:root {
  --brand: #0e9384;
  --brand-dark: #0b7a6e;
  --brand-soft: #e8f6f4;
  --ink: #16202a;
  --ink-soft: #56636f;
  --line: #e4e8ec;
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --radius: 14px;
  --maxw: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: block;
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 8px;
}

.nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 15px;
}

.nav a:hover { color: var(--brand); }

.lang-switch select {
  font: inherit;
  font-size: 14px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

/* ---------- hero ---------- */
.hero {
  padding: 72px 0 56px;
  text-align: center;
  background: linear-gradient(180deg, var(--brand-soft) 0%, rgba(232, 246, 244, 0) 100%);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: 40px;
  line-height: 1.25;
  letter-spacing: -.5px;
}

.hero p {
  margin: 0 auto 30px;
  max-width: 620px;
  font-size: 18px;
  color: var(--ink-soft);
}

.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: background .15s ease, transform .15s ease;
}

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

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.btn-outline {
  background: #fff;
  color: var(--brand);
  border: 1.5px solid var(--brand);
}

.btn-outline:hover { background: var(--brand-soft); }

.hero-note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--ink-soft);
}

/* ---------- sections ---------- */
section { padding: 64px 0; }

.section-title {
  margin: 0 0 8px;
  font-size: 28px;
  text-align: center;
}

.section-sub {
  margin: 0 0 40px;
  text-align: center;
  color: var(--ink-soft);
}

/* features */
.features {
  background: var(--bg-soft);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

/* steps */
.steps {
  max-width: 720px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 0 0 26px 52px;
  counter-increment: step;
  border-left: 2px solid var(--line);
  margin-left: 13px;
}

.steps li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: -14px;
  top: 0;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* faq */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}

.faq-item:first-child { border-top: 1px solid var(--line); }

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.faq-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

/* final cta */
.cta-band {
  background: var(--brand-soft);
  text-align: center;
}

.cta-band h2 {
  margin: 0 0 8px;
  font-size: 26px;
}

.cta-band p {
  margin: 0 0 24px;
  color: var(--ink-soft);
}

/* ---------- privacy page ---------- */
.privacy {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.privacy h1 {
  margin: 0 0 6px;
  font-size: 32px;
}

.privacy .updated {
  margin: 0 0 28px;
  color: var(--ink-soft);
  font-size: 14px;
}

.privacy .lede {
  font-size: 17px;
  color: var(--ink-soft);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}

.privacy h2 {
  margin: 34px 0 8px;
  font-size: 20px;
}

.privacy p {
  margin: 0;
  color: var(--ink-soft);
}

.privacy a { color: var(--brand); }

.back-link {
  display: inline-block;
  margin-bottom: 28px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
}

.back-link:hover { color: var(--brand); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
}

.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
  margin-left: 18px;
}

.site-footer a:hover { color: var(--brand); }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .header-inner { height: auto; padding: 12px 0; flex-wrap: wrap; }
  .nav { gap: 16px; margin-left: 0; order: 3; width: 100%; }
  .lang-switch { margin-left: auto; }
  .hero { padding: 48px 0 36px; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 16px; }
  section { padding: 44px 0; }
  .privacy { padding: 36px 20px 56px; }
  .privacy h1 { font-size: 26px; }
}