:root{--ink:#2B2D42;--muted:#5E6384;--pink:#FF5FA2;--blue:#3DB4FF;--green:#2ED47A;--yellow:#FFC93C;--orange:#FF8A3D;--purple:#9B6BFF;--line:#E6ECF5;--soft:#F3F8FF}
*{box-sizing:border-box}
html{scroll-padding-top:16px}
body{margin:0;font-family:'Kanit',system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.6;padding-bottom:env(safe-area-inset-bottom,0px)}
h1,h2,h3,.brand{font-family:'Mitr','Kanit',sans-serif;line-height:1.3}
a{color:#1E7CC4}
img{max-width:100%;display:block}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.nav{display:flex;justify-content:space-between;align-items:center;padding:14px 0;gap:12px}
.brand{font-weight:700;font-size:19px;color:var(--purple);text-decoration:none}
.nav-links{display:flex;gap:16px;align-items:center;font-weight:600;font-size:15px}
.nav-links a{color:var(--ink);text-decoration:none}
.btn{display:inline-block;border-radius:18px;padding:13px 22px;font-weight:800;font-size:17px;text-decoration:none;color:#fff;background:var(--green);box-shadow:0 5px 0 #1FA35C;transition:transform .1s}
.btn:active{transform:translateY(3px);box-shadow:none}
.btn.small{padding:8px 14px;font-size:14px;border-radius:14px;box-shadow:0 4px 0 #1FA35C}
.btn.ghost{background:#fff;color:var(--ink);box-shadow:0 5px 0 #C9D6E8}
.btn:focus-visible,a:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.hero{background:linear-gradient(180deg,#7FCBFF 0%,#BFE7FF 55%,#E9FFE0 100%);padding-bottom:40px;padding-top:env(safe-area-inset-top,0px)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center;padding-top:20px}
.hero h1{font-size:clamp(36px,6vw,62px);margin:8px 0 12px}
.hero p.lead{font-size:clamp(17px,2.2vw,20px);color:#3B4060;max-width:32em;margin:0 0 22px}
.hero .emoji{font-size:44px;letter-spacing:4px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.trust{margin-top:18px;font-size:14px;color:#3B4060;font-weight:600}
.phone{justify-self:center;width:min(300px,80vw);border-radius:40px;border:10px solid #fff;box-shadow:0 24px 60px rgba(30,80,140,.3);overflow:hidden;background:#fff}
section{padding:56px 0}
section h2{font-size:clamp(26px,4vw,38px);margin:0 0 8px;text-align:center}
section .sub{text-align:center;color:var(--muted);margin:0 auto 30px;max-width:40em}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feat{background:var(--soft);border:3px solid var(--line);border-radius:22px;padding:18px}
.feat .fi{font-size:40px}
.feat h3{margin:6px 0 4px;font-size:19px}
.feat p{margin:0;color:var(--muted);font-size:15px}
.shots{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:start}
.shots figure{margin:0;text-align:center}
.shots img{border-radius:28px;border:8px solid #fff;box-shadow:0 14px 34px rgba(30,80,140,.18);margin:0 auto;width:100%;max-width:260px}
.shots figcaption{margin-top:10px;font-weight:700}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;counter-reset:s}
.step{background:#FFF7E0;border:3px solid var(--yellow);border-radius:22px;padding:18px;position:relative}
.step b{display:block;font-size:18px;margin-bottom:4px}
.band{background:linear-gradient(180deg,#F3F8FF,#fff)}
.std{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.std div{background:#fff;border:3px solid var(--line);border-radius:18px;padding:14px;font-size:15px}
.std b{display:block;font-size:17px}
.grades{display:grid;grid-template-columns:repeat(7,1fr);gap:10px}
.grade-card{background:#fff;border:3px solid var(--line);border-radius:18px;padding:12px 8px;text-align:center}
.grade-card b{display:block;font-size:20px;font-family:'Mitr','Kanit',sans-serif}
.grade-card a{display:block;font-size:13px;text-decoration:none;padding:2px 0}
.parent{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}
.parent ul{padding-left:20px;margin:0}
.parent li{margin:6px 0}
.faq details{background:var(--soft);border:3px solid var(--line);border-radius:18px;padding:12px 16px;margin-bottom:10px}
.faq summary{font-weight:800;cursor:pointer;font-size:17px}
.final{background:linear-gradient(180deg,#9B6BFF,#6E45D1);color:#fff;text-align:center;border-radius:30px;padding:40px 20px;margin:0 20px}
.final h2{color:#fff}
footer{padding:30px 0 40px;color:var(--muted);font-size:14px;text-align:center}
footer a{margin:0 8px}
/* practice */
.crumbs{font-size:14px;color:var(--muted);margin:10px 0}
.crumbs a{color:var(--muted)}
.page-h{background:linear-gradient(180deg,#BFE7FF,#fff);padding:10px 0 20px}
.page-h h1{font-size:clamp(28px,4.5vw,42px);margin:6px 0}
.tag{display:inline-block;background:#fff;border:2px solid var(--line);border-radius:12px;padding:2px 10px;font-size:13px;font-weight:600;color:var(--muted);margin:2px 4px 2px 0}
.q{border:3px solid var(--line);border-radius:20px;padding:16px 18px;margin:0 0 14px;background:#fff;break-inside:avoid}
.q h2{font-size:19px;margin:0 0 10px;text-align:left}
.q ol{margin:0 0 10px;padding-left:0;list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.q li{background:var(--soft);border-radius:12px;padding:8px 12px;font-weight:600}
.q details summary{cursor:pointer;font-weight:800;color:var(--purple)}
.q .ans{margin-top:6px;background:#E6FBEF;border-radius:12px;padding:10px 12px}
.q small{color:var(--muted)}
.cta-box{background:#FFF7E0;border:3px solid var(--yellow);border-radius:22px;padding:18px;text-align:center;margin:24px 0}
.rel{display:flex;flex-wrap:wrap;gap:8px}
.rel a{background:var(--soft);border:2px solid var(--line);border-radius:12px;padding:6px 12px;text-decoration:none;color:var(--ink);font-size:14px;font-weight:600}
.hub{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.hub-card{border:3px solid var(--line);border-radius:22px;padding:16px}
.hub-card h2{text-align:left;font-size:22px;margin:0 0 8px}
.prose{max-width:760px;margin:0 auto;padding:10px 20px 40px}
.prose h2{text-align:left;font-size:22px;margin:26px 0 6px}
.note{background:#FFF1F1;border:3px solid #FFC9C9;border-radius:16px;padding:12px 14px;font-size:14px}
.try{background:#FFF7E0;border:3px solid var(--yellow);border-radius:26px;padding:22px;max-width:640px;margin:0 auto;text-align:center}
.try .tq{font-family:'Mitr','Kanit',sans-serif;font-size:24px;margin:8px 0 14px}
.try .opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.try .opts button{border:none;border-radius:18px;padding:14px;font-size:18px;font-weight:800;color:#fff;cursor:pointer;font-family:inherit;box-shadow:0 5px 0 rgba(0,0,0,.18)}
.try .opts button:nth-child(1){background:var(--blue)}.try .opts button:nth-child(2){background:var(--pink)}.try .opts button:nth-child(3){background:var(--green)}.try .opts button:nth-child(4){background:var(--orange)}
.try .opts button:disabled{opacity:.45}
.try .msg{min-height:28px;font-weight:800;margin-top:12px}
[hidden]{display:none!important}
.rv-box{display:grid;grid-template-columns:180px 1fr 170px;gap:22px;align-items:center;background:#fff;border:3px solid var(--line);border-radius:24px;padding:20px 22px;max-width:860px;margin:0 auto}
.rv-sum{text-align:center}
.rv-avg{font-size:56px;font-weight:700;font-family:'Mitr','Kanit',sans-serif;line-height:1;color:#E07A00}
.rv-stars-big{font-size:26px;color:#FFB400;letter-spacing:2px}
.rv-total{font-size:14px;color:var(--muted)}
.rv-bars{display:grid;gap:6px}
.rv-bar{display:grid;grid-template-columns:48px 1fr 36px;gap:8px;align-items:center;font-size:14px;font-weight:600}
.rv-bar .tr{height:12px;background:#EEF2F8;border-radius:8px;overflow:hidden}
.rv-bar .fl{height:100%;background:#FFB400;border-radius:8px;transition:width .6s}
.rv-bar span:last-child{color:var(--muted);text-align:right}
.rv-cta{text-align:center}
.rv-filters{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:20px 0 12px}
.rv-filters button{border:2px solid var(--line);background:#fff;border-radius:12px;padding:6px 12px;font:inherit;font-size:14px;font-weight:600;cursor:pointer;color:var(--ink)}
.rv-filters button.on{border-color:#E07A00;color:#E07A00;background:#FFF4E5}
.rv-list{max-width:860px;margin:0 auto;background:#fff;border:3px solid var(--line);border-radius:24px;padding:4px 20px}
.rv-item{display:flex;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.rv-item:last-child{border-bottom:none}
.rv-av{width:40px;height:40px;border-radius:50%;background:#FFE3F0;color:#B0306A;display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0}
.rv-item .nm{font-weight:700;font-size:15px}
.rv-item .st{color:#FFB400;font-size:15px;letter-spacing:1px}
.rv-item p{margin:4px 0;font-size:15px;white-space:pre-wrap;word-break:break-word}
.rv-item small{color:var(--muted)}
.rv-empty{text-align:center;color:var(--muted);padding:26px 0}
.rv-form{max-width:560px;margin:18px auto 0;background:#fff;border:3px solid #FFB400;border-radius:22px;padding:16px;text-align:center}
.rv-form input,.rv-form textarea{width:100%;border:2px solid var(--line);border-radius:12px;padding:10px;font:inherit;margin:6px 0}
.stars button{background:none;border:none;font-size:32px;cursor:pointer;filter:grayscale(1);opacity:.45;padding:0 2px}
.stars button.on{filter:none;opacity:1}
.share{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.btn.line{background:#06C755;box-shadow:0 5px 0 #04963F}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
@media (max-width:860px){.rv-box{grid-template-columns:1fr;text-align:center}.hero-grid,.parent{grid-template-columns:1fr}.features,.steps,.std,.shots{grid-template-columns:1fr 1fr}.grades{grid-template-columns:repeat(4,1fr)}.hub{grid-template-columns:1fr}.nav-links .hide-m{display:none}}
@media (max-width:520px){.try .opts{grid-template-columns:1fr}.features,.steps,.std,.shots{grid-template-columns:1fr}.grades{grid-template-columns:repeat(2,1fr)}.q ol{grid-template-columns:1fr}}
@media print{.nav,.cta-box,footer,.rel,.no-print,details summary{display:none!important}.q details{display:block}.q details[open] .ans,.q .ans{display:none}.q{border:1px solid #999}body{font-size:14px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}