:root{--navy:#153a54;--blue:#4d91c6;--sky:#eaf6ff;--gold:#e6a53b;--cream:#fffaf0;
--ink:#24333e;--muted:#667580;--line:#cfe1ec;--shadow:0 18px 42px rgba(26,62,84,.14)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Tahoma,"Noto Sans Thai",sans-serif;color:var(--ink);background:linear-gradient(180deg,#f8fcff,#eef5f8)}
a{text-decoration:none;color:inherit}img{max-width:100%}button{font:inherit}
.site-header{position:sticky;top:0;z-index:100;min-height:74px;padding:10px max(18px,calc((100vw - 1320px)/2));display:flex;align-items:center;gap:18px;background:rgba(21,58,84,.97);color:white;box-shadow:0 8px 28px rgba(0,0,0,.18)}
.brand{display:flex;gap:10px;align-items:center;white-space:nowrap}.brand-icon{font-size:2rem}.brand b{display:block;color:#ffe19b;font-size:1.15rem}.brand small{display:block;font-weight:800}
.nav-links{display:flex;gap:3px;margin-left:auto}.nav-links a{padding:10px 11px;border-radius:999px;font-weight:900}.nav-links a:hover,.nav-links a.active{background:white;color:var(--navy)}
.menu-button{display:none;margin-left:auto;border:0;border-radius:14px;background:white;color:var(--navy);padding:11px 15px;font-weight:900}
.hero{background:#d8ecfa}.hero picture{display:block}.hero img{display:block;width:100%;height:auto;object-fit:contain}.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;padding:18px;background:#f7fbff}
.btn{min-height:52px;padding:0 24px;display:inline-flex;align-items:center;justify-content:center;border:2px solid var(--navy);border-radius:16px;background:white;color:var(--navy);font-weight:900}.btn.primary{background:var(--navy);color:white}
.container{max-width:1240px;margin:auto;padding:42px 20px}.page-head{margin-bottom:26px}.page-head h1{margin:0 0 10px;color:var(--navy);font-size:clamp(2.4rem,5vw,4.5rem);line-height:1.12}.page-head p{color:var(--muted);font-size:1.08rem;line-height:1.85}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:22px}.card{background:white;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow);line-height:1.85}.card h2,.card h3{margin-top:0;color:var(--navy)}
.feature{transition:.2s}.feature:hover{transform:translateY(-4px)}.feature-icon{font-size:2.05rem}.tag{display:inline-block;padding:6px 12px;border-radius:999px;background:#dceef9;color:var(--navy);font-weight:900}
.photo{display:block;width:100%;border-radius:22px;background:white;box-shadow:var(--shadow);cursor:zoom-in}.section-title{margin:38px 0 18px;color:var(--navy);font-size:2rem}
.timeline{display:grid;gap:18px}.event{display:grid;grid-template-columns:minmax(300px,430px) 1fr;gap:22px;align-items:center;background:white;border-radius:25px;padding:20px;box-shadow:var(--shadow)}.event:nth-child(even){grid-template-columns:1fr minmax(300px,430px)}.event:nth-child(even) img{order:2}.event h3{font-size:1.42rem;color:var(--navy);margin-top:0}
.poem-card{display:grid;grid-template-columns:360px 1fr;gap:20px;align-items:center;background:white;border-radius:24px;padding:20px;box-shadow:var(--shadow)}.poem-card h3{color:var(--navy);margin-top:0}
.accordion{display:grid;gap:15px}.accordion details{background:white;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}.accordion summary{cursor:pointer;padding:20px 22px;font-weight:900;color:var(--navy);list-style:none}.accordion details>div{padding:0 22px 22px;line-height:1.85}
.note{padding:22px;border-radius:22px;background:var(--navy);color:white;line-height:1.85}.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.gallery figure{margin:0;background:white;border-radius:20px;padding:12px;box-shadow:var(--shadow)}.gallery figcaption{padding:9px 4px 3px;color:var(--navy);font-weight:900;line-height:1.5}
.quiz-wrap{max-width:960px;margin:auto}.progress-card{position:sticky;top:86px;z-index:20}.progress{height:14px;background:#dbe7ee;border-radius:999px;overflow:hidden;margin-top:10px}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--navy),var(--blue))}
.qcard{background:white;border-radius:23px;padding:22px;margin:18px 0;box-shadow:var(--shadow)}.level-heading{margin:30px 0 12px;padding:16px 20px;border-radius:18px;background:var(--navy);color:white;font-size:1.25rem;font-weight:900}.option{display:grid;grid-template-columns:24px 32px 1fr;gap:8px;align-items:start;margin:9px 0;padding:13px;border:2px solid #d9e4ea;border-radius:15px;cursor:pointer}.option:hover{border-color:var(--navy);background:#f4faff}.option input{margin-top:5px}
.result{display:none;background:white;border-radius:24px;padding:24px;margin-top:22px;box-shadow:var(--shadow)}.result.show{display:block}.review{padding:14px;margin:10px 0;border-radius:14px;line-height:1.7}.correct{background:#e7f3e8}.wrong{background:#fae8e4}
.lightbox{display:none;position:fixed;inset:0;z-index:500;align-items:center;justify-content:center;padding:26px;background:rgba(10,28,40,.94)}.lightbox.show{display:flex}.lightbox img{max-width:94vw;max-height:88vh;object-fit:contain;border-radius:14px}.lightbox-close{position:absolute;top:18px;right:20px;width:48px;height:48px;border:0;border-radius:50%;background:white;font-size:1.8rem}
.footer{margin-top:48px;background:var(--navy);color:white;text-align:center;padding:28px 20px;display:grid;gap:6px}
@media(max-width:1040px){.menu-button{display:block}.nav-links{display:none}.nav-links.open{position:absolute;left:12px;right:12px;top:72px;display:flex;flex-direction:column;align-items:stretch;background:white;color:var(--navy);padding:12px;border-radius:18px;box-shadow:var(--shadow)}.grid{grid-template-columns:repeat(2,1fr)}.grid-2,.event,.event:nth-child(even),.poem-card{grid-template-columns:1fr}.event:nth-child(even) img{order:0}.gallery{grid-template-columns:repeat(2,1fr)}}
@media(max-width:680px){.site-header{min-height:64px;padding:8px 14px}.brand b{font-size:1rem}.brand small{font-size:.82rem}.container{padding:28px 14px}.grid,.gallery{grid-template-columns:1fr}.hero img{width:100%;height:auto;object-fit:contain;object-position:center top}.hero-actions{display:grid;grid-template-columns:1fr;padding:14px}.btn{width:100%}.page-head h1{font-size:2.45rem}.progress-card{top:76px}}