:root{--bg-gradient:linear-gradient(180deg,#f3f7ff 0%, #fff5fb 100%);--card-bg:#ffffff;--muted:#6b7a89;--accent1:#7fb3ff;--accent2:#f7c6e6;--primary:linear-gradient(90deg,var(--accent1),var(--accent2));}
*{box-sizing:border-box;font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, Arial;}
body.bg-soft{min-height:100vh;margin:0;background:var(--bg-gradient);color:#24303f;}
.layout{display:flex;min-height:100vh}
.sidebar{width:220px;background:rgba(255,255,255,0.6);backdrop-filter:blur(6px);padding:18px;border-right:1px solid rgba(10,20,40,0.04)}
.sidebar.narrow{width:180px}
.sidebar-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.logo{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,#a6c1ff,#fbd3e9);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}
.logo.small{width:40px;height:40px}
.school-name{font-weight:700;font-size:18px}
.nav{display:flex;flex-direction:column;gap:8px;margin-top:6px}
.nav-item{padding:10px;border-radius:8px;color:#24303f;text-decoration:none;font-weight:600}
.nav-item.active{background:rgba(127,179,255,0.12)}
.sidebar-footer{margin-top:18px;font-size:13px;color:var(--muted)}
.main{flex:1;padding:20px}
.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.cards{display:flex;gap:12px;margin-bottom:14px}
.card{background:var(--card-bg);padding:16px;border-radius:12px;box-shadow:0 6px 18px rgba(34,40,49,0.06);flex:1;border:1px solid rgba(10,20,40,0.03)}
.card.small{flex:0 0 220px}
.card h4{margin:0;color:var(--muted);font-weight:700;font-size:13px}
.big{font-size:20px;font-weight:800;margin-top:8px}
.panel{background:transparent;margin-top:8px}
.table-wrap{overflow:auto;border-radius:10px}
.table{width:100%;border-collapse:collapse;background:var(--card-bg);border:1px solid rgba(10,20,40,0.04)}
.table th, .table td{padding:12px;text-align:left;border-bottom:1px solid rgba(10,20,40,0.03)}
.pill{display:inline-block;padding:6px 10px;border-radius:999px;font-weight:700;font-size:12px}
.paid{background:#e6ffef;color:#0a6d3a}
.pendiente{background:#fff7e6;color:#7a4f00}
.enviado{background:#e8f0ff;color:#1a4bb8}
.overdue{background:#ffecec;color:#a63b3b}
.btn{padding:8px 12px;border-radius:8px;border:1px solid rgba(10,20,40,0.06);background:transparent;cursor:pointer;font-weight:700}
.btn.primary{background:var(--primary);color:#fff;border:none;box-shadow:0 6px 18px rgba(127,179,255,0.12)}
.centered{display:grid;place-items:center;height:100vh;padding:20px}
.login-card{width:420px;padding:22px;border-radius:14px;background:linear-gradient(180deg,rgba(255,255,255,0.9),rgba(255,255,255,0.85));box-shadow:0 20px 40px rgba(34,40,49,0.06)}
.brand{display:flex;gap:12px;align-items:center;margin-bottom:12px}
.muted{color:var(--muted);margin-top:4px}
.input{width:100%;padding:10px;border-radius:8px;border:1px solid rgba(10,20,40,0.06);margin:8px 0}
.label{font-size:13px;color:var(--muted);margin-top:6px;display:block}
.alert{background:#ffecec;padding:10px;border-radius:8px;color:#a63b3b;margin-bottom:8px;font-weight:700}
.hint{margin-top:12px;color:var(--muted);font-size:13px}
.file-input{display:block;margin-top:6px}