:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --warning-color: #f72585;
    --danger-color: #e63946;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #f8f9fa;
    margin-top: 0;
    padding-top: 0;
}

.countdown {
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
    color: var(--danger-color);
}

main {
    flex: 1;
}

.card {
    border: none;
    border-radius: 0.75rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.card-header {
    background-color: #fff;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    font-weight: 600;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
}

.table {
    background-color: #fff;
    border-radius: 0.5rem;
    overflow: hidden;
}

.table th {
    font-weight: 600;
    border-bottom-width: 1px;
}

.table-hover tbody tr:hover {
    background-color: rgba(67, 97, 238, 0.05);
}

.btn {
    border-radius: 0.5rem;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.badge {
    font-weight: 500;
    padding: 0.4em 0.8em;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(67, 97, 238, 0.25);
}

.alert {
    border: none;
    border-radius: 0.5rem;
}

.card.bg-primary,
.card.bg-warning,
.card.bg-info,
.card.bg-danger {
    border-radius: 1rem;
}

.card.bg-primary:hover,
.card.bg-warning:hover,
.card.bg-info:hover,
.card.bg-danger:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.nav-tabs .nav-link {
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    color: #6c757d;
    border: none;
}

.nav-tabs .nav-link:hover {
    color: #000;
    border: none;
}

.nav-tabs .nav-link.active {
    color: #000;
    font-weight: 700;
    border-bottom: 3px solid #000;
    background: transparent;
}

.footer {
    border-top: 1px solid #e9ecef;
}

.card.shadow {
    border-radius: 1rem;
}

.text-muted.display-1 {
    color: #dee2e6;
}

@media (max-width: 768px) {
    .card-body {
        padding: 0.75rem;
    }

    .table-responsive {
        font-size: 0.85rem;
    }
}

.custom-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.custom-table thead th {
    border-bottom: 2px solid #dee2e6;
    font-size: 0.8rem;
    color: #495057;
    font-weight: 600;
    padding: 0.35rem 0.5rem;
    white-space: nowrap;
    background-color: #f1f3f5;
}

.custom-table tbody tr {
    transition: background-color 0.2s;
}

.custom-table tbody td {
    border-bottom: 1px solid #dee2e6;
    vertical-align: middle;
    padding: 0.35rem 0.5rem;
    font-size: 0.9rem;
}

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

.page-header {
    margin-bottom: 0.75rem;
}

.form-control-custom,
.form-select-custom,
.btn-custom {
    padding: 0.25rem 0.5rem;
    font-size: 0.9rem;
    border-radius: 0.25rem;
}

.bi-circle,
.bi-check-circle-fill {
    font-size: 1rem;
}

.countdown-urgent {
    color: #dc3545;
    font-weight: 700;
}

.countdown-warning {
    color: #fd7e14;
    font-weight: 700;
}

@keyframes pulse-bg {
    0%, 100% { background-color: #fff3cd; }
    50%       { background-color: #ffe69c; }
}

@keyframes pulse-bg-danger {
    0%, 100% { background-color: #f8d7da; }
    50%       { background-color: #f5c2c7; }
}

@keyframes blink-text {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.7; }
}

@keyframes blink-banner {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.75; }
}

.anxiety-warning {
    animation: pulse-bg 2s infinite;
}

.anxiety-danger {
    animation: pulse-bg-danger 1s infinite;
}

.urgent-banner {
    position: relative;
    animation: blink-banner 1.5s infinite;
}

@media (prefers-reduced-motion: reduce) {
    *, ::before, ::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

#weekday_group,
#day_group {
    display: none;
}

.btn-touch {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.copy-feedback {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    opacity: 0;
    transform: translateY(0.5rem);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
}

.copy-feedback.show {
    opacity: 1;
    transform: translateY(0);
}

.title-clamp {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-all;
}

.sort-th a {
    color: inherit;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}
.sort-th a:hover { color: var(--primary-color); }

.subject-group-row td {
    background-color: #e9ecef;
    font-weight: 700;
    font-size: 0.8rem;
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    user-select: none;
}

.assignment-row[data-priority="high"] td:first-child {
    box-shadow: inset 3px 0 0 #dc3545;
}
.assignment-row[data-priority="medium"] td:first-child {
    box-shadow: inset 3px 0 0 #fd7e14;
}
.assignment-row[data-priority="low"] td:first-child {
    box-shadow: inset 3px 0 0 #adb5bd;
}

tr.row-pinned {
    background-color: #fffbe6 !important;
}
tr.row-pinned:hover {
    background-color: #fff3cd !important;
}
.pin-btn.pinned { color: #ffc107; }
.pin-btn:not(.pinned) { color: #dee2e6; }
.pin-btn:not(.pinned):hover { color: #ffc107; }

#bulkBar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: #4361ee;
    color: #fff;
    padding: 0.4rem 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.kanban-col-body {
    min-height: 100px;
    max-height: 70vh;
    overflow-y: auto;
}
.kanban-card {
    background: #fff;
    border: 1px solid #dee2e6;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}
.kanban-card:last-child { margin-bottom: 0; }

tr.kb-focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

@media (max-width: 575.98px) {
    .custom-table thead {
        display: none;
    }
    .custom-table tbody tr.assignment-row,
    .custom-table tbody tr.recurring-row,
    .custom-table tbody tr.user-row {
        display: block;
        position: relative;
        padding: 0.75rem;
        border-bottom: 1px solid #dee2e6;
    }
    .custom-table tbody tr.assignment-row td,
    .custom-table tbody tr.recurring-row td,
    .custom-table tbody tr.user-row td {
        display: inline-block;
        border: none;
        padding: 0;
    }

    tr.assignment-row td:nth-child(1) {
        position: absolute;
        top: 0.75rem;
        left: 0.75rem;
    }
    tr.assignment-row td:nth-child(2) {
        position: absolute;
        top: 0.75rem;
        left: 2.25rem;
    }
    tr.assignment-row td:nth-child(3) {
        display: inline-block;
        margin-left: 4rem;
        margin-right: 0.5rem;
    }
    tr.assignment-row td:nth-child(4) {
        display: inline-block;
        margin-right: 0.5rem;
    }
    tr.assignment-row td:nth-child(5) {
        display: block;
        margin-left: 0;
        margin-right: 4rem;
        margin-bottom: 0.5rem;
    }
    tr.assignment-row td:nth-child(6) {
        display: inline-block;
        margin-right: 0.5rem;
    }
    tr.assignment-row td:nth-child(7) {
        display: inline-block;
    }
    tr.assignment-row td:nth-child(8) {
        position: absolute;
        top: 0.75rem;
        right: 0.75rem;
    }
    .countdown-col {
        white-space: nowrap;
        font-size: 0.75rem;
    }

    tr.recurring-row td:nth-child(1) {
        display: block;
        margin-bottom: 0.5rem;
        margin-right: 3rem;
    }
    tr.recurring-row td:nth-child(2),
    tr.recurring-row td:nth-child(3),
    tr.recurring-row td:nth-child(4) {
        display: inline-block;
        margin-right: 0.5rem;
    }
    tr.recurring-row td:nth-child(5) {
        position: absolute;
        top: 0.75rem;
        right: 0.75rem;
    }

    tr.user-row td:nth-child(1),
    tr.user-row td:nth-child(5) {
        display: none !important;
    }
    tr.user-row td:nth-child(2) {
        display: block;
        font-weight: bold;
        margin-bottom: 0.25rem;
    }
    tr.user-row td:nth-child(3) {
        display: block;
        font-size: 0.85rem;
        color: #6c757d;
        margin-bottom: 0.5rem;
    }
    tr.user-row td:nth-child(4) {
        display: inline-block;
    }
    tr.user-row td:nth-child(6) {
        position: absolute;
        top: 0.75rem;
        right: 0.75rem;
    }

    .stats-table {
        min-width: auto !important;
    }
    .stats-table thead th:nth-child(3),
    .stats-table thead th:nth-child(4),
    .stats-table thead th:nth-child(5) {
        display: none !important;
    }
    tr.subject-row td:nth-child(3),
    tr.subject-row td:nth-child(4),
    tr.subject-row td:nth-child(5) {
        display: none !important;
    }

    .dashboard-stat-card .display-4 {
        font-size: 1.5rem !important;
    }
    .dashboard-stat-card h2 {
        font-size: 1.4rem;
    }
    .dashboard-stat-card h6 {
        font-size: 0.7rem;
    }
    .urgent-countdown {
        font-size: 1.05rem !important;
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
    }
}

@media (max-width: 767.98px) {
    .nav-tabs#assignmentTabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    .nav-tabs#assignmentTabs::-webkit-scrollbar {
        display: none;
    }
    .nav-tabs#assignmentTabs .ms-auto {
        margin-left: 0 !important;
    }
}