/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    position: relative;
    overflow: visible;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    animation: slideUpCard 0.5s cubic-bezier(0.25, 0.8, 0.25, 1) both;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.12);
}

.card:hover::before {
    opacity: 1;
}

.create-card {
    z-index: 10;
}

.card h2 {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ===== Form Structure ===== */
.form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-group {
    flex: 1;
    min-width: 160px;
}

.form-group label {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input,
.filter-row input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: all var(--transition);
}

.form-group input::placeholder,
.filter-row input::placeholder {
    color: var(--text-placeholder);
    transition: opacity var(--transition);
}

.form-group input:focus,
.filter-row input:focus {
    background: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
    transform: translateY(-1px);
}

.form-group input:focus::placeholder,
.filter-row input:focus::placeholder {
    opacity: 0.5;
}

.schedule-section-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 1rem 0 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.schedule-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.35rem;
    padding: 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
}

.schedule-slots-panel {
    margin-top: 1rem;
}

.schedule-slots-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.schedule-slot-row {
    display: grid;
    grid-template-columns: repeat(7, minmax(130px, 1fr)) auto;
    gap: 0.75rem;
    align-items: end;
    padding: 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
}

.schedule-slot-summary,
.schedule-semester-line {
    margin-bottom: 0.35rem;
}

.schedule-semester-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.schedule-inline-table {
    margin-top: 1rem;
}

.calendar-fill-panel {
    display: grid;
    grid-template-columns: repeat(4, minmax(150px, 1fr)) auto;
    gap: 0.75rem;
    align-items: end;
    margin: 1rem 0;
    padding: 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
}

.academic-calendar-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.calendar-course-block {
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    overflow: hidden;
}

.calendar-course-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--bg-card-border);
}

.calendar-course-header h3 {
    font-size: 1rem;
}

.calendar-course-header span {
    color: var(--text-secondary);
    font-size: 0.78rem;
}

.calendar-semesters-grid {
    display: grid;
    gap: 0.75rem;
    padding: 0.75rem;
}

.calendar-semester-block {
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    overflow: hidden;
}

.calendar-semester-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 36px;
    padding: 0.45rem 0.65rem;
    border-bottom: 1px solid var(--bg-card-border);
}

.calendar-semester-header h4 {
    margin: 0;
    font-size: 0.86rem;
}

.calendar-semester-header span {
    color: var(--text-secondary);
    font-size: 0.72rem;
    white-space: nowrap;
}

.calendar-semester-table-wrap {
    overflow-x: auto;
    background: var(--bg-primary);
}

.calendar-semester-table {
    width: max-content;
    min-width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
    font-size: 0.68rem;
}

.calendar-semester-table th,
.calendar-semester-table td {
    border: 1px solid var(--bg-card-border);
}

.calendar-semester-table thead th {
    position: sticky;
    top: 0;
    z-index: 1;
    height: 22px;
    min-width: 26px;
    padding: 0 0.2rem;
    background: var(--bg-input);
    color: var(--text-secondary);
    font-weight: 700;
    text-align: center;
}

.calendar-semester-table .calendar-day-head {
    position: sticky;
    left: 0;
    z-index: 2;
    width: 36px;
    min-width: 36px;
    background: var(--bg-input);
    color: var(--text-secondary);
    font-weight: 700;
    text-align: center;
}

.calendar-day {
    position: relative;
    width: 26px;
    min-width: 26px;
    height: 24px;
    min-height: 24px;
    padding: 0;
    background: color-mix(in srgb, var(--activity-color, var(--accent)) 9%, var(--bg-card));
    cursor: pointer;
    outline: none;
    box-shadow: inset 0 2px 0 var(--activity-color, var(--accent));
    text-align: center;
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

.calendar-day:hover,
.calendar-day:focus-visible {
    background: color-mix(in srgb, var(--activity-color, var(--accent)) 18%, var(--bg-card));
    box-shadow: inset 0 2px 0 var(--activity-color, var(--accent)), 0 0 0 2px color-mix(in srgb, var(--activity-color, var(--accent)) 36%, transparent);
    transform: scale(1.08);
    z-index: 3;
}

.calendar-day-code {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--text-primary);
    font-size: 0.68rem;
    line-height: 1;
    font-weight: 800;
}

.calendar-day-activity {
    display: none !important;
}

.calendar-empty-day {
    width: 26px;
    min-width: 26px;
    height: 24px;
    background: color-mix(in srgb, var(--bg-input) 65%, transparent);
}

.calendar-empty-semester {
    padding: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.calendar-totals {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.calendar-total-chip {
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    background: color-mix(in srgb, var(--chip-color) 18%, transparent);
    border: 1px solid color-mix(in srgb, var(--chip-color) 52%, transparent);
    color: var(--text-primary);
    font-size: 0.8rem;
    font-weight: 600;
}

.calendar-day-dialog-card {
    max-width: 560px;
}

.calendar-day-dialog-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
    margin: 0.75rem 0;
}

.calendar-day-dialog-grid div {
    padding: 0.75rem;
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
}

.calendar-day-dialog-grid span {
    display: block;
    color: var(--text-secondary);
    font-size: 0.78rem;
    margin-bottom: 0.25rem;
}

.calendar-day-dialog-grid strong {
    font-size: 0.95rem;
}

.calendar-day-dialog-activity {
    display: flex;
    gap: 0.8rem;
    align-items: center;
    margin: 0.8rem 0 1rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
}

.calendar-day-dialog-code {
    width: 46px;
    min-width: 46px;
    height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: color-mix(in srgb, var(--activity-color, var(--accent)) 20%, transparent);
    border: 1px solid color-mix(in srgb, var(--activity-color, var(--accent)) 55%, transparent);
    font-weight: 800;
}

.calendar-day-dialog-activity p {
    margin: 0.2rem 0 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.profiles-context {
    color: var(--text-secondary);
    font-weight: 600;
    margin: -0.25rem 0 0.75rem;
}

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

@media (max-width: 1180px) {
    .schedule-slot-row {
        grid-template-columns: repeat(2, minmax(180px, 1fr));
    }

    .calendar-fill-panel {
        grid-template-columns: repeat(2, minmax(180px, 1fr));
    }

    .calendar-semester-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.2rem;
    }
}

@media (max-width: 640px) {
    .schedule-slot-row {
        grid-template-columns: 1fr;
    }

    .calendar-fill-panel {
        grid-template-columns: 1fr;
    }

    .calendar-day-dialog-grid {
        grid-template-columns: 1fr;
    }
}

/* Hide Number Arrows */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

/* ===== Premium Custom Dropdown Styles ===== */
.custom-select-wrapper {
    position: relative;
    width: 100%;
    user-select: none;
    font-family: inherit;
}

.custom-select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    outline: none;
    transition: all var(--transition);
}

.filter-row .custom-select-trigger {
    padding: 0.45rem 1rem;
    font-size: 0.85rem;
    border-color: transparent;
}

.custom-select-trigger:hover {
    background: var(--bg-hover);
}

.custom-select-trigger:focus,
.custom-select-wrapper.open .custom-select-trigger {
    background: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
    transform: translateY(-1px);
}

.filter-row .custom-select-wrapper.open .custom-select-trigger,
.filter-row .custom-select-trigger:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.custom-select-trigger.placeholder-active .custom-select-text {
    color: var(--text-placeholder);
}

.custom-select-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.custom-select-icon {
    margin-left: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.custom-select-wrapper.open .custom-select-icon {
    transform: rotate(180deg);
    color: var(--accent);
}

.custom-select-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    width: 100%;
    max-height: 280px;
    overflow-y: auto;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    padding: 0.5rem;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top center;
    transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s ease;
    list-style: none;
    margin: 0;
}

.custom-select-wrapper.open .custom-select-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Custom Scrollbar for Dropdown */
.custom-select-menu::-webkit-scrollbar {
    width: 6px;
}
.custom-select-menu::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 8px;
}
.custom-select-menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 8px;
}
.custom-select-menu::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

.custom-select-item {
    padding: 0.6rem 0.8rem;
    margin-bottom: 0.15rem;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, padding-left 0.2s ease;
}

.custom-select-item:last-child {
    margin-bottom: 0;
}

.custom-select-item:hover:not(.disabled) {
    background: var(--bg-hover);
    padding-left: 1.1rem;
}

.custom-select-item.selected {
    background: var(--accent-glow);
    color: #fff;
    font-weight: 500;
}

.custom-select-item.selected:hover {
    background: var(--accent-glow);
    padding-left: 0.8rem;
}

.custom-select-item.disabled {
    color: var(--text-secondary);
    opacity: 0.6;
    cursor: not-allowed;
}

.custom-select-item.placeholder-item {
    display: none; /* Hide placeholder options in the actual dropdown list naturally */
}

/* Light theme selects */
[data-theme="light"] .form-group input,
[data-theme="light"] .filter-row input,
[data-theme="light"] .custom-select-trigger {
    border-color: rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .custom-select-menu {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.05) inset;
}

[data-theme="light"] .custom-select-menu::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
}
[data-theme="light"] .custom-select-menu::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.25);
}

[data-theme="light"] .custom-select-item.selected {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-hover);
}

/* Filter Row */
.card-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.card-header-row h2 {
    margin-bottom: 0;
}

.filter-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-row label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.filter-row input {
    padding: 0.45rem 2rem 0.45rem 0.7rem;
    background: var(--bg-input);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.filter-row input:focus {
    background-color: var(--bg-input-focus);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}


/* ===== Custom Multi-Select ===== */
.custom-multi-select {
    position: relative;
    user-select: none;
    width: 100%;
}

.select-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
}

.select-box:hover {
    background: var(--bg-hover);
}

.select-box.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.dropdown-icon {
    transition: transform var(--transition);
}

.select-box.active .dropdown-icon {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.05) inset;
    padding: 0.5rem;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top center;
    transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s ease;
}

[data-theme="light"] .custom-multi-select .dropdown-menu {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.05) inset;
}

.dropdown-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.checkbox-group-vertical {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

.checkbox-group-vertical::-webkit-scrollbar {
    width: 6px;
}
.checkbox-group-vertical::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 8px;
}
.checkbox-group-vertical::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 8px;
}
.checkbox-group-vertical::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

[data-theme="light"] .checkbox-group-vertical::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
}
[data-theme="light"] .checkbox-group-vertical::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.25);
}

.checkbox-item {
    display: flex;
    align-items: center;
    position: relative;
    padding: 0.5rem 0.5rem 0.5rem 2.25rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    user-select: none;
    transition: background 0.2s ease;
}

.checkbox-item:hover {
    background: var(--bg-hover);
}

.checkbox-item input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkbox-item .checkmark {
    position: absolute;
    top: 50%;
    left: 0.6rem;
    transform: translateY(-50%);
    height: 1.15rem;
    width: 1.15rem;
    background-color: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: 4px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkbox-item:hover input ~ .checkmark {
    border-color: var(--accent);
}

.checkbox-item input:focus ~ .checkmark {
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.checkbox-item input:checked ~ .checkmark {
    background-color: var(--accent);
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.3);
}

.checkmark::after {
    content: "";
    display: none;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-bottom: 2px;
}

.checkbox-item input:checked ~ .checkmark::after {
    display: block;
}

/* ===== Buttons ===== */
.btn-primary {
    position: relative;
    overflow: hidden;
    padding: 0.75rem 1.75rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(rgba(255, 255, 255, 0.2), transparent);
    border-radius: inherit;
    opacity: 0;
    transition: opacity var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--accent-glow);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-delete {
    padding: 0.35rem 0.7rem;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    border-radius: var(--radius-sm);
    color: var(--error);
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-delete:hover {
    background: rgba(248, 113, 113, 0.2);
    transform: scale(1.05);
}

.btn-icon-toggle {
    background: transparent;
    border: 1px solid var(--bg-card-border);
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
}

.btn-icon-toggle:hover {
    background: var(--bg-card);
    border-color: var(--accent);
    color: var(--accent);
    transform: rotate(45deg);
    box-shadow: 0 0 10px var(--accent-glow);
}

.btn-edit-classroom {
    padding: 0.35rem 0.7rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-sm);
    color: var(--accent-hover);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-edit-classroom:hover {
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-1px);
}

/* ===== Alerts ===== */
.form-alert {
    display: none;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-top: 0.75rem;
}

.form-alert.error {
    display: block;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
    color: var(--error);
    animation: slideDownAlert 0.3s ease-out both;
}

.form-alert.success {
    display: block;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.2);
    color: var(--success);
    animation: slideDownAlert 0.3s ease-out both;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    text-align: left;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.6rem 0.8rem;
    border-bottom: 1px solid var(--bg-card-border);
}

/* Sortable columns */
thead th.sortable {
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: color 0.2s ease;
}

thead th.sortable:hover {
    color: var(--accent);
}

thead th.sortable.sort-active {
    color: var(--accent);
}

.sort-arrow {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 5px;
    vertical-align: middle;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-bottom: 5px solid currentColor;
    opacity: 0.3;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

thead th.sortable:hover .sort-arrow {
    opacity: 0.6;
}

thead th.sortable.sort-asc .sort-arrow {
    opacity: 1;
    border-bottom: 5px solid var(--accent);
    transform: rotate(0deg);
}

thead th.sortable.sort-desc .sort-arrow {
    opacity: 1;
    border-bottom: 5px solid var(--accent);
    transform: rotate(180deg);
}

/* ===== Filter Icon & Popup ===== */
thead th.filterable {
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: color 0.2s ease;
}

thead th.filterable:hover {
    color: var(--accent);
}

.filter-icon {
    display: inline-block;
    margin-left: 4px;
    font-size: 0.65rem;
    opacity: 0.4;
    cursor: pointer;
    transition: opacity 0.2s ease, color 0.2s ease;
    vertical-align: middle;
}

thead th.filterable:hover .filter-icon {
    opacity: 0.8;
}

thead th.filter-active .filter-icon {
    opacity: 1;
    color: var(--accent);
}

thead th.filter-active {
    color: var(--accent);
}

.filter-popup {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    max-width: 280px;
    background: rgba(15, 23, 42, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-sm);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
    padding: 0.75rem;
    z-index: 200;
    animation: filterPopupIn 0.2s ease-out both;
    text-transform: none;
}

[data-theme="light"] .filter-popup {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

@keyframes filterPopupIn {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }

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

.filter-search {
    width: 100%;
    padding: 0.5rem 0.7rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 0.5rem;
}

.filter-search::placeholder {
    color: var(--text-placeholder);
}

.filter-search:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.filter-btn-row {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 0.5rem;
}

.filter-btn-action {
    flex: 1;
    padding: 0.3rem 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--bg-card-border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn-action:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.filter-list {
    max-height: 180px;
    overflow-y: auto;
    margin-bottom: 0.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-card-border) transparent;
}

.filter-list::-webkit-scrollbar {
    width: 4px;
}

.filter-list::-webkit-scrollbar-thumb {
    background: var(--bg-card-border);
    border-radius: 2px;
}

.filter-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.3rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-primary);
    transition: background 0.15s ease;
}

.filter-item:hover {
    background: var(--bg-hover);
}

.filter-item input[type="checkbox"] {
    cursor: pointer;
    width: 1rem;
    height: 1rem;
    accent-color: var(--accent);
    flex-shrink: 0;
}

.filter-btn-apply {
    width: 100%;
    padding: 0.5rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border: none;
    border-radius: 6px;
    color: #fff;
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 3px 10px var(--accent-glow);
}

.filter-btn-apply:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 15px var(--accent-glow);
}

tbody td {
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    border-bottom: 1px solid var(--bg-card-border);
    transition: background var(--transition);
}

[data-theme="light"] tbody td {
    border-bottom-color: rgba(0, 0, 0, 0.08);
}

tbody tr {
    transition: background var(--transition);
    animation: slideInRow 0.3s ease-out both;
}

/* Animation delays */
tbody tr:nth-child(1) {
    animation-delay: 0.05s;
}

tbody tr:nth-child(2) {
    animation-delay: 0.1s;
}

tbody tr:nth-child(3) {
    animation-delay: 0.15s;
}

tbody tr:nth-child(4) {
    animation-delay: 0.2s;
}

tbody tr:nth-child(5) {
    animation-delay: 0.25s;
}

tbody tr:nth-child(n+6) {
    animation-delay: 0.3s;
}

tbody tr:hover {
    background: var(--bg-hover);
}

.loading-row {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem !important;
}

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-admin {
    background: rgba(248, 113, 113, 0.15);
    color: var(--error);
}

.badge-teacher {
    background: rgba(251, 191, 36, 0.15);
    color: var(--warning);
}

.badge-student {
    background: rgba(52, 211, 153, 0.15);
    color: var(--success);
}

.badge-ef {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-hover);
}

/* Classroom Status */
.badge-available {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.badge-unavailable {
    background: rgba(248, 113, 113, 0.15);
    color: var(--error);
}

.status-cell {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
    width: 42px;
    height: 42px;
    border: none;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 100;
    flex-shrink: 0;
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    transition: transform 0.4s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-toggle--fixed {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
}