:root{
 --plum:#4a1259;--violet:#7a1f86;--magenta:#d6246e;--blush:#fcebf3;--tint:#fbf6fc;
 --ink:#1f1226;--muted:#5d4f67;--line:#e7dbea;--white:#fff;
 --display:"Lexend",system-ui,sans-serif;--body:"Be Vietnam Pro",system-ui,sans-serif;
 --wrap:1120px;--r-lg:28px;--r-md:16px;--r-sm:10px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--white);color:var(--ink);font:400 17px/1.65 var(--body);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--violet)}
h1,h2,h3{font-family:var(--display);line-height:1.15;margin:0 0 .5em;color:var(--plum)}
h1{font-size:clamp(2.3rem,5.4vw,4rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.75rem,3.2vw,2.5rem);font-weight:700;letter-spacing:-.01em}
h3{font-size:1.2rem;font-weight:600}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow{max-width:760px}
.skip{position:absolute;left:-999px;top:8px;background:var(--plum);color:#fff;padding:8px 14px;border-radius:8px;z-index:20}
.skip:focus{left:8px}
:focus-visible{outline:3px solid var(--magenta);outline-offset:3px;border-radius:4px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:999px;border:2px solid var(--magenta);background:var(--magenta);color:#fff;font:600 1rem/1 var(--display);text-decoration:none;cursor:pointer;transition:background .15s,color .15s}
.btn:hover{background:#b81b5c;border-color:#b81b5c}
.btn-small{min-height:40px;padding:0 16px;font-size:.92rem}
.btn-ghost{background:transparent;color:var(--magenta)}
.btn-ghost:hover{background:var(--blush);color:#b81b5c}
.btn-light{background:#fff;border-color:#fff;color:var(--plum)}
.btn-light:hover{background:var(--blush);border-color:var(--blush)}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.7);color:#fff}
.btn-outline-light:hover{background:rgba(255,255,255,.12)}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0}

/* header */
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--plum);font:600 1.1rem/1 var(--display)}
.brand img{width:40px;height:40px;object-fit:contain}
.brand b{color:var(--magenta);font-weight:700}
.nav{display:flex;align-items:center;gap:22px}
.nav a:not(.btn){color:var(--ink);text-decoration:none;font-weight:500;font-size:.96rem}
.nav a:not(.btn):hover{color:var(--magenta)}
.menu-toggle{display:none;border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:8px 16px;font:600 .95rem var(--display);color:var(--plum)}

/* hero */
.hero{padding:56px 0 40px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.place{color:var(--violet);font-weight:600;margin-bottom:14px}
.lead{font-size:1.15rem;color:var(--muted);max-width:34em}
.facts{list-style:none;padding:0;margin:8px 0 0;display:flex;flex-wrap:wrap;gap:10px 28px;color:var(--muted)}
.facts b{display:block;font:700 1.5rem/1.2 var(--display);color:var(--plum)}
.spiral{margin:0}
.spiral svg{width:100%;height:auto;max-width:520px;display:block;margin:0 auto}
.spiral figcaption{text-align:center;color:var(--muted);font-size:.92rem;max-width:30em;margin:8px auto 0}
.track{fill:none;stroke:var(--blush);stroke-width:22;stroke-linecap:round}
.path{fill:none;stroke:var(--magenta);stroke-width:5;stroke-linecap:round}
.stop circle{fill:#fff;stroke:var(--violet);stroke-width:3}
.stop text{font:600 18px var(--display);fill:var(--plum);paint-order:stroke;stroke:#fff;stroke-width:6px;stroke-linejoin:round}
.stop .band-label{font:500 14px var(--body);fill:var(--muted)}
.core circle{fill:var(--plum)}
.core text{font:700 19px var(--display);fill:#fff}

/* sections */
.section{padding:88px 0}
.section-tint{background:var(--tint)}
.section-lead{color:var(--muted);font-size:1.08rem;max-width:44em}

/* route */
.route{list-style:none;padding:0;margin:36px 0 0;display:grid;gap:0;border-top:1px solid var(--line)}
.stage{display:grid;grid-template-columns:56px minmax(180px,.9fr) 2fr 190px;gap:8px 24px;align-items:baseline;padding:22px 0;border-bottom:1px solid var(--line)}
.stage-no{font:700 1.5rem var(--display);color:var(--magenta)}
.stage h3{margin:0}
.band{margin:2px 0 0;font:600 1rem var(--display);color:var(--violet)}
.band span{font-weight:500;color:var(--muted)}
.stage > p{margin:0;color:var(--ink)}
.meta{color:var(--muted);font-size:.93rem}
.stage .meta{text-align:right}
.note-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px 32px;margin-top:32px;padding:22px 26px;background:var(--blush);border-radius:var(--r-md)}
.note{margin:0;max-width:46em}

/* how */
.how{display:grid;grid-template-columns:repeat(2,1fr);gap:36px 56px;margin-top:32px}
.how article{border-left:4px solid var(--magenta);padding-left:20px}
.how p{color:var(--muted);margin:0}

/* Co Loa */
.coloa{background:var(--plum);color:#f3e7f6}
.coloa h2{color:#fff}
.coloa-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center}
.coloa-grid > div:first-child p{font-size:1.1rem;max-width:36em}
.app-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:var(--r-lg);padding:28px}
.app-card h3{color:#fff}
.app-card p{color:#e5d5ea}

/* teacher */
.teacher{display:grid;grid-template-columns:220px 1fr;gap:48px;align-items:start}
.teacher-badge{width:200px;aspect-ratio:1;border-radius:50%;background:var(--blush);display:grid;place-content:center;text-align:center;border:10px solid #fff;box-shadow:0 0 0 2px var(--magenta)}
.teacher-badge span{font:700 4rem/1 var(--display);color:var(--magenta)}
.teacher-badge small{font:600 1.1rem var(--display);color:var(--plum)}
.creds{padding-left:1.2em;margin:0 0 1em}
.creds li{margin:.25em 0}
.creds li::marker{color:var(--magenta)}

/* other courses */
.other{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:28px}
.other article{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:26px}
.other p{margin-bottom:.6em}

/* faq */
details{border-bottom:1px solid var(--line);padding:16px 0}
details:first-of-type{border-top:1px solid var(--line);margin-top:24px}
summary{cursor:pointer;font:600 1.08rem var(--display);color:var(--plum);list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--magenta);font-size:1.4rem;line-height:1}
details[open] summary::after{content:"−"}
details p{margin:12px 0 4px;color:var(--muted)}

/* signup */
.signup{background:var(--plum);color:#f3e7f6}
.signup h2{color:#fff}
.signup-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.contact{list-style:none;padding:0;margin:24px 0}
.contact li{display:grid;grid-template-columns:130px 1fr;gap:12px;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.15)}
.contact span{color:#cdb6d6;font-size:.92rem}
.contact a{color:#fff;text-decoration:none;font-weight:500}
.contact a:hover{text-decoration:underline}
.lead-form{background:#fff;color:var(--ink);border-radius:var(--r-lg);padding:30px;display:grid;gap:16px}
.lead-form label{display:grid;gap:6px;font-weight:500;font-size:.95rem;color:var(--plum)}
.lead-form input,.lead-form select,.lead-form textarea{font:inherit;font-size:1rem;color:var(--ink);padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--r-sm);background:#fff;width:100%}
.lead-form input:focus,.lead-form select:focus,.lead-form textarea:focus{border-color:var(--violet);outline:none;box-shadow:0 0 0 3px rgba(122,31,134,.18)}
.lead-form [aria-invalid=true]{border-color:var(--magenta)}
.lead-form .btn{width:100%}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-status{margin:0;min-height:1.5em;font-weight:500}
.form-status.ok{color:#15803d}
.form-status.err{color:#b81b5c}

/* footer */
.site-footer{padding:28px 0;font-size:.92rem;color:var(--muted)}
.footer-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 32px}
.site-footer p{margin:0}
.site-footer a{color:var(--muted)}

/* responsive */
@media (max-width:960px){
 .hero-grid,.coloa-grid,.signup-grid{grid-template-columns:1fr}
 .spiral svg{max-width:420px}
 .stage{grid-template-columns:44px 1fr;}
 .stage > p{grid-column:2}
 .stage .meta{text-align:left}
 .teacher{grid-template-columns:1fr;gap:24px}
 .teacher-badge{width:150px}
 .teacher-badge span{font-size:3rem}
}
@media (max-width:820px){
 .menu-toggle{display:block}
 .nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 20px;border-bottom:1px solid var(--line)}
 .nav.open{display:flex}
 .nav a:not(.btn){padding:12px 0;border-bottom:1px solid var(--line)}
 .nav .btn{margin-top:14px}
 .how,.other{grid-template-columns:1fr}
}
@media (max-width:480px){
 body{font-size:16px}
 .wrap{padding:0 16px}
 .section{padding:64px 0}
 .hero{padding-top:32px}
 .contact li{grid-template-columns:1fr;gap:2px}
 .lead-form{padding:22px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media (max-width:600px){.stop text{font-size:22px}.stop .band-label{font-size:18px}.core text{font-size:24px}}

/* achievements */
.wins{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:32px}
.win{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;display:flex;flex-direction:column}
.win img{width:100%;aspect-ratio:4/3;object-fit:cover;object-position:center 30%}
.win figcaption{padding:20px 22px 22px}
.win-text{background:var(--blush);border-color:var(--blush);justify-content:center}
.win-top{background:var(--plum);border-color:var(--plum)}
.win.win-top .score,.win.win-top h3{color:#fff}.win.win-top .score span{color:#f3d3e5}
.win.win-top .meta,.win.win-top blockquote{color:#eadcef}
.score{font:700 2.6rem/1 var(--display);color:var(--magenta);margin:0 0 10px}
.score span{font-size:1rem;font-weight:600;color:var(--plum)}
.win h3{margin:0 0 4px}
.win blockquote{margin:12px 0 0;color:var(--muted);font-size:.98rem}
.how-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:48px;align-items:start;margin-top:32px}
.how-grid .how{grid-template-columns:1fr;margin-top:0;gap:28px}
.class-photo{margin:0}
.class-photo img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:var(--r-lg)}
.class-photo figcaption{color:var(--muted);font-size:.9rem;margin-top:8px}
@media (max-width:1100px){.wins{grid-template-columns:repeat(2,1fr)}}
@media (max-width:960px){.how-grid{grid-template-columns:1fr}.win img{aspect-ratio:16/10}.class-photo img{aspect-ratio:4/3}}

@media (max-width:640px){.wins{grid-template-columns:1fr}}