/* ═══════════════════════════════════════════════════════════
   Kraken.gr.com Design System — Premium Dark 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: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* ─── 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: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

img { max-width: 100%; height: auto; display: block; border-radius: var(--kr-radius-sm); }

/* ─── Typography ─── */
h1, h2, h3, h4 { font-weight: 800; line-height: 1.1; color: var(--kr-text-primary); letter-spacing: -0.02em; }
h1 { font-size: clamp(2.5rem, 6vw, 4rem); margin-bottom: 24px; background: linear-gradient(to right, #fff, var(--kr-text-secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 20px; position: relative; padding-bottom: 12px; }
h2::after { content: ''; position: absolute; bottom: 0; left: 0; width: 60px; height: 4px; background: var(--kr-gradient); border-radius: 2px; }
h3 { font-size: clamp(1.3rem, 3vw, 1.8rem); margin-bottom: 16px; }
h4 { font-size: 1.2rem; margin-bottom: 12px; }
p { margin-bottom: 20px; color: var(--kr-text-secondary); }
.lead { font-size: 1.25rem; color: var(--kr-text-secondary); max-width: 800px; line-height: 1.6; }

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

.section { padding: 100px 0; }
.section-alt { background: var(--kr-bg-secondary); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-header .lead { margin: 16px auto 0; }

/* ─── Grid ─── */
.grid { display: grid; gap: 32px; }
.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(11, 11, 26, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--kr-border-light);
  transition: var(--kr-transition);
}
.header-inner {
  max-width: var(--kr-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  padding: 0 24px;
}
.logo {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--kr-text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  text-transform: lowercase;
}
.logo-icon {
  width: 40px; height: 40px;
  background: var(--kr-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  font-size: 1.2rem;
  font-weight: 900;
  box-shadow: var(--kr-shadow-purple);
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.main-nav a {
  color: var(--kr-text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--kr-radius-sm);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--kr-text-primary);
  background: rgba(87, 65, 217, 0.15);
}
.nav-cta {
  background: var(--kr-purple) !important;
  color: #fff !important;
  padding: 10px 24px !important;
  box-shadow: var(--kr-shadow-purple);
}
.nav-cta:hover { background: var(--kr-purple-dark) !important; transform: translateY(-2px); }

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--kr-text-primary);
  font-size: 1.8rem;
  cursor: pointer;
}

@media (max-width: 992px) {
  .mobile-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 80px; left: 0; right: 0;
    background: var(--kr-bg-secondary);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--kr-border-light);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  }
  .main-nav.open { display: flex; }
}

/* ─── Hero ─── */
.hero {
  padding: 140px 0 100px;
  background: radial-gradient(circle at top right, rgba(87, 65, 217, 0.15), transparent 400px), 
              radial-gradient(circle at bottom left, rgba(52, 152, 219, 0.1), transparent 400px);
  position: relative;
}
.hero-content { max-width: 800px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 40px; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--kr-radius-sm);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--kr-transition);
  border: none;
}
.btn-primary { background: var(--kr-purple); color: #fff; }
.btn-primary:hover { background: var(--kr-purple-dark); transform: translateY(-3px); box-shadow: 0 10px 20px rgba(87, 65, 217, 0.3); }
.btn-outline { background: transparent; color: var(--kr-text-primary); border: 2px solid var(--kr-border); }
.btn-outline:hover { background: rgba(255, 255, 255, 0.05); border-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: 40px;
  transition: all var(--kr-transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-8px);
  border-color: var(--kr-purple-light);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}
.card-icon {
  width: 56px; height: 56px;
  background: var(--kr-gradient);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 24px;
  box-shadow: var(--kr-shadow-purple);
}

/* ─── Stats ─── */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; margin-top: 60px; }
.stat { text-align: left; border-left: 2px solid var(--kr-purple); padding-left: 20px; }
.stat-value { font-size: 2.8rem; font-weight: 900; color: #fff; line-height: 1; }
.stat-label { font-size: 0.95rem; color: var(--kr-text-muted); margin-top: 8px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }

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

/* ─── Breadcrumb ─── */
.breadcrumb-container { background: var(--kr-bg-secondary); border-bottom: 1px solid var(--kr-border-light); }
.breadcrumb { list-style: none; display: flex; align-items: center; gap: 10px; padding: 12px 0; color: var(--kr-text-muted); font-size: 0.9rem; }
.breadcrumb li:not(:last-child)::after { content: '/'; margin-left: 10px; opacity: 0.5; }
.breadcrumb a { color: var(--kr-text-muted); font-weight: 500; }
.breadcrumb a:hover { color: var(--kr-purple-light); }
.breadcrumb .active { color: var(--kr-text-primary); font-weight: 600; }

/* ─── FAQ ─── */
.faq-list { max-width: 900px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--kr-border-light); margin-bottom: 10px; }
.faq-question {
  width: 100%; padding: 24px 0; background: none; border: none;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--kr-text-primary); font-size: 1.2rem; font-weight: 700;
  cursor: pointer; text-align: left;
}
.faq-question span { transition: var(--kr-transition); color: var(--kr-purple-light); font-size: 1.5rem; }
.faq-answer { max-height: 0; overflow: hidden; transition: all 0.4s ease; color: var(--kr-text-secondary); }
.faq-item.active .faq-answer { max-height: 500px; padding-bottom: 24px; }
.faq-item.active .faq-question span { transform: rotate(45deg); }

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

/* ─── Footer ─── */
.site-footer { background: #05050F; padding: 100px 0 40px; border-top: 1px solid var(--kr-border-light); }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px; margin-bottom: 80px; }
.footer-brand .logo { margin-bottom: 24px; }
.footer-brand p { max-width: 320px; font-size: 0.95rem; }
.footer-nav h4 { color: #fff; margin-bottom: 24px; font-size: 1rem; text-transform: uppercase; letter-spacing: 1.5px; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 12px; }
.footer-nav a { color: var(--kr-text-muted); font-size: 0.95rem; }
.footer-nav a:hover { color: #fff; padding-left: 5px; }
.footer-bottom { border-top: 1px solid var(--kr-border-light); padding-top: 40px; display: flex; justify-content: space-between; align-items: center; color: var(--kr-text-muted); font-size: 0.9rem; }

@media (max-width: 992px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 576px) {
  .footer-top { grid-template-columns: 1fr; text-align: center; }
  .footer-brand p { margin: 0 auto; }
  .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }
}

/* ─── Content Styling (for long articles) ─── */
.article-content { max-width: 900px; margin: 0 auto; }
.article-content h2 { margin-top: 60px; }
.article-content h3 { margin-top: 40px; }
.article-content ul, .article-content ol { margin-bottom: 24px; padding-left: 24px; color: var(--kr-text-secondary); }
.article-content li { margin-bottom: 12px; }
.article-content blockquote { border-left: 4px solid var(--kr-purple); padding-left: 24px; font-style: italic; font-size: 1.2rem; color: #fff; margin: 40px 0; }

.ai-chunk {
    font-style: italic;
    color: var(--kr-purple-light);
    opacity: 0.85;
    margin-top: -10px;
    margin-bottom: 25px;
    font-size: 0.95rem;
    border-left: 2px solid var(--kr-purple);
    padding-left: 15px;
    line-height: 1.5;
}

/* Utility Classes */
.mt-24 { margin-top: 24px; }
.mb-24 { margin-bottom: 24px; }
.text-green { color: #00ff88; }
.text-red { color: #ff4d4d; }
.text-purple { color: var(--kr-purple-light); }

@media (max-width: 768px) {
    .ai-chunk {
        font-size: 0.85rem;
    }
}