/*
 * UNIFIED BUTTON SYSTEM
 * Single source of truth for all button styles across Admin, Public & Student areas
 */

/* ===== 1. BASE BUTTON ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-xl);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-button-hover);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn:focus {
    outline: none;
}

/* ===== 2. SIZES ===== */
.btn-xs {
    padding: 4px 10px;
    font-size: 0.75rem;
}

.btn-sm,
.btn-group-sm > .btn {
    padding: 8px 16px;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

/* ===== 3. SOLID VARIANTS ===== */
.btn-primary {
    background: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-600);
    border-color: var(--primary-600);
    color: var(--text-inverse);
}

.btn-primary:focus,
.btn-primary.focus {
    background: var(--primary);
    color: var(--text-inverse);
    box-shadow: none;
}

.btn-secondary {
    background: var(--secondary);
    color: white;
    border-color: var(--secondary);
    box-shadow: 0 4px 15px rgba(38, 38, 45, 0.3);
}

.btn-secondary:hover {
    background: #1a1a20;
    border-color: #1a1a20;
    color: white;
    box-shadow: 0 8px 25px rgba(38, 38, 45, 0.4);
}

.btn-success {
    background: var(--success);
    border-color: var(--success);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    background: var(--success-dark);
    border-color: var(--success-dark);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: var(--danger);
    border-color: var(--danger);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
    background: var(--danger-dark);
    border-color: var(--danger-dark);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-info {
    background: var(--info);
    border-color: var(--info);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-info:hover {
    background: var(--info-dark);
    border-color: var(--info-dark);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-warning {
    background: var(--warning);
    border-color: var(--warning);
    color: var(--black);
    box-shadow: var(--shadow-sm);
}

.btn-warning:hover {
    background: var(--warning-dark);
    border-color: var(--warning-dark);
    color: var(--black);
    box-shadow: var(--shadow-md);
}

/* ===== 4. OUTLINE VARIANTS ===== */
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--border-focus, var(--primary));
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--text-inverse);
}

.btn-outline-primary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline-primary:hover:not(:disabled) {
    background: var(--primary);
    color: var(--text-inverse);
}

.btn-outline-primary:focus,
.btn-outline-primary.focus {
    box-shadow: none;
}

.btn-outline-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
}

.btn-outline-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-primary);
}

.btn-outline-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.btn-outline-danger:hover:not(:disabled) {
    background: var(--danger);
    color: var(--white);
}

.btn-outline-success {
    background: var(--border-success);
    color: var(--text-inverse);
}

.btn-outline-warning {
    background: var(--border-warning);
    color: var(--text-inverse);
}

/* Section 5 removed – lms-primary-btn replaced by .btn.btn-primary */

/* Section 6 removed – cancel buttons replaced by .btn.btn-outline-secondary */

/* ===== 7. CHANGE PICTURE BUTTON ===== */
.btn-change-picture {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-change-picture:hover {
    background: white;
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-change-picture i {
    font-size: 1.2rem;
}

[data-theme="dark"] .btn-change-picture {
    background: rgba(0, 0, 0, 0.9);
    color: var(--text-primary);
}

[data-theme="dark"] .btn-change-picture:hover {
    background: var(--neutral-800);
}

/* ===== 8. ACTION BUTTONS (icon circles) ===== */
.action-btn {
    width: var(--space-9);
    height: var(--space-9);
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 0 var(--space-1);
    padding: 0;
    transition: var(--transition-all);
    box-shadow: var(--shadow-sm);
    border: none;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    cursor: pointer;
    text-decoration: none;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.action-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.action-btn-info {
    background-color: var(--success);
    color: var(--white);
}

.action-btn-info:hover {
    background-color: var(--success);
    color: var(--white);
}

.action-btn-success {
    background-color: var(--success);
    color: var(--white);
}

.action-btn-success:hover {
    background-color: var(--success-dark);
    color: var(--white);
}

.action-btn-warning {
    background-color: var(--warning);
    color: var(--black);
}

.action-btn-warning:hover {
    background-color: var(--warning-dark);
    color: var(--black);
}

.action-btn-danger {
    background-color: var(--danger-dark);
    color: var(--white);
}

.action-btn-danger:hover {
    background-color: var(--danger-dark);
    color: var(--white);
}

.action-btn-primary {
    background-color: var(--info);
    color: var(--white);
}

.action-btn-primary:hover {
    background-color: var(--info);
    color: var(--white);
}

.action-btn-secondary {
    background-color: var(--gray-600);
    color: var(--white);
}

.action-btn-secondary:hover {
    background-color: var(--gray-700);
    color: var(--white);
}

/* ===== 9. BUTTON GROUPS & CONTAINERS ===== */
.btn-group {
    display: inline-flex;
}

.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-radius: 8px 0 0 8px;
}

.btn-group .btn:last-child {
    border-radius: 0 8px 8px 0;
}

.action-btn-group {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.cta-buttons {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-8);
    flex-wrap: wrap;
}

/* ===== 10. CONTEXT MODIFIERS ===== */

/* Page Header Buttons */
.page-header-actions .btn {
    padding: 0.55rem 1.2rem;
    border-radius: var(--radius-pill);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    white-space: nowrap;
}

.page-header-actions .btn-primary {
    background: var(--primary);
    color: #fff;
}

.page-header-actions .btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
    color: #fff;
}

.page-header-actions .btn-outline-secondary {
    background: transparent;
    border: 1.5px solid var(--border-secondary);
    color: var(--text-secondary);
}

.page-header-actions .btn-outline-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: transparent;
}

/* Form Bottom Actions */
.lms-form-actions .btn {
    padding: 0.55rem 1.2rem;
    border-radius: var(--radius-pill);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    white-space: nowrap;
}

/* Profile Picture Actions */
.action-buttons {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    align-items: center;
    margin-bottom: var(--space-3);
}

.action-buttons .btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.action-buttons .btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
    background: transparent;
}

.action-buttons .btn-outline-primary:hover {
    color: var(--text-inverse);
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.15);
}

.action-buttons .btn-outline-danger {
    color: var(--danger);
    border-color: var(--danger);
    background: transparent;
}

.action-buttons .btn-outline-danger:hover {
    color: var(--text-inverse);
    background: var(--danger);
    border-color: var(--danger);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--danger-rgb), 0.15);
}

/* Media Upload Actions (thumbnails, videos, preview) */
.course-preview-video-actions .btn,
.lesson-thumbnail-actions .btn,
.lesson-video-actions .btn {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
}

.course-preview-video-actions .btn-outline-primary,
.lesson-thumbnail-actions .btn-outline-primary,
.lesson-video-actions .btn-outline-primary {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary-200);
}

.course-preview-video-actions .btn-outline-primary:hover,
.lesson-thumbnail-actions .btn-outline-primary:hover,
.lesson-video-actions .btn-outline-primary:hover {
    background: var(--primary-50);
    color: var(--primary);
    border-color: var(--primary);
}

.course-preview-video-actions .btn-outline-danger,
.lesson-thumbnail-actions .btn-outline-danger,
.lesson-video-actions .btn-outline-danger {
    background: transparent;
    color: var(--danger);
    border-color: var(--danger-light);
}

.course-preview-video-actions .btn-outline-danger:hover,
.lesson-thumbnail-actions .btn-outline-danger:hover,
.lesson-video-actions .btn-outline-danger:hover {
    background: var(--danger-light);
    color: var(--danger);
    border-color: var(--danger);
}

.lesson-thumbnail-actions .btn i,
.lesson-video-actions .btn i {
    font-size: 0.75rem;
    opacity: 0.9;
}

/* Confirmation Modal Buttons */
.confirmation-modal .confirmation-footer .btn {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.confirmation-modal .confirmation-footer .btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.confirmation-modal .confirmation-footer .btn:active::before {
    width: 300px;
    height: 300px;
}

.confirmation-modal .confirmation-footer .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.confirmation-modal .confirmation-footer .btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.confirmation-modal .confirmation-footer .btn i {
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.confirmation-modal .confirmation-footer .btn:hover i {
    transform: scale(1.1);
}

/* Curriculum Lesson Action Buttons (ghost style) */
.lesson-actions .action-btn {
    width: 32px;
    height: 32px;
    padding-top: 2px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-secondary);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.8rem;
    text-decoration: none;
    align-content: center;
    box-shadow: none;
    margin: 0;
}

.lesson-actions .action-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-50);
    transform: none;
}

.lesson-actions .action-btn-danger:hover {
    border-color: var(--danger);
    color: var(--danger);
    background: var(--danger-light);
}

.lesson-actions .action-btn-success:hover {
    border-color: var(--success);
    color: var(--success);
    background: var(--success-light);
}

.curriculum-module .lesson-actions .action-btn:hover {
    background: var(--primary-50);
    color: var(--primary);
}

.curriculum-module .lesson-actions .action-btn-danger:hover {
    color: var(--danger);
    background: var(--danger-light);
}

.curriculum-module .lesson-actions .action-btn-success {
    color: var(--success);
}

.curriculum-module .lesson-actions .action-btn-success:hover {
    background: var(--success-light);
}

/* Curriculum Publish Button */
.curriculum-publish-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0.625rem 1.5rem;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-inverse);
    background: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: background 0.2s, box-shadow 0.2s;
}

.curriculum-publish-btn:hover:not(:disabled) {
    background: var(--primary-600);
    box-shadow: var(--shadow-button-hover);
}

.curriculum-publish-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Empty State Button Spacing */
.empty-state .btn {
    margin-top: var(--space-2);
}

/* Settings Button */
.settings-page .btn-primary {
    margin-top: var(--space-4);
}

/* Profile Danger Zone */
.profile-danger-zone .btn-danger {
    background: var(--danger);
    border-color: var(--danger);
    color: var(--white) !important;
}

.profile-danger-zone .btn-danger:hover {
    background: var(--danger-dark);
    border-color: var(--danger-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Loading State */
.loading .btn {
    pointer-events: none;
    opacity: 0.7;
}

.loading .btn i {
    animation: spin 1s linear infinite;
}

/* ===== 11. BADGES ===== */
.badge {
    display: inline-block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-2xl);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
}

.badge-success {
    background: var(--success);
    color: var(--white);
}

.badge-danger {
    background: var(--danger);
    color: var(--white);
}

.badge-warning {
    background: var(--warning);
    color: var(--white);
}

.badge-info {
    background: var(--info);
    color: var(--white);
}

.badge-primary {
    background: var(--primary);
    color: var(--text-inverse);
}

.badge-secondary {
    background: var(--secondary);
    color: white;
}

/* ===== 12. RESPONSIVE ===== */
@media (max-width: 768px) {
    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        border-radius: 8px;
        margin-bottom: 5px;
    }

    .btn-group .btn:first-child,
    .btn-group .btn:last-child {
        border-radius: 8px;
    }

    .action-btn {
        width: var(--space-8);
        height: var(--space-8);
        font-size: var(--text-xs);
    }

    .action-btn:hover {
        transform: none;
    }

    .action-buttons {
        flex-direction: column;
        gap: var(--space-3);
    }

    .action-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .btn-change-picture {
        width: 35px;
        height: 35px;
    }

    .btn-change-picture i {
        font-size: 1rem;
    }

    .lms-form-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .lms-actions .btn-primary {
        width: 100%;
        justify-content: center;
    }

    .confirmation-modal .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 576px) {
    .action-btn-group {
        justify-content: flex-start;
        gap: var(--space-2);
    }
}