/* CSS Reset & Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --accent: #f59e0b;
    --danger: #ef4444;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero */
.hero {
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    font-size: 13px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 24px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.hero h2 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}

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

/* Filters */
.filters {
    padding: 20px 0;
    position: sticky;
    top: 73px;
    background: var(--bg-primary);
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.filter-wrapper {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
}

.filter-wrapper::-webkit-scrollbar {
    display: none;
}

.filter-btn {
    padding: 10px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

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

/* Main Content */
.main-content {
    padding: 40px 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-header h3 {
    font-size: 24px;
    font-weight: 600;
}

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

/* News Grid */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.news-card-header {
    padding: 20px 20px 0;
}

.news-category {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-vulnerability { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }
.category-research { background: rgba(99, 102, 241, 0.2); color: #a5b4fc; }
.category-industry { background: rgba(16, 185, 129, 0.2); color: #6ee7b7; }
.category-policy { background: rgba(245, 158, 11, 0.2); color: #fcd34d; }
.category-tools { background: rgba(139, 92, 246, 0.2); color: #c4b5fd; }

.news-date {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 8px;
}

.news-card-body {
    padding: 16px 20px;
}

.news-card h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card p {
    font-size: 14px;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.read-more {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
}

/* Loading */
.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

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

/* Newsletter */
.newsletter-section {
    margin: 60px 0;
}

.newsletter-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
}

.newsletter-content h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

.newsletter-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.newsletter-form {
    display: flex;
    gap: 12px;
    max-width: 400px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.newsletter-form input {
    flex: 1;
    min-width: 200px;
    padding: 14px 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.newsletter-form button {
    padding: 14px 28px;
    background: var(--primary);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-form button:hover {
    background: var(--primary-dark);
}

/* About */
.about-section {
    margin: 40px 0;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 24px;
}

.about-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    text-align: center;
}

.about-card > p {
    color: var(--text-secondary);
    text-align: center;
    max-width: 700px;
    margin: 0 auto 40px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.feature {
    text-align: center;
    padding: 24px;
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
}

.feature h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

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

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 40px 0 24px;
    margin-top: 60px;
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-primary);
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border);
        padding: 16px;
        flex-direction: column;
    }

    .nav.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-stats {
        gap: 32px;
    }

    .stat-number {
        font-size: 28px;
    }

    .news-grid {
        grid-template-columns: 1fr;
    }

    .filters {
        top: 65px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero h2 {
        font-size: 28px;
    }

    .hero p {
        font-size: 16px;
    }

    .section-header h3 {
        font-size: 20px;
    }

    .filter-btn {
        padding: 8px 14px;
        font-size: 13px;
    }
}