:root {
  --night: #071a33;
  --night-soft: #0d2b50;
  --blue: #2b7cff;
  --cyan: #57d9f1;
  --paper: #f3f6fa;
  --ink: #13213a;
  --muted: #68758a;
  --line: #e1e8f1;
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Songti SC", "STSong", "Noto Serif CJK SC", "PingFang SC", serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: transparent; }
button, summary { -webkit-tap-highlight-color: transparent; }

.wechat-tip {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 16px;
  color: #09203d;
  background: #82e6f5;
  font-family: "PingFang SC", sans-serif;
  font-size: 13px;
}
.wechat-tip span { font-size: 18px; letter-spacing: 2px; }

.topbar {
  position: absolute;
  z-index: 5;
  top: 0;
  left: 50%;
  width: min(100% - 36px, 760px);
  height: 78px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--white);
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand img { border-radius: 13px; box-shadow: 0 10px 28px rgba(35, 128, 255, .24); }
.brand span { display: flex; flex-direction: column; }
.brand strong { font-size: 18px; letter-spacing: .12em; }
.brand small { margin-top: 4px; color: rgba(255,255,255,.54); font-size: 10px; letter-spacing: .08em; }
.secure-pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 11px; border: 1px solid rgba(255,255,255,.18); border-radius: 999px;
  color: rgba(255,255,255,.78); background: rgba(255,255,255,.06);
  font-family: "PingFang SC", sans-serif; font-size: 11px;
}
.secure-pill i { width: 6px; height: 6px; border-radius: 50%; background: #56e3bb; box-shadow: 0 0 0 4px rgba(86,227,187,.12); }

.hero {
  position: relative;
  overflow: hidden;
  min-height: 720px;
  padding: 126px 24px 76px;
  color: var(--white);
  background: linear-gradient(155deg, #06162c 0%, #092342 58%, #0d315a 100%);
}
.hero-grid { position: absolute; inset: 0; opacity: .12; background-image: linear-gradient(rgba(255,255,255,.13) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.13) 1px, transparent 1px); background-size: 42px 42px; mask-image: linear-gradient(#000, transparent 88%); }
.glow { position: absolute; border-radius: 50%; filter: blur(2px); }
.glow-one { width: 360px; height: 360px; top: 52px; right: -170px; border: 1px solid rgba(83,217,244,.27); box-shadow: inset 0 0 80px rgba(43,124,255,.08); }
.glow-two { width: 190px; height: 190px; top: 168px; left: -96px; background: rgba(43,124,255,.12); filter: blur(24px); }
.hero-content { position: relative; width: min(100%, 560px); margin: 0 auto; text-align: center; animation: rise .8s cubic-bezier(.2,.75,.25,1) both; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
.app-icon-wrap { position: relative; display: inline-block; }
.app-icon { border: 1px solid rgba(255,255,255,.2); border-radius: 28px; box-shadow: 0 26px 68px rgba(0,0,0,.36); }
.ios-chip { position: absolute; right: -11px; bottom: 4px; padding: 5px 8px; border: 2px solid #102e52; border-radius: 8px; color: #0a2342; background: var(--cyan); font-family: "PingFang SC", sans-serif; font-size: 10px; font-weight: 800; }
.overline { margin: 26px 0 12px; color: var(--cyan); font-family: "PingFang SC", sans-serif; font-size: 11px; font-weight: 700; letter-spacing: .22em; }
h1 { margin: 0; font-size: clamp(38px, 10vw, 58px); line-height: 1.12; letter-spacing: -.04em; }
h1 em { color: transparent; background: linear-gradient(90deg, #fff, #7ee5f6); background-clip: text; font-style: normal; }
.lead { max-width: 440px; margin: 20px auto 0; color: rgba(255,255,255,.66); font-family: "PingFang SC", sans-serif; font-size: 15px; line-height: 1.8; }
.release-meta { display: flex; align-items: center; justify-content: center; gap: 9px; margin: 22px 0; color: rgba(255,255,255,.48); font-family: "PingFang SC", sans-serif; font-size: 11px; }
.release-meta i { width: 3px; height: 3px; border-radius: 50%; background: rgba(255,255,255,.28); }
.install-button { display: flex; align-items: center; gap: 13px; width: min(100%, 390px); min-height: 76px; margin: 0 auto; padding: 13px 18px; border-radius: 19px; color: #071a33; background: linear-gradient(135deg, #78e9f7, #38c7ea); box-shadow: 0 20px 48px rgba(37,193,233,.26); text-align: left; transition: transform .2s ease, box-shadow .2s ease; }
.install-button:active { transform: scale(.985); box-shadow: 0 10px 28px rgba(37,193,233,.2); }
.install-button .apple { width: 38px; font-family: sans-serif; font-size: 35px; line-height: 1; }
.install-button > span:nth-child(2) { display: flex; flex: 1; flex-direction: column; }
.install-button strong { font-family: "PingFang SC", sans-serif; font-size: 17px; }
.install-button small { margin-top: 4px; color: rgba(7,26,51,.62); font-family: "PingFang SC", sans-serif; font-size: 11px; }
.install-button svg { width: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.device-note { margin: 14px 0 0; color: rgba(255,255,255,.5); font-family: "PingFang SC", sans-serif; font-size: 11px; }
.ipa-link { display: inline-block; margin-top: 17px; border-bottom: 1px solid rgba(255,255,255,.25); color: rgba(255,255,255,.65); font-family: "PingFang SC", sans-serif; font-size: 12px; }

.section-card { width: min(calc(100% - 32px), 720px); margin: 20px auto 0; padding: 32px 24px; border: 1px solid var(--line); border-radius: 24px; background: var(--white); box-shadow: 0 18px 48px rgba(28,52,85,.07); }
.trust-card { position: relative; margin-top: -34px; }
.section-heading > span { color: var(--blue); font-family: "PingFang SC", sans-serif; font-size: 10px; font-weight: 800; letter-spacing: .17em; }
.section-heading h2 { margin: 8px 0 9px; font-size: 28px; letter-spacing: -.03em; }
.section-heading p { margin: 0; color: var(--muted); font-family: "PingFang SC", sans-serif; font-size: 13px; line-height: 1.7; }
.steps { display: grid; gap: 0; margin: 25px 0; padding: 0; list-style: none; }
.steps li { position: relative; display: grid; grid-template-columns: 48px 1fr; gap: 13px; min-height: 88px; }
.steps li:not(:last-child)::after { position: absolute; content: ""; top: 36px; bottom: 5px; left: 19px; width: 1px; background: var(--line); }
.steps li > span { position: relative; z-index: 1; display: grid; place-items: center; align-self: start; width: 39px; height: 39px; border-radius: 12px; color: var(--blue); background: #ebf3ff; font-family: "PingFang SC", sans-serif; font-size: 11px; font-weight: 800; }
.steps strong { display: block; margin: 2px 0 6px; font-size: 16px; }
.steps p { margin: 0; color: var(--muted); font-family: "PingFang SC", sans-serif; font-size: 13px; line-height: 1.65; }
.path-row { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; padding: 14px; border-radius: 13px; color: #29405f; background: #f4f7fb; font-family: "PingFang SC", sans-serif; font-size: 11px; }
.path-row i { color: #9aa7b8; font-size: 16px; font-style: normal; }

.section-heading.compact { margin-bottom: 18px; }
.help details { border-top: 1px solid var(--line); font-family: "PingFang SC", sans-serif; }
.help summary { position: relative; padding: 18px 30px 18px 0; cursor: pointer; list-style: none; font-size: 14px; font-weight: 700; }
.help summary::-webkit-details-marker { display: none; }
.help summary::after { position: absolute; content: "+"; right: 2px; top: 14px; color: var(--blue); font-size: 22px; font-weight: 400; transition: transform .2s ease; }
.help details[open] summary::after { transform: rotate(45deg); }
.help details p { margin: -5px 0 18px; color: var(--muted); font-size: 12px; line-height: 1.75; }
.notice { width: min(calc(100% - 32px), 720px); margin: 20px auto; padding: 18px 20px; border: 1px solid #dce7f5; border-radius: 16px; background: #eaf3ff; font-family: "PingFang SC", sans-serif; }
.notice strong { color: #1f5fac; font-size: 13px; }
.notice p { margin: 5px 0 0; color: #58708e; font-size: 11px; line-height: 1.7; }
footer { display: flex; align-items: center; justify-content: center; gap: 9px; padding: 25px 20px 38px; color: #8692a3; font-family: "PingFang SC", sans-serif; font-size: 11px; }
footer img { border-radius: 8px; }
footer p { margin: 0; color: #47566d; font-weight: 700; }
footer small { padding-left: 9px; border-left: 1px solid #d8e0ea; }

@media (max-width: 430px) {
  .topbar { width: calc(100% - 30px); }
  .secure-pill { padding: 7px 9px; }
  .hero { min-height: 690px; padding-inline: 18px; }
  .section-card { padding: 28px 20px; border-radius: 21px; }
  .release-meta { gap: 7px; }
}

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