:root{--green:#174d35;--green2:#246b49;--mint:#e7f2e9;--cream:#fbfaf5;--ink:#24332b;--muted:#69776e;--line:#e2e9e1;--gold:#f2c85b;--peach:#f9e6d8;--lav:#eee9f8;--blue:#e5eff8}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);color:var(--ink);font-family:'Noto Sans Thai','Kanit',sans-serif}.demo-banner{background:#fff2cf;color:#725416;text-align:center;padding:8px 14px;font-size:12px}.topbar{height:auto;min-height:76px;padding:12px max(4vw,20px);display:flex;align-items:center;gap:26px;background:#fff;position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--green);min-width:210px}.brand-mark{width:43px;height:43px;border-radius:14px;background:var(--green);color:white;display:grid;place-items:center;font-weight:700}.brand b{display:block;font-size:17px}.brand small{display:block;font-size:9px;letter-spacing:1.4px;color:#829187}.topbar nav{display:flex;gap:5px;flex:1;align-items:center}.nav-link,.footer-links button{border:0;background:transparent;color:#526258;padding:10px 12px;border-radius:10px;font:inherit;font-size:13px;cursor:pointer}.nav-link:hover,.nav-link.active{background:var(--mint);color:var(--green);font-weight:700}.account-actions{display:flex;align-items:center;gap:10px}.user-label{font-size:12px;color:var(--muted)}.menu-toggle{display:none;border:0;background:var(--mint);padding:9px 12px;border-radius:9px;font-size:20px}.btn{border:0;border-radius:12px;padding:12px 18px;font:inherit;font-weight:600;cursor:pointer;display:inline-flex;justify-content:center;align-items:center;gap:8px;text-decoration:none}.btn-primary{background:var(--green);color:white}.btn-primary:hover{background:var(--green2)}.btn-outline{border:1px solid #cbd9cf;color:var(--green);background:white}.btn-light{background:white;color:var(--green)}.btn:disabled{opacity:.45;cursor:not-allowed}.text-link{border:0;background:transparent;color:var(--green);font:inherit;font-weight:600;cursor:pointer}.section-wrap{width:min(1160px,92%);margin:auto}.hero{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;min-height:510px;padding-top:44px;padding-bottom:30px}.eyebrow{font-size:11px;letter-spacing:1.8px;color:#679174;font-weight:700}.hero h1{font-size:clamp(38px,5vw,58px);line-height:1.23;margin:14px 0;color:#183f2e}.hero h1 em{font-style:normal;color:#bd8c2d}.hero-copy>p{max-width:550px;line-height:1.9;color:var(--muted)}.hero-actions{display:flex;gap:18px;align-items:center;margin:26px 0}.hero-stats{display:flex;gap:28px;margin-top:36px}.hero-stats b,.hero-stats small{display:block}.hero-stats b{font-size:14px;color:var(--green)}.hero-stats small{font-size:11px;color:var(--muted);margin-top:3px}.hero-art{height:420px;position:relative;display:grid;place-items:end center}.hero-art img{height:100%;max-width:90%;object-fit:contain;position:relative;z-index:1;mix-blend-mode:multiply}.sun-shape{position:absolute;width:340px;height:340px;border-radius:50%;background:#e8f1df;top:38px;left:50%;transform:translateX(-50%)}.speech{position:absolute;right:0;top:55px;background:white;border:1px solid var(--line);border-radius:18px;padding:13px 17px;box-shadow:0 8px 25px #173c2510;z-index:2;font-size:13px}.intro-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;background:white;border:1px solid var(--line);border-radius:18px;padding:20px 25px}.intro-strip>div{display:flex;gap:13px;align-items:center}.strip-icon{font-size:25px}.intro-strip p{margin:0}.intro-strip b,.intro-strip small{display:block}.intro-strip b{font-size:14px}.intro-strip small{font-size:11px;color:var(--muted);margin-top:4px}.content-section{padding-top:68px;padding-bottom:68px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:25px}.section-heading h2{font-size:30px;color:var(--green);margin:6px 0}.section-heading p{color:var(--muted);margin:0;font-size:14px}.category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.category-card{background:white;border:1px solid var(--line);border-radius:16px;padding:20px;min-height:205px}.category-card h3{font-size:16px;margin:14px 0 8px}.category-card p{font-size:12px;line-height:1.8;color:var(--muted);min-height:44px}.category-card button,.category-card>a{border:0;background:none;padding:0;color:var(--green);font:inherit;font-size:12px;font-weight:700;cursor:pointer;text-decoration:none}.category-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:13px;font-size:22px}.mint{background:var(--mint)}.peach{background:var(--peach)}.yellow{background:#fff3cf}.lavender{background:var(--lav)}.blue{background:var(--blue)}.lesson-band{background:#edf4e9;padding:55px 0}.lesson-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:center}.lesson-layout h2{font-size:34px;line-height:1.3;color:var(--green);margin:10px 0}.lesson-layout p{line-height:1.9;color:#5e6f62;font-size:14px}.check-list{padding-left:20px;color:#4f6857;line-height:2;font-size:13px}.lesson-image img{width:100%;display:block;border-radius:16px;box-shadow:0 10px 30px #183d2412}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.feature-grid article{padding:23px;border-radius:16px;border:1px solid var(--line);background:#fff}.feature-grid b{color:var(--green)}.feature-grid p{font-size:13px;color:var(--muted);line-height:1.8;margin-bottom:0}.page{display:none;min-height:60vh}.page.active{display:block}.compact{margin-top:25px;grid-template-columns:repeat(4,1fr)}.lesson-feature{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;background:white;border:1px solid var(--line);border-radius:20px;padding:20px}.lesson-feature img{width:100%;border-radius:12px}.lesson-feature h2{color:var(--green)}.lesson-feature p{font-size:14px;line-height:1.9;color:var(--muted)}.pill{display:inline-block;background:var(--mint);color:var(--green);border-radius:30px;padding:5px 10px;font-size:11px}.exam-builder{background:white;border:1px solid var(--line);border-radius:20px;padding:26px;max-width:900px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.form-grid>label{font-size:13px;font-weight:700;color:#43564a}.form-grid select{display:block;width:100%;margin-top:8px;padding:12px;border:1px solid #d8e2d9;border-radius:10px;background:#fff;color:var(--ink);font:inherit;font-size:14px}.wide{grid-column:1/-1}.choice-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}.choice{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);border-radius:13px;padding:15px;cursor:pointer}.choice:has(input:checked){border-color:var(--green);background:#f1f7f1}.choice input{accent-color:var(--green);margin-top:6px}.choice span{font-size:14px}.choice small{display:block;color:var(--muted);font-size:11px;font-weight:400;margin-top:4px}.exam-summary{background:#f3f7f1;border-radius:12px;padding:15px;margin:20px 0 12px;font-size:13px}.exam-summary b,.exam-summary span{display:block}.exam-summary span{margin-top:5px;color:var(--green)}.exam-summary p{color:var(--muted);margin-bottom:0}.notice-box{background:#fff6dc;border:1px solid #f0dfaa;color:#705c25;border-radius:12px;padding:14px 16px;font-size:13px;line-height:1.8;margin:15px 0}.exam-workspace{margin-top:20px;background:white;border:1px solid var(--line);border-radius:18px;padding:24px}.exam-workspace h3{color:var(--green)}.exam-meta{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:13px}.timer{font-size:20px;font-weight:700;color:#b14d37}.question-card{border-top:1px solid var(--line);padding:18px 0}.question-card p{font-weight:600}.answer-option{display:block;border:1px solid var(--line);border-radius:10px;padding:11px 13px;margin:8px 0;font-size:14px;cursor:pointer}.answer-option:has(input:checked){background:var(--mint);border-color:var(--green)}.answer-option input{accent-color:var(--green);margin-right:8px}.exam-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:15px}.attempt-list{display:grid;gap:10px}.attempt-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 17px;display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:13px}.attempt-item small{display:block;color:var(--muted)}.empty-state{background:white;border:1px dashed #cbd9cf;padding:22px;border-radius:12px;color:var(--muted);font-size:13px}.subheading{margin-top:50px}.leaderboard-card{max-width:750px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px 22px}.leader-row{display:grid;grid-template-columns:80px 1fr 120px;align-items:center;padding:15px 5px;border-bottom:1px solid var(--line);font-size:14px}.leader-row:last-child{border:0}.leader-head{font-size:12px;color:var(--muted)}.rank{font-size:18px}.gold{color:#c28d22}.silver{color:#87949b}.bronze{color:#ae7652}.demo-note{font-size:11px;color:var(--muted)}footer{text-align:center;background:#173f2d;color:#e7f0e9;padding:35px 15px}footer p{font-size:13px;color:#c6d7ca}.footer-brand{font-size:20px;font-weight:700}.footer-brand span{color:#f0c75a}.footer-links{margin-top:12px}.footer-links button{color:#d7e6da}.modal-backdrop{position:fixed;inset:0;background:#10271dcc;display:grid;place-items:center;padding:18px;z-index:50}.hidden{display:none!important}.auth-modal,.rules-modal{position:relative;background:#fff;border-radius:20px;padding:30px;width:min(520px,100%);max-height:90vh;overflow:auto}.auth-modal h2,.rules-modal h2{color:var(--green);margin:8px 0}.auth-modal p,.rules-modal p,.rules-modal li{font-size:13px;line-height:1.8;color:var(--muted)}.auth-status{padding:12px;background:#f1f6f0;border-radius:10px;font-size:12px;margin:15px 0}.modal-close{position:absolute;right:15px;top:10px;border:0;background:transparent;font-size:26px;cursor:pointer;color:#637368}.full{width:100%;margin-top:10px}.confirm-check{display:flex;gap:8px;align-items:center;font-size:13px;margin:20px 0}.confirm-check input{accent-color:var(--green)}
@media(max-width:1000px){.topbar{gap:12px;flex-wrap:wrap}.topbar nav{order:4;width:100%;overflow:auto}.category-grid{grid-template-columns:repeat(3,1fr)}.brand{min-width:170px}.nav-link{white-space:nowrap}}@media(max-width:700px){.topbar{padding:10px 4%;}.menu-toggle{display:block;margin-left:auto}.topbar nav{display:none;flex-direction:column;align-items:stretch;order:5}.topbar nav.open{display:flex}.nav-link{text-align:left}.account-actions{width:100%;justify-content:space-between;order:6}.hero{grid-template-columns:1fr;padding-top:35px}.hero-art{height:300px;grid-row:1}.hero-art img{max-height:290px}.sun-shape{width:250px;height:250px}.speech{right:4%;top:20px}.hero h1{font-size:42px}.hero-stats{gap:13px;flex-wrap:wrap}.intro-strip{grid-template-columns:1fr}.category-grid,.compact{grid-template-columns:1fr 1fr}.lesson-layout,.lesson-feature{grid-template-columns:1fr}.lesson-image{order:-1}.feature-grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.wide{grid-column:auto}.choice-row{grid-template-columns:1fr}.content-section{padding-top:45px;padding-bottom:45px}.section-heading h2{font-size:25px}.attempt-item{align-items:flex-start;flex-direction:column}.leader-row{grid-template-columns:50px 1fr 80px;font-size:12px}}@media(max-width:390px){.category-grid,.compact{grid-template-columns:1fr}.hero h1{font-size:36px}}
@media print{body{background:#fff}.demo-banner,.topbar,footer,.exam-builder,.exam-actions,.modal-backdrop{display:none!important}.page{display:none!important}#page-exam{display:block!important}.exam-workspace{display:block!important;border:0;padding:0}.exam-workspace .timer{display:none}.question-card{break-inside:avoid}.answer-option{border:1px solid #aaa}.print-heading{display:block!important}}
/* additions for the complete navigation prototype */
.brand img{width:48px;height:48px;object-fit:contain;border-radius:12px;background:#f2f7f0}.section-wrap{width:min(1160px,92%);margin-left:auto;margin-right:auto}.hero-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.hero-stats{display:flex;gap:28px;margin-top:28px}.hero-stats b,.hero-stats small{display:block}.hero-stats b{font-size:13px;color:var(--green)}.hero-stats small{font-size:11px;color:var(--muted)}.hero-art{position:relative;display:grid;place-items:center;min-height:390px}.hero-art img{position:relative;z-index:1;max-height:360px;max-width:100%;object-fit:contain}.sun-shape{position:absolute;width:320px;height:320px;border-radius:50%;background:#f4e9c9}.speech{position:absolute;z-index:2;right:0;top:35px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px 16px;font-size:13px;box-shadow:0 8px 25px #173c2510}.intro-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px 25px}.intro-strip>div{display:flex;gap:13px;align-items:center}.intro-strip p{margin:0}.intro-strip b,.intro-strip small{display:block}.intro-strip b{font-size:14px}.intro-strip small{font-size:11px;color:var(--muted);margin-top:4px}.category-card>span:first-child{display:inline-grid;place-items:center;width:43px;height:43px;border-radius:13px;background:var(--mint);font-size:22px}.category-card button{border:0;background:none;padding:0;color:var(--green);font:inherit;font-size:12px;font-weight:700;cursor:pointer}.lesson-band{background:#edf4e9;padding:55px 0}.lesson-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:center}.lesson-layout h2{font-size:34px;line-height:1.3;color:var(--green);margin:10px 0}.lesson-layout p{line-height:1.9;color:#5e6f62;font-size:14px}.lesson-layout>img{width:100%;display:block;border-radius:16px}.page{display:none;min-height:60vh}.page.active{display:block}.lesson-feature{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}.lesson-feature img{width:100%;border-radius:12px}.lesson-feature h2{color:var(--green)}.lesson-feature p{font-size:14px;line-height:1.9;color:var(--muted)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.feature-grid article{padding:23px;border-radius:16px;border:1px solid var(--line);background:#fff}.feature-grid b{color:var(--green)}.feature-grid p{font-size:13px;color:var(--muted);line-height:1.8;margin-bottom:0}.exam-builder{background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px;max-width:900px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.form-grid>label{font-size:13px;font-weight:700;color:#43564a}.form-grid select{display:block;width:100%;margin-top:8px;padding:12px;border:1px solid #d8e2d9;border-radius:10px;background:#fff;color:var(--ink);font:inherit;font-size:14px}.wide{grid-column:1/-1}.form-grid fieldset{border:0;padding:0;margin:0}.form-grid legend{font-size:13px;font-weight:700}.choice-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}.choice{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);border-radius:13px;padding:15px;cursor:pointer}.choice:has(input:checked){border-color:var(--green);background:#f1f7f1}.choice input{accent-color:var(--green);margin-top:6px}.choice span{font-size:14px}.choice small{display:block;color:var(--muted);font-size:11px;font-weight:400;margin-top:4px}.exam-summary{background:#f3f7f1;border-radius:12px;padding:15px;margin:20px 0 12px;font-size:13px}.exam-summary b,.exam-summary span{display:block}.exam-summary span{margin-top:5px;color:var(--green)}.exam-summary p{color:var(--muted);margin-bottom:0}.notice-box{background:#fff6dc;border:1px solid #f0dfaa;color:#705c25;border-radius:12px;padding:14px 16px;font-size:13px;line-height:1.8;margin:15px 0}.exam-workspace{margin-top:20px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px}.exam-workspace h3{color:var(--green)}.exam-meta{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:13px}.timer{font-size:20px;font-weight:700;color:#b14d37}.question-card{border-top:1px solid var(--line);padding:18px 0}.question-card p{font-weight:600}.answer-option{display:block;border:1px solid var(--line);border-radius:10px;padding:11px 13px;margin:8px 0;font-size:14px;cursor:pointer}.answer-option:has(input:checked){background:var(--mint);border-color:var(--green)}.answer-option input{accent-color:var(--green);margin-right:8px}.exam-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:15px}.attempt-list{display:grid;gap:10px}.attempt-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 17px;display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:13px}.attempt-item small{display:block;color:var(--muted)}.empty-state{background:#fff;border:1px dashed #cbd9cf;padding:22px;border-radius:12px;color:var(--muted);font-size:13px}.subheading{margin-top:50px}.pill{display:inline-block;background:var(--mint);color:var(--green);border-radius:30px;padding:5px 10px;font-size:11px}.demo-note{font-size:11px;color:var(--muted)}.modal-backdrop{position:fixed;inset:0;background:#10271dcc;display:grid;place-items:center;padding:18px;z-index:50}.hidden{display:none!important}.auth-modal,.rules-modal{position:relative;background:#fff;border-radius:20px;padding:30px;width:min(520px,100%);max-height:90vh;overflow:auto}.auth-modal h2,.rules-modal h2{color:var(--green);margin:8px 0}.auth-modal p,.rules-modal p,.rules-modal li{font-size:13px;line-height:1.8;color:var(--muted)}.auth-status{padding:12px;background:#f1f6f0;border-radius:10px;font-size:12px;margin:15px 0}.modal-close{position:absolute;right:15px;top:10px;border:0;background:transparent;font-size:26px;cursor:pointer;color:#637368}.full{width:100%;margin-top:10px}.confirm-check{display:flex;gap:8px;align-items:center;font-size:13px;margin:20px 0}.confirm-check input{accent-color:var(--green)}
@media(max-width:1000px){.topbar{gap:12px;flex-wrap:wrap}.topbar nav{order:4;width:100%;overflow:auto}.brand{min-width:170px}.nav-link{white-space:nowrap}}@media(max-width:700px){.topbar{padding:10px 4%}.menu-toggle{display:block;margin-left:auto}.topbar nav{display:none;flex-direction:column;align-items:stretch;order:5}.topbar nav.open{display:flex}.account-actions{width:100%;justify-content:space-between;order:6}.hero{grid-template-columns:1fr;padding-top:35px}.hero-art{height:300px;grid-row:1;min-height:280px}.hero-art img{max-height:270px}.sun-shape{width:240px;height:240px}.speech{right:4%;top:15px}.hero h1{font-size:42px}.hero-stats{gap:13px;flex-wrap:wrap}.intro-strip{grid-template-columns:1fr}.category-grid{grid-template-columns:1fr 1fr}.lesson-layout,.lesson-feature{grid-template-columns:1fr}.feature-grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.wide{grid-column:auto}.choice-row{grid-template-columns:1fr}.content-section{padding-top:45px;padding-bottom:45px}.section-heading h2{font-size:25px}.attempt-item{align-items:flex-start;flex-direction:column}}@media(max-width:390px){.category-grid{grid-template-columns:1fr}.hero h1{font-size:36px}}

/* Mobile navigation: right-side slide-in drawer */
@media(min-width:701px){.drawer-heading{display:none}.topbar nav{align-items:center}.drawer-account{display:flex;align-items:center;gap:10px;margin-left:auto;padding-left:10px}.menu-backdrop{display:none}}
@media(max-width:700px){
  .topbar{height:76px;min-height:76px;flex-wrap:nowrap;justify-content:space-between;gap:12px;padding:10px 4%;}
  .brand{min-width:0;gap:10px}.brand-mark{width:44px;height:44px;flex:0 0 44px}.brand b{font-size:16px}.brand small{font-size:8px;letter-spacing:1.2px}
  .menu-toggle{display:grid;place-items:center;width:46px;height:46px;margin:0 0 0 auto;flex:0 0 46px;border:0;border-radius:13px;background:var(--mint);color:var(--green);font-size:23px;cursor:pointer;z-index:42}
  .topbar nav#mainNav{display:flex;position:fixed;z-index:41;top:0;right:0;bottom:0;width:min(84vw,340px);height:100dvh;overflow-y:auto;overscroll-behavior:contain;flex-direction:column;align-items:stretch;gap:7px;padding:24px 18px calc(24px + env(safe-area-inset-bottom));background:#fff;box-shadow:-18px 0 50px #173c2520;transform:translateX(105%);visibility:hidden;transition:transform .28s ease,visibility .28s ease;border-radius:22px 0 0 22px;}
  .topbar nav#mainNav.open{transform:translateX(0);visibility:visible}
  .drawer-heading{display:flex;align-items:center;justify-content:space-between;padding:4px 4px 18px;margin-bottom:8px;border-bottom:1px solid var(--line);color:var(--green);font-size:19px}
  .drawer-heading button{width:38px;height:38px;border:0;border-radius:50%;background:#f1f5f1;color:var(--green);font-size:27px;line-height:1;cursor:pointer}
  .topbar nav#mainNav .nav-link{display:flex;align-items:center;min-height:49px;width:100%;padding:12px 15px;text-align:left;border-radius:12px;font-size:15px;color:#526258;background:transparent}
  .topbar nav#mainNav .nav-link.active{background:var(--mint);color:var(--green);font-weight:700}
  .drawer-account{display:flex;flex-direction:column;align-items:stretch;gap:12px;margin-top:auto;padding:20px 4px 4px;border-top:1px solid var(--line)}
  .drawer-account .user-label{font-size:13px}.drawer-account .btn{width:100%;min-height:46px}
  .menu-backdrop{position:fixed;inset:0;z-index:40;background:#10271d80;opacity:0;visibility:hidden;transition:opacity .28s ease,visibility .28s ease}
  .menu-backdrop.show{opacity:1;visibility:visible}
  body.menu-open{overflow:hidden}
  .account-actions{display:none}
}
@media(prefers-reduced-motion:reduce){.topbar nav#mainNav,.menu-backdrop{transition:none}}


/* Fix: hide the header hamburger while the right-side drawer is open */
@media (max-width:700px){
  body.menu-open .menu-toggle{
    visibility:hidden !important;
    opacity:0 !important;
    pointer-events:none !important;
  }
}