:root {
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-light: #eef2ff;
    --success: #059669;
    --success-bg: #ecfdf5;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --warning: #d97706;
    --warning-bg: #fffbeb;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --sidebar-width: 260px;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--gray-800);
    background: var(--gray-50);
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: var(--sidebar-width);
    background: var(--gray-900);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
}

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

.sidebar__logo {
    width: 36px; height: 36px;
    background: var(--primary);
    border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 13px;
}

.sidebar__title { font-weight: 600; font-size: 15px; }

.sidebar__nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
    min-height: 0;
    -webkit-overflow-scrolling: touch;
}

.nav-link {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px;
    color: var(--gray-300);
    border-radius: var(--radius);
    margin-bottom: 4px;
    transition: all .15s;
    text-decoration: none;
}

.nav-link:hover { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.nav-link.active { background: var(--primary); color: #fff; }

.sidebar__footer {
    padding: 16px;
    border-top: 1px solid rgba(255,255,255,.1);
}

.user-info { margin-bottom: 10px; }
.user-info--link {
    display: block;
    color: inherit;
    text-decoration: none;
    border-radius: var(--radius);
    padding: 6px 8px;
    margin: -6px -8px 10px;
    transition: background .15s;
}
.user-info--link:hover { background: rgba(255,255,255,.08); text-decoration: none; }
.user-info__name { display: block; font-weight: 500; font-size: 13px; }
.user-info__role { font-size: 11px; }

.profile-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 20px;
    align-items: start;
}

.profile-info td {
    padding: 8px 0;
    border: none;
    vertical-align: top;
}
.profile-info td:first-child { width: 120px; padding-right: 12px; }
.profile-info tr:hover td { background: transparent; }

.form-divider {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: 20px 0 16px;
}

.form-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

/* Guide */
.guide-intro p { margin: 0; line-height: 1.6; }

.guide-nav__links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
}
.guide-nav__links a {
    font-size: 14px;
    text-decoration: none;
    padding: 4px 0;
}
.guide-nav__links a:hover { text-decoration: underline; }

.guide-section { scroll-margin-top: 72px; }
.guide-section--muted { opacity: .85; }

.guide-list,
.guide-steps {
    margin: 12px 0 0;
    padding-left: 20px;
    line-height: 1.7;
}
.guide-list li,
.guide-steps li { margin-bottom: 8px; }
.guide-steps { padding-left: 22px; }

.guide-note {
    margin-top: 16px;
    padding: 12px 14px;
    background: var(--primary-light);
    border-radius: var(--radius);
    font-size: 13px;
    line-height: 1.5;
    color: var(--primary-dark);
}

.guide-table th,
.guide-table td { font-size: 13px; }
.guide-table .text-center { text-align: center; }

.guide-faq__item {
    border-bottom: 1px solid var(--gray-200);
    padding: 12px 0;
}
.guide-faq__item:last-child { border-bottom: none; }
.guide-faq__item summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-800);
    list-style: none;
}
.guide-faq__item summary::-webkit-details-marker { display: none; }
.guide-faq__item summary::before {
    content: '▸ ';
    color: var(--gray-400);
}
.guide-faq__item[open] summary::before { content: '▾ '; }
.guide-faq__item p {
    margin: 10px 0 0;
    color: var(--gray-600);
    font-size: 14px;
    line-height: 1.6;
}

.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px 32px;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 12px;
}

.page-header__left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.page-title { font-size: 24px; font-weight: 700; color: var(--gray-900); }

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    background: #fff;
    cursor: pointer;
    flex-shrink: 0;
}

.menu-toggle__bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--gray-800);
    border-radius: 2px;
    transition: transform .2s, opacity .2s;
}

.menu-toggle.is-active .menu-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.menu-toggle.is-active .menu-toggle__bar:nth-child(2) {
    opacity: 0;
}
.menu-toggle.is-active .menu-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .45);
    z-index: 150;
    opacity: 0;
    transition: opacity .25s;
}

.sidebar-overlay.is-open {
    opacity: 1;
}

body.menu-open { overflow: hidden; }

/* Cards */
.card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
}

.card__title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-900);
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.student-view-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
}

.card--narrow { max-width: 500px; }
.card--medium { max-width: 600px; }
.card--wide { max-width: 700px; }

.stats-grid--single { grid-template-columns: 1fr; }

.notes-block { margin-top: 16px; }
.card-meta { margin-bottom: 16px; }
.form-hint { margin-top: 4px; font-size: 12px; }

.category-add { margin-top: 10px; }
.category-add__row {
    display: flex;
    gap: 8px;
    margin-top: 8px;
    flex-wrap: wrap;
}
.category-add__input { flex: 1; min-width: 180px; }

.pagination {
    margin-top: 20px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn--block { width: 100%; margin-top: 8px; justify-content: center; }

.is-hidden { display: none !important; }

.stat-card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border-left: 4px solid var(--primary);
}

.stat-card--income { border-left-color: var(--success); }
.stat-card--expense { border-left-color: var(--danger); }
.stat-card--balance { border-left-color: var(--warning); }

.stat-card__label { font-size: 12px; color: var(--gray-500); text-transform: uppercase; letter-spacing: .5px; }
.stat-card__value { font-size: 28px; font-weight: 700; margin-top: 4px; color: var(--gray-900); }
.stat-card--income .stat-card__value { color: var(--success); }
.stat-card--expense .stat-card__value { color: var(--danger); }

/* Tables */
.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

th {
    font-size: 12px;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: .5px;
    background: var(--gray-50);
}

tr:hover td { background: var(--gray-50); }

/* Forms */
.form-group { margin-bottom: 16px; }

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    transition: border-color .15s;
    background: #fff;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-textarea { resize: vertical; min-height: 80px; }

.form-error { color: var(--danger); font-size: 12px; margin-top: 4px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all .15s;
    line-height: 1.4;
}

.btn:hover { text-decoration: none; }
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--primary-dark); }
.btn--danger { background: var(--danger); color: #fff; }
.btn--danger:hover { background: #b91c1c; }
.btn--ghost { background: transparent; color: var(--gray-600); border: 1px solid var(--gray-300); }
.btn--ghost:hover { background: var(--gray-100); }
.btn--sm { padding: 5px 10px; font-size: 12px; min-height: 32px; }

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.badge--owner { background: #fef3c7; color: #92400e; }
.badge--admin { background: var(--primary-light); color: var(--primary-dark); }
.badge--cashier { background: var(--success-bg); color: var(--success); }
.badge--active { background: var(--success-bg); color: var(--success); }
.badge--inactive { background: var(--gray-100); color: var(--gray-500); }
.badge--graduated { background: #dbeafe; color: #1e40af; }

.badge--action-login { background: #ecfdf5; color: #059669; }
.badge--action-logout { background: var(--gray-100); color: var(--gray-600); }
.badge--action-create { background: #dbeafe; color: #1e40af; }
.badge--action-update { background: #fffbeb; color: #92400e; }
.badge--action-delete { background: var(--danger-bg); color: var(--danger); }

.category-add__panel {
    padding: 10px;
    background: var(--gray-50);
    border-radius: var(--radius);
    border: 1px solid var(--gray-200);
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
}

.alert--success { background: var(--success-bg); color: var(--success); border: 1px solid #a7f3d0; }
.alert--error { background: var(--danger-bg); color: var(--danger); border: 1px solid #fecaca; }
.alert--warning { background: var(--warning-bg); color: var(--warning); border: 1px solid #fde68a; }

/* Filters */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: flex-end;
    margin-bottom: 20px;
    padding: 16px;
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.filters .form-group { margin-bottom: 0; flex: 1; min-width: 150px; }

/* Login */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.login-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-card__title {
    font-size: 22px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
}

.login-card__subtitle {
    text-align: center;
    color: var(--gray-500);
    margin-bottom: 28px;
    font-size: 13px;
}

/* Actions in table */
.table-actions { display: flex; gap: 6px; align-items: center; }

.inline-form { display: inline; margin: 0; }

.text-right { text-align: right; }
.text-muted { color: var(--gray-500); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--gray-500);
}

/* Responsive */
@media (max-width: 768px) {
    .menu-toggle { display: flex; }

    .sidebar-overlay { display: block; pointer-events: none; }
    .sidebar-overlay.is-open { pointer-events: auto; }

    .sidebar {
        width: var(--sidebar-width);
        max-width: 85vw;
        transform: translateX(-100%);
        transition: transform .25s ease;
        z-index: 200;
    }

    .sidebar.is-open { transform: translateX(0); }

    .main { margin-left: 0; padding: 16px; }
    .page-title { font-size: 20px; }
    .form-row { grid-template-columns: 1fr; }
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }
    .page-header__left { width: 100%; }
    .page-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        width: 100%;
    }
    .page-actions .btn { flex: 1; justify-content: center; min-width: 0; }
    .stats-grid { grid-template-columns: 1fr; }
    .dashboard-grid { grid-template-columns: 1fr; }
    .student-view-grid { grid-template-columns: 1fr; }
    .profile-grid { grid-template-columns: 1fr; }
    .guide-nav__links { flex-direction: column; gap: 4px; }
    .guide-table { font-size: 12px; }
    .role-cashier .guide-table th:nth-child(3),
    .role-cashier .guide-table th:nth-child(4),
    .role-cashier .guide-table td:nth-child(3),
    .role-cashier .guide-table td:nth-child(4) { display: none; }
    .role-admin .guide-table th:nth-child(2),
    .role-admin .guide-table th:nth-child(4),
    .role-admin .guide-table td:nth-child(2),
    .role-admin .guide-table td:nth-child(4) { display: none; }
    .role-owner .guide-table th:nth-child(2),
    .role-owner .guide-table th:nth-child(3),
    .role-owner .guide-table td:nth-child(2),
    .role-owner .guide-table td:nth-child(3) { display: none; }
    .card--narrow,
    .card--medium,
    .card--wide { max-width: none; }
    .filters .form-group { flex: 1 1 100%; min-width: 0; }
    .filters .btn { flex: 1 1 auto; }
    .table-actions { flex-wrap: wrap; }
    .hide-mobile { display: none !important; }
    th.hide-mobile, td.hide-mobile { display: none; }
    .login-card { padding: 24px 20px; margin: 16px; }
}