/* ═══════════════════════════════════════════════════════════
   Kraken Design System — Dark Crypto Exchange Theme
   ═══════════════════════════════════════════════════════════ */

:root {
  --kr-purple: #5741D9;
  --kr-purple-dark: #4530B8;
  --kr-purple-light: #7B68EE;
  --kr-bg-primary: #0B0B1A;
  --kr-bg-secondary: #12122A;
  --kr-bg-card: #1A1A3E;
  --kr-bg-card-hover: #222255;
  --kr-text-primary: #FFFFFF;
  --kr-text-secondary: #A8A8C8;
  --kr-text-muted: #6E6E9A;
  --kr-border: rgba(87, 65, 217, 0.2);
  --kr-border-light: rgba(255, 255, 255, 0.08);
  --kr-green: #2ECC71;
  --kr-red: #E74C3C;
  --kr-gold: #F0B90B;
  --kr-blue: #3498DB;
  --kr-gradient: linear-gradient(135deg, #5741D9 0%, #3498DB 100%);
  --kr-gradient-dark: linear-gradient(135deg, #1A1A3E 0%, #0B0B1A 100%);
  --kr-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --kr-shadow-purple: 0 4px 20px rgba(87, 65, 217, 0.15);
  --kr-radius: 12px;
  --kr-radius-sm: 8px;
  --kr-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --kr-max-width: 1200px;
  --kr-transition: 0.2s ease;
}

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

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

body {
  font-family: var(--kr-font);
  background: var(--kr-bg-primary);
  color: var(--kr-text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--kr-purple-light); text-decoration: none; transition: color var(--kr-transition); }
a:hover { color: var(--kr-purple); }

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

/* ─── Typography ─── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; color: var(--kr-text-primary); }
h1 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 20px; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin-bottom: 16px; }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); margin-bottom: 12px; }
h4 { font-size: 1.1rem; margin-bottom: 8px; }
p { margin-bottom: 16px; color: var(--kr-text-secondary); }
.lead { font-size: 1.15rem; color: var(--kr-text-secondary); max-width: 640px; }

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

.section { padding: 80px 0; }
.section-alt { background: var(--kr-bg-secondary); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header .lead { margin: 12px 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: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
}

/* ─── Header ─── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11, 11, 26, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--kr-border-light);
  padding: 0 24px;
}
.header-inner {
  max-width: var(--kr-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--kr-text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-icon {
  background: var(--kr-gradient);
  color: #fff;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  color: var(--kr-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--kr-radius-sm);
  transition: all var(--kr-transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--kr-text-primary);
  background: rgba(87, 65, 217, 0.1);
}
.nav-cta {
  background: var(--kr-purple) !important;
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: var(--kr-radius-sm) !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--kr-purple-dark) !important; }

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

@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--kr-bg-secondary);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--kr-border-light);
  }
  .main-nav.open { display: flex; }
}

/* ─── Hero ─── */
.hero {
  padding: 100px 0 80px;
  background: var(--kr-gradient-dark);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -120px; right: -120px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(87, 65, 217, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero .container { position: relative; z-index: 1; }
.hero .lead { margin-bottom: 32px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--kr-radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--kr-transition);
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--kr-purple);
  color: #fff;
}
.btn-primary:hover { background: var(--kr-purple-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--kr-shadow-purple); }
.btn-secondary {
  background: var(--kr-green);
  color: #fff;
}
.btn-secondary:hover { background: #27AE60; color: #fff; }
.btn-outline {
  background: transparent;
  color: var(--kr-purple-light);
  border: 1px solid var(--kr-border);
}
.btn-outline:hover { background: rgba(87, 65, 217, 0.1); color: var(--kr-text-primary); }

/* ─── Cards ─── */
.card {
  background: var(--kr-bg-card);
  border: 1px solid var(--kr-border-light);
  border-radius: var(--kr-radius);
  padding: 32px;
  transition: all var(--kr-transition);
}
.card:hover {
  border-color: var(--kr-border);
  transform: translateY(-2px);
  box-shadow: var(--kr-shadow-purple);
}
.card h3 { color: var(--kr-text-primary); }
.card p { color: var(--kr-text-secondary); }

.card-icon {
  width: 48px; height: 48px;
  background: var(--kr-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

/* ─── Stats ─── */
.stats-row { display: flex; justify-content: center; gap: 48px; flex-wrap: wrap; padding: 48px 0; }
.stat { text-align: center; }
.stat-value { font-size: 2.5rem; font-weight: 800; color: var(--kr-text-primary); }
.stat-label { font-size: 0.9rem; color: var(--kr-text-muted); margin-top: 4px; }

/* ─── Split ─── */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 768px) { .split { grid-template-columns: 1fr; } }

/* ─── Feature List ─── */
.feature-list { list-style: none; }
.feature-list li {
  padding: 10px 0;
  padding-left: 28px;
  color: var(--kr-text-secondary);
  position: relative;
  border-bottom: 1px solid var(--kr-border-light);
}
.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--kr-green);
  font-weight: 700;
}

/* ─── FAQ ─── */
.faq-item {
  border: 1px solid var(--kr-border-light);
  border-radius: var(--kr-radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
  background: var(--kr-bg-card);
}
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  background: none;
  border: none;
  color: var(--kr-text-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}
.faq-question::after { content: '+'; font-size: 1.3rem; color: var(--kr-purple-light); transition: transform var(--kr-transition); }
.faq-item.open .faq-question::after { content: '\2212'; }
.faq-answer { display: none; padding: 0 24px 18px; }
.faq-item.open .faq-answer { display: block; }
.faq-answer p { color: var(--kr-text-secondary); margin: 0; }

/* ─── CTA Banner ─── */
.cta-banner {
  background: var(--kr-gradient);
  border-radius: var(--kr-radius);
  padding: 56px 48px;
  text-align: center;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255, 255, 255, 0.85); max-width: 600px; margin: 0 auto 24px; }
.cta-banner .btn { background: #fff; color: var(--kr-purple); }
.cta-banner .btn:hover { background: #f0f0f0; }

/* ─── Pricing Table ─── */
.price-table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.price-table th {
  background: var(--kr-bg-card);
  color: var(--kr-text-primary);
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--kr-border);
}
.price-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--kr-border-light);
  color: var(--kr-text-secondary);
}
.price-table tr:hover td { background: rgba(87, 65, 217, 0.05); }

/* ─── Breadcrumb ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--kr-text-muted);
  padding: 16px 0;
}
.breadcrumb a { color: var(--kr-text-muted); }
.breadcrumb a:hover { color: var(--kr-purple-light); }
.breadcrumb span { color: var(--kr-text-muted); }

/* ─── Crypto Price Ticker ─── */
.ticker-row {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 0;
  scrollbar-width: none;
}
.ticker-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--kr-bg-card);
  border: 1px solid var(--kr-border-light);
  border-radius: var(--kr-radius-sm);
  padding: 12px 20px;
  min-width: 200px;
  flex-shrink: 0;
}
.ticker-name { font-weight: 600; color: var(--kr-text-primary); }
.ticker-price { color: var(--kr-text-secondary); font-size: 0.95rem; }
.ticker-change { font-size: 0.85rem; font-weight: 600; }
.ticker-up { color: var(--kr-green); }
.ticker-down { color: var(--kr-red); }

/* ─── Footer ─── */
.site-footer {
  background: var(--kr-bg-secondary);
  border-top: 1px solid var(--kr-border-light);
  padding: 64px 0 32px;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 32px;
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer-brand p { color: var(--kr-text-muted); margin-top: 12px; font-size: 0.85rem; max-width: 280px; }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col h4 { color: var(--kr-text-primary); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.footer-col a { color: var(--kr-text-muted); font-size: 0.85rem; }
.footer-col a:hover { color: var(--kr-purple-light); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 32px;
  margin-top: 48px;
  border-top: 1px solid var(--kr-border-light);
  color: var(--kr-text-muted);
  font-size: 0.8rem;
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--kr-text-muted); }
.footer-links a:hover { color: var(--kr-purple-light); }

/* ─── Utility ─── */
.text-green { color: var(--kr-green); }
.text-purple { color: var(--kr-purple-light); }
.text-center { text-align: center; }
.mt-24 { margin-top: 24px; }
.mb-24 { margin-bottom: 24px; }
.tag {
  display: inline-block;
  background: rgba(87, 65, 217, 0.15);
  color: var(--kr-purple-light);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}