.study-platform .sp-main{padding-top:2.5rem;padding-bottom:4rem;min-height:65vh;position:relative}
.study-platform h1{font-size:clamp(2rem,4vw,3.2rem);max-width:960px;margin:0 0 1rem}
.study-platform h2{font-size:clamp(1.3rem,3vw,1.7rem);margin:0 0 .8rem}
.study-platform h3{font-size:1.22rem;line-height:1.4}
.study-platform p{line-height:1.75;margin:.5rem 0 1rem}
.study-platform .lead{max-width:850px;font-size:1.12rem}
.study-platform section{margin:2.5rem 0}
.study-platform .sp-eyebrow{font-size:.76rem;text-transform:uppercase;letter-spacing:.08em;font-weight:800;color:#0040bd}
.study-platform .sp-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:1.3rem 0}
.study-platform .btn{min-height:44px;white-space:normal;text-align:center;line-height:1.5}
.study-platform .sp-note{background:#eff6ff;border:1px solid #cbdcff;border-radius:20px;padding:1.5rem}
.study-platform ul,.study-platform ol{padding-left:1.4rem;line-height:1.9}
.study-platform .sp-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.25rem;margin:1.5rem 0}
.study-platform .sp-topic-card{display:flex;flex-direction:column;gap:.5rem}
.study-platform .sp-topic-card p{margin:0}
.study-platform .sp-topic-link{margin-top:auto;padding-top:1rem;font-weight:750}
.study-platform .sp-filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;align-items:end;margin:1.3rem 0}
.study-platform label{display:block;font-weight:650;line-height:1.5;margin:.7rem 0}
.study-platform input:not([type=checkbox]):not([type=radio]),.study-platform select,.study-platform textarea{display:block;width:100%;max-width:100%;padding:.8rem;border:1px solid #9dafc5;border-radius:10px;font:inherit;font-weight:400;color:#172033;background:#fff;margin-top:.5rem;min-height:44px}
.study-platform textarea{resize:vertical;line-height:1.6}
.study-platform .sp-check{display:flex;gap:.75rem;align-items:flex-start;font-weight:400}
.study-platform input[type=checkbox],.study-platform input[type=radio]{width:19px;height:19px;accent-color:#0052ff;flex-shrink:0;margin-top:.2rem}
.study-platform .sp-lesson{max-width:850px}
.study-platform .sp-quiz fieldset,.study-platform #topic-editor fieldset{border:1px solid #cbd5e1;border-radius:14px;padding:1rem;margin:1.5rem 0;min-width:0}
.study-platform legend{font-weight:750;max-width:100%;padding:0 .35rem}
.study-platform .sp-option{display:flex;gap:.75rem;align-items:center;min-height:46px;padding:.8rem;border:1px solid #d5deea;border-radius:10px;cursor:pointer;font-weight:400}
.study-platform .sp-option:has(input:checked){background:#eff6ff;border-color:#0052ff}
.study-platform .sp-feedback{border-left:4px solid #526178;background:#f1f5f9;padding:1rem;border-radius:0 10px 10px 0;margin:1rem 0}
.study-platform .sp-feedback.correct{border-color:#087f52;background:#ecfdf5}
.study-platform .sp-status{min-height:1.5rem;font-weight:600;color:#334155;overflow-wrap:anywhere}
.study-platform .sp-status.error{color:#a11929}
.study-platform .sp-account{display:grid;grid-template-columns:1.3fr 1fr;gap:2rem;align-items:start}
.study-platform .sp-small{font-size:.86rem;color:#475569}
.study-platform .sp-code{font-size:2.2rem;letter-spacing:.22em;font-weight:800;color:#003ecc}
.study-platform .sp-dashboard-top{display:flex;justify-content:space-between;align-items:center;gap:1rem}
.study-platform .sp-metric{font-size:1.8rem;font-weight:800;color:#0052ff}
.study-platform .sp-progress-row{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px solid #d5deea;padding:1rem 0}
.study-platform .sp-delete{margin:3rem 0;border:1px solid #d5deea;border-radius:16px;padding:1.3rem}
.study-platform .sp-delete summary{font-weight:750;cursor:pointer;min-height:32px}
.study-platform [hidden]{display:none!important}
.study-platform :focus-visible{outline:3px solid #0052ff;outline-offset:4px}
.study-platform .footer{position:relative}
.study-platform .sp-week{list-style:none;padding:0;display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:.6rem;margin:1.5rem 0}
.study-platform .sp-week li{display:flex;flex-direction:column;gap:.5rem;text-align:center;min-width:0;background:#eff6ff;border:1px solid #cbdcff;border-radius:12px;padding:.7rem .25rem;font-size:.85rem}
.study-platform .sp-week meter{width:100%;height:1rem;accent-color:#0052ff}
.study-platform #revision-list .card{display:flex;flex-direction:column;align-items:stretch;overflow-wrap:anywhere}
.study-platform #revision-list .sp-topic-link{display:block;margin-top:.8rem}
.study-platform #revision-attempt{scroll-margin-top:6rem}
@media(max-width:600px){.study-platform .sp-week{gap:.25rem}.study-platform .sp-week li{font-size:.72rem}.study-platform .sp-week .sp-small{font-size:.65rem}}
@media(max-width:900px){.study-platform .sp-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.study-platform .sp-account{grid-template-columns:1fr}}
@media(max-width:600px){.study-platform .sp-grid,.study-platform .sp-filters{grid-template-columns:1fr}.study-platform .sp-main{padding-top:1.5rem}.study-platform .sp-actions .btn{width:100%}.study-platform .sp-note{padding:1.15rem}.study-platform .sp-dashboard-top,.study-platform .sp-progress-row{display:block}}