/* ============================================
   Электронный журнал — Dark Theme CSS
   ============================================ */

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

:root {
    --primary: #20c997;
    --primary-dark: #17a882;
    --secondary: #2ecc71;
    --success: #2ecc71;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    --bg: #181818;
    --card-bg: rgba(255, 255, 255, 0.04);
    --border: rgba(255, 255, 255, 0.1);
    --text: #e0e0e0;
    --text-muted: #a0a0a0;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: .2s ease;
    --font: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
}

html {
    font-size: 15px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    color: #fff;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: #fff;
    font-weight: 700;
    line-height: 1.3;
}

img {
    max-width: 100%;
}

/* ----- Navbar ----- */
.navbar {
    background: #1e1e1e;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

.navbar-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    height: 62px;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    color: #fff !important;
    font-size: 1.2rem;
    font-weight: 800;
    flex-shrink: 0;
}

.navbar-logo {
    height: 36px !important;
    width: auto !important;
    filter: brightness(1.2);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.brand-text small {
    font-weight: 400;
    opacity: .6;
    font-size: .7rem;
    margin-top: 2px;
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.4rem;
    cursor: pointer;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: .5rem;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: .1rem;
    flex: 1;
    justify-content: center;
    padding: 0 1rem;
}

.nav-link {
    color: rgba(255, 255, 255, .65) !important;
    padding: .45rem .7rem;
    border-radius: 8px;
    font-size: .83rem;
    font-weight: 500;
    transition: all var(--transition);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(32, 201, 151, .2);
    color: #fff !important;
}

.nav-link i {
    margin-right: .3rem;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: .6rem;
    margin-left: 1rem;
    flex-shrink: 0;
    padding-left: 1rem;
    border-left: 1px solid var(--border);
}

.user-avatar-sm {
    width: 34px;
    height: 34px;
    min-width: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: .85rem;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.user-name {
    font-size: .85rem;
    font-weight: 600;
    color: #fff;
}

.user-role {
    font-size: .7rem;
    color: var(--text-muted);
}

.btn-logout {
    color: var(--text-muted) !important;
    padding: .4rem;
    border-radius: 50%;
    transition: all var(--transition);
}

.btn-logout:hover {
    color: var(--danger) !important;
    background: rgba(231, 76, 60, .15);
}

/* ----- Main ----- */
.main-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.5rem;
    min-height: calc(100vh - 62px - 48px);
}

.main-guest {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #181818;
}

/* ----- Footer ----- */
.footer {
    background: rgba(0, 0, 0, .3);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    padding: .8rem 1.5rem;
    font-size: .8rem;
}

.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: .5rem;
}

.footer-logo {
    height: 20px;
    width: auto;
    display: inline-block;
    vertical-align: middle;
}

/* ----- Flash ----- */
.flash {
    position: fixed;
    top: 72px;
    right: 1.5rem;
    padding: .8rem 1.2rem;
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: .9rem;
    display: flex;
    align-items: center;
    gap: .6rem;
    z-index: 9999;
    animation: slideIn .3s ease;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
}

.flash-success {
    background: var(--success);
}

.flash-error {
    background: var(--danger);
}

.flash-info {
    background: var(--info);
}

.flash-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: auto;
}

@keyframes slideIn {
    from {
        transform: translateX(100px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ----- Cards ----- */
.card {
    background: #242424;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}

.card:hover {
    border-color: rgba(32, 201, 151, .25);
}

.card-header {
    background: #1e1e1e;
    border-bottom: 1px solid var(--border);
    color: #fff;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h2,
.card-header h3 {
    color: #fff;
    margin: 0;
    font-size: 1rem;
}

.card-header i {
    margin-right: .5rem;
}

.card-body {
    padding: 1.5rem;
}

.card-body-np {
    padding: 0;
}

/* ----- Stats ----- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.2rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: rgba(32, 201, 151, .3);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
    background: transparent;
}

.stat-icon.blue {
    color: #06b6d4;
}

.stat-icon.green {
    color: #2ecc71;
}

.stat-icon.orange {
    color: #f59e0b;
}

.stat-icon.purple {
    color: #20c997;
}

.stat-icon.red {
    color: #ef4444;
}

.stat-info {
    flex: 1;
}

.stat-value {
    font-size: 1.7rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.1;
}

.stat-label {
    font-size: .8rem;
    color: var(--text-muted);
    margin-top: .2rem;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: .88rem;
}

table thead th {
    background: rgba(32, 201, 151, .15);
    color: rgba(255, 255, 255, .8);
    padding: .7rem 1rem;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
    border-bottom: 1px solid var(--border);
}

table tbody td {
    padding: .6rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, .04);
    vertical-align: middle;
    color: var(--text);
}

table tbody tr:hover {
    background: rgba(255, 255, 255, .03);
}

table tbody tr:last-child td {
    border-bottom: none;
}

/* ----- Buttons ----- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .55rem 1.2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: .88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    font-family: var(--font);
}

.btn:active {
    transform: scale(.97);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
}

.btn-primary:hover {
    filter: brightness(1.12);
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-success:hover {
    background: #219a52;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-warning {
    background: var(--warning);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: rgba(255, 255, 255, .7);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, .08);
    color: #fff;
    border-color: rgba(255, 255, 255, .2);
}

.btn-sm {
    padding: .35rem .8rem;
    font-size: .8rem;
}

.btn-xs {
    padding: .2rem .5rem;
    font-size: .75rem;
}

/* ----- Forms ----- */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: .85rem;
    margin-bottom: .35rem;
    color: rgba(255, 255, 255, .75);
}

.form-control {
    width: 100%;
    padding: .6rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .9rem;
    font-family: var(--font);
    transition: border-color var(--transition), box-shadow var(--transition);
    background: rgba(255, 255, 255, .07);
    color: #fff;
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(32, 201, 151, .2);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%23aaa'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    background-color: rgba(255, 255, 255, .07);
}

select.form-control option {
    background: #1e1e1e;
    color: #fff;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* ----- Login ----- */
.login-container {
    width: 100%;
    max-width: 440px;
    padding: 1.5rem;
}

.login-card {
    background: rgba(255, 255, 255, .05);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.login-header {
    background: linear-gradient(135deg, rgba(32, 201, 151, .35), rgba(34, 197, 94, .35));
    color: #fff;
    padding: 2rem 2rem 1.5rem;
    text-align: center;
}

.login-logo {
    height: 80px !important;
    width: auto !important;
    display: block;
    margin: 0 auto 1.2rem;
}

.login-header h1 {
    color: #fff;
    font-size: 1.4rem;
    margin-bottom: .2rem;
}

.login-header p {
    color: rgba(255, 255, 255, .6);
    font-size: .85rem;
}

.login-body {
    padding: 2rem;
}

.login-body .form-group {
    margin-bottom: 1.2rem;
}

.login-body .btn {
    width: 100%;
    justify-content: center;
    padding: .7rem;
    font-size: 1rem;
}

.login-footer {
    text-align: center;
    padding: 1rem 2rem 1.5rem;
    color: var(--text-muted);
    font-size: .82rem;
}

.login-footer a {
    color: var(--primary);
}

/* ----- Grade badge ----- */
.grade-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    font-weight: 700;
    font-size: .85rem;
    color: #fff;
}

/* ----- Announcements ----- */
.announcement-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1.2rem 1.5rem;
    border-left: 4px solid var(--primary);
    transition: all var(--transition);
}

.announcement-card:hover {
    border-color: rgba(32, 201, 151, .4);
}

.announcement-card.pinned {
    border-left-color: var(--warning);
}

.announcement-title {
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: .4rem;
}

.announcement-meta {
    font-size: .8rem;
    color: var(--text-muted);
    margin-bottom: .6rem;
    display: flex;
    align-items: center;
    gap: .4rem;
    flex-wrap: wrap;
}

.announcement-content {
    font-size: .9rem;
    line-height: 1.7;
    color: var(--text);
}

/* ----- Welcome banner ----- */
.welcome-banner {
    background: linear-gradient(135deg, #1e1e1e 0%, #134e4a 60%, #064e3b 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.8rem 2rem;
    color: #fff;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.welcome-banner::after {
    content: '';
    position: absolute;
    right: -30px;
    top: -30px;
    width: 160px;
    height: 160px;
    background: rgba(32, 201, 151, .1);
    border-radius: 50%;
    pointer-events: none;
}

.welcome-banner h1 {
    color: #fff;
    font-size: 1.5rem;
    margin-bottom: .3rem;
}

.welcome-banner p {
    color: rgba(255, 255, 255, .6);
    font-size: .9rem;
}

.welcome-banner .welcome-date {
    font-size: .83rem;
    color: rgba(255, 255, 255, .4);
    margin-top: .4rem;
    display: flex;
    align-items: center;
    gap: .3rem;
}

/* ----- Page header ----- */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    margin: 0;
    font-size: 1.5rem;
}

/* ----- Modal ----- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .7);
    z-index: 5000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    backdrop-filter: blur(4px);
}

.modal-overlay.open {
    display: flex;
}

.modal-box {
    background: #242424;
    border: 1px solid rgba(32, 201, 151, .3);
    border-radius: 20px;
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0, 0, 0, .8);
    animation: modalIn .2s ease;
    padding: 1.5rem;
}

.modal-lg {
    max-width: 640px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.2rem;
}

.modal-header h3 {
    margin: 0;
    color: #fff;
    font-size: 1.1rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: .2rem;
    line-height: 1;
    transition: color var(--transition);
}

.modal-close:hover {
    color: var(--danger);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: .5rem;
    margin-top: 1.2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

@keyframes modalIn {
    from {
        transform: scale(.92);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* ----- Empty state ----- */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    color: rgba(255, 255, 255, .1);
    margin-bottom: 1rem;
    display: block;
}

.empty-state p {
    margin-bottom: 1rem;
}

/* ----- Pagination ----- */
.pagination {
    display: flex;
    gap: .3rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.pagination a,
.pagination span {
    padding: .4rem .8rem;
    border-radius: 8px;
    font-size: .85rem;
    font-weight: 600;
    display: inline-block;
}

.pagination a {
    background: var(--card-bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.pagination a:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.pagination .active {
    background: var(--primary);
    color: #fff;
    border: 1px solid var(--primary);
}

/* ----- Att badge ----- */
.att-badge {
    display: inline-block;
    padding: .15rem .6rem;
    border-radius: 10px;
    font-size: .78rem;
    font-weight: 600;
    color: #fff;
}

/* ----- Progress ----- */
.progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, .08);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width .5s ease;
}

/* ----- Nav arrows ----- */
.nav-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, .7) !important;
    transition: all var(--transition);
    padding: .3rem .5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.nav-arrow:hover {
    background: rgba(255, 255, 255, .08);
    color: #fff !important;
}

/* ----- Utility ----- */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: var(--text-muted);
}

.text-danger {
    color: var(--danger);
}

.text-success {
    color: var(--success);
}

.mt-1 {
    margin-top: .5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mt-3 {
    margin-top: 1.5rem;
}

.mb-1 {
    margin-bottom: .5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.d-flex {
    display: flex;
}

.gap-1 {
    gap: .5rem;
}

.gap-2 {
    gap: 1rem;
}

.align-center {
    align-items: center;
}

.flex-wrap {
    flex-wrap: wrap;
}

/* ----- Responsive ----- */
@media (max-width: 900px) {
    .navbar-toggle {
        display: block;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: 62px;
        left: 0;
        right: 0;
        background: #1a1a1a;
        flex-direction: column;
        padding: 1rem;
        gap: .3rem;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border);
    }

    .navbar-menu.open {
        display: flex;
        animation: slideDown .25s ease;
    }

    .navbar-nav {
        flex-direction: column;
        width: 100%;
        align-items: flex-end;
    }

    .nav-link {
        padding: .7rem 1rem;
        display: block;
    }

    .navbar-user {
        border-left: none;
        margin-left: 0;
        padding-left: 0;
        padding-top: .8rem;
        border-top: 1px solid var(--border);
        width: 100%;
        display: flex;
        justify-content: flex-end;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

@media (max-width: 600px) {
    .main-content {
        padding: 1rem;
    }

    .welcome-banner {
        padding: 1.2rem;
    }

    .welcome-banner h1 {
        font-size: 1.2rem;
    }

    .card-body {
        padding: 1rem;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .modal-box {
        padding: 1.2rem;
    }
}

/* ===== ANIMATIONS ===== */

/* Page load fade-in */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

@keyframes glow {

    0%,
    100% {
        box-shadow: 0 0 5px rgba(32, 201, 151, .2);
    }

    50% {
        box-shadow: 0 0 20px rgba(32, 201, 151, .4);
    }
}

@keyframes bounceIn {
    0% {
        transform: scale(.3);
        opacity: 0;
    }

    50% {
        transform: scale(1.05);
    }

    70% {
        transform: scale(.9);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Staggered entrance for cards */
.card,
.stat-card,
.announcement-card,
.group-card {
    animation: fadeInUp .4s ease both;
}

.stats-grid .stat-card:nth-child(1) {
    animation-delay: .05s;
}

.stats-grid .stat-card:nth-child(2) {
    animation-delay: .1s;
}

.stats-grid .stat-card:nth-child(3) {
    animation-delay: .15s;
}

.stats-grid .stat-card:nth-child(4) {
    animation-delay: .2s;
}

/* Hover glow on cards */
.card {
    transition: border-color .25s, box-shadow .25s, transform .25s;
}

.card:hover {
    box-shadow: 0 4px 24px rgba(32, 201, 151, .1);
}

/* Stat card hover */
.stat-card {
    transition: transform .25s, border-color .25s, box-shadow .25s;
}

.stat-card:hover {
    box-shadow: 0 6px 20px rgba(32, 201, 151, .12);
}

.stat-card:hover .stat-icon i {
    animation: bounceIn .4s ease;
}

/* Button hover & click */
.btn {
    transition: all .2s ease;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, .3);
}

.btn:active {
    transform: scale(.96) translateY(0);
}

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(32, 201, 151, .3);
}

/* Ripple effect */
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%), rgba(255, 255, 255, .3), transparent 60%);
    opacity: 0;
    transition: opacity .3s;
    pointer-events: none;
}

.btn.ripple::after {
    opacity: 1;
    transition: opacity 0s;
}

/* Nav link hover */
.nav-link {
    transition: all .2s ease;
    position: relative;
}

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

.nav-link.active {
    animation: fadeIn .2s ease;
}

/* Table row hover */
table tbody tr {
    transition: background .15s, transform .15s;
}

table tbody tr:hover {
    background: rgba(32, 201, 151, .05);
}

/* Announcement card hover */
.announcement-card {
    transition: all .25s ease;
}

.announcement-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, .3);
}

/* Group card hover */
.group-card {
    transition: all .25s ease;
}

.group-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, .3);
}

.group-card.active {
    animation: glow 2s ease infinite;
}

/* Welcome banner */
.welcome-banner {
    transition: transform .3s;
}

.welcome-banner:hover {
    transform: translateY(-2px);
}

.welcome-banner::after {
    transition: transform .5s;
}

.welcome-banner:hover::after {
    transform: scale(1.2);
}

/* Modal entrance */
.modal-overlay.open .modal-box {
    animation: bounceIn .3s ease;
}

/* Form control focus */
.form-control {
    transition: border-color .25s, box-shadow .25s, background .25s;
}

.form-control:focus {
    animation: glow 1.5s ease infinite;
}

/* Flash messages */
.flash {
    animation: slideIn .3s ease, pulse .5s ease .3s;
}

/* Grade badge hover */
.grade-badge,
.grade-item {
    transition: transform .15s, box-shadow .15s;
}

.grade-badge:hover,
.grade-item:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 8px rgba(0, 0, 0, .3);
}

/* Progress bar fill animation */
.progress-fill {
    animation: shimmer 2s ease infinite;
    background-size: 200% 100%;
    background-image: linear-gradient(90deg, transparent, rgba(255, 255, 255, .15), transparent);
}

/* Pagination hover */
.pagination a {
    transition: all .2s ease;
}

.pagination a:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(32, 201, 151, .3);
}

/* Logout button */
.btn-logout {
    transition: all .25s ease;
}

.btn-logout:hover {
    transform: rotate(90deg);
}

/* Scroll-triggered fade-in */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity .5s ease, transform .5s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered children */
.stagger-children>*:nth-child(1) {
    transition-delay: .05s;
}

.stagger-children>*:nth-child(2) {
    transition-delay: .1s;
}

.stagger-children>*:nth-child(3) {
    transition-delay: .15s;
}

.stagger-children>*:nth-child(4) {
    transition-delay: .2s;
}

.stagger-children>*:nth-child(5) {
    transition-delay: .25s;
}

.stagger-children>*:nth-child(6) {
    transition-delay: .3s;
}

/* Skeleton loading shimmer */
.skeleton {
    background: linear-gradient(90deg, #242424 25%, #2a2a2a 50%, #242424 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease infinite;
    border-radius: 8px;
}

/* Navbar brand hover */
.navbar-brand {
    transition: transform .2s;
}

.navbar-brand:hover {
    transform: scale(1.03);
}

/* Logo spin on hover */
.navbar-logo {
    transition: transform .3s;
}

.navbar-brand:hover .navbar-logo {
    transform: rotate(10deg);
}