:root{--ink:#142c4a;--muted:#607185;--teal:#147f83;--teal-dark:#0e696d;--coral:#e8766b;--line:#dce5ea;--wash:#f3f8f8;--paper:#fff;--soft:#f7f9fb}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font-family:'IBM Plex Sans Thai',Tahoma,sans-serif;font-size:16px;line-height:1.6}button,a{font:inherit}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}button:focus-visible,a:focus-visible{outline:3px solid var(--coral);outline-offset:4px}.wrap{max-width:1200px;padding:0 28px;margin:0 auto}.site-header{height:91px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;line-height:1.2}.brand-mark{display:grid;place-items:center;width:46px;height:46px;background:#e5f4f3;border-radius:14px;color:var(--teal);font-weight:700;font-size:28px}.brand strong{display:block;font-size:21px;letter-spacing:-.03em}.brand small{display:block;margin-top:4px;color:var(--muted);font-size:12px}.site-header nav{display:flex;align-items:center;gap:32px}.site-header nav a{font-size:15px;font-weight:600;color:var(--muted);padding:9px 0}.site-header nav a:hover,.site-header nav .nav-current{color:var(--teal)}.site-header nav .nav-current{border-bottom:2px solid var(--teal)}.home-main{padding-top:64px;padding-bottom:92px}.home-intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:48px}.home-intro h1{font-size:clamp(36px,4.5vw,62px);line-height:1.2;letter-spacing:-.05em;margin:0 0 15px;font-weight:700}.home-intro p{margin:0;color:var(--muted);max-width:640px;font-size:18px}.intro-scribble{font-weight:700;font-size:28px;color:#b1c9c9;transform:rotate(-7deg);white-space:nowrap}.subjects{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:24px}.subject-feature{min-height:520px;background:#eefafa;border:1px solid #a8d7d8;border-radius:24px;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between}.feature-copy{padding:36px 38px 0;position:relative;z-index:1}.subject-symbol{width:48px;height:48px;border-radius:15px;display:inline-grid;place-items:center;flex:none;font-size:26px;font-weight:700}.math-symbol{background:#d1eeee;color:var(--teal)}.feature-copy h2{font-size:37px;line-height:1.2;letter-spacing:-.04em;margin:19px 0 12px}.feature-copy p{color:#4d6771;font-size:17px;max-width:440px;margin:0 0 22px}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;border-radius:12px;border:1px solid transparent;padding:13px 21px;font-weight:700;transition:transform .18s,background .18s,box-shadow .18s}.button:hover:not(:disabled){transform:translateY(-2px)}.button-primary{background:var(--teal);color:white;box-shadow:0 7px 17px #147f8326}.button-primary:hover:not(:disabled){background:var(--teal-dark)}.button-light{background:#fff;border-color:var(--line);color:var(--ink)}.button-light:hover:not(:disabled){background:#f4f9f9}.feature-image{display:block;width:100%;height:226px;object-fit:cover;object-position:center 59%;mix-blend-mode:multiply}.subject-list{display:grid;grid-template-columns:1fr 1fr;gap:18px}.subject-tile{border:1px solid var(--line);border-radius:20px;padding:22px 22px 19px;display:flex;flex-direction:column;align-items:flex-start;min-height:251px;background:#fff}.subject-tile h2{font-size:21px;line-height:1.32;margin:15px 0 5px;letter-spacing:-.025em}.subject-tile p{font-size:14px;color:var(--muted);margin:0}.coming-soon{margin-top:auto;color:#7d8b98;background:#f0f3f5;border-radius:99px;padding:5px 13px;font-size:12px;font-weight:600}.religion-symbol{background:#fff0d7;color:#c18b35}.social-symbol{background:#e4f0fa;color:#517d9e}.work-symbol{background:#eaf1de;color:#758b4b}.health-symbol{background:#fde9ea;color:#cf6874}.site-footer{border-top:1px solid var(--line);padding-top:23px;padding-bottom:26px;color:var(--muted);font-size:13px;display:flex;justify-content:space-between}.practice-main{padding-top:35px;padding-bottom:90px}.page-heading{margin-bottom:30px}.back-link{font-size:14px;color:var(--teal);font-weight:600}.back-link span{font-size:20px;vertical-align:-1px;margin-right:4px}.page-heading h1{margin:9px 0 0;font-size:42px;line-height:1.25;letter-spacing:-.04em}.page-heading p{margin:2px 0;color:var(--muted)}.practice-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:26px;align-items:start}.topic-panel{border:1px solid var(--line);border-radius:20px;padding:22px;background:#fbfcfd}.topic-panel h2{font-size:18px;margin:0 0 18px}.topic-panel ol{list-style:none;padding:0;margin:0;display:grid;gap:8px}.topic-panel li{display:flex;align-items:center;gap:11px;padding:12px 11px;border-radius:12px;font-size:14px;line-height:1.35;color:var(--muted)}.topic-panel li .topic-number{display:grid;place-items:center;flex:none;width:30px;height:30px;background:#eaf0f3;color:var(--ink);border-radius:9px;font-weight:700}.topic-panel li.active{background:#e4f4f3;color:var(--teal-dark);font-weight:700}.topic-panel li.active .topic-number{background:var(--teal);color:white}.topic-note{border-top:1px solid var(--line);padding-top:18px;margin:18px 3px 2px;color:var(--muted);font-size:13px}.question-panel{border:1px solid var(--line);border-radius:20px;padding:36px 42px 31px;min-height:590px}.progress-line{display:flex;justify-content:space-between;gap:15px;font-size:14px;color:var(--muted);font-weight:600}.progress-line span:first-child{color:var(--ink)}.progress-track{height:8px;background:#e7edef;border-radius:99px;overflow:hidden;margin-top:13px}.progress-track span{display:block;width:0;height:100%;background:var(--teal);border-radius:inherit;transition:width .3s}.question-topic{color:var(--teal);font-weight:700;margin:33px 0 6px;font-size:15px}.question-text{font-size:clamp(23px,2.5vw,32px);line-height:1.42;letter-spacing:-.025em;margin:0 0 25px;max-width:750px}.answers{display:grid;gap:11px}.answer-option{display:flex;align-items:center;text-align:left;gap:16px;min-height:62px;padding:13px 17px;border:1.5px solid #c9d9e4;border-radius:12px;background:white;color:var(--ink);font-size:18px;font-weight:500;width:100%}.answer-option:hover:not(:disabled){background:#f4faf9;border-color:var(--teal)}.answer-marker{width:25px;height:25px;border:1.5px solid #93a9b7;border-radius:50%;flex:none;display:grid;place-items:center;font-size:14px;font-weight:700}.answer-option.selected{border-color:var(--teal);background:#edf8f7}.answer-option.selected .answer-marker{background:var(--teal);border-color:var(--teal);color:white}.answer-option.correct{border-color:#3eaa80;background:#ecf9f1}.answer-option.correct .answer-marker{background:#3eaa80;border-color:#3eaa80;color:#fff}.answer-option.incorrect{border-color:#d5847b;background:#fff2f0}.answer-option.incorrect .answer-marker{background:#d5847b;border-color:#d5847b;color:#fff}.feedback{border-left:4px solid #3eaa80;background:#f1faf5;border-radius:0 10px 10px 0;padding:12px 17px;margin-top:17px;font-size:15px}.feedback.wrong{border-color:#dc8c77;background:#fff6f2}.feedback strong{display:block;margin-bottom:2px}.question-actions{display:flex;justify-content:space-between;gap:12px;margin-top:27px}.question-visual{margin:0 0 23px}.blocks{display:flex;align-items:flex-end;gap:10px;padding:15px 0}.hundred-block{width:92px;height:92px;background-color:#e9a19a;background-image:linear-gradient(#ca756e 1px,transparent 1px),linear-gradient(90deg,#ca756e 1px,transparent 1px);background-size:10% 10%;border:2px solid #ca756e;border-radius:4px}.ten-block{width:18px;height:92px;background:repeating-linear-gradient(to bottom,#86c8c9 0,#86c8c9 8px,#3b9699 8px,#3b9699 9px);border:1px solid #3b9699;border-radius:3px}.unit-block{width:16px;height:16px;background:#e8c77b;border:1px solid #bb9447;border-radius:2px}.units{display:flex;gap:4px;align-items:flex-end}.visual-caption{color:var(--muted);font-size:13px}.results-view{text-align:center;padding:64px 20px}.results-icon{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;background:#dff4ea;color:#23875e;font-size:35px;margin:0 auto 20px}.results-view h2{font-size:36px;margin:0 0 8px}.results-view p{color:var(--muted);margin:5px 0}.results-view #results-score{font-size:21px;color:var(--ink);font-weight:700}.result-actions{display:flex;justify-content:center;gap:12px;margin-top:24px;flex-wrap:wrap}[hidden]{display:none!important}@media(max-width:900px){.subjects{grid-template-columns:1fr}.subject-feature{min-height:460px}.feature-image{height:220px}.practice-layout{grid-template-columns:1fr}.topic-panel{padding:17px}.topic-panel ol{grid-template-columns:repeat(4,1fr)}.topic-panel li{flex-direction:column;text-align:center}.topic-note{display:none}}@media(max-width:620px){.wrap{padding-left:18px;padding-right:18px}.site-header{height:75px}.brand-mark{width:39px;height:39px;font-size:23px;border-radius:11px}.brand strong{font-size:17px}.brand small{font-size:10px}.site-header nav{gap:14px}.site-header nav a{font-size:12px}.home-main{padding-top:43px;padding-bottom:60px}.home-intro{margin-bottom:29px}.home-intro h1{font-size:37px}.home-intro p{font-size:15px}.intro-scribble{display:none}.subject-feature{min-height:auto}.feature-copy{padding:27px 25px 0}.feature-copy h2{font-size:30px}.feature-copy p{font-size:15px}.feature-image{height:195px}.subject-list{gap:12px}.subject-tile{padding:17px;min-height:207px}.subject-symbol{width:40px;height:40px;font-size:22px}.subject-tile h2{font-size:17px}.subject-tile p{font-size:12px}.coming-soon{font-size:11px}.practice-main{padding-top:23px}.page-heading h1{font-size:33px}.topic-panel ol{grid-template-columns:repeat(2,1fr)}.topic-panel li{flex-direction:row;text-align:left;font-size:12px}.question-panel{padding:25px 19px;min-height:0}.question-topic{margin-top:29px}.question-text{font-size:24px}.answer-option{font-size:16px;min-height:58px}.question-actions .button{font-size:13px;padding:10px 11px}.site-footer{font-size:11px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.question-panel,.topic-panel{min-width:0}
.subject-link{transition:border-color .18s,box-shadow .18s,transform .18s}
.subject-link:hover{border-color:#a8d7d8;box-shadow:0 10px 24px #142c4a12;transform:translateY(-2px)}
.subject-link:focus-visible{outline-offset:3px}
.subject-open{margin-top:auto;color:var(--teal);font-size:14px;font-weight:700}
.science-symbol{background:#e4f0fa;color:#517d9e}
.login-main{min-height:calc(100vh - 175px);display:grid;place-items:center;padding-top:45px;padding-bottom:65px}
.login-card{width:min(100%,450px);border:1px solid var(--line);border-radius:22px;padding:36px;background:var(--paper);box-shadow:0 12px 34px #142c4a0b}
.login-card h1{font-size:32px;line-height:1.25;margin:18px 0 6px}
.login-card p{color:var(--muted);margin:0 0 23px}
.login-card form{display:grid;gap:12px;margin-bottom:22px}
.login-card label{font-weight:700}
.login-card input{width:100%;border:1px solid #c9d9e4;border-radius:12px;padding:12px 15px;font:inherit;font-size:20px;letter-spacing:.12em}
.login-card input:focus-visible{outline:3px solid var(--coral);outline-offset:2px}
.login-card .button{margin-top:5px}
.login-card .login-error{margin:0;color:#b34d43;font-size:14px}
.extra-callout{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:19px 23px;margin:-5px 0 25px;border:1px solid #a8d7d8;border-radius:16px;background:#f1fbfb}
.reset-link{border:0;background:transparent;color:var(--teal);padding:0;font-size:13px;font-weight:700;white-space:nowrap}
.reset-link:hover{text-decoration:underline}
.progress-line:has(.reset-link){align-items:center;flex-wrap:wrap}
.extra-callout strong{font-size:18px}
.extra-callout p{margin:3px 0 0;color:var(--muted);font-size:14px}
.extra-callout .button{flex:none}
.extra-main{max-width:900px}
.extra-overview{border:1px solid var(--line);border-radius:18px;background:#fbfcfd;padding:22px 29px;margin-bottom:24px}
.extra-overview h2{margin:0 0 9px;font-size:21px}
.extra-overview ul{margin:0;padding-left:22px;color:var(--muted)}
.extra-overview li+li{margin-top:5px}
.extra-quiz{min-height:0;margin-bottom:44px}
.written-section{margin-bottom:30px}
.written-section>h2{font-size:28px;margin:0 0 2px}
.written-section>p{color:var(--muted);margin:0 0 18px}
.written-card{border:1px solid var(--line);border-radius:18px;padding:25px;margin-bottom:16px}
.written-card h3{margin:0 0 8px;font-size:20px}
.written-card p{margin:0 0 18px}
.written-card label{display:block;font-weight:700;margin-bottom:7px}
.written-card textarea{width:100%;resize:vertical;border:1px solid #c9d9e4;border-radius:12px;padding:12px;font:inherit;margin-bottom:14px}
.written-card textarea:focus-visible{outline:3px solid var(--coral);outline-offset:2px}
.written-example{margin-top:17px;padding:17px;border-left:4px solid var(--teal);background:#f1faf9;border-radius:0 10px 10px 0}
.written-example p{margin:5px 0 0}
@media(max-width:620px){
  .extra-callout{align-items:flex-start;flex-direction:column;padding:17px}
  .extra-callout .button{width:100%}
  .extra-overview{padding:19px}
  .written-card{padding:19px}
  .blocks{gap:5px}
  .hundred-block{width:58px;height:58px}
  .ten-block{width:11px;height:58px;background:repeating-linear-gradient(to bottom,#86c8c9 0,#86c8c9 5px,#3b9699 5px,#3b9699 6px)}
  .unit-block{width:10px;height:10px}
  .units{gap:2px}
}

/* Catalogue: give each of the six subjects an equal, readable card. */
.subjects{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.subject-list{display:contents}
.subject-feature{min-height:245px;justify-content:initial}
.subject-feature .feature-copy{padding:22px;display:flex;flex-direction:column;align-items:flex-start;height:100%}
.subject-feature .feature-copy h2{font-size:23px;margin:15px 0 5px}
.subject-feature .feature-copy p{font-size:14px;line-height:1.55;margin:0 0 15px}
.subject-feature .button{font-size:14px;padding:8px 0;background:transparent;color:var(--teal);box-shadow:none;margin-top:auto}
.subject-feature .button:hover{background:transparent;text-decoration:underline;transform:none}
.subject-feature .feature-image{display:none}
.subject-tile{min-height:245px}
.social-overview{border:1px solid #d4e3dd;background:#f5faf7;border-radius:16px;padding:16px 21px;margin:-5px 0 25px}
.social-overview strong{color:#426a50}
.social-overview p{margin:2px 0 0;color:var(--muted);font-size:14px}
@media(max-width:900px){.subjects{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.subjects{grid-template-columns:1fr;gap:12px}.subject-feature,.subject-tile{min-height:0}.subject-feature .feature-copy,.subject-tile{padding:19px}.subject-feature .feature-copy h2{font-size:21px}.subject-feature .feature-copy p,.subject-tile p{font-size:14px}.subject-feature .button{margin-top:10px}.subject-open{margin-top:12px}}
.subject-computing{background:#f5f9ff;border-color:#c9dcf1}
.computing-symbol{background:#dceaff;color:#4273ad}