:root{background:#fff;color:#203951;--blue:#233f68;--slate:#435977}
.shell{display:flex;flex-direction:column;min-height:100vh;background:#f7f9fb}
.site-header{background:#fff;border-bottom:1px solid #eef1f5}
.header-inner{max-width:1190px;min-height:108px;margin:auto;padding:18px 28px;display:flex;align-items:center;gap:38px}
.brand-link{display:inline-flex;align-items:center;gap:9px;padding:0;border:0;background:transparent;color:var(--blue);font-weight:850;font-size:1.34rem;letter-spacing:-.045em;white-space:nowrap}
.brand-symbol{width:29px;height:29px;border-radius:8px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:1.35rem;line-height:1;font-weight:700}
.top-nav{display:flex;align-items:center;justify-content:center;flex:1;gap:25px}
.top-nav button{padding:10px 1px;background:transparent;border:0;color:#2e4766;font-size:.78rem;letter-spacing:.035em;text-transform:uppercase;font-weight:800;white-space:nowrap}
.top-nav button.active,.top-nav button:hover{color:#087f83}
.top-nav button.active{box-shadow:inset 0 -2px #087f83}
.header-search{display:flex;align-items:center;width:176px;height:34px;border-radius:30px;background:var(--blue);color:#75d7ee;padding:0 10px 0 14px;flex:none}
.header-search input{min-width:0;width:100%;border:0;outline:0;background:transparent;color:white;font-size:.74rem}
.header-search input::placeholder{color:#c6d6e7}
.header-search span[aria-hidden]{font-size:1.4rem;line-height:1}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.main{flex:1;width:100%;padding:38px 28px 68px}
.main .container{max-width:1120px}
.home-main{background:#fff;padding-top:54px;padding-bottom:100px}
.home-intro{text-align:center;margin:0 auto 57px}
.home-intro .eyebrow,.period-heading .eyebrow{color:#54819b}
.home-intro h1{color:var(--blue);font-size:clamp(2rem,4vw,3.25rem);letter-spacing:-.055em;margin:10px 0 9px}
.home-intro p,.period-heading p{color:#66798d;margin:0;line-height:1.55}
.period-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px 42px;max-width:990px;margin:auto}
.period-card{position:relative;min-height:162px;padding:24px 27px;text-align:left;border:0;border-radius:10px;background:var(--slate);color:#fff;box-shadow:0 9px 21px rgba(38,60,86,.08);display:flex;flex-direction:column;align-items:flex-start;justify-content:center;transition:transform .18s,box-shadow .18s,background .18s}
.period-card:hover{background:#314c70;transform:translateY(-3px);box-shadow:0 16px 30px rgba(38,60,86,.17)}
.period-kind{font-size:.65rem;letter-spacing:.15em;font-weight:800;color:#d4deea;margin-bottom:13px}
.period-card strong{text-transform:uppercase;font-size:1.17rem;letter-spacing:.015em}
.period-count{font-size:.8rem;color:#d7e1ec;margin-top:11px}
.period-arrow{position:absolute;right:23px;bottom:24px;font-size:1.3rem;color:#d7e1ec}
.site-footer{background:var(--blue);color:#fff;padding:28px}
.footer-inner{max-width:1120px;margin:auto;display:flex;align-items:center;gap:17px}
.footer-inner b{font:700 1.12rem Georgia,serif}
.footer-inner span{font-size:.85rem;color:#d0ddeb}
.footer-inner small{margin-left:auto;color:#b5c7db;font-size:.75rem}
.back-link{padding:0;border:0;background:transparent;color:#197b82;font-size:.84rem;font-weight:800;margin-bottom:24px}
.period-heading{text-align:center;padding:15px 0 39px}
.period-heading h1{color:var(--blue);font-size:clamp(2rem,4vw,3.05rem);margin:7px 0 10px;letter-spacing:-.055em}
.mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;max-width:850px;margin:auto}
.mode-grid.single{grid-template-columns:minmax(0,1fr);max-width:440px}
.mode-card{display:flex;align-items:center;gap:17px;text-align:left;min-height:155px;padding:24px;border:1px solid #dce5ed;border-radius:12px;background:#fff;color:#213f60;box-shadow:0 9px 25px rgba(26,57,88,.04)}
.mode-card:hover:not(:disabled){border-color:#65a5aa;box-shadow:0 14px 27px rgba(26,57,88,.1)}
.mode-card span:nth-child(2){display:grid;gap:8px}
.mode-card strong{font-size:1.19rem}
.mode-card small{color:#60778b;line-height:1.5}
.mode-icon{width:49px;height:49px;display:grid;place-items:center;flex:none;border-radius:9px;background:#e5f1f1;color:#117a80;font-size:1.65rem}
.mode-arrow{margin-left:auto;color:#117a80;font-size:1.4rem}
.upcoming-note{text-align:center;color:#6c7f90;font-size:.84rem;margin-top:24px}
.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}
.subject-card{display:flex;flex-direction:column;justify-content:space-between;gap:20px;padding:22px;text-align:left;background:#fff;border:1px solid #dce5ed;border-radius:10px;min-height:150px;color:#203f5f}
.subject-card:hover{border-color:#63a3aa;box-shadow:0 9px 20px rgba(26,57,88,.07)}
.subject-card strong{font-size:1rem;line-height:1.38}
.subject-card span{font-size:.82rem;color:#60788b;display:flex;justify-content:space-between}
.subject-card b{color:#117a80;font-size:1.1rem}
.setup-heading{text-align:center;max-width:700px;margin:0 auto 28px}
.setup-heading h1{color:var(--blue);font-size:clamp(1.8rem,3.5vw,2.7rem);letter-spacing:-.045em;margin:8px 0}
.setup-heading p{color:#62798c;line-height:1.55;margin:0}
.setup-card{max-width:760px;margin:auto;padding:28px 32px 30px}
.setup-row{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:8px 0 22px;margin-bottom:18px;border-bottom:1px solid #e3ebf0}
.setup-row h2{font-size:1.07rem;color:#233f61;margin:0 0 5px}
.setup-row p{font-size:.86rem;color:#6a7e8f;margin:0}
.setup-number{display:grid;gap:5px;min-width:125px;color:#49657b;font-size:.77rem;font-weight:750}
.setup-number input{width:125px;height:43px;border:1px solid #cbd9e4;border-radius:8px;padding:8px 10px;color:#213e5e;font-weight:800;background:#fff}
.setup-number small{font-weight:500;color:#708497}
.reveal-options{border:0;padding:0;margin:0}
.reveal-options legend{font-size:1.07rem;font-weight:750;color:#233f61;margin-bottom:13px}
.reveal-options label{display:flex;align-items:flex-start;gap:12px;border:1px solid #dbe5ed;border-radius:10px;padding:14px 16px;margin:9px 0;cursor:pointer;background:#fff}
.reveal-options label:has(input:checked){border-color:#388d91;background:#f0f9f9}
.reveal-options input{width:18px;height:18px;margin:2px 0 0;accent-color:#087f83;flex:none}
.reveal-options span{display:grid;gap:4px}.reveal-options b{color:#223f61;font-size:.9rem}.reveal-options small{color:#627a8b;line-height:1.45}
.setup-actions{display:flex;justify-content:flex-end;margin-top:22px}.setup-actions .button{min-width:200px}
.answer-hint{font-size:.82rem;color:#627a8b;margin:-7px 0 15px;line-height:1.5}
.answer-wrap{display:flex;align-items:stretch;gap:8px}.answer-wrap .answer{flex:1;min-width:0}
.eliminate{flex:none;width:44px;border:1px solid #d3dfe7;border-radius:9px;background:#fff;color:#667d90;font-size:1.2rem;font-weight:700}
.eliminate:hover:not(:disabled){background:#fff4f3;border-color:#c8827e;color:#a54742}
.answer-wrap.is-eliminated .answer{opacity:.55;background:#f3f5f6}.answer-wrap.is-eliminated .answer-text{text-decoration:line-through;text-decoration-thickness:2px}
.answer-wrap.is-eliminated .eliminate{background:#e8f3f4;color:#167a81;border-color:#8ac1c3}
.saved-choice{color:#317982;font-size:.84rem;font-weight:700;margin:15px 0 0}
.session-result{max-width:760px;margin:30px auto;padding:36px 40px}.session-result h1{font-size:2.3rem;color:var(--blue);margin:7px 0}.session-result p{color:#637b8d;line-height:1.55}.session-result .score{margin:22px 0}.result-actions{display:flex;gap:10px;flex-wrap:wrap}
@media(max-width:1050px){.header-inner{gap:20px}.top-nav{gap:14px}.top-nav button{font-size:.72rem}.period-grid{gap:20px}.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.header-inner{flex-wrap:wrap;min-height:0;gap:12px;padding:14px 17px}.brand-link{font-size:1.17rem}.top-nav{order:3;justify-content:flex-start;width:100%;flex:none;gap:18px;overflow-x:auto}.top-nav button{font-size:.7rem}.header-search{margin-left:auto;width:145px}.main{padding:24px 16px 55px}.home-main{padding-top:42px}.home-intro{margin-bottom:35px}.period-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.period-card{min-height:145px;padding:20px}.period-card strong{font-size:1rem}.mode-grid{grid-template-columns:1fr}.footer-inner{flex-wrap:wrap}.footer-inner small{margin-left:0;width:100%}}
@media(max-width:490px){.header-search{width:120px}.period-grid,.subject-grid{grid-template-columns:1fr}.period-card{min-height:126px}.home-intro h1{font-size:2rem}.mode-card{min-height:130px;padding:18px}.site-footer{padding:23px 17px}}
@media(max-width:490px){.setup-card{padding:20px}.setup-row{align-items:flex-start;gap:14px}.setup-number{min-width:100px}.setup-number input{width:100px}.setup-actions .button{width:100%}.session-result{padding:24px}.session-result h1{font-size:1.8rem}.eliminate{width:39px}}