:root{--ink:#253653;--purple:#7451d6;--mint:#dff7ec;--gold:#ffe18a;--line:#e4dff1}*{box-sizing:border-box}body{margin:0;background:linear-gradient(135deg,#f4efff,#fffbed 65%,#effbf5);color:var(--ink);font-family:ui-rounded,'Trebuchet MS',Arial,sans-serif;min-height:100dvh}button,input,a{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}a{color:#6440bd}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #6843c7;outline-offset:4px}.wrap{max-width:980px;margin:auto;padding:24px}header{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{font-size:30px;font-weight:900;text-decoration:none;color:var(--ink)}.brand span{color:var(--purple)}.small{font-size:14px;color:#58637c}.sub{margin:8px 0;line-height:1.6}.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;border:0;background:var(--purple);color:white;border-radius:16px;padding:13px 20px;font-weight:bold;min-height:48px;text-decoration:none}.btn.ghost{background:white;color:#5b3aa7;border:1px solid var(--line)}.btn:disabled{cursor:default;opacity:.6}.intro{text-align:center;max-width:640px;margin:50px auto 30px}.intro h1{font-size:clamp(30px,6vw,48px);line-height:1.15;margin:16px 0}.bee{width:130px;height:120px;animation:float 3s ease-in-out infinite}.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;max-width:740px;margin:24px auto}.grade{display:flex;flex-direction:column;align-items:center;text-align:center;text-decoration:none;color:var(--ink);border:2px solid #d6c9ee;background:#fff;border-radius:28px;padding:30px;box-shadow:0 8px 0 #e4dcf4;transition:transform .15s}.grade:nth-child(2){border-color:#a8dfc3;box-shadow:0 8px 0 #d5ecdf}.grade:hover{transform:translateY(-4px)}.grade .number{font-size:64px;font-weight:900;color:var(--purple)}.grade:nth-child(2) .number{color:#288b66}.grade h2{font-size:28px;margin:4px 0}.grade p{line-height:1.5}.grade .go{padding:12px 24px;background:#ede6ff;border-radius:14px;font-weight:bold}.grade:nth-child(2) .go{background:#dff7ec}footer{text-align:center;font-size:13px;line-height:1.6;padding:35px 12px;color:#5e6880}.stats{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:18px 0}.pill{border:1px solid var(--line);border-radius:99px;background:#fff;padding:10px 16px;font-weight:bold}.card{background:white;border:1px solid var(--line);border-radius:24px;padding:clamp(18px,4vw,28px);box-shadow:0 5px 18px #50328508}.units{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.unit{text-decoration:none;color:var(--ink);display:block}.unit:hover{border-color:#ac91e0}.unit h2{font-size:22px;line-height:1.35}.unit p{line-height:1.6}.unit progress{width:100%;accent-color:#37ad7f}.unit.done{background:#effbf4;border-color:#9bd9b5}.menu{display:grid;gap:12px;margin:22px 0}.lesson-link{display:flex;gap:14px;align-items:center;text-decoration:none;color:var(--ink);padding:17px;border:1px solid var(--line);border-radius:17px;background:#fff;line-height:1.45}.lesson-link .count{background:#f1eaff;padding:10px;border-radius:12px;font-weight:bold}.lesson-link .check{margin-left:auto}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}.tabs a{flex:1;text-align:center;text-decoration:none;background:#f4f0fb;border:1px solid var(--line);padding:14px;border-radius:14px;color:#5b3aa7;font-weight:bold;min-width:95px}.tabs a[aria-current=step]{background:var(--purple);color:#fff}.rule{background:#eaf8f0;border-left:5px solid #42ae83;padding:20px;border-radius:15px;line-height:1.8;font-size:18px}.steps{line-height:1.9;padding-left:30px;font-size:18px}.steps li{padding:8px 4px}.tip{background:#fff7d8;border-radius:14px;padding:16px;line-height:1.6}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.answers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:20px}.answer{border:2px solid var(--line);background:#fff;border-radius:15px;min-height:58px;padding:15px;color:var(--ink);font-weight:bold;overflow-wrap:anywhere}.answer:hover{border-color:#a88ddd}.answer.good{background:#e7f9ef;border-color:#36a36e}.answer.bad{background:#fff0ef;border-color:#d06b65}.feedback{min-height:54px;line-height:1.7;padding-top:12px}.question{font-size:22px;line-height:1.5}.speech{background:#fff8df;border-radius:16px;padding:14px;line-height:1.6}.notice{padding:18px;text-align:center;background:#f2ecff;border-radius:18px;line-height:1.7;margin-top:22px}.visual{max-width:530px;margin:20px auto;overflow:auto;background:#f7f4ff;border-radius:16px;padding:12px}.visual svg{display:block;width:100%;height:auto}.visual table{width:100%;border-collapse:collapse;text-align:center}.visual th,.visual td{padding:9px;border:1px solid #d7c8ec}.visual th{font-size:12px}.profile{max-width:540px;margin:24px auto}.profile label{display:block;font-weight:bold;margin:16px 0 6px}.profile input{width:100%;border:2px solid var(--line);padding:14px;border-radius:13px}.profile h1{font-size:30px}.celebrate{animation:pop .6s ease-in-out}.grade-header{text-align:center;margin:28px 0}.grade-header h1{font-size:clamp(28px,5vw,40px)}.progress-label{font-size:14px}.practice-toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin:20px 0}.heading{font-size:clamp(26px,5vw,36px);line-height:1.3}.quiz-card{margin:16px 0}.grade-switch{white-space:nowrap}.hidden{display:none!important}@keyframes float{50%{transform:translateY(-6px) rotate(2deg)}}@keyframes pop{50%{transform:scale(1.03)}}@media(max-width:600px){.wrap{padding:18px}.choices{gap:14px}.grade{padding:22px 12px}.grade h2{font-size:24px}.grade .number{font-size:50px}.grade p{font-size:14px}.intro{margin-top:30px}.units{grid-template-columns:1fr}.answers{grid-template-columns:1fr}.brand{font-size:26px}.grade-switch{padding:10px 12px;font-size:14px}.actions .btn{flex:1}.visual{padding:8px}.steps{font-size:17px}.visual table{min-width:420px}}@media(max-width:350px){.choices{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* Keep the two grade choices aligned at every screen width. */
.choices{align-items:stretch}.choices .grade{height:100%;min-width:0;gap:0}.choices .grade p{flex:1;width:100%;margin:16px 0 20px;line-height:1.6}.choices .grade .go{display:flex;align-items:center;justify-content:center;width:100%;margin-top:auto;min-height:66px;padding:12px 10px;font-size:clamp(14px,3.7vw,17px)}
.home-buzzy{display:block;width:160px;height:160px;object-fit:cover;border-radius:32px;margin:0 auto 20px;box-shadow:0 7px 20px #7451d61a;animation:float 3s ease-in-out infinite}
@media(prefers-reduced-motion:reduce){.home-buzzy{animation:none}}


.instagram-link{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:1px solid #d7c9ee;border-radius:13px;color:#7451d6;background:#fff;vertical-align:middle;margin-left:5px;text-decoration:none}.instagram-link:hover{background:#f1eaff}.instagram-link svg{display:block;flex:none}


/* Instagram's familiar app palette with a white camera mark. */
.instagram-link{color:#fff;border:0;background:radial-gradient(circle at 28% 108%,#feda75 0%,#fa7e1e 30%,#d62976 57%,#962fbf 78%,#4f5bd5 100%);box-shadow:0 3px 10px #d6297624}
.instagram-link:hover{background:radial-gradient(circle at 28% 108%,#feda75 0%,#fa7e1e 30%,#d62976 57%,#962fbf 78%,#4f5bd5 100%);filter:brightness(1.08)}
.practice-hints{border:1px solid #d9cdef;background:#faf7ff;border-radius:16px;padding:12px 16px;margin-top:12px;line-height:1.7}.practice-hints summary{cursor:pointer;color:#6440bd;font-weight:bold;min-height:44px;padding:10px 0}.practice-hints>details{border-top:1px solid #e6dff2;padding:8px 0}.practice-hints p{margin:10px 0}.practice-hints .quiz-card{box-shadow:none;padding:16px}

/* Practice navigation: one full-width button per row on narrow screens. */
.practice-question-navigation{display:grid!important;grid-template-columns:minmax(0,1fr)!important;gap:12px!important}.practice-question-navigation>button{box-sizing:border-box!important;width:100%!important;max-width:none!important;min-height:56px!important;justify-content:center!important;text-align:center!important}