:root{--pink:#d85f7e;--dark:#44383c;--muted:#88777d;--border:#eedfe3;--bg:#fffafb}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font-family:'DM Sans','Noto Sans SC',sans-serif;color:var(--dark)}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #b94b69;outline-offset:3px}.top{height:82px;padding:12px max(5vw,20px);display:flex;justify-content:space-between;align-items:center;background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:5}.brand{display:flex;align-items:center;gap:12px}.mark{width:41px;height:41px;display:grid;place-items:center;border-radius:12px;background:var(--pink);color:white;font-size:21px}.brand strong{display:block;font-size:14px}.brand small{font-size:10px;color:var(--muted)}nav{display:flex;gap:20px;align-items:center}nav>a{font-size:12px;font-weight:700}.languages{display:flex;gap:3px;border:1px solid var(--border);border-radius:30px;padding:4px}.languages button{border:0;background:transparent;padding:7px 12px;border-radius:22px;color:#6d5e64;font-size:11px;font-weight:700}.languages button.active{background:var(--pink);color:white}.hero{max-width:1260px;margin:auto;padding:70px 6vw;display:grid;grid-template-columns:1fr 0.95fr;align-items:center;gap:55px}.eyebrow{color:var(--pink);font-size:11px;font-weight:800;letter-spacing:.15em}.hero h1{font-size:clamp(43px,5.2vw,74px);line-height:1.07;letter-spacing:-.055em;margin:22px 0}.hero h1 em{font-style:normal;color:var(--pink)}.hero p{font-size:16px;line-height:1.9;color:var(--muted);max-width:540px}.hero-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:26px}.primary{background:var(--pink);border:1px solid var(--pink);color:white;border-radius:12px;padding:13px 19px;font-size:13px;font-weight:800}.primary:disabled{opacity:.45;cursor:not-allowed}.pill{border:1px solid var(--border);padding:10px 15px;border-radius:30px;background:white;font-size:11px;font-weight:700;color:var(--muted)}.photo{background:#f8e7ec;overflow:hidden;position:relative}.hero-image{height:430px;border-radius:24px;box-shadow:0 24px 50px #66465215}.photo img{width:100%;height:100%;object-fit:cover;display:block}.photo-placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#b94b69;font-size:28px;font-weight:800;letter-spacing:.18em}.photo-placeholder small{font-size:11px;letter-spacing:.3em}.attribution{position:absolute;bottom:0;left:0;right:0;padding:8px 11px;background:#ffffffeb;color:#554b50;font-size:9px;line-height:1.35}.attribution a{text-decoration:underline}.metrics{background:#fff1f4;display:flex;justify-content:center;gap:60px;padding:20px 16px;color:#a44b67;font-size:12px;font-weight:700;flex-wrap:wrap}.section{max-width:1260px;margin:auto;padding:72px 6vw}.section-top{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}.section-top h2,.footer-note h2{font-size:clamp(26px,3vw,39px);letter-spacing:-.035em;margin:12px 0}.section-top p{max-width:340px;color:var(--muted);font-size:13px;line-height:1.8}.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.topic{background:white;border:1px solid var(--border);border-radius:18px;overflow:hidden;text-align:left;padding:0;transition:transform .2s,box-shadow .2s}.topic:hover{transform:translateY(-4px);box-shadow:0 16px 35px #66465214}.topic .photo{height:160px}.topic-body{padding:19px}.topic small{font-size:10px;color:var(--pink);font-weight:800;letter-spacing:.09em}.topic h3{font-size:18px;margin:10px 0}.topic p{color:var(--muted);font-size:12px;line-height:1.7;min-height:59px}.topic .start{color:#b94b69;font-size:12px;font-weight:800}.practice{border-top:1px solid var(--border)}.lesson-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.text-button{border:0;background:none;color:var(--pink);font-weight:700}.lesson-head{display:grid;grid-template-columns:1fr 300px;gap:25px;align-items:center;margin-bottom:25px}.lesson-head h2{font-size:36px;margin:10px 0}.lesson-head p{color:var(--muted);line-height:1.8}.lesson-image{height:180px;border-radius:17px}.practice-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:22px}.vocab-panel,.quiz-panel{background:white;border:1px solid var(--border);border-radius:19px;padding:25px}.vocab-panel h3{margin-top:0}.muted{color:var(--muted);font-size:12px}.word{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--border);padding:14px 0;gap:10px}.word strong{display:block;font-size:17px}.word small{color:var(--muted);font-size:12px}.word button{border:1px solid var(--border);background:#fff4f6;border-radius:10px;padding:9px 12px}.quiz-header{display:flex;justify-content:space-between;font-size:11px;color:var(--pink);font-weight:800}.quiz-bar{height:6px;border-radius:8px;background:#f8e5eb;margin:17px 0 27px}.quiz-bar span{display:block;height:100%;background:var(--pink);width:0;transition:width .2s}.quiz-panel h3{font-size:21px;line-height:1.5}.answers{display:grid;gap:10px;margin:25px 0}.answer{border:1px solid var(--border);border-radius:12px;padding:13px 15px;background:#fff;text-align:left;color:var(--dark)}.answer.selected{border-color:var(--pink);background:#fff0f4}.answer.correct{border-color:#50966a;background:#effaf2}.answer.wrong{border-color:#cf6666;background:#fff0f0}.feedback{min-height:25px;color:#80646c;font-size:12px}.score{margin-top:20px;background:#fff3f6;padding:18px;border-radius:12px;font-weight:800}.footer-note{text-align:center;border-top:1px solid var(--border)}.footer-note p{max-width:680px;margin:10px auto;color:var(--muted);line-height:1.8}.footer-note .credit{font-size:11px;margin-top:35px}footer{border-top:1px solid var(--border);background:white;display:flex;justify-content:space-between;padding:24px 6vw;color:var(--muted);font-size:12px}@media(max-width:980px){.topic-grid{grid-template-columns:repeat(2,1fr)}.hero{gap:20px}.hero-image{height:350px}}@media(max-width:650px){.top{height:auto;gap:12px;flex-wrap:wrap}nav{width:100%;justify-content:space-between}.hero{grid-template-columns:1fr;padding-top:40px}.hero-image{height:280px}.section-top{display:block}.topic-grid{gap:12px}.topic .photo{height:120px}.topic-body{padding:12px}.topic h3{font-size:15px}.topic p{font-size:11px}.lesson-head,.practice-grid{grid-template-columns:1fr}.lesson-image{height:180px}.metrics{gap:12px}.metrics span{font-size:10px}.section{padding:45px 5vw}}

.study-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:20px 0 32px}.study-link{display:flex;flex-direction:column;gap:12px;padding:30px;border:1px solid #e4e6dd;border-radius:20px;background:#fff;text-decoration:none;color:#294d44;min-height:235px;transition:transform .2s}.study-link:nth-child(2){background:#fff2e9}.study-link:hover{transform:translateY(-4px)}.study-label{font-size:11px;letter-spacing:1.4px;color:#b55b53;font-weight:800}.study-link strong{font-size:27px}.study-link p{color:#63756e;line-height:1.7;margin:0}.study-arrow{font-weight:800;margin-top:auto;font-size:13px}@media(max-width:650px){.study-links{grid-template-columns:1fr}}

/* Fix Vietnamese text spacing */
html[lang="vi"] h1,
html[lang="vi"] h2,
html[lang="vi"] h3,
html[lang="vi"] p,
html[lang="vi"] span,
.hero-title,
.card-title,
.proverb-text {
  letter-spacing: normal;
  word-spacing: normal;
  font-kerning: normal;
  font-variant-ligatures: normal;
}