/* ───────── tokens ───────── */
:root {
  --bg: #f5f7fb;
  --bg-2: #ffffff;
  --ink: #0b101a;
  --muted: #5a6170;
  --faint: #9aa1ae;
  --line: #e3e8f0;
  --blue: #0071e3;
  --blue-2: #257fda;
  --blue-soft: #eaf3ff;
  --paper: #fffdf8;
  --shadow: 0 1px 2px rgb(11 30 70 / 0.05), 0 14px 34px -10px rgb(11 30 70 / 0.18), 0 44px 90px -30px rgb(11 30 70 / 0.18);
  --radius: 28px;
  --sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Hiragino Sans GB', 'Noto Sans SC', 'Microsoft YaHei', system-ui, sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --max: 1160px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07090d;
    --bg-2: #10141b;
    --ink: #eef2f8;
    --muted: #9aa3b2;
    --faint: #5f6775;
    --line: #1e2430;
    --blue: #3b9bff;
    --blue-2: #64b0ff;
    --blue-soft: #0e2238;
    --paper: #151a22;
    --shadow: 0 0 0 1px rgb(255 255 255 / 0.06), 0 30px 70px -24px rgb(0 0 0 / 0.75);
    color-scheme: dark;
  }
}

/* ───────── base ───────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; }
button { font: inherit; color: inherit; }
::selection { background: var(--blue-soft); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 6px; }
[hidden] { display: none !important; }
html[data-lang='zh'] .en, html[data-lang='en'] .zh { display: none !important; }

h1, h2, h3 { margin: 0; letter-spacing: -0.02em; line-height: 1.12; font-weight: 800; }
h1 em, h2 em { font-style: normal; color: var(--blue); }
html[data-lang='zh'] h1, html[data-lang='zh'] h2 { letter-spacing: 0; }
p { margin: 0; }
.mono { font-family: var(--mono); }

.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
html[data-lang='zh'] .eyebrow { letter-spacing: 0.12em; }
.sub { color: var(--muted); font-size: 18px; margin-top: 18px; max-width: 36em; }
.fine { font-size: 13px; color: var(--faint); margin-top: 18px; }
.pill {
  display: inline-block;
  vertical-align: middle;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgb(255 255 255 / 0.2);
  color: #fff;
  margin-left: 4px;
}

/* ───────── buttons ───────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: 99px;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background-color 0.2s;
}
.btn:active { transform: scale(0.97); }
.btn-sm { height: 36px; padding: 0 16px; font-size: 14px; }
.btn-blue { background: var(--blue); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--line); }
.btn-ghost:hover { background: var(--bg-2); }

.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 56px;
  padding: 0 22px 0 18px;
  border-radius: 14px;
  background: #000;
  color: #fff;
  text-decoration: none;
  transition: transform 0.2s var(--ease);
}
@media (prefers-color-scheme: dark) { .store-badge { background: #fff; color: #000; } }
.store-badge svg { width: 26px; height: 26px; }
.store-badge .badge-text { display: flex; flex-direction: column; line-height: 1.1; }
.store-badge small { font-size: 11px; opacity: 0.85; }
.store-badge strong { font-size: 21px; font-weight: 600; letter-spacing: -0.01em; }
.store-badge[aria-disabled='true'] { cursor: default; }
.store-badge:not([aria-disabled='true']):active { transform: scale(0.97); }

/* ───────── nav ───────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
  padding: 0 max(20px, calc((100vw - var(--max)) / 2));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: saturate(1.6) blur(18px);
  backdrop-filter: saturate(1.6) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; text-decoration: none; }
.brand img { border-radius: 8px; box-shadow: 0 0 0 1px var(--line); }
.nav-links { display: flex; gap: 26px; margin-left: 12px; }
.nav-links a { text-decoration: none; font-size: 14px; color: var(--muted); transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-end { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang {
  height: 36px;
  min-width: 52px;
  padding: 0 12px;
  border-radius: 99px;
  border: 0;
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--line);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.lang:hover { background: var(--bg-2); }

/* ───────── layout ───────── */
main { overflow: clip; }
.section { max-width: var(--max); margin: 0 auto; padding: 120px 20px 0; }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head.center .sub { margin-left: auto; margin-right: auto; }
h2 { font-size: clamp(34px, 5vw, 56px); }

/* ───────── hero ───────── */
.hero {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 64px 20px 40px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero::before {
  content: '';
  position: absolute;
  inset: -240px -40vw auto 35%;
  height: 980px;
  background:
    radial-gradient(closest-side at 40% 45%, color-mix(in srgb, var(--blue) 16%, transparent), transparent 70%),
    radial-gradient(closest-side at 70% 70%, color-mix(in srgb, #7fc3ff 18%, transparent), transparent 70%);
  z-index: -1;
  pointer-events: none;
}
h1 { font-size: clamp(44px, 6.6vw, 80px); }
html[data-lang='zh'] h1 { font-size: clamp(44px, 6.4vw, 76px); line-height: 1.14; }
.lede { font-size: 19px; color: var(--muted); margin-top: 24px; max-width: 30em; }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 36px; }

.hero-stage { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 22px; }
.proof {
  width: min(100%, 420px);
  padding: 14px 14px 10px;
  background: var(--paper);
  border-radius: 6px;
  box-shadow: var(--shadow);
  transform: rotate(-1.6deg);
  transition: transform 0.6s var(--ease);
}
.proof:hover { transform: rotate(-0.6deg); }
.proof-photo {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: 2px;
  background: #222;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  touch-action: manipulation;
}
.proof-photo img, .proof-photo video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}
.proof-photo video { opacity: 0; transition: opacity 0.18s; }
.proof-photo.playing video { opacity: 1; }
.proof-photo.playing { animation: live-press 0.5s var(--ease) both; }
@keyframes live-press { 0% { transform: scale(1); } 40% { transform: scale(1.025); } 100% { transform: scale(1.01); } }

.live-badge {
  position: absolute;
  left: 12px;
  top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px 3px 6px;
  border-radius: 99px;
  font: 600 12px/1.4 var(--sans);
  letter-spacing: 0.04em;
  color: #fff;
  background: rgb(0 0 0 / 0.32);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.live-badge svg { width: 16px; height: 16px; }
.proof-photo.playing .live-badge { background: rgb(255 255 255 / 0.9); color: #111; }

.hold {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 104px;
  height: 104px;
  margin: -52px 0 0 -52px;
  display: grid;
  place-items: center;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.4s var(--ease);
}
.hold-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid rgb(255 255 255 / 0.9);
  box-shadow: 0 0 0 1px rgb(0 0 0 / 0.08), inset 0 0 0 1px rgb(0 0 0 / 0.06);
  animation: hold-pulse 2.4s var(--ease) infinite;
}
.hold-ring::after {
  content: '';
  position: absolute;
  inset: 26px;
  border-radius: 50%;
  background: rgb(255 255 255 / 0.35);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border: 2px solid #fff;
}
.hold-text {
  position: absolute;
  top: calc(100% + 10px);
  white-space: nowrap;
  font-weight: 700;
  font-size: 15px;
  color: #fff;
  text-shadow: 0 1px 10px rgb(0 0 0 / 0.5);
}
@keyframes hold-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.12); opacity: 0.7; }
}
.proof-photo.playing .hold, .proof-photo.touched .hold { opacity: 0; transform: scale(0.8); }

.proof-meta {
  display: flex;
  justify-content: space-between;
  padding: 9px 2px 0;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--faint);
}

.fx-picker {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: 460px;
}
.fx-chip {
  height: 32px;
  padding: 0 12px;
  border-radius: 99px;
  border: 0;
  background: var(--bg-2);
  box-shadow: inset 0 0 0 1px var(--line);
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, transform 0.2s var(--ease);
}
.fx-chip:hover { color: var(--ink); }
.fx-chip:active { transform: scale(0.95); }
.fx-chip[aria-checked='true'] { background: var(--blue); color: #fff; box-shadow: none; }

/* ───────── effects grid ───────── */
.fx-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px 20px; max-width: 980px; }
.fx-tile { margin: 0; }
.fx-media {
  position: relative;
  aspect-ratio: 3 / 4;
  border-radius: 18px;
  overflow: hidden;
  background: #1b1d22;
  box-shadow: var(--shadow);
}
.fx-media img, .fx-media video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.fx-media video { opacity: 0; transition: opacity 0.3s; }
.fx-media.ready video { opacity: 1; }
.fx-num {
  position: absolute;
  left: 10px;
  top: 10px;
  padding: 2px 8px;
  border-radius: 6px;
  font: 600 11px/1.6 var(--mono);
  color: #fff;
  background: rgb(0 0 0 / 0.38);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}
.fx-tile figcaption { padding: 14px 4px 0; }
.fx-tile h3 { font-size: 18px; display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.fx-tile h3 small { font: 600 11px var(--mono); letter-spacing: 0.08em; color: var(--faint); }
.fx-tile p { color: var(--muted); font-size: 14.5px; line-height: 1.55; margin-top: 6px; }

/* ───────── steps ───────── */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.steps li { display: flex; flex-direction: column; align-items: center; text-align: center; }
.phone-shot {
  width: 100%;
  max-width: 260px;
  filter: drop-shadow(0 24px 36px rgb(11 30 70 / 0.16)) drop-shadow(0 4px 10px rgb(11 30 70 / 0.08));
}
@media (prefers-color-scheme: dark) { .phone-shot { filter: drop-shadow(0 24px 48px rgb(0 0 0 / 0.6)); } }
.step-n { font: 600 13px var(--mono); color: var(--blue); margin-top: 28px; }
.steps h3 { font-size: 21px; margin-top: 6px; }
.steps p { color: var(--muted); font-size: 15.5px; margin-top: 8px; max-width: 20em; }

/* ───────── formats ───────── */
.formats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.format {
  padding: 26px 24px 28px;
  border-radius: 22px;
  background: var(--bg-2);
  box-shadow: inset 0 0 0 1px var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.format h3 { font-size: 21px; }
.format p { color: var(--muted); font-size: 15px; }
.format-tag {
  align-self: flex-start;
  font: 700 11px/1 var(--sans);
  letter-spacing: 0.06em;
  padding: 5px 9px;
  border-radius: 99px;
  background: var(--line);
  color: var(--muted);
}
.format-tag.plus { background: var(--blue-soft); color: var(--blue); }
.format-live { background: linear-gradient(160deg, #1f8bff, #0062d6); color: #fff; box-shadow: 0 24px 50px -24px rgb(0 113 227 / 0.6); }
.format-live p { color: rgb(255 255 255 / 0.85); }
.format-live .format-tag.plus { background: rgb(255 255 255 / 0.2); color: #fff; }

/* ───────── privacy ───────── */
.privacy-inner {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
  align-items: center;
  padding: 64px 56px;
  border-radius: 40px;
  background: var(--bg-2);
  box-shadow: inset 0 0 0 1px var(--line);
}
.privacy-inner .phone-shot { justify-self: center; max-width: 250px; }
.privacy-list { list-style: none; margin: 32px 0 0; padding: 0; }
.privacy-list li { display: grid; gap: 6px; padding: 22px 0; border-top: 1px solid var(--line); }
.privacy-list strong { font-size: 19px; }
.privacy-list li > span { color: var(--muted); font-size: 16px; }

/* ───────── pricing ───────── */
.ticks { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
.ticks li { position: relative; padding-left: 30px; font-size: 16px; }
.ticks li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.32em;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--blue-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.4l2.6 2.5L13 6.4' fill='none' stroke='%230071e3' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px no-repeat;
}
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 400px)); justify-content: center; gap: 24px; }
.plan { padding: 36px 32px; border-radius: var(--radius); background: var(--bg-2); box-shadow: inset 0 0 0 1px var(--line); }
.plan h3 { font-size: 22px; }
.plan-price { font-size: 30px; font-weight: 800; margin-top: 10px; letter-spacing: -0.02em; line-height: 1.25; }
.plan-plus { background: linear-gradient(160deg, #2a93ff, #0071e3 55%, #0055b3); color: #fff; box-shadow: 0 30px 60px -24px rgb(0 113 227 / 0.55); }
.plan-plus .ticks li::before {
  background-color: rgb(255 255 255 / 0.2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.4l2.6 2.5L13 6.4' fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
.plan-note { font-size: 13px; opacity: 0.8; margin-top: 22px; }

/* ───────── faq ───────── */
.faq { max-width: 860px; }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 1px solid var(--line); }
.faq-list summary { list-style: none; cursor: pointer; padding: 22px 40px 22px 0; font-size: 18px; font-weight: 600; position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: '';
  position: absolute;
  right: 6px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -9px;
  border-right: 2px solid var(--faint);
  border-bottom: 2px solid var(--faint);
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
}
.faq-list details[open] summary::after { transform: rotate(-135deg); margin-top: -3px; }
.faq-list details p { color: var(--muted); padding: 0 40px 24px 0; }

/* ───────── final + footer ───────── */
.final { text-align: center; padding: 140px 20px 120px; display: flex; flex-direction: column; align-items: center; gap: 28px; }
.final img { border-radius: 22px; box-shadow: var(--shadow); }
.footer { border-top: 1px solid var(--line); }
.footer-inner { max-width: var(--max); margin: 0 auto; padding: 28px 20px 40px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; font-size: 14px; color: var(--muted); }
.footer nav { display: flex; flex-wrap: wrap; gap: 20px; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--ink); }
.footer p a { text-decoration: underline; text-underline-offset: 3px; }

/* ───────── reveal ───────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ───────── responsive ───────── */
@media (max-width: 1000px) {
  .formats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  body { font-size: 16px; }
  .nav { gap: 12px; }
  .nav-links { display: none; }
  .hero { grid-template-columns: 1fr; gap: 44px; padding-top: 32px; }
  .hero-stage { order: -1; }
  .proof { width: min(78vw, 360px); }
  .section { padding-top: 88px; }
  .section-head { margin-bottom: 40px; }
  .fx-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .fx-tile p { display: none; }
  .fx-tile h3 { font-size: 15px; }
  .steps { grid-template-columns: 1fr; gap: 64px; }
  .privacy-inner { grid-template-columns: 1fr; padding: 44px 24px; border-radius: 28px; gap: 40px; }
  .privacy-inner .phone-shot { order: 2; max-width: 220px; }
  .plans { grid-template-columns: 1fr; }
  .faq-list summary { font-size: 17px; }
  .sub, .lede { font-size: 17px; }
}
@media (max-width: 520px) {
  .formats { grid-template-columns: 1fr; }
  .cta-row .btn-ghost { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hold-ring { animation: none; }
  * { transition-duration: 0.01ms !important; }
}