/* ==========================================================================
   i-LinkCST — Mobile-first portal UI (student & teacher)
   Brand blue: #00C9FC · Accent yellow: #F9DB0F · Page bg: #B2FBFF
   ========================================================================== */

body.app-portal {
    --brand-blue: #00C9FC;
    --brand-blue-600: #00A3CA;
    --brand-blue-700: #0088AB;
    --brand-blue-deep: #006D88;
    --brand-blue-50: #E6FAFE;
    --brand-yellow: #F9DB0F;
    --brand-yellow-soft: #fffce8;
    --page-bg: #d8f7fc;
    --page-bg-deep: #b8eef8;
    --text: #17325c;
    --text-muted: #4d6589;
    --surface: #ffffff;
    --surface-muted: #F3FBFD;
    --border: #c5e8f0;
    --border-strong: #8fd6e8;
    --radius-sm: 10px;
    --radius: 14px;
    --radius-lg: 18px;
    --shadow-sm: 0 1px 2px rgba(23, 50, 92, 0.04), 0 4px 14px rgba(0, 163, 202, 0.08);
    --shadow: 0 4px 10px rgba(23, 50, 92, 0.05), 0 14px 36px rgba(0, 163, 202, 0.12);
    --shadow-lg: 0 10px 40px rgba(23, 50, 92, 0.1), 0 2px 8px rgba(0, 201, 252, 0.08);
    --page-gutter: clamp(0.875rem, 3.5vw, 1.5rem);
    --app-nav-height: 64px;
    --app-touch-min: 48px;
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Reset global "transition: all" inside portal for smoother, scoped motion */
@media (prefers-reduced-motion: no-preference) {
    body.app-portal *,
    body.app-portal *::before,
    body.app-portal *::after {
        transition-property: none;
        transition-duration: 0s;
    }

    body.app-portal a,
    body.app-portal .btn,
    body.app-portal .nav-link,
    body.app-portal .app-nav-btn,
    body.app-portal .student-nav-btn,
    body.app-portal .card.panel-card,
    body.app-portal .navbar-collapse,
    body.app-portal .form-control,
    body.app-portal .form-select {
        transition-property: color, background-color, border-color, box-shadow, transform, opacity;
        transition-duration: 0.2s;
        transition-timing-function: var(--ease-out);
    }
}

/* ---- Top navbar ---- */
body.app-portal {
    background:
        radial-gradient(ellipse 90% 55% at 8% -10%, rgba(0, 201, 252, 0.22), transparent 55%),
        radial-gradient(ellipse 70% 45% at 92% 0%, rgba(249, 219, 15, 0.14), transparent 50%),
        linear-gradient(180deg, var(--page-bg) 0%, var(--page-bg-deep) 48%, #c5eef8 100%) !important;
    background-attachment: fixed;
}

body.app-portal .nav-modern,
body.app-portal .nav-modern-app {
    background: rgba(255, 255, 255, 0.88) !important;
    -webkit-backdrop-filter: blur(14px) saturate(1.15);
    backdrop-filter: blur(14px) saturate(1.15);
}

body.app-portal .nav-modern-app {
    margin-bottom: 0 !important;
    padding-top: max(0.35rem, env(safe-area-inset-top));
    padding-bottom: 0.35rem;
    border-bottom: 1px solid rgba(197, 232, 240, 0.85) !important;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, var(--shadow-sm) !important;
}

body.app-portal .nav-modern-app .app-nav-container {
    padding-left: var(--page-gutter);
    padding-right: var(--page-gutter);
    gap: 0.5rem;
}

body.app-portal .nav-modern-app .navbar-brand {
    font-size: clamp(0.95rem, 3.5vw, 1.1rem);
    max-width: min(100%, 280px);
}

body.app-portal .nav-modern-app .brand-logo {
    max-height: 28px;
}

@media (min-width: 576px) {
    body.app-portal .nav-modern-app .brand-logo {
        max-height: 32px;
    }
}

body.app-portal .nav-modern-app .navbar-collapse {
    padding-top: 0.5rem;
}

@media (min-width: 992px) {
    body.app-portal .nav-modern-app .navbar-collapse {
        padding-top: 0;
    }
}

body.app-portal .nav-modern-app .nav-link {
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.75rem !important;
    min-height: var(--app-touch-min);
    display: flex;
    align-items: center;
}

/* Top navbar: yellow highlight on hover, focus, and click */
body.app-portal .nav-modern .nav-link,
body.app-portal .nav-modern-app .nav-link {
    transition: background-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

body.app-portal .nav-modern .nav-link:hover,
body.app-portal .nav-modern .nav-link:focus,
body.app-portal .nav-modern-app .nav-link:hover,
body.app-portal .nav-modern-app .nav-link:focus,
body.app-portal .nav-modern .nav-link.active,
body.app-portal .nav-modern-app .nav-link.active,
body.app-portal .nav-modern .nav-link[aria-current="page"],
body.app-portal .nav-modern-app .nav-link[aria-current="page"] {
    background: var(--brand-yellow-soft) !important;
    color: var(--text) !important;
    box-shadow: inset 0 0 0 2px var(--brand-yellow);
}

body.app-portal .nav-modern .nav-link:active,
body.app-portal .nav-modern-app .nav-link:active {
    background: var(--brand-yellow) !important;
    color: var(--text) !important;
    box-shadow: inset 0 0 0 2px #d4bc0c;
}

body.app-portal .nav-modern .navbar-brand,
body.app-portal .nav-modern-app .navbar-brand,
body.app-portal .nav-modern .nav-link,
body.app-portal .nav-modern-app .nav-link {
    color: var(--brand-blue-600) !important;
}

body.app-portal .nav-modern-app .user-chip {
    max-width: 100%;
    font-size: 0.8125rem;
}

@media (max-width: 991.98px) {
    body.app-portal .nav-modern-app .navbar-nav.ms-auto {
        padding-top: 0.5rem;
        border-top: 1px solid var(--border);
        margin-top: 0.5rem;
    }

    body.app-portal .nav-modern-app .user-chip {
        width: 100%;
        justify-content: flex-start;
        margin-bottom: 0.35rem;
    }

    body.app-portal .nav-modern-app .nav-item .btn-outline-light {
        width: 100%;
        min-height: var(--app-touch-min);
        border-color: var(--brand-blue) !important;
        color: var(--brand-blue-600) !important;
    }
}

/* ---- Page shell & spacing ---- */
body.app-portal .app-workspace,
body.app-portal .student-shell.container-fluid,
body.app-portal .teacher-shell.container-fluid,
body.app-portal .admin-shell.container-fluid {
    padding-left: var(--page-gutter) !important;
    padding-right: var(--page-gutter) !important;
    padding-top: 1rem !important;
    padding-bottom: max(1.75rem, env(safe-area-inset-bottom)) !important;
    max-width: 1600px;
    margin-left: auto;
    margin-right: auto;
}

body.app-portal .app-shell-row {
    --bs-gutter-x: 1rem;
    min-height: auto !important;
    max-height: none !important;
    overflow: visible !important;
    display: flex !important;
    flex-wrap: wrap;
}

body.app-portal .student-main-col,
body.app-portal .teacher-main-col {
    min-height: auto !important;
    max-height: none !important;
    overflow: visible !important;
    padding-right: 0 !important;
}

body.app-portal .student-sidebar-col,
body.app-portal .teacher-sidebar-col {
    position: sticky;
    top: calc(var(--app-nav-height) + 0.25rem);
    z-index: 1020;
    align-self: flex-start;
    height: auto !important;
    max-height: none !important;
}

@media (min-width: 992px) {
    body.app-portal .student-sidebar-col,
    body.app-portal .teacher-sidebar-col {
        top: calc(var(--app-nav-height) + 0.5rem);
    }

    body.app-portal .student-main-col,
    body.app-portal .teacher-main-col {
        padding-left: 0.75rem;
    }
}

/* Content enter animation */
@keyframes appContentIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

body.app-portal .app-main-panel.app-content-ready {
    animation: appContentIn 0.4s var(--ease-out) both;
}

/* ---- Page header & breadcrumbs ---- */
.app-page-header {
    margin-bottom: 1.35rem;
}

.app-page-header .section-title {
    font-size: clamp(1.4rem, 4vw, 1.85rem);
    margin-bottom: 0.4rem !important;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.app-page-header .section-subtitle,
.app-page-header .app-page-lead {
    font-size: 0.95rem;
    line-height: 1.5;
    max-width: 42rem;
    color: var(--text-muted) !important;
}

.app-breadcrumb {
    margin-bottom: 0.75rem;
}

.app-breadcrumb .breadcrumb {
    font-size: 0.8125rem;
    padding: 0;
    margin: 0;
    background: transparent;
    flex-wrap: wrap;
    gap: 0.15rem;
}

.app-breadcrumb .breadcrumb-item a {
    color: var(--brand-blue-600) !important;
    text-decoration: none;
    font-weight: 500;
}

.app-breadcrumb .breadcrumb-item a:hover {
    color: var(--brand-blue-deep) !important;
    text-decoration: underline;
}

.app-breadcrumb .breadcrumb-item.active {
    color: var(--text-muted) !important;
    font-weight: 600;
}

.app-breadcrumb .breadcrumb-item + .breadcrumb-item::before {
    color: var(--border-strong);
}

/* ---- Sidebar navigation ---- */
.app-sidebar-nav.card {
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-sm) !important;
    background: rgba(255, 255, 255, 0.92) !important;
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

.app-sidebar-nav .app-nav-heading {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted) !important;
    margin-bottom: 0.65rem;
}

.app-sidebar-nav .app-nav-btn,
.app-sidebar-nav .student-nav-btn,
.app-sidebar-nav .btn.student-nav-btn {
    min-height: var(--app-touch-min);
    padding: 0.55rem 0.9rem;
    font-size: 0.9375rem;
    font-weight: 600;
    text-align: left;
    border-radius: var(--radius-sm) !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.app-sidebar-nav .app-nav-btn.btn-primary,
.app-sidebar-nav .student-nav-btn.btn-primary {
    background: linear-gradient(180deg, #7ee3ff, var(--brand-blue)) !important;
    border-color: var(--brand-blue-600) !important;
    color: #17325c !important;
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.45) inset,
        0 4px 14px rgba(0, 201, 252, 0.28);
}

.app-sidebar-nav .app-nav-btn.btn-outline-primary,
.app-sidebar-nav .student-nav-btn.btn-outline-primary {
    background: rgba(255, 255, 255, 0.75) !important;
    border-color: var(--border-strong) !important;
}

.app-sidebar-nav .app-nav-btn.btn-outline-primary:hover,
.app-sidebar-nav .student-nav-btn.btn-outline-primary:hover {
    background: var(--brand-blue-50) !important;
    border-color: var(--brand-blue) !important;
    color: var(--brand-blue-deep) !important;
}

.app-sidebar-nav .app-nav-hint {
    font-size: 0.8125rem;
    line-height: 1.45;
    color: var(--text-muted) !important;
    margin: 0.75rem 0 0;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

/* Horizontal scroll menu wrapper (mobile) */
.app-nav-scroll-wrap {
    position: relative;
}

.app-nav-scroll-wrap::before,
.app-nav-scroll-wrap::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0.25rem;
    width: 1.25rem;
    pointer-events: none;
    z-index: 2;
    opacity: 0;
    transition: opacity 0.2s var(--ease-out);
}

.app-nav-scroll-wrap.is-scrollable::before {
    left: 0;
    opacity: 1;
    background: linear-gradient(90deg, var(--surface) 0%, transparent 100%);
}

.app-nav-scroll-wrap.is-scrollable.is-at-end::after {
    opacity: 0;
}

.app-nav-scroll-wrap.is-scrollable:not(.is-at-end)::after {
    right: 0;
    opacity: 1;
    background: linear-gradient(270deg, var(--surface) 0%, transparent 100%);
}

/* ---- Main content cards ---- */
.app-main-panel > .card,
.app-main-panel > .panel-card,
.student-main-col > .card.panel-card,
.teacher-main-col > .card.panel-card {
    border: 1px solid var(--border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow) !important;
    background: var(--surface) !important;
    margin-bottom: 1.15rem;
    overflow: hidden;
}

.app-main-panel .card-body > h5:first-child,
.app-main-panel .card-body > .section-title:first-child {
    margin-bottom: 1rem;
    padding-bottom: 0.65rem;
    border-bottom: 2px solid var(--brand-yellow);
    color: var(--text) !important;
    font-weight: 700;
}

/* Back row */
.app-back-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.app-back-row .section-title {
    flex: 1 1 auto;
    min-width: 0;
}

.app-back-row .btn {
    min-height: var(--app-touch-min);
    font-weight: 600;
    flex-shrink: 0;
    border-radius: var(--radius-sm) !important;
}

/* Tables & forms on small screens */
body.app-portal .table-responsive {
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    -webkit-overflow-scrolling: touch;
}

body.app-portal .table-modern {
    font-size: clamp(0.8125rem, 2.5vw, 0.9375rem);
}

body.app-portal .form-control,
body.app-portal .form-select {
    min-height: 2.75rem;
    border-radius: var(--radius-sm);
    border-color: var(--border);
    background: #ffffff;
    box-shadow: 0 1px 2px rgba(23, 50, 92, 0.03) inset;
}

body.app-portal .form-control:focus,
body.app-portal .form-select:focus {
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 0.22rem rgba(0, 201, 252, 0.18);
}

body.app-portal .btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
}

body.app-portal .btn-primary,
body.app-portal .btn.btn-primary {
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.4) inset,
        0 6px 16px rgba(0, 201, 252, 0.22);
}

body.app-portal .btn-primary:hover,
body.app-portal .btn.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.45) inset,
        0 10px 22px rgba(0, 163, 202, 0.28);
}

body.app-portal .btn-primary:active,
body.app-portal .btn.btn-primary:active {
    transform: translateY(0);
}

body.app-portal .alert {
    border-radius: var(--radius);
    margin-bottom: 1rem;
    border-width: 1px;
    box-shadow: var(--shadow-sm);
}

/* Accent copy — readable navy, not yellow text */
body.app-portal .teacher-workspace-tagline,
body.app-portal .teacher-accent-yellow,
body.app-portal .student-dashboard-tagline,
body.app-portal .student-nav-section-title {
    color: var(--text-muted) !important;
}

/* Footer spacing on portal */
body.app-portal .site-footer {
    margin-top: 2.5rem !important;
    padding-bottom: env(safe-area-inset-bottom);
    background: rgba(255, 255, 255, 0.72) !important;
    border-top: 1px solid var(--border) !important;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

body.app-portal .site-footer .site-footer-brand .site-brand-rest {
    color: var(--brand-blue) !important;
}

body.app-portal .site-footer .site-footer-brand .site-brand-i {
    color: var(--brand-yellow) !important;
}

body.app-portal .nav-modern .navbar-brand .site-brand .site-brand-rest {
    color: var(--brand-blue-deep) !important;
}

body.app-portal .nav-modern .navbar-brand .site-brand .site-brand-i {
    color: var(--brand-yellow) !important;
}

body.app-portal .site-footer .site-footer-tagline {
    color: var(--brand-blue-600) !important;
}

/* Shorter brand on phones */
@media (max-width: 575.98px) {
    .nav-modern .site-title-full {
        display: none;
    }

    .nav-modern .site-title-short {
        display: inline !important;
    }

    body.app-portal .app-back-row {
        flex-direction: column;
        align-items: stretch;
    }

    body.app-portal .app-back-row .btn {
        width: 100%;
    }
}

.nav-modern .site-title-short {
    display: none;
}

/* Mobile: hamburger opens side drawer (top nav + page section menu) */
.nav-modern .app-nav-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.app-nav-burger {
    display: flex !important;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border: 2px solid var(--brand-blue, #00a3ca) !important;
    border-radius: 0.5rem;
    background: rgba(255, 255, 255, 0.92) !important;
    box-shadow: 0 2px 8px rgba(23, 50, 92, 0.12);
}

.app-nav-burger:focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 201, 252, 0.45) !important;
}

.app-burger-icon {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 1.35rem;
    height: 1rem;
}

.app-burger-line {
    display: block;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: var(--brand-blue-600, #0a4f7a);
}

.page-public-shell .app-nav-burger {
    border-color: rgba(255, 255, 255, 0.55) !important;
    background: rgba(255, 255, 255, 0.12) !important;
}

.page-public-shell .app-burger-line {
    background: #fff;
}

@media (min-width: 992px) {
    .app-nav-burger {
        display: none !important;
    }
}

.app-nav-drawer-sections {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.app-nav-drawer-sections-title {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: rgba(232, 244, 255, 0.75);
    margin-bottom: 0.65rem;
}

.app-nav-drawer-sections .app-sidebar-nav {
    background: transparent;
    border: none;
    box-shadow: none;
}

.app-nav-drawer-sections .app-sidebar-nav .card-body {
    padding: 0 !important;
}

.app-nav-drawer-sections .app-nav-heading,
.app-nav-drawer-sections .app-nav-hint {
    display: none;
}

.app-nav-drawer-sections .d-grid,
.app-nav-drawer-sections .app-nav-list {
    display: flex !important;
    flex-direction: column;
    gap: 0.35rem;
}

.app-nav-drawer-sections .app-nav-btn,
.app-nav-drawer-sections .student-nav-btn,
.app-nav-drawer-sections .btn {
    width: 100%;
    text-align: left;
    justify-content: flex-start;
    color: #e8f4ff !important;
    border-color: rgba(255, 255, 255, 0.35) !important;
}

.app-nav-drawer {
    --bs-offcanvas-width: min(300px, 88vw);
    background: linear-gradient(180deg, #0a4f7a 0%, #073d61 100%);
    color: #e8f4ff;
}

.app-nav-drawer .offcanvas-header {
    background: rgba(0, 0, 0, 0.12);
    color: #fff;
}

.app-nav-drawer .btn-close {
    filter: invert(1) grayscale(1);
    opacity: 0.85;
}

.app-nav-drawer-body .navbar-nav {
    width: 100%;
}

.app-nav-drawer-body .nav-link {
    color: #e8f4ff;
    padding: 0.65rem 0.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
}

.app-nav-drawer-body .nav-link:hover,
.app-nav-drawer-body .nav-link:focus {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.app-nav-drawer-body .user-chip {
    color: #cfe8ff;
    padding: 0.5rem 0;
}

.app-nav-drawer-body .dropdown-menu {
    position: static !important;
    transform: none !important;
    width: 100%;
    margin-top: 0.35rem;
    box-shadow: none;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

@media (max-width: 991.98px) {
    body.app-portal .student-sidebar-col,
    body.app-portal .teacher-sidebar-col {
        display: none !important;
    }

    body.app-portal .teacher-stats-in-main .teacher-stats-row {
        margin-bottom: 0.75rem !important;
    }

    body.app-portal .teacher-stats-in-main .teacher-stat-card .card-body {
        padding: 0.55rem 0.65rem !important;
    }

    body.app-portal .teacher-stats-in-main .teacher-stat-card h6 {
        font-size: 0.7rem !important;
    }

    body.app-portal .teacher-stats-in-main .teacher-stat-card h2 {
        font-size: 1rem !important;
    }
}

.class-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.class-actions .btn {
    min-height: 2.5rem;
}

@media (prefers-reduced-motion: reduce) {
    body.app-portal .app-main-panel.app-content-ready {
        animation: none;
    }
}

/* Essay question setup (create / edit quiz) */
.essay-setup-card {
    background: var(--surface-muted, #f8fafc);
    border: 1px solid var(--border, #cceef5);
    border-left: 4px solid var(--brand-blue, #00C9FC);
    border-radius: var(--radius, 12px);
    padding: 1rem 1.15rem;
}

.essay-setup-card__header {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.essay-setup-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    background: var(--brand-blue-50, #e6fafe);
    color: var(--brand-blue-deep, #006d88);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.essay-setup-card__title {
    display: block;
    color: var(--text, #17325c);
}

.essay-setup-card__lead {
    font-size: 0.875rem;
    color: var(--text-muted, #4d6589);
}

.essay-setup-step__label {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
    color: var(--text, #17325c);
}

.essay-setup-step__num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--brand-blue, #00C9FC);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
}

.essay-rubric-guide__box {
    background: #fff;
    border: 1px solid var(--border, #cceef5);
    border-radius: var(--radius-sm, 8px);
    padding: 0.65rem 0.75rem;
    height: 100%;
}

.essay-rubric-guide__box--writing {
    border-top: 3px solid #0d6efd;
}

.essay-rubric-guide__box--content {
    border-top: 3px solid #198754;
}

.essay-setup-score-split {
    padding: 0.5rem 0.65rem;
    background: #fff;
    border: 1px dashed var(--border-strong, #99e0f0);
    border-radius: var(--radius-sm, 8px);
}

.essay-setup-card code {
    font-size: 0.85em;
    color: #b02a37;
    background: #fff;
    padding: 0.1em 0.35em;
    border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
    body.app-portal .btn-primary,
    body.app-portal .btn.btn-primary,
    body.app-portal .edu-stat-card,
    body.app-portal .edu-course-card {
        transition: none !important;
        transform: none !important;
    }
}