:root{--navy:#14213d;--blue:#2563eb;--bg:#f4f7fb;--line:#dce3ee;--muted:#64748b;--green:#16a34a;--red:#dc2626}*{box-sizing:border-box}body{margin:0;font-family:"Malgun Gothic",Arial,sans-serif;background:var(--bg);color:#172033}button,.button,input{font:inherit}button,.button{border:1px solid var(--line);background:#fff;border-radius:9px;padding:10px 16px;cursor:pointer;text-decoration:none;color:inherit}.primary{background:var(--blue);color:#fff;border-color:var(--blue)}.ghost{background:transparent;color:#fff;border-color:#ffffff55}.brand{font-size:12px;letter-spacing:2px;font-weight:800;color:#60a5fa}header{height:78px;background:var(--navy);color:#fff;padding:0 5vw;display:flex;align-items:center;justify-content:space-between}header h1{font-size:20px;margin:3px 0}nav{padding:14px 5vw;background:#fff;border-bottom:1px solid var(--line);display:flex;gap:8px;overflow:auto}nav button{border:0;color:var(--muted);white-space:nowrap}nav button.active{background:#e8f0ff;color:var(--blue);font-weight:700}main{max-width:1240px;margin:auto;padding:28px 24px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.metrics article,.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px}.metrics span{color:var(--muted);display:block}.metrics strong{font-size:27px;display:block;margin-top:10px}.section-title{display:flex;align-items:center;justify-content:space-between;margin:30px 0 15px}.section-title h2{margin:0;font-size:20px}.section-title p{color:var(--muted);margin:6px 0 0;font-size:14px}.student-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.student-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.student-card .top{display:flex;justify-content:space-between;align-items:center}.badge{font-size:12px;padding:5px 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button[data-key]{font-size:14px}.submit{width:100%;font-size:18px;padding:16px}#padMessage{min-height:52px;margin-top:18px;font-size:20px;font-weight:700}.empty{color:var(--muted);padding:35px;text-align:center;grid-column:1/-1}@media(max-width:850px){.metrics{grid-template-columns:repeat(2,1fr)}.student-grid{grid-template-columns:1fr 1fr}}@media(max-width:560px){main{padding:20px 14px}.student-grid{grid-template-columns:1fr}.metrics{grid-template-columns:1fr 1fr}.metrics article{padding:16px}.metrics strong{font-size:21px}.filters{display:grid}.form-grid{grid-template-columns:1fr}}