/* Professional Crypto Blog - Clean & Secure Design */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
:root {
  --bg: #ffffff; --text: #0f172a; --muted: #64748b; --border: #e2e8f0;
  --surface: #f8fafc; --surface-2: #f1f5f9;
  --brand: #2563eb; --brand-600: #1d4ed8; --brand-700: #1e40af;
  --success: #059669; --warning: #d97706; --danger: #dc2626;
  --radius: 12px; --shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 8px 32px rgba(15, 23, 42, 0.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a; --text: #f1f5f9; --muted: #94a3b8; --border: #334155;
    --surface: #1e293b; --surface-2: #334155;
    --brand: #60a5fa; --brand-600: #3b82f6; --brand-700: #2563eb;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  }
}
/* Manual dark mode toggle */
html[data-theme="dark"] {
  --bg: #0f172a; --text: #f1f5f9; --muted: #94a3b8; --border: #334155;
  --surface: #1e293b; --surface-2: #334155;
  --brand: #60a5fa; --brand-600: #3b82f6; --brand-700: #2563eb;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.7;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased;
  min-height: 100vh; overflow-x: hidden; width: 100%;
  font-weight: 400;
}

* {
  box-sizing: border-box;
}

img, picture {
  max-width: 100%;
  height: auto;
  display: block;
}
a{color:var(--brand-700);text-decoration:none}
a:hover,a:focus{text-decoration:underline}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:1rem;top:1rem;width:auto;height:auto;background:#111;color:#fff;padding:.5rem .75rem;border-radius:.5rem;z-index:1000}

.container{max-width:1160px;margin:0 auto;padding:0 1rem;width:100%;box-sizing:border-box}

/* Header & nav */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}
html[data-theme="dark"] .site-header {
  background: rgba(15, 23, 42, 0.9);
}
.header-bar{display:flex;align-items:center;gap:.75rem;padding:.75rem 0}
.brand{font-weight:800;font-size:1.25rem;color:var(--text)}
.brand-dot{color:var(--brand)}
.icon-btn{background:transparent;border:1px solid var(--border);border-radius:10px;color:var(--text);padding:.4rem .6rem;cursor:pointer}
.icon-btn:focus-visible{outline:3px solid var(--brand);outline-offset:2px}

.menu{list-style:none;display:flex;gap:.25rem;margin:0;padding:0}
.menu a{display:inline-block;padding:.45rem .65rem;border-radius:10px}
.menu a:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
#menu[data-collapsible]{display:flex}
#nav-toggle{display:none}
@media (max-width:768px){
  #nav-toggle{display:inline-block}
  #menu[data-collapsible]{display:none;position:absolute;left:0;right:0;top:56px;background:var(--surface);border-block:1px solid var(--border);padding:.5rem 1rem}
  #menu[data-open="true"]{display:block}
  .menu{flex-direction:column}
}

/* Hero */
.hero {
  padding: 4rem 0 2rem; text-align: center;
  background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.hero-mascot {
  border-radius: 50%;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
}

.hero-mascot:hover {
  transform: scale(1.05);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; line-height: 1.1;
  margin: 0 0 1rem; background: linear-gradient(135deg, var(--brand), var(--brand-700));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .sub {
  font-size: 1.25rem; color: var(--muted); margin: 0; max-width: 600px;
  margin-left: auto; margin-right: auto;
}

/* Sections */
.section-header{display:flex;align-items:end;justify-content:space-between;gap:1rem;margin:2rem 0 1rem}
.section-header p{margin:0;color:var(--muted)}

/* Grid helpers */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
@media (max-width:1024px){.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:768px){.grid-4{grid-template-columns:1fr}}

/* Affiliate cards */
.affiliate-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem; display: grid; gap: 1rem;
  box-shadow: var(--shadow); transition: all 0.3s ease;
  position: relative; overflow: hidden;
}
.affiliate-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: linear-gradient(90deg, var(--brand), var(--brand-700));
  transform: scaleX(0); transition: transform 0.3s ease;
}
.affiliate-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
}
.affiliate-card:hover::before {
  transform: scaleX(1);
}
.affiliate-card h3{margin:.25rem 0;font-size:1.05rem}
.affiliate-card ul{margin:0;padding-left:1rem;color:var(--muted)}
.affiliate-note{font-size:.9rem;color:var(--muted)}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:.6rem .9rem;border-radius:12px;border:1px solid var(--brand-700);transition:transform .06s ease, background .2s ease}
.btn:hover,.btn:focus-visible{background:var(--brand-600);text-decoration:none;transform:translateY(-1px)}

/* Blog layout */
.blog .content-grid{display:grid;grid-template-columns:1fr 320px;gap:1rem}
@media (max-width:1024px){.blog .content-grid{grid-template-columns:1fr}}
.search-wrap input[type="search"]{width:260px;max-width:100%;border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:12px;padding:.6rem .8rem}
.search-wrap input:focus-visible{outline:3px solid var(--brand);outline-offset:2px}

.posts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
@media (max-width:1024px){.posts-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:768px){.posts-grid{grid-template-columns:1fr}}

.post-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; display: grid;
  box-shadow: var(--shadow); transition: all 0.3s ease;
  position: relative;
}
.post-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg);
  border-color: var(--brand);
}
.post-card img {
  transition: transform 0.3s ease;
}
.post-card:hover img {
  transform: scale(1.05);
}
.post-body{padding:.9rem}
.post-body h2{margin:0 0 .3rem;font-size:1.1rem}
.post-meta{color:var(--muted);margin:0 0 .5rem;font-size:.95rem}
.post-tags{display:flex;flex-wrap:wrap;gap:.25rem;margin:0 0 .5rem}
.post-tags .chip{display:inline-block;font-size:.85rem;color:var(--brand-700);background:color-mix(in srgb, var(--brand) 12%, transparent);padding:.15rem .5rem;border-radius:999px}

/* Blog Article Layout */
.blog-article {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 3rem;
  align-items: start;
  width: 100%;
  box-sizing: border-box;
}

.article-header {
  grid-column: 1 / -1;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border);
}

.article-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.article-meta {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.article-meta time {
  font-weight: 500;
}

.read-time, .category {
  padding: 0.25rem 0.5rem;
  background: var(--bg-secondary);
  border-radius: 4px;
  font-size: 0.8rem;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: color-mix(in srgb, var(--brand) 12%, transparent);
  color: var(--brand-700);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.article-content {
  line-height: 1.8;
  font-size: 1.05rem;
  color: var(--text);
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 2.5rem 0 1.25rem 0;
  color: var(--text);
  letter-spacing: -0.025em;
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 2rem 0 1rem 0;
  color: var(--text);
  letter-spacing: -0.015em;
}

/* Article intro with mascot */
.intro-with-mascot {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.article-mascot {
  border-radius: 50%;
  box-shadow: var(--shadow);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.article-mascot:hover {
  transform: scale(1.1);
}

.lead {
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--muted);
  margin: 0;
  line-height: 1.7;
  flex: 1;
}

@media (max-width: 768px) {
  .intro-with-mascot {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
  }
  
  .lead {
    text-align: center;
  }
}

.warning-box, .info-box, .risk-section, .checklist {
  background: var(--card-bg);
  border-left: 4px solid var(--brand);
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 0 8px 8px 0;
  box-shadow: var(--shadow-sm);
}

.warning-box {
  border-left-color: #f59e0b;
  background: rgba(245, 158, 11, 0.05);
}

.risk-section {
  border-left-color: #ef4444;
  background: rgba(239, 68, 68, 0.05);
}

.tools-section {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 12px;
  margin: 2rem 0;
}

.tool-recommendation {
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--card-bg);
  border-radius: 8px;
}

.tool-recommendation h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.update-note {
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: 8px;
  margin-top: 3rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Article Sidebar */
.article-sidebar {
  position: sticky;
  top: 2rem;
  height: fit-content;
}

.toc {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: 12px;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.toc h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li {
  margin-bottom: 0.5rem;
}

.toc a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.toc a:hover {
  color: var(--primary);
}

/* Referral Section Styles */
.referral-card {
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%);
  border: 2px solid var(--brand);
  border-radius: 16px;
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.referral-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brand), var(--brand-600), var(--brand-700));
}

.referral-content {
  display: grid;
  grid-template-columns: minmax(300px, 400px) 1fr;
  gap: 2rem;
  align-items: center;
  width: 100%;
  overflow: hidden;
}

.referral-image {
  border-radius: 12px;
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 400px;
  height: auto;
  object-fit: cover;
}

.referral-text h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--text);
  font-size: 1.5rem;
}

.referral-text ul {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.referral-text li {
  margin-bottom: 0.5rem;
  color: var(--muted);
}

.referral-cta {
  margin-top: 1.5rem;
}

.referral-btn {
  display: inline-flex;
  flex-direction: column;
  background: linear-gradient(135deg, var(--brand), var(--brand-600));
  color: white;
  padding: 1rem 2rem;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.referral-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.referral-btn:hover::before {
  left: 100%;
}

.referral-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

.btn-text {
  font-size: 1.1rem;
  font-weight: 700;
}

.btn-subtext {
  font-size: 0.9rem;
  opacity: 0.9;
  font-weight: 400;
}

.referral-note {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

.additional-tools {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.additional-tools h3 {
  margin-bottom: 1rem;
  color: var(--text);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.tool-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--surface);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all 0.2s ease;
}

.tool-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.tool-item img {
  border-radius: 8px;
  flex-shrink: 0;
}

.tool-item h4 {
  margin: 0 0 0.25rem 0;
  font-size: 1rem;
  color: var(--text);
}

.tool-item p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .blog-article {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 0 1rem;
  }
  
  .article-sidebar {
    position: static;
    order: -1;
  }

  .referral-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }

  .referral-image {
    max-width: 100%;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .blog-article {
    padding: 0 1rem;
  }
  
  .article-header h1 {
    font-size: 1.75rem;
    line-height: 1.3;
    text-align: center;
  }
  
  .article-meta {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
  }

  .article-tags {
    justify-content: center;
  }

  .referral-card {
    padding: 1.5rem;
    margin: 1.5rem auto;
    max-width: 500px;
  }

  .referral-content {
    gap: 1rem;
  }

  .referral-image {
    max-width: 280px;
  }

  .tool-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .tool-item {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }

  .referral-btn {
    padding: 0.875rem 1.5rem;
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
  }

  .newsletter {
    max-width: 350px;
  }

  .toc {
    text-align: left;
  }
}

/* Sidebar */
.sidebar{display:grid;gap:1rem;align-content:start}
.chip-list{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;padding:0;margin:0}
.chip-list li a{display:inline-block;padding:.25rem .55rem;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--text)}
.recent-list{list-style:none;padding:0;margin:0;display:grid;gap:.4rem}
.recent-list a{color:var(--text)}

/* Newsletter */
.newsletter {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  max-width: 400px;
  margin: 0 auto;
}

.newsletter h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.newsletter p {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.newsletter form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}

.newsletter label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.25rem;
  align-self: flex-start;
}

.newsletter input {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  width: 100%;
  transition: border-color 0.2s ease;
}

.newsletter input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.newsletter .btn {
  width: 100%;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
}

.form-msg {
  margin: 0.5rem 0 0 0;
  font-size: 0.9rem;
  text-align: center;
}

/* About */
.about{margin-top:2rem}
.about-box{display:grid;grid-template-columns:96px 1fr;gap:1rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}
.about-avatar{border-radius:50%}

/* Footer */
.site-footer{border-top:1px solid var(--border);margin-top:3rem;padding:2rem 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr;gap:1rem}
@media (max-width:768px){.footer-grid{grid-template-columns:1fr}}
.footer-title{margin:0 0 .4rem}
.footer-grid ul{margin:0;padding-left:1rem}
.muted{color:var(--muted)}
.small{font-size:.9rem}
copyright,.copyright{text-align:center;color:var(--muted);margin-top:1rem}

/* Code & tables (future tutorials) */
pre,code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace}
pre{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem;overflow:auto}
code{background:color-mix(in srgb, var(--brand) 10%, transparent);padding:.1rem .3rem;border-radius:6px}

/* Focus visibility */
:focus-visible{outline:3px solid var(--brand);outline-offset:2px}