:root {
    /* Color Palette */
    --bg-primary: #0a0e1a;
    --bg-secondary: #151b2e;
    --bg-card: #1a2234;
    --bg-card-hover: #1f2840;

    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;

    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    --color-likes: #f43f5e;
    --color-views: #06b6d4;
    --color-posts: #8b5cf6;
    --color-time: #10b981;

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-md);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Mobile Sticky Navigation */
.mobile-sticky-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    display: none;
}

.mobile-sticky-nav.visible {
    transform: translateY(0);
}

.mobile-nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    max-width: 100vw;
    gap: 0.75rem;
}

.mobile-nav-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.mobile-nav-icon {
    width: 20px;
    height: 20px;
    color: var(--accent-primary);
}

.mobile-nav-dates {
    display: flex;
    gap: 0.25rem;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    flex: 1;
    min-width: 0;
}

.mobile-nav-dates::-webkit-scrollbar {
    display: none;
}

.mobile-nav-dates .date-tab {
    padding: 0.35rem 0.75rem;
    font-size: 0.8125rem;
    white-space: nowrap;
    flex-shrink: 0;
}

/* Show only on mobile */
@media (max-width: 768px) {
    .mobile-sticky-nav {
        display: block;
    }

    body.nav-visible {
        padding-top: 3rem;
    }
}

/* Header */
.header {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.header-content {
    position: relative;
    z-index: 1;
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
    filter: drop-shadow(0 0 20px rgba(59, 130, 246, 0.5));
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(102, 126, 234, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 28px;
    height: 28px;
}

.stat-icon.likes {
    background: rgba(244, 63, 94, 0.15);
    color: var(--color-likes);
}

.stat-icon.views {
    background: rgba(6, 182, 212, 0.15);
    color: var(--color-views);
}

.stat-icon.posts {
    background: rgba(139, 92, 246, 0.15);
    color: var(--color-posts);
}

.stat-icon.time {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-time);
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-time {
    font-size: 1.25rem;
}

/* Hot Topic */
.hot-topic {
    background: linear-gradient(135deg, rgba(244, 63, 94, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid rgba(244, 63, 94, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hot-badge {
    background: linear-gradient(135deg, #f43f5e 0%, #ec4899 100%);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3);
}

.topic-text {
    flex: 1;
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
    min-width: 200px;
}

.topic-author {
    color: var(--accent-primary);
    font-weight: 600;
    font-size: 0.9375rem;
}

/* Content Section */
.content-section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 28px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* Content List - Masonry Layout */
.masonry-grid {
    column-count: 3;
    column-gap: var(--spacing-md);
    align-items: flex-start;
}

.masonry-item {
    break-inside: avoid;
    margin-bottom: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    transform-origin: top;
}

/* Tweet Embed Container */
.tweet-embed-container {
    margin: 0;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: none;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.tweet-embed-container.loaded {
    min-height: auto;
}

/* Date Navigation Tabs */
.date-tabs-container {
    position: relative;
    margin-top: 0.5rem;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-card) var(--bg-secondary);
}

.date-tabs-container::-webkit-scrollbar {
    height: 4px;
}

.date-tabs-container::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 2px;
}

.date-tabs-container::-webkit-scrollbar-thumb {
    background: var(--bg-card);
    border-radius: 2px;
}

.date-tabs {
    display: flex;
    position: relative;
    padding: 0.5rem 0;
    min-width: 100%;
}

.date-tab {
    padding: 0.75rem 1.5rem;
    margin: 0 0.25rem;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
    position: relative;
    z-index: 2;
    flex-shrink: 0;
}

.date-tab:first-child {
    margin-left: 0;
}

.date-tab:last-child {
    margin-right: 0;
}

.date-tab:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.date-tab.active {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.date-tab-slider {
    position: absolute;
    bottom: 0;
    height: 3px;
    background: var(--accent-primary);
    transition: all var(--transition-normal);
    z-index: 1;
}

.date-nav-card {
    padding: var(--spacing-lg);
}

.loading-dates {
    display: flex;
    justify-content: center;
    padding: 1rem;
    color: var(--text-secondary);
}

.no-dates {
    text-align: center;
    padding: 1rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Loading states for better UX */
.content-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.content-loading .loading-spinner {
    margin-bottom: 1rem;
}

.date-tab.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

.footer p {
    margin-bottom: var(--spacing-xs);
    font-size: 0.9375rem;
}

.footer-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Responsive Design */

/* Tablet and below */
@media (max-width: 1024px) {
    .masonry-grid {
        column-count: 2;
    }
}

/* Mobile devices */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-xs);
    }

    .container {
        padding: 0;
    }

    /* Header adjustments */
    .header {
        padding: var(--spacing-lg) 0;
        margin-bottom: var(--spacing-md);
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .logo-icon {
        width: 36px;
        height: 36px;
    }

    .subtitle {
        font-size: 0.9rem;
    }

    /* Single column masonry for mobile */
    .masonry-grid {
        column-count: 1;
        column-gap: 0;
    }

    .masonry-item {
        margin-bottom: var(--spacing-sm);
    }

    /* Stats grid - single column */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .stat-card {
        padding: var(--spacing-sm);
    }

    /* Date navigation */
    .date-nav-card {
        padding: var(--spacing-sm);
    }

    .date-tab {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .date-tabs-container {
        margin-top: 0.25rem;
    }

    /* Hot topic */
    .hot-topic {
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    /* Tweet containers */
    .tweet-embed-container {
        padding: var(--spacing-sm);
    }

    /* Footer */
    .footer {
        padding: var(--spacing-md) 0;
        font-size: 0.875rem;
    }

    .footer p {
        font-size: 0.875rem;
    }

    .footer-note {
        font-size: 0.8125rem;
    }

    /* Remove hover effects on mobile */
    .content-item:hover {
        transform: none;
    }

    .stat-card:hover {
        transform: none;
    }
}

/* Small mobile devices */
@media (max-width: 480px) {
    .header h1 {
        font-size: 1.25rem;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
    }

    .date-tab {
        padding: 0.4rem 0.75rem;
        font-size: 0.8125rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .stat-icon {
        width: 48px;
        height: 48px;
    }

    .stat-icon svg {
        width: 24px;
        height: 24px;
    }
}

/* Loading Animation */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

.loading {
    background: linear-gradient(90deg,
            var(--bg-card) 0%,
            var(--bg-card-hover) 50%,
            var(--bg-card) 100%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

/* Tweet Embed Container */
.tweet-embed-container {
    margin: 0;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: none;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.tweet-embed-container.loaded {
    background: transparent;
    border: none;
    padding: 0;
    display: block;
    min-height: auto;
}

/* Tweet Loading State */
.tweet-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    width: 100%;
    min-height: 160px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Tweet Error State */
.tweet-error {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-md);
    font-size: 0.9375rem;
}

/* Twitter Embed Styling Override */
.tweet-embed-container .twitter-tweet {
    margin: 0 !important;
    max-width: 100% !important;
    width: 100% !important;
}

.tweet-embed-container .twitter-tweet iframe {
    border-radius: var(--radius-md) !important;
    width: 100% !important;
    min-height: 200px !important;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-card);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-card-hover);
}