/* Landinbox landing — hand-written, no framework, no JS */

:root {
  --ink: #0f172a;
  --muted: #475569;
  --bg: #ffffff;
  --soft: #f6f8fa;
  --line: #e2e8f0;
  --accent: #047857;
  --accent-dark: #065f46;
  --accent-soft: #ecfdf5;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 760px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; font-weight: 700; }

h1 { font-size: clamp(2.1rem, 5vw, 3.3rem); }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); text-align: center; }
h3 { font-size: 1.08rem; }

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

/* ---------- nav ---------- */

.nav { border-bottom: 1px solid var(--line); background: var(--bg); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1.05rem; color: var(--ink);
}
.brand:hover { text-decoration: none; color: var(--accent); }
.brand-mark { width: 22px; height: 22px; color: var(--accent); }
.nav-links { display: flex; gap: 22px; font-size: 0.95rem; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--ink); text-decoration: none; }

/* ---------- hero ---------- */

.hero { padding: 92px 0 76px; text-align: center; }
.eyebrow {
  display: inline-block;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--accent);
  background: var(--accent-soft);
  padding: 5px 14px; border-radius: 999px; margin-bottom: 22px;
}
.lede {
  font-size: 1.14rem; color: var(--muted);
  max-width: 640px; margin: 20px auto 0;
}
.cta-row {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
  margin-top: 34px;
}
.fineprint { margin-top: 16px; font-size: 0.85rem; color: var(--muted); }

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  background: var(--accent); color: #fff;
  font-weight: 600; font-size: 0.98rem;
  padding: 12px 24px; border-radius: 8px;
  transition: background 0.15s ease;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }
.btn.ghost {
  background: transparent; color: var(--accent);
  border: 1px solid var(--accent);
}
.btn.ghost:hover { background: var(--accent-soft); color: var(--accent-dark); }
.btn.block { display: block; text-align: center; margin-top: 20px; }
.btn.disabled {
  background: var(--soft); color: var(--muted);
  border: 1px solid var(--line); cursor: default;
}
.btn:focus-visible, a:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

/* ---------- sections ---------- */

.section { padding: 72px 0; }
.section.soft { background: var(--soft); }
.section-sub {
  text-align: center; color: var(--muted);
  max-width: 560px; margin: 14px auto 44px;
}

/* ---------- cards ---------- */

.grid { display: grid; gap: 20px; }
.grid.four { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
}
.section.soft .card { background: var(--bg); }

.card h3 { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.card .num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  font-size: 0.9rem; flex: none;
  transform: translateY(3px);
}
.card p { color: var(--muted); font-size: 0.95rem; }

/* ---------- pricing ---------- */

.price-card { display: flex; flex-direction: column; }
.price-card h3 { font-size: 1.15rem; }
.price { font-size: 1.9rem; font-weight: 700; margin: 6px 0 2px; }
.price.coming { color: var(--muted); font-size: 1.4rem; }
.price .per { font-size: 0.85rem; font-weight: 400; color: var(--muted); margin-left: 6px; }
.price-note { font-size: 0.88rem; color: var(--accent); font-weight: 600; margin-bottom: 14px; }
.price-card ul { list-style: none; font-size: 0.93rem; color: var(--muted); }
.price-card li { padding: 7px 0 7px 24px; position: relative; }
.price-card li::before {
  content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700;
}
.price-card .btn { margin-top: auto; }

.price-card.featured {
  border: 2px solid var(--accent);
  position: relative;
  background: linear-gradient(180deg, var(--accent-soft), var(--bg) 55%);
}
.badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.03em;
  padding: 4px 14px; border-radius: 999px; white-space: nowrap;
}

/* ---------- faq ---------- */

details { border-bottom: 1px solid var(--line); }
details:first-of-type { border-top: 1px solid var(--line); margin-top: 8px; }
summary {
  cursor: pointer; font-weight: 600;
  padding: 18px 0; list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::before {
  content: "+"; display: inline-block;
  width: 1.2em; color: var(--accent); font-weight: 700;
}
details[open] summary::before { content: "–"; }
details p { color: var(--muted); padding: 0 0 18px 1.2rem; font-size: 0.96rem; }

/* ---------- footer ---------- */

.footer { background: var(--soft); border-top: 1px solid var(--line); padding: 48px 0 56px; text-align: center; }
.promise { font-weight: 600; font-size: 1.02rem; }
.footer-links { display: flex; justify-content: center; gap: 22px; margin-top: 14px; font-size: 0.92rem; }
.lang-zh { margin-top: 18px; color: var(--muted); font-size: 0.9rem; }
.copyright { margin-top: 8px; color: var(--muted); font-size: 0.82rem; }

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .hero { padding: 64px 0 56px; }
  .nav-links { gap: 14px; font-size: 0.9rem; }
  .section { padding: 52px 0; }
}