:root {
  --primary: #10aec6;
  --primary-dark: #0d94a8;
  --bg: #f6f9f9;
  --surface: #ffffff;
  --text: #17303a;
  --text-muted: #5a7078;
  --border: #e4edee;
  --shadow: 0 1px 2px rgba(23, 48, 58, .04), 0 8px 24px rgba(23, 48, 58, .06);
  --radius: 16px;
  --maxw: 960px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 5vw, 40px);
  background: rgba(246, 249, 249, .85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand__mark { display: block; }

.brand__text { display: flex; flex-direction: column; line-height: 1.05; }

.brand__title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text);
}

.brand__subtitle {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--primary);
}

/* ---------- Language toggle ---------- */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
  box-shadow: var(--shadow);
}

.lang-toggle__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .03em;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}

.lang-toggle__btn:hover { color: var(--text); }

.lang-toggle__btn[aria-pressed="true"] {
  background: var(--primary);
  color: #fff;
}

.lang-toggle__sep {
  width: 1px;
  height: 16px;
  background: var(--border);
  margin: 0 2px;
}

/* ---------- Layout ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(16px, 5vw, 40px); }

.hero {
  text-align: center;
  padding: clamp(56px, 10vw, 104px) 0 clamp(32px, 6vw, 56px);
}

.hero__eyebrow {
  margin: 0 0 16px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--primary);
}

.hero__title {
  margin: 0 auto 20px;
  max-width: 16ch;
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -.03em;
  font-weight: 800;
}

.hero__lead {
  margin: 0 auto;
  max-width: 52ch;
  font-size: clamp(17px, 2.4vw, 20px);
  color: var(--text-muted);
}

.section { padding: clamp(32px, 6vw, 56px) 0; }

.section__title {
  margin: 0 0 12px;
  font-size: clamp(24px, 4vw, 32px);
  letter-spacing: -.02em;
  font-weight: 800;
}

.section__lead {
  margin: 0;
  max-width: 60ch;
  color: var(--text-muted);
  font-size: clamp(16px, 2vw, 18px);
}

/* ---------- Feature cards ---------- */
.cards {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  color: var(--primary);
  border-radius: 12px;
  background: rgba(16, 174, 198, .1);
  margin-bottom: 16px;
}

.card__icon svg { width: 24px; height: 24px; }

.card__title { margin: 0 0 8px; font-size: 18px; font-weight: 700; }

.card__text { margin: 0; color: var(--text-muted); font-size: 15px; }

/* ---------- Notice (in development) ---------- */
.notice {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(28px, 5vw, 44px);
  margin: clamp(24px, 5vw, 40px) 0;
}

.notice__badge {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(16, 174, 198, .12);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ---------- Contact ---------- */
.contact { text-align: center; }
.contact .section__lead { margin: 0 auto 24px; }

.btn {
  display: inline-block;
  padding: 14px 26px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(16, 174, 198, .3);
  transition: background .15s ease, transform .15s ease;
}

.btn:hover { background: var(--primary-dark); transform: translateY(-1px); }

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding: 28px clamp(16px, 5vw, 40px) 40px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

.site-footer__brand { margin-bottom: 16px; }
.site-footer .brand__subtitle { font-size: 12px; }

.site-footer__legal {
  margin: 0 0 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px 24px;
  font-size: 13px;
  line-height: 1.4;
}

.site-footer__legal > div { display: flex; gap: 6px; }

.site-footer__legal dt {
  margin: 0;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.site-footer__legal dt::after { content: ":"; }

.site-footer__legal dd { margin: 0; }

.site-footer__legal a { color: var(--primary-dark); text-decoration: none; }
.site-footer__legal a:hover { text-decoration: underline; }

.site-footer__copy { display: block; }