/* Final UI polish layer. Loaded last so it can improve existing screens without rewriting them. */
:root {
    --ui-primary: #4f46e5;
    --ui-primary-strong: #4338ca;
    --ui-primary-soft: rgba(79, 70, 229, .10);
    --ui-page: #f4f7fb;
    --ui-surface: rgba(255, 255, 255, .94);
    --ui-surface-solid: #ffffff;
    --ui-surface-soft: #f8fafc;
    --ui-border: #e6eaf0;
    --ui-text: #111827;
    --ui-muted: #64748b;
    --ui-shadow-sm: 0 8px 24px rgba(15, 23, 42, .06);
    --ui-shadow-md: 0 16px 38px rgba(15, 23, 42, .09);
    --ui-radius: 16px;
}

html[data-theme="dark"] {
    --ui-page: #0b1120;
    --ui-surface: rgba(15, 23, 42, .94);
    --ui-surface-solid: #111827;
    --ui-surface-soft: #172033;
    --ui-border: #2b3950;
    --ui-text: #f8fafc;
    --ui-muted: #94a3b8;
    --ui-primary-soft: rgba(129, 140, 248, .14);
    --ui-shadow-sm: 0 8px 24px rgba(0, 0, 0, .18);
    --ui-shadow-md: 0 18px 44px rgba(0, 0, 0, .28);
}

html {
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(circle at 92% 4%, rgba(79, 70, 229, .055), transparent 28rem),
        var(--ui-page);
}

html[data-theme="dark"] body {
    background:
        radial-gradient(circle at 92% 4%, rgba(99, 102, 241, .09), transparent 30rem),
        var(--ui-page) !important;
}

/* Sidebar */
.sidebar {
    box-shadow: 12px 0 34px rgba(15, 23, 42, .09);
    border-right: 1px solid rgba(255, 255, 255, .055);
}

.sidebar-brand {
    position: sticky;
    top: 0;
    z-index: 2;
    background: inherit;
    backdrop-filter: blur(14px);
}

.brand-logo {
    box-shadow: 0 10px 22px rgba(79, 70, 229, .32);
    transition: transform .2s ease, box-shadow .2s ease;
}

.sidebar-brand:hover .brand-logo {
    transform: rotate(-4deg) scale(1.04);
    box-shadow: 0 13px 28px rgba(79, 70, 229, .40);
}

.sidebar-nav {
    scrollbar-width: thin;
    scrollbar-color: rgba(148, 163, 184, .26) transparent;
}

.sidebar-link {
    position: relative;
    gap: 11px;
    border: 1px solid transparent;
}

.sidebar-link-icon {
    width: 20px;
    min-width: 20px;
    display: inline-flex;
    justify-content: center;
    font-size: 1rem;
    opacity: .88;
}

.sidebar-link:hover {
    transform: translateX(2px);
    border-color: rgba(255, 255, 255, .055);
}

.sidebar-link.active {
    box-shadow: 0 10px 24px rgba(79, 70, 229, .25);
    border-color: rgba(255, 255, 255, .12);
}

.sidebar-link.active::after {
    content: "";
    position: absolute;
    right: 8px;
    width: 5px;
    height: 5px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .92);
    box-shadow: 0 0 0 4px rgba(255, 255, 255, .10);
}

/* Topbar */
.topbar {
    background: var(--ui-surface) !important;
    border-color: var(--ui-border) !important;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: 0 1px 0 rgba(15, 23, 42, .025), 0 10px 28px rgba(15, 23, 42, .035);
}

html[data-theme="dark"] .topbar {
    background: rgba(15, 23, 42, .90) !important;
}

.topbar-title {
    max-width: min(42vw, 560px);
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.btn-back,
.btn-theme,
.notification-bell,
.btn-mobile-menu {
    border: 1px solid var(--ui-border) !important;
    background: var(--ui-surface-solid) !important;
    color: var(--ui-muted) !important;
    box-shadow: 0 5px 14px rgba(15, 23, 42, .045);
}

.btn-back:hover,
.btn-theme:hover,
.notification-bell:hover,
.btn-mobile-menu:hover {
    color: var(--ui-primary) !important;
    border-color: rgba(79, 70, 229, .30) !important;
    background: var(--ui-primary-soft) !important;
    transform: translateY(-1px);
}

.user-avatar {
    border: 1px solid rgba(79, 70, 229, .14);
    box-shadow: inset 0 0 0 3px rgba(255, 255, 255, .45);
}

html[data-theme="dark"] .user-avatar {
    box-shadow: inset 0 0 0 3px rgba(15, 23, 42, .45);
}

/* Language switcher: a notification-bell-styled toggle button that opens
   a small dropdown menu. One implementation for every screen size, placed
   next to the notification bell, instead of a segmented control that had
   to be hidden below 992px with no equivalent replacement on mobile. */
.lang-dropdown {
    position: relative;
}

.lang-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 170px;
    padding: 6px;
    border: 1px solid var(--ui-border);
    border-radius: 14px;
    background: var(--ui-surface-solid);
    box-shadow: 0 16px 36px rgba(15, 23, 42, .18);
    z-index: 1100;
}

.lang-dropdown.open .lang-dropdown-menu {
    display: block;
}

.lang-dropdown-menu form {
    display: contents;
}

.lang-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 9px 10px;
    border: none;
    border-radius: 9px;
    background: transparent;
    color: var(--ui-text, inherit);
    font-size: 14px;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: .15s ease;
}

.lang-dropdown-item:hover {
    background: var(--ui-primary-soft);
}

.lang-dropdown-item.active {
    background: var(--ui-primary-soft);
    color: var(--ui-primary);
}

.lang-dropdown-item .bi-check-lg {
    margin-left: auto;
}

.lang-dropdown-code {
    display: inline-grid;
    place-items: center;
    min-width: 28px;
    padding: 2px 4px;
    border-radius: 6px;
    background: rgba(148, 163, 184, .16);
    font-size: 11px;
    letter-spacing: .02em;
}

.btn-logout {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    min-height: 40px;
}

/* Main surfaces */
.page-content {
    position: relative;
}

.card,
.form-card,
.analytics-card,
.profile360-kpi {
    border-color: var(--ui-border) !important;
}

.card {
    overflow: hidden;
    background: var(--ui-surface-solid);
    box-shadow: var(--ui-shadow-sm) !important;
}

.card.shadow-sm:hover {
    box-shadow: var(--ui-shadow-md) !important;
}

.card,
.analytics-card,
.stat-card,
.teacher-stat-card,
.quick-action,
.teacher-quick-action {
    transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease, background-color .22s ease;
}

.analytics-card {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--ui-border);
    box-shadow: var(--ui-shadow-sm);
}

.analytics-card::after {
    content: "";
    position: absolute;
    width: 90px;
    height: 90px;
    right: -35px;
    top: -38px;
    border-radius: 999px;
    background: rgba(79, 70, 229, .055);
}

.analytics-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--ui-shadow-md);
    border-color: rgba(79, 70, 229, .18) !important;
}

.analytics-danger::after {
    background: rgba(239, 68, 68, .07);
}

.analytics-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 14px;
    display: grid;
    place-items: center;
}

.analytics-icon-grade {
    background: rgba(245, 158, 11, .13);
    color: #d97706;
}

.analytics-icon-attendance {
    background: rgba(34, 197, 94, .12);
    color: #16a34a;
}

.analytics-icon-absent {
    background: rgba(239, 68, 68, .12);
    color: #dc2626;
}

.analytics-icon-lessons {
    background: rgba(79, 70, 229, .12);
    color: #4f46e5;
}

.dashboard-header {
    padding: 3px 0 1px;
}

.dashboard-date {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    border-color: var(--ui-border) !important;
    box-shadow: 0 6px 18px rgba(15, 23, 42, .04);
}

.section-title-icon {
    display: inline-grid;
    place-items: center;
    width: 30px;
    height: 30px;
    margin-right: 8px;
    border-radius: 9px;
    background: var(--ui-primary-soft);
    color: var(--ui-primary);
}

.performance-item,
.risk-item,
.recent-item,
.notification-item {
    border: 1px solid transparent;
}

.performance-item:hover,
.risk-item:hover,
.recent-item:hover,
.notification-item:hover {
    border-color: rgba(79, 70, 229, .16) !important;
    box-shadow: 0 8px 20px rgba(15, 23, 42, .055);
}

.performance-rank {
    min-width: 38px;
    width: 38px;
    height: 34px;
    display: inline-grid;
    place-items: center;
    border-radius: 10px;
    background: var(--ui-primary-soft);
}

.recent-avatar {
    box-shadow: inset 0 0 0 1px rgba(79, 70, 229, .10);
}

/* Tables */
.table-responsive {
    border-radius: 13px;
}

.table thead th {
    background: var(--ui-surface-soft);
    color: var(--ui-muted) !important;
    border-color: var(--ui-border) !important;
    font-weight: 700;
    white-space: nowrap;
}

.table tbody td {
    border-color: var(--ui-border) !important;
}

.table-hover tbody tr,
.dashboard-table tbody tr {
    transition: background-color .16s ease, transform .16s ease;
}

.table-hover tbody tr:hover,
.dashboard-table tbody tr:hover {
    background: var(--ui-primary-soft) !important;
}

/* Forms and buttons */
.form-control,
.form-select,
.input-group-text {
    border-color: var(--ui-border) !important;
    background-color: var(--ui-surface-solid);
    color: var(--ui-text);
    transition: border-color .18s ease, box-shadow .18s ease, background-color .18s ease;
}

.form-control:hover,
.form-select:hover {
    border-color: #b8c0cf !important;
}

.form-control:focus,
.form-select:focus {
    border-color: #6366f1 !important;
    box-shadow: 0 0 0 .23rem rgba(99, 102, 241, .12) !important;
}

html[data-theme="dark"] .form-control,
html[data-theme="dark"] .form-select,
html[data-theme="dark"] .input-group-text {
    background: #0f172a !important;
    color: #e5e7eb !important;
}

html[data-theme="dark"] .form-control:hover,
html[data-theme="dark"] .form-select:hover {
    border-color: #475569 !important;
}

.btn {
    box-shadow: none;
    transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease, border-color .16s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-primary {
    box-shadow: 0 7px 16px rgba(79, 70, 229, .18);
}

.btn-primary:hover {
    box-shadow: 0 10px 22px rgba(79, 70, 229, .24);
}

.btn:focus-visible,
.sidebar-link:focus-visible,
.performance-item:focus-visible,
.risk-item:focus-visible,
.recent-item:focus-visible,
.notification-bell:focus-visible,
.btn-back:focus-visible,
.btn-theme:focus-visible,
.btn-mobile-menu:focus-visible {
    outline: 3px solid rgba(99, 102, 241, .28) !important;
    outline-offset: 2px;
}

.alert {
    border: 1px solid transparent !important;
    box-shadow: var(--ui-shadow-sm) !important;
}

/* Scrollbars */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(100, 116, 139, .38) transparent;
}

*::-webkit-scrollbar {
    width: 9px;
    height: 9px;
}

*::-webkit-scrollbar-thumb {
    background: rgba(100, 116, 139, .34);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

*::-webkit-scrollbar-thumb:hover {
    background: rgba(79, 70, 229, .44);
    border: 2px solid transparent;
    background-clip: padding-box;
}

/* Mobile navigation */
.btn-mobile-menu {
    width: 38px;
    height: 38px;
    display: none;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 0;
    border-radius: 10px;
    font-size: 17px;
    cursor: pointer;
    transition: .2s ease;
}

.sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 950;
    display: none;
    border: 0;
    padding: 0;
    background: rgba(2, 6, 23, .58);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

@media (max-width: 992px) {
    .topbar-user {
        gap: 10px;
    }

    .lang-dropdown-menu {
        right: -8px;
    }

    .btn-logout span {
        display: none;
    }

    .btn-logout {
        width: 40px;
        height: 40px;
        min-height: 40px;
        padding: 0;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    body.sidebar-open {
        overflow: hidden;
    }

    .sidebar {
        display: flex !important;
        width: min(86vw, 292px) !important;
        transform: translateX(-105%);
        transition: transform .25s cubic-bezier(.22, 1, .36, 1);
        box-shadow: 20px 0 48px rgba(2, 6, 23, .30);
        z-index: 1000;
    }

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

    body.sidebar-open .sidebar-backdrop {
        display: block;
    }

    .btn-mobile-menu {
        display: inline-flex;
    }

    .topbar {
        height: 68px;
        padding: 0 14px !important;
    }

    .topbar-title-group {
        gap: 8px;
        min-width: 0;
    }

    .topbar-title {
        max-width: 34vw;
        font-size: .95rem;
    }

    .page-content {
        padding: 18px 14px 24px !important;
    }

    .dashboard-header {
        align-items: flex-start;
        gap: 14px;
        flex-direction: column;
    }

    .dashboard-date {
        width: 100%;
        justify-content: center;
    }

    .card-body {
        padding: 19px;
    }
}

@media (max-width: 540px) {
    .topbar-user {
        gap: 7px;
    }

    .notification-bell,
    .btn-theme,
    .btn-back,
    .btn-mobile-menu,
    .btn-logout {
        width: 36px;
        height: 36px;
        min-height: 36px;
    }

    .topbar-title {
        display: none;
    }

    .analytics-card {
        padding: 1rem;
    }

    .analytics-card strong {
        font-size: 1.45rem;
    }

    .analytics-icon {
        width: 44px;
        height: 44px;
        min-width: 44px;
    }

    .section-header {
        align-items: flex-start;
        gap: 10px;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}