:root{--eco-dark:#123d2d;--eco:#198754;--eco-light:#eaf7f0;--sky:#eaf5ff}body{background:#f5f7f6;color:#23332c}.eco-navbar{background:linear-gradient(100deg,#123d2d,#198754)}.login-bg{background:radial-gradient(circle at top left,#dff7e9,#edf7ff 50%,#f8faf9)}.login-card{width:min(430px,94vw);background:#fff;border-radius:24px;padding:2.2rem}.card{border-radius:16px}.eco-stat{border:0;box-shadow:0 .25rem 1rem rgba(24,65,45,.08);transition:.2s}.eco-stat:hover{transform:translateY(-2px)}.table thead th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:#6d7972;background:#f8faf9;border-bottom-width:1px}.rank-circle{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#e8f5ed;color:#176d45;font-weight:700}.rank-1{background:#ffe9a8;color:#725500}.rank-2{background:#e9edf1;color:#47515a}.rank-3{background:#f2d2b4;color:#79502e}.top-rank{background:#fffdf4}.material-icon{width:64px;height:64px;border-radius:18px;display:grid;place-items:center;font-size:2rem}.challenge-meta{display:grid;gap:.5rem;font-size:.92rem}.clamp-3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.assignment-list{max-height:520px;overflow:auto}.img-preview{max-width:100%;max-height:360px;border-radius:14px;border:1px solid #dbe4df}.evidence-image{width:100%;max-height:680px;object-fit:contain;background:#111;border-radius:16px}.progress{height:20px;border-radius:20px}.btn,.form-control,.form-select,.input-group-text{border-radius:10px}.dropdown-menu{border:0;box-shadow:0 .5rem 1.5rem rgba(0,0,0,.12)}@media(max-width:576px){.login-card{padding:1.5rem}.display-6{font-size:1.7rem}.table{font-size:.88rem}}