/* 布局、间距、动效数值照 instinct.com 的 marketing-site 样式取，字体换成思源宋体 */
@font-face {
  font-family: "Feel Serif";
  src: url(/fonts/serif-400.woff2) format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Feel Serif";
  src: url(/fonts/serif-600.woff2) format("woff2");
  font-weight: 600;
  font-display: swap;
}

:root {
  --color-onyx: #1f2322;
  --color-soot: #6f6a6c;
  --color-hairline: #e4e4e4;
  --color-sand-100: #f4efec;
  --color-sand-400: #e1d5cd;
  --color-sand-500: #d3c3b8;
  --color-teal: #73a89a;
  --color-wx: #07c160;
  --font-serif: "Feel Serif", "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  --space-xs: 8px;
  --space-reg: 16px;
  --space-xl: 20px;
  --space-2xl: 24px;
  --space-6xl: 64px;
  --text-default: 24px;
  --leading-body: 140%;
  --reaction-hidden-scale: 0;
  --ease-pop: linear(0, .092, .296, .528, .736, .897, 1.004, 1.063, 1.085, 1.084, 1.068, 1.049, 1.029, 1.014, 1.003, .996, .993, .993, .993, .995, .997, .998, .999, 1);
}
@media (prefers-reduced-motion: reduce) {
  :root { --reaction-hidden-scale: 1; }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { background: #fff; }
body {
  color: var(--color-onyx);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; height: auto; }
ul { list-style: none; }
::selection { background: var(--color-sand-100); color: var(--color-onyx); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--color-onyx); outline-offset: 6px; }

/* ---------- 首页 ---------- */
.site {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding: var(--space-reg);
}
.site-header { padding: 20px var(--space-reg); flex-shrink: 0; }
.site-header__home { display: block; width: fit-content; }
.site-header__home img { width: 28px; }

.home {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  gap: var(--space-6xl);
  padding: calc(var(--space-6xl) - 20px) var(--space-reg) 20px;
}
.home__intro {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: calc(var(--text-default) * 1.9);
  max-width: 41rem;
  margin-bottom: 20vh;
}
.home__intro > * {
  font-family: var(--font-serif);
  font-size: var(--text-default);
  line-height: var(--leading-body);
  letter-spacing: -.01em;
  font-weight: 400;
  text-box: trim-both cap alphabetic;
}
.home__intro strong, .home__intro .cta { font-weight: 600; }
.home__examples { position: relative; }

.home__task {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: calc(.12em + 2px);
  text-decoration-color: #1f232233;
  -webkit-tap-highlight-color: transparent;
}
.reaction-anchor { position: absolute; left: var(--reaction-x, 0); top: var(--reaction-y, 0); }
.reaction {
  position: absolute;
  bottom: 6px;
  left: 6px;
  display: grid;
  place-items: center;
  width: 35.6px;
  height: 35.6px;
  border-radius: 50%;
  background: var(--color-sand-400);
  pointer-events: none;
  opacity: 0;
  scale: var(--reaction-hidden-scale);
  transform-origin: 0 100%;
  transition: scale 0s .15s, opacity .15s;
}
.reaction__icon { width: 20px; height: 20px; scale: var(--reaction-hidden-scale); }
.reaction__icon > * { display: block; width: 100%; height: 100%; }
.home__task.is-reacting .reaction { opacity: 1; scale: 1; transition: scale .5s var(--ease-pop), opacity .12s; }
.home__task.is-reacting .reaction__icon { scale: 1; transition: scale .43s .07s var(--ease-pop); }
@media (hover: hover) {
  .home__task:hover .reaction { opacity: 1; scale: 1; transition: scale .5s var(--ease-pop), opacity .12s; }
  .home__task:hover .reaction__icon { scale: 1; transition: scale .43s .07s var(--ease-pop); }
  .home__task:hover { text-decoration-color: var(--color-onyx); }
}
.home__examples.is-warm .home__task :is(.reaction, .reaction__icon) { transition: none; }

.cta {
  text-decoration: underline .42em var(--color-sand-400);
  text-underline-offset: -.2em;
  text-decoration-skip-ink: none;
  transition: text-decoration-color .15s;
}
@media (hover: hover) {
  .cta:hover { text-decoration-color: var(--color-sand-500); }
}
.cta__chevron { display: inline-block; width: .9em; height: .9em; margin-left: .15em; vertical-align: -.14em; }
.cta__chevron svg { width: 100%; height: 100%; }

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-2xl);
  font-size: 13px;
  line-height: 1.2;
  letter-spacing: -.01em;
  white-space: nowrap;
}

/* 进场：页眉、正文各段、页脚依次上浮淡入 */
.js-reveal:not(.is-revealed) :is(.site-header, .home__intro > *, .legal-links) { opacity: 0; }
.js-reveal.is-revealed :is(.site-header, .home__intro > *, .legal-links) {
  animation: reveal .6s cubic-bezier(.22, 1, .36, 1) calc(var(--reveal, 0) * 90ms) both;
}
.home__intro > :nth-child(1) { --reveal: 1; }
.home__intro > :nth-child(2) { --reveal: 2; }
.home__intro > :nth-child(3) { --reveal: 3; }
.home__intro > :nth-child(4) { --reveal: 4; }
.legal-links { --reveal: 5; }
@keyframes reveal { from { opacity: 0; translate: 0 8px; } }
@media (prefers-reduced-motion: reduce) {
  .js-reveal.is-revealed :is(.site-header, .home__intro > *, .legal-links) { animation: reveal-fade .3s both; }
  @keyframes reveal-fade { from { opacity: 0; } }
}

@media (min-width: 80rem) {
  .site-header { padding: 20px var(--space-xl) 0; }
  .site-header__home img { width: 34px; }
  .home { padding-inline: var(--space-xl); padding-top: var(--space-6xl); }
}

/* ---------- 扫码页 ---------- */
.connect {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  padding: 32px 24px 60px;
}
.connect__back { align-self: flex-start; }
.connect__back img { width: 28px; }
.connect__panel { width: 100%; max-width: 425px; margin-top: 28px; }
.connect__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 36px;
  line-height: 1.2;
  letter-spacing: -.02em;
}
.connect__sub { margin-top: 14px; font-size: 17px; line-height: 1.5; color: var(--color-soot); }

.tabs { display: flex; justify-content: center; margin-top: 52px; border-bottom: 1px solid var(--color-hairline); }
.tab {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 50%;
  padding-bottom: 16px;
  font-size: 17px;
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--color-onyx);
  margin-bottom: -1px;
}
.tab svg { width: 30px; height: 30px; }

.qr-card {
  position: relative;
  width: 251px;
  height: 251px;
  margin: 26px auto 0;
  padding: 17px;
  border: 1px solid var(--color-hairline);
  border-radius: 14px;
  background: #fff;
}
.qr-card__code { width: 100%; height: 100%; transition: opacity .3s, filter .3s; }
.qr-card__code svg { width: 100%; height: 100%; }
.qr-card.is-loading .qr-card__code,
.qr-card.is-dim .qr-card__code { opacity: .12; filter: blur(2px); }
.qr-card__overlay {
  position: absolute;
  inset: 0;
  pointer-events: none; /* 手机上长按要按到二维码图本身，微信才会给"识别图中二维码" */
  display: grid;
  place-items: center;
  align-content: center;
  gap: 10px;
  text-align: center;
  font-size: 15px;
  color: var(--color-soot);
}
.qr-card__overlay img { width: 40px; }
.qr-card__spinner {
  width: 26px;
  height: 26px;
  border: 2px solid var(--color-hairline);
  border-top-color: var(--color-onyx);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { rotate: 360deg; } }

.connect__hint { margin-top: 26px; text-align: center; font-size: 17px; color: var(--color-soot); }
.status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 56px;
  margin-top: 20px;
  padding: 12px 18px;
  border: 1px solid var(--color-hairline);
  border-radius: 16px;
  font-size: 17px;
  font-weight: 600;
  text-align: center;
}
.status__dot { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--color-soot); }
.status[data-state="wait"] .status__dot { animation: pulse 1.6s ease-in-out infinite; }
.status[data-state="scanned"] .status__dot { background: #e0a31b; }
.status[data-state="confirmed"] .status__dot { background: var(--color-wx); }
.status[data-state="error"] .status__dot,
.status[data-state="expired"] .status__dot { background: #d2483f; }
@keyframes pulse { 50% { opacity: .25; } }
.status__action {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 4px;
}
@media (prefers-reduced-motion: reduce) {
  .qr-card__spinner, .status[data-state="wait"] .status__dot { animation: none; }
}
@media (min-width: 48rem) {
  .connect { padding-top: 60px; }
  .connect__panel { margin-top: 40px; }
}