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

:root {
    --blue: #1a6fdf;
    --blue-light: #3b8ef3;
    --blue-dark: #1250a8;
    --text: #1a1a2e;
    --text-secondary: #5a6a80;
    --bg: #ffffff;
    --bg-light: #f4f7fc;
    --border: #dde4ef;
    --radius: 12px;
}

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

/* NAV */
nav {
    position: sticky;
    top: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: 0 24px;
}
.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--blue);
    letter-spacing: -0.5px;
    text-decoration: none;
}
.logo span { color: var(--text); }
.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--blue); }
.nav-links a.active { color: var(--blue); }
.nav-cta {
    background: var(--blue);
    color: white !important;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600 !important;
}
.nav-cta:hover { background: var(--blue-dark); color: white !important; }

/* BUTTONS */
.btn-primary {
    background: var(--blue);
    color: white;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.2s;
    display: inline-block;
}
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-white {
    background: white;
    color: var(--blue);
    padding: 14px 36px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

/* SECTION TITLES */
.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}
.section-sub {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-size: 1.05rem;
}

/* BLOG HERO (index + article header) */
.blog-hero {
    background: linear-gradient(135deg, #f0f5ff 0%, #e8f0fe 50%, #f4f7fc 100%);
    padding: 56px 24px 48px;
}
.blog-hero-inner {
    max-width: 760px;
    margin: 0 auto;
}
.breadcrumb {
    display: inline-block;
    color: var(--blue);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 20px;
}
.breadcrumb:hover { text-decoration: underline; }
.article-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 0.2px;
}
.blog-hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    line-height: 1.25;
    color: var(--text);
    letter-spacing: -0.5px;
}
.blog-hero.blog-index { text-align: center; }
.blog-hero.blog-index .blog-hero-inner { max-width: 640px; }
.blog-hero.blog-index h1 { font-size: clamp(2rem, 5vw, 3rem); }
.blog-hero.blog-index p { color: var(--text-secondary); font-size: 1.1rem; margin-top: 16px; }

/* BLOG INDEX GRID */
.blog-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    padding: 64px 24px 96px;
}
.blog-card {
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 26px;
    text-decoration: none;
    color: var(--text);
    display: block;
    background: white;
    transition: all 0.25s;
}
.blog-card:hover {
    border-color: var(--blue);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(26,111,223,0.12);
}
.blog-card .blog-date {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.3px;
    margin-bottom: 10px;
    display: block;
}
.blog-card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.2px;
}
.blog-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 14px;
}
.blog-card .blog-link {
    color: var(--blue);
    font-weight: 600;
    font-size: 0.88rem;
}

/* ARTICLE BODY */
.article-body {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px 0;
}
.article-body h2 {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 40px 0 16px;
    letter-spacing: -0.3px;
    color: var(--text);
}
.article-body h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 28px 0 10px;
}
.article-body p {
    margin-bottom: 18px;
    color: var(--text);
    font-size: 1.05rem;
}
.article-body ul, .article-body ol {
    margin: 0 0 20px 22px;
}
.article-body li {
    margin-bottom: 8px;
    color: var(--text);
    font-size: 1.05rem;
}
.article-body a { color: var(--blue); text-decoration: underline; }
.article-body a:hover { color: var(--blue-dark); }
.article-body strong { color: var(--text); }

/* RELATED ARTICLES */
.related {
    max-width: 720px;
    margin: 24px auto 0;
    padding: 32px 24px 64px;
    border-top: 1px solid var(--border);
}
.related h2 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 20px;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}
.related-card {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 20px;
    text-decoration: none;
    color: var(--text);
    display: block;
    background: var(--bg-light);
    transition: all 0.2s;
    font-weight: 600;
    font-size: 0.95rem;
}
.related-card:hover { border-color: var(--blue); }
.related-card span {
    display: block;
    color: var(--blue);
    font-weight: 600;
    font-size: 0.85rem;
    margin-top: 8px;
}

/* CTA */
.cta-section {
    background: linear-gradient(135deg, var(--blue) 0%, var(--blue-light) 100%);
    padding: 72px 24px;
    text-align: center;
}
.cta-section h2 {
    font-size: 2rem;
    font-weight: 800;
    color: white;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.cta-section p {
    color: rgba(255,255,255,0.85);
    font-size: 1.1rem;
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}
.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.cta-phone {
    color: white;
    text-decoration: underline;
    font-weight: 600;
}

/* FOOTER */
footer {
    background: var(--text);
    color: rgba(255,255,255,0.7);
    padding: 40px 24px;
    text-align: center;
    font-size: 0.9rem;
}
footer a { color: rgba(255,255,255,0.7); text-decoration: none; }
footer a:hover { color: white; }

@media (max-width: 640px) {
    .nav-links { display: none; }
    .blog-hero { padding: 40px 16px 36px; }
}