@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=DM+Serif+Display:ital@0;1&display=swap');
:root{--ink:#273b35;--muted:#66766d;--accent:#bd5c76;--mint:#eaf3ed;--cream:#fffaf6;--line:#e9e8e1;--gold:#f5e7b9}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);font-family:"DM Sans",Arial,sans-serif;color:var(--ink);line-height:1.6}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button{cursor:pointer}.site-header{height:85px;display:flex;justify-content:space-between;align-items:center;max-width:1240px;padding:0 30px;margin:auto}.brand{display:flex;align-items:center;gap:12px}.brand-mark{display:grid;place-items:center;width:45px;height:45px;background:#f4d9e1;border-radius:14px;font-family:"DM Serif Display",serif;font-size:27px;color:#b54e6b}.brand strong{display:block;font-size:15px;line-height:1.3}.brand small{display:block;font-size:11px;color:#859087}.back{font-size:13px;font-weight:700;color:#627369}.back:hover{color:var(--accent)}main{max-width:1240px;margin:auto;padding:20px 30px 0}.hero{min-height:490px;border-radius:24px;background:#eaf2ed;display:grid;grid-template-columns:1.35fr .8fr;gap:35px;align-items:center;padding:65px 76px;overflow:hidden}.eyebrow{letter-spacing:.17em;font-weight:800;color:#69877b;font-size:11px;margin:0 0 16px}.hero h1{font-size:clamp(48px,5.2vw,75px);line-height:1.09;letter-spacing:-.055em;margin:0 0 24px;font-weight:800}.hero h1 em{font-family:"DM Serif Display",Georgia,serif;font-weight:400;color:#be5d78;letter-spacing:-.025em}.hero p:not(.eyebrow){max-width:540px;color:#64766c;font-size:15px}.hero-actions,.speaking-buttons{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.btn{border:1px solid transparent;border-radius:11px;padding:13px 20px;font-weight:750;font-size:13px;display:inline-flex;align-items:center;justify-content:center;gap:7px}.primary{background:#345d4f;color:#fff}.primary:hover{background:#244739}.secondary{background:#fff;border-color:#d8e5dd;color:#365c4c}.secondary:hover{background:#f7faf7}.stats{display:flex;gap:25px;flex-wrap:wrap;margin-top:43px}.stats span{font-size:12px;color:#6a8074}.stats b{font-size:17px;color:#385f51;margin-right:5px}.hero-graphic{background:#fffdf8;border:1px solid #e9e3d6;border-radius:13px;min-height:320px;transform:rotate(3deg);box-shadow:13px 14px 0 #d8e5db;padding:30px;display:flex;flex-direction:column;justify-content:space-between}.graphic-caption,.graphic-bottom{font-size:10px;font-weight:800;letter-spacing:.15em;color:#859b8c;display:flex;justify-content:space-between}.graphic-title{font-family:"DM Serif Display",Georgia,serif;font-size:clamp(65px,8vw,105px);color:#456e5e;text-align:center;line-height:1}.graphic-title span{color:#d88ca0}.graphic-lines{display:grid;gap:6px;color:#b1b7a8;font-size:12px;text-align:center}.graphic-bottom{border-top:1px solid #e7e8df;padding-top:13px}.section-nav{display:flex;gap:8px;overflow-x:auto;padding:25px 0 0;border-bottom:1px solid var(--line)}.section-nav a{font-size:13px;font-weight:700;padding:12px 18px;white-space:nowrap;border-radius:10px 10px 0 0;color:#718077}.section-nav a:hover{background:#edf4ee;color:#345b4c}.section{padding:85px 0 25px;scroll-margin-top:15px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:26px}.section-heading h2,.progress-section h2{font-size:clamp(31px,3.5vw,45px);letter-spacing:-.045em;line-height:1.2;margin:0 0 12px}.section-heading p:not(.eyebrow),.progress-section p:not(.eyebrow){max-width:700px;color:#758179;margin:0;font-size:14px}.count-label{border-radius:99px;background:#f1e7eb;color:#a65b70;padding:8px 13px;white-space:nowrap;font-size:12px;font-weight:750}.filters{display:grid;grid-template-columns:1.7fr 1fr 1fr;gap:12px;margin-bottom:22px}.filters select,.search-wrap{border:1px solid #e1e5df;background:#fff;border-radius:12px;height:50px;padding:0 14px;color:#42564a;min-width:0}.search-wrap{display:flex;align-items:center;gap:10px}.search-wrap span{font-size:23px;color:#a3afa5}.search-wrap input{border:0;outline:0;width:100%;background:transparent;min-width:0}.grammar-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.topic-card{background:#fff;border:1px solid #e7e8e2;border-radius:15px;padding:20px 22px;transition:box-shadow .2s}.topic-card:hover{box-shadow:0 12px 24px #304e3c0a}.topic-top{display:flex;justify-content:space-between;align-items:center;gap:10px}.topic-category{font-size:10px;color:#9b6675;letter-spacing:.09em;text-transform:uppercase;font-weight:800}.topic-level{font-size:10px;border-radius:5px;background:#f0f5f0;color:#5b7c67;padding:4px 8px;font-weight:800}.topic-card h3{font-size:17px;letter-spacing:-.02em;margin:11px 0 6px}.topic-card>p{color:#748177;font-size:13px;margin:0 0 14px}.topic-toggle{background:none;border:0;color:#b55470;font-size:12px;font-weight:800;padding:0}.topic-details{display:none;margin-top:15px;border-top:1px solid #eeeae6;padding-top:14px}.topic-card.open .topic-details{display:block}.example{background:#f6f8f4;padding:14px;border-radius:9px;font-size:13px}.example small{display:block;font-size:10px;color:#8d9b8f;font-weight:800;letter-spacing:.08em}.topic-check{display:flex;align-items:center;gap:9px;margin-top:14px;font-size:12px;font-weight:700;color:#527260}.topic-check input{accent-color:#426f5a;width:17px;height:17px}.practice-section{padding-top:110px}.quiz-layout{display:grid;grid-template-columns:1.5fr .65fr;gap:18px}.quiz-card,.quiz-aside,.speaking-card,.speaking-tips{border:1px solid #e8e8e0;border-radius:18px;padding:32px;background:#fff}.quiz-top{display:flex;justify-content:space-between;color:#9a6875;font-size:11px;font-weight:800;letter-spacing:.1em}.quiz-card h3{font-size:24px;margin:24px 0}.quiz-options{display:grid;gap:10px}.quiz-option{background:#fafbf9;text-align:left;border:1px solid #e4e9e3;border-radius:10px;padding:16px 18px;color:#41594a}.quiz-option:hover:not(:disabled){border-color:#81ab91}.quiz-option.correct{background:#e6f4e9;border-color:#7db88e}.quiz-option.incorrect{background:#fff0f1;border-color:#d9949f}.feedback{min-height:24px;font-size:13px;font-weight:650}.quiz-aside{background:#f4eadb;display:flex;flex-direction:column;justify-content:center}.aside-number{font-family:"DM Serif Display",serif;font-size:120px;line-height:1;color:#c78f7d}.quiz-aside h3{font-size:26px;margin:8px 0}.quiz-aside p{font-size:13px;color:#887d70}.aside-graphic{display:flex;gap:7px;margin-top:15px}.aside-graphic span{background:#fff8f0;padding:7px 10px;border-radius:8px;font-size:11px;font-weight:800;color:#ad8072}.speaking-grid{display:grid;grid-template-columns:1.4fr .7fr;gap:18px}.speaking-card{background:#f0f5ee}.mini-label{font-size:10px;letter-spacing:.15em;font-weight:800;color:#799080}.speaking-card h3{font-size:27px;margin:16px 0 6px}.speaking-card>p{font-size:14px;color:#6f8074}.model-sentence{background:#fff;border-radius:11px;border:1px solid #e0e9dd;padding:22px;margin-top:20px;font-size:20px;font-weight:650}.speaking-note{font-size:11px!important}.speaking-tips h3{font-size:20px;margin:0 0 26px}.speaking-tips>div{display:flex;gap:15px;padding:16px 0;border-bottom:1px solid #eef0eb;font-size:13px;color:#6c7b71}.speaking-tips b{color:#bc6d80}.progress-section{background:#f6efe9;margin:90px 0 45px;border-radius:19px;padding:45px;display:grid;grid-template-columns:1fr 1fr;gap:45px;align-items:center}.progress-widget{background:#fff;border-radius:14px;padding:25px}.progress-top{display:flex;justify-content:space-between;font-size:14px;margin-bottom:16px}.progress-track{height:11px;border-radius:99px;background:#e7eee6;overflow:hidden}.progress-track>div{height:100%;background:#588b6e;width:0;transition:width .3s}.text-button{background:none;border:0;color:#a36678;font-size:12px;font-weight:750;padding:12px 0 0}footer{max-width:1240px;margin:auto;padding:25px 30px 50px;display:flex;justify-content:space-between;gap:15px;border-top:1px solid #e7e8e1;font-size:12px;color:#8b978d}@media(max-width:900px){.hero{padding:45px;grid-template-columns:1fr .8fr}.hero-graphic{min-height:270px}.grammar-list{grid-template-columns:1fr}.quiz-layout,.speaking-grid{grid-template-columns:1fr 1fr}}@media(max-width:650px){.site-header{padding:0 18px}.back{font-size:11px}main{padding:10px 16px}.hero{grid-template-columns:1fr;padding:40px 26px}.hero-graphic{display:none}.hero h1{font-size:48px}.stats{gap:13px}.section{padding-top:65px}.section-heading{align-items:start;flex-direction:column}.filters{grid-template-columns:1fr}.quiz-layout,.speaking-grid,.progress-section{grid-template-columns:1fr}.quiz-card,.quiz-aside,.speaking-card,.speaking-tips{padding:23px}.progress-section{padding:23px;gap:20px}.section-nav a{padding:10px 12px}footer{flex-direction:column;padding:25px 16px}}
/* Detailed lesson layouts */
.grammar-list{grid-template-columns:1fr 1fr;align-items:start}.topic-card{overflow:hidden}.topic-card.open{grid-column:span 2;border-color:#cadfd2;box-shadow:0 15px 45px rgba(38,69,54,.07)}.topic-card.open .topic-details{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.lesson-block{background:#fbfcfa;border:1px solid #e7eee8;border-radius:13px;padding:20px}.lesson-kicker{display:block;font-size:10px;letter-spacing:.11em;color:#658775;font-weight:800;margin-bottom:12px}.lesson-block p,.lesson-block li{font-size:14px;line-height:1.8;color:#3b5448;margin:8px 0}.formula{font-size:19px;font-weight:800;color:#2d5c49;line-height:1.5}.vi-note{padding:12px 14px;border-left:3px solid #d987a1;background:#fff6f8;border-radius:0 8px 8px 0}.bilingual-example{display:flex;flex-direction:column;gap:4px;border-bottom:1px solid #e8ece7;padding:10px 0}.bilingual-example:last-child{border:0}.bilingual-example strong{font-size:14px;color:#253f32}.bilingual-example span{font-size:13px;color:#7c817c}.lesson-block.mistake{background:#fff9f4}.topic-check{grid-column:1/-1}.hero-graphic .graphic-lines{text-align:left;gap:13px;font-size:13px;color:#496659}.hero-graphic .graphic-lines span{border-bottom:1px solid #e5eae1;padding:8px 0}.hero-graphic .graphic-lines b{color:#b85874}.hero-graphic .graphic-title{font-size:clamp(55px,6vw,85px)}@media(max-width:900px){.topic-card.open{grid-column:span 1}.topic-card.open .topic-details{grid-template-columns:1fr}}

/* Vocabulary library */
.vocab-levels{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:17px}.vocab-levels button{border:1px solid #e0e6df;background:white;color:#577064;border-radius:9px;padding:10px 14px;font-size:12px;font-weight:750}.vocab-levels button.active{background:#345d4f;color:white;border-color:#345d4f}.vocab-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:22px}.vocab-tools>input{flex:1;min-width:220px;padding:13px 16px;border:1px solid #e0e6df;border-radius:10px;background:#fff}.vocab-tools label{font-size:12px;color:#687d6f}.vocab-tools label input{accent-color:#345d4f}.vocab-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.vocab-card{padding:21px;background:white;border:1px solid #e7e9e2;border-radius:15px}.vocab-card-top,.vocab-word-line{display:flex;align-items:center;justify-content:space-between;gap:10px}.vocab-card-top>span{font-size:11px;font-weight:800;color:#a95d76;background:#f9edf1;padding:4px 9px;border-radius:6px}.vocab-save,.vocab-audio{border:0;background:transparent;color:#6b8977;font-size:12px;font-weight:750}.vocab-save.is-saved{color:#bb5673}.vocab-word-line h3{font-size:23px;margin:14px 0 4px;letter-spacing:-.03em}.vocab-meaning{font-size:14px;color:#b25875;margin:0 0 16px}.vocab-example{background:#f7f9f5;border-radius:10px;padding:12px 13px;font-size:13px;color:#4e6255}.vocab-example small{display:block;font-size:9px;letter-spacing:.12em;font-weight:800;color:#8d9e90;margin-bottom:5px}.vocab-disclaimer{font-size:12px;color:#859188;margin-top:19px}.vocab-flash{background:#eaf2ed;border:1px solid #d7e5d9;padding:30px;border-radius:18px;text-align:center;margin-bottom:22px}.vocab-flash[hidden]{display:none}.vocab-flash-top{display:flex;justify-content:space-between;color:#648170;font-size:11px;letter-spacing:.12em;font-weight:800}.vocab-flash-top button{border:0;background:transparent;color:#567064;font-size:17px}.vocab-flash h3{font-size:clamp(36px,5vw,60px);margin:13px}.vocab-flash p{margin:7px;color:#667e6c}.vocab-flash #vocabFlashMeaning{color:#b25875;font-size:20px;font-weight:700}.vocab-flash-actions{display:flex;gap:10px;justify-content:center;margin-top:22px}@media(max-width:900px){.vocab-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.vocab-grid{grid-template-columns:1fr}.vocab-tools>input{min-width:100%}.vocab-flash{padding:20px}}

.vocab-quiz{background:#f5eee8;border:1px solid #e9dfd4;padding:30px;border-radius:18px;margin-bottom:24px}.vocab-quiz[hidden]{display:none}.vocab-quiz h3{font-size:25px}.vocab-quiz-answers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:18px 0}.vocab-quiz-answers button{padding:15px;border-radius:10px;background:white;border:1px solid #e4ded8;text-align:left;color:#334e42}.vocab-quiz-answers button.correct{background:#def1e4;border-color:#76b98a}.vocab-quiz-answers button.incorrect{background:#ffebed;border-color:#d98b9b}.vocab-quiz #vocabQuizFeedback{font-size:13px;min-height:24px}@media(max-width:600px){.vocab-quiz-answers{grid-template-columns:1fr}}
.vocab-dashboard{display:grid;grid-template-columns:repeat(3,1fr) auto;align-items:center;gap:12px;background:#f0f5ee;border:1px solid #dce9dd;border-radius:15px;padding:17px 20px;margin:0 0 18px}.vocab-dashboard>div{display:flex;flex-direction:column}.vocab-dashboard strong{font-size:27px;color:#315b49}.vocab-dashboard small{font-size:11px;color:#738578}.vocab-tools select{border:1px solid #e0e6df;background:#fff;padding:13px;border-radius:10px;max-width:220px}.vocab-card-top>span{font-size:10px}.vocab-ipa{font-size:12px;color:#748d7c;margin:0 0 8px}.vocab-example-vi{margin:8px 0 0;color:#9b6174;font-size:12px}.vocab-collocations{font-size:12px;color:#627969;margin:14px 0 0}.vocab-review-label{font-size:11px;color:#8c9b8f;margin:13px 0 0}.vocab-grade-buttons{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:18px 0}.vocab-grade-buttons[hidden]{display:none}.vocab-grade-buttons button{border:1px solid #c8dfd0;background:#fff;border-radius:9px;padding:10px 13px;font-weight:750;color:#365d4b;font-size:12px}.vocab-grade-buttons button:hover{background:#d7ebdc}@media(max-width:750px){.vocab-dashboard{grid-template-columns:repeat(3,1fr)}.vocab-dashboard>.btn{grid-column:1/-1}}@media(max-width:450px){.vocab-dashboard{grid-template-columns:repeat(2,1fr)}.vocab-dashboard>.btn{grid-column:1/-1}}

/* American–Vietnamese CEFR course navigator */
:root{--navy:#163552;--crimson:#ba4549;--paper:#fffdfa;--quiet:#637582}
.level-section-head{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:center;margin:22px 0 15px;font-size:11px;letter-spacing:.09em;font-weight:800;color:var(--navy)}
.level-section-head span:last-child{color:var(--quiet);font-weight:500;letter-spacing:0}
.cefr-cards{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin-bottom:23px}
.cefr-card{display:flex;flex-direction:column;align-items:flex-start;text-align:left;min-height:175px;padding:19px 17px;border:1px solid #dbe4e8;border-radius:16px;background:var(--paper);color:var(--navy);box-shadow:0 6px 22px #1735520a;transition:transform .2s,border-color .2s,box-shadow .2s;cursor:pointer}
.cefr-card:hover{transform:translateY(-3px);box-shadow:0 10px 26px #17355217}
.cefr-card[aria-pressed=true]{border:2px solid var(--crimson);background:#fff6f2}
.cefr-card .cefr-number{font-family:Georgia,serif;font-size:39px;line-height:1.1;font-weight:700;letter-spacing:-.05em}
.cefr-card .cefr-name{font-size:12px;font-weight:800;margin-top:9px}
.cefr-card .cefr-vi{font-size:11px;color:var(--quiet);margin-top:4px}
.cefr-card .cefr-count{margin-top:auto;padding-top:15px;font-size:11px;color:var(--crimson);font-weight:800}
.level-selected-bar{display:flex;justify-content:space-between;align-items:center;gap:15px;flex-wrap:wrap;padding:16px 19px;margin:10px 0 19px;background:#f1f5f6;border:1px solid #dbe5e6;border-radius:13px;color:var(--navy)}
.level-selected-bar[hidden],#grammarLibraryBody[hidden],#vocabLibraryBody[hidden]{display:none!important}
.level-selected-bar button{border:0;background:transparent;color:var(--crimson);font-weight:800;cursor:pointer}
#vocabLevels{display:none!important}
#grammarLibraryBody .filters{margin-top:12px}
@media(max-width:950px){.cefr-cards{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:580px){.cefr-cards{grid-template-columns:repeat(2,minmax(0,1fr))}.cefr-card{min-height:150px;padding:15px}.level-section-head span:last-child{display:none}}