:root{--navy:#243b53;--text:#334e68;--muted:#627d98;--accent:#85658f;--light:#f1e9f3;--page:#f7f1f8;--border:#e4d8e7;--shadow:0 12px 30px rgba(44,92,94,.08)}
*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--text);font-family:Arial,Helvetica,sans-serif;line-height:1.65}
.announcement-bar{padding:10px 20px;background:#e1b954;color:var(--navy);text-align:center;font-weight:800}
.site-header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:16px clamp(18px,5vw,70px);background:white;border-bottom:1px solid var(--border)}
.logo{color:var(--navy);font-weight:900;text-decoration:none;font-size:1.25rem}.main-navigation{display:flex;gap:8px;flex-wrap:wrap}.main-navigation a{padding:8px 11px;border-radius:11px;text-decoration:none;color:var(--muted);font-weight:750}
.topic-hero{display:grid;grid-template-columns:1.2fr .8fr;gap:35px;align-items:center;width:min(1120px,calc(100% - 34px));margin:38px auto;padding:clamp(30px,5vw,58px);border:1px solid var(--border);border-radius:32px;background:linear-gradient(135deg,#f9fdfd,#f1e9f3);box-shadow:var(--shadow)}
.topic-label{color:var(--accent);font-weight:900;letter-spacing:.1em}.topic-hero h1{margin:8px 0;color:var(--navy);font-size:clamp(2.8rem,6vw,5rem)}.topic-hero p{max-width:670px}
.primary-button{display:inline-flex;margin-top:18px;padding:13px 20px;border-radius:14px;background:var(--navy);color:white;text-decoration:none;font-weight:850}
.hero-mini-chart{display:flex;align-items:flex-end;justify-content:center;gap:16px;height:240px;padding:35px;border:1px solid var(--border);border-radius:28px;background:white;box-shadow:var(--shadow)}
.hero-mini-chart span{width:35px;border-radius:9px 9px 0 0;background:var(--accent)}.hero-mini-chart span:nth-child(1){height:65px}.hero-mini-chart span:nth-child(2){height:125px}.hero-mini-chart span:nth-child(3){height:180px}.hero-mini-chart span:nth-child(4){height:105px}
.page-section{width:min(1120px,calc(100% - 34px));margin:40px auto}.section-heading{text-align:center}.section-heading h2{color:var(--navy);font-size:2rem}
.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.lesson-card{display:flex;flex-direction:column;padding:23px;border:1px solid var(--border);border-radius:22px;background:white;box-shadow:var(--shadow);color:inherit;text-decoration:none}.lesson-top{display:flex;justify-content:space-between}.lesson-number,.lesson-status{font-weight:850;color:var(--accent)}.lesson-icon{font-size:2rem;margin:18px 0 5px}.lesson-card h3{margin:6px 0;color:var(--navy)}.lesson-open-text{margin-top:auto;padding-top:18px;color:var(--navy);font-weight:850}
.site-footer{margin-top:60px;padding:35px 20px;background:var(--navy);color:white;text-align:center}
@media(max-width:820px){.topic-hero{grid-template-columns:1fr}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.site-header{align-items:flex-start;flex-direction:column}}
@media(max-width:560px){.lesson-grid{grid-template-columns:1fr}}