/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1DA1F2;
    --primary-hover: #1991DA;
    --secondary-color: #F7F9FA;
    --text-primary: #0F1419;
    --text-secondary: #536471;
    --text-muted: #8B98A5;
    --border-color: #EFF3F4;
    --card-bg: #ffffff;
    --hover-bg: #F7F9FA;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--card-bg);
    font-size: 15px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Main content */
.main-content {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--card-bg);
    min-height: calc(100vh - 400px);
}

/* Loading spinner */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    text-align: center;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.spinner-small {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--text-secondary);
    font-size: 15px;
}

.infinite-loading {
    display: none;
    text-align: center;
    padding: 20px;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.infinite-loading p {
    color: var(--text-secondary);
    margin-top: 8px;
    font-size: 14px;
}

/* Empty state */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state .material-symbols-outlined {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h2 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 800;
}

.empty-state p {
    font-size: 15px;
    color: var(--text-secondary);
}

/* Search section */
.search-section {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--card-bg);
    position: sticky;
    top: 0;
    z-index: 102; /* Higher than profile nav to ensure it stays visible */
    margin-top: -1px; /* Overlap the border with profile nav */
    border-top: 1px solid var(--border-color);
}

.search-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.post-count {
    font-size: 20px;
    color: var(--text-primary);
    font-weight: 800;
    line-height: 24px;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    width: 100%;
    padding: 12px 16px 12px 48px;
    font-size: 15px;
    background: var(--secondary-color);
    color: var(--text-primary);
    border: 1px solid var(--secondary-color);
    border-radius: var(--radius-full);
    outline: none;
    transition: all 0.2s ease;
}

.search-input:focus {
    background-color: var(--card-bg);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(29, 161, 242, 0.2);
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 20px;
    pointer-events: none;
}

.clear-button {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 20px;
    padding: 4px;
    border-radius: 50%;
    display: none;
    transition: all 0.2s ease;
}

.clear-button:hover {
    background-color: var(--hover-bg);
}

.search-help-button {
    position: absolute;
    right: 45px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-help-button:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
}

.search-help-panel {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
}

.search-help-panel.show {
    display: block;
}

.search-help-content {
    padding: 16px;
}

.search-help-content h4 {
    margin: 0 0 12px 0;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
}

.search-help-content ul {
    margin: 0 0 12px 0;
    padding-left: 16px;
    list-style-type: disc;
}

.search-help-content li {
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.search-help-content li strong {
    color: var(--text-primary);
}

.search-help-content p {
    margin: 0;
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
}

.search-results-count {
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 4px;
    line-height: 1.4;
}

.search-results-count .search-details {
    font-size: 11px;
    opacity: 0.8;
    margin-top: 2px;
    display: block;
    font-style: italic;
}

/* Date filter styles */
.date-filter-section {
    margin-top: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background-color: var(--card-bg);
}

.date-filter-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    border-radius: var(--radius-lg);
}

.date-filter-header:hover {
    background-color: var(--hover-bg);
}

.date-filter-header span:first-child {
    color: var(--text-secondary);
    font-size: 18px;
}

.date-filter-header span:nth-child(2) {
    flex-grow: 1;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
}

.toggle-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.toggle-button:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
}

.toggle-button .material-symbols-outlined {
    font-size: 20px;
    transition: transform 0.2s ease;
}

.toggle-button.expanded .material-symbols-outlined {
    transform: rotate(180deg);
}

.date-filter-controls {
    display: none;
    padding: 0 16px 16px 16px;
    border-top: 1px solid var(--border-color);
    margin-top: -1px;
}

.date-filter-controls.expanded {
    display: block;
}

.date-inputs {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.date-input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.date-input-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.date-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-primary);
    background-color: var(--card-bg);
    transition: all 0.2s ease;
}

.date-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(29, 161, 242, 0.2);
}

.date-filter-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.apply-filter-btn, .clear-filter-btn {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.apply-filter-btn {
    background-color: var(--primary-color);
    color: white;
    flex: 1;
}

.apply-filter-btn:hover {
    background-color: var(--primary-hover);
}

.apply-filter-btn:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
}

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

.clear-filter-btn:hover {
    background-color: var(--hover-bg);
}

.date-presets {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 6px 12px;
    background-color: var(--secondary-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.preset-btn:hover {
    background-color: var(--hover-bg);
    border-color: var(--text-secondary);
}

.preset-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Posts grid */
.posts-grid {
    background-color: var(--card-bg);
}

/* Post cards */
.post {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

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

.post:last-child {
    border-bottom: none;
}

.post-avatar {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 16px;
    position: relative;
}

.post-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.post .meta {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
    font-size: 15px;
    gap: 4px;
    flex-wrap: wrap;
}

.post .handle {
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.post .handle:hover {
    color: var(--primary-color);
}

.post .separator {
    width: 2px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: 50%;
    margin: 0 4px;
}

.post .date {
    color: var(--text-secondary);
    font-size: 15px;
    text-decoration: none;
    transition: color 0.2s ease;
    font-weight: 400;
}

.post .date:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.post .text {
    font-size: 15px;
    line-height: 22px;
    color: var(--text-primary);
    white-space: pre-line;
    word-break: break-word;
    margin: 8px 0 12px 0;
    font-weight: 400;
}

.post.hidden {
    display: none;
}

.post.highlight .text {
    background: linear-gradient(120deg, #fff59d 0%, #fff59d 100%);
    background-size: 100% 0;
    background-repeat: no-repeat;
    background-position: 0 100%;
    transition: background-size 0.3s ease;
}

.post.highlight .text.match {
    background-size: 100% 100%;
}

/* Enhanced highlighting for different match types */
.post .text mark {
    background: linear-gradient(135deg, #fef08a 0%, #fde047 100%);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-weight: 600;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.post .text mark:hover {
    background: linear-gradient(135deg, #fde047 0%, #facc15 100%);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Fuzzy match highlighting */
.post .text mark.fuzzy-match {
    background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%);
    border: 1px solid #a78bfa;
}

/* Stemmed match highlighting */
.post .text mark.stem-match {
    background: linear-gradient(135deg, #bbf7d0 0%, #86efac 100%);
    border: 1px solid #4ade80;
}





.post .post-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 8px;
    opacity: 0;
    transition: opacity 0.2s ease;
    border-top: 1px solid transparent;
}

.post:hover .post-actions {
    opacity: 1;
    border-top: 1px solid var(--border-color);
}

.post .post-link {
    color: var(--text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    padding: 6px 12px;
    border-radius: var(--radius-full);
    transition: all 0.2s ease;
    font-weight: 500;
    background-color: transparent;
    border: 1px solid var(--border-color);
}

.post .post-link:hover {
    color: var(--primary-color);
    background-color: rgba(29, 161, 242, 0.1);
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.post .post-link .material-symbols-outlined {
    font-size: 16px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px 16px;
    font-size: 13px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    background: var(--card-bg);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .profile-header {
        padding: 0 16px;
    }
    
    .profile-image-wrapper {
        left: 16px;
    }
    
    .profile-image {
        width: 110px;
        height: 110px;
        border-width: 3px;
    }
    
    .profile-image-wrapper {
        top: -55px;
    }
    
    .profile-actions {
        padding: 8px 0;
    }
    
    .profile-info h2 {
        font-size: 18px;
        line-height: 22px;
    }
    
    .profile-info .verified {
        width: 18px;
        height: 18px;
        font-size: 11px;
    }
    
    .profile-stats {
        gap: 16px;
    }
    
    .nav-link {
        padding: 12px 8px;
        font-size: 14px;
    }
    
    .nav-link.active::after {
        width: 40px;
    }
    
    .search-section {
        padding: 12px 16px;
        top: 0;
        z-index: 102;
    }
    
    .post-count {
        font-size: 18px;
        line-height: 22px;
    }
    
        .post {
        padding: 12px 16px;
        gap: 10px;
    }
    
    .post-avatar {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .search-input {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

@media (max-width: 480px) {
    .profile-header {
        padding: 0 12px;
    }
    
    .profile-image-wrapper {
        left: 12px;
    }
    
    .profile-image {
        width: 90px;
        height: 90px;
    }
    
    .profile-image-wrapper {
        top: -45px;
    }
    
    .profile-info h2 {
        font-size: 16px;
        line-height: 20px;
    }
    
    .profile-info .verified {
        width: 16px;
        height: 16px;
        font-size: 10px;
    }
    
    .profile-stats {
        gap: 12px;
        font-size: 14px;
    }
    
    .profile-meta {
        font-size: 14px;
        gap: 8px;
    }
    
    .post-count {
        font-size: 16px;
        line-height: 20px;
    }
    
    .search-section {
        padding: 8px 12px;
        top: 0;
        z-index: 102;
    }
    
        .post {
        padding: 10px 12px;
        gap: 8px;
    }
    
    .post-avatar {
        width: 32px;
        height: 32px;
        font-size: 12px;
    }

    .post .text {
        font-size: 14px;
        line-height: 18px;
    }

    .post .meta {
        font-size: 14px;
    }
    
    .post .post-link {
        font-size: 12px;
        padding: 4px 8px;
    }
    
    .date-inputs {
        flex-direction: column;
        gap: 8px;
    }
    
    .date-filter-actions {
        flex-direction: column;
        gap: 6px;
    }
    
    .date-presets {
        justify-content: center;
    }
    
    .preset-btn {
        font-size: 11px;
        padding: 5px 10px;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
.post:focus-within,
.nav-link:focus,
.search-input:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Profile Section */
.profile-section {
    position: relative;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    max-width: 100%;
    margin: 0 auto;
}

.banner-image {
    width: 100%;
    height: 200px;
    position: relative;
    overflow: hidden;
    background-color: var(--secondary-color);
}

.banner-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.profile-header {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 16px;
    position: relative;
}

.profile-image-wrapper {
    position: absolute;
    top: -67px;
    left: 16px;
    z-index: 10;
}

.profile-image {
    width: 134px;
    height: 134px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--card-bg);
    background-color: var(--card-bg);
    box-shadow: var(--shadow-md);
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 12px 0;
    margin-bottom: 4px;
}

.action-btn, .follow-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0 16px;
    height: 36px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
}

.action-btn {
    padding: 0;
    width: 36px;
    color: var(--text-primary);
}

.action-btn:hover {
    background-color: var(--hover-bg);
}

.follow-btn {
    background-color: var(--text-primary);
    color: var(--card-bg);
    border: 1px solid var(--text-primary);
    padding: 0 24px;
}

.follow-btn:hover {
    background-color: #272c30;
}

.profile-info {
    padding-top: 4px;
    padding-bottom: 16px;
}

.profile-info h2 {
    margin: 0 0 0 0;
    font-size: 20px;
    font-weight: 800;
    line-height: 24px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.profile-info .verified {
    background-color: #1d9bf0;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    line-height: 1;
    font-weight: 900;
    margin-left: 4px;
    flex-shrink: 0;
}

.profile-info .handle {
    color: var(--text-secondary);
    font-size: 15px;
    margin: 0 0 12px 0;
    font-weight: 400;
}

.profile-info .bio {
    margin: 0 0 12px 0;
    font-size: 15px;
    line-height: 20px;
    color: var(--text-primary);
    white-space: pre-line;
}

.profile-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.profile-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.profile-meta a {
    color: var(--primary-color);
    text-decoration: none;
}

.profile-meta a:hover {
    text-decoration: underline;
}

.profile-stats {
    display: flex;
    gap: 20px;
    font-size: 15px;
    margin-bottom: 16px;
}

.profile-stats span {
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease;
}

.profile-stats span:hover {
    color: var(--text-primary);
}

.profile-stats strong {
    font-weight: 700;
    color: var(--text-primary);
    margin-right: 4px;
}

/* Loading and Empty States */
.loading, .empty-state, .error-state {
    display: none;
    text-align: center;
    padding: 2rem;
    font-size: 1rem;
    color: var(--text-muted);
}

.loading {
    display: block;
    margin: 2rem auto;
}

.error-state {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    text-align: center;
    color: #dc2626;
    margin: 2rem auto;
    max-width: 500px;
}

/* Profile Navigation */
.profile-nav {
    border-bottom: 1px solid var(--border-color);
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--card-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-link {
    display: block;
    padding: 16px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 20px;
    position: relative;
    background-color: transparent;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 16px;
    width: 56px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

/* Utility classes for toggling visibility */
#posts-container {
    display: none;
}

#empty-state {
    display: none;
}

.show {
    display: block !important;
}

.show-flex {
    display: flex !important;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}