:root {
  color-scheme: light;
  --ink: #123b4b;
  --muted: #647c86;
  --teal: #0d8e91;
  --teal-dark: #087174;
  --mint: #dff5f1;
  --blue: #e7f4fb;
  --line: #d7e6e8;
  --paper: #ffffff;
  --danger: #bb3d47;
  --shadow: 0 26px 70px rgba(22, 73, 85, .15);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: #edf8f8; }
body { min-height: 100vh; margin: 0; color: var(--ink); background: radial-gradient(circle at 12% 8%, #ccefea 0, transparent 34%), linear-gradient(145deg, #f6fcfc 0%, #edf6fa 100%); }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--teal-dark); }

.page-shell { width: min(1120px, calc(100% - 32px)); min-height: calc(100vh - 66px); margin: 0 auto; padding: clamp(28px, 6vw, 72px) 0 40px; display: grid; grid-template-columns: .92fr 1.08fr; gap: clamp(28px, 5vw, 72px); align-items: center; }
.brand-panel { padding: clamp(8px, 3vw, 34px); }
.brand { display: flex; align-items: center; gap: 12px; font-size: 1.06rem; font-weight: 800; }
.brand-mark { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 14px; color: white; background: linear-gradient(145deg, #11a9a1, #147a91); box-shadow: 0 12px 25px rgba(13, 142, 145, .24); }
.brand-copy { margin: clamp(48px, 8vw, 92px) 0 42px; }
.eyebrow { margin: 0 0 8px; color: var(--teal); font-size: .82rem; font-weight: 850; letter-spacing: .16em; }
h1 { max-width: 9em; margin: 0; font-size: clamp(2.25rem, 5vw, 4.65rem); line-height: 1.08; letter-spacing: -.055em; }
.brand-copy > p:last-child { max-width: 34rem; margin: 24px 0 0; color: var(--muted); font-size: 1.04rem; line-height: 1.9; }
.steps { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.steps li { display: flex; align-items: center; gap: 14px; padding: 13px 15px; border: 1px solid rgba(13, 142, 145, .12); border-radius: 15px; background: rgba(255,255,255,.58); backdrop-filter: blur(10px); }
.steps li > span { width: 34px; height: 34px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 10px; color: var(--teal-dark); background: var(--mint); font-weight: 900; }
.steps div { display: grid; gap: 3px; }
.steps strong { font-size: .96rem; }
.steps small { color: var(--muted); font-size: .79rem; }

.action-panel { position: relative; padding: clamp(22px, 4vw, 36px); border: 1px solid rgba(255,255,255,.8); border-radius: 28px; background: rgba(255,255,255,.88); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.invite-card { display: flex; align-items: center; gap: 12px; min-height: 58px; margin-bottom: 24px; padding: 12px 15px; border: 1px solid #bfe3df; border-radius: 15px; background: linear-gradient(120deg, #effbf8, #f2f9fd); }
.invite-label { color: var(--muted); font-size: .84rem; }
.invite-card strong { color: var(--teal-dark); font-size: 1.18rem; letter-spacing: .08em; }
.invite-state { margin-left: auto; padding: 5px 9px; border-radius: 999px; color: var(--teal-dark); background: var(--mint); font-size: .74rem; font-weight: 800; }
.copy-button { flex: 0 0 auto; min-height: 34px; padding: 0 10px; border: 1px solid #b9ddda; border-radius: 9px; color: var(--teal-dark); background: white; font-size: .74rem; font-weight: 800; cursor: pointer; }
.copy-button:hover { background: var(--mint); }
.invite-card.invalid { border-color: #edc8cc; background: #fff7f7; }
.invite-card.invalid strong, .invite-card.invalid .invite-state { color: var(--danger); }
.invite-card.invalid .invite-state { background: #fdebed; }
.form-head h2, .success-card h2 { margin: 0; font-size: 1.65rem; letter-spacing: -.03em; }
.form-head > p:last-child, .success-card p { margin: 8px 0 0; color: var(--muted); line-height: 1.65; }
.register-card { display: grid; gap: 15px; }
.register-card label { display: grid; gap: 7px; color: #345665; font-size: .9rem; font-weight: 750; }
input { width: 100%; min-height: 48px; padding: 0 14px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink); background: #fbfdfd; outline: none; transition: border-color .16s, box-shadow .16s, background .16s; }
input:focus { border-color: var(--teal); background: white; box-shadow: 0 0 0 4px rgba(13,142,145,.11); }
.agreement { grid-template-columns: auto 1fr; align-items: start; gap: 10px !important; color: var(--muted) !important; font-size: .82rem !important; font-weight: 550 !important; line-height: 1.55; }
.agreement input { width: 20px; min-height: 20px; height: 20px; margin: 1px 0 0; accent-color: var(--teal); }
.form-message { min-height: 22px; margin: -3px 0 -4px; color: var(--danger); font-size: .83rem; line-height: 1.5; }
.form-message[data-state="ok"] { color: var(--teal-dark); }
.form-message[data-state="warning"] { color: #8a6515; }
.primary-button, .secondary-button { min-height: 49px; display: inline-flex; align-items: center; justify-content: center; border: 0; border-radius: 12px; text-decoration: none; font-weight: 850; cursor: pointer; }
.primary-button { width: 100%; padding: 0 20px; color: white; background: linear-gradient(135deg, #0d9793, #167992); box-shadow: 0 12px 24px rgba(13, 142, 145, .2); }
.primary-button:hover { filter: brightness(.97); transform: translateY(-1px); }
.primary-button:disabled { cursor: wait; opacity: .65; transform: none; }
.secondary-button { flex: 0 0 auto; min-height: 42px; padding: 0 15px; color: var(--teal-dark); background: var(--mint); }
.success-card { padding: 26px 0 8px; text-align: center; }
.success-card .primary-button { margin-top: 24px; }
.success-next { margin: 15px 0 0 !important; font-size: .8rem; }
.success-icon { width: 58px; height: 58px; display: grid; place-items: center; margin: 0 auto 18px; border-radius: 18px; color: white; background: var(--teal); font-size: 1.8rem; font-weight: 900; }
.download-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
.download-row div { display: grid; gap: 4px; }
.download-row strong { font-size: .9rem; }
.download-row span { color: var(--muted); font-size: .76rem; line-height: 1.5; }
.info-card, .policy-card { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
.info-card-head h2 { margin: 0; font-size: 1.25rem; letter-spacing: -.02em; }
.rule-list { display: grid; gap: 8px; margin: 15px 0 0; padding-left: 1.2rem; color: #42616c; font-size: .82rem; line-height: 1.6; }
.rule-note { margin: 12px 0 0; color: var(--muted); font-size: .76rem; line-height: 1.55; }
.policy-card { display: grid; gap: 8px; }
.policy-card details { border: 1px solid var(--line); border-radius: 11px; background: #fbfdfd; }
.policy-card summary { padding: 10px 12px; color: var(--teal-dark); font-size: .84rem; font-weight: 800; cursor: pointer; }
.policy-card details p { margin: 0; padding: 0 12px 12px; color: var(--muted); font-size: .76rem; line-height: 1.65; }
.primary-button:focus-visible, .secondary-button:focus-visible, .copy-button:focus-visible, input:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid rgba(13,142,145,.35); outline-offset: 2px; }
footer { min-height: 66px; display: grid; place-items: center; color: var(--muted); font-size: .78rem; }
[hidden] { display: none !important; }

@media (max-width: 820px) {
  .page-shell { width: min(620px, calc(100% - 24px)); grid-template-columns: 1fr; gap: 24px; padding-top: 22px; }
  .brand-panel { padding: 4px 4px 0; }
  .brand-copy { margin: 42px 0 28px; }
  h1 { max-width: 11em; font-size: clamp(2.35rem, 11vw, 4rem); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .steps li { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 560px) {
  .page-shell { width: 100%; padding: 18px 14px 28px; }
  .brand-copy { margin: 36px 0 24px; }
  .brand-copy > p:last-child { font-size: 1rem; }
  .steps { grid-template-columns: 1fr; }
  .steps li { flex-direction: row; }
  .action-panel { padding: 20px 16px; border-radius: 22px; }
  .invite-card { align-items: flex-start; flex-wrap: wrap; }
  .invite-state { margin-left: 0; }
  .copy-button { margin-left: auto; }
  .download-row { align-items: stretch; flex-direction: column; }
  .secondary-button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}