:root{--yellow:#ffe600;--blue:#3483fa;--bg:#f5f7fb;--dark:#111827}body{background:var(--bg);font-family:Inter,Arial,sans-serif;color:#1f2937}.layout{display:flex;min-height:100vh}.sidebar{position:fixed;left:0;top:0;bottom:0;width:245px;background:#111827;color:white;padding:20px 14px}.brand{font-size:23px;font-weight:900;margin-bottom:22px;display:flex;flex-direction:column;line-height:1.1}.brand small{font-size:12px;color:#cbd5e1}.sidebar a{display:flex;gap:10px;align-items:center;text-decoration:none;color:#cbd5e1;padding:12px 14px;border-radius:12px;margin:4px 0}.sidebar a:hover{background:#2563eb;color:#fff}.content{margin-left:245px;padding:26px;width:calc(100% - 245px)}.card{border:0;border-radius:18px;box-shadow:0 10px 28px rgba(15,23,42,.07)}.btn,.form-control,.form-select{border-radius:12px}.hero{background:linear-gradient(135deg,var(--yellow),#fff4a3);border-radius:20px;padding:22px;margin-bottom:18px}.quick-title{font-weight:900;font-size:26px;margin:0}.subject-box{font-size:20px;font-weight:700;background:#fff;border:2px dashed #3483fa}.stat{background:white;border-radius:18px;padding:18px;box-shadow:0 10px 28px rgba(15,23,42,.07)}.stat .num{font-size:27px;font-weight:900}@media(max-width:900px){.layout{display:block}.sidebar{position:relative;width:100%;height:auto}.content{margin-left:0;width:100%;padding:15px}}@media print{.no-print,.sidebar{display:none}.content{margin:0;width:100%;padding:0}body{background:white}}