/**
 * HeuriSight Cohort Modal Styles
 * Styles for the Create/Edit Cohort modal including:
 * - Color picker
 * - Custom checkboxes
 * - Dual-list student selector
 */

/* =============================================================================
   COHORT MODAL
   ============================================================================= */

.cohort-modal {
    max-width: min(720px, 95vw);
}

.cohort-modal .modal-shell__header-content {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4, 16px);
}

.cohort-modal .modal-shell__icon-wrapper {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    border-radius: var(--radius-md, 12px);
    flex-shrink: 0;
}

.cohort-modal .modal-shell__icon-wrapper .cohort-icon {
    width: 22px;
    height: 22px;
    color: var(--accent, #0071E3);
}

.cohort-modal .modal-shell__subtitle {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
    margin-top: var(--space-1, 4px);
}

.cohort-modal .modal-shell__body {
    padding: var(--space-5, 20px) var(--space-6, 24px);
    max-height: calc(90vh - 200px);
    overflow-y: auto;
}

.cohort-modal .modal-shell__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4, 16px);
    padding: var(--space-4, 16px) var(--space-6, 24px);
}

.cohort-modal .modal-shell__footer-actions {
    display: flex;
    gap: var(--space-3, 12px);
}

.cohort-form-section {
    margin-bottom: var(--space-6, 24px);
}

/* =============================================================================
   COLOR PICKER
   ============================================================================= */

.color-picker {
    display: flex;
    gap: var(--space-3, 12px);
    flex-wrap: wrap;
}

.color-picker__option {
    width: 36px;
    height: 36px;
    padding: 3px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm, 8px);
    cursor: pointer;
    transition: transform var(--duration-fast, 150ms) var(--ease-default),
                box-shadow var(--duration-fast, 150ms) var(--ease-default);
    position: relative;
}

.color-picker__option:hover {
    transform: scale(1.1);
}

.color-picker__option:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--bg-primary, #FFFFFF), 0 0 0 4px var(--accent, #0071E3);
}

.color-picker__option--selected {
    box-shadow: 0 0 0 2px var(--bg-primary, #FFFFFF), 0 0 0 4px var(--accent, #0071E3);
}

.color-picker__swatch {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: calc(var(--radius-sm, 8px) - 2px);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* =============================================================================
   CUSTOM CHECKBOXES
   ============================================================================= */

.cohort-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3, 12px);
}

.hs-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3, 12px);
    cursor: pointer;
    position: relative;
    padding: var(--space-3, 12px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
    transition: background var(--duration-fast, 150ms) var(--ease-default);
}

.hs-checkbox:hover {
    background: var(--bg-tertiary, #E8E8ED);
}

.hs-checkbox input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.hs-checkbox__box {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    border: 2px solid var(--border-strong, rgba(0, 0, 0, 0.15));
    border-radius: 5px;
    background: var(--bg-primary, #FFFFFF);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
    margin-top: 1px;
}

.hs-checkbox__box::after {
    content: '';
    width: 10px;
    height: 6px;
    border: 2px solid transparent;
    border-top: none;
    border-right: none;
    transform: rotate(-45deg) scale(0);
    margin-top: -2px;
    transition: transform var(--duration-fast, 150ms) var(--ease-bounce);
}

.hs-checkbox input:checked + .hs-checkbox__box {
    background: var(--accent, #0071E3);
    border-color: var(--accent, #0071E3);
}

.hs-checkbox input:checked + .hs-checkbox__box::after {
    border-color: #FFFFFF;
    transform: rotate(-45deg) scale(1);
}

.hs-checkbox input:focus-visible + .hs-checkbox__box {
    box-shadow: 0 0 0 3px var(--accent-subtle, rgba(0, 113, 227, 0.15));
}

.hs-checkbox__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.hs-checkbox__label {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
}

.hs-checkbox__label .cohort-icon {
    width: 14px;
    height: 14px;
    color: var(--text-tertiary, #86868B);
}

.hs-checkbox__hint {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
}

.hs-checkbox--indent {
    margin-left: var(--space-6, 24px);
}

/* =============================================================================
   DUAL-LIST STUDENT SELECTOR
   ============================================================================= */

.dual-list {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--space-3, 12px);
    margin-top: var(--space-4, 16px);
}

.dual-list__panel {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-md, 12px);
    padding: var(--space-4, 16px);
    display: flex;
    flex-direction: column;
}

.dual-list__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3, 12px);
}

.dual-list__title {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
}

.dual-list__count {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    background: var(--bg-tertiary, #E8E8ED);
    padding: var(--space-1, 4px) var(--space-2, 8px);
    border-radius: var(--radius-full, 9999px);
}

.dual-list__search {
    margin-bottom: var(--space-3, 12px);
}

.dual-list__scroll {
    flex: 1;
    min-height: 200px;
    max-height: 280px;
    overflow-y: auto;
    background: var(--bg-primary, #FFFFFF);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-sm, 8px);
    padding: var(--space-2, 8px);
}

.dual-list__empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 120px;
    color: var(--text-tertiary, #86868B);
    font-size: var(--text-sm, 13px);
}

.dual-list__actions {
    margin-top: var(--space-3, 12px);
}

.dual-list__actions .btn {
    width: 100%;
    justify-content: center;
}

/* Dual-list control buttons */
.dual-list__controls {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2, 8px);
    padding: var(--space-2, 8px) 0;
}

.dual-list__controls .btn {
    width: 40px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dual-list__controls .cohort-icon {
    width: 18px;
    height: 18px;
}

/* Student item in list */
.student-item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    border-radius: var(--radius-sm, 8px);
    cursor: pointer;
    transition: background var(--duration-fast, 150ms) var(--ease-default);
}

.student-item:hover {
    background: var(--bg-secondary, #F5F5F7);
}

.student-item--selected {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
}

.student-item--selected:hover {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.12));
}

.student-item__checkbox {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    border: 2px solid var(--border-default, rgba(0, 0, 0, 0.1));
    border-radius: 4px;
    background: var(--bg-primary, #FFFFFF);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.student-item--selected .student-item__checkbox {
    background: var(--accent, #0071E3);
    border-color: var(--accent, #0071E3);
}

.student-item--selected .student-item__checkbox::after {
    content: '';
    width: 8px;
    height: 5px;
    border: 2px solid #FFFFFF;
    border-top: none;
    border-right: none;
    transform: rotate(-45deg);
    margin-top: -2px;
}

.student-item__info {
    flex: 1;
    min-width: 0;
}

.student-item__name {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.student-item__email {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* =============================================================================
   RESPONSIVE
   ============================================================================= */

@media (max-width: 767px) {
    .dual-list {
        grid-template-columns: 1fr;
        gap: var(--space-4, 16px);
    }
    
    .dual-list__controls {
        flex-direction: row;
        justify-content: center;
        order: 1;
    }
    
    .dual-list__panel:first-child {
        order: 0;
    }
    
    .dual-list__panel:last-child {
        order: 2;
    }
}

/* =============================================================================
   DARK THEME
   ============================================================================= */

[data-theme="dark"] .cohort-modal .modal-shell__icon-wrapper {
    background: rgba(0, 113, 227, 0.15);
}

[data-theme="dark"] .hs-checkbox {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .hs-checkbox:hover {
    background: var(--bg-elevated, #3A3A3C);
}

[data-theme="dark"] .hs-checkbox__box {
    background: var(--bg-secondary, #2C2C2E);
    border-color: var(--border-strong, rgba(255, 255, 255, 0.2));
}

[data-theme="dark"] .hs-checkbox__label {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .dual-list__panel {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .dual-list__title {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .dual-list__count {
    background: var(--bg-elevated, #3A3A3C);
}

[data-theme="dark"] .dual-list__scroll {
    background: var(--bg-secondary, #2C2C2E);
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

[data-theme="dark"] .student-item:hover {
    background: var(--bg-tertiary, #3A3A3C);
}

[data-theme="dark"] .student-item__name {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .student-item__checkbox {
    background: var(--bg-secondary, #2C2C2E);
    border-color: var(--border-default, rgba(255, 255, 255, 0.12));
}

[data-theme="dark"] .color-picker__option--selected,
[data-theme="dark"] .color-picker__option:focus-visible {
    box-shadow: 0 0 0 2px var(--bg-primary, #1C1C1E), 0 0 0 4px var(--accent, #0071E3);
}

/* =============================================================================
   BULK UPLOAD MODAL
   ============================================================================= */

.bulk-upload-modal .modal-shell__icon-wrapper {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    border-radius: var(--radius-md, 12px);
    flex-shrink: 0;
}

.bulk-upload-modal .modal-shell__icon-wrapper .cohort-icon {
    width: 22px;
    height: 22px;
    color: var(--accent, #0071E3);
}

.bulk-upload-modal .modal-shell__header-content {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4, 16px);
}

/* CSV Format Hint */
.csv-format-hint {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
    padding: var(--space-4, 16px);
    margin-bottom: var(--space-5, 20px);
}

.csv-format-hint__title {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin-bottom: var(--space-3, 12px);
}

.csv-format-hint__icon {
    width: 16px;
    height: 16px;
    color: var(--accent, #0071E3);
}

.csv-format-hint__code {
    font-family: var(--font-mono, monospace);
    font-size: var(--text-xs, 11px);
    color: var(--text-secondary, #6E6E73);
    background: var(--bg-primary, #FFFFFF);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-sm, 8px);
    padding: var(--space-3, 12px);
    margin: 0;
    overflow-x: auto;
    white-space: pre;
}

/* File Upload */
.file-upload {
    position: relative;
}

.file-upload__input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.file-upload__label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2, 8px);
    padding: var(--space-6, 24px);
    background: var(--bg-secondary, #F5F5F7);
    border: 2px dashed var(--border-default, rgba(0, 0, 0, 0.1));
    border-radius: var(--radius-md, 12px);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.file-upload__label:hover {
    background: var(--bg-tertiary, #E8E8ED);
    border-color: var(--accent, #0071E3);
}

.file-upload__input:focus + .file-upload__label {
    border-color: var(--accent, #0071E3);
    box-shadow: 0 0 0 3px var(--accent-subtle, rgba(0, 113, 227, 0.15));
}

.file-upload__icon {
    width: 32px;
    height: 32px;
    color: var(--text-tertiary, #86868B);
}

.file-upload__text {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
}

.file-upload__filename {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
}

.file-upload__filename--has-file {
    color: var(--accent, #0071E3);
    font-weight: 500;
}

/* Bulk Upload Progress */
.bulk-upload-progress {
    margin-top: var(--space-5, 20px);
    padding: var(--space-4, 16px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
}

.bulk-upload-progress__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2, 8px);
}

.bulk-upload-progress__label {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
}

.bulk-upload-progress__percent {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--accent, #0071E3);
}

.bulk-upload-progress__text {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin: var(--space-2, 8px) 0 0;
}

/* Bulk Upload Results */
.bulk-upload-results {
    margin-top: var(--space-5, 20px);
}

.bulk-upload-results__card {
    padding: var(--space-4, 16px);
    border-radius: var(--radius-sm, 8px);
}

.bulk-upload-results__card--success {
    background: var(--success-subtle, rgba(52, 199, 89, 0.1));
}

.bulk-upload-results__card--error {
    background: var(--destructive-subtle, rgba(255, 59, 48, 0.1));
}

.bulk-upload-results__title {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    margin-bottom: var(--space-2, 8px);
}

.bulk-upload-results__title--success {
    color: var(--success, #34C759);
}

.bulk-upload-results__title--error {
    color: var(--destructive, #FF3B30);
}

.bulk-upload-results__content {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
}

/* Dark theme */
[data-theme="dark"] .csv-format-hint {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .csv-format-hint__code {
    background: var(--bg-secondary, #1C1C1E);
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
    color: var(--text-secondary, #A1A1A6);
}

[data-theme="dark"] .file-upload__label {
    background: var(--bg-tertiary, #2C2C2E);
    border-color: var(--border-default, rgba(255, 255, 255, 0.12));
}

[data-theme="dark"] .file-upload__label:hover {
    background: var(--bg-elevated, #3A3A3C);
}

[data-theme="dark"] .bulk-upload-progress {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .bulk-upload-progress__label {
    color: var(--text-primary, #F5F5F7);
}

/* =============================================================================
   INSTRUCTOR CARDS
   ============================================================================= */

.instructor-card {
    background: var(--bg-primary, #FFFFFF);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-md, 12px);
    padding: var(--space-5, 20px);
    margin-bottom: var(--space-4, 16px);
    transition: box-shadow var(--duration-fast, 150ms) var(--ease-default);
}

.instructor-card:hover {
    box-shadow: var(--shadow-md);
}

.instructor-card__content {
    display: flex;
    align-items: center;
    gap: var(--space-5, 20px);
}

.instructor-card__avatar {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md, 12px);
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.instructor-card__avatar-icon {
    width: 28px;
    height: 28px;
    color: var(--accent, #0071E3);
}

.instructor-card__info {
    flex: 1;
    min-width: 0;
}

.instructor-card__name {
    font-size: var(--text-base, 15px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin-bottom: var(--space-1, 4px);
}

.instructor-card__meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.instructor-card__meta-item {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
}

.instructor-card__stats {
    text-align: center;
    padding: var(--space-3, 12px) var(--space-4, 16px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
    min-width: 80px;
}

.instructor-card__stats-value {
    font-size: var(--text-xl, 20px);
    font-weight: 700;
    color: var(--accent, #0071E3);
}

.instructor-card__stats-label {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.instructor-card__actions {
    display: flex;
    gap: var(--space-2, 8px);
}

.instructor-card__cohorts {
    margin-top: var(--space-4, 16px);
    padding-top: var(--space-4, 16px);
    border-top: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
}

.instructor-card__cohorts-label {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin-bottom: var(--space-2, 8px);
}

.instructor-card__cohort-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2, 8px);
}

.instructor-card__cohort-tag {
    font-size: var(--text-xs, 11px);
    font-weight: 500;
    color: var(--accent, #0071E3);
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    padding: var(--space-1, 4px) var(--space-3, 12px);
    border-radius: var(--radius-full, 9999px);
}

/* Dark theme */
[data-theme="dark"] .instructor-card {
    background: var(--bg-secondary, #2C2C2E);
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

[data-theme="dark"] .instructor-card__name {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .instructor-card__avatar {
    background: rgba(0, 113, 227, 0.15);
}

[data-theme="dark"] .instructor-card__stats {
    background: var(--bg-tertiary, #3A3A3C);
}

[data-theme="dark"] .instructor-card__cohorts {
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

[data-theme="dark"] .instructor-card__cohort-tag {
    background: rgba(0, 113, 227, 0.15);
}

/* =============================================================================
   INSTRUCTOR CARDS - MOBILE RESPONSIVE
   ============================================================================= */

@media (max-width: 768px) {
    .instructor-card {
        padding: var(--space-4, 16px);
    }

    .instructor-card__content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3, 12px);
    }

    .instructor-card__avatar {
        width: 48px;
        height: 48px;
    }

    .instructor-card__info {
        width: 100%;
    }

    .instructor-card__name {
        font-size: var(--text-base, 15px);
    }

    .instructor-card__meta {
        flex-direction: column;
        gap: var(--space-1, 4px);
    }

    .instructor-card__stats {
        width: 100%;
        display: flex;
        align-items: center;
        gap: var(--space-3, 12px);
        padding: var(--space-2, 8px) var(--space-3, 12px);
    }

    .instructor-card__stats-value {
        font-size: var(--text-lg, 17px);
    }

    .instructor-card__stats-label {
        margin: 0;
    }

    .instructor-card__actions {
        width: 100%;
        flex-direction: column;
    }

    .instructor-card__actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* =============================================================================
   INSTRUCTOR ICONS
   ============================================================================= */

.instructor-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.instructor-card__avatar .instructor-icon {
    width: 28px;
    height: 28px;
}

/* Button icons */
.btn .instructor-icon {
    width: 14px;
    height: 14px;
    margin-right: var(--space-1, 4px);
}

/* Modal header icons */
.modal-shell__icon-wrapper .instructor-icon {
    width: 22px;
    height: 22px;
    color: var(--accent, #0071E3);
}

.modal-shell__icon-wrapper--accent {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    border-radius: var(--radius-md, 12px);
    flex-shrink: 0;
}

/* Checkbox icon */
.hs-checkbox__label .instructor-icon {
    width: 14px;
    height: 14px;
    color: var(--text-tertiary, #86868B);
}

/* =============================================================================
   DETAIL SECTION (for modals)
   ============================================================================= */

.detail-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-4, 16px);
}

.detail-section__item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.detail-section__label {
    font-size: var(--text-xs, 11px);
    font-weight: 500;
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.detail-section__value {
    font-size: var(--text-base, 15px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
}

[data-theme="dark"] .detail-section__value {
    color: var(--text-primary, #F5F5F7);
}

/* =============================================================================
   EMPTY STATE
   ============================================================================= */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-12, 48px) var(--space-6, 24px);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-lg, 16px);
    margin-bottom: var(--space-4, 16px);
}

.empty-state-icon .instructor-icon,
.empty-state-icon .cohort-icon {
    width: 32px;
    height: 32px;
    color: var(--text-tertiary, #86868B);
}

.empty-state-title {
    font-size: var(--text-lg, 17px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin-bottom: var(--space-2, 8px);
}

.empty-state-text {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
    max-width: 300px;
    margin-bottom: var(--space-6, 24px);
}

[data-theme="dark"] .empty-state-icon {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .empty-state-title {
    color: var(--text-primary, #F5F5F7);
}

/* =============================================================================
   COHORT INFO CARD (for assignment modal)
   ============================================================================= */

.cohort-info-card {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-md, 12px);
    padding: var(--space-4, 16px);
    margin-bottom: var(--space-5, 20px);
}

.cohort-info-card__header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4, 16px);
}

.cohort-info-card__icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-sm, 8px);
    flex-shrink: 0;
}

.cohort-info-card__icon .cohort-icon {
    width: 20px;
    height: 20px;
    color: var(--accent, #0071E3);
}

.cohort-info-card__content {
    flex: 1;
    min-width: 0;
}

.cohort-info-card__name {
    font-size: var(--text-base, 15px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin-bottom: var(--space-1, 4px);
}

.cohort-info-card__meta {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
}

/* =============================================================================
   ASSIGNMENT SECTION
   ============================================================================= */

.assignment-section {
    margin-bottom: var(--space-5, 20px);
}

.assignment-section:last-child {
    margin-bottom: 0;
}

.assignment-section__title {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin: 0 0 var(--space-3, 12px);
}

.assignment-section__title .cohort-icon,
.assignment-section__icon {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary, #86868B);
}

/* =============================================================================
   INSTRUCTOR LIST (for assignment modal)
   ============================================================================= */

.instructor-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2, 8px);
}

.instructor-list--scrollable {
    max-height: 280px;
    overflow-y: auto;
    padding-right: var(--space-1, 4px);
}

.instructor-list__item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-3, 12px) var(--space-4, 16px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
    transition: background var(--duration-fast, 150ms) var(--ease-default);
}

.instructor-list__item:hover {
    background: var(--bg-tertiary, #E8E8ED);
}

.instructor-list__item--assigned {
    background: var(--success-subtle, rgba(52, 199, 89, 0.1));
}

.instructor-list__item--assigned:hover {
    background: rgba(52, 199, 89, 0.15);
}

.instructor-list__avatar {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-sm, 8px);
    flex-shrink: 0;
}

.instructor-list__avatar .cohort-icon {
    width: 20px;
    height: 20px;
    color: var(--accent, #0071E3);
}

.instructor-list__info {
    flex: 1;
    min-width: 0;
}

.instructor-list__name {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
}

.instructor-list__email {
    font-size: var(--text-xs, 11px);
    color: var(--text-secondary, #6E6E73);
}

.instructor-list__meta {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin-top: var(--space-1, 4px);
}

/* Compact empty state */
.empty-state--compact {
    padding: var(--space-6, 24px);
}

.empty-state--compact .empty-state-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-3, 12px);
}

.empty-state--compact .empty-state-icon .cohort-icon {
    width: 24px;
    height: 24px;
}

/* Dark theme */
[data-theme="dark"] .cohort-info-card {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .cohort-info-card__icon {
    background: var(--bg-secondary, #1C1C1E);
}

[data-theme="dark"] .cohort-info-card__name {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .assignment-section__title {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .instructor-list__item {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .instructor-list__item:hover {
    background: var(--bg-elevated, #3A3A3C);
}

[data-theme="dark"] .instructor-list__item--assigned {
    background: rgba(52, 199, 89, 0.12);
}

[data-theme="dark"] .instructor-list__avatar {
    background: var(--bg-secondary, #1C1C1E);
}

[data-theme="dark"] .instructor-list__name {
    color: var(--text-primary, #F5F5F7);
}

/* =============================================================================
   ASSIGNMENT MODAL
   ============================================================================= */

.assignment-modal {
    max-width: min(640px, 95vw);
}

.assignment-modal .modal-shell__header-content {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4, 16px);
}

.assignment-modal .modal-shell__subtitle {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
    margin-top: var(--space-1, 4px);
}

.assignment-modal .modal-shell__body {
    padding: var(--space-5, 20px) var(--space-6, 24px);
    max-height: calc(90vh - 200px);
    overflow-y: auto;
}

/* Assignment icon sizing */
.assignment-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.modal-shell__icon-wrapper .assignment-icon {
    width: 22px;
    height: 22px;
    color: var(--accent, #0071E3);
}

/* Assignment Info Card */
.assignment-info-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4, 16px);
    padding: var(--space-4, 16px);
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    border-radius: var(--radius-md, 12px);
    margin-bottom: var(--space-5, 20px);
}

.assignment-info-card__icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-sm, 8px);
    flex-shrink: 0;
}

.assignment-info-card__icon .assignment-icon {
    width: 20px;
    height: 20px;
    color: var(--accent, #0071E3);
}

.assignment-info-card__content {
    flex: 1;
    min-width: 0;
}

.assignment-info-card__title {
    font-size: var(--text-base, 15px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin-bottom: var(--space-1, 4px);
}

.assignment-info-card__meta {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
}

/* Form Sections */
.assignment-form-section {
    margin-bottom: var(--space-5, 20px);
}

.assignment-form-label {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2, 8px);
}

.assignment-form-label .assignment-icon {
    width: 14px;
    height: 14px;
    color: var(--text-tertiary, #86868B);
}

.assignment-form-hint {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin-top: var(--space-1, 4px);
}

/* Currently Assigned List */
.assignment-current-list {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
    padding: var(--space-3, 12px);
    border-left: 3px solid var(--warning, #FF9500);
}

.assignment-current-list__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2, 8px);
}

.assignment-loading {
    font-size: var(--text-sm, 13px);
    color: var(--text-tertiary, #86868B);
    padding: var(--space-2, 8px);
}

.assignment-empty {
    font-size: var(--text-sm, 13px);
    color: var(--text-tertiary, #86868B);
    padding: var(--space-3, 12px);
    text-align: center;
}

/* Assigned Items */
.assignment-assigned-item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    padding: var(--space-3, 12px);
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-sm, 8px);
}

.assignment-assigned-item--cohort {
    border-left: 3px solid var(--accent, #0071E3);
}

.assignment-assigned-item__icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
    flex-shrink: 0;
}

.assignment-assigned-item__icon .assignment-icon {
    width: 18px;
    height: 18px;
    color: var(--accent, #0071E3);
}

.assignment-assigned-item__content {
    flex: 1;
    min-width: 0;
}

.assignment-assigned-item__name {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
}

.assignment-assigned-item__meta {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin-top: var(--space-1, 4px);
}

.assignment-section-label {
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: var(--space-4, 16px) 0 var(--space-2, 8px);
}

/* Status badges */
.assignment-status {
    font-weight: 500;
}

.assignment-status--success {
    color: var(--success, #34C759);
}

.assignment-status--info {
    color: var(--accent, #0071E3);
}

.assignment-status--warning {
    color: var(--warning, #FF9500);
}

.assignment-status--danger {
    color: var(--destructive, #FF3B30);
}

.assignment-status--muted {
    color: var(--text-tertiary, #86868B);
}

/* Assignment Type Options (Radio Buttons) */
.assignment-type-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3, 12px);
}

.assignment-type-option {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3, 12px);
    padding: var(--space-4, 16px);
    background: var(--bg-secondary, #F5F5F7);
    border: 2px solid transparent;
    border-radius: var(--radius-md, 12px);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.assignment-type-option:hover {
    background: var(--bg-tertiary, #E8E8ED);
}

.assignment-type-option--selected {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    border-color: var(--accent, #0071E3);
}

.assignment-type-option input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.assignment-type-option__radio {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    border: 2px solid var(--border-strong, rgba(0, 0, 0, 0.15));
    border-radius: 50%;
    background: var(--bg-primary, #FFFFFF);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
    margin-top: 2px;
}

.assignment-type-option--selected .assignment-type-option__radio {
    border-color: var(--accent, #0071E3);
}

.assignment-type-option--selected .assignment-type-option__radio::after {
    content: '';
    width: 10px;
    height: 10px;
    background: var(--accent, #0071E3);
    border-radius: 50%;
}

.assignment-type-option__content {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3, 12px);
    flex: 1;
}

.assignment-type-option__icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-sm, 8px);
    flex-shrink: 0;
}

.assignment-type-option__icon .assignment-icon {
    width: 20px;
    height: 20px;
    color: var(--text-secondary, #6E6E73);
}

.assignment-type-option--selected .assignment-type-option__icon {
    background: var(--accent, #0071E3);
}

.assignment-type-option--selected .assignment-type-option__icon .assignment-icon {
    color: #FFFFFF;
}

.assignment-type-option__text {
    flex: 1;
}

.assignment-type-option__title {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin-bottom: var(--space-1, 4px);
}

.assignment-type-option__meta {
    font-size: var(--text-xs, 11px);
    color: var(--text-secondary, #6E6E73);
}

/* Search Input */
.assignment-search {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    background: var(--bg-secondary, #F5F5F7);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-sm, 8px);
    margin-bottom: var(--space-3, 12px);
}

.assignment-search .assignment-icon {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary, #86868B);
}

.assignment-search__input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: var(--text-sm, 13px);
    color: var(--text-primary, #1D1D1F);
    outline: none;
}

.assignment-search__input::placeholder {
    color: var(--text-tertiary, #86868B);
}

/* Student List */
.assignment-student-list {
    background: var(--bg-secondary, #F5F5F7);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-md, 12px);
    overflow: hidden;
}

.assignment-student-list__scroll {
    max-height: 240px;
    overflow-y: auto;
    padding: var(--space-2, 8px);
}

/* Preview Section */
.assignment-preview {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-md, 12px);
    padding: var(--space-4, 16px);
    border-left: 3px solid var(--accent, #0071E3);
}

.assignment-preview__header {
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3, 12px);
}

.assignment-preview__content {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
}

.assignment-preview__empty {
    color: var(--text-tertiary, #86868B);
    font-style: italic;
}

.assignment-preview__items {
    display: flex;
    flex-direction: column;
    gap: var(--space-3, 12px);
}

.assignment-preview__item {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
}

.assignment-preview__icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-sm, 8px);
}

.assignment-preview__icon .assignment-icon {
    width: 16px;
    height: 16px;
    color: var(--text-secondary, #6E6E73);
}

.assignment-preview__icon--accent {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.1));
}

.assignment-preview__icon--accent .assignment-icon {
    color: var(--accent, #0071E3);
}

.assignment-preview__text {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
}

.assignment-preview__text strong {
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
}

/* Button with icon */
.btn .assignment-icon {
    width: 14px;
    height: 14px;
    margin-right: var(--space-1, 4px);
}

/* Button spinner */
.btn-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #FFFFFF;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: var(--space-2, 8px);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* =============================================================================
   ASSIGNMENT MODAL - DARK THEME
   ============================================================================= */

[data-theme="dark"] .assignment-info-card {
    background: rgba(0, 113, 227, 0.12);
}

[data-theme="dark"] .assignment-info-card__icon {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .assignment-info-card__title {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .assignment-current-list {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .assignment-assigned-item {
    background: var(--bg-secondary, #1C1C1E);
}

[data-theme="dark"] .assignment-assigned-item__icon {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .assignment-assigned-item__name {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .assignment-type-option {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .assignment-type-option:hover {
    background: var(--bg-elevated, #3A3A3C);
}

[data-theme="dark"] .assignment-type-option--selected {
    background: rgba(0, 113, 227, 0.15);
}

[data-theme="dark"] .assignment-type-option__radio {
    background: var(--bg-secondary, #1C1C1E);
    border-color: var(--border-strong, rgba(255, 255, 255, 0.2));
}

[data-theme="dark"] .assignment-type-option__icon {
    background: var(--bg-secondary, #1C1C1E);
}

[data-theme="dark"] .assignment-type-option__title {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .assignment-search {
    background: var(--bg-tertiary, #2C2C2E);
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

[data-theme="dark"] .assignment-search__input {
    color: var(--text-primary, #F5F5F7);
}

[data-theme="dark"] .assignment-student-list {
    background: var(--bg-tertiary, #2C2C2E);
    border-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

[data-theme="dark"] .assignment-preview {
    background: var(--bg-tertiary, #2C2C2E);
}

[data-theme="dark"] .assignment-preview__icon {
    background: var(--bg-secondary, #1C1C1E);
}

[data-theme="dark"] .assignment-preview__icon--accent {
    background: rgba(0, 113, 227, 0.15);
}

[data-theme="dark"] .assignment-preview__text strong {
    color: var(--text-primary, #F5F5F7);
}

/* =============================================================================
   ASSIGNMENT MODAL - RESPONSIVE
   ============================================================================= */

@media (max-width: 480px) {
    .assignment-type-option__content {
        flex-direction: column;
        gap: var(--space-2, 8px);
    }
    
    .assignment-type-option__icon {
        width: 32px;
        height: 32px;
    }
    
    .assignment-type-option__icon .assignment-icon {
        width: 16px;
        height: 16px;
    }
}