:root {
  --bg: #ffffff;
  --ink: #16201b;
  --ink-soft: #5a655f;
  --ink-faint: #9aa39e;
  --accent: #2f8f6b;
  --accent-dark: #256f53;
  --accent-ink: #ffffff;
  --surface: #f3f7f5;
  --surface-2: #e9f0ec;
  --line: #e4e9e6;
  --maxw: 760px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

/* ---------- Top bar ---------- */
.topbar { border-bottom: 1px solid var(--line); background: var(--bg); }

.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.05rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.brand:hover { text-decoration: none; color: var(--ink); }

.brand-dot { width: 0.7rem; height: 0.7rem; border-radius: 50%; background: var(--accent); }

.nav-right { display: flex; align-items: center; gap: 1.1rem; }

.nav-link { font-weight: 500; font-size: 0.95rem; color: var(--ink-soft); }
.nav-link:hover { color: var(--accent); }

/* ---------- Language dropdown ---------- */
.lang-menu { position: relative; }
.lang-menu summary {
  list-style: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  line-height: 1;
  user-select: none;
}
.lang-menu summary::-webkit-details-marker { display: none; }
.lang-menu summary::marker { content: ""; }
.lang-menu[open] summary,
.lang-menu summary:hover { color: var(--accent); border-color: var(--accent); }

.lang-pop {
  position: absolute;
  right: 0;
  top: calc(100% + 0.4rem);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(22, 32, 27, 0.1);
  padding: 0.35rem;
  min-width: 9rem;
  z-index: 20;
}
.lang-pop a {
  display: block;
  padding: 0.45rem 0.6rem;
  border-radius: 7px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.lang-pop a:hover { background: var(--surface); color: var(--accent); text-decoration: none; }
.lang-pop a[aria-current="true"] { color: var(--accent); font-weight: 600; }

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(120% 100% at 0% 0%, var(--surface-2), var(--surface) 42%, #ffffff 100%);
  border-bottom: 1px solid var(--line);
}
.hero-inner { max-width: var(--maxw); margin: 0 auto; padding: 3.25rem 1.5rem 4rem; }
.hero-inner h1 {
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 1.1rem;
}
.tagline { font-size: 1.18rem; color: var(--ink-soft); max-width: 36rem; margin: 0 0 1.6rem; }
.badge {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: 999px;
}

/* ---------- Features ---------- */
.content { max-width: var(--maxw); margin: 0 auto; padding: 3.5rem 1.5rem; }
.features { display: grid; gap: 1.75rem; grid-template-columns: 1fr; }
@media (min-width: 660px) { .features { grid-template-columns: repeat(3, 1fr); gap: 2rem; } }
.feature h2 { font-size: 1.08rem; margin: 0 0 0.45rem; letter-spacing: -0.01em; }
.feature p { margin: 0; color: var(--ink-soft); font-size: 0.98rem; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 2rem 1.5rem 2.5rem; color: var(--ink-soft); font-size: 0.9rem; }
.footer-inner a { color: var(--ink-soft); }
.footer-inner a:hover { color: var(--accent); }
.footer-links { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; }
.fineprint { color: var(--ink-faint); font-size: 0.82rem; margin: 0.75rem 0 0; }

/* ---------- Legal pages ---------- */
.legal { max-width: var(--maxw); margin: 0 auto; padding: 2rem 1.5rem 4rem; }
.legal h1 { font-size: clamp(1.7rem, 5vw, 2.1rem); letter-spacing: -0.02em; margin: 0.5rem 0 0.4rem; }
.legal h2 { font-size: 1.18rem; margin-top: 2.1rem; letter-spacing: -0.01em; }
.legal p, .legal li { color: var(--ink-soft); }
.legal ul { padding-left: 1.2rem; }
.legal li { margin-bottom: 0.4rem; }
.legal .updated { color: var(--ink-faint); font-size: 0.9rem; margin-top: 0; }
.legal .back { display: inline-block; font-weight: 500; }

/* ---------- How it works ---------- */
.formula {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
}
.table-wrap { overflow-x: auto; margin: 0.8rem 0 1.2rem; }
.legal table { border-collapse: collapse; width: 100%; font-size: 0.93rem; }
.legal th, .legal td { text-align: left; padding: 0.45rem 0.7rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
.legal td:first-child, .legal th:first-child { white-space: normal; }
.legal th { font-weight: 600; background: var(--surface); }
.legal td { color: var(--ink-soft); }
.legal .note { color: var(--ink-faint); font-size: 0.9rem; }

/* ---------- How-it-works teaser (home) ---------- */
.howit-teaser {
  margin-top: 3rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem 1.75rem;
}
.howit-teaser h2 { font-size: 1.08rem; margin: 0 0 0.45rem; letter-spacing: -0.01em; }
.howit-teaser p { margin: 0 0 0.9rem; color: var(--ink-soft); font-size: 0.98rem; }
.howit-link { font-weight: 600; font-size: 0.95rem; }