*{margin:0;padding:0;box-sizing:border-box;}body{background:linear-gradient(145deg,#f9fcfb 0%,#eef7f5 100%);font-family:'Segoe UI','PingFang SC',Roboto,system-ui,-apple-system,'Helvetica Neue',sans-serif;padding:2rem 1.5rem 1rem;min-height:100vh;display:flex;flex-direction:column;align-items:center;}.container{max-width:1360px;width:100%;background:rgba(255,255,255,0.70);backdrop-filter:blur(2px);border-radius:48px 48px 32px 32px;padding:2rem 2rem 1.5rem;box-shadow:0 20px 40px -12px rgba(0,60,60,0.15),0 8px 24px -6px rgba(0,40,40,0.08);border:1px solid rgba(255,255,240,0.6);}.header{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;margin-bottom:2rem;border-bottom:3px dashed #b0d9d0;padding-bottom:0.75rem;}.header h1{font-size:2.2rem;font-weight:700;letter-spacing:-0.02em;background:linear-gradient(135deg,#2f9b8f,#3cb9a8);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:0 2px 5px rgba(60,185,168,0.15);display:inline-flex;align-items:center;gap:0.5rem;}.header h1 small{font-size:1rem;font-weight:400;background:#fdeaa8;padding:0.2rem 0.9rem;border-radius:40px;color:#2f5e55;letter-spacing:0.3px;box-shadow:inset 0 -2px 0 #f7d86b;}.header .badge{background:#ffd966;padding:0.3rem 1.2rem;border-radius:60px;font-weight:600;font-size:0.9rem;color:#2f5e55;box-shadow:0 4px 8px rgba(255,215,0,0.2);border:1px solid #ffe28a;}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem;margin:1.2rem 0 1.8rem;}.card{background:white;border-radius:28px;padding:0.9rem 1.2rem 0.9rem 1.2rem;box-shadow:0 6px 14px rgba(0,40,40,0.04),0 2px 6px rgba(0,30,30,0.03);transition:all 0.2s ease;border:1px solid #e2f0ed;display:flex;align-items:center;gap:0.6rem;backdrop-filter:blur(2px);background:rgba(255,255,255,0.85);min-height:70px;}.card:hover{transform:translateY(-3px) scale(1.01);box-shadow:0 16px 28px -8px rgba(60,150,140,0.15),0 6px 12px rgba(0,0,0,0.02);border-color:#9ed1c6;background:white;}.card-index{font-weight:700;font-size:1.2rem;background:#dff3ef;width:2.4rem;height:2.4rem;display:flex;align-items:center;justify-content:center;border-radius:40% 60% 40% 60% / 50% 40% 60% 50%;color:#1d6b60;flex-shrink:0;box-shadow:inset 0 -2px 0 #b8ddd4;}.card-content{flex:1;min-width:0;}.card-title{font-weight:700;font-size:1rem;color:#1a4e47;line-height:1.3;display:flex;flex-wrap:wrap;align-items:baseline;gap:0.2rem 0.4rem;}.card-sub{font-size:0.75rem;color:#4f7a72;display:block;margin-top:0.15rem;opacity:0.85;letter-spacing:0.2px;line-height:1.3;font-weight:400;border-left:2px solid #b7dbd2;padding-left:0.5rem;}.card-link{text-decoration:none;color:inherit;display:flex;align-items:center;gap:0.6rem;width:100%;}.card-link:visited .card-index{background:#cbe6e0;}.card-link:visited .card-title{color:#3b6b62;}.chapter-link{font-size:0.7rem;background:#f5fbf9;border-radius:30px;padding:0.1rem 0.6rem;color:#2b7b6e;font-weight:500;border:1px solid #c7e3db;white-space:nowrap;margin-left:auto;transition:0.1s;}.card:hover .chapter-link{background:#c2e3da;border-color:#7fc0b2;}.footer{margin-top:1.2rem;padding-top:1.2rem;border-top:2px dotted #c7ddd6;display:flex;justify-content:center;align-items:center;gap:0.8rem;flex-wrap:wrap;color:#2b6b61;font-weight:500;font-size:1rem;}.footer span{background:#f7fcf9;padding:0.2rem 1.8rem;border-radius:60px;letter-spacing:1px;box-shadow:inset 0 -1px 0 #b7d3cb;}.footer small{opacity:0.7;font-weight:400;}@media (max-width:640px){body{padding:1rem 0.8rem;}.container{padding:1.2rem 1rem;border-radius:32px;}.header h1{font-size:1.6rem;}.course-grid{grid-template-columns:1fr;gap:0.8rem;}.card{padding:0.7rem 0.9rem;min-height:60px;}.card-index{width:2rem;height:2rem;font-size:1rem;}}@media (min-width:768px) and (max-width:1024px){.course-grid{grid-template-columns:repeat(2,1fr);}}.dot-decoration{display:inline-block;width:6px;height:6px;background:#fbc4ab;border-radius:50%;margin:0 0.2rem;}