:root{--ink:#f4f9ff;--muted:#aebfdb;--muted2:#7f91af;--blue:#127aff;--cyan:#36e5f7;--gold:#f8b94d;--bg:#07142c;--panel:#0d2145;--panel2:#102950;--stroke:rgba(159,199,255,.16);--shadow:0 22px 68px rgba(1,5,24,.4);--radius:22px;font-family:Inter,"Segoe UI",Roboto,Arial,sans-serif;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(ellipse 90% 55% at 60% -10%,#123976 0,rgba(9,28,61,.3) 57%,transparent 100%),var(--bg);color:var(--ink);font-size:16px;line-height:1.55;overflow-x:hidden}button,input{font:inherit}a{color:inherit;text-decoration:none}a,button{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}img{max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.17;letter-spacing:-.035em}h1{font-size:clamp(2.7rem,6vw,5.1rem)}h2{font-size:clamp(2rem,4vw,3rem)}h3{font-size:1.23rem}p{color:var(--muted)}:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}.container{width:min(1180px,calc(100% - 44px));margin:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:-90px;z-index:30;background:white;color:#07142c;padding:12px;border-radius:10px}.skip-link:focus{top:8px;left:8px}.notice{background:#102b54;color:#cfedff;text-align:center;font-size:12px;padding:8px 12px;letter-spacing:.01em;border-bottom:1px solid var(--stroke)}.pulse{display:inline-block;width:7px;height:7px;background:#40dfbc;border-radius:50%;box-shadow:0 0 13px #43deb1;margin-right:7px}.site-header{position:sticky;top:0;z-index:10;background:rgba(6,17,38,.9);border-bottom:1px solid var(--stroke);backdrop-filter:blur(18px)}.nav-inner{display:flex;align-items:center;gap:23px;min-height:85px}.logo-link{display:flex;align-items:center;flex-shrink:0}.logo-link img{display:block;width:168px;height:auto}.site-nav{display:flex;align-items:center;gap:21px;flex:1;justify-content:center}.site-nav a{color:#bfcfeb;font-size:13px;font-weight:650;white-space:nowrap;transition:color .2s}.site-nav a:hover,.site-nav a.active{color:#62e8ff}.nav-cta,.btn{display:inline-flex;align-items:center;justify-content:center;gap:12px;border:0;border-radius:13px;background:linear-gradient(117deg,#1688fd,#14c6e7);color:white;box-shadow:0 9px 26px rgba(7,123,237,.22);font-weight:750;padding:13px 21px;white-space:nowrap;transition:transform .18s,box-shadow .18s}.nav-cta{font-size:13px}.btn:hover,.nav-cta:hover{transform:translateY(-2px);box-shadow:0 13px 28px rgba(7,123,237,.3)}.btn-outline{background:rgba(16,35,68,.74);border:1px solid #426487;box-shadow:none}.btn-light{background:white;color:#102b50;box-shadow:none}.btn:disabled{transform:none;box-shadow:none}.menu-toggle{display:none;background:transparent;border:1px solid var(--stroke);width:42px;height:42px;border-radius:9px;padding:10px}.menu-toggle span{display:block;height:2px;background:white;margin:5px 0}.section{padding:82px 0}.section.smaller{padding:50px 0}.section-head{max-width:790px;margin-bottom:30px}.overline{display:inline-flex;align-items:center;gap:9px;text-transform:uppercase;letter-spacing:.14em;font-size:11px;font-weight:800;color:#71dfff;margin-bottom:16px}.overline:before{content:'';height:6px;width:6px;border-radius:50%;background:#27e1ed;box-shadow:0 0 13px #12d9f6}.section-head p,.lead{font-size:clamp(1rem,1.5vw,1.17rem);max-width:720px;line-height:1.75}.hero{position:relative;padding:68px 0 56px;overflow:hidden}.hero:before{content:'';position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 70% 47%,rgba(7,98,218,.18),transparent 45%)}.hero-grid{position:relative;display:grid;grid-template-columns:.94fr 1.06fr;align-items:center;gap:50px}.hero-content h1{margin:0 0 21px}.gradient-text{background:linear-gradient(100deg,#66edff,#64a5ff 65%,#ffe0a1);-webkit-background-clip:text;background-clip:text;color:transparent}.hero-content p{font-size:17px;line-height:1.78;max-width:500px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.hero-visual{position:relative;background:linear-gradient(145deg,#14366a,#06142a);border:1px solid rgba(93,194,255,.34);padding:9px;border-radius:28px;box-shadow:0 30px 100px rgba(0,101,255,.22);overflow:hidden}.hero-visual img{display:block;width:100%;border-radius:20px;aspect-ratio:16/9;object-fit:cover}.hero-visual .corner-label{position:absolute;left:23px;bottom:24px;border:1px solid rgba(149,220,255,.35);background:rgba(3,18,46,.7);backdrop-filter:blur(9px);padding:9px 13px;border-radius:10px;font-size:11px;color:#d5edff}.kicker-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:49px}.mini-benefit{border-top:1px solid rgba(97,164,238,.27);padding:18px 10px 0 0;display:flex;gap:12px}.benefit-num{flex:0 0 auto;color:#54dffb;font-weight:850;font-size:13px}.mini-benefit strong{font-size:14px}.mini-benefit p{font-size:12px;margin:5px 0;color:var(--muted2)}.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.card{position:relative;background:linear-gradient(155deg,rgba(25,55,105,.84),rgba(8,26,56,.92));border:1px solid var(--stroke);border-radius:var(--radius);padding:24px;min-height:265px;overflow:hidden;transition:transform .2s,border-color .2s}.card:hover{transform:translateY(-3px);border-color:#5189bf}.card::before{content:'';position:absolute;right:-55px;top:-85px;width:130px;height:180px;background:radial-gradient(ellipse,rgba(24,144,240,.2),transparent 70%)}.card-icon{display:inline-grid;place-items:center;width:51px;height:51px;border-radius:15px;font-size:24px;background:linear-gradient(135deg,#193f85,#0c709f);border:1px solid #2b75ac;margin-bottom:20px}.card h3{margin:0 0 10px}.card p{font-size:13px;min-height:62px;margin-bottom:18px}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px}.tag{display:inline-flex;align-items:center;border:1px solid #415d7d;color:#b7c7da;border-radius:99px;padding:4px 9px;font-size:10px;font-weight:750;white-space:nowrap}.tag.ready{border-color:rgba(31,219,191,.45);color:#75f1d6}.text-link{font-size:12px;color:#79ebff;font-weight:750}.feature-panel{display:grid;grid-template-columns:1fr .95fr;gap:36px;align-items:center;background:linear-gradient(120deg,rgba(16,52,112,.66),rgba(9,34,72,.68));border:1px solid var(--stroke);border-radius:28px;padding:36px;overflow:hidden}.feature-panel img{width:100%;max-height:340px;object-fit:contain;border-radius:16px}.feature-panel h2{margin-bottom:14px}.list-check{list-style:none;margin:20px 0 28px;padding:0}.list-check li{position:relative;padding-left:26px;margin:10px 0;color:#cddcf0}.list-check li:before{content:'✓';position:absolute;left:0;color:#54e9dc;font-weight:800}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.step{background:rgba(14,33,68,.54);border:1px solid var(--stroke);border-radius:18px;padding:25px}.step b{font-size:31px;color:#40c9ec;line-height:1}.step h3{margin-top:18px}.step p{font-size:14px}.cta-banner{background:linear-gradient(115deg,#176cc0,#1c4586 60%,#133467);border-radius:24px;padding:36px;display:flex;gap:30px;align-items:center;justify-content:space-between;border:1px solid #407ebf}.cta-banner p{color:#e4eeff;margin-bottom:0}.cta-banner h2{font-size:clamp(1.65rem,3.3vw,2.4rem);margin-bottom:8px}.subhero{padding:61px 0 42px}.subhero .overline{margin-bottom:17px}.subhero h1{font-size:clamp(2.4rem,5vw,3.9rem);max-width:800px;margin-bottom:18px}.subhero p{max-width:800px}.breadcrumb{font-size:12px;color:#8bacc9;margin-bottom:24px}.breadcrumb a{color:#62dff7}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}.info-panel{border:1px solid var(--stroke);background:linear-gradient(155deg,rgba(19,51,101,.76),rgba(9,27,55,.87));border-radius:22px;padding:27px}.info-panel h3{margin-top:0}.info-panel p{font-size:14px}.info-panel ul{color:#cbdcf0;padding-left:20px}.info-panel li{margin-bottom:8px}.age-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.age-card{padding:19px;border:1px solid var(--stroke);border-radius:18px;background:rgba(17,46,94,.6)}.age-card strong{display:block;margin:12px 0 8px;font-size:16px}.age-card p{font-size:13px}.section-tight{padding-top:36px}.path-shell{display:grid;grid-template-columns:.92fr 1.08fr;gap:30px}.choice-list{display:grid;gap:11px}.choice{display:flex;text-align:left;gap:13px;align-items:center;border:1px solid #355275;padding:17px 18px;background:rgba(11,33,70,.8);border-radius:14px;color:#d7e8fc;font-weight:650;transition:.2s}.choice.active{background:linear-gradient(110deg,rgba(17,118,209,.3),rgba(12,57,104,.7));border-color:#32c6ef;box-shadow:inset 0 0 0 1px rgba(49,211,239,.25)}.choice-dot{flex:0 0 auto;width:19px;height:19px;border-radius:50%;border:2px solid #6682a7}.choice.active .choice-dot{border:6px solid #42deef;background:white}.recommendation{border-radius:22px;padding:34px;background:linear-gradient(150deg,#123d7a,#0a1c3c);border:1px solid #4179b9;min-height:285px}.recommendation .icon{font-size:34px;margin-bottom:12px}.recommendation p{font-size:15px}.disclaimer{font-size:12px;color:#90a7c5;margin-top:18px}.demo-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:22px}.demo-board{border:1px solid #315e91;border-radius:24px;background:linear-gradient(155deg,#102e60,#081c3d);padding:30px;box-shadow:var(--shadow)}.demo-top{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:26px}.demo-progress{height:8px;background:#1f4775;border-radius:99px;overflow:hidden;margin:14px 0 20px}.demo-progress>div{height:100%;background:linear-gradient(90deg,#2ba6ff,#38e2d2);transition:width .2s}.demo-question{font-size:clamp(1.55rem,3vw,2.15rem);font-weight:780;line-height:1.4;margin-bottom:28px}.answer-grid{display:grid;gap:11px}.answer-btn{padding:15px 18px;border-radius:13px;border:1px solid #3f648d;background:#153765;color:#f5faff;text-align:left;font-weight:700;transition:background .15s,border-color .15s;display:flex;align-items:center;gap:13px}.answer-btn span{display:grid;place-items:center;flex-shrink:0;width:28px;height:28px;border-radius:7px;background:#214b81;color:#bbe6f9}.answer-btn:hover:not(:disabled){background:#20518b}.answer-btn.correct{background:rgba(24,134,103,.36);border-color:#2dddac}.answer-btn.wrong{background:rgba(165,58,63,.31);border-color:#f48083}.answer-btn:disabled{opacity:1}.answer-btn[disabled]:not(.correct):not(.wrong){opacity:.58}.feedback{border:1px solid rgba(71,190,235,.5);border-radius:15px;background:#0a2b50;padding:20px;margin-top:18px}.feedback.success{border-color:#2ba989}.feedback.error{border-color:#bb7375}.feedback strong{display:block;margin-bottom:9px;color:#79e9d7}.feedback.error strong{color:#ffb7b7}.feedback p{font-size:14px;margin:7px 0}.feedback .tip{background:rgba(57,153,230,.13);border-radius:10px;padding:11px;margin-top:12px;color:#d6eafd}.lesson-side{align-self:start;border:1px solid var(--stroke);border-radius:19px;padding:23px;background:rgba(15,36,70,.84)}.lesson-side h3{margin-bottom:10px}.lesson-side p{font-size:13px}.helper{color:#9bc0e2;font-size:13px}.progress-chip{color:#80e8ff;font-weight:800}.demo-actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:18px}.result-screen{text-align:center;padding:32px 16px}.result-screen .bigscore{font-size:64px;font-weight:850;color:#55e7e9}.result-screen h2{font-size:30px}.footnote{font-size:12px;color:#8ca3c0}.tiny-pill{display:inline-flex;border:1px solid rgba(99,208,245,.4);border-radius:99px;padding:5px 10px;font-size:10px;color:#bdefff;font-weight:800;letter-spacing:.07em}.site-footer{margin-top:60px;padding:38px 0 14px;background:#041024;border-top:1px solid var(--stroke)}.footer-top{display:grid;grid-template-columns:2.4fr 1fr 1.1fr;gap:25px;padding-bottom:31px}.footer-brand img{display:block;width:190px}.footer-brand p{font-size:12px;margin:2px 0 0}.footer-col{display:flex;flex-direction:column;gap:9px}.footer-col strong{margin-bottom:8px;font-size:14px}.footer-col a{color:#99b2d1;font-size:13px}.footer-col a:hover{color:#65e6ef}.footer-bottom{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--stroke);padding:17px 0;font-size:11px;color:#7d95b4}.content-small{max-width:850px}.content-small p,.content-small li{line-height:1.8}
@media(max-width:1040px){.site-nav{gap:13px}.site-nav a{font-size:12px}.logo-link img{width:145px}.nav-inner{gap:14px}.cards{grid-template-columns:repeat(2,1fr)}.age-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.nav-inner{min-height:70px}.site-nav{display:none;position:absolute;top:100%;left:0;right:0;padding:16px 22px 23px;background:#071935;border-bottom:1px solid #305680;box-shadow:0 18px 40px rgba(0,0,0,.36);flex-direction:column;align-items:stretch;gap:0}.site-nav.open{display:flex}.site-nav a{padding:13px 4px;border-bottom:1px solid var(--stroke);font-size:14px}.menu-toggle{display:block;margin-left:auto}.nav-cta{padding:10px 13px}.hero-grid{grid-template-columns:1fr;gap:36px}.hero{padding-top:46px}.hero-content p{max-width:640px}.feature-panel{grid-template-columns:1fr}.feature-panel img{max-height:260px}.path-shell,.demo-layout{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.hero-visual{max-width:720px}}
@media(max-width:580px){.container{width:min(100% - 30px,1180px)}.notice{font-size:10px}.logo-link img{width:122px}.nav-cta{font-size:12px;padding:10px}.nav-cta span{display:none}.hero h1{font-size:clamp(2.3rem,10vw,3.4rem)}.hero{padding:39px 0 35px}.hero-content p{font-size:15px}.hero-visual{border-radius:20px}.hero-visual img{border-radius:13px}.hero-visual .corner-label{display:none}.kicker-strip{grid-template-columns:1fr;gap:0;margin-top:30px}.mini-benefit{padding:11px 0}.section{padding:54px 0}.cards,.two-col,.age-grid{grid-template-columns:1fr}.card{min-height:0}.card p{min-height:0}.feature-panel{padding:23px}.cta-banner{flex-direction:column;align-items:flex-start;padding:27px}.actions{align-items:stretch}.actions .btn{width:100%}.demo-board{padding:19px}.demo-top{align-items:flex-start}.demo-question{font-size:1.45rem}.footer-top{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-bottom{flex-direction:column}.recommendation{padding:23px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}
@media(max-width:580px){.feature-panel img{display:none}}

/* E-LAB active learning entry: 2026 Midterm Sprint */
.elab-midterm-launch{padding-top:40px;padding-bottom:52px;background:linear-gradient(130deg,rgba(16,67,127,.24),rgba(3,16,43,.14))}
.elab-grade-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.elab-grade-card{display:flex;align-items:center;gap:16px;border-radius:20px;padding:20px 18px;border:1px solid rgba(77,209,255,.3);background:linear-gradient(120deg,rgba(11,43,90,.9),rgba(7,24,60,.9));min-height:115px;box-shadow:0 10px 28px rgba(0,0,0,.12);transition:transform .18s, border-color .18s}
.elab-grade-card:hover,.elab-grade-card:focus-visible{transform:translateY(-3px);border-color:#47dff5}
.elab-grade-card strong{display:block;font-size:1.24rem;color:#fff}
.elab-grade-card span{display:block;color:#b6d5f2;font-size:.86rem}
.elab-grade-icon{width:60px;height:60px;flex:none;display:grid!important;place-items:center;border-radius:16px;background:#144fa0;color:#fff!important;font-size:1.75rem!important;font-weight:800;border:1px solid #34dcff}
.elab-grade-card .elab-arrow{margin-left:auto;color:#4fe7ff!important;font-weight:900;font-size:1.5rem}
@media(max-width:800px){.elab-grade-grid{grid-template-columns:1fr}.elab-midterm-launch{padding-top:24px;padding-bottom:24px}.elab-grade-card{min-height:88px;padding:13px 15px}}

/* E-LAB V4 — official contact and free game lab */
.nav-contact{color:#a9eeff;font-weight:750;font-size:12px;white-space:nowrap;padding:9px 11px;border:1px solid rgba(76,191,238,.35);border-radius:11px}
.nav-contact:hover{background:rgba(35,141,203,.17)}
.contact-shortcuts{position:fixed;right:18px;bottom:18px;z-index:40;display:flex;gap:8px;align-items:center}
.contact-shortcuts a{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:10px 13px;border-radius:999px;font-size:12px;font-weight:850;color:white;box-shadow:0 7px 26px rgba(0,0,0,.35)}
.contact-call{background:#135baf;border:1px solid #49adff}.contact-zalo{background:#0068ff;border:1px solid #4bbafa}
.contact-shortcuts a:hover{filter:brightness(1.1)}
.footer-top{grid-template-columns:2fr 1fr 1.1fr 1fr}
.game-feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.game-feature-card{background:linear-gradient(135deg,#133e7c,#091e40);border:1px solid #3273a6;border-radius:20px;padding:25px;display:flex;gap:20px;align-items:center;justify-content:space-between}
.game-feature-card h3{font-size:20px;margin-bottom:8px}.game-feature-card p{font-size:13px;margin-bottom:14px}
.game-feature-card .game-emoji{font-size:38px;flex:none}
@media(max-width:1180px){.nav-contact{display:none}}
@media(max-width:820px){.footer-top{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.game-feature-grid{grid-template-columns:1fr}}
@media(max-width:580px){.contact-shortcuts{bottom:10px;right:10px;gap:5px}.contact-shortcuts a{padding:10px;font-size:12px;min-height:44px}.contact-shortcuts .contact-call span{display:none}.contact-shortcuts .contact-zalo span{display:none}.site-footer{padding-bottom:67px}}

/* E-LAB V5 Cambridge library; belongs to School English, not global nav */
.cambridge-launch{padding-top:24px;padding-bottom:42px}
.cambridge-level-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.cambridge-level-card{display:flex;flex-direction:column;align-items:flex-start;gap:8px;min-height:223px;padding:22px 21px;border:1px solid #356bb8;border-radius:21px;background:linear-gradient(135deg,rgba(18,53,106,.9),rgba(6,23,55,.95));transition:transform .18s,border-color .18s;box-shadow:0 10px 27px #0002}
.cambridge-level-card:hover,.cambridge-level-card:focus-visible{transform:translateY(-3px);border-color:#3de3f3}
.cambridge-emoji{font-size:32px}.cambridge-level-card strong{font-size:24px;color:white}.cambridge-tag{display:inline-block;color:#9be9ff;font-size:11px;font-weight:850;letter-spacing:.14em}.cambridge-detail{font-size:13px;color:#b9d1ee}
.cambridge-arrow{margin-top:auto;color:#4be1ee;font-size:13px;font-weight:800}
@media(max-width:790px){.cambridge-level-grid{grid-template-columns:1fr;gap:11px}.cambridge-level-card{min-height:142px;padding:17px}.cambridge-level-card strong{font-size:22px}}

/* V6: top-level Cambridge & E-LAB Workshop groups. All old course URLs unchanged. */
.cards{grid-template-columns:repeat(3,minmax(0,1fr))}
.footer-top{grid-template-columns:2.1fr 1.1fr 1.15fr 1fr}
.workshop-track-panel{margin-top:42px}
.workshop-track-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}
.workshop-track-card{display:flex;flex-direction:column;gap:13px;padding:19px;border:1px solid #36669c;border-radius:18px;background:linear-gradient(140deg,#123668,#0c2145);transition:transform .15s,border-color .15s;min-height:205px}
.workshop-track-card:hover,.workshop-track-card:focus-visible{transform:translateY(-2px);border-color:#51d9ed}
.workshop-track-letter{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,#1b86fe,#03b6d4);font-weight:900;font-size:23px;color:white}
.workshop-track-card strong{font-size:18px;color:white}.workshop-track-card p{font-size:12px;margin:8px 0;color:#bdd4ee}.workshop-track-card small{color:#7beaff;font-weight:750}
@media(max-width:1600px){.nav-contact{display:none}.nav-inner{gap:13px}.site-nav{gap:13px}}
@media(max-width:1250px){.site-nav{display:none;position:absolute;top:100%;left:0;right:0;padding:16px 22px 23px;background:#071935;border-bottom:1px solid #305680;box-shadow:0 18px 40px rgba(0,0,0,.36);flex-direction:column;align-items:stretch;gap:0}.site-nav.open{display:flex}.site-nav a{padding:13px 4px;border-bottom:1px solid var(--stroke);font-size:14px}.menu-toggle{display:block;margin-left:auto}.nav-inner{min-height:70px}.workshop-track-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-top{grid-template-columns:1.3fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:580px){.cards,.workshop-track-grid{grid-template-columns:1fr}.workshop-track-card{min-height:0;flex-direction:row;align-items:flex-start}.workshop-track-letter{flex:0 0 44px}.footer-top{grid-template-columns:1fr 1fr}}