/* CSS Variables & Reset */
:root {
    --primary-color: #0F172A; /* Deep Navy */
    --secondary-color: #0052FF; /* Bright Crypto Blue */
    --accent-color: #F7931A; /* Bitcoin Orange */
    --text-color: #334155; /* Slate 700 */
    --text-light: #64748B; /* Slate 500 */
    --bg-color: #F8FAFC; /* Very Light Gray/Blue */
    --bg-white: #FFFFFF; /* Pure White */
    --border-color: #E2E8F0; /* Slate 200 */
    --success-color: #10B981;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --max-width: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

.brand {
    display: flex;
    align-items: center;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-decoration: none;
}
a { color: var(--secondary-color); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--primary-color); }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; color: var(--primary-color); margin-bottom: 1rem; line-height: 1.2; }
img { max-width: 100%; height: auto; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.btn { display: inline-block; padding: 12px 24px; border-radius: 6px; font-weight: 600; text-align: center; cursor: pointer; transition: background 0.3s, transform 0.2s; border: none; }
.btn-primary { background: var(--secondary-color); color: #fff; }
.btn-primary:hover { background: #1D4ED8; color: #fff; transform: translateY(-2px); }
.btn-large { padding: 16px 32px; font-size: 1.1rem; }

/* Header & Nav */
.site-header { background: var(--bg-white); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 100; padding: 15px 0; }
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.brand { font-family: var(--font-heading); font-size: 1.5rem; font-weight: 700; color: var(--primary-color); }
.main-nav .nav-links { list-style: none; display: flex; gap: 20px; }
.main-nav a { font-weight: 600; color: var(--text-color); }
.main-nav a:hover { color: var(--secondary-color); }
.header-search { position: relative; }
.header-search input { padding: 8px 12px; border: 1px solid var(--border-color); border-radius: 4px; font-family: var(--font-body); }
.search-results { position: absolute; top: 100%; right: 0; width: 300px; background: #fff; border: 1px solid var(--border-color); border-radius: 4px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); display: none; z-index: 101; max-height: 400px; overflow-y: auto; }
.search-results a { display: block; padding: 10px; border-bottom: 1px solid var(--border-color); color: var(--text-color); }
.search-results a:hover { background: var(--bg-color); }
.mobile-menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

/* Hero */
.hero-section { background: var(--primary-color); color: #fff; padding: 80px 20px; text-align: center; }
.hero-section h1 { color: #fff; font-size: 2.5rem; margin-bottom: 20px; }
.hero-subtitle { font-size: 1.25rem; color: #CBD5E1; margin-bottom: 30px; max-width: 800px; margin-inline: auto; }

/* Layout */
.content-layout { display: grid; grid-template-columns: 1fr 300px; gap: 40px; margin-top: 40px; margin-bottom: 60px; }
.main-column { min-width: 0; }

/* Cards & Grid */
.article-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; }
.article-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 8px; overflow: hidden; transition: box-shadow 0.3s; }
.article-card:hover { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1); }
.article-card-content { padding: 20px; }
.category-tag { display: inline-block; background: var(--bg-color); color: var(--secondary-color); font-size: 0.8rem; font-weight: 700; padding: 4px 8px; border-radius: 4px; margin-bottom: 10px; text-transform: uppercase; }
.article-card h3 { font-size: 1.25rem; margin-bottom: 10px; }
.article-card p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 15px; }
.read-more { font-weight: 600; font-size: 0.9rem; }

/* Hubs */
.hub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.hub-card { background: var(--bg-white); border: 1px solid var(--border-color); padding: 20px; border-radius: 8px; text-align: center; transition: transform 0.2s, box-shadow 0.2s; }
.hub-card:hover { transform: translateY(-5px); box-shadow: 0 10px 15px rgba(0,0,0,0.1); }
.hub-card h3 { margin: 0; font-size: 1.1rem; color: var(--secondary-color); }

/* Article Page */
.article-layout { background: var(--bg-white); padding: 40px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
.breadcrumb { list-style: none; display: flex; gap: 8px; font-size: 0.9rem; color: var(--text-light); margin-bottom: 20px; flex-wrap: wrap; }
.breadcrumb li::after { content: "/"; margin-left: 8px; }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--text-light); }
.article-header h1 { font-size: 2.5rem; margin-bottom: 15px; }
.article-meta { display: flex; gap: 20px; font-size: 0.95rem; color: var(--text-light); margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid var(--border-color); }
.article-body h2 { font-size: 1.75rem; margin-top: 40px; margin-bottom: 15px; }
.article-body h3 { font-size: 1.4rem; margin-top: 30px; margin-bottom: 10px; }
.article-body p { margin-bottom: 20px; font-size: 1.1rem; }
.article-intro { font-size: 1.2rem; font-weight: 300; color: var(--text-color); margin-bottom: 30px; }
.key-takeaways { background: var(--bg-color); border-left: 4px solid var(--accent-color); padding: 20px; margin-bottom: 40px; border-radius: 0 8px 8px 0; }
.key-takeaways h3 { margin-top: 0; color: var(--primary-color); }
.key-takeaways ul { margin-left: 20px; font-size: 1.1rem; }
.key-takeaways li { margin-bottom: 10px; }

/* Inline Newsletter & Author */
.inline-newsletter { background: var(--primary-color); color: #fff; padding: 30px; border-radius: 8px; margin: 40px 0; text-align: center; }
.inline-newsletter h3 { color: #fff; margin-bottom: 10px; }
.inline-newsletter form { display: flex; justify-content: center; gap: 10px; margin-top: 20px; }
.inline-newsletter input { padding: 12px; border: none; border-radius: 4px; width: 60%; font-family: var(--font-body); }
.author-bio-box { display: flex; gap: 20px; background: var(--bg-color); padding: 20px; border-radius: 8px; margin-top: 40px; border: 1px solid var(--border-color); }
.author-avatar { border-radius: 50%; width: 80px; height: 80px; object-fit: cover; }
.bio-text h4 { margin-top: 0; margin-bottom: 5px; }
.bio-text p { font-size: 0.95rem; margin: 0; }

/* Sidebar */
.sidebar-widget { background: var(--bg-white); padding: 25px; border-radius: 8px; border: 1px solid var(--border-color); margin-bottom: 30px; }
.sidebar-widget h3 { font-size: 1.25rem; border-bottom: 2px solid var(--bg-color); padding-bottom: 10px; margin-bottom: 15px; }
.sidebar-newsletter input { width: 100%; padding: 10px; margin-bottom: 10px; border: 1px solid var(--border-color); border-radius: 4px; }
.sidebar-newsletter button { width: 100%; }
.related-articles ul { list-style: none; }
.related-articles li { margin-bottom: 15px; padding-bottom: 15px; border-bottom: 1px solid var(--bg-color); }
.related-articles li:last-child { border: none; margin: 0; padding: 0; }
.related-articles h4 { font-size: 1rem; margin-bottom: 5px; }
.read-time { font-size: 0.8rem; color: var(--text-light); }
.category-list { list-style: none; }
.category-list li { margin-bottom: 10px; }
.category-list a { display: block; padding: 8px; background: var(--bg-color); border-radius: 4px; color: var(--text-color); font-weight: 600; }
.category-list a:hover { background: var(--secondary-color); color: #fff; }

/* Ads Containers */
.ad-container { background: #f1f5f9; text-align: center; padding: 10px; margin: 20px 0; border: 1px dashed #cbd5e1; }
.ad-container::before { content: 'Advertisement'; display: block; font-size: 0.75rem; color: #94a3b8; margin-bottom: 5px; }
.above-fold-ad { min-height: 90px; }
.mid-article-ad { min-height: 250px; }
.sidebar-ad { min-height: 250px; }

/* Social Share */
.social-share { display: flex; align-items: center; gap: 10px; margin: 30px 0; padding-top: 20px; border-top: 1px solid var(--border-color); }
.share-title { font-weight: 600; }
.share-btn { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; color: #fff; font-size: 0.85rem; font-weight: 700; }
.share-btn:hover { color: #fff; transform: translateY(-2px); opacity: 0.9; }
.twitter { background: #1DA1F2; }
.facebook { background: #1877F2; }
.linkedin { background: #0A66C2; }
.copy-link { background: #64748B; width: auto; padding: 0 12px; border-radius: 4px; }

/* Page & 404 */
.page-header { background: var(--primary-color); color: #fff; padding: 60px 20px; text-align: center; margin-bottom: 40px; }
.page-header h1 { color: #fff; margin: 0; }
.page-content { background: var(--bg-white); padding: 40px; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); margin-inline: auto; max-width: 800px; }
.error-page { text-align: center; padding: 100px 20px; }
.error-page h1 { font-size: 6rem; color: var(--secondary-color); margin-bottom: 10px; }
.error-page h2 { font-size: 2rem; margin-bottom: 20px; }

/* Footer */
.site-footer { background: var(--primary-color); color: #CBD5E1; padding: 60px 0 20px; margin-top: 60px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-section h3, .footer-section h4 { color: #fff; margin-bottom: 20px; }
.footer-section a { color: #CBD5E1; }
.footer-section a:hover { color: #fff; text-decoration: underline; }
.footer-section ul { list-style: none; }
.footer-section li { margin-bottom: 10px; }
.newsletter-form { display: flex; gap: 10px; }
.newsletter-form input { padding: 10px; border: none; border-radius: 4px; flex: 1; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; font-size: 0.9rem; }
.visitor-counter { background: rgba(255,255,255,0.1); padding: 5px 10px; border-radius: 4px; }

/* Cookie Consent */
.cookie-consent { position: fixed; bottom: -100%; left: 0; right: 0; background: var(--bg-white); padding: 20px; box-shadow: 0 -4px 10px rgba(0,0,0,0.1); display: flex; justify-content: space-between; align-items: center; transition: bottom 0.5s ease; z-index: 1000; }
.cookie-consent.show { bottom: 0; }
.cookie-consent p { margin: 0; max-width: 80%; font-size: 0.95rem; }

/* Responsive */
@media (max-width: 768px) {
    .content-layout { grid-template-columns: 1fr; }
    .header-inner { position: relative; }
    .main-nav { display: none; width: 100%; margin-top: 15px; }
    .main-nav.active { display: block; }
    .main-nav .nav-links { flex-direction: column; gap: 10px; }
    .mobile-menu-toggle { display: block; }
    .hamburger { display: block; width: 25px; height: 3px; background: var(--primary-color); position: relative; }
    .hamburger::before, .hamburger::after { content: ''; position: absolute; width: 100%; height: 100%; background: var(--primary-color); left: 0; }
    .hamburger::before { top: -8px; }
    .hamburger::after { bottom: -8px; }
    .header-search { display: none; }
    .hero-section h1 { font-size: 2rem; }
    .article-layout { padding: 20px; }
    .footer-inner { grid-template-columns: 1fr; }
    .inline-newsletter form { flex-direction: column; }
    .inline-newsletter input { width: 100%; }
    .cookie-consent { flex-direction: column; gap: 15px; text-align: center; }
    .cookie-consent p { max-width: 100%; }
}