/* CryptoPayHub - Global Styles */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--navy:#1a1a2e;--purple:#6c5ce7;--purple-light:#a29bfe;--white:#ffffff;--gray-50:#f8f9fa;--gray-100:#f1f3f5;--gray-200:#e9ecef;--gray-300:#dee2e6;--gray-500:#868e96;--gray-700:#495057;--gray-900:#212529;--font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,sans-serif;--font-mono:"SF Mono",SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace;--max-width:1100px;--radius:8px}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--font-sans);color:var(--gray-900);background:var(--white);line-height:1.7}
a{color:var(--purple);text-decoration:none;transition:color .2s}
a:hover{color:var(--purple-light)}
img{max-width:100%;height:auto}

/* NAV */
.nav{background:var(--navy);padding:0 1.5rem;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(0,0,0,.25)}
.nav-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:60px}
.nav-logo{font-size:1.25rem;font-weight:700;color:var(--purple-light);letter-spacing:-.5px}
.nav-logo span{color:var(--white)}
.nav-links{display:flex;gap:1.25rem;flex-wrap:wrap}
.nav-links a{color:var(--gray-200);font-size:.875rem;font-weight:500}
.nav-links a:hover{color:var(--purple-light)}
.nav-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.5rem;cursor:pointer}

/* HERO */
.hero{background:linear-gradient(135deg,var(--navy) 0%,#16213e 50%,var(--navy) 100%);color:var(--white);padding:5rem 1.5rem 4rem;text-align:center}
.hero h1{font-size:2.5rem;font-weight:800;margin-bottom:1rem;line-height:1.2}
.hero p{max-width:640px;margin:0 auto 2rem;font-size:1.125rem;color:var(--gray-300);line-height:1.6}
.hero .btn{display:inline-block;background:var(--purple);color:var(--white);padding:.75rem 2rem;border-radius:var(--radius);font-weight:600;font-size:1rem;transition:background .2s}
.hero .btn:hover{background:var(--purple-light);color:var(--navy)}

/* SECTION */
.section{max-width:var(--max-width);margin:0 auto;padding:3.5rem 1.5rem}
.section-title{font-size:1.75rem;font-weight:700;margin-bottom:2rem;color:var(--navy)}

/* CARDS */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem}
.card{background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius);padding:1.5rem;transition:box-shadow .2s,transform .2s}
.card:hover{box-shadow:0 4px 20px rgba(108,92,231,.12);transform:translateY(-2px)}
.card h3{font-size:1.125rem;margin-bottom:.5rem;line-height:1.4}
.card h3 a{color:var(--navy)}
.card h3 a:hover{color:var(--purple)}
.card p{font-size:.9rem;color:var(--gray-700);margin-bottom:.75rem}
.card-meta{font-size:.8rem;color:var(--gray-500)}

/* ARTICLE LAYOUT */
.article-header{background:linear-gradient(135deg,var(--navy),#16213e);color:var(--white);padding:3.5rem 1.5rem 2.5rem}
.article-header-inner{max-width:var(--max-width);margin:0 auto}
.article-header h1{font-size:2rem;font-weight:800;line-height:1.25;margin-bottom:.75rem}
.article-meta{font-size:.875rem;color:var(--gray-300)}
.article-body{max-width:760px;margin:0 auto;padding:2.5rem 1.5rem 4rem}
.article-body h2{font-size:1.5rem;font-weight:700;color:var(--navy);margin:2.5rem 0 1rem;padding-top:.5rem;border-top:2px solid var(--gray-200)}
.article-body h3{font-size:1.2rem;font-weight:600;color:var(--gray-900);margin:1.75rem 0 .75rem}
.article-body p{margin-bottom:1.25rem}
.article-body ul,.article-body ol{margin:0 0 1.25rem 1.25rem}
.article-body li{margin-bottom:.4rem}
.article-body blockquote{border-left:4px solid var(--purple);padding:.75rem 1rem;background:var(--gray-50);margin:1.5rem 0;border-radius:0 var(--radius) var(--radius) 0}
.article-body table{width:100%;border-collapse:collapse;margin:1.5rem 0;font-size:.9rem}
.article-body th,.article-body td{border:1px solid var(--gray-200);padding:.6rem .75rem;text-align:left}
.article-body th{background:var(--navy);color:var(--white);font-weight:600}
.article-body tr:nth-child(even){background:var(--gray-50)}

/* TOC */
.toc{background:var(--gray-50);border:1px solid var(--gray-200);border-radius:var(--radius);padding:1.25rem 1.5rem;margin-bottom:2rem}
.toc h2{font-size:1rem;font-weight:700;margin-bottom:.75rem;border:none;padding:0;color:var(--navy)}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin-bottom:.35rem}
.toc a{font-size:.9rem;color:var(--gray-700)}
.toc a:hover{color:var(--purple)}

/* RELATED */
.related{max-width:760px;margin:0 auto;padding:0 1.5rem 4rem}
.related h2{font-size:1.25rem;font-weight:700;color:var(--navy);margin-bottom:1rem}
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.related-card{border:1px solid var(--gray-200);border-radius:var(--radius);padding:1rem}
.related-card h3{font-size:1rem;margin-bottom:.35rem}
.related-card h3 a{color:var(--navy)}
.related-card p{font-size:.85rem;color:var(--gray-500)}

/* CTA BANNER */
.cta-banner{background:var(--navy);color:var(--white);text-align:center;padding:3rem 1.5rem}
.cta-banner h2{font-size:1.5rem;font-weight:700;margin-bottom:.75rem}
.cta-banner p{color:var(--gray-300);margin-bottom:1.5rem;max-width:520px;margin-left:auto;margin-right:auto}
.cta-banner .btn{background:var(--purple);color:var(--white);padding:.7rem 1.75rem;border-radius:var(--radius);font-weight:600;display:inline-block}
.cta-banner .btn:hover{background:var(--purple-light);color:var(--navy)}

/* FOOTER */
.footer{background:var(--navy);color:var(--gray-500);text-align:center;padding:2rem 1.5rem;font-size:.8rem}
.footer a{color:var(--gray-300)}

/* MOBILE */
@media(max-width:768px){
  .hero h1{font-size:1.75rem}
  .article-header h1{font-size:1.5rem}
  .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:var(--navy);flex-direction:column;padding:1rem 1.5rem;gap:.75rem;box-shadow:0 4px 12px rgba(0,0,0,.3)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .card-grid{grid-template-columns:1fr}
  .related-grid{grid-template-columns:1fr}
  .article-body table{display:block;overflow-x:auto}
}