/* Custom Utility Classes Using Design Tokens */

/* Suppress browser focus ring on headings (caused by Blazor FocusOnNavigate) */
h1:focus, h2:focus, h3:focus, h4:focus, h5:focus, h6:focus {
    outline: none;
}

/* Spacing Utilities - Reduced from defaults */
.compact-spacing {
    --spacing-scale: 0.75; /* 75% of design token spacing */
}

/* Card Styles */
.card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-4);
}

.card-header {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--color-border-secondary);
}

.card-body {
    padding: var(--spacing-4);
}

/* Metrics Card */
.metric-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-4);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    transition: all var(--duration-fast) var(--easing-standard);
}

.metric-card-clickable {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.metric-card-clickable:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-400);
}

.metric-card-clickable:active {
    transform: translateY(0);
}

.metric-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-md);
    flex-shrink: 0;
}

.metric-card-content {
    flex: 1;
    min-width: 0;
}

.metric-card-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-1);
}

.metric-card-value {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    font-family: var(--font-family-mono);
}

.metric-card-subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-1);
}

/* Compact Metric Card */
.metric-card-sm {
    padding: var(--spacing-3);
    gap: var(--spacing-2);
}

.metric-card-sm .metric-card-icon {
    width: 36px;
    height: 36px;
}

.metric-card-sm .metric-card-value {
    font-size: var(--font-size-xl);
}

.metric-card-sm .metric-card-title {
    font-size: var(--font-size-xs);
    margin-bottom: 0;
}

/* Class List Item */
.class-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-3);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-md);
    transition: background-color var(--transition-fast);
}

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

.class-item-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-1);
}

.class-item-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.class-item-meta {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-1);
}

/* Student Avatar List */
.student-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-2) 0;
}

.student-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
    color: white;
    flex-shrink: 0;
}

.student-info-name {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.student-info-class {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Page Header */
.page-header {
    margin-bottom: var(--spacing-6);
}

.page-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2);
}

.page-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

/* Grid System - Tighter spacing */
.grid-compact {
    display: grid;
    gap: var(--spacing-4);
}

.grid-compact-sm {
    display: grid;
    gap: var(--spacing-3);
}

@media (min-width: 1024px) {
    .grid-compact {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .grid-2-col {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ── Shared Button Hover Contrast (Bugs #82/#83) ─────────────── */

/* Primary buttons — teal background */
.btn-primary:hover,
button.btn-primary:hover:not(:disabled),
a.btn-primary:hover {
    background-color: var(--color-teal-600);
    border-color: var(--color-teal-600);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 155, 142, 0.35);
}

/* Success buttons — green background */
.btn-success:hover,
button.btn-success:hover:not(:disabled),
a.btn-success:hover {
    background-color: #15803d;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.30);
}

/* Danger buttons — red background */
.btn-danger:hover,
button.btn-danger:hover:not(:disabled),
a.btn-danger:hover {
    background-color: #b91c1c;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.30);
}

/* Warning buttons — amber/orange background */
.btn-warning:hover,
button.btn-warning:hover:not(:disabled),
a.btn-warning:hover {
    background-color: #b45309;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(217, 119, 6, 0.25);
}

/* Info buttons — cyan/teal background */
.btn-info:hover,
button.btn-info:hover:not(:disabled),
a.btn-info:hover {
    background-color: #0e7490;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(8, 145, 178, 0.25);
}

/* Secondary/outline buttons — white bg with border */
.btn-secondary:hover,
button.btn-secondary:hover:not(:disabled),
a.btn-secondary:hover {
    background-color: var(--color-teal-50);
    border-color: var(--color-teal-500);
    color: var(--color-teal-600);
    transform: translateY(-1px);
}

/* Ghost buttons — transparent bg */
.btn-ghost:hover,
button.btn-ghost:hover:not(:disabled),
a.btn-ghost:hover {
    background-color: var(--color-gray-50);
    color: var(--color-text-primary);
}

/* Teacher module specific hover — slightly stronger for action buttons */
.teacher-module .btn-primary:hover,
.teacher-module button.btn-primary:hover:not(:disabled) {
    background-color: var(--color-teal-700);
    border-color: var(--color-teal-700);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 155, 142, 0.40);
}

.teacher-module .btn-success:hover,
.teacher-module button.btn-success:hover:not(:disabled) {
    background-color: #15803d;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.35);
}

.teacher-module .btn-danger:hover,
.teacher-module button.btn-danger:hover:not(:disabled) {
    background-color: #b91c1c;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.35);
}

.teacher-module .btn-secondary:hover,
.teacher-module button.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-teal-100);
    border-color: var(--color-teal-600);
    color: var(--color-teal-700);
}

/* Disabled state — no hover effects */
.btn-primary:disabled,
.btn-success:disabled,
.btn-danger:disabled,
.btn-warning:disabled,
.btn-info:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Focus ring for accessibility */
.btn:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-teal-400);
    outline-offset: 2px;
}

/* Link Styles */
.link-primary {
    color: var(--color-text-link);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.link-primary:hover {
    color: var(--color-text-link-hover);
}

/* Button Styles */
.btn-link {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-link);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.btn-link:hover {
    color: var(--color-text-link-hover);
}

/* Loading State */
.loading-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 256px;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--color-border-primary);
    border-top-color: var(--color-primary-600);
    border-radius: var(--border-radius-full);
    animation: spin var(--transition-base) linear infinite;
}

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

.loading-text {
    margin-top: var(--spacing-4);
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

/* Error State */
.error-container {
    background-color: var(--color-status-error-light);
    border: 1px solid var(--color-status-error);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-4);
}

.error-text {
    color: var(--color-status-error);
    font-size: var(--font-size-sm);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-8) var(--spacing-4);
    color: var(--color-text-muted);
}

/* ========================================
   EDULEARN DESIGN SYSTEM - NEW UTILITIES
   ======================================== */

/* Text Colors - Teal/Orange System */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: var(--color-text-white); }
.text-teal { color: var(--color-teal-500); }
.text-orange { color: var(--color-orange-500); }
.text-success { color: var(--color-success-500); }
.text-danger { color: var(--color-danger-500); }

/* Background Colors */
.bg-teal { background-color: var(--color-teal-500); }
.bg-teal-light { background-color: var(--color-teal-100); }
.bg-orange { background-color: var(--color-orange-500); }
.bg-orange-light { background-color: var(--color-orange-100); }
.bg-white { background-color: var(--color-white); }
.bg-light { background-color: var(--color-bg-light); }
.bg-surface { background-color: var(--color-surface-primary); }

/* Teal Variants (Primary) */
.bg-primary { background-color: var(--color-teal-500); }
.bg-primary-light { background-color: var(--color-teal-100); }
.bg-primary-dark { background-color: var(--color-teal-600); }
.text-primary-500 { color: var(--color-teal-500); }
.text-primary-600 { color: var(--color-teal-600); }
.text-primary-700 { color: var(--color-teal-700); }
.border-primary { border-color: var(--color-teal-500); }
.border-primary-light { border-color: var(--color-teal-200); }

/* Orange Variants (Accent/CTA) */
.bg-accent { background-color: var(--color-orange-500); }
.bg-accent-light { background-color: var(--color-orange-100); }
.text-accent { color: var(--color-orange-500); }
.border-accent { border-color: var(--color-orange-500); }

/* Interactive States */
.hover\:bg-teal-light:hover { background-color: var(--color-teal-100); }
.hover\:bg-orange-light:hover { background-color: var(--color-orange-100); }
.hover\:text-teal:hover { color: var(--color-teal-500); }
.hover\:text-orange:hover { color: var(--color-orange-500); }
.hover\:border-primary:hover { border-color: var(--color-teal-500); }

/* Buttons using new design system */
.btn-teal {
    background-color: var(--color-teal-500);
    color: white;
    padding: var(--btn-padding-y) var(--btn-padding-x);
    border-radius: var(--btn-primary-radius);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
}

.btn-teal:hover {
    background-color: var(--color-teal-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-orange {
    background-color: var(--color-orange-500);
    color: white;
    padding: var(--btn-padding-y) var(--btn-padding-x);
    border-radius: var(--btn-primary-radius);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-base);
}

.btn-orange:hover {
    background-color: var(--color-orange-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Badges - EduLearn Style */
.badge-teal {
    background-color: var(--color-teal-500);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
}

.badge-orange {
    background-color: var(--color-orange-500);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
}

.badge-teal-light {
    background-color: var(--color-teal-100);
    color: var(--color-teal-700);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
}

.badge-orange-light {
    background-color: var(--color-orange-100);
    color: var(--color-orange-700);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
}

/* Card Enhancements - Modern EduLearn Style */
.card-modern {
    background: var(--card-bg);
    border-radius: var(--card-radius);
    padding: var(--card-padding);
    box-shadow: var(--card-shadow);
    border: var(--card-border);
    transition: all var(--transition-base);
}

.card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Gradient Overlays */
.gradient-teal {
    background: linear-gradient(135deg, var(--color-teal-500), var(--color-teal-400));
}

.gradient-orange {
    background: linear-gradient(135deg, var(--color-orange-500), var(--color-orange-300));
}

.gradient-teal-orange {
    background: linear-gradient(135deg, var(--color-teal-500), var(--color-orange-500));
}

/* ========================================
   CLEAN MODAL FORM DESIGN SYSTEM
   ======================================== */

/* Clean Modal Container */
.modal-clean {
    background: white;
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 60;
}

/* Modal Backdrop - ensure it covers everything */
.modal-backdrop-clean {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
}

@media (min-width: 640px) {
    .modal-backdrop-clean {
        padding: 16px;
    }
}

.modal-header-clean {
    padding: 16px 20px;
    border-bottom: 1px solid #E5E7EB;
    flex-shrink: 0;
}

.modal-body-clean {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer-clean {
    padding: 16px 20px;
    border-top: 1px solid #E5E7EB;
    flex-shrink: 0;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Clean Form Field - Underline Style */
.form-field-clean {
    margin-bottom: 16px;
}

.form-label-clean {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: #374151;
    margin-bottom: 6px;
}

.form-input-clean {
    width: 100%;
    padding: 10px 0;
    font-size: 15px;
    color: #111827;
    background: transparent;
    border: none;
    border-bottom: 1px solid #D1D5DB;
    outline: none;
    transition: border-color 0.2s ease;
}

.form-input-clean::placeholder {
    color: #9CA3AF;
}

.form-input-clean:focus {
    border-bottom-color: #1E6CE0;
}

.form-input-clean:disabled {
    background-color: #F9FAFB;
    color: #6B7280;
}

/* Clean Select/Dropdown */
.form-select-clean {
    width: 100%;
    padding: 10px 0;
    font-size: 15px;
    color: #111827;
    background: transparent url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236B7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3E%3C/svg%3E") right center no-repeat;
    background-size: 20px;
    border: none;
    border-bottom: 1px solid #D1D5DB;
    outline: none;
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    transition: border-color 0.2s ease;
}

.form-select-clean:focus {
    border-bottom-color: #1E6CE0;
}

/* Clean Checkbox */
.form-checkbox-clean {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    background: #F9FAFB;
    border-radius: 8px;
    cursor: pointer;
}

.form-checkbox-clean input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: #1E6CE0;
    cursor: pointer;
}

.form-checkbox-label {
    font-size: 14px;
    font-weight: 500;
    color: #374151;
}

.form-checkbox-hint {
    font-size: 12px;
    color: #6B7280;
    margin-top: 2px;
}

/* Role Selection Cards - Clean Style */
.role-card-clean {
    padding: 12px 8px;
    border: 2px solid #E5E7EB;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: white;
}

.role-card-clean:hover {
    border-color: #CBD5E1;
    background: #F8FAFC;
}

.role-card-clean.selected {
    border-color: #1E6CE0;
    background: #EFF6FF;
}

.role-card-icon {
    font-size: 24px;
    color: #6B7280;
    margin-bottom: 6px;
}

.role-card-clean.selected .role-card-icon {
    color: #1E6CE0;
}

/* ================================================================
   YouTube IFrame Player — global (unscoped) rule.
   YouTube IFrame API *replaces* the #yt-player div with a new <iframe>
   that has NO Blazor CSS-isolation scope attribute. Without this rule
   the iframe has no position:absolute, is clipped to 0 height by the
   parent overflow:hidden container, and shows only the black background.
   ================================================================ */
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.role-card-name {
    font-size: 11px;
    font-weight: 500;
    color: #4B5563;
    line-height: 1.2;
}

.role-card-clean.selected .role-card-name {
    color: #1E6CE0;
}

/* Clean Button Styles */
.btn-clean-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: white;
    background: #1E6CE0;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-clean-primary:hover:not(:disabled) {
    background: #1859C4;
}

.btn-clean-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-clean-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: #4B5563;
    background: white;
    border: 1px solid #D1D5DB;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-clean-secondary:hover {
    background: #F9FAFB;
    border-color: #9CA3AF;
}

/* Section Divider */
.form-section-divider {
    height: 1px;
    background: #E5E7EB;
    margin: 20px 0;
}

/* Form Grid Layouts */
.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0 16px;
}

.form-grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0 16px;
}

@media (min-width: 640px) {
    .form-grid-2 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile responsive modal */
@media (max-width: 640px) {
    .modal-footer-clean {
        flex-direction: column-reverse;
    }
    
    .modal-footer-clean button {
        width: 100%;
    }
}