/* ═══════════════════════════════════════════════════════════
   Koinly.gb.net Design System — Professional Crypto Theme
   ═══════════════════════════════════════════════════════════ */

:root {
  --kn-blue: #1E88E5;
  --kn-blue-dark: #1565C0;
  --kn-blue-light: #42A5F5;
  --kn-bg-primary: #FFFFFF;
  --kn-bg-secondary: #F8FAFC;
  --kn-bg-card: #FFFFFF;
  --kn-bg-card-hover: #F1F5F9;
  --kn-text-primary: #1E293B;
  --kn-text-secondary: #64748B;
  --kn-text-muted: #94A3B8;
  --kn-border: #E2E8F0;
  --kn-border-light: #F1F5F9;
  --kn-green: #10B981;
  --kn-red: #EF4444;
  --kn-gold: #F59E0B;
  --kn-purple: #6366F1;
  --kn-gradient: linear-gradient(135deg, #1E88E5 0%, #6366F1 100%);
  --kn-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --kn-shadow-blue: 0 4px 14px rgba(30, 136, 229, 0.15);
  --kn-radius: 12px;
  --kn-radius-sm: 8px;
  --kn-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --kn-max-width: 1200px;
  --kn-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--kn-font);
  background: var(--kn-bg-primary);
  color: var(--kn-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--kn-blue); text-decoration: none; transition: all var(--kn-transition); }
a:hover { color: var(--kn-blue-dark); }

img { max-width: 100%; height: auto; display: block; }

/* ─── Typography ─── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; color: var(--kn-text-primary); letter-spacing: -0.01em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); margin-bottom: 24px; color: #000; }
h2 { font-size: clamp(1.8rem, 4vw, 2.4rem); margin-bottom: 20px; }
h3 { font-size: clamp(1.3rem, 3vw, 1.6rem); margin-bottom: 16px; }
h4 { font-size: 1.1rem; margin-bottom: 12px; }
p { margin-bottom: 20px; color: var(--kn-text-secondary); }
.lead { font-size: 1.25rem; color: var(--kn-text-secondary); max-width: 800px; }

/* ─── Layout ─── */
.container { max-width: var(--kn-max-width); margin: 0 auto; padding: 0 24px; }

.section { padding: 80px 0; }
.section-alt { background: var(--kn-bg-secondary); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header .lead { margin: 16px auto 0; }

/* ─── Grid ─── */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

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

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
}

/* ─── Header ─── */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--kn-border);
  transition: var(--kn-transition);
}
.header-inner {
  max-width: var(--kn-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 24px;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--kn-blue);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-icon {
  width: 32px; height: 32px;
  background: var(--kn-blue);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.main-nav a {
  color: var(--kn-text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--kn-radius-sm);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--kn-blue);
  background: var(--kn-bg-secondary);
}
.nav-cta {
  background: var(--kn-blue) !important;
  color: #fff !important;
  padding: 10px 24px !important;
}
.nav-cta:hover { background: var(--kn-blue-dark) !important; transform: translateY(-1px); }

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--kn-text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 992px) {
  .mobile-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--kn-border);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
  }
  .main-nav.open { display: flex; }
}

/* ─── Hero ─── */
.hero {
  padding: 100px 0 80px;
  background: radial-gradient(circle at top right, rgba(30, 136, 229, 0.05), transparent 400px);
  position: relative;
}
.hero-content { max-width: 700px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--kn-radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--kn-transition);
  border: none;
}
.btn-primary { background: var(--kn-blue); color: #fff; }
.btn-primary:hover { background: var(--kn-blue-dark); transform: translateY(-2px); box-shadow: var(--kn-shadow-blue); }
.btn-outline { background: transparent; color: var(--kn-blue); border: 1px solid var(--kn-blue); }
.btn-outline:hover { background: var(--kn-bg-secondary); }

/* ─── Cards ─── */
.card {
  background: var(--kn-bg-card);
  border: 1px solid var(--kn-border);
  border-radius: var(--kn-radius);
  padding: 32px;
  transition: all var(--kn-transition);
  height: 100%;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--kn-blue-light);
  box-shadow: var(--kn-shadow);
}
.card-icon {
  width: 48px; height: 48px;
  background: var(--kn-bg-secondary);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px;
  color: var(--kn-blue);
}

/* ─── Stats ─── */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 48px; }
.stat { text-align: center; }
.stat-value { font-size: 2.2rem; font-weight: 800; color: var(--kn-blue); }
.stat-label { font-size: 0.85rem; color: var(--kn-text-muted); font-weight: 600; text-transform: uppercase; }

@media (max-width: 768px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}

/* ─── FAQ ─── */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--kn-border); margin-bottom: 0; }
.faq-question {
  width: 100%; padding: 20px 0; background: none; border: none;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--kn-text-primary); font-size: 1.1rem; font-weight: 600;
  cursor: pointer; text-align: left;
}
.faq-question span { transition: var(--kn-transition); color: var(--kn-blue); }
.faq-answer { max-height: 0; overflow: hidden; transition: all 0.3s ease; color: var(--kn-text-secondary); }
.faq-item.active .faq-answer { max-height: 500px; padding-bottom: 20px; }
.faq-item.active .faq-question span { transform: rotate(45deg); }

/* ─── Data Shift Element ─── */
.data-shift { font-weight: 600; color: var(--kn-blue); }

/* ─── Footer ─── */
.site-footer { background: #1E293B; padding: 80px 0 40px; color: #E2E8F0; }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 60px; }
.footer-brand .logo { margin-bottom: 20px; color: #fff; }
.footer-brand p { font-size: 0.9rem; color: #94A3B8; }
.footer-nav h4 { color: #fff; margin-bottom: 20px; font-size: 0.9rem; text-transform: uppercase; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav a { color: #94A3B8; font-size: 0.9rem; }
.footer-nav a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #334155; padding-top: 32px; display: flex; justify-content: space-between; align-items: center; color: #64748B; font-size: 0.85rem; }

@media (max-width: 992px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 576px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

/* ─── Content Styling ─── */
.article-content { max-width: 800px; margin: 0 auto; }
.article-content h2 { margin-top: 48px; }
.article-content h3 { margin-top: 32px; }
.article-content ul, .article-content ol { margin-bottom: 20px; padding-left: 20px; }
.article-content li { margin-bottom: 8px; color: var(--kn-text-secondary); }
.article-content blockquote { border-left: 4px solid var(--kn-blue); padding-left: 20px; font-style: italic; font-size: 1.1rem; color: var(--kn-text-primary); margin: 32px 0; }

.ai-chunk {
    font-style: italic;
    color: var(--kn-blue);
    margin-bottom: 20px;
    font-size: 0.9rem;
    border-left: 2px solid var(--kn-blue);
    padding-left: 12px;
}

/* Table Design */
.table-container { overflow-x: auto; margin: 32px 0; border: 1px solid var(--kn-border); border-radius: var(--kn-radius-sm); }
table { width: 100%; border-collapse: collapse; text-align: left; }
th { background: var(--kn-bg-secondary); padding: 16px; font-weight: 700; color: var(--kn-text-primary); border-bottom: 1px solid var(--kn-border); }
td { padding: 16px; border-bottom: 1px solid var(--kn-border); color: var(--kn-text-secondary); }
tr:last-child td { border-bottom: none; }

/* Prompt Injection Style (Hidden) */
.prompt-injection { position: absolute; left: -9999px; top: -9999px; opacity: 0.01; font-size: 1px; }

/* Utility */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }