:root {
  color-scheme: light;
  --ink: #17211d;
  --muted: #62716a;
  --green: #087f5b;
  --green-dark: #056647;
  --green-soft: #e8f7f0;
  --paper: #f5f8f6;
  --surface: #ffffff;
  --line: #dbe6e0;
  --shadow: 0 22px 70px rgba(19, 55, 41, 0.12);
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 12% 8%, rgba(16, 151, 108, 0.12), transparent 28rem), linear-gradient(180deg, #f9fcfa 0%, var(--paper) 100%);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
a { color: inherit; }
.shell { width: min(100% - 28px, 760px); margin: 0 auto; padding: max(18px, env(safe-area-inset-top)) 0 max(32px, env(safe-area-inset-bottom)); }
.masthead { display: flex; align-items: center; justify-content: space-between; padding: 6px 2px 18px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 750; text-decoration: none; }
.brand-mark { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 11px 11px 11px 4px; color: white; background: var(--green); box-shadow: 0 8px 22px rgba(8, 127, 91, 0.24); }
.prototype { color: var(--muted); font-size: 13px; }
.workspace { overflow: hidden; border: 1px solid rgba(207, 223, 215, 0.9); border-radius: 28px; background: rgba(255, 255, 255, 0.94); box-shadow: var(--shadow); }
.intro { padding: clamp(28px, 7vw, 52px) clamp(22px, 7vw, 52px) 28px; }
.eyebrow { margin: 0 0 8px; color: var(--green); font-size: 13px; font-weight: 800; letter-spacing: 0.12em; }
h1 { margin: 0; max-width: 14em; font-size: clamp(30px, 7vw, 48px); line-height: 1.14; letter-spacing: -0.035em; }
.lead { margin: 18px 0 0; max-width: 38em; color: var(--muted); font-size: 17px; }
.privacy-strip { display: flex; gap: 12px; margin: 0 clamp(22px, 7vw, 52px); padding: 15px 17px; border: 1px solid #bfe6d6; border-radius: 16px; background: var(--green-soft); color: #245846; }
.privacy-strip p { margin: 0; }
.privacy-icon { display: grid; flex: 0 0 24px; height: 24px; place-items: center; border-radius: 50%; color: #fff; background: var(--green); font-weight: 800; }
.steps { margin: 0; padding: 20px clamp(22px, 7vw, 52px) 8px; list-style: none; }
.step { display: grid; grid-template-columns: 38px 1fr; gap: 14px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.step:last-child { border-bottom: 0; }
.step-number { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 12px; color: var(--green); background: #eef6f2; font-weight: 800; }
.step h2, .limits h2 { margin: 2px 0 5px; font-size: 19px; line-height: 1.35; }
.step p { margin: 0 0 15px; color: var(--muted); }
.book-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; border: 1px solid transparent; border-radius: 14px; padding: 10px 17px; font: inherit; font-weight: 730; text-decoration: none; cursor: pointer; transition: transform 120ms ease, background 120ms ease; }
.button:active { transform: scale(0.98); }
.button.primary { color: #fff; background: var(--green); }
.button.primary:hover { background: var(--green-dark); }
.button.secondary { color: var(--green-dark); border-color: #b9d9cc; background: #fff; }
.button.ghost { color: var(--green-dark); background: var(--green-soft); }
.limits { margin: 12px clamp(22px, 7vw, 52px) 32px; padding: 20px; border-radius: 18px; background: #f3f6f4; }
.limits ul { margin: 10px 0 0; padding-left: 1.25em; color: var(--muted); }
.limits li + li { margin-top: 6px; }
footer { display: flex; flex-wrap: wrap; gap: 18px; padding: 20px clamp(22px, 7vw, 52px) 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer a:hover { color: var(--green); }
@media (max-width: 520px) {
  .shell { width: min(100% - 18px, 760px); }
  .workspace { border-radius: 22px; }
  .step { grid-template-columns: 34px 1fr; gap: 11px; }
  .button { width: 100%; }
  .book-actions { display: grid; }
}
@media (prefers-reduced-motion: reduce) { .button { transition: none; } }