/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #222240;
    --text-primary: #e8e8f0;
    --text-secondary: #9898b0;
    --text-muted: #6a6a80;
    --accent: #6c63ff;
    --accent-glow: rgba(108, 99, 255, 0.3);
    --accent-secondary: #00d4aa;
    --border: rgba(255, 255, 255, 0.06);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --radius: 16px;
    --radius-sm: 10px;
}

/* ===== Reset ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== Layout ===== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main {
    flex: 1;
    padding: 40px 0;
}

/* ===== Header ===== */
.header {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
    border-bottom: 1px solid var(--border);
    padding: 24px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 16px var(--accent-glow);
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-tagline {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.5px;
}

/* ===== Loading ===== */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

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

/* ===== News Grid ===== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* ===== News Card ===== */
.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.news-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
    opacity: 0;
    transition: opacity 0.3s;
}

.news-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(108, 99, 255, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow), 0 0 30px var(--accent-glow);
}

.news-card:hover::before {
    opacity: 1;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.card-source {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--accent);
    background: rgba(108, 99, 255, 0.1);
    padding: 4px 10px;
    border-radius: 6px;
}

.card-date {
    font-size: 12px;
    color: var(--text-muted);
}

.card-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 10px;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-summary {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 14px;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    font-size: 11px;
    color: var(--accent-secondary);
    background: rgba(0, 212, 170, 0.1);
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 500;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 48px;
}

.page-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.page-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.page-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.page-info {
    color: var(--text-muted);
    font-size: 14px;
}

/* ===== Empty ===== */
.empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    color: var(--text-muted);
    gap: 16px;
}

/* ===== Article Detail ===== */
.article-detail {
    max-width: 800px;
    margin: 0 auto;
}

.back-link {
    display: inline-block;
    color: var(--accent);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    transition: opacity 0.2s;
}

.back-link:hover {
    opacity: 0.7;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.article-source-badge {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--accent);
    background: rgba(108, 99, 255, 0.1);
    padding: 6px 14px;
    border-radius: 8px;
}

.article-date {
    font-size: 13px;
    color: var(--text-muted);
}

.article-title {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.article-summary-text {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.article-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-primary);
}

.article-content h1,
.article-content h2,
.article-content h3 {
    margin: 24px 0 12px;
    font-weight: 700;
}

.article-content h2 { font-size: 24px; }
.article-content h3 { font-size: 20px; }

.article-content p {
    margin-bottom: 16px;
}

.article-content ul {
    margin: 12px 0;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content strong {
    color: var(--accent-secondary);
}

/* ===== Footer ===== */
.footer {
    padding: 32px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    border-top: 1px solid var(--border);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: 8px;
    }
    .news-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .article-title {
        font-size: 24px;
    }
    .article-summary-text {
        font-size: 16px;
    }
}