:root {
  --navy: #061E4A;
  --accent: #3B82F6;
  --emerald: #10B981;
  --orange: #F97316;
  --red: #EF4444;
  --bg: #FFFFFF;
  --bg-subtle: #F8FAFC;
  --bg-panel: #F1F5F9;
  --text-primary: #1E293B;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border: #F1F5F9;
  --border-mid: #E2E8F0;
  
  --indigo: #6366f1;
  --purple: #8b5cf6;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Pretendard', sans-serif;
  color: var(--text-primary);
  background-color: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}
.font-outfit { font-family: 'Outfit', sans-serif; }
a { text-decoration: none; }

/* Top Navigation */
.home-link {
  position: fixed; top: 20px; left: 24px; z-index: 1000;
  display: flex; align-items: center; gap: 8px;
  background: rgba(6, 30, 74, 0.85);
  backdrop-filter: blur(12px);
  color: #fff; padding: 10px 16px; border-radius: 2px;
  font-weight: 700; font-size: 14px; letter-spacing: 1px;
  transition: all 0.3s;
}
.home-link:hover { background: var(--accent); box-shadow: 0 4px 12px rgba(59,130,246,0.3); }

/* Common */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.text-center { text-align: center; }
.text-red { color: var(--red); }
.text-orange { color: var(--orange); }
.text-emerald { color: var(--emerald); }
.text-accent { color: var(--accent); }
.text-indigo { color: var(--indigo); }
.text-purple { color: var(--purple); }
.text-white { color: #fff; }

.section-header { margin-bottom: 48px; }
.section-label { font-size: 11px; color: var(--accent); font-weight: 700; letter-spacing: 0.2em; display: block; margin-bottom: 12px; }
.section-title { font-size: 28px; font-weight: 700; color: var(--navy); margin-bottom: 16px; }
.section-desc { font-size: 15px; color: var(--text-secondary); max-width: 640px; margin: 0 auto; }

/* Reveal Animation */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* SECTION 1: HERO */
.hero-section {
  position: relative; min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  background-color: #FAFBFF; overflow: hidden;
}
.aurora-layer, .hero-canvas-container, .floating-keywords, .grid-lines {
  position: absolute; inset: 0; pointer-events: none;
}
.aurora-layer { z-index: 0; }
.hero-canvas-container { z-index: 1; }
.floating-keywords { z-index: 1; }
.grid-lines { z-index: 1; display: flex; }
.grid-lines .line { position: absolute; top: 0; bottom: 0; width: 1px; background: rgba(6,30,74,0.04); }

.aurora-blob { position: absolute; border-radius: 50%; animation: aurora-drift 20s ease-in-out infinite; filter: blur(80px); }
.blob-1 { width: 500px; height: 500px; background: rgba(59,130,246,0.15); top: -10%; left: 10%; }
.blob-2 { width: 600px; height: 600px; background: rgba(6,30,74,0.10); bottom: -10%; right: 10%; animation-delay: -5s; }
.blob-3 { width: 450px; height: 450px; background: rgba(16,185,129,0.08); top: 30%; left: 40%; animation-delay: -10s; }

@keyframes aurora-drift {
  0%   { transform: translate(0, 0) scale(1); }
  25%  { transform: translate(60px, -40px) scale(1.15); }
  50%  { transform: translate(-30px, 30px) scale(0.95); }
  75%  { transform: translate(40px, 50px) scale(1.1); }
  100% { transform: translate(0, 0) scale(1); }
}

.fw {
  position: absolute; left: var(--x); top: var(--y);
  font: 700 18px 'Outfit'; color: rgba(6,30,74,0.18);
  text-transform: uppercase; letter-spacing: 0.15em;
  animation: fw-float 20s ease-in-out infinite; animation-delay: var(--delay); opacity: 0;
}
@keyframes fw-float {
  0%   { opacity: 0; transform: translate(0,0) scale(0.8); }
  10%  { opacity: 1; }
  45%  { opacity: 1; transform: translate(20px,-30px) scale(1.1); }
  90%  { opacity: 1; }
  100% { opacity: 0; transform: translate(0,0) scale(0.8); }
}

.hero-content { position: relative; z-index: 2; text-align: center; max-width: 900px; padding: 0 24px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--navy); color: #fff; padding: 6px 14px; border-radius: 2px;
  font-size: 11px; font-weight: 700; letter-spacing: 1px; margin-bottom: 24px;
}
.pulse-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--emerald); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.gradient-title {
  font-size: clamp(36px, 5vw, 64px); line-height: 1.1; letter-spacing: -0.02em; margin-bottom: 20px;
  background: linear-gradient(90deg, #061E4A 0%, #3B82F6 33%, #1D4ED8 66%, #061E4A 100%);
  background-size: 300% 100%;
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  animation: gradient-x 3s ease-in-out infinite;
}
@keyframes gradient-x { 0% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }

.hero-desc { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto 40px; }

.cta-button {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--navy); color: #fff; padding: 14px 28px; border-radius: 2px;
  font-size: 14px; font-weight: 700; transition: all 0.3s; margin-bottom: 64px;
}
.cta-button:hover { background: var(--accent); transform: translateY(-2px); box-shadow: 0 10px 20px rgba(59,130,246,0.3); }

.hero-stats { display: flex; gap: 48px; justify-content: center; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { font-size: 36px; font-weight: 700; color: var(--navy); line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: 11px; color: var(--text-muted); font-weight: 700; letter-spacing: 1px; }

/* SECTION 2: PLATFORM CONTENTS */
.feature-section { padding: 100px 0; background: var(--bg); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.feature-card {
  border: 1px solid var(--border); border-radius: 2px; padding: 32px 24px;
  border-bottom: 3px solid var(--border-mid); transition: all 0.3s; background: #fff;
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: 0 12px 24px rgba(0,0,0,0.05); border-bottom-color: var(--accent); }
.feature-icon { width: 40px; height: 40px; margin-bottom: 20px; }
.feature-card h3 { font-size: 17px; font-weight: 700; color: var(--navy); margin-bottom: 12px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); }

/* SECTION 3 & 6: NAVY BLOCK */
.navy-section { padding: 100px 0; background: var(--navy); position: relative; overflow: hidden; }
.deco-circle { position: absolute; border-radius: 50%; background: rgba(59,130,246,0.06); pointer-events: none; }
.circle-1 { width: 400px; height: 400px; top: -100px; right: -100px; animation: float 18s infinite ease-in-out; }
.circle-2 { width: 300px; height: 300px; bottom: -50px; left: -100px; animation: float 14s infinite ease-in-out reverse; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-40px); } }

.navy-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; position: relative; z-index: 2; }
.navy-card {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); border-radius: 2px;
  padding: 32px 24px; transition: all 0.3s;
}
.navy-card:hover { background: rgba(255,255,255,0.08); border-color: rgba(59,130,246,0.3); transform: translateY(-4px); }
.navy-card-num { font-size: 11px; color: var(--accent); font-weight: 700; margin-bottom: 16px; letter-spacing: 1px; }
.navy-card h3 { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.navy-card p { font-size: 14px; color: rgba(255,255,255,0.7); }

/* SECTION 4: DATA PIPELINE */
.pipeline-section { padding: 100px 0; background: var(--bg); overflow: hidden; }
.pipeline-flow { display: flex; align-items: center; justify-content: space-between; max-width: 1200px; margin: 0 auto; padding: 0 24px; overflow-x: auto; padding-bottom: 24px; }
.pipeline-step {
  flex: 0 0 160px; background: #fff; border: 1px solid var(--border-mid); border-radius: 2px; padding: 20px 16px;
  text-align: center; transition: all 0.4s;
}
.pipeline-step.step-active { background: var(--navy); border-color: var(--accent); transform: translateY(-6px); box-shadow: 0 12px 24px rgba(6,30,74,0.15); }
.step-num { font-size: 11px; font-weight: 700; color: var(--accent); margin-bottom: 8px; letter-spacing: 1px; }
.pipeline-step h4 { font-size: 15px; font-weight: 700; color: var(--navy); margin-bottom: 8px; transition: color 0.4s; }
.pipeline-step p { font-size: 12px; color: var(--text-muted); transition: color 0.4s; }
.pipeline-step.step-active h4 { color: #fff; }
.pipeline-step.step-active p { color: rgba(255,255,255,0.7); }

.pipeline-arrow { color: var(--border-mid); display: flex; align-items: center; justify-content: center; width: 24px; animation: arrow-pulse 2s infinite; }
@keyframes arrow-pulse { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(5px); } }

/* SECTION 5: IMAGE-TEXT ROWS */
.image-text-section { padding: 100px 0; background: var(--bg); }
.img-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; margin-bottom: 80px; }
.img-row:last-child { margin-bottom: 0; }
.img-row-reverse { direction: rtl; }
.img-row-reverse > * { direction: ltr; }

.img-box { border-radius: 2px; overflow: hidden; height: 320px; }
.placeholder-img { transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1); }
.img-box:hover .placeholder-img { transform: scale(1.03); }

.text-box .tag { display: inline-block; font-size: 10px; font-weight: 700; color: var(--accent); border: 1px solid var(--accent); padding: 4px 8px; border-radius: 2px; margin-bottom: 16px; }
.text-box h4 { font-size: 20px; font-weight: 700; color: var(--navy); margin-bottom: 16px; }
.text-box p { font-size: 14px; color: var(--text-secondary); margin-bottom: 16px; }
.text-box ul { list-style: none; }
.text-box li { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; padding-left: 12px; position: relative; }
.text-box li::before { content: ''; position: absolute; left: 0; top: 6px; width: 4px; height: 4px; background: var(--accent); }

/* FOOTER */
.site-footer { max-width: 1200px; margin: 0 auto; border-top: 1px solid var(--border-mid); padding: 32px 24px; display: flex; justify-content: space-between; color: #BFBFBF; font-size: 13px; }
.site-footer a { color: #BFBFBF; transition: color 0.3s; }
.site-footer a:hover { color: var(--accent); }

@media (max-width: 768px) {
  .img-row { grid-template-columns: 1fr; }
  .img-row-reverse { direction: ltr; }
  .pipeline-flow { padding-bottom: 20px; }
}