:root {
  --bg: #ffffff;
  --bg-alt: #ecfbf7;
  --surface: #ffffff;
  --text: #08202b;
  --text-muted: #536876;
  --border: #d4e8e5;

  /* Teal scale — more saturated */
  --teal-50:  #ecfdf7;
  --teal-100: #ccfbef;
  --teal-200: #9af5e0;
  --teal-300: #5eead4;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;
  --teal-800: #115e59;
  --teal-900: #0a3a36;

  --brand: var(--teal-500);
  --brand-strong: var(--teal-700);
  --brand-deep: var(--teal-900);
  --brand-bright: var(--teal-400);
  --brand-soft: var(--teal-100);

  /* Cool accent for pop (kept within cool/ocean family) */
  --accent: #06b6d4;
  --accent-strong: #0891b2;

  --shadow-sm: 0 1px 2px rgba(8, 32, 43, 0.05);
  --shadow-md: 0 10px 24px rgba(13, 148, 136, 0.18);
  --shadow-lg: 0 24px 60px rgba(8, 58, 54, 0.22);
  --radius: 12px;
  --radius-lg: 18px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--brand-strong); }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.lang-toggle {
  display: inline-flex;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
}

.lang-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 6px 12px;
  font: inherit;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.04em;
}

.lang-toggle button.is-active {
  background: #fff;
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

@media (max-width: 720px) {
  .lang-toggle button { padding: 4px 9px; font-size: 11.5px; }
}
@media (max-width: 380px) {
  .lang-toggle { display: none; }
}

/* Hero — saturated teal, a touch lighter */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 132px;
  color: #eafffb;
  background:
    radial-gradient(900px 520px at 85% 0%, rgba(94, 234, 212, 0.45), transparent 65%),
    radial-gradient(700px 460px at 5% 100%, rgba(34, 211, 238, 0.35), transparent 70%),
    linear-gradient(140deg, #0f766e 0%, #0d9488 45%, #14b8a6 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(2px 2px at 18% 28%, rgba(255,255,255,0.35), transparent 60%),
    radial-gradient(2px 2px at 72% 66%, rgba(255,255,255,0.25), transparent 60%),
    radial-gradient(2px 2px at 42% 82%, rgba(255,255,255,0.3), transparent 60%);
  pointer-events: none;
  opacity: 0.6;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: #0a3a36;
  background: rgba(204, 251, 239, 0.92);
  padding: 6px 12px;
  border-radius: 999px;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
  box-shadow: 0 6px 18px rgba(45, 212, 191, 0.25);
}

.hero-title {
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 800;
  margin: 0 0 22px;
  color: #ffffff;
}

.hero-sub {
  font-size: clamp(16px, 1.6vw, 19px);
  color: rgba(234, 255, 251, 0.82);
  margin: 0;
  max-width: 620px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: transform .12s ease, background .2s ease, border-color .2s ease, color .2s ease, box-shadow .2s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 8px 22px rgba(13, 148, 136, 0.45);
}
.btn-primary:hover {
  background: var(--brand-strong);
  color: #fff;
  box-shadow: 0 10px 26px rgba(15, 118, 110, 0.55);
}

.btn-ghost {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--brand);
  color: var(--brand-strong);
}

.btn-sm {
  height: 36px;
  padding: 0 16px;
  font-size: 14px;
  border-radius: 8px;
}
.btn-primary.btn-sm {
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.35);
}
@media (max-width: 720px) {
  .btn-sm { padding: 0 13px; font-size: 13px; }
}

/* Wave transition under hero */
.hero-deco {
  position: absolute;
  inset: auto 0 -1px 0;
  height: 80px;
  background:
    radial-gradient(60% 100% at 20% 100%, rgba(45, 212, 191, 0.35), transparent 70%),
    radial-gradient(60% 100% at 80% 100%, rgba(6, 182, 212, 0.3), transparent 70%);
  pointer-events: none;
}

/* Sections */
.section {
  padding: 96px 0;
  scroll-margin-top: 80px;
}
.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 680px;
  margin: 0 0 56px;
}

.section-kicker {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--brand-strong);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.kicker-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.kicker-row .section-kicker {
  margin: 0;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--brand-strong);
  background: var(--brand-soft);
  padding: 4px 10px;
  border-radius: 999px;
  line-height: 1.4;
}
.status-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  margin-right: 7px;
}

.section-title {
  font-size: clamp(28px, 3.2vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 18px;
}

.section-lede {
  font-size: 17px;
  color: var(--text-muted);
  margin: 0;
}

/* Feature cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand-bright);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-strong) 100%);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  box-shadow: 0 6px 16px rgba(13, 148, 136, 0.25);
}
.feature-card:nth-child(2) .feature-icon {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  box-shadow: 0 6px 16px rgba(6, 182, 212, 0.25);
}
.feature-card:nth-child(3) .feature-icon {
  background: linear-gradient(135deg, var(--brand-bright) 0%, var(--brand) 100%);
  box-shadow: 0 6px 16px rgba(45, 212, 191, 0.3);
}
.feature-icon svg { width: 24px; height: 24px; }

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
}

@media (max-width: 860px) {
  .feature-grid { grid-template-columns: 1fr; }
}

/* Contact */
.contact-inner {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.contact-inner .section-title { margin-bottom: 12px; }

.contact-body {
  color: var(--text-muted);
  font-size: 17px;
  margin: 0 0 28px;
}

.contact-email {
  display: inline-block;
  font-size: clamp(15px, 1.4vw, 17px);
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.005em;
  padding: 14px 22px;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-strong) 100%);
  box-shadow: 0 8px 22px rgba(13, 148, 136, 0.28);
  transition: transform .12s ease, box-shadow .2s ease;
}
.contact-email:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(15, 118, 110, 0.35);
}

/* Footer */
.site-footer {
  padding: 40px 0 48px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  background: #fff;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
  font-size: 15px;
}
.footer-meta {
  margin: 0;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.footer-meta .dot { opacity: 0.5; }
.footer-meta a:hover { color: var(--brand-strong); }
.footer-copy {
  margin: 0;
  font-size: 13px;
  opacity: 0.8;
}