:root {
  --blue: #1a56db;
  --blue-light: #e8f0fe;
  --blue-dark: #0d3a8e;
  --text: #0d0d0d;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;
  --bg: #ffffff;
  --bg-soft: #f8f8f6;
  --bg-card: #ffffff;
  --border: rgba(0,0,0,0.08);
  --border-md: rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  font-size: 16px; line-height: 1.6;
  color: var(--text); background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
body.lang-ko { font-family: 'Noto Sans KR', 'DM Sans', sans-serif; }
body.lang-ja { font-family: 'Noto Sans JP', 'DM Sans', sans-serif; }
body.lang-zh { font-family: 'Noto Sans SC', 'DM Sans', sans-serif; }
h1, h2, h3, h4, .nav-logo { font-family: 'Syne', sans-serif; }
body.lang-ko h1, body.lang-ko h2, body.lang-ko h3, body.lang-ko h4,
body.lang-ja h1, body.lang-ja h2, body.lang-ja h3, body.lang-ja h4,
body.lang-zh h1, body.lang-zh h2, body.lang-zh h3, body.lang-zh h4 {
  font-family: inherit; letter-spacing: -0.3px;
}

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 64px;
  background: rgba(255,255,255,0.93);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-family: 'Syne', sans-serif;
  font-size: 20px; font-weight: 700; letter-spacing: -0.5px;
  color: var(--text); text-decoration: none; flex-shrink: 0;
  display: inline-flex; align-items: center; gap: 0;
}
.nav-logo .logo-accent { color: var(--blue); }
.logo-r-icon { height: 26px; width: auto; display: block; margin-right: 3px; }
.nav-links { display: flex; gap: 1.6rem; list-style: none; }
.nav-links a {
  font-size: 13px; color: var(--text-muted);
  text-decoration: none; transition: color 0.2s; white-space: nowrap;
}
.nav-links a:hover { color: var(--text); }
.nav-right { display: flex; align-items: center; gap: 1rem; flex-shrink: 0; }

/* LANG SELECTOR */
.lang-select-wrap { position: relative; }
.lang-select-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  font-family: inherit; font-size: 13px; font-weight: 500;
  color: var(--text); background: var(--bg-soft);
  border: 1px solid var(--border-md); border-radius: var(--radius-sm);
  cursor: pointer; white-space: nowrap;
}
.lang-select-btn:hover { border-color: var(--blue); }
.lang-flag { font-size: 16px; line-height: 1; }
.lang-arrow { font-size: 10px; color: var(--text-muted); margin-left: 2px; }
.lang-dropdown {
  display: none; position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--bg); border: 1px solid var(--border-md);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  min-width: 160px; z-index: 200; overflow: hidden;
}
.lang-dropdown.open { display: block; }
.lang-option {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; cursor: pointer;
  font-size: 13px; transition: background 0.15s;
  border: none; background: transparent; width: 100%;
  text-align: left; font-family: inherit; color: var(--text);
}
.lang-option:hover { background: var(--bg-soft); }
.lang-option.active { background: var(--blue-light); color: var(--blue); font-weight: 500; }
.lang-option-name { flex: 1; }
.lang-option-native { font-size: 11px; color: var(--text-muted); }
.lang-option.active .lang-option-native { color: var(--blue); opacity: 0.7; }
.nav-cta {
  padding: 8px 18px; font-family: inherit;
  font-size: 13px; font-weight: 500; color: #fff;
  background: var(--blue); border: none;
  border-radius: var(--radius-sm); cursor: pointer;
  text-decoration: none; transition: background 0.2s; white-space: nowrap;
}
.nav-cta:hover { background: var(--blue-dark); }

/* HERO SLIDER */
.hero {
  min-height: 100vh; position: relative; overflow: hidden; padding: 0;
}
.hero-track {
  display: flex; height: 100vh;
  transition: transform 0.7s cubic-bezier(0.65, 0, 0.35, 1);
}
.hero-slide {
  min-width: 100%; height: 100%; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; padding: 8rem 2rem 5rem;
  position: relative; overflow: hidden;
}
.hero-slide-main::before {
  content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 800px; height: 800px; border-radius: 50%;
  background: radial-gradient(ellipse, rgba(26,86,219,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-slide[style*="--slide-bg"]::before {
  content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 900px; border-radius: 50%;
  background: radial-gradient(ellipse, var(--slide-bg) 0%, transparent 70%);
  opacity: 0.6; pointer-events: none;
}
.hero-slide-icon { font-size: 80px; line-height: 1; margin-bottom: 1.6rem; animation: fadeUp 0.6s ease both; }
.hero-slide h2 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(32px, 5vw, 52px); font-weight: 700;
  line-height: 1.15; letter-spacing: -1.5px; margin-bottom: 1.2rem;
  animation: fadeUp 0.6s 0.1s ease both;
}
.hero-dots {
  position: absolute; bottom: 32px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px; z-index: 5;
}
.hero-dot {
  width: 8px; height: 8px; border-radius: 4px; background: rgba(0,0,0,0.15);
  border: none; cursor: pointer; padding: 0; transition: width 0.25s, background 0.25s;
}
.hero-dot:hover { background: rgba(0,0,0,0.3); }
.hero-dot.active { width: 24px; background: var(--blue); }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 500; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--blue);
  background: var(--blue-light); padding: 5px 14px; border-radius: 20px;
  margin-bottom: 2rem; animation: fadeUp 0.6s ease both;
}
.hero h1 {
  font-family: 'Syne', sans-serif;
  font-size: clamp(40px, 6.5vw, 76px); font-weight: 700;
  line-height: 1.1; letter-spacing: -2px; margin-bottom: 1.5rem;
  animation: fadeUp 0.6s 0.1s ease both;
}
body.lang-ko .hero h1, body.lang-ja .hero h1, body.lang-zh .hero h1 {
  font-family: inherit; letter-spacing: -1px; line-height: 1.2;
}
.hero h1 em { font-style: normal; color: var(--blue); }
.hero-sub {
  font-size: 17px; font-weight: 300; color: var(--text-muted); line-height: 1.75;
  max-width: 520px; margin: 0 auto 2.5rem;
  animation: fadeUp 0.6s 0.2s ease both;
}
.hero-btns {
  display: flex; gap: 12px; justify-content: center; flex-wrap: wrap;
  animation: fadeUp 0.6s 0.3s ease both;
}
.btn-primary {
  padding: 13px 30px; font-family: inherit; font-size: 15px; font-weight: 500;
  color: #fff; background: var(--blue); border: none;
  border-radius: var(--radius-sm); cursor: pointer; text-decoration: none;
  transition: background 0.2s, transform 0.15s;
}
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-secondary {
  padding: 13px 30px; font-family: inherit; font-size: 15px; font-weight: 400;
  color: var(--text); background: transparent;
  border: 1px solid var(--border-md); border-radius: var(--radius-sm);
  cursor: pointer; text-decoration: none;
}
.btn-secondary:hover { background: var(--bg-soft); }

/* STATS */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.stat { padding: 2.5rem 2rem; text-align: center; border-right: 1px solid var(--border); }
.stat:last-child { border-right: none; }
.stat-num {
  font-family: 'Syne', sans-serif; font-size: 30px; font-weight: 700;
  color: var(--blue); margin-bottom: 6px;
}
.stat-label { font-size: 13px; color: var(--text-muted); }

/* SECTIONS */
section { padding: 6rem 2.5rem; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-tag {
  font-size: 11px; font-weight: 500; letter-spacing: 2px;
  text-transform: uppercase; color: var(--blue); margin-bottom: 0.8rem;
}
.section-title {
  font-size: clamp(26px, 3.5vw, 40px); font-weight: 700;
  letter-spacing: -0.8px; line-height: 1.18; margin-bottom: 1rem;
}
.section-desc { font-size: 15px; color: var(--text-muted); line-height: 1.8; max-width: 520px; }

/* PLATFORMS */
.platforms-section { background: var(--bg-soft); }
.platforms-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 3rem; flex-wrap: wrap; gap: 1.5rem; }
.platforms-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.platform-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.8rem;
  transition: border-color 0.2s, transform 0.2s;
  text-decoration: none; color: inherit; display: block;
}
.platform-card:hover { border-color: var(--blue); transform: translateY(-3px); }
.platform-icon {
  width: 46px; height: 46px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; margin-bottom: 1rem;
}
.platform-status {
  display: inline-block; font-size: 11px; font-weight: 500;
  padding: 3px 10px; border-radius: 20px; margin-bottom: 0.7rem;
}
.status-dev { background: #fef3c7; color: #92400e; }
.status-live { background: #d1fae5; color: #065f46; }
.platform-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 7px; }
.platform-card p { font-size: 13px; color: var(--text-muted); line-height: 1.7; margin-bottom: 1rem; }
.platform-arrow { font-size: 13px; color: var(--blue); font-weight: 500; }

/* PLATFORM DETAIL */
.platform-detail-hero { max-width: 640px; margin: 0 auto; text-align: center; }
.platform-detail-icon {
  width: 60px; height: 60px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; margin: 0 auto 1.2rem;
}
.platform-detail-hero .section-title { margin: 0.8rem 0 1.2rem; }
.platform-detail-hero .section-desc { margin: 0 auto 2rem; max-width: 560px; }
.platform-detail-visual {
  max-width: 900px; margin: 0 auto; border-radius: var(--radius);
  overflow: hidden; box-shadow: 0 20px 50px -14px rgba(13,13,13,0.2);
}
.platform-detail-visual img { width: 100%; height: auto; display: block; }

/* ABOUT */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 5rem; align-items: start; }
.values-list { display: flex; flex-direction: column; gap: 12px; }
.value-item {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 1.1rem 1.3rem; background: var(--bg-soft);
  border-radius: var(--radius-sm); border: 1px solid var(--border);
}
.value-icon {
  width: 34px; height: 34px; flex-shrink: 0; border-radius: 8px;
  background: var(--blue-light); display: flex; align-items: center;
  justify-content: center; font-size: 15px;
}
.value-item h4 { font-size: 14px; font-weight: 600; margin-bottom: 3px; }
.value-item p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* VISION */
.vision-section { background: var(--bg-soft); }
.vision-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 3rem; }
.vision-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.8rem; }
.vision-line { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.vision-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--blue); flex-shrink: 0; }
.vision-connector { flex: 1; height: 1px; background: var(--border-md); }
.vision-year { font-family: 'Syne', sans-serif; font-size: 13px; font-weight: 700; color: var(--blue); letter-spacing: 1px; margin-bottom: 8px; }
.vision-card h4 { font-size: 17px; font-weight: 600; margin-bottom: 7px; }
.vision-card p { font-size: 13px; color: var(--text-muted); line-height: 1.7; }

/* CONTACT */
.contact-section { text-align: center; background: var(--text); color: #fff; }
.contact-section .section-tag { color: rgba(255,255,255,0.45); }
.contact-section .section-title { color: #fff; max-width: 560px; margin: 0 auto 1rem; }
.contact-section > .section-inner > p { font-size: 16px; color: rgba(255,255,255,0.55); margin-bottom: 2.5rem; }
.contact-email-btn {
  display: inline-block; padding: 14px 36px; font-family: inherit;
  font-size: 15px; font-weight: 500; color: var(--text); background: #fff;
  border-radius: var(--radius-sm); text-decoration: none; transition: opacity 0.2s;
}
.contact-email-btn:hover { opacity: 0.88; }

/* CLOSING VISUAL */
.closing-visual { padding-bottom: 3rem; }
.closing-visual-wrap {
  position: relative; border-radius: var(--radius); overflow: hidden;
  box-shadow: 0 20px 50px -14px rgba(13,13,13,0.2);
}
.closing-visual-track {
  display: flex;
  transition: transform 0.7s cubic-bezier(0.65, 0, 0.35, 1);
}
.closing-visual-slide { position: relative; min-width: 100%; }
.closing-visual-slide > a { display: block; cursor: pointer; }
.closing-visual-img { width: 100%; height: auto; display: block; transition: transform 0.4s ease; }
.closing-visual-slide > a:hover .closing-visual-img { transform: scale(1.03); }
.closing-visual-caption {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  font-family: 'Syne', sans-serif; font-weight: 700;
  font-size: clamp(22px, 4vw, 46px); letter-spacing: -1px;
  color: #fff; text-align: center; pointer-events: none;
  text-shadow: 0 2px 16px rgba(0,0,0,0.35);
}
.closing-visual-dots {
  display: flex; justify-content: center; gap: 8px; margin-top: 1.4rem;
}
.closing-visual-dot {
  width: 8px; height: 8px; border-radius: 4px; background: rgba(0,0,0,0.15);
  border: none; cursor: pointer; padding: 0; transition: width 0.25s, background 0.25s;
}
.closing-visual-dot:hover { background: rgba(0,0,0,0.3); }
.closing-visual-dot.active { width: 24px; background: var(--blue); }

/* FOOTER */
footer {
  padding: 1.8rem 2.5rem; display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid var(--border); background: var(--bg); flex-wrap: wrap; gap: 1rem;
}
.footer-logo { font-family: 'Syne', sans-serif; font-size: 16px; font-weight: 700; display: inline-flex; align-items: center; gap: 8px; }
.footer-logo .logo-accent { color: var(--blue); }
.footer-logo .logo-mark { height: 24px; width: auto; border-radius: 6px; }
.footer-copy { font-size: 12px; color: var(--text-faint); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 12px; color: var(--text-faint); text-decoration: none; }
.footer-links a:hover { color: var(--text-muted); }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (max-width: 900px) { .nav-links { display: none; } }
@media (max-width: 768px) {
  nav { padding: 0 1.2rem; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat { border-right: none; border-bottom: 1px solid var(--border); }
  section { padding: 4rem 1.2rem; }
  .platforms-grid, .about-grid, .vision-grid { grid-template-columns: 1fr; }
  .about-grid { gap: 2.5rem; }
  footer { flex-direction: column; text-align: center; }
}