:root {
  --bg: #07070f;
  --panel: #12121c;
  --ink: #f4f5fb;
  --muted: #8b90a7;
  --line: rgba(255, 255, 255, 0.08);
  --brand: #5b8cff;
  --glow: rgba(91, 140, 255, 0.32);
  --font: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --wrap: min(1120px, calc(100% - 48px));
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background:
    radial-gradient(920px 520px at 8% -12%, rgba(78, 62, 196, 0.26), transparent 58%),
    radial-gradient(720px 380px at 96% 4%, rgba(42, 84, 210, 0.18), transparent 52%),
    var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16px;
}
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 40; background: #fff; color: #111; padding: 8px 12px; }
.wrap { width: var(--wrap); margin-inline: auto; }

.top {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 28px;
  padding: 0 5vw; min-height: 68px;
  background: rgba(7, 7, 15, 0.78);
  backdrop-filter: blur(22px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; margin-right: auto; letter-spacing: 0.01em;
}
.brand-mark {
  width: 28px; height: 28px; border-radius: 8px;
  object-fit: cover;
}
.brand b {
  width: 28px; height: 28px; border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(180deg, #7aa0ff, #4d74f0);
  font-size: 0.68rem; color: #fff;
}
.top nav { display: flex; gap: 26px; color: var(--muted); font-size: 0.9rem; font-weight: 500; }
.top nav a:hover, .top nav a[aria-current="page"] { color: #fff; }
.pill, .ghost {
  min-height: 42px; padding: 0 18px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600; cursor: pointer; border: 0;
  transition: transform 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
}
.pill { background: linear-gradient(180deg, #7aa3ff, #4e78f5); color: #fff; box-shadow: 0 10px 26px var(--glow); }
.pill:hover { transform: translateY(-1px); }
.ghost {
  background: transparent; color: #fff;
  border: 1px solid rgba(255,255,255,.14);
}
.ghost:hover { border-color: rgba(255,255,255,.38); }
.lang {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.lang:hover { color: #fff; border-color: rgba(255,255,255,.32); }
.menu-btn { display: none; background: none; border: 0; color: #fff; font-size: 1.3rem; min-width: 44px; min-height: 44px; }

.hero { padding: 64px 0 8px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 56px;
  align-items: center;
}
.hero-left {
  display: flex;
  flex-direction: column;
}
.hero-copy { padding-top: 0; }
.metrics {
  display: flex; gap: 0; max-width: 34rem;
  margin-top: 40px;
}
.tag {
  color: #b7c5f5; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.06em; margin: 0;
}
h1 {
  font-size: clamp(2.6rem, 5.6vw, 4.35rem);
  line-height: 1.06; margin: 16px 0 18px; letter-spacing: -0.05em; font-weight: 700;
}
.lead { color: var(--muted); max-width: 36rem; font-size: 1.02rem; margin: 0; }
.hero .row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.metrics div {
  flex: 1; padding-right: 22px; margin-right: 22px;
  border-right: 1px solid var(--line);
}
.metrics div:last-child { border: 0; margin: 0; padding: 0; }
.metrics b {
  display: block; font-size: 1.7rem; color: #dbe3ff; letter-spacing: -0.04em; font-weight: 700;
}
.metrics span { color: var(--muted); font-size: 0.8rem; }

.hero-stage { position: relative; min-height: 560px; }
.stage-dash, .stage-poster {
  position: absolute;
  border-radius: 22px;
  box-shadow: 0 36px 70px rgba(0,0,0,.5);
}
.stage-dash {
  width: 78%;
  top: 10%;
  left: 0;
  border: 1px solid rgba(255,255,255,.1);
  transform: rotate(-5.5deg);
  overflow: hidden;
  background: #efeef6;
}
.stage-dash img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  object-position: left top;
}
.stage-poster {
  width: min(268px, 46%);
  right: 2%;
  top: 16%;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.12);
  transform: rotate(6.5deg);
  z-index: 2;
}
.stage-poster img {
  width: 100%;
  height: 448px;
  object-fit: cover;
  object-position: center 26%;
  cursor: zoom-in;
}

.block { padding: 96px 0; scroll-margin-top: 76px; }
.kicker {
  color: var(--muted); font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.14em; margin: 0 0 10px;
}
.block h2, .wrap > h2 {
  font-size: clamp(1.65rem, 2.8vw, 2.25rem);
  margin: 0 0 12px; letter-spacing: -0.038em; font-weight: 700;
}
.say { font-size: 1.05rem; color: var(--muted); max-width: 42rem; margin: 0; }

.panel {
  margin-top: 40px;
  background: linear-gradient(180deg, #161622, #101018);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 40px;
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 40px;
  align-items: center;
}
.checks { display: grid; gap: 26px; }
.check h3 { margin: 0 0 6px; font-size: 1.02rem; font-weight: 650; }
.check p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.check h3::before {
  content: "";
  display: inline-block;
  width: 16px; height: 16px; margin-right: 10px; vertical-align: -2px;
  background:
    linear-gradient(#6f93ff, #6f93ff) center / 8px 8px no-repeat,
    radial-gradient(circle, rgba(111,147,255,.2) 55%, transparent 56%);
  border-radius: 50%;
}
.window {
  margin: 0;
  border-radius: 16px;
  overflow: hidden;
  background: #f4f2f8;
  border: 1px solid rgba(255,255,255,.06);
  box-shadow: 0 22px 48px rgba(0,0,0,.32);
}
.winbar {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 14px; background: #eceaf2; color: #6b6680; font-size: 0.74rem;
}
.winbar i { width: 8px; height: 8px; border-radius: 50%; background: #c9c3d8; }
.window img {
  width: 100%; height: 340px; object-fit: cover; object-position: left top; cursor: zoom-in;
}

.shot-band {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 32px;
  align-items: center;
  padding: 28px 32px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(16, 16, 24, 0.55);
}
.shot-band h3 { margin: 0 0 8px; font-size: 1.15rem; }
.shot-band p { margin: 0 0 16px; color: var(--muted); }
.shot-band .more { margin: 0; }
.shot-band .window img { height: 220px; }

.subhead {
  margin: 48px 0 10px;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}
.shot-grid,
.demo-grid,
.chat-grid {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}
.shot-grid { grid-template-columns: 1fr 1fr; }
.demo-grid { grid-template-columns: 1fr 1fr; }
.chat-grid { grid-template-columns: repeat(3, 1fr); align-items: start; }
.shot-grid figure,
.demo-grid figure,
.chat-grid figure {
  margin: 0;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #12121c;
}
.shot-grid img,
.chat-grid img {
  width: 100%;
  height: auto;
  display: block;
  cursor: zoom-in;
}
.shot-grid figcaption,
.demo-grid figcaption,
.chat-grid figcaption {
  margin: 0;
  padding: 12px 16px 14px;
  color: var(--muted);
  font-size: 0.82rem;
}
.video-card .winbar { background: #1a1a26; color: #8b90a7; }
.video-card video {
  width: auto;
  max-width: 100%;
  max-height: 560px;
  margin: 0 auto;
  display: block;
  background: #000;
}

.poster-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 36px;
}
.poster-strip figure { margin: 0; }
.poster-frame {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #101018;
  aspect-ratio: 9 / 16;
}
.poster-strip img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center; cursor: zoom-in;
  transition: transform 420ms var(--ease);
}
.poster-strip figure:hover img { transform: scale(1.035); }
.poster-strip figcaption {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  text-align: center;
}

.feats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 36px;
}
.feat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px 24px 26px;
}
.feat b {
  display: block; color: #9bb4ff; font-size: 0.78rem; letter-spacing: 0.08em; margin-bottom: 10px;
}
.feat h3 { margin: 0 0 8px; font-size: 1.05rem; }
.feat p { margin: 0; color: var(--muted); font-size: 0.94rem; }

.flow { display: grid; gap: 0; margin-top: 20px; }
.flow article {
  display: grid; grid-template-columns: 56px 1fr; gap: 8px;
  padding: 20px 0; border-bottom: 1px solid var(--line);
}
.flow b { color: #9bb4ff; font-size: 0.95rem; letter-spacing: 0.04em; padding-top: 2px; }
.flow h3 { margin: 0 0 4px; font-size: 1.02rem; }
.flow p { margin: 0; color: var(--muted); }

.more { margin-top: 20px; color: var(--muted); }
.more a { color: #c5d4ff; border-bottom: 1px solid rgba(197,212,255,.35); }
.feat a { color: #c5d4ff; }
.check a { color: #c5d4ff; }
.feat h3 a { color: inherit; text-decoration: none; border-bottom: 1px solid currentColor; }
.feat h3 a:hover { color: #9bb4ff; }
table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); }
th { color: #9bb4ff; font-size: 0.82rem; }
tr:last-child td { border-bottom: 0; }
table a { color: #c5d4ff; }

.quotes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 36px; }
.quote-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 24px 22px;
}
.quote-card p {
  margin: 0 0 18px; color: #eceef8; font-size: 1rem; line-height: 1.7;
}
.quote-card span { color: var(--muted); font-size: 0.76rem; letter-spacing: 0.04em; }


.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; font-weight: 650; font-size: 1.04rem;
  padding: 20px 36px 20px 0; list-style: none; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute; right: 0; top: 20px;
  color: #9bb4ff; font-weight: 500;
}
.faq details[open] summary::after { content: "–"; }
.faq p { color: var(--muted); margin: 0 0 18px; max-width: 46rem; }

.end {
  width: var(--wrap);
  margin: 0 auto 80px;
  padding: 40px 44px;
  border-radius: 24px;
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  background: linear-gradient(120deg, rgba(46, 54, 102, 0.55), rgba(16, 16, 24, 0.92));
  border: 1px solid var(--line);
}
.end h2 { margin: 0; font-size: 1.55rem; }
.end p { color: var(--muted); margin: 8px 0 0; }
.cta-row, .row { display: flex; flex-wrap: wrap; gap: 12px; }
.modal-card .pill, .modal-card .ghost { width: 100%; margin: 8px 0 0; }
.modal-card p { color: var(--muted); margin: 0 0 8px; }

.foot {
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
  width: var(--wrap);
  margin: 0 auto;
  padding: 0 0 56px; color: #6f7388; font-size: 0.82rem;
}
.foot nav { display: flex; gap: 18px; flex-wrap: wrap; }
.updated { color: var(--muted); font-size: 0.8rem; margin: 0 0 16px; }
.updated { color: var(--muted); font-size: 0.8rem; margin: 0 0 16px; }
.crumbs { color: var(--muted); font-size: 0.86rem; margin: 8px 0 14px; }
.crumbs a { color: #c5d4ff; }

.lightbox {
  position: fixed; inset: 0; display: none; place-items: center;
  background: rgba(0,0,0,.84); z-index: 60; padding: 24px;
}
.lightbox.open { display: grid; }
.lightbox img { max-width: min(1100px, 92vw); max-height: 88vh; border-radius: 16px; }
.lightbox button {
  position: absolute; top: 18px; right: 18px;
  min-height: 40px; padding: 0 14px; border: 0; border-radius: 999px;
  background: #fff; cursor: pointer; font-weight: 700;
}

.modal { position: fixed; inset: 0; display: none; place-items: center; background: rgba(0,0,0,.55); z-index: 50; padding: 16px; }
.modal.open { display: grid; }
.modal-card { width: min(400px, 100%); background: #14141e; border-radius: 20px; padding: 24px; border: 1px solid var(--line); }
.field {
  width: 100%; margin: 8px 0 12px; padding: 12px 14px;
  border-radius: 12px; border: 1px solid rgba(255,255,255,.12);
  background: #0c0c14; color: #fff;
}

@media (max-width: 960px) {
  .hero { padding-top: 36px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-left { display: contents; }
  .hero-copy { order: 1; padding-top: 0; }
  .hero-stage { order: 2; min-height: 400px; }
  .metrics {
    order: 3; margin-top: 12px; padding-bottom: 0;
    display: grid; grid-template-columns: 1fr; gap: 16px; max-width: none;
  }
  .metrics div { border: 0; margin: 0; padding: 0; }
  .panel, .shot-band, .feats, .quotes, .shot-grid, .demo-grid { grid-template-columns: 1fr; }
  .chat-grid { grid-template-columns: 1fr 1fr; }
  .poster-strip { grid-template-columns: 1fr 1fr; }
  .poster-strip figure:first-child { grid-column: 1 / -1; }
  .poster-strip figure:first-child .poster-frame { aspect-ratio: 3 / 4; max-height: 420px; }
  .stage-dash { width: 86%; }
  .stage-poster { width: 46%; }
  .stage-poster img { height: 300px; }
  .window img { height: 240px; }
  .video-card video { max-height: 420px; }
  .top nav { display: none; }
  .top nav.open {
    display: flex; flex-direction: column;
    position: absolute; top: 68px; left: 0; right: 0;
    background: #0c0c14; padding: 18px 24px;
    border-bottom: 1px solid var(--line);
  }
  .menu-btn { display: block; }
  .end { flex-direction: column; align-items: flex-start; padding: 28px; }
  .foot { flex-direction: column; }
  .block { padding: 64px 0; }
}

@media (max-width: 640px) {
  .chat-grid { grid-template-columns: 1fr; }
  .video-card video { max-height: 420px; }
}