/* ==========================================================================
   OAP theme — clean institutional SaaS
   Loaded AFTER main.css (and after DataTables CSS) so these rules win.
   Phase 1: design tokens + shared shell (header, sidebar, base components)
   ========================================================================== */

:root {
    --oap-primary: #2563EB;
    --oap-primary-dark: #1D4ED8;
    --oap-primary-soft: #EEF4FF;
    --oap-navy: #0F172A;
    --oap-text: #1E293B;
    --oap-muted: #64748B;
    --oap-border: #E2E8F0;
    --oap-bg: #F5F7FB;
    --oap-surface: #FFFFFF;
    --oap-radius: 10px;
    --oap-radius-sm: 8px;
    --oap-shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
    --oap-shadow-md: 0 4px 16px rgba(15, 23, 42, .08);
    --oap-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* ---------- Base -------------------------------------------------------- */
html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--oap-font);
    font-size: 14.5px;
    color: var(--oap-text);
    background-color: var(--oap-bg);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--oap-navy);
    letter-spacing: -0.01em;
}

a {
    color: var(--oap-primary);
    transition: color .15s ease;
}

a:hover, a:focus {
    color: var(--oap-primary-dark);
}

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #94A3B8; }

/* ---------- Top header -------------------------------------------------- */
.app-header {
    background-color: var(--oap-surface);
    border-bottom: 1px solid var(--oap-border);
    box-shadow: var(--oap-shadow-sm);
}

.app-header__logo {
    color: var(--oap-navy);
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.02em;
    align-self: center;
    background-color: var(--oap-surface); /* overrides the template's teal block (min-width:768) */
    border-right: 1px solid var(--oap-border);
    font-family: var(--oap-font);
    line-height: 50px;
}

.app-header__logo:hover, .app-header__logo:focus {
    color: var(--oap-navy);
    text-decoration: none;
}

/* Institute name + academic year (the old template centers white text) */
.app-header h2 {
    color: var(--oap-muted) !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    letter-spacing: .01em;
    align-self: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 60%;
}

.app-header h2 span {
    color: var(--oap-primary);
    font-weight: 700;
    margin-left: 6px;
}

/* Hamburger */
.app-sidebar__toggle { color: var(--oap-muted); }
.app-sidebar__toggle::before { color: var(--oap-muted); }
.app-sidebar__toggle:hover, .app-sidebar__toggle:focus {
    /* main.css legacy rule uses the old dark-green #00635a hover block and
       keeps it stuck on :focus - neutralize it for the light header. */
    color: var(--oap-primary);
    background-color: var(--oap-primary-soft);
    text-decoration: none;
}
.app-sidebar__toggle:hover::before, .app-sidebar__toggle:focus::before { color: var(--oap-primary); }

/* Right-hand nav icons */
.app-nav__item {
    color: var(--oap-muted);
    width: 44px;
    text-align: center;
    transition: background-color .15s ease, color .15s ease;
}

.app-nav__item:hover, .app-nav__item:focus {
    background-color: var(--oap-primary-soft);
    color: var(--oap-primary);
    text-decoration: none;
}

.dropdown-menu.settings-menu {
    border: 1px solid var(--oap-border);
    border-radius: var(--oap-radius-sm);
    box-shadow: var(--oap-shadow-md);
    padding: 6px;
    margin-top: 8px;
}

.dropdown-menu.settings-menu .dropdown-item {
    border-radius: 6px;
    padding: 8px 14px;
    font-size: 14px;
    color: var(--oap-text);
}

.dropdown-menu.settings-menu .dropdown-item:hover {
    background-color: var(--oap-primary-soft);
    color: var(--oap-primary-dark);
}

/* ---------- Sidebar ----------------------------------------------------- */
.app-sidebar {
    background-color: var(--oap-surface);
    border-right: 1px solid var(--oap-border);
    box-shadow: none;
}

.app-sidebar__overlay { background: rgba(15, 23, 42, .35); }

/* User block */
.app-sidebar .text-center.pb-1 {
    border-bottom: 1px solid var(--oap-border);
    margin-bottom: 10px;
    padding-top: 6px;
}

.app-sidebar__user-name {
    color: var(--oap-navy);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.app-sidebar__user-designation {
    display: inline-block;
    background-color: var(--oap-primary-soft);
    color: var(--oap-primary-dark);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .04em;
    text-transform: uppercase;
    padding: 3px 10px;
    border-radius: 999px;
    margin-bottom: 4px;
}

/* Menu items */
.app-menu__item {
    color: #334155;
    font-size: 14px;
    font-weight: 500;
    padding: 11px 14px;
    margin: 2px 10px;
    border-left: 0;
    border-radius: var(--oap-radius-sm);
    transition: background-color .15s ease, color .15s ease;
}

.app-menu__item:hover, .app-menu__item:focus {
    background-color: #F1F5F9;
    color: var(--oap-navy);
    text-decoration: none;
}

.app-menu__item .app-menu__icon {
    color: #94A3B8;
    font-size: 16px;
    width: 20px;
    text-align: center;
    transition: color .15s ease;
}

.app-menu__item:hover .app-menu__icon { color: var(--oap-muted); }

/* Active item: soft indigo pill instead of the old cyan left-border */
.app-menu__item.active,
li.active > .app-menu__item {
    background-color: var(--oap-primary-soft) !important;
    color: var(--oap-primary-dark) !important;
    font-weight: 600;
    border-left-color: transparent !important;
}

.app-menu__item.active .app-menu__icon,
li.active > .app-menu__item .app-menu__icon {
    color: var(--oap-primary) !important;
}

.treeview-indicator { color: #94A3B8; font-weight: 600; }
.treeview.is-expanded > .app-menu__item .treeview-indicator { transform: rotate(90deg); }

/* Submenu */
.treeview-menu {
    background: transparent !important;
    padding: 2px 0 4px;
}

.treeview.is-expanded > .treeview-menu { max-height: 600px; }

.treeview-menu .treeview-item {
    color: var(--oap-muted);
    font-size: 13.5px;
    padding: 9px 14px 9px 48px;
    border-radius: var(--oap-radius-sm);
    margin: 1px 10px;
    transition: background-color .15s ease, color .15s ease;
}

.treeview-menu .treeview-item:hover {
    background-color: #F1F5F9;
    color: var(--oap-navy);
    text-decoration: none;
}

.treeview-menu .treeview-item .icon { color: #CBD5E1; font-size: 7px; vertical-align: middle; }

.treeview-menu li.active > .treeview-item,
.treeview-menu .treeview-item.active {
    color: var(--oap-primary-dark);
    font-weight: 600;
    background-color: var(--oap-primary-soft);
}

.treeview-menu li.active > .treeview-item .icon,
.treeview-menu .treeview-item.active .icon { color: var(--oap-primary); }

/* ---------- Page content ------------------------------------------------ */
.app-content { background-color: var(--oap-bg); }

.app-title h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--oap-navy);
}

.app-breadcrumb { background: transparent; }
.app-breadcrumb .breadcrumb-item a { color: var(--oap-muted); }
.app-breadcrumb .breadcrumb-item.active { color: var(--oap-primary); font-weight: 500; }

/* ---------- Cards ("tile") --------------------------------------------- */
.tile {
    background-color: var(--oap-surface);
    border: 1px solid var(--oap-border);
    border-radius: var(--oap-radius);
    box-shadow: var(--oap-shadow-sm);
    margin-bottom: 24px;
    overflow: hidden;
}

.tile .tile-title {
    color: var(--oap-navy);
    font-size: 15px;
    font-weight: 600;
    border-bottom: 1px solid var(--oap-border);
    background-color: #FCFDFE;
}

.tile .tile-title-w-btn { border-bottom: 1px solid var(--oap-border); }
.tile .tile-title-w-btn p,
.tile .tile-title-w-btn .title { color: var(--oap-navy); font-weight: 600; font-size: 15px; }

.tile .tile-body { padding: 20px; }

/* ---------- Buttons ----------------------------------------------------- */
.btn {
    font-family: var(--oap-font);
    font-weight: 600;
    font-size: 14px;
    border-radius: var(--oap-radius-sm);
    padding: 9px 18px;
    transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.btn-primary {
    background-color: var(--oap-primary);
    border-color: var(--oap-primary);
    box-shadow: var(--oap-shadow-sm);
}

.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background-color: var(--oap-primary-dark);
    border-color: var(--oap-primary-dark);
    box-shadow: var(--oap-shadow-md);
}

.btn-outline-secondary { border-color: var(--oap-border); color: var(--oap-muted); }
.btn-outline-secondary:hover { background-color: #F1F5F9; border-color: #CBD5E1; color: var(--oap-navy); }
.btn-danger { border-radius: var(--oap-radius-sm); }

/* ---------- Forms ------------------------------------------------------- */
label {
    color: #334155;
    font-weight: 600;
    font-size: 13.5px;
    margin-bottom: 6px;
}

.form-control {
    border: 1px solid var(--oap-border);
    border-radius: var(--oap-radius-sm);
    padding: 10px 12px;
    font-size: 14px;
    color: var(--oap-text);
    background-color: #FFFFFF;
    transition: border-color .15s ease, box-shadow .15s ease;
}

.form-control:focus {
    border-color: var(--oap-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
    color: var(--oap-text);
}

.form-control::placeholder { color: #94A3B8; }

select.form-control { height: auto; }

.error, p.error, .text-danger { color: #DC2626; font-size: 13px; }

/* ---------- Tables ------------------------------------------------------ */
.table { color: var(--oap-text); }

.table thead th {
    font-size: 11.5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--oap-muted);
    border-bottom: 1px solid var(--oap-border);
    background-color: #F8FAFC;
    padding: 12px;
    white-space: nowrap;
}

.table td {
    font-size: 14px;
    color: var(--oap-text);
    vertical-align: middle;
    border-top: 1px solid var(--oap-border);
    padding: 11px 12px;
}

.table-hover tbody tr:hover { background-color: #F8FAFC; }

/* Row status colours used by the pages' JS (kept, just softened) */
tr.success td, td.success { background-color: rgba(34, 197, 94, .12) !important; }
tr.confirm td, td.confirm { background-color: rgba(37, 99, 235, .10) !important; }
tr.fail td, td.fail { background-color: rgba(239, 68, 68, .12) !important; }

/* ---------- DataTables -------------------------------------------------- */
div.dataTables_wrapper .dataTables_length,
div.dataTables_wrapper .dataTables_filter {
    color: var(--oap-muted);
    font-size: 13.5px;
    margin-bottom: 14px;
}

div.dataTables_wrapper .dataTables_filter input {
    border: 1px solid var(--oap-border);
    border-radius: var(--oap-radius-sm);
    padding: 8px 12px;
    font-size: 14px;
    color: var(--oap-text);
    outline: none;
    transition: border-color .15s ease, box-shadow .15s ease;
}

div.dataTables_wrapper .dataTables_filter input:focus {
    border-color: var(--oap-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

div.dataTables_wrapper .dataTables_info {
    color: var(--oap-muted);
    font-size: 13px;
    padding-top: 10px;
}

div.dataTables_wrapper .dataTables_paginate .paginate_button {
    color: var(--oap-muted) !important;
    border: 1px solid var(--oap-border);
    border-radius: 6px;
    margin: 0 2px;
    padding: 5px 11px;
    font-size: 13.5px;
    transition: background-color .15s ease, border-color .15s ease;
}

div.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
    background-color: var(--oap-primary-soft) !important;
    border-color: var(--oap-primary) !important;
    color: var(--oap-primary-dark) !important;
}

div.dataTables_wrapper .dataTables_paginate .paginate_button.current,
div.dataTables_wrapper .dataTables_paginate .paginate_button.current:hover {
    background-color: var(--oap-primary) !important;
    border-color: var(--oap-primary) !important;
    color: #FFFFFF !important;
    font-weight: 600;
    box-shadow: var(--oap-shadow-sm);
}

div.dataTables_wrapper .dataTables_paginate .paginate_button.disabled,
div.dataTables_wrapper .dataTables_paginate .paginate_button.disabled:hover {
    background: transparent !important;
    border-color: transparent !important;
    /* #94A3B8 keeps "disabled" clearly muted but readable on white
       (the previous #CBD5E1 was nearly invisible). */
    color: #94A3B8 !important;
}

/* Export / print buttons */
div.dataTables_wrapper .dt-button,
div.dataTables_wrapper .buttons-html5,
div.dataTables_wrapper .buttons-print {
    background-color: #FFFFFF !important;
    border: 1px solid var(--oap-border) !important;
    border-radius: var(--oap-radius-sm) !important;
    color: var(--oap-text) !important;
    font-weight: 600 !important;
    font-size: 13px !important;
    padding: 7px 14px !important;
    box-shadow: var(--oap-shadow-sm);
    transition: background-color .15s ease, border-color .15s ease;
}

div.dataTables_wrapper .dt-button:hover,
div.dataTables_wrapper .buttons-html5:hover,
div.dataTables_wrapper .buttons-print:hover {
    background-color: var(--oap-primary-soft) !important;
    border-color: var(--oap-primary) !important;
    color: var(--oap-primary-dark) !important;
}

/* Column filter selects in table footers */
table.dataTable tfoot select {
    border: 1px solid var(--oap-border);
    border-radius: 6px;
    padding: 4px 6px;
    font-size: 13px;
    color: var(--oap-text);
    background-color: #FFFFFF;
}

/* ---------- Alerts (flash messages) ------------------------------------- */
.alert {
    border: 0;
    border-radius: var(--oap-radius-sm);
    font-size: 14px;
    padding: 12px 16px;
    box-shadow: var(--oap-shadow-sm);
}

.alert-success { background-color: #ECFDF5; color: #065F46; }
.alert-danger  { background-color: #FEF2F2; color: #991B1B; }
.alert-warning { background-color: #FFFBEB; color: #92400E; }
.alert-info    { background-color: var(--oap-primary-soft); color: var(--oap-primary-dark); }

/* ---------- Modals ------------------------------------------------------ */
.modal-content {
    border: 0;
    border-radius: 14px;
    box-shadow: var(--oap-shadow-md);
    overflow: hidden;
}

.modal-header {
    border-bottom: 1px solid var(--oap-border);
    background-color: #FCFDFE;
    padding: 18px 22px;
}

.modal-header h4 { font-weight: 700; font-size: 17px; color: var(--oap-navy); }

.modal-body { padding: 22px; }
.modal-footer { border-top: 1px solid var(--oap-border); padding: 16px 22px; }

/* ---------- Dashboard stat cards (phase 3) ------------------------------ */
.oap-stat-card {
    display: flex;
    gap: 16px;
    align-items: center;
    background-color: var(--oap-surface);
    border: 1px solid var(--oap-border);
    border-radius: var(--oap-radius);
    box-shadow: var(--oap-shadow-sm);
    padding: 20px;
    margin-bottom: 24px;
    transition: box-shadow .15s ease, transform .15s ease;
}

.oap-stat-card:hover {
    box-shadow: var(--oap-shadow-md);
    transform: translateY(-2px);
}

.oap-stat-icon {
    flex: 0 0 auto;
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--oap-primary-soft);
    color: var(--oap-primary);
    font-size: 22px;
}

.oap-stat-icon.teal   { background-color: #ECFDF5; color: #0D9488; }
.oap-stat-icon.amber  { background-color: #FFFBEB; color: #D97706; }
.oap-stat-icon.violet { background-color: #F5F3FF; color: #7C3AED; }

.oap-stat-body { min-width: 0; flex: 1; }

.oap-stat-label {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--oap-muted);
    margin: 0 0 4px;
}

.oap-stat-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--oap-navy);
    margin: 0;
    line-height: 1.2;
}

.oap-stat-value span {
    font-size: 16px;
    font-weight: 600;
    color: var(--oap-muted);
    margin-left: 2px;
}

.oap-stat-bar {
    height: 5px;
    border-radius: 999px;
    background-color: #E2E8F0;
    overflow: hidden;
    margin: 8px 0 4px;
}

.oap-stat-bar > span {
    display: block;
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, #2563EB, #3B82F6);
}

.oap-stat-caption {
    font-size: 12px;
    color: var(--oap-muted);
    margin: 0;
}

.tile .title-lg {
    color: var(--oap-navy);
    font-weight: 600;
    font-size: 15px;
    margin: 0;
    padding: 14px 20px;
}

/* ---------- Compact density (phase 4) ----------------------------------- */
.tile .tile-body { padding: 16px; }
.tile { margin-bottom: 18px; }
.tile-body form.row .form-group { margin-bottom: 12px; }
.tile-body label { margin-bottom: 4px; }
.tile .tile-title { padding: 10px 16px; }
.tile .tile-title-w-btn { padding: 10px 16px; }
.form-control { padding: 8px 11px; }
.table thead th { padding: 9px 10px; }
.table td { padding: 8px 10px; }
.modal-body { padding: 18px; }
.modal-header { padding: 14px 18px; }

/* ---------- Status colour legend (students filters) --------------------- */
.oap-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 22px;
    align-items: center;
}

.oap-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
    color: var(--oap-text);
    white-space: nowrap;
}

.oap-legend-swatch {
    width: 14px;
    height: 14px;
    border-radius: 4px;
    flex: 0 0 auto;
    box-shadow: inset 0 0 0 1px rgba(15, 23, 42, .10);
}

/* ---------- Auth pages (login / OTP) — wired in phase 2 ----------------- */
.material-half-bg .cover {
    background: linear-gradient(135deg, #1E3A8A 0%, #2563EB 55%, #3B82F6 100%);
    opacity: 1;
}

.login-content .logo h2 { color: var(--oap-navy); font-weight: 700; font-size: 22px; }
.login-content .logo h3 { color: var(--oap-muted); font-weight: 500; font-size: 15px; }

.login-box {
    background: var(--oap-surface);
    border: 1px solid var(--oap-border);
    border-radius: 16px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, .18);
    padding: 8px;
}

.login-form { padding: 26px 28px; }
.login-form .login-head { margin-bottom: 14px; text-align: center; }

.login-form label.control-label {
    color: var(--oap-muted);
    font-size: 13.5px;
    font-weight: 500;
    line-height: 1.5;
}

.login-form input.form-control {
    border: 1px solid var(--oap-border);
    border-radius: var(--oap-radius-sm);
    padding: 12px 14px;
    font-size: 15px;
}

.login-form input.form-control:focus {
    border-color: var(--oap-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.login-form .btn-primary {
    padding: 12px 18px;
    font-size: 15px;
    letter-spacing: .01em;
}

.login-form .btn-danger { padding: 12px 18px; font-size: 15px; }