:root{--navy:#1c355e;--navy2:#132744;--pink:#ed1459;--pink-d:#c40f4a;--ink:#16233a;--mut:#5a6880;--line:#e3e8f0;--bg:#fff;--alt:#f5f7fb;--r:14px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--pink-d)}
img{max-width:100%;height:auto}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3{color:var(--navy);line-height:1.2;margin:0 0 .5em}
h1{font-size:clamp(32px,5vw,52px);font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(26px,3.4vw,36px);font-weight:800;letter-spacing:-.01em}
h3{font-size:19px;font-weight:700}
p{margin:0 0 1em}
.sub{color:var(--mut);font-size:18px;max-width:720px}
.kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--pink);margin-bottom:12px}
section{padding:72px 0}
section.alt{background:var(--alt)}
section.dark{background:var(--navy);color:#dfe6f2}
section.dark h2,section.dark h3{color:#fff}

/* header */
header.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;gap:28px;height:68px}
.logo img{display:block;height:34px;width:auto}
nav.main{display:flex;gap:22px}
nav.main a{color:var(--ink);text-decoration:none;font-weight:500;font-size:15px}
nav.main a:hover,nav.main a.on{color:var(--pink)}
.spacer{flex:1}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px;color:var(--navy);cursor:pointer}

.btn{display:inline-block;padding:13px 24px;border-radius:999px;font-weight:700;font-size:15px;text-decoration:none;border:2px solid transparent;cursor:pointer;font-family:inherit}
.btn.p{background:var(--pink);color:#fff}
.btn.p:hover{background:var(--pink-d)}
.btn.s{border-color:var(--navy);color:var(--navy);background:#fff}
.btn.s:hover{background:var(--navy);color:#fff}
.btn.sm{padding:9px 18px;font-size:14px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}

/* hero */
.hero{padding:88px 0 72px;background:radial-gradient(1000px 420px at 85% 0%,#fde3ec 0,transparent 60%),radial-gradient(900px 500px at 0% 100%,#e6ecf7 0,transparent 60%)}
.hero .grid2{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero h1 em{font-style:normal;color:var(--pink)}
.hero .sub{font-size:19px}
.facts{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:28px;color:var(--mut);font-size:14px;font-weight:500}
.facts span::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--pink);margin-right:8px;vertical-align:1px}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:0 20px 50px -24px rgba(27,53,94,.35)}
.hero-card h3{margin-bottom:14px}
.ring{display:flex;align-items:center;gap:18px;padding:12px 0;border-top:1px solid var(--line)}
.ring:first-of-type{border-top:0}
.ring b{font-size:28px;color:var(--navy);min-width:100px;font-weight:800;white-space:nowrap}
.ring span{color:var(--mut);font-size:14px}

/* grids + cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}
section.alt .card{border-color:#e6ebf3}
a.card{text-decoration:none;color:inherit;transition:transform .15s,box-shadow .15s}
a.card:hover{transform:translateY(-3px);box-shadow:0 14px 30px -18px rgba(27,53,94,.4)}
.card p{color:var(--mut);margin:0}
.card .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--pink);background:#fdebf1;border-radius:999px;padding:3px 10px;margin-bottom:12px}
.card .more{display:inline-block;margin-top:14px;font-weight:700;color:var(--navy);font-size:14px}
.score{font-size:40px;font-weight:800;color:var(--pink);margin:0 0 4px;line-height:1}
.tutor{display:flex;gap:16px;align-items:flex-start}
.tutor img{width:72px;height:72px;border-radius:50%;object-fit:cover;flex:none}
.tutor .cred{color:var(--navy);font-weight:600;font-size:14px;margin-bottom:6px}
.tutor ul{margin:0 0 8px;padding-left:18px;color:var(--mut);font-size:14px}
.tutor .subj{font-size:13px;color:var(--pink-d);font-weight:600}

/* steps */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.steps li{list-style:none;counter-increment:s;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px}
.steps li::before{content:counter(s);display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;font-weight:800;margin-bottom:14px}
.steps h3{font-size:17px}
.steps p{color:var(--mut);margin:0;font-size:15px}
section.dark .steps li{background:var(--navy2);border-color:#2a4772}
section.dark .steps li::before{background:var(--pink)}
section.dark .steps p{color:#b9c6dc}

.formats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.formats .card h3{display:flex;align-items:center;gap:10px}

.results{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.results figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.results img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;object-position:top}
.results figcaption{padding:10px 14px;font-weight:700;color:var(--navy);font-size:14px}

/* page header */
.page-h{padding:64px 20px 40px}
.page-h p{font-size:18px;color:var(--mut);max-width:780px}
.ticks{padding:0;margin:16px 0 0}
.ticks li{list-style:none;padding-left:28px;position:relative;margin-bottom:8px}
.ticks li::before{content:"";position:absolute;left:0;top:7px;width:16px;height:9px;border-left:3px solid var(--pink);border-bottom:3px solid var(--pink);transform:rotate(-45deg)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}

/* faq */
.faq details{border-bottom:1px solid var(--line);padding:16px 0}
.faq summary{cursor:pointer;font-weight:700;color:var(--navy);font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::after{content:"+";color:var(--pink);font-size:22px;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:10px 0 0;color:var(--mut)}

/* form */
form.wl{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px;display:grid;gap:14px;box-shadow:0 20px 50px -30px rgba(27,53,94,.4)}
form.wl .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
form.wl label{display:block;font-size:13px;font-weight:600;color:var(--navy);margin-bottom:5px}
form.wl input,form.wl textarea,form.wl select{width:100%;padding:11px 13px;border:1px solid #cfd7e4;border-radius:10px;font:inherit;font-size:15px;background:#fff;color:var(--ink)}
form.wl textarea{min-height:96px;resize:vertical}
form.wl input:focus,form.wl textarea:focus,form.wl select:focus{outline:2px solid var(--pink);outline-offset:0;border-color:transparent}
.hp{position:absolute;left:-9999px}
.msg{margin:0;font-weight:600;font-size:14px}
.msg.ok{color:#1a7f45}.msg.err{color:#c62828}
.note{font-size:13px;color:var(--mut)}

/* footer */
footer{background:var(--navy2);color:#aebbd2;padding:56px 0 28px;font-size:14px}
footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
footer h4{color:#fff;margin:0 0 12px;font-size:15px}
footer a{color:#aebbd2;text-decoration:none;display:block;margin-bottom:7px}
footer a:hover{color:#fff}
footer .legal{border-top:1px solid #2a4772;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
footer .legal b{color:#fff;font-weight:600}
footer img.flogo{height:30px;width:auto;margin-bottom:14px;filter:brightness(0) invert(1)}

.prose{max-width:760px}
.prose h2{font-size:22px;margin-top:32px}

@media (max-width:900px){
  .hero .grid2,.split{grid-template-columns:1fr}
  .g3,.g4,.steps,.formats,.results{grid-template-columns:repeat(2,1fr)}
  footer .cols{grid-template-columns:1fr 1fr}
  nav.main{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 20px;gap:14px;border-bottom:1px solid var(--line)}
  nav.main.open{display:flex}
  .menu-btn{display:block}
  .hd-cta{display:none}
}
@media (max-width:600px){
  section{padding:52px 0}
  .wrap{padding:0 16px}
  .g2,.g3,.g4,.steps,.formats,.results,form.wl .row,footer .cols{grid-template-columns:1fr}
  .hero{padding:56px 0 48px}
}

/* WhatsApp */
.btn.wa{background:#25d366;color:#fff;margin-top:20px}
.btn.wa:hover{background:#1ebe5a}
.wa-float{position:fixed;right:20px;bottom:20px;z-index:30;width:56px;height:56px;border-radius:50%;background:#25d366;display:grid;place-items:center;box-shadow:0 10px 24px -8px rgba(0,0,0,.35)}
.wa-float:hover{transform:scale(1.06)}
footer{padding-bottom:90px}

/* ảnh thật + feedback (20/10/2026) */
.hero-photo{margin:0;border-radius:22px;overflow:hidden;box-shadow:0 24px 60px -28px rgba(28,53,94,.5);background:#fff}
.hero-photo img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover}
.hero-photo figcaption{padding:10px 16px;font-size:13px;color:var(--mut)}
.proof{padding:28px 0;border-bottom:1px solid var(--line)}
.proof .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat b{display:block;font-size:30px;font-weight:800;color:var(--navy);line-height:1.1}
.stat span{font-size:14px;color:var(--mut)}
.story{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center;margin-top:32px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:0 24px 60px -36px rgba(28,53,94,.45)}
.story-img img{display:block;width:100%;border-radius:12px;border:1px solid var(--line)}
.tag{display:inline-block;font-size:12px;font-weight:700;color:var(--pink);background:#fdebf1;border-radius:999px;padding:3px 10px;margin-bottom:10px}
.big-score{font-size:64px;font-weight:800;color:var(--pink);line-height:1;margin:4px 0 18px}
.big-score small{display:block;font-size:15px;font-weight:600;color:var(--navy);margin-top:8px}
blockquote{margin:0 0 16px;font-size:18px;line-height:1.5;color:var(--ink);border-left:4px solid var(--pink);padding:2px 0 2px 16px}
blockquote cite{display:block;font-style:normal;font-size:14px;color:var(--mut);margin-top:6px;font-weight:600}
.src{font-size:14px;color:var(--mut);margin:8px 0 0}
.tr{display:inline-block;font-size:12px;color:var(--mut);background:var(--alt);border-radius:6px;padding:2px 8px;margin-left:6px}
.quotes{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:28px}
.qcard{margin:0;background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;display:flex;flex-direction:column}
.qcard img{display:block;width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center 22%;border-bottom:1px solid var(--line)}
.qcard figcaption{padding:16px}
.qcard blockquote{font-size:16px}
.pquotes{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:28px}
.pquotes blockquote{background:var(--alt);border-radius:14px;border-left:0;padding:20px;margin:0;font-size:16px}
.results{grid-template-columns:repeat(4,1fr)}
.results a{display:block}
.countries{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.ctry{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:inherit;transition:transform .15s}
.ctry:hover{transform:translateY(-2px);border-color:var(--pink)}
.ctry b{display:block;color:var(--navy);font-size:17px;margin-bottom:4px}
.ctry span{font-size:14px;color:var(--mut)}
.gallery{display:grid;grid-template-columns:2fr 1fr 1fr;grid-template-rows:auto auto;gap:16px}
.gallery figure{margin:0;border-radius:16px;overflow:hidden;background:#fff;border:1px solid var(--line)}
.gallery img{display:block;width:100%;height:100%;max-height:340px;object-fit:cover}
.gallery .g-big{grid-row:span 2}
.gallery .g-big img{max-height:none;height:calc(100% - 38px)}
.gallery figcaption{padding:8px 12px;font-size:13px;color:var(--mut)}
.tutor.lg img{width:112px;height:112px}
@media (max-width:900px){
  .story{grid-template-columns:1fr}
  .proof .wrap,.quotes,.countries{grid-template-columns:repeat(2,1fr)}
  .pquotes{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr 1fr}
  .gallery .g-big{grid-column:span 2;grid-row:auto}
  .gallery .g-big img{height:auto}
}
@media (max-width:600px){
  .quotes,.countries{grid-template-columns:1fr}
  .big-score{font-size:52px}
  .story{padding:18px}
  .tutor.lg img{width:88px;height:88px}
}
/* đội học thuật ảnh lớn */
.team{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:28px}
.tm{margin:0;background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;display:flex;flex-direction:column}
.tm img{display:block;width:100%;aspect-ratio:1/1;object-fit:cover;object-position:center 20%}
.tm figcaption{padding:16px 18px 18px}
.tm h3{font-size:18px;margin-bottom:4px}
.tm .cred{color:var(--navy);font-weight:600;font-size:14px;margin:0 0 8px}
.tm ul{margin:0 0 10px;padding-left:18px;color:var(--mut);font-size:14px}
.tm .subj{font-size:13px;color:var(--pink-d);font-weight:600;margin:0}
@media (max-width:900px){.team{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.team{grid-template-columns:1fr 1fr;gap:12px}.tm figcaption{padding:12px}.tm h3{font-size:16px}.tm ul{display:none}}