:root {
  --brand: #4f46e5;
  --ink: #16181d;
  --muted: #6b7280;
  --line: #e8eaef;
  --bg: #f5f6f8;
  --pink: #e23b4a;
  --header: 64px;
  --bar: 64px;
  --page: 1080px;
  --side: 84px;
  --fs-hero: 32px;
  --lh-hero: 48px;
  --fs-section: 26px;
  --lh-section: 40px;
  --fs-title: 18px;
  --lh-title: 28px;
  --fs-body: 15px;
  --lh-body: 26px;
  --fs-btn: 16px;
  --fs-nav: 16px;
  --fs-meta: 14px;
  --fs-small: 12px;
}

* { box-sizing: border-box; }
html { background: #fff; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #fff;
  line-height: var(--lh-body);
  font-size: var(--fs-body);
  overflow-x: hidden;
}
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; }
img { max-width: 100%; display: block; }
.container,
.header-bar,
.download-bar-inner,
.copy {
  width: min(var(--page), calc(100% - 16px - var(--side)));
  margin-left: 16px;
  margin-right: var(--side);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(226, 232, 240, .9);
}
.header-bar {
  min-height: var(--header);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 700;
  font-size: 17px;
}
.logo svg { width: 28px; height: 28px; }
.menu-toggle {
  margin-left: auto;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
}
.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
}
.site-header.open .menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-header.open .menu-toggle span:nth-child(2) { opacity: 0; }
.site-header.open .menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-drawer {
  display: none;
  position: fixed;
  z-index: 38;
  left: 0;
  right: 0;
  top: var(--header);
  bottom: calc(var(--bar) + env(safe-area-inset-bottom));
  background: #fff;
  flex-direction: column;
}
.nav-drawer.is-on { display: flex; animation: rise-in .28s ease; }
.nav-drawer.is-leaving { display: flex; animation: rise-out .22s ease forwards; }
.nav-drawer nav { flex: 1; overflow: auto; }
.nav-label {
  margin: 0;
  padding: 14px 16px 6px;
  color: var(--muted);
  font-size: 12px;
}
.nav-item {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 0 20px;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-nav);
  color: #2c3444;
}
.nav-item.active { color: #3b6cff; font-weight: 700; background: #f5f8ff; }
.nav-account {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px 16px 16px;
  border-top: 1px solid var(--line);
  background: #fff;
}
.nav-account .btn { width: 100%; }
.nav-login,
.nav-signup {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: #3b6cff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.nav-signup { background: #3b6cff; color: #fff; border-color: transparent; }
.nav-account .signup-tip {
  grid-column: 1 / -1;
  order: -1;
  margin: 0;
  text-align: center;
  background: #eef3ff;
  color: #3b6cff;
  font-size: 12px;
  padding: 6px 8px;
  border-radius: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  border-radius: 8px;
  padding: 11px 16px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  background: var(--brand);
  color: #fff;
}
.btn-block { width: 100%; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-light { background: #fff; color: var(--brand); }
.btn-white { background: #fff; color: var(--brand); border-color: var(--line); }
.btn-ghost { background: #fff; color: var(--brand); }
.btn-lg { padding: 12px 16px; }

.hero {
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(255,255,255,.22), transparent 46%),
    linear-gradient(165deg, #2f2a86 0%, #4f46e5 58%, #6d63f2 100%);
  color: #fff;
  padding: 40px 0 36px;
  text-align: center;
}
.hero-copy { max-width: 640px; margin: 0 auto; }
.hero-copy .btn { margin-top: 22px; width: 100%; border-radius: 999px; padding: 12px 22px; }
.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 12px;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: .18em;
}
.hero h1 { margin: 0; font-size: 34px; line-height: 1.15; font-weight: 600; letter-spacing: -.03em; }
.hero-line { margin: 10px 0 0; font-size: 16px; font-weight: 500; letter-spacing: .12em; }
.hero p { margin: 14px auto 0; max-width: 460px; color: rgba(255,255,255,.78); font-size: 14px; }
.screen-wrap {
  position: relative;
  z-index: 1;
  padding: 28px 0 32px;
  background: #f6f7fb;
}
.phone {
  width: min(390px, 100%);
  margin: 0 auto;
  padding: 10px;
  border-radius: 40px;
  background: linear-gradient(180deg, #3a3d48, #16181e);
  box-shadow: 0 24px 50px rgba(24, 18, 64, .22), inset 0 0 0 1px rgba(255,255,255,.16);
}
.phone-screen {
  background: #f5f5f5;
  border-radius: 30px;
  overflow: hidden;
  color: var(--ink);
}
.phone-status, .phone-nav, .lang-bar, .composer-row {
  display: flex;
  align-items: center;
}
.phone-status {
  justify-content: space-between;
  padding: 12px 18px 2px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  background: #fff;
  color: #111;
}
.status-icons { font-size: 10px; letter-spacing: .12em; opacity: .9; }
.phone-nav {
  gap: 10px;
  padding: 6px 14px 12px;
  background: #fff;
  color: #111;
  border-bottom: 1px solid #eee;
}
.phone-nav img {
  width: 22px;
  height: 22px;
  padding: 6px;
  border-radius: 50%;
  background: #e9f9ef;
  box-sizing: content-box;
}
.phone-nav div { flex: 1; min-width: 0; }
.phone-nav strong { display: block; font-size: 15px; font-weight: 600; }
.phone-nav small { color: #06c755; font-size: 11px; }
.phone-nav em {
  font-style: normal;
  font-size: 11px;
  letter-spacing: .04em;
  color: #fff;
  background: #06c755;
  border-radius: 999px;
  padding: 3px 8px;
}
.lang-bar {
  justify-content: flex-start;
  gap: 8px;
  margin: 10px 12px 0;
  padding: 7px 8px 7px 12px;
  background: rgba(255,255,255,.92);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .06);
}
.lang-bar b { color: #06c755; font-weight: 500; }
.lang-bar em {
  margin-left: auto;
  font-style: normal;
  font-size: 11px;
  font-weight: 600;
  color: #06a84a;
  background: #e8f9ee;
  border-radius: 999px;
  padding: 3px 8px;
}
.thread { padding: 12px; display: grid; gap: 10px; }
.thread time {
  justify-self: center;
  background: rgba(255,255,255,.72);
  color: #667085;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
}
.msg-in, .msg-out { display: grid; gap: 0; max-width: 88%; }
.msg-out { margin-left: auto; }
.msg-in > p, .msg-out > p {
  margin: 0;
  padding: 8px 10px;
  font-size: 13px;
  line-height: 1.55;
}
.msg-in > p {
  background: #fff;
  border-radius: 4px 16px 16px 16px;
  box-shadow: 0 1px 1px rgba(16, 24, 40, .06);
}
.msg-out > p {
  background: #06c755;
  color: #fff;
  border-radius: 16px 4px 16px 16px;
}
.trans {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin-top: -1px;
  padding: 7px 10px 8px;
  background: #fff;
  border-top: 1px solid #f0f1f4;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 1px 1px rgba(16, 24, 40, .04);
}
.trans.out {
  order: -1;
  margin-top: 0;
  margin-bottom: -1px;
  border-top: 0;
  border-bottom: 1px solid #e7f6e4;
  border-radius: 12px 12px 0 0;
  background: #f7fff6;
}
.trans i {
  flex: 0 0 auto;
  font-style: normal;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .06em;
  color: #06a84a;
  background: #e8f9ee;
  border-radius: 3px;
  padding: 1px 4px;
}
.trans span { font-size: 12px; line-height: 1.5; color: #1f2937; }
.composer { background: #f0f2f5; padding-bottom: 8px; }
.preview {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  margin: 8px 10px 0;
  padding: 8px 10px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .05);
}
.preview i {
  flex: 0 0 auto;
  font-style: normal;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #06a84a;
  background: #e8f9ee;
  border-radius: 3px;
  padding: 1px 4px;
}
.preview span { font-size: 12px; line-height: 1.5; color: #111827; }
.composer-row { padding: 8px 10px 4px; gap: 8px; }
.composer-row span {
  flex: 1;
  background: #fff;
  border-radius: 18px;
  padding: 9px 12px;
  color: #9ca3af;
  font-size: 12px;
}
.composer-row b {
  background: #06c755;
  color: #fff;
  border-radius: 16px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
}

.section { padding: 36px 0; background: #fff; }
.section.alt { background: var(--bg); }
.section h2, .cta h2, .page-hero h1 { margin: 0; font-size: var(--fs-section); line-height: var(--lh-section); font-weight: 500; }
.lead, .page-hero p { margin: 8px 0 0; color: var(--muted); font-size: var(--fs-body); line-height: var(--lh-body); }
.center { text-align: left; }

.apps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px 8px;
  margin-top: 18px;
}
.app { text-align: center; }
.app i {
  width: 52px;
  height: 52px;
  margin: 0 auto 8px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}
.app i img { width: 26px; height: 26px; }
.app span { display: block; font-size: 12px; line-height: 1.3; color: #3c4458; }

.feature-list { margin-top: 16px; display: grid; gap: 10px; }
.feature-list article {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  align-items: start;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.feature-list i {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #eef2ff;
}
.feature-list i img { width: 22px; height: 22px; }
.feature-list h3, .cases h3, .flow h3, .steps article h3 { margin: 0 0 6px; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; }
.feature-list p, .cases p, .flow p, .steps article p { margin: 0; color: var(--muted); font-size: var(--fs-body); line-height: var(--lh-body); }

.stats, .cases, .flow { display: grid; gap: 10px; margin-top: 16px; }
.stats div, .cases article, .flow article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}
.stats b { display: block; font-size: 22px; letter-spacing: -.03em; color: var(--brand); }
.stats span, .cases p, .flow p { color: var(--muted); font-size: var(--fs-body); line-height: var(--lh-body); }
.cases h3, .flow h3 { margin: 0 0 6px; }
.cases p, .flow p { margin: 0; line-height: 1.6; }
.flow { counter-reset: step; }
.flow article { padding-left: 56px; position: relative; }
.flow article::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: #eef2ff;
  color: var(--brand);
  display: grid;
  place-items: center;
  font-weight: 700;
}
.who { display: flex; justify-content: space-between; gap: 8px; margin-top: 12px; font-size: 13px; }
.who b { font-weight: 600; }
.who span { color: #f5b301; letter-spacing: 1px; }
.faq h2 { margin-bottom: 12px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 16px; padding: 0; list-style: none; }
.tags li {
  border: 1px solid #d9d6ff;
  background: #fff;
  color: var(--brand);
  border-radius: 2px;
  padding: 4px 8px;
  font-size: 13px;
}

.dl-list {
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.dl-list strong { display: block; }
.dl-list span { color: var(--muted); font-size: 12px; }
.dl-list .btn { flex: 0 0 auto; padding: 8px 14px; }
.dl-grid { display: grid; gap: 10px; margin-top: 14px; }

.engines { display: grid; grid-template-columns: 1fr; gap: 8px; margin-top: 16px; }
.engine {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 10px;
}
.mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: #f8f8fb;
  border: 1px solid var(--line);
  flex: 0 0 auto;
}
.mark img { width: 22px; height: 22px; }
.engine h3 { margin: 0; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; }
.engine p { margin: 0; color: var(--muted); font-size: var(--fs-body); line-height: var(--lh-body); }

.quote {
  margin-top: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  height: 100%;
}
.quote p { margin: 0; font-size: var(--fs-body); line-height: var(--lh-body); color: #3d4558; }
.stars { margin-top: 8px; color: #f5b301; letter-spacing: 1px; font-size: 13px; }
.dots { display: none; }

.cta { padding: 8px 0 28px; text-align: left; background: #fff; }
.cta h2 span { color: var(--brand); }
.cta p { margin: 8px 0 14px; color: var(--muted); }

.site-footer {
  background: #fafafa;
  border-top: 1px solid var(--line);
  padding: 22px 0 calc(var(--bar) + 20px + env(safe-area-inset-bottom));
  color: #4b596b;
  font-size: 12px;
  line-height: 24px;
}
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 12px; }
.footer-grid > div:first-child { grid-column: 1 / -1; }
.footer-brand { font-weight: 500; color: var(--ink); font-size: 14px; line-height: 22px; display: flex; align-items: center; gap: 8px; }
.footer-brand svg { width: 24px; height: 24px; }
.site-footer h3 { margin: 0 0 8px; font-size: var(--fs-meta); line-height: 22px; font-weight: 500; color: var(--ink); }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 6px 0; }
.copy {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 12px;
}

.float-box {
  position: fixed;
  z-index: 37;
  right: 12px;
  bottom: calc(var(--bar) + 16px + env(safe-area-inset-bottom));
  width: 64px;
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.float-item {
  width: 64px;
  min-height: 64px;
  border: 0;
  border-top: 1px solid var(--line);
  background: #fff;
  color: #3c4458;
  font-size: 11px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 0;
}
.float-item:first-child { border-top: 0; }
.float-item b {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #f3f1ff;
  color: var(--brand);
  font-size: 14px;
}
.float-item img.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}
.float-item img.glyph {
  width: 20px;
  height: 20px;
  border-radius: 0;
  object-fit: contain;
}
.download-bar {
  position: fixed;
  z-index: 36;
  left: 0;
  right: 0;
  bottom: 0;
  background: #fff;
  border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}
.download-bar-inner {
  min-height: var(--bar);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.download-bar strong { display: block; font-size: 15px; }
.download-bar span { color: var(--muted); font-size: 12px; }
.download-bar .btn { flex: 0 0 auto; }

.page-hero {
  padding: 18px 0 14px;
  background: #fff;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}
.page-hero p { margin: 8px 0 0; }
.page { background: var(--bg); padding: 16px 0 calc(var(--bar) + 24px); }
.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 16px;
}
.narrow { width: min(420px, 100%); margin: 0 auto; }
.form { display: grid; gap: 12px; }
.form .btn, .panel > .btn { width: 100%; }
label { font-size: var(--fs-meta); font-weight: 500; display: grid; gap: 6px; }
input, select, textarea {
  width: 100%;
  border: 1px solid #d9dce6;
  border-radius: 4px;
  padding: 12px;
  font-size: 16px;
  outline: none;
  background: #fff;
}
textarea { min-height: 120px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--brand); }
.form-row { display: flex; justify-content: space-between; font-size: 13px; }
.form-row a, .note a, .panel a { color: var(--brand); }
.note { color: var(--muted); font-size: var(--fs-meta); line-height: 22px; }
.error { color: var(--pink); font-size: 13px; min-height: 18px; margin: 0; }

.plans, .cards-2, .help-grid, .stat-grid { display: grid; gap: 10px; }
.plan, .help-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 16px;
}
.plan.hot { border-color: var(--brand); }
.plan .tag {
  float: right;
  background: #f3f1ff;
  color: var(--brand);
  font-size: 12px;
  padding: 1px 6px;
  border-radius: 2px;
}
.plan h3, .help-card h3 { margin: 0; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; }
.price { font-size: 28px; font-weight: 700; margin-top: 8px; }
.price span { font-size: 13px; font-weight: 500; color: var(--muted); }
.plan ul { margin: 8px 0 14px; padding-left: 18px; color: #4c5568; }
.plan .btn { width: 100%; }
.stat { background: #f6f5ff; border-radius: 4px; padding: 12px; font-size: 13px; color: var(--muted); }
.stat b { display: block; margin-top: 4px; font-size: 18px; color: var(--brand); overflow-wrap: anywhere; }
.table { width: 100%; border-collapse: collapse; font-size: var(--fs-meta); line-height: 22px; min-width: 460px; }
.table th, .table td { text-align: left; padding: 10px 6px; border-bottom: 1px solid var(--line); }
.panel:has(.table) { overflow-x: auto; }
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 12px 14px;
  margin-bottom: 8px;
}
.faq summary { cursor: pointer; font-weight: 700; }
.faq summary { font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; }
.faq p { margin: 8px 0 0; color: #4c5568; font-size: var(--fs-body); line-height: var(--lh-body); }
.help-card p { margin-bottom: 0; color: var(--muted); font-size: var(--fs-body); line-height: var(--lh-body); }
.steps { display: grid; gap: 8px; }
.steps article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 14px 14px 14px 52px;
  position: relative;
}
.steps article h3 { margin: 0 0 6px; }
.steps article p { margin: 0; }
.steps article::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 26px;
  height: 26px;
  border-radius: 4px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
}
.steps { counter-reset: step; }

.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(18, 16, 40, .45);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .25s ease, visibility .25s ease;
}
.modal.show { opacity: 1; visibility: visible; pointer-events: auto; }
.modal-card {
  width: min(420px, 100%);
  background: #fff;
  border-radius: 8px 8px 0 0;
  transform: translateY(28px);
  transition: transform .28s ease;
}
.modal.show .modal-card { transform: none; }
.modal-card header {
  padding: 14px 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--line);
}
.modal-card .body { padding: 14px 16px 4px; color: #3c4456; font-size: 14px; }
.modal-card footer { padding: 8px 16px 16px; }
.modal-card footer .btn { width: 100%; }
.chat-panel {
  position: fixed;
  z-index: 50;
  right: 84px;
  bottom: calc(var(--bar) + 16px + env(safe-area-inset-bottom));
  width: min(320px, calc(100% - 108px));
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(16px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
}
.chat-panel.show { opacity: 1; visibility: visible; pointer-events: auto; transform: none; }
.chat-panel header {
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
}
.chat-panel header img { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; }
.chat-panel header button { margin-left: auto; }
.chat-log { height: 240px; overflow: auto; padding: 12px; background: var(--bg); display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: 86%; padding: 8px 10px; border-radius: 4px; font-size: 13px; background: #fff; border: 1px solid var(--line); }
.msg.me { align-self: flex-end; background: #f3f1ff; border-color: #e3defa; }
.chat-form { display: flex; gap: 8px; padding: 10px; }
.chat-form input { flex: 1; }
.chat-form .btn { flex: 0 0 auto; }
.toast {
  position: fixed;
  left: 50%;
  top: 64px;
  transform: translateX(-50%);
  width: min(440px, calc(100% - 32px));
  background: #1d2433;
  color: #fff;
  padding: 10px 14px;
  border-radius: 4px;
  z-index: 70;
  display: none;
  text-align: center;
}
.toast.show { display: block; }

@media (min-width: 720px) {
  .engines, .plans, .cards-2, .help-grid, .stat-grid, .dl-grid, .feature-list, .cases, .flow { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(4, 1fr); }
  .btn-block { width: auto; min-width: 200px; }
  .modal { align-items: center; padding: 24px; }
  .modal-card { border-radius: 8px; }
}
@media (min-width: 1080px) {
  .container,
  .header-bar,
  .download-bar-inner,
  .copy {
    width: min(var(--page), calc(100% - 200px));
    margin-left: auto;
    margin-right: auto;
  }
  .menu-toggle { display: none; }
  .nav-drawer,
  .nav-drawer.is-on,
  .nav-drawer.is-leaving,
  body.nav-open .nav-drawer {
    display: flex;
    position: static;
    animation: none;
    flex: 1;
    min-width: 0;
    flex-direction: row;
    align-items: center;
    background: transparent;
    top: auto;
    right: auto;
    bottom: auto;
    left: auto;
  }
  .nav-drawer nav { display: flex; align-items: center; justify-content: flex-end; flex: 1; min-width: 0; overflow: visible; gap: 4px; }
  .nav-label { display: none; }
  .nav-item {
    border: 0;
    min-height: 64px;
    padding: 0 14px;
    font-size: 14px;
    font-weight: 400;
    color: #3a4356;
    white-space: nowrap;
    background: transparent;
  }
  .nav-item:hover { color: #3b6cff; }
  .nav-item.active { background: transparent; color: #3b6cff; font-weight: 500; }
  .nav-account {
    display: flex;
    align-items: center;
    flex: 0 0 auto;
    margin-left: 12px;
    border: 0;
    padding: 0;
    gap: 8px;
    background: transparent;
  }
  .nav-account .signup-tip { display: none; }
  .nav-account .btn { width: auto; }
  .nav-login {
    min-height: 36px;
    padding: 0 8px;
    border: 0;
    background: transparent;
    color: #3a4356;
  }
  .nav-signup { min-height: 34px; padding: 0 16px; border-radius: 999px; }
  .header-bar { gap: 8px; }
  .hero { padding: 64px 0 48px; }
  .hero h1 { font-size: 48px; }
  .hero-copy .btn { width: auto; min-width: 148px; }
  .apps { grid-template-columns: repeat(8, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr repeat(4, 1fr); gap: 24px; }
  .footer-grid > div:first-child { grid-column: auto; }
  .engines, .help-grid { grid-template-columns: repeat(3, 1fr); }
  .flow { grid-template-columns: repeat(4, 1fr); }
  .plans { grid-template-columns: repeat(4, 1fr); }
  .stat-grid { grid-template-columns: repeat(3, 1fr); }
  .section .container:has(> .quote) {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    align-items: stretch;
  }
  .section .container:has(> .quote) > h2,
  .section .container:has(> .quote) > .lead { grid-column: 1 / -1; margin-bottom: 4px; }
  .quote { margin-top: 0; }
  .float-box { right: 20px; }
}

.pi { background: #f7f8fc; }
.pi-note {
  background: #eef3ff;
  color: #3d4d73;
  font-size: var(--fs-meta);
  line-height: 21px;
  text-align: center;
  padding: 8px 0;
}
.pi-hero {
  background:
    radial-gradient(520px 280px at 78% 42%, rgba(186, 176, 255, .45), transparent 70%),
    linear-gradient(180deg, #f4f7ff 0%, #f7f5ff 55%, #f7f8fc 100%);
  padding: 36px 0 12px;
}
.pi-hero-grid { display: grid; gap: 8px; align-items: center; }
.pi-copy h1,
.pi-slogan {
  margin: 0;
  font-size: var(--fs-hero);
  line-height: var(--lh-hero);
  font-weight: 600;
  letter-spacing: 0;
}
.pi-copy h1 { color: #3b6cff; }
.pi-slogan { margin-top: 0; color: #1d2331; }
.pi-copy p:last-of-type {
  margin: 16px 0 0;
  max-width: 520px;
  color: #1d2331;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
}
.pi-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 18px;
  border: 0;
  border-radius: 999px;
  background: #3b6cff;
  color: #fff;
  padding: 11px 26px;
  font-size: var(--fs-btn);
  font-weight: 500;
  cursor: pointer;
}
.pi-btn.ghost { background: #fff; color: #3b6cff; box-shadow: inset 0 0 0 1px #c9d7ff; }
.pi-visual { display: flex; justify-content: center; padding: 8px 0 4px; }
.orbit {
  position: relative;
  width: min(420px, 100%);
  aspect-ratio: 1;
}
.orbit-glow,
.orbit-ring {
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
.orbit-glow {
  width: 88%;
  height: 88%;
  background: radial-gradient(circle at 50% 50%, #fff 0%, #ece8ff 34%, #d7e4ff 62%, rgba(255,255,255,0) 74%);
}
.orbit-ring {
  border: 1.5px dashed rgba(129, 146, 196, .55);
}
.orbit-ring.r1 { width: 78%; height: 78%; }
.orbit-ring.r2 { width: 52%; height: 52%; }
.person { position: absolute; margin: 0; width: 74px; }
.person img {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #fff;
  box-shadow: 0 10px 22px rgba(70, 90, 150, .18);
}
.bubble {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  background: #fff;
  color: #1c2434;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.2;
  padding: 6px 10px;
  border-radius: 12px;
  white-space: nowrap;
  box-shadow: 0 8px 18px rgba(40, 60, 120, .12);
}
.person.p1 { left: 54%; top: 14%; }
.person.p2 { left: 68%; top: 42%; }
.person.p2 .bubble { left: auto; right: calc(100% + 8px); bottom: 18px; transform: none; }
.person.p3 { left: 12%; top: 56%; }
.person.p4 { left: 48%; top: 70%; }
.pi-caps { padding: 18px 0 10px; }
.cap-grid { display: grid; gap: 16px; }
.cap-grid article {
  background: linear-gradient(180deg, #fbfcff 0%, #f4f7ff 72%, #eef3fb 100%);
  border-radius: 18px;
  padding: 22px 20px 20px;
  box-shadow: 0 10px 28px rgba(88, 112, 168, .08);
}
.cap-title { display: flex; align-items: center; gap: 8px; }
.cap-title svg { width: 28px; height: 28px; flex: 0 0 auto; }
.cap-grid h3 { margin: 0; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; color: #1c212a; }
.cap-grid p { margin: 12px 0 0; color: #1d2331; font-size: var(--fs-body); line-height: var(--lh-body); }
.pi-block { padding: 36px 0 8px; }
.pi-block h2 {
  margin: 0;
  text-align: center;
  font-size: var(--fs-section);
  line-height: var(--lh-section);
  font-weight: 500;
  letter-spacing: 0;
  color: #1c212a;
}
.pi-lead {
  margin: 8px auto 0;
  max-width: 640px;
  text-align: center;
  color: rgba(30, 35, 48, .8);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
}
.pi .apps { margin-top: 22px; }
.shot-row {
  display: flex;
  gap: 14px;
  margin-top: 28px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 8px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.shot-row::-webkit-scrollbar { display: none; }
.shot { margin: 0; flex: 0 0 72%; scroll-snap-align: center; text-align: center; }
.shot img {
  width: 100%;
  height: auto;
  aspect-ratio: 819 / 1725;
  object-fit: contain;
  object-position: center;
  border-radius: 28px;
  box-shadow: 0 18px 40px rgba(28, 39, 68, .14);
}
.shot figcaption { margin-top: 10px; font-size: var(--fs-meta); font-weight: 500; color: #1c212a; }
.scene-grid { display: grid; gap: 16px; margin-top: 22px; }
.scene {
  background: #fff;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(28, 39, 68, .06);
}
.scene img { width: 100%; height: 168px; object-fit: cover; }
.scene h3 { margin: 14px 16px 6px; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; color: #1c212a; }
.scene p { margin: 0 16px 18px; color: rgba(30, 35, 48, .8); font-size: var(--fs-body); line-height: var(--lh-body); }
.pi .engines { margin-top: 22px; }
.pi .engine {
  background: #fff;
  border: 0;
  border-radius: 16px;
  box-shadow: 0 10px 28px rgba(40, 70, 140, .06);
  padding: 16px;
}
.pi-service { padding-bottom: 28px; }
.svc-grid { display: grid; gap: 16px; margin-top: 22px; }
.svc-grid article {
  background: #fff;
  border-radius: 16px;
  padding: 22px 20px 20px;
  box-shadow: 0 10px 28px rgba(40, 70, 140, .06);
}
.svc-grid h3 { margin: 0 0 8px; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; color: #1c212a; }
.svc-grid p { margin: 0; color: rgba(30, 35, 48, .8); font-size: var(--fs-body); line-height: var(--lh-body); }
.svc-grid a { color: #3b6cff; }
.pi-contact {
  margin-top: 18px;
  background: #fff;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 10px 28px rgba(40, 70, 140, .06);
}
.pi-contact h3 { margin: 0 0 6px; font-size: var(--fs-title); line-height: var(--lh-title); font-weight: 500; }
.pi-contact p { margin: 0; color: rgba(30, 35, 48, .8); font-size: var(--fs-body); line-height: var(--lh-body); }
.pi-contact p + p { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px 14px; }
.pi-contact a { color: #3b6cff; font-weight: 600; }

@media (max-width: 1079px) {
  .container,
  .header-bar,
  .download-bar-inner,
  .copy {
    width: calc(100% - 32px);
    margin-left: auto;
    margin-right: auto;
  }
  .float-box { right: 8px; width: 52px; }
  .float-item { width: 52px; min-height: 52px; }
}
@media (max-width: 719px) {
  :root { --fs-hero: 28px; --lh-hero: 40px; }
  .pi-hero { padding: 24px 0 8px; }
  .pi-copy p:last-of-type { max-width: none; }
  .orbit {
    width: min(100%, 340px);
    margin: 12px auto 28px;
  }
  .person { width: 58px; }
  .person img { width: 56px; height: 56px; }
  .bubble { font-size: 13px; padding: 4px 8px; }
  .person.p1 { left: 48%; top: 10%; }
  .person.p2 { left: 64%; top: 40%; }
  .person.p2 .bubble { right: calc(100% + 6px); bottom: 12px; }
  .person.p3 { left: 6%; top: 46%; }
  .person.p4 { left: 42%; top: 68%; }
}
@media (min-width: 720px) {
  :root {
    --fs-hero: 40px;
    --lh-hero: 60px;
    --fs-section: 32px;
    --lh-section: 48px;
    --fs-title: 20px;
    --lh-title: 30px;
    --fs-body: 16px;
    --lh-body: 28px;
    --fs-btn: 16px;
  }
  .cap-grid, .svc-grid, .scene-grid { grid-template-columns: 1fr 1fr; }
  .shot { flex-basis: 31%; }
  .pi-hero { padding: 56px 0 20px; }
}
@media (min-width: 1080px) {
  :root {
    --fs-hero: 56px;
    --lh-hero: 84px;
    --fs-section: 44px;
    --lh-section: 66px;
    --fs-title: 24px;
    --lh-title: 36px;
    --fs-body: 16px;
    --lh-body: 28px;
    --fs-btn: 18px;
    --fs-nav: 14px;
    --fs-meta: 14px;
    --fs-small: 12px;
  }
  .pi-hero-grid { grid-template-columns: 1.05fr .95fr; gap: 48px; }
  .cap-grid { grid-template-columns: repeat(4, 1fr); }
  .shot-row { display: grid; grid-template-columns: repeat(5, 1fr); overflow: visible; }
  .shot { flex: none; }
  .scene-grid, .svc-grid, .pi .engines { grid-template-columns: repeat(3, 1fr); }
}

.reveal:not(.in):not(.out) { opacity: 0; transform: translateY(28px); }
.reveal.in { animation: rise-in .6s ease both; animation-delay: var(--d, 0ms); }
.reveal.out { animation: rise-out .4s ease both; }
@keyframes rise-in {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: none; }
}
@keyframes rise-out {
  from { opacity: 1; transform: none; }
  to { opacity: 0; transform: translateY(-16px); }
}
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal.in, .reveal.out { opacity: 1; transform: none; animation: none; }
  .nav-drawer.is-on, .nav-drawer.is-leaving, .modal, .modal-card, .chat-panel { animation: none; transition: none; }
}