bar{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{font-weight:800;color:var(--b700);text-decoration:none;font-size:18px}
nav a{margin-left:16px;color:var(--ink);text-decoration:none;font-weight:600;font-size:14px}
nav a.lang{border:1px solid var(--b200);border-radius:8px;padding:3px 8px;color:var(--b700)}
.hero{padding:54px 0 30px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:0 0 14px;color:var(--b700)}
.hero p{max-width:640px;margin:0 auto 22px;color:var(--mut);font-size:18px}
.btn{display:inline-block;border:0;border-radius:12px;padding:12px 22px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;background:var(--b600);color:#fff}
.btn:hover{background:var(--b700)}
.btn.ghost{background:var(--b100);color:var(--b700)}
.btn.dis{background:#cbd5e1;color:#475569;cursor:default}
h2{margin:38px 0 14px;color:var(--b700);font-size:24px}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:0 6px 18px rgba(37,99,235,.07)}
.card h3{margin:0 0 6px;font-size:17px}
.card p{margin:0;color:var(--mut);font-size:15px}
table.cmp{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.cmp th,.cmp td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;font-size:15px}
.cmp th{background:var(--b50);color:var(--b700)}
.cmp td.c{text-align:center;white-space:nowrap}
.plans .card{text-align:center}
.plans .price{font-size:26px;font-weight:800;color:var(--b700);margin:6px 0}
.plans .usd{color:var(--mut);font-size:14px;margin-bottom:12px}
.hint{color:var(--mut);font-size:14px}
form.box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;max-width:520px;margin:24px auto}
label{display:block;margin:12px 0 4px;font-weight:600}
input[type=email],input[type=text],input[type=password],select{width:100%;padding:11px 12px;border:1px solid var(--b200);border-radius:10px;font:inherit}
.opt{display:flex;gap:8px;align-items:center;font-weight:500;margin:6px 0}
.opt input{width:auto}
.err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b;padding:10px 12px;border-radius:10px;margin:10px 0}
.okb{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534;padding:10px 12px;border-radius:10px;margin:10px 0}
.kv{display:grid;grid-template-columns:150px 1fr;gap:6px 12px;margin:12px 0}
.kv b{color:var(--mut);font-weight:600}
.code{font-family:ui-monospace,Consolas,monospace;font-weight:800;background:var(--b50);border:1px solid var(--b200);border-radius:8px;padding:2px 8px}
.qr{text-align:center;margin:12px 0}.qr img{max-width:300px;width:100%;border:1px solid var(--line);border-radius:12px}
.st{display:inline-block;padding:2px 10px;border-radius:99px;font-size:13px;font-weight:700;background:var(--b100);color:var(--b700)}
.st.sent,.st.paid{background:#dcfce7;color:#166534}.st.expired,.st.cancelled,.st.refunded{background:#fee2e2;color:#991b1b}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px;margin:8px 0}
summary{cursor:pointer;font-weight:700}
.foot{margin-top:60px;border-top:1px solid var(--line);padding:20px 0;color:var(--mut);font-size:14px;text-align:center}
.doc h2{font-size:20px}.doc p,.doc li{color:#1e3a6e}
/* admin */
.adm table{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
.adm th,.adm td{padding:7px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.adm th{background:var(--b50)}
.adm form{display:inline}.adm button{padding:4px 9px;border-radius:8px;border:1px solid var(--b200);background:var(--b50);cursor:pointer;font:inherit;font-size:13px}
.adm button.go{background:var(--b600);color:#fff;border-color:var(--b600)}.adm button.bad{background:#fef2f2;border-color:#fecaca;color:#991b1b}
.tabs a{display:inline-block;margin:0 6px 10px 0;padding:6px 14px;border-radius:99px;background:var(--b100);color:var(--b700);text-decoration:none;font-weight:700}
.tabs a.on{background:var(--b600);color:#fff}
@media(max-width:600px){.kv{grid-template-columns:1fr}}

/* landing: xanh -> trắng, khoảng 75% nền trắng */
main.land{padding:0}body:has(main.land){background:#fff}
.hero{background:linear-gradient(180deg,#2563eb 0,#60a5fa 38%,#dbeafe 72%,#fff 100%);padding:56px 0 70px;text-align:left}
.hero-in{display:grid;gap:34px;align-items:center;grid-template-columns:1fr}
.hero .badge{display:inline-block;background:rgba(255,255,255,.9);color:var(--b700);font-weight:700;font-size:14px;padding:5px 14px;border-radius:99px}
.hero h1{color:#fff;font-size:clamp(30px,6vw,50px);line-height:1.12;margin:14px 0;text-shadow:0 2px 14px rgba(15,42,95,.25)}
.hero p{color:#eef5ff;font-size:18px;margin:0 0 22px;max-width:560px}
.hero small{display:block;margin-top:14px;color:#1e3a8a;font-weight:600}
.hero-img img{border-radius:18px;box-shadow:0 24px 60px rgba(15,42,95,.35);border:4px solid #fff;display:block}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.btn.big{padding:14px 26px;font-size:17px;box-shadow:0 8px 20px rgba(37,99,235,.28)}
.hero .btn:not(.ghost):not(.dis){background:#fff;color:var(--b700)}
.hero .btn.ghost{background:rgba(255,255,255,.22);color:#fff;box-shadow:none;border:1px solid rgba(255,255,255,.7)}
.sec{padding:56px 0}.sec.tint{background:#f3f8ff}
.sec h2{margin:0 0 8px;font-size:clamp(24px,4vw,32px)}
.sub,.lead{color:var(--mut);margin:0 0 26px;font-size:17px}
.steps{display:grid;gap:16px;grid-template-columns:1fr}
.step{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 6px 18px rgba(37,99,235,.07)}
.step h3{margin:10px 0 4px}.step p{margin:0;color:var(--mut)}
.num{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--b600);color:#fff;font-weight:800}
.ic{font-size:28px;display:block;margin-bottom:6px}
.split{display:grid;gap:26px;align-items:center;grid-template-columns:1fr}
img.shadow{border-radius:16px;box-shadow:0 18px 44px rgba(15,42,95,.25);display:block}
.shots{display:grid;gap:22px;grid-template-columns:1fr 1fr}
.shots figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:0 8px 22px rgba(37,99,235,.09)}
.shots img{border-radius:12px;display:block;width:100%;aspect-ratio:560/700;object-fit:cover;object-position:top;border:1px solid var(--line)}
.shots figcaption{padding:10px 4px 2px}.shots figcaption b{display:block;color:var(--b700)}.shots figcaption span{color:var(--mut);font-size:14px}
.tw{overflow-x:auto}
.plans .card{position:relative}.plans .pop{border:2px solid var(--b500);transform:translateY(-4px)}
.ribbon{position:absolute;top:-11px;left:50%;transform:translateX(-50%);background:var(--b600);color:#fff;font-size:12px;font-weight:700;padding:2px 12px;border-radius:99px}
.narrow{max-width:760px}
.endcta{text-align:center;padding:60px 0;background:linear-gradient(180deg,#fff 0,#dbeafe 55%,#93c5fd 100%)}
.endcta h2{margin:0 0 8px;font-size:clamp(24px,4vw,34px)}.endcta p{color:#1e3a8a;margin:0 0 20px;font-size:18px}
.endcta .cta{justify-content:center}
.foot{margin-top:0;background:#fff}
@media(min-width:760px){.hero-in{grid-template-columns:1.05fr 1fr}.steps{grid-template-columns:repeat(3,1fr)}.split{grid-template-columns:1fr 1.2fr}.shots{grid-template-columns:repeat(4,1fr)}}
@media(max-width:480px){.shots{grid-template-columns:1fr 1fr;gap:12px}.shots figure{padding:8px}.shots figcaption span{display:none}.hero{padding:34px 0 50px}nav a{margin-left:10px}nav a:not(.lang):nth-child(2){display:none}}
.land .wrap{max-width:1080px}
.hero .btn.ghost{background:var(--b700);color:#fff;border:0;box-shadow:0 8px 20px rgba(29,78,216,.3)}
.hero .btn.dis{background:#fff;color:#475569}
.land .grid:not(.plans){grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.cmp td:first-child{min-width:190px}
@media(max-width:600px){.cmp th,.cmp td{padding:8px 8px;font-size:14px}.cmp td.c{white-space:normal;min-width:84px}.cmp td:first-child{min-width:0}}
.top .wrap{max-width:1080px}
.hero{background:linear-gradient(180deg,#2563eb 0,#3b82f6 45%,#93c5fd 72%,#fff 100%)}
.hero p{color:#fff;text-shadow:0 1px 8px rgba(15,42,95,.25)}
.vid{text-align:center}.vid .sub{margin-bottom:18px}
.ratio{position:relative;width:100%;aspect-ratio:16/9;border-radius:18px;overflow:hidden;box-shadow:0 18px 44px rgba(15,42,95,.25);background:#0b1d4d;border:4px solid #fff}
.ratio iframe{position:absolute;inset:0;width:100%;height:100%;border:0}