*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#f5f7fb;color:#1f2937}.app{display:flex;min-height:100vh}.sidebar{width:250px;background:linear-gradient(180deg,#063b78,#03264f);color:#fff;padding:18px;position:fixed;left:0;top:0;bottom:0}.logo-box{display:flex;gap:12px;align-items:center;margin-bottom:25px}.logo-box img,.brand-mini img{width:48px;height:48px}.logo-box h3{font-size:16px;margin:0}.logo-box p,.brand-mini span{margin:3px 0 0;font-size:12px;opacity:.8}.sidebar nav a{display:block;color:#fff;text-decoration:none;padding:12px 14px;border-radius:8px;margin-bottom:6px;font-weight:600;font-size:14px}.sidebar nav a:hover{background:#0b5ed7}.main{margin-left:250px;width:calc(100% - 250px)}.topbar{height:70px;background:#fff;border-bottom:1px solid #e5e7eb;display:flex;align-items:center;justify-content:space-between;padding:0 25px;position:sticky;top:0;z-index:5}.brand-mini{display:flex;align-items:center;gap:12px}.brand-mini strong{display:block;color:#0b3b82}.user-pill{background:#eef4ff;padding:9px 13px;border-radius:30px}.user-pill small{display:block;color:#6b7280}.content{padding:25px}.page-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.page-title h1{font-size:24px;margin:0}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:18px;box-shadow:0 8px 20px rgba(31,41,55,.05)}.stat{color:#fff}.stat h4{margin:0 0 10px;font-size:14px}.stat strong{font-size:24px}.blue{background:#0b5ed7}.green{background:#16a34a}.orange{background:#f59e0b}.red{background:#ef4444}.table-wrap{overflow:auto;background:#fff;border-radius:12px;border:1px solid #e5e7eb}table{width:100%;border-collapse:collapse}th,td{padding:12px;border-bottom:1px solid #e5e7eb;text-align:left;font-size:14px}th{background:#f8fafc;font-weight:700}.btn{display:inline-block;border:0;border-radius:7px;padding:9px 13px;text-decoration:none;cursor:pointer;font-weight:700;font-size:13px}.btn-primary{background:#0b5ed7;color:#fff}.btn-success{background:#16a34a;color:#fff}.btn-danger{background:#ef4444;color:#fff}.btn-dark{background:#111827;color:#fff}.btn-light{background:#e5e7eb;color:#111827}.form-card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:20px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.field label{display:block;font-weight:700;margin-bottom:7px}.field input,.field select,.field textarea{width:100%;padding:11px;border:1px solid #d1d5db;border-radius:8px}.actions{margin-top:18px;display:flex;gap:10px}.alert{padding:12px 14px;border-radius:8px;margin-bottom:15px}.alert-success{background:#dcfce7;color:#166534}.alert-danger{background:#fee2e2;color:#991b1b}.filters{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-bottom:15px}.invoice-box{background:#fff;border:1px solid #cbd5e1;padding:25px;max-width:900px;margin:auto}.invoice-head{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid #0b5ed7;padding-bottom:12px;margin-bottom:18px}.school-info{display:flex;gap:15px;align-items:center}.school-info img{width:70px}.invoice-badge{background:#0b5ed7;color:#fff;padding:8px 18px;border-radius:6px;font-weight:800}.summary-bar{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;padding:15px;display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:18px}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#063b78,#0b5ed7)}.login-box{width:390px;background:#fff;border-radius:16px;padding:28px;box-shadow:0 20px 60px rgba(0,0,0,.2)}.login-box img{width:70px;display:block;margin:0 auto 10px}.login-box h2{text-align:center;margin:0 0 20px;color:#063b78}@media(max-width:900px){.sidebar{position:static;width:100%}.app{display:block}.main{margin-left:0;width:100%}.grid,.form-grid,.filters,.summary-bar{grid-template-columns:1fr}.topbar{height:auto;padding:12px;gap:10px;flex-wrap:wrap}}@media print{.sidebar,.topbar,.no-print,.page-title{display:none!important}.main{margin:0;width:100%}.content{padding:0}.invoice-box{border:0;max-width:100%}body{background:#fff}}
/* =========================
   MOBILE RESPONSIVE FIXES
========================= */

* {
    box-sizing: border-box;
}

html,
body {
    max-width: 100%;
    overflow-x: hidden;
}

/* Main layout */
@media (max-width: 992px) {
    .sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        width: 250px;
        height: 100vh;
        z-index: 9999;
        transition: 0.3s ease;
    }

    .sidebar.active {
        left: 0;
    }

    .main-content,
    .content,
    .page-content {
        margin-left: 0 !important;
        width: 100% !important;
        padding: 15px !important;
    }

    .topbar,
    .header {
        width: 100%;
        padding: 12px 15px;
    }
}

/* Cards */
@media (max-width: 768px) {
    .cards,
    .dashboard-cards,
    .stats-grid,
    .summary-row {
        grid-template-columns: 1fr !important;
        gap: 12px;
    }

    .card,
    .stat-card {
        width: 100%;
    }
}

/* Page title */
@media (max-width: 768px) {
    .page-title {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 10px;
    }

    .page-title h1 {
        font-size: 22px;
    }

    .page-title div {
        width: 100%;
    }

    .page-title .btn,
    .page-title a,
    .page-title button {
        width: 100%;
        margin-bottom: 6px;
        text-align: center;
    }
}

/* Forms */
@media (max-width: 768px) {
    form {
        width: 100%;
    }

    .form-row,
    .row,
    .filter-row {
        display: block !important;
    }

    .form-group,
    .col,
    .col-md-3,
    .col-md-4,
    .col-md-6 {
        width: 100% !important;
        margin-bottom: 12px;
    }

    input,
    select,
    textarea,
    button {
        width: 100%;
        max-width: 100%;
    }
}

/* Tables */
@media (max-width: 768px) {
    table {
        min-width: 700px;
    }

    .table-responsive,
    .table-wrap,
    .card table {
        overflow-x: auto;
        display: block;
        width: 100%;
    }

    th,
    td {
        white-space: nowrap;
        font-size: 13px;
    }
}

/* Buttons */
@media (max-width: 576px) {
    .btn,
    button,
    input[type="submit"] {
        width: 100%;
        margin-bottom: 6px;
    }

    .action-buttons,
    .actions {
        display: flex;
        flex-direction: column;
        gap: 6px;
    }
}

/* Invoice mobile */
@media (max-width: 768px) {
    .compact-invoice,
    .modern-invoice,
    .invoice-box {
        width: 100%;
        padding: 15px !important;
        overflow-x: auto;
    }

    .invoice-header,
    .invoice-top {
        flex-direction: column;
        gap: 12px;
    }

    .school-left,
    .school-block {
        flex-direction: column;
        align-items: flex-start;
    }

    .invoice-right,
    .invoice-meta {
        text-align: left;
    }

    .student-table,
    .fee-table,
    .invoice-info-table,
    .invoice-payment-table {
        min-width: 650px;
    }

    .footer-row,
    .invoice-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 35px;
    }
}

/* Login page */
@media (max-width: 576px) {
    .login-box,
    .login-card {
        width: 92%;
        padding: 22px;
        margin: 30px auto;
    }

    .login-box h2,
    .login-card h2 {
        font-size: 22px;
    }
}

/* Print should remain clean */
@media print {
    .sidebar,
    .topbar,
    .header,
    .footer,
    .no-print {
        display: none !important;
    }

    body {
        overflow: visible !important;
    }

    table {
        min-width: unset !important;
    }
}
.hamburger-btn {
    display: none;
    background: #003b7a;
    color: #fff;
    border: none;
    font-size: 22px;
    width: 42px;
    height: 42px;
    border-radius: 6px;
    cursor: pointer;
}

.mobile-overlay {
    display: none;
}

@media (max-width: 992px) {
    .hamburger-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        margin-right: 10px;
    }

    .topbar,
    .header {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .sidebar {
        position: fixed !important;
        left: -270px;
        top: 0;
        width: 260px;
        height: 100vh;
        z-index: 9999;
        transition: 0.3s ease;
        overflow-y: auto;
    }

    .sidebar.active {
        left: 0;
    }

    .mobile-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.45);
        z-index: 9998;
    }

    .mobile-overlay.active {
        display: block;
    }

    .main,
    .main-content,
    .content,
    .page-content {
        margin-left: 0 !important;
        width: 100% !important;
    }
}

/* ======================
   SIDEBAR DESIGN
====================== */

.sidebar {
    width: 260px;
    background: #0f172a;
    color: #fff;
    min-height: 100vh;
}

.logo-box {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.logo-box img {
    width: 55px;
    height: 55px;
    object-fit: contain;
    background: #fff;
    border-radius: 50%;
    padding: 4px;
}

.logo-box h3 {
    margin: 0;
    font-size: 15px;
    color: #fff;
    line-height: 1.3;
}

.logo-box p {
    margin: 2px 0 0;
    color: #94a3b8;
    font-size: 12px;
}

.sidebar-nav {
    padding: 15px 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px 20px;
    color: #cbd5e1;
    text-decoration: none;
    transition: .25s ease;
    border-left: 3px solid transparent;
}

.sidebar-nav a i {
    width: 20px;
    text-align: center;
    font-size: 15px;
}

.sidebar-nav a:hover {
    background: rgba(255,255,255,.05);
    color: #fff;
    border-left-color: #3b82f6;
}

.sidebar-nav a.active {
    background: rgba(59,130,246,.15);
    color: #fff;
    border-left-color: #3b82f6;
}

.logout-link {
    margin-top: 15px;
    color: #fca5a5 !important;
}

.logout-link:hover {
    background: rgba(239,68,68,.15) !important;
    border-left-color: #ef4444 !important;
}