/* ============ Design tokens (matches the offline desktop app's palette) ============ */
:root {
    --color-primary: #2C5AA0;
    --color-primary-dark: #1B3F72;
    --color-primary-tint: #EAEFF6;
    --color-bg: #F3F5F9;
    --color-surface: #FFFFFF;
    --color-border: #DCE2EA;
    --color-text: #1F2937;
    --color-text-secondary: #62718B;
    --color-stripe: #F4F7FB;
    --color-success: #1E7E34;
    --color-success-bg: #DCFCE7;
    --color-danger: #B02A2A;
    --color-danger-bg: #FDE8E8;
    --font-sans: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Roboto, Arial, sans-serif;
    --radius-sm: 4px;
    --radius: 6px;
    --radius-lg: 10px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, .08);
    --shadow-md: 0 6px 20px rgba(15, 23, 42, .12);
    --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-5: 24px; --space-6: 32px;
    --transition: 160ms ease;
    --touch: 44px;
    --color-heading: #1B3F72;
}

:root[data-theme="dark"] {
    --color-primary-tint: #1E2C47;
    --color-heading: #8FB4E8;
    --color-bg: #10182B;
    --color-surface: #182238;
    --color-border: #2B3B5C;
    --color-text: #E7ECF5;
    --color-text-secondary: #93A6CC;
    --color-stripe: #1B2740;
    --color-success: #4ADE80;
    --color-success-bg: #123822;
    --color-danger: #F87171;
    --color-danger-bg: #3A1B1B;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, .35);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background var(--transition), color var(--transition);
}
img, svg { max-width: 100%; }

.icon-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-primary-dark);
    color: #fff;
    padding: 10px 16px;
    border-radius: 0 0 var(--radius) 0;
    z-index: 200;
    text-decoration: none;
}
.skip-link:focus { left: 0; }

a { color: var(--color-heading); }

:focus-visible {
    outline: 3px solid rgba(44, 90, 160, .45);
    outline-offset: 2px;
    border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* ============ App shell (sidebar layout) ============ */
.app-shell {
    display: flex;
    align-items: stretch;
    min-height: 100vh;
    min-height: 100dvh;
}
.sidebar {
    width: 268px;
    flex: none;
    background: var(--color-primary-dark);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    align-self: flex-start;
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    z-index: 120;
}
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 20px 18px;
    border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.brand-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex: 1;
    min-width: 0;
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-sm);
    transition: opacity var(--transition);
}
.brand-link:hover { opacity: .85; }
.brand-mark {
    width: 30px;
    height: 30px;
    flex: none;
    color: #fff;
    background: rgba(255, 255, 255, .12);
    border-radius: var(--radius-sm);
    padding: 5px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.brand-text strong { font-size: 1rem; font-weight: 600; }
.brand-text small { font-size: .76rem; color: #A9BEDC; font-weight: 400; }
.sidebar-close {
    display: none;
    margin-left: auto;
    background: transparent;
    border: none;
    color: #fff;
    cursor: pointer;
    width: 36px;
    height: 36px;
    flex: none;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}
.sidebar-close svg { width: 20px; height: 20px; }
.sidebar-close:hover { background: rgba(255, 255, 255, .1); }

.sidebar-context {
    margin: 16px 16px 8px;
    padding: 14px;
    background: rgba(255, 255, 255, .07);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, .1);
}
.sidebar-context-empty p { margin: 0 0 10px; color: #C7D6EC; font-size: .85rem; }
.context-label { font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; color: #93ABD1; margin-bottom: 5px; font-weight: 600; }
.context-school { font-weight: 700; font-size: .95rem; line-height: 1.3; }
.context-period { font-size: .8rem; color: #C7D6EC; margin-top: 2px; }
.context-stats { display: flex; flex-direction: column; gap: 3px; margin-top: 10px; padding-top: 10px; border-top: 1px solid rgba(255, 255, 255, .12); font-size: .8rem; color: #DCE7F5; }
.context-stats strong { color: #fff; }
.context-stats small { color: #9FB4D6; }

.sidebar-nav {
    flex: 1;
    padding: 4px 12px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.nav-section-label {
    font-size: .66rem;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: #8298C2;
    font-weight: 700;
    padding: 16px 10px 6px;
}
.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 11px;
    color: #DCE7F5;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: .88rem;
    font-weight: 500;
    min-height: var(--touch);
    transition: background var(--transition), color var(--transition);
}
.sidebar-nav a svg:first-child { width: 18px; height: 18px; flex: none; }
.sidebar-nav a span { flex: 1; }
.sidebar-nav a:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.sidebar-nav a.active { background: var(--color-primary); color: #fff; }
.sidebar-nav a.locked { color: #7C90B3; }
.sidebar-nav a.locked:hover { background: rgba(255, 255, 255, .05); color: #A9BEDC; }
.sidebar-nav a .lock-icon { width: 14px; height: 14px; flex: none; opacity: .8; }

.sidebar-footer { padding: 12px 18px 18px; border-top: 1px solid rgba(255, 255, 255, .12); }
.sidebar-footer-link {
    display: flex;
    align-items: center;
    gap: 9px;
    color: #B9CBE6;
    text-decoration: none;
    font-size: .85rem;
    font-weight: 500;
    min-height: var(--touch);
}
.sidebar-footer-link svg { width: 16px; height: 16px; }
.sidebar-footer-link:hover { color: #fff; }
.theme-toggle {
    width: 100%;
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    font-family: inherit;
}
.theme-icon-sun { display: none; }
:root[data-theme="dark"] .theme-icon-moon { display: none; }
:root[data-theme="dark"] .theme-icon-sun { display: block; }

.sidebar-backdrop { display: none; }

.main-col { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar-slim {
    display: none;
    align-items: center;
    gap: var(--space-3);
    position: sticky;
    top: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 16px;
    z-index: 90;
}
.sidebar-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    flex: none;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-heading);
    cursor: pointer;
}
.sidebar-toggle svg { width: 20px; height: 20px; }
.topbar-slim-title { font-weight: 600; color: var(--color-heading); font-size: .95rem; }

/* ============ Layout ============ */
.content {
    max-width: 1200px;
    padding: var(--space-5) clamp(16px, 4vw, 32px) var(--space-6);
    width: 100%;
}
h1 {
    font-size: clamp(1.2rem, 1.6vw + 1rem, 1.5rem);
    margin: 0 0 var(--space-4);
    color: var(--color-heading);
    font-weight: 600;
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--color-primary);
    color: #fff;
    border: 1px solid transparent;
    padding: 0 18px;
    min-height: var(--touch);
    border-radius: var(--radius-sm);
    text-decoration: none;
    cursor: pointer;
    font-family: inherit;
    font-size: .92rem;
    font-weight: 600;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn:hover { background: var(--color-primary-dark); }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.btn.small { min-height: 38px; padding: 0 12px; font-size: .82rem; }
.btn.secondary { background: var(--color-primary-tint); color: var(--color-heading); }
.btn.secondary:hover { background: #DEE7F3; }
.btn.danger { background: var(--color-danger-bg); color: var(--color-danger); }
.btn.danger:hover { background: #FAD4D4; }
.btn.block { width: 100%; }

/* Icon-only action links inside tables */
.icon-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
}
.icon-link svg { width: 18px; height: 18px; }
.icon-link:hover { background: var(--color-primary-tint); color: var(--color-heading); }
.icon-link.danger:hover { background: var(--color-danger-bg); color: var(--color-danger); }
.row-actions { display: flex; gap: 4px; justify-content: flex-end; }

/* ============ Cards & sections ============ */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: var(--space-5);
}

/* ============ Tables ============ */
.table-wrap {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-top: var(--space-3);
}
.grid {
    width: 100%;
    border-collapse: collapse;
}
.grid th, .grid td {
    padding: 11px 14px;
    text-align: left;
    font-size: .89rem;
    border-bottom: 1px solid var(--color-border);
}
.grid thead th {
    background: var(--color-primary-dark);
    color: #fff;
    font-weight: 600;
    font-size: .78rem;
    letter-spacing: .03em;
    text-transform: uppercase;
    white-space: nowrap;
}
.grid tbody tr:nth-child(even) { background: var(--color-stripe); }
.grid tbody tr:hover { background: var(--color-primary-tint); }
.grid tbody tr:last-child td { border-bottom: none; }
.grid .total-row { font-weight: 700; background: #EAF0F8 !important; }
.grid .empty-cell { text-align: center; color: var(--color-text-secondary); padding: var(--space-5); }
.enrolment-grid input[type=number] { max-width: 100px; margin-top: 0; }
@media (max-width: 700px) {
    .enrolment-grid input[type=number] { max-width: 120px; }
}

/* Responsive card-stacked tables below 700px */
@media (max-width: 700px) {
    .table-wrap { box-shadow: none; background: transparent; border-radius: 0; overflow: visible; }
    .grid, .grid thead, .grid tbody, .grid th, .grid td, .grid tr { display: block; }
    .grid thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
    .grid tbody tr {
        background: var(--color-surface) !important;
        border: 1px solid var(--color-border);
        border-radius: var(--radius);
        margin-bottom: var(--space-3);
        box-shadow: var(--shadow-sm);
        overflow: hidden;
    }
    .grid td {
        display: flex;
        align-items: center;
        justify-content: flex-end;
        text-align: right;
        gap: var(--space-2);
        padding: 10px 14px;
        min-height: 40px;
        position: relative;
        padding-left: 44%;
    }
    .grid td::before {
        content: attr(data-label);
        position: absolute;
        left: 14px;
        width: 40%;
        text-align: left;
        font-weight: 600;
        color: var(--color-text-secondary);
        font-size: .78rem;
        text-transform: uppercase;
        letter-spacing: .02em;
    }
    .grid td[data-label=""]::before,
    .grid td:not([data-label])::before { content: none; }
    .grid td.no-label { padding-left: 14px; justify-content: flex-end; }
    .row-actions { justify-content: flex-end; }
}

/* ============ Toolbar / search ============ */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
    flex-wrap: wrap;
}
.search-form {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}
.search-field {
    position: relative;
    display: flex;
    align-items: center;
}
.search-field svg {
    position: absolute;
    left: 12px;
    width: 17px;
    height: 17px;
    color: var(--color-text-secondary);
    pointer-events: none;
}
.search-field input {
    padding-left: 38px;
    min-width: 240px;
}

/* ============ Forms ============ */
.form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--space-5);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-4) var(--space-4);
}
.form label, .field-label {
    display: block;
    font-size: .82rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}
.form-grid > label { margin-bottom: 0; }
.form label.required::after { content: " *"; color: var(--color-danger); }

input[type=text], input[type=number], input[type=date], input[type=email], input[type=tel], select, textarea {
    display: block;
    width: 100%;
    margin-top: 6px;
    padding: 0 12px;
    min-height: var(--touch);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: .92rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-surface);
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
select { background-image: linear-gradient(45deg, transparent 50%, var(--color-text-secondary) 50%), linear-gradient(135deg, var(--color-text-secondary) 50%, transparent 50%); background-position: calc(100% - 18px) center, calc(100% - 13px) center; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; appearance: none; padding-right: 32px; }
input:hover, select:hover { border-color: #B9C6D6; }
input:focus, select:focus, textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 90, 160, .18);
    outline: none;
}
.inline-form { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.checkbox-row { display: flex; align-items: center; gap: 10px; min-height: var(--touch); font-weight: 400; color: var(--color-text); }
.checkbox-row input { width: 20px; height: 20px; min-height: 0; margin: 0; accent-color: var(--color-primary); }
.checkbox-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: var(--space-2) var(--space-4); }

fieldset {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin: 0 0 var(--space-4);
    padding: var(--space-4);
}
fieldset:last-of-type { margin-bottom: var(--space-5); }
legend {
    font-weight: 700;
    font-size: .78rem;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--color-heading);
    padding: 0 8px;
}

.form-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding-top: var(--space-2);
}

/* ============ Alerts ============ */
.alert {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: .88rem;
    font-weight: 500;
    margin-bottom: var(--space-4);
}
.alert svg { width: 19px; height: 19px; flex: none; }
.alert.success { color: var(--color-success); background: var(--color-success-bg); }
.alert.error { color: var(--color-danger); background: var(--color-danger-bg); }

/* ============ Dashboard cards (index.php) ============ */
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: var(--space-3); margin-bottom: var(--space-5); }
.stat-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: var(--space-4); box-shadow: var(--shadow-sm); }
.stat-card .stat-value { font-size: 1.6rem; font-weight: 700; color: var(--color-heading); }
.stat-card .stat-label { font-size: .78rem; color: var(--color-text-secondary); text-transform: uppercase; letter-spacing: .03em; margin-top: 2px; }

.empty-state { text-align: center; padding: var(--space-6) var(--space-4); color: var(--color-text-secondary); }
.empty-state svg { width: 44px; height: 44px; color: var(--color-border); margin-bottom: var(--space-3); }

/* ============ Export / Reports page ============ */
.card-title {
    font-weight: 700;
    font-size: .78rem;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--color-heading);
    margin-bottom: var(--space-4);
}
.export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-3);
}
.export-grid .btn { justify-content: flex-start; }
.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-5);
}
.preview-section h3 {
    margin: 0 0 var(--space-2);
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .03em;
    color: var(--color-text-secondary);
}
.preview-section dl { margin: 0; }
.preview-section dt { font-size: .72rem; color: var(--color-text-secondary); margin-top: var(--space-2); }
.preview-section dt:first-child { margin-top: 0; }
.preview-section dd { margin: 2px 0 0; font-size: .9rem; font-weight: 500; }

/* ============ Responsive breakpoints ============ */
@media (max-width: 960px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        height: 100dvh;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 220ms ease;
        box-shadow: var(--shadow-md);
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-close { display: inline-flex; }
    .topbar-slim { display: flex; }
    .sidebar-toggle { display: inline-flex; }
    .sidebar-backdrop.open {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, .45);
        z-index: 110;
    }
    body.sidebar-locked { overflow: hidden; }
}

@media (max-width: 600px) {
    .form-grid, .checkbox-grid { grid-template-columns: 1fr; }
    .toolbar { flex-direction: column; align-items: stretch; }
    .search-form { width: 100%; }
    .search-field input { min-width: 0; width: 100%; }
    .stat-row { grid-template-columns: repeat(2, 1fr); }
}