/* ═══════════════════════════════════════════
   범온 AI 슈퍼차트 — Landing Page CSS
   ═══════════════════════════════════════════ */

/* === Variables === */
:root {
  --wine: #921230;
  --wine-hover: #A31540;
  --wine-dark: #6A1E33;
  --gold: #D8B66A;
  --gold-light: #E8D4A0;
  --gold-dark: #B8942E;
  --bg: #FAFAFA;
  --bg-dark: #0F0F12;
  --surface: #FFFFFF;
  --surface-dark: #1A1A22;
  --text: #0F172A;
  --text-secondary: #475569;
  --text-muted: #64748B;
  --border: #E2E8F0;
  --border-dark: rgba(255,255,255,0.08);
  --font: "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* === Container === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* === Navigation === */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0;
  background: rgba(250,250,250,0.8);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}
.nav.scrolled {
  padding: 10px 0;
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { display: flex; align-items: center; gap: 10px; }
.nav-logo { border-radius: 8px; }
.nav-name { font-size: 17px; font-weight: 800; color: var(--wine); letter-spacing: -0.02em; }
.nav-links { display: flex; gap: 32px; }
.nav-link {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--wine); }
.nav-link::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 2px; background: var(--wine); border-radius: 1px;
  transform: scaleX(0); transition: transform var(--transition);
}
.nav-link:hover::after { transform: scaleX(1); }
.nav-actions { display: flex; gap: 10px; align-items: center; }
.btn-nav-secondary {
  padding: 8px 16px; font-size: 14px; font-weight: 600;
  color: var(--text-secondary); border-radius: var(--radius-sm);
  transition: var(--transition);
}
.btn-nav-secondary:hover { color: var(--wine); background: rgba(146,18,48,0.05); }
.btn-nav-primary {
  padding: 8px 20px; font-size: 14px; font-weight: 600;
  color: #fff; background: var(--wine); border-radius: var(--radius-sm);
  transition: var(--transition);
}
.btn-nav-primary:hover { background: var(--wine-hover); transform: translateY(-1px); }
.nav-toggle { display: none; width: 32px; height: 32px; flex-direction: column; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text); border-radius: 1px; transition: var(--transition); }

/* === Hero === */
.hero {
  position: relative; min-height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 120px 0 60px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(146,18,48,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(146,18,48,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.hero-glow {
  position: absolute; border-radius: 50%; filter: blur(100px); opacity: 0.4;
}
.hero-glow-1 { width: 600px; height: 600px; top: -200px; right: -100px; background: rgba(146,18,48,0.15); }
.hero-glow-2 { width: 400px; height: 400px; bottom: -100px; left: -100px; background: rgba(216,182,106,0.12); }

.hero-content { text-align: center; position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(146,18,48,0.06); border: 1px solid rgba(146,18,48,0.12);
  font-size: 13px; font-weight: 600; color: var(--wine);
  margin-bottom: 24px;
}
.badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: #16A34A;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

.hero-title {
  font-size: clamp(36px, 6vw, 64px); font-weight: 800;
  line-height: 1.15; letter-spacing: -0.03em;
  margin-bottom: 20px; color: var(--text);
}
.text-gradient {
  background: linear-gradient(135deg, var(--wine), var(--gold-dark));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(16px, 2vw, 19px); color: var(--text-secondary);
  line-height: 1.7; margin-bottom: 36px; max-width: 600px; margin-inline: auto;
}
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }

/* === Buttons === */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; font-size: 15px; font-weight: 700;
  color: #fff; background: linear-gradient(135deg, var(--wine), var(--wine-hover));
  border-radius: var(--radius-md); transition: var(--transition);
  box-shadow: 0 4px 16px rgba(146,18,48,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(146,18,48,0.4); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; font-size: 15px; font-weight: 600;
  color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  transition: var(--transition);
}
.btn-secondary:hover { border-color: var(--wine); color: var(--wine); transform: translateY(-2px); }
.btn-lg { padding: 16px 32px; font-size: 16px; }
.btn-xl { padding: 18px 40px; font-size: 17px; border-radius: var(--radius-lg); }

/* === Hero Stats === */
.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 32px;
  flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-number { font-size: 32px; font-weight: 800; color: var(--wine); letter-spacing: -0.02em; }
.stat-plus { font-size: 24px; font-weight: 700; color: var(--gold); }
.stat-label { display: block; font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

/* === Hero Visual (Browser Frame) === */
.hero-visual {
  width: 100%; max-width: 900px; margin: 60px auto 0;
  position: relative; z-index: 1;
}
.browser-frame {
  background: var(--surface); border-radius: var(--radius-lg);
  border: 1px solid var(--border); overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.browser-dots {
  display: flex; gap: 6px; padding: 12px 16px;
  border-bottom: 1px solid var(--border); background: #F8FAFC;
}
.browser-dots span { width: 10px; height: 10px; border-radius: 50%; background: #E2E8F0; }
.browser-dots span:first-child { background: #FCA5A5; }
.browser-dots span:nth-child(2) { background: #FDE68A; }
.browser-dots span:nth-child(3) { background: #86EFAC; }
.browser-url {
  padding: 6px 16px; font-size: 12px; color: var(--text-muted);
  border-bottom: 1px solid var(--border); background: #F8FAFC;
}
.browser-content { padding: 0; background: #0F0F12; }
.mock-chart { position: relative; width: 100%; aspect-ratio: 2/1; }
.mock-chart canvas { width: 100%; height: 100%; display: block; }

/* === Sections === */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-dark); color: #E2E8F0; }
.section-dark .section-title { color: #F8FAFC; }
.section-dark .section-desc { color: #94A3B8; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block; padding: 4px 14px; border-radius: 100px;
  font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  background: rgba(146,18,48,0.08); color: var(--wine); margin-bottom: 16px;
}
.section-dark .section-tag { background: rgba(216,182,106,0.12); color: var(--gold); }
.section-title {
  font-size: clamp(28px, 4vw, 42px); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 14px;
}
.section-desc { font-size: 17px; color: var(--text-secondary); max-width: 560px; margin-inline: auto; }

/* === Feature Cards === */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.feature-card {
  padding: 32px; border-radius: var(--radius-lg);
  background: var(--surface); border: 1px solid var(--border);
  transition: var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--wine), var(--gold));
  opacity: 0; transition: opacity var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-card:hover::before { opacity: 1; }
.feature-card-lg { grid-column: span 1; grid-row: span 2; }
.feature-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  background: rgba(146,18,48,0.06); color: var(--wine); margin-bottom: 20px;
}
.feature-icon-gold { background: rgba(216,182,106,0.1); color: var(--gold-dark); }
.feature-icon-blue { background: rgba(59,130,246,0.08); color: #2563EB; }
.feature-icon-green { background: rgba(22,163,74,0.08); color: #16A34A; }
.feature-icon-purple { background: rgba(139,92,246,0.08); color: #7C3AED; }
.feature-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.01em; }
.feature-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.feature-list {
  list-style: none; margin-top: 16px; display: flex; flex-direction: column; gap: 8px;
}
.feature-list li {
  font-size: 13px; color: var(--text-secondary); padding-left: 20px; position: relative;
}
.feature-list li::before {
  content: '✓'; position: absolute; left: 0; color: var(--wine); font-weight: 700;
}

/* === Indicators === */
.indicators-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px;
}
.ind-category {
  padding: 24px; border-radius: var(--radius-lg);
  background: var(--surface-dark); border: 1px solid var(--border-dark);
  transition: var(--transition);
}
.ind-category:hover { border-color: rgba(216,182,106,0.3); transform: translateY(-2px); }
.ind-cat-icon { font-size: 24px; margin-bottom: 10px; }
.ind-cat-title { font-size: 15px; font-weight: 700; color: #F1F5F9; margin-bottom: 12px; }
.ind-cat-items { display: flex; flex-wrap: wrap; gap: 6px; }
.ind-item {
  padding: 4px 10px; border-radius: 100px; font-size: 12px; font-weight: 500;
  background: rgba(255,255,255,0.06); color: #CBD5E1; border: 1px solid rgba(255,255,255,0.08);
}
.ind-item.ind-pro {
  background: rgba(216,182,106,0.1); color: var(--gold); border-color: rgba(216,182,106,0.2);
}

/* === Technology (3D Flip Cards) === */
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.tech-card { perspective: 1000px; height: 220px; }
.tech-card-inner {
  position: relative; width: 100%; height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.tech-card:hover .tech-card-inner { transform: rotateY(180deg); }
.tech-front, .tech-back {
  position: absolute; inset: 0; border-radius: var(--radius-lg);
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 24px; text-align: center;
}
.tech-front {
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.tech-back {
  background: linear-gradient(135deg, var(--wine), var(--wine-dark));
  color: #fff; transform: rotateY(180deg);
}
.tech-back p { font-size: 13px; line-height: 1.7; }
.tech-icon { font-size: 36px; margin-bottom: 12px; }
.tech-front h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.tech-front p { font-size: 13px; color: var(--text-muted); }

/* === FAQ === */
.faq-list { max-width: 700px; margin: 0 auto; display: flex; flex-direction: column; gap: 8px; }
.faq-item {
  border-radius: var(--radius-md); overflow: hidden;
  background: var(--surface-dark); border: 1px solid var(--border-dark);
  transition: var(--transition);
}
.faq-item[open] { border-color: rgba(216,182,106,0.3); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; cursor: pointer; font-size: 15px; font-weight: 600;
  color: #F1F5F9; list-style: none; transition: var(--transition);
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question:hover { color: var(--gold); }
.faq-chevron { transition: transform var(--transition); color: var(--text-muted); flex-shrink: 0; }
.faq-item[open] .faq-chevron { transform: rotate(180deg); }
.faq-answer {
  padding: 0 24px 18px; font-size: 14px; color: #94A3B8; line-height: 1.7;
}

/* === CTA === */
.section-cta {
  background: linear-gradient(135deg, var(--wine) 0%, var(--wine-dark) 100%);
  text-align: center; padding: 80px 0;
}
.cta-title { font-size: clamp(28px, 4vw, 38px); font-weight: 800; color: #fff; margin-bottom: 14px; }
.cta-desc { font-size: 17px; color: rgba(255,255,255,0.75); margin-bottom: 32px; }
.section-cta .btn-primary {
  background: #fff; color: var(--wine); box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.section-cta .btn-primary:hover { box-shadow: 0 8px 30px rgba(0,0,0,0.3); }

/* === Footer === */
.footer { padding: 48px 0 24px; border-top: 1px solid var(--border); }
.footer-grid { display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 24px; margin-bottom: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--wine); }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--wine); }
.footer-info p { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.footer-disclaimer { font-size: 11px; color: #94A3B8; max-width: 400px; line-height: 1.5; }
.footer-bottom { padding-top: 24px; border-top: 1px solid var(--border); }
.footer-bottom p { font-size: 12px; color: var(--text-muted); text-align: center; }

/* === Animations === */
[data-animate] { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-animate].visible { opacity: 1; transform: translateY(0); }

/* === Responsive === */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card-lg { grid-column: span 1; grid-row: span 1; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--surface); padding: 20px 24px; gap: 16px;
    box-shadow: var(--shadow-md); z-index: 100;
  }
  .nav-actions.open {
    display: flex; gap: 10px; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--surface); padding: 0 24px 20px;
    margin-top: 180px; box-shadow: 0 4px 12px rgba(0,0,0,0.08); z-index: 100;
  }
  .nav-toggle { display: flex; }
  .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.active span:nth-child(2) { opacity: 0; }
  .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .hero { padding: 100px 0 40px; min-height: auto; }
  .hero-title { font-size: 32px; }
  .hero-desc br { display: none; }
  .hero-stats { gap: 20px; }
  .stat-number { font-size: 24px; }
  .stat-divider { height: 30px; }
  .hero-visual { margin-top: 40px; }

  .section { padding: 60px 0; }
  .features-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr 1fr; }
  .tech-card { height: 180px; }
  .indicators-grid { grid-template-columns: 1fr 1fr; }

  .footer-grid { flex-direction: column; align-items: center; text-align: center; }
  .footer-links { justify-content: center; }
  .footer-disclaimer { margin-inline: auto; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-title { font-size: 28px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .btn-lg { width: 100%; justify-content: center; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .stat-divider { width: 40px; height: 1px; }
  .tech-grid { grid-template-columns: 1fr; }
  .indicators-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 24px; }
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  [data-animate] { opacity: 1; transform: none; }
  .tech-card:hover .tech-card-inner { transform: none; }
}