:root {
    --bg-primary: #0a0a0c;
    --bg-secondary: #16161a;
    --bg-tertiary: #1f1f24;
    --text-primary: #ffffff;
    --text-secondary: #a0a0ab;
    --accent-color: #ff3366;
    --accent-hover: #ff4d7a;
    --border-color: #2a2a35;
    --glass-bg: rgba(22, 22, 26, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --transition: all 0.25s ease;
}

[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f3f5;
    --text-primary: #111111;
    --text-secondary: #666666;
    --border-color: #e5e5e5;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-text {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.brand-highlight {
    color: var(--accent-color);
}

.nav-actions {
    display: flex;
    gap: 1rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--accent-color);
}

/* Sidebar */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.sidebar {
    position: fixed;
    top: 0;
    left: -300px;
    width: 280px;
    height: 100%;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    z-index: 1001;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.sidebar.active {
    transform: translateX(300px);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-links {
    list-style: none;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
}

.sidebar-section-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    margin-top: 1rem;
    margin-bottom: -0.5rem;
}
.sidebar-section-title:first-child {
    margin-top: 0;
}

.sidebar-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

.sidebar-links a:hover {
    color: var(--accent-color);
}

/* Ticker */
.ticker-container {
    display: flex;
    align-items: center;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 5%;
    overflow: hidden;
}

.ticker-label {
    background-color: var(--accent-color);
    color: #fff;
    padding: 0.2rem 0.8rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    margin-right: 1rem;
    flex-shrink: 0;
    z-index: 2;
}

.ticker-wrap {
    flex-grow: 1;
    overflow: hidden;
    position: relative;
    white-space: nowrap;
}

.ticker {
    display: flex;
    white-space: nowrap;
    animation: ticker-scroll 120s linear infinite;
    padding-left: 2rem;
}

.ticker:hover {
    animation-play-state: paused;
}

.ticker-item {
    display: inline-block;
    padding: 0 2rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s;
}

.ticker-item:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.ticker-item::after {
    content: "•";
    color: var(--accent-color);
    position: absolute;
    margin-left: 1rem;
}

.ticker-item:last-child::after {
    display: none;
}

@keyframes ticker-scroll {
    0% { transform: translate3d(0, 0, 0); }
    100% { transform: translate3d(-100%, 0, 0); }
}

/* Categories */
.category-tabs-container {
    overflow-x: auto;
    background: var(--bg-primary);
    padding: 1rem 5%;
    border-bottom: 1px solid var(--border-color);
    scrollbar-width: none; /* Firefox */
}
.category-tabs-container::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.category-tabs {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
}

.tab {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    padding-bottom: 0.5rem;
    white-space: nowrap;
    position: relative;
    transition: var(--transition);
}

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

.tab.active {
    color: var(--text-primary);
    font-weight: 600;
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 3px 3px 0 0;
}

/* Main Content */
.main-content {
    padding: 3rem 5%;
    max-width: 1600px;
    margin: 0 auto;
    min-height: 70vh;
}

.feed-header {
    margin-bottom: 2.5rem;
}

.feed-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.feed-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Loader */
.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
    color: var(--text-secondary);
}

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

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

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

/* Featured Article overrides */
.articles-grid .article-card:first-child {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
    background: transparent;
    border: none;
}
.articles-grid .article-card:first-child .article-image-container {
    height: 450px;
    border-radius: 12px;
}
.articles-grid .article-card:first-child .article-content {
    padding: 2rem 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.articles-grid .article-card:first-child .article-title {
    font-size: 2.5rem;
}
.articles-grid .article-card:first-child .article-desc {
    font-size: 1.1rem;
    -webkit-line-clamp: 4;
}

@media (max-width: 900px) {
    .articles-grid .article-card:first-child {
        grid-template-columns: 1fr;
        gap: 0;
        background: var(--bg-secondary);
        border: 1px solid var(--border-color);
    }
    .articles-grid .article-card:first-child .article-image-container {
        height: 250px;
        border-radius: 12px 12px 0 0;
    }
    .articles-grid .article-card:first-child .article-content {
        padding: 1.5rem;
    }
    .articles-grid .article-card:first-child .article-title {
        font-size: 1.5rem;
    }
}


/* Article Card */
.article-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    position: relative;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border-color: var(--glass-border);
}

[data-theme="light"] .article-card:hover {
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.article-image-container {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-tertiary);
}

.article-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.article-card:hover .article-image {
    transform: scale(1.05);
}

.article-source-badge {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    color: #fff;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.article-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: auto;
}

.article-time {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.article-time .material-icons-round {
    font-size: 1rem;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 5%;
    text-align: center;
    margin-top: 4rem;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 1rem;
}