/**
 * Instructor Dashboard Styles
 * Following Apple HIG: Clarity, Deference, Depth
 * Based on: mockups/apple-redesign/DESIGN_SYSTEM.md
 */

/* =============================================================================
   DASHBOARD OVERLAY & CONTAINER
   ============================================================================= */

.dashboard-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay, 9000);
    background: var(--bg-primary, #FFFFFF);
    overflow-y: auto;
}

.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-6, 24px);
    min-height: 100vh;
}

/* =============================================================================
   DASHBOARD HEADER
   ============================================================================= */

.dashboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6, 24px);
    padding-bottom: var(--space-4, 16px);
    border-bottom: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
}

.dashboard-header__left {
    display: flex;
    align-items: center;
    gap: var(--space-4, 16px);
}

.dashboard-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl, 24px);
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary, #1D1D1F);
    margin: 0;
}

.role-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1, 4px) var(--space-3, 12px);
    background: var(--bg-tertiary, #E8E8ED);
    border-radius: var(--radius-full, 9999px);
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    color: var(--text-secondary, #6E6E73);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* =============================================================================
   DASHBOARD NAVIGATION
   ============================================================================= */

.dashboard-nav {
    display: flex;
    gap: var(--space-1, 4px);
    padding: var(--space-1, 4px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-md, 12px);
    margin-bottom: var(--space-6, 24px);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.nav-tab {
    padding: var(--space-2, 8px) var(--space-5, 20px);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm, 8px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.nav-tab:hover {
    color: var(--text-primary, #1D1D1F);
}

.nav-tab--active {
    background: var(--bg-primary, #FFFFFF);
    color: var(--text-primary, #1D1D1F);
    box-shadow: var(--shadow-sm, 0 1px 2px rgba(0, 0, 0, 0.04));
}

/* =============================================================================
   DASHBOARD CONTENT
   ============================================================================= */

.dashboard-content {
    min-height: 400px;
}

/* =============================================================================
   COHORTS GRID
   ============================================================================= */

.cohorts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-4, 16px);
}

/* =============================================================================
   COHORT CARD
   ============================================================================= */

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

.cohort-card:hover {
    box-shadow: var(--shadow-md, 0 4px 16px rgba(0, 0, 0, 0.08));
}

.cohort-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4, 16px);
    margin-bottom: var(--space-4, 16px);
}

.cohort-card__title-group {
    flex: 1;
    min-width: 0;
}

.cohort-card__title {
    font-size: var(--text-lg, 17px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    letter-spacing: -0.01em;
    margin: 0 0 var(--space-1, 4px) 0;
}

.cohort-card__description {
    font-size: var(--text-sm, 13px);
    color: var(--text-secondary, #6E6E73);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cohort-card__count {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    flex-shrink: 0;
}

.cohort-card__count-value {
    font-size: var(--text-2xl, 24px);
    font-weight: 700;
    color: var(--text-primary, #1D1D1F);
    letter-spacing: -0.02em;
    line-height: 1;
}

.cohort-card__count-label {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.cohort-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2, 8px);
    margin-bottom: var(--space-4, 16px);
}

.cohort-card__actions {
    display: flex;
    gap: var(--space-2, 8px);
    padding-top: var(--space-4, 16px);
    border-top: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
}

/* =============================================================================
   META TAGS
   ============================================================================= */

.meta-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1, 4px);
    padding: var(--space-1, 4px) var(--space-2, 8px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 6px);
    font-size: var(--text-xs, 11px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
}

.meta-tag--success {
    background: var(--success-subtle, rgba(52, 199, 89, 0.1));
    color: var(--success, #34C759);
}

.meta-tag--warning {
    background: var(--warning-subtle, rgba(255, 149, 0, 0.1));
    color: var(--warning, #FF9500);
}

.meta-tag--muted {
    background: var(--bg-tertiary, #E8E8ED);
    color: var(--text-tertiary, #86868B);
}

/* =============================================================================
   STATUS DOTS
   ============================================================================= */

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-dot--success {
    background: var(--success, #34C759);
}

.status-dot--warning {
    background: var(--warning, #FF9500);
}

.status-dot--danger {
    background: var(--destructive, #FF3B30);
}

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

.status-dot--muted {
    background: var(--gray-400, #86868B);
}

/* =============================================================================
   GHOST BUTTONS
   ============================================================================= */

.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2, 8px);
    padding: var(--space-2, 8px) var(--space-3, 12px);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm, 8px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-secondary, #6E6E73);
    cursor: pointer;
    transition: all var(--duration-fast, 150ms) var(--ease-default);
}

.btn-ghost:hover {
    background: var(--bg-secondary, #F5F5F7);
    color: var(--text-primary, #1D1D1F);
}

.btn-ghost--primary {
    color: var(--accent, #0071E3);
}

.btn-ghost--primary:hover {
    background: var(--accent-subtle, rgba(0, 113, 227, 0.08));
    color: var(--accent, #0071E3);
}

/* =============================================================================
   SVG ICONS
   ============================================================================= */

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

.icon--lg {
    width: 20px;
    height: 20px;
}

/* =============================================================================
   STUDENTS GRID
   ============================================================================= */

.students-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--space-4, 16px);
}

/* =============================================================================
   STUDENT CARD
   ============================================================================= */

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

.student-card:hover {
    box-shadow: var(--shadow-md, 0 4px 16px rgba(0, 0, 0, 0.08));
}

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

.student-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4, 16px);
}

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

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

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

.student-card__progress {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-md, 12px);
    padding: var(--space-4, 16px);
    margin-bottom: var(--space-4, 16px);
}

.student-card__empty {
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-md, 12px);
    padding: var(--space-4, 16px);
    margin-bottom: var(--space-4, 16px);
    font-size: var(--text-sm, 13px);
    color: var(--text-tertiary, #86868B);
    text-align: center;
}

.student-card__pending-state {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3, 12px);
    background: var(--bg-primary, #FFFFFF);
    border-radius: var(--radius-md, 12px);
    padding: var(--space-4, 16px);
    margin-bottom: var(--space-4, 16px);
}

.pending-icon {
    color: var(--text-tertiary, #86868B);
    flex-shrink: 0;
}

.pending-content {
    flex: 1;
}

.pending-title {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    margin: 0 0 var(--space-1, 4px) 0;
}

.pending-description {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    margin: 0;
}

.student-card__actions {
    display: flex;
    gap: var(--space-2, 8px);
    padding-top: var(--space-4, 16px);
    border-top: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
}

/* =============================================================================
   PROGRESS COMPONENTS
   ============================================================================= */

.progress-header {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    margin-bottom: var(--space-3, 12px);
}

.progress-label {
    font-size: var(--text-xs, 11px);
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.sparkline {
    font-family: var(--font-mono, monospace);
    font-size: var(--text-lg, 17px);
    letter-spacing: 0.05em;
    color: var(--success, #34C759);
}

.progress-value {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--success, #34C759);
    margin-left: auto;
}

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

.competency-row {
    display: flex;
    align-items: baseline;
    gap: var(--space-2, 8px);
}

.competency-label {
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    flex-shrink: 0;
    min-width: 80px;
}

.competency-label--success {
    color: var(--success, #34C759);
}

.competency-label--warning {
    color: var(--warning, #FF9500);
}

.competency-value {
    font-size: var(--text-sm, 13px);
    color: var(--text-primary, #1D1D1F);
}

/* =============================================================================
   VIEW CONTAINER & CONTROLS
   ============================================================================= */

.view-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-6, 24px);
}

.view-controls {
    display: flex;
    gap: var(--space-4, 16px);
    align-items: flex-end;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2, 8px);
    min-width: 280px;
}

.form-label {
    font-size: var(--text-xs, 11px);
    font-weight: 600;
    color: var(--text-tertiary, #86868B);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

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

.form-label-row .form-label {
    margin-bottom: 0;
}

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

.form-required {
    color: var(--destructive, #FF3B30);
}

.form-control--mono {
    font-family: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, Monaco, monospace;
    font-size: var(--text-sm, 13px);
}

.attachment-list {
    margin-top: var(--space-2, 8px);
    display: flex;
    flex-direction: column;
    gap: var(--space-1, 4px);
}

.attachment-list .attachment-item {
    display: flex;
    align-items: center;
    gap: var(--space-2, 8px);
    font-size: var(--text-xs, 11px);
    color: var(--text-secondary, #6E6E73);
    padding: var(--space-1, 4px) var(--space-2, 8px);
    background: var(--bg-tertiary, #FAFAFA);
    border-radius: var(--radius-sm, 6px);
}

.select-control {
    padding: var(--space-2, 8px) var(--space-4, 16px);
    background: var(--bg-primary, #FFFFFF);
    border: 1px solid var(--border-default, rgba(0, 0, 0, 0.1));
    border-radius: var(--radius-sm, 8px);
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    cursor: pointer;
    transition: border-color var(--duration-fast, 150ms);
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%2386868B' viewBox='0 0 24 24'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3, 12px) center;
    padding-right: var(--space-10, 40px);
}

.select-control:hover {
    border-color: var(--border-strong, rgba(0, 0, 0, 0.15));
}

.select-control:focus {
    outline: none;
    border-color: var(--accent, #0071E3);
    box-shadow: 0 0 0 3px var(--accent-subtle, rgba(0, 113, 227, 0.08));
}

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

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12, 48px) var(--space-6, 24px);
    text-align: center;
    color: var(--text-tertiary, #86868B);
    font-size: var(--text-sm, 13px);
}

.empty-state p {
    margin: 0;
}

/* =============================================================================
   ANALYTICS COMPONENTS
   ============================================================================= */

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4, 16px);
    margin-bottom: var(--space-6, 24px);
}

.analytics-section {
    background: var(--bg-primary, #FFFFFF);
    border: 1px solid var(--border-light, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-lg, 16px);
    padding: var(--space-5, 20px);
    margin-bottom: var(--space-4, 16px);
}

.analytics-section--alert {
    border-left: 3px solid var(--warning, #FF9500);
}

.analytics-section__header {
    display: flex;
    align-items: center;
    gap: var(--space-3, 12px);
    margin-bottom: var(--space-4, 16px);
}

.analytics-section__title {
    font-size: var(--text-base, 15px);
    font-weight: 600;
    color: var(--text-primary, #1D1D1F);
    margin: 0;
}

.analytics-icon {
    color: var(--text-tertiary, #86868B);
}

.analytics-icon--warning {
    color: var(--warning, #FF9500);
}

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

.analytics-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3, 12px);
    padding: var(--space-3, 12px);
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-sm, 8px);
}

.analytics-list-item__name {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.analytics-list-item__stats {
    display: flex;
    gap: var(--space-2, 8px);
    flex-shrink: 0;
}

.btn-expand {
    width: 100%;
    margin-top: var(--space-3, 12px);
    justify-content: center;
}

/* =============================================================================
   LEARNING PATTERNS
   ============================================================================= */

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

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

.pattern-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pattern-name {
    font-size: var(--text-sm, 13px);
    font-weight: 500;
    color: var(--text-primary, #1D1D1F);
    text-transform: capitalize;
}

.pattern-value {
    font-size: var(--text-sm, 13px);
    font-weight: 600;
    color: var(--text-secondary, #6E6E73);
    font-family: var(--font-mono, monospace);
}

.pattern-bar {
    height: 6px;
    background: var(--bg-secondary, #F5F5F7);
    border-radius: var(--radius-full, 9999px);
    overflow: hidden;
}

.pattern-bar__fill {
    height: 100%;
    border-radius: var(--radius-full, 9999px);
    transition: width var(--duration-normal, 250ms) var(--ease-default);
}

/* =============================================================================
   MODAL COMPONENTS
   ============================================================================= */

.modal-close-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary, #F5F5F7);
    border: none;
    border-radius: var(--radius-full, 9999px);
    cursor: pointer;
    transition: background var(--duration-fast, 150ms);
    flex-shrink: 0;
}

.modal-close-btn:hover {
    background: var(--gray-200, #E8E8ED);
}

.modal-close-btn .icon {
    color: var(--text-secondary, #6E6E73);
}

.success-check-icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-3, 12px);
}

.success-check-icon .icon {
    width: 32px;
    height: 32px;
    color: var(--success, #34C759);
}

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

[data-theme="dark"] .dashboard-overlay {
    background: var(--bg-primary, #1C1C1E);
}

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

[data-theme="dark"] .dashboard-nav {
    background: var(--bg-secondary, #2C2C2E);
}

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

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

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

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

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

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

[data-theme="dark"] .select-control {
    background-color: var(--bg-secondary, #2C2C2E);
    border-color: var(--border-default, rgba(255, 255, 255, 0.12));
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%23A1A1A6' viewBox='0 0 24 24'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
}

[data-theme="dark"] .cohort-card__actions,
[data-theme="dark"] .student-card__actions {
    border-top-color: var(--border-light, rgba(255, 255, 255, 0.08));
}

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

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

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

[data-theme="dark"] .modal-close-btn:hover {
    background: var(--gray-600, #515154);
}

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

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

@media (max-width: 767px) {
    .dashboard-container {
        padding: var(--space-4, 16px);
    }
    
    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3, 12px);
    }
    
    .dashboard-header__left {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2, 8px);
    }
    
    .cohorts-grid,
    .students-grid {
        grid-template-columns: 1fr;
    }
    
    .view-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .form-group {
        min-width: 100%;
    }
    
    .cohort-card__header,
    .student-card__header {
        flex-direction: column;
        gap: var(--space-3, 12px);
    }
    
    .cohort-card__count {
        align-items: flex-start;
        flex-direction: row;
        gap: var(--space-2, 8px);
    }
    
    .cohort-card__actions,
    .student-card__actions {
        flex-direction: column;
    }
    
    .btn-ghost {
        justify-content: center;
    }
}