:root{--primary:#1b5e20;--primary-light:#2e7d32;--primary-dark:#0d3311;--accent:#ffc107;--sidebar-w:260px;--topbar-h:60px;--border:#e2e8f0;--bg:#f4f6f9;--bg-card:#fff;--text:#1e293b;--text2:#64748b;--shadow:0 1px 3px rgba(0,0,0,.08);--radius:10px;--tr:.25s ease}
[data-bs-theme="dark"]{--bg:#0f172a;--bg-card:#1e293b;--text:#e2e8f0;--text2:#94a3b8;--border:#334155;--shadow:0 1px 3px rgba(0,0,0,.3)}
*,*::before,*::after{box-sizing:border-box}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);margin:0;min-height:100vh}
a{text-decoration:none;color:inherit}
.wrapper{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar-w);background:var(--primary);color:#fff;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:1040;transition:transform var(--tr);overflow-y:auto}
.sidebar-brand{display:flex;align-items:center;gap:10px;padding:20px 22px;font-size:1.25rem;font-weight:800;border-bottom:1px solid rgba(255,255,255,.15)}
.sidebar-brand i{font-size:1.6rem;color:var(--accent)}
.sidebar-nav{flex:1;padding:12px 10px;display:flex;flex-direction:column;gap:2px}
.sidebar-link{display:flex;align-items:center;gap:12px;padding:11px 16px;border-radius:8px;color:rgba(255,255,255,.75);font-size:.875rem;font-weight:500;transition:all var(--tr)}
.sidebar-link:hover{background:rgba(255,255,255,.12);color:#fff}
.sidebar-link.active{background:rgba(255,255,255,.18);color:#fff;font-weight:600}
.sidebar-link i{width:20px;text-align:center}
.sidebar-footer{padding:14px 20px;border-top:1px solid rgba(255,255,255,.12);text-align:center;color:rgba(255,255,255,.5);font-size:.75rem}
.main-content{flex:1;margin-left:var(--sidebar-w);transition:margin-left var(--tr);min-height:100vh;display:flex;flex-direction:column}
.topbar{height:var(--topbar-h);background:var(--bg-card);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 24px;gap:16px;box-shadow:var(--shadow);position:sticky;top:0;z-index:1020}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.content-area{flex:1;padding:24px}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.kpi-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);transition:all var(--tr);overflow:hidden}
.kpi-card:hover{box-shadow:0 4px 12px rgba(0,0,0,.1);transform:translateY(-2px)}
.kpi-card .kpi-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;margin-bottom:12px}
.kpi-card .kpi-value{font-size:1.75rem;font-weight:800;line-height:1.1;margin-bottom:2px}
.kpi-card .kpi-label{font-size:.8rem;color:var(--text2);font-weight:500;text-transform:uppercase;letter-spacing:.5px}
.kpi-green .kpi-icon{background:#dcfce7;color:#16a34a}
.kpi-blue .kpi-icon{background:#dbeafe;color:#2563eb}
.kpi-amber .kpi-icon{background:#fef3c7;color:#d97706}
.kpi-red .kpi-icon{background:#fee2e2;color:#dc2626}
.kpi-purple .kpi-icon{background:#f3e8ff;color:#7c3aed}
.kpi-teal .kpi-icon{background:#ccfbf1;color:#0d9488}
.table{color:var(--text)}
.table thead th{background:var(--bg);font-size:.78rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text2);border-bottom:2px solid var(--border);white-space:nowrap;padding:10px 14px}
.table tbody td{padding:12px 14px;vertical-align:middle;border-color:var(--border);font-size:.875rem}
.table-hover tbody tr:hover{background:rgba(27,94,32,.04)}
.badge-skill-beginner{background:#dbeafe;color:#1d4ed8}.badge-skill-intermediate{background:#fef3c7;color:#b45309}.badge-skill-advanced{background:#dcfce7;color:#15803d}
.badge-status-active{background:#dcfce7;color:#16a34a}.badge-status-inactive{background:#fee2e2;color:#dc2626}.badge-status-hold{background:#fef3c7;color:#d97706}
.badge-fee-paid{background:#dcfce7;color:#16a34a}.badge-fee-partial{background:#fef3c7;color:#d97706}.badge-fee-pending{background:#fee2e2;color:#dc2626}.badge-fee-overdue{background:#fce4ec;color:#c62828}
.btn-primary{background:var(--primary);border-color:var(--primary)}.btn-primary:hover{background:var(--primary-light);border-color:var(--primary-light)}
.btn-accent{background:var(--accent);border-color:var(--accent);color:#1e293b;font-weight:600}.btn-accent:hover{background:#e6a800;color:#1e293b}
.page-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-bottom:24px}
.page-header h4{font-weight:700;margin:0}
.chart-container{position:relative;height:280px}
.form-label{font-weight:500;font-size:.875rem}
.form-control,.form-select{border-radius:8px;border-color:var(--border);font-size:.875rem}
.form-control:focus,.form-select:focus{border-color:var(--primary-light);box-shadow:0 0 0 .2rem rgba(27,94,32,.15)}
.auth-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary-dark),var(--primary),var(--primary-light));padding:20px}
.auth-card{background:#fff;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.25);width:100%;max-width:420px;padding:40px}
.auth-card .auth-brand{text-align:center;margin-bottom:28px}
.auth-card .auth-brand i{font-size:2.5rem;color:var(--primary);margin-bottom:10px;display:block}
.auth-card .auth-brand h4{font-weight:800;color:var(--primary);margin:0}
.auth-card .auth-brand small{color:var(--text2);font-size:.82rem}
.pagination .page-link{color:var(--primary);border-color:var(--border);font-size:.85rem}
.pagination .page-item.active .page-link{background:var(--primary);border-color:var(--primary)}
.student-photo{width:40px;height:40px;border-radius:50%;object-fit:cover;border:2px solid var(--border)}
.student-photo-lg{width:100px;height:100px;border-radius:50%;object-fit:cover;border:3px solid var(--primary)}
@media(max-width:991.98px){.sidebar{transform:translateX(-100%)}.sidebar.show{transform:translateX(0)}.main-content{margin-left:0}.sidebar-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:1039;display:none}.sidebar-backdrop.show{display:block}}
@media(max-width:575.98px){.content-area{padding:16px}.kpi-card .kpi-value{font-size:1.3rem}}