:root {
  color-scheme: light;
  --green: #16a56a;
  --green-dark: #087a4b;
  --ink: #17352a;
  --muted: #64776f;
  --line: #d9e9e1;
  --paper: rgba(255, 255, 255, 0.92);
  font-family: "Microsoft YaHei UI", "PingFang SC", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 15%, rgba(71, 205, 143, 0.22), transparent 31rem),
    radial-gradient(circle at 85% 80%, rgba(254, 211, 118, 0.2), transparent 28rem),
    linear-gradient(145deg, #f5fcf8 0%, #eef8f3 52%, #fbf8ee 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  background-image: radial-gradient(#79b79b 0.75px, transparent 0.75px);
  background-size: 22px 22px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

.page-shell {
  width: min(1040px, calc(100% - 40px));
  min-height: calc(100vh - 58px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  align-items: center;
  gap: clamp(42px, 7vw, 92px);
  padding: 64px 0 36px;
}

.intro { padding-left: 8px; }

.brand-mark {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  margin-bottom: 26px;
  border-radius: 18px;
  background: linear-gradient(145deg, #29c986, #079358);
  box-shadow: 0 14px 28px rgba(8, 143, 84, 0.22);
}

.brand-mark svg { width: 37px; fill: white; }

.eyebrow {
  margin: 0 0 13px;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.22em;
}

h1 {
  max-width: 520px;
  margin: 0;
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.subtitle {
  margin: 23px 0 30px;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
}

.benefits {
  display: grid;
  gap: 15px;
  margin: 0 0 31px;
  padding: 0;
  list-style: none;
}

.benefits li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  font-weight: 650;
}

.benefits li::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border: 5px solid rgba(22, 165, 106, 0.16);
  border-radius: 50%;
  background: var(--green);
  background-clip: padding-box;
}

.privacy-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  color: #74867e;
  font-size: 13px;
}

.privacy-note span { color: var(--green); font-weight: 900; }

.join-card {
  position: relative;
  padding: 30px 34px 31px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 30px;
  background: var(--paper);
  box-shadow: 0 26px 70px rgba(31, 89, 64, 0.14), 0 2px 8px rgba(31, 89, 64, 0.06);
  backdrop-filter: blur(18px);
}

.card-heading {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 7px 13px;
  color: var(--green-dark);
  border-radius: 999px;
  background: #ebfaf2;
  font-size: 12px;
  font-weight: 750;
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(22, 165, 106, 0.12);
}

h2 { margin: 0; font-size: 25px; letter-spacing: -0.02em; }

.card-help { margin: 10px 0 21px; color: var(--muted); font-size: 14px; }
.mobile-help { display: none; }

.qr-frame {
  position: relative;
  display: block;
  width: min(100%, 292px);
  aspect-ratio: 1;
  margin: 0 auto;
  padding: 16px;
  border: 0;
  border-radius: 22px;
  background: white;
  box-shadow: inset 0 0 0 1px #e7eee9, 0 12px 30px rgba(44, 92, 70, 0.09);
  cursor: zoom-in;
}

.qr-frame img { display: block; width: 100%; height: 100%; object-fit: contain; }

.corner { position: absolute; width: 24px; height: 24px; border-color: var(--green); border-style: solid; }
.corner-tl { top: 7px; left: 7px; border-width: 3px 0 0 3px; border-radius: 8px 0 0; }
.corner-tr { top: 7px; right: 7px; border-width: 3px 3px 0 0; border-radius: 0 8px 0 0; }
.corner-bl { bottom: 7px; left: 7px; border-width: 0 0 3px 3px; border-radius: 0 0 0 8px; }
.corner-br { right: 7px; bottom: 7px; border-width: 0 3px 3px 0; border-radius: 0 0 8px; }

.qr-status { margin: 18px 0 13px; color: #84948d; font-size: 12px; }

.save-button {
  display: none;
  padding: 12px 20px;
  color: white;
  border: 0;
  border-radius: 13px;
  background: var(--green);
  cursor: pointer;
  font-weight: 750;
  text-decoration: none;
}

.support { margin: 16px 0 0; color: #9aa8a1; font-size: 12px; }

footer { height: 58px; color: #8a9a92; text-align: center; font-size: 12px; }

.qr-dialog {
  width: min(90vw, 460px);
  padding: 28px;
  text-align: center;
  border: 0;
  border-radius: 24px;
  box-shadow: 0 24px 80px rgba(9, 49, 31, 0.3);
}

.qr-dialog::backdrop { background: rgba(4, 29, 18, 0.7); backdrop-filter: blur(5px); }
.qr-dialog p { margin: 0 0 18px; font-weight: 750; }
.qr-dialog img { width: 100%; border-radius: 12px; }
.dialog-close { position: absolute; top: 8px; right: 12px; border: 0; background: transparent; color: #718078; font-size: 28px; cursor: pointer; }

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 28px, 480px);
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 36px 0 24px;
  }
  .intro { padding: 0 6px; text-align: center; }
  .brand-mark { width: 51px; height: 51px; margin: 0 auto 19px; border-radius: 16px; }
  .eyebrow { margin-bottom: 9px; }
  h1 { font-size: clamp(33px, 10vw, 45px); }
  .subtitle { margin: 15px 0 22px; font-size: 16px; }
  .benefits { width: fit-content; margin: 0 auto 23px; text-align: left; }
  .privacy-note { font-size: 12px; }
  .join-card { padding: 26px 20px 27px; border-radius: 25px; }
  h2 { font-size: 23px; }
  .desktop-help { display: none; }
  .mobile-help { display: block; }
  .qr-frame { width: min(100%, 315px); }
  .save-button { display: inline-block; }
}

@media (prefers-reduced-motion: no-preference) {
  .join-card { animation: rise 560ms cubic-bezier(.2,.8,.2,1) both; }
  .intro { animation: rise 480ms 80ms cubic-bezier(.2,.8,.2,1) both; }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } }
}