/**
 * Growzy UX Enhancements CSS
 * Loading States, Skeleton Screens, Search, Keyboard Shortcuts
 */

/* ===========================================
   1. SKELETON LOADING SCREENS
   =========================================== */

/* Base Skeleton Animation */
@keyframes skeleton-pulse {
    0% { opacity: 1; }
    50% { opacity: 0.4; }
    100% { opacity: 1; }
}

@keyframes skeleton-shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.skeleton {
    background: linear-gradient(90deg,
        var(--color-border-light, #e2e8f0) 25%,
        var(--color-cream, #f8fafc) 50%,
        var(--color-border-light, #e2e8f0) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
    border-radius: 8px;
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-text.small {
    height: 12px;
    width: 60%;
}

.skeleton-text.large {
    height: 24px;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.skeleton-image {
    width: 100%;
    height: 200px;
    border-radius: 12px;
}

.skeleton-button {
    width: 100px;
    height: 40px;
    border-radius: 8px;
}

/* Feed Card Skeleton */
.skeleton-feed-card {
    background: var(--color-white, #ffffff);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.skeleton-feed-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.skeleton-feed-meta {
    flex: 1;
}

.skeleton-feed-content {
    margin-bottom: 16px;
}

.skeleton-feed-actions {
    display: flex;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border-light, #e2e8f0);
}

/* Profile Skeleton */
.skeleton-profile-header {
    background: linear-gradient(135deg,
        var(--color-border-light, #e2e8f0) 0%,
        var(--color-cream, #f1f5f9) 100%
    );
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 24px;
}

.skeleton-profile-info {
    display: flex;
    align-items: center;
    gap: 24px;
}

.skeleton-profile-avatar {
    width: 100px;
    height: 100px;
    border-radius: 20px;
}

.skeleton-profile-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.skeleton-stat-card {
    background: var(--color-white, #ffffff);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
}

/* Course Card Skeleton */
.skeleton-course-card {
    background: var(--color-white, #ffffff);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.skeleton-course-image {
    height: 160px;
    border-radius: 12px;
    margin-bottom: 16px;
}

.skeleton-progress-bar {
    height: 8px;
    border-radius: 4px;
    margin: 12px 0;
}

/* ===========================================
   2. LOADING STATES
   =========================================== */

/* Spinner */
.loading-spinner {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.loading-spinner::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border, #e2e8f0);
    border-top-color: var(--color-accent, #6366f1);
    border-radius: 50%;
    animation: spinner-rotate 0.8s linear infinite;
}

.loading-spinner.large::after {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

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

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    border-radius: inherit;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Button Loading State */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    top: 50%;
    left: 50%;
    margin-left: -9px;
    margin-top: -9px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spinner-rotate 0.6s linear infinite;
}

/* Infinite Scroll Loading */
.infinite-scroll-loader {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
    gap: 12px;
    color: var(--color-text-secondary, #64748b);
}

.infinite-scroll-loader .dots {
    display: flex;
    gap: 6px;
}

.infinite-scroll-loader .dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent, #6366f1);
    border-radius: 50%;
    animation: dots-bounce 1.4s ease-in-out infinite both;
}

.infinite-scroll-loader .dot:nth-child(1) { animation-delay: -0.32s; }
.infinite-scroll-loader .dot:nth-child(2) { animation-delay: -0.16s; }
.infinite-scroll-loader .dot:nth-child(3) { animation-delay: 0; }

@keyframes dots-bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* ===========================================
   3. GLOBAL SEARCH
   =========================================== */

/* Search Modal Overlay */
.search-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
}

.search-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Search Modal */
.search-modal {
    position: fixed;
    top: 15%;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    width: 90%;
    max-width: 640px;
    background: var(--color-white, #ffffff);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
    overflow: hidden;
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* Search Input */
.search-modal-header {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border-light, #e2e8f0);
    gap: 12px;
}

.search-modal-icon {
    width: 24px;
    height: 24px;
    color: var(--color-text-secondary, #64748b);
    flex-shrink: 0;
}

.search-modal-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 18px;
    font-weight: 500;
    color: var(--color-text-primary, #1e293b);
    background: transparent;
}

.search-modal-input::placeholder {
    color: var(--color-text-muted, #94a3b8);
}

.search-modal-shortcut {
    padding: 4px 8px;
    background: var(--color-cream, #f1f5f9);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary, #64748b);
}

/* Search Results */
.search-modal-content {
    max-height: 400px;
    overflow-y: auto;
}

.search-category {
    padding: 12px 20px 8px;
}

.search-category-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted, #94a3b8);
}

.search-results {
    padding: 8px;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.15s;
}

.search-result-item:hover,
.search-result-item.selected {
    background: var(--color-cream, #f1f5f9);
}

.search-result-item.selected {
    background: var(--color-accent-subtle, rgba(99, 102, 241, 0.1));
}

.search-result-icon {
    width: 40px;
    height: 40px;
    background: var(--color-cream, #f1f5f9);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.search-result-content {
    flex: 1;
    min-width: 0;
}

.search-result-title {
    font-weight: 600;
    color: var(--color-text-primary, #1e293b);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-result-meta {
    font-size: 13px;
    color: var(--color-text-secondary, #64748b);
}

.search-result-arrow {
    color: var(--color-text-muted, #94a3b8);
    opacity: 0;
    transition: opacity 0.15s;
}

.search-result-item:hover .search-result-arrow,
.search-result-item.selected .search-result-arrow {
    opacity: 1;
}

/* Search Footer */
.search-modal-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: var(--color-cream, #f8fafc);
    border-top: 1px solid var(--color-border-light, #e2e8f0);
    font-size: 12px;
    color: var(--color-text-secondary, #64748b);
}

.search-shortcuts {
    display: flex;
    gap: 16px;
}

.search-shortcut-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.search-shortcut-key {
    padding: 2px 6px;
    background: var(--color-white, #ffffff);
    border: 1px solid var(--color-border, #e2e8f0);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

/* No Results */
.search-no-results {
    padding: 48px 20px;
    text-align: center;
}

.search-no-results-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.search-no-results-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-primary, #1e293b);
    margin-bottom: 8px;
}

.search-no-results-text {
    color: var(--color-text-secondary, #64748b);
}

/* ===========================================
   4. KEYBOARD SHORTCUTS INDICATOR
   =========================================== */

/* Shortcuts Help Modal */
.shortcuts-help-modal {
    position: fixed;
    bottom: 80px;
    left: 20px;
    background: var(--color-white, #ffffff);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    padding: 20px;
    width: 320px;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s;
}

.shortcuts-help-modal.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.shortcuts-help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.shortcuts-help-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-primary, #1e293b);
}

.shortcuts-help-close {
    width: 28px;
    height: 28px;
    border: none;
    background: var(--color-cream, #f1f5f9);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.shortcuts-help-close:hover {
    background: var(--color-border, #e2e8f0);
}

.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
}

.shortcut-action {
    font-size: 14px;
    color: var(--color-text-secondary, #64748b);
}

.shortcut-keys {
    display: flex;
    gap: 4px;
}

.shortcut-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    padding: 0 8px;
    background: var(--color-cream, #f1f5f9);
    border: 1px solid var(--color-border, #e2e8f0);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-primary, #1e293b);
}

/* Keyboard Shortcuts Toggle Button */
.shortcuts-toggle-btn {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 48px;
    height: 48px;
    background: var(--color-accent, #6366f1);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
    z-index: 9998;
}

.shortcuts-toggle-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

/* Focus indicator for keyboard navigation */
.feed-card-focused {
    outline: 3px solid var(--color-accent, #6366f1);
    outline-offset: 2px;
}

/* ===========================================
   5. ENHANCED ONBOARDING
   =========================================== */

/* Onboarding Step Indicator */
.onboarding-steps-indicator {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 32px;
}

.step-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-border, #e2e8f0);
    transition: all 0.3s;
}

.step-dot.active {
    width: 32px;
    border-radius: 5px;
    background: var(--color-accent, #6366f1);
}

.step-dot.completed {
    background: var(--color-success, #10b981);
}

/* Onboarding Animation */
.onboarding-step-enter {
    animation: step-enter 0.4s ease-out;
}

@keyframes step-enter {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.onboarding-step-exit {
    animation: step-exit 0.3s ease-in;
}

@keyframes step-exit {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(-30px);
    }
}

/* Interest Selection Enhanced */
.interest-grid-enhanced {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.interest-card {
    position: relative;
    padding: 20px;
    border: 2px solid var(--color-border, #e2e8f0);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.interest-card:hover {
    border-color: var(--color-accent, #6366f1);
    transform: translateY(-2px);
}

.interest-card.selected {
    border-color: var(--color-accent, #6366f1);
    background: var(--color-accent-subtle, rgba(99, 102, 241, 0.08));
}

.interest-card-check {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 24px;
    height: 24px;
    background: var(--color-accent, #6366f1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.2s;
}

.interest-card.selected .interest-card-check {
    opacity: 1;
    transform: scale(1);
}

/* Experience Level Selector */
.experience-selector {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.experience-option {
    flex: 1;
    padding: 16px;
    border: 2px solid var(--color-border, #e2e8f0);
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.experience-option:hover {
    border-color: var(--color-accent, #6366f1);
}

.experience-option.selected {
    border-color: var(--color-accent, #6366f1);
    background: var(--color-accent-subtle, rgba(99, 102, 241, 0.08));
}

.experience-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.experience-label {
    font-weight: 600;
    color: var(--color-text-primary, #1e293b);
}

.experience-desc {
    font-size: 12px;
    color: var(--color-text-secondary, #64748b);
    margin-top: 4px;
}

/* ===========================================
   6. PROFILE ENHANCEMENTS
   =========================================== */

/* Profile Activity Timeline */
.profile-activity-timeline {
    position: relative;
    padding-left: 24px;
}

.profile-activity-timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border, #e2e8f0);
}

.activity-timeline-item {
    position: relative;
    padding-bottom: 24px;
}

.activity-timeline-item::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 4px;
    width: 12px;
    height: 12px;
    background: var(--color-white, #ffffff);
    border: 2px solid var(--color-accent, #6366f1);
    border-radius: 50%;
}

.activity-timeline-content {
    background: var(--color-cream, #f8fafc);
    padding: 16px;
    border-radius: 12px;
}

.activity-timeline-date {
    font-size: 12px;
    color: var(--color-text-muted, #94a3b8);
    margin-bottom: 4px;
}

.activity-timeline-title {
    font-weight: 600;
    color: var(--color-text-primary, #1e293b);
}

/* Profile Achievements Grid */
.profile-achievements-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.achievement-badge {
    text-align: center;
    padding: 20px;
    background: var(--color-cream, #f8fafc);
    border-radius: 16px;
    transition: transform 0.2s;
}

.achievement-badge:hover {
    transform: translateY(-4px);
}

.achievement-badge.locked {
    opacity: 0.5;
    filter: grayscale(1);
}

.achievement-badge-icon {
    font-size: 40px;
    margin-bottom: 8px;
}

.achievement-badge-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-primary, #1e293b);
}

.achievement-badge-date {
    font-size: 11px;
    color: var(--color-text-muted, #94a3b8);
    margin-top: 4px;
}

/* Profile Skills */
.profile-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.profile-skill-tag {
    padding: 6px 14px;
    background: var(--color-accent-subtle, rgba(99, 102, 241, 0.1));
    color: var(--color-accent, #6366f1);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

/* ===========================================
   7. TOAST NOTIFICATIONS
   =========================================== */

.toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--color-text-primary, #1e293b);
    color: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: toast-enter 0.3s ease-out;
}

.toast.success {
    background: var(--color-success, #10b981);
}

.toast.error {
    background: var(--color-error, #ef4444);
}

.toast.warning {
    background: var(--color-warning, #f59e0b);
}

.toast-exit {
    animation: toast-exit 0.2s ease-in forwards;
}

@keyframes toast-enter {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toast-exit {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(20px);
    }
}

/* ===========================================
   8. RESPONSIVE ADJUSTMENTS
   =========================================== */

@media (max-width: 768px) {
    .search-modal {
        top: 0;
        width: 100%;
        max-width: 100%;
        border-radius: 0;
        height: 100vh;
    }

    .search-modal-content {
        max-height: calc(100vh - 140px);
    }

    .shortcuts-help-modal {
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        border-radius: 16px 16px 0 0;
    }

    .shortcuts-toggle-btn {
        bottom: 80px;
        left: 20px;
    }

    .interest-grid-enhanced {
        grid-template-columns: repeat(2, 1fr);
    }

    .experience-selector {
        flex-direction: column;
    }

    .profile-achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .skeleton-profile-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .interest-grid-enhanced {
        grid-template-columns: 1fr;
    }
}

/* ===========================================
   9. DARK MODE SUPPORT
   =========================================== */

@media (prefers-color-scheme: dark) {
    .skeleton {
        background: linear-gradient(90deg,
            #2d3748 25%,
            #4a5568 50%,
            #2d3748 75%
        );
    }

    .search-modal,
    .shortcuts-help-modal {
        background: #1a1a2e;
        color: #f4f6fb;
    }

    .search-modal-input {
        color: #f4f6fb;
    }

    .search-result-item:hover,
    .search-result-item.selected {
        background: rgba(255, 255, 255, 0.05);
    }

    .search-modal-footer {
        background: #14172a;
        border-color: rgba(255, 255, 255, 0.08);
    }
}

/* ===========================================
   10. ACCESSIBILITY
   =========================================== */

@media (prefers-reduced-motion: reduce) {
    .skeleton,
    .loading-spinner::after,
    .btn-loading::after,
    .infinite-scroll-loader .dot {
        animation: none;
    }

    .search-modal,
    .shortcuts-help-modal,
    .toast {
        transition: none;
    }

    .onboarding-step-enter,
    .onboarding-step-exit {
        animation: none;
    }
}

/* Focus visible for keyboard users */
.search-modal-input:focus-visible,
.search-result-item:focus-visible,
.shortcut-item:focus-visible {
    outline: 2px solid var(--color-accent, #6366f1);
    outline-offset: 2px;
}