:root{--navy:#034FC0;--navy-mid:#1A72D8;--gold:#6DB4FF;--gold-light:#A8D0FF;--bg:#F0F5FB;--bg-section:#E0ECF8;--card:#FFFFFF;--text:#001A40;--text2:#3A5A80;--text3:#7A9BBF;--border:#C8DDEF;}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;line-height:1.7;color:var(--text);background:var(--bg);}
header{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-mid) 100%);color:#fff;padding:1rem 2rem;position:sticky;top:0;z-index:1000;box-shadow:0 2px 8px rgba(3,79,192,.15);}
.header-content{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;}
.logo{font-size:1.4rem;font-weight:700;color:#fff;text-decoration:none;display:flex;align-items:center;gap:.6rem;}
.logo-mark{width:36px;height:36px;border-radius:9px;}
.nav-links{display:flex;gap:2rem;}
.nav-links a{color:#fff;text-decoration:none;font-size:.95rem;font-weight:500;transition:opacity .3s;}
.nav-links a:hover{opacity:.8;}
@media(max-width:600px){.nav-links{gap:1.2rem;}.nav-links a:first-child{display:none;}}

/* blog index */
.blog-hero{max-width:800px;margin:0 auto;padding:3rem 2rem 2rem;text-align:center;}
.hero-banner{display:block;max-width:440px;width:100%;height:auto;margin:0 auto 2rem;border-radius:16px;}
.blog-hero h1{font-size:clamp(2rem,5vw,3rem);color:var(--navy);font-weight:800;margin-bottom:1rem;}
.blog-hero p{font-size:1.15rem;color:var(--text2);max-width:600px;margin:0 auto;}
.post-list{padding:2rem;}
.post-list-inner{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem;}
.post-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:1.75rem;text-decoration:none;color:inherit;transition:all .3s;display:flex;flex-direction:column;}
.post-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(3,79,192,.12);border-color:var(--gold);}
.post-card h2{font-size:1.25rem;color:var(--navy);font-weight:700;margin-bottom:.75rem;line-height:1.35;}
.post-card p{color:var(--text2);font-size:.98rem;flex:1;}
.read-more{color:var(--navy-mid);font-weight:700;font-size:.9rem;margin-top:1rem;}

/* article */
.post{padding:2.5rem 2rem 1rem;}
.post-inner{max-width:720px;margin:0 auto;}
.breadcrumb{font-size:.85rem;color:var(--text3);margin-bottom:1.5rem;}
.breadcrumb a{color:var(--navy-mid);text-decoration:none;}
.breadcrumb a:hover{text-decoration:underline;}
.post h1{font-size:clamp(1.9rem,4.5vw,2.6rem);color:var(--navy);font-weight:800;line-height:1.25;margin-bottom:.75rem;}
.post-meta{color:var(--text3);font-size:.9rem;font-weight:600;margin-bottom:2.5rem;text-transform:uppercase;letter-spacing:.5px;}
.post-body h2{font-size:1.6rem;color:var(--navy);font-weight:700;margin:2.5rem 0 1rem;line-height:1.3;}
.post-body h3{font-size:1.25rem;color:var(--text);font-weight:700;margin:1.75rem 0 .75rem;}
.post-body p{margin-bottom:1.25rem;font-size:1.08rem;color:#12294d;}
.post-body ul,.post-body ol{margin:0 0 1.25rem 1.5rem;}
.post-body li{margin-bottom:.6rem;font-size:1.08rem;color:#12294d;}
.post-body blockquote{border-left:4px solid var(--gold);background:var(--bg-section);padding:1rem 1.5rem;margin:1.5rem 0;border-radius:0 8px 8px 0;font-style:italic;color:var(--text2);}
.post-body strong{color:var(--text);font-weight:700;}
.post-body code{background:var(--bg-section);padding:.15rem .4rem;border-radius:5px;font-size:.95em;}
.post-body a{color:var(--navy-mid);}

/* in-article app cta */
.app-cta{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-mid) 100%);color:#fff;border-radius:16px;padding:2.25rem;margin:3rem 0 2rem;text-align:center;}
.app-cta h3{font-size:1.5rem;font-weight:800;margin-bottom:.75rem;}
.app-cta p{opacity:.95;margin-bottom:1.5rem;max-width:480px;margin-left:auto;margin-right:auto;}
.store-badge-link{display:inline-block;transition:transform .3s;}
.store-badge-link:hover{transform:scale(1.05);}
.store-badge{height:54px;width:auto;}

/* related */
.related{border-top:1px solid var(--border);padding-top:2rem;margin-bottom:2rem;}
.related h3{font-size:1.2rem;color:var(--navy);font-weight:700;margin-bottom:1rem;}
.related ul{list-style:none;}
.related li{margin-bottom:.75rem;}
.related a{color:var(--navy-mid);text-decoration:none;font-weight:600;font-size:1.05rem;}
.related a:hover{text-decoration:underline;}

footer{background:var(--text);color:#fff;padding:3rem 2rem;text-align:center;font-size:.9rem;}
.footer-links{margin-bottom:1rem;display:flex;justify-content:center;gap:1.75rem;flex-wrap:wrap;}
.footer-links a{color:var(--gold-light);text-decoration:none;}
.footer-links a:hover{opacity:.8;}
.copyright{opacity:.7;margin-top:1rem;}