:root{--navy:#071927;--ink:#102b39;--cream:#f4efe4;--gold:#d7b46a;--teal:#54c4b5;--coral:#e8836f}*{box-sizing:border-box}body{margin:0;background:var(--navy);color:#f7f3eb;font-family:Arial,"Noto Sans Thai",sans-serif;line-height:1.55}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit}header{height:68px;display:flex;align-items:center;justify-content:space-between;padding:0 max(18px,calc((100% - 1180px)/2));border-bottom:1px solid #294451}.brand{display:flex;align-items:center;gap:8px;text-decoration:none;font-weight:900;letter-spacing:.12em}.brand img{width:32px}.brand i{color:var(--gold)}.notice{padding:10px 20px;text-align:center;background:#e8d6aa;color:#162a36;font-size:13px}.intro{width:min(1180px,calc(100% - 36px));margin:50px auto 24px}.intro p{color:var(--gold);font-size:12px;letter-spacing:.16em;font-weight:900}.intro h1{font:clamp(42px,6vw,70px)/1.05 Georgia,"Noto Serif Thai",serif;margin:8px 0}.tabs{display:flex;gap:8px;flex-wrap:wrap}.tabs button{border:1px solid #49636f;background:transparent;color:#fff;padding:10px 13px}.tabs button.active{background:var(--gold);color:var(--navy);border-color:var(--gold)}.stage{width:min(1180px,calc(100% - 36px));margin:25px auto 80px;display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px}.sidebar{background:#102c3a;border:1px solid #2e4c59;padding:24px}.sidebar>span{font-size:12px;color:var(--gold);letter-spacing:.11em}.sidebar h2{font:32px/1.1 Georgia,"Noto Serif Thai",serif}.sidebar dl{display:grid;grid-template-columns:1fr 1fr;gap:8px;border-top:1px solid #36515d;padding-top:15px}.sidebar dd{text-align:right;margin:0;color:#d6b46b}.app{background:var(--cream);color:#132b37;min-height:520px;padding:clamp(20px,4vw,44px)}.tools{display:flex;gap:8px;flex-wrap:wrap}.tools input,.tools select{padding:11px;border:1px solid #c5baa5;background:#fff}.tools input{flex:1}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}.card{background:#fff;border:1px solid #d5cbb9;padding:20px}.card small{color:#a06f25}.card strong{display:block;color:#a06f25;font-size:21px}.card button,.primary,.answers button{border:0;background:var(--gold);color:var(--navy);padding:10px 13px;font-weight:800}.shortlist{margin-top:20px;padding:18px;background:#0e2a38;color:#fff}.shortlist ul{padding:0;list-style:none}.shortlist li{display:flex;justify-content:space-between;border-bottom:1px solid #3c5560;padding:8px 0}.shortlist button{background:none;color:#f19a87;border:0}.progress{height:7px;background:#cfc5b2}.progress i{display:block;height:100%;background:var(--gold)}.lesson-nav{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.lesson-nav button{background:#fff;border:1px solid #c5baa5;padding:9px}.lesson-nav button.done{border-color:#3f9b8e;color:#26776b}.mission{padding:35px 0}.mission h2{font:clamp(33px,5vw,55px)/1.05 Georgia,"Noto Serif Thai",serif}.answers{display:grid;gap:10px}.answers button{text-align:left;background:#fff;border:1px solid #c5baa5}.hidden{display:none}.toast{color:#26776b;font-weight:800}@media(max-width:760px){.stage{grid-template-columns:1fr}.grid{grid-template-columns:1fr}}