@charset "UTF-8";

:root {
  --bg: #f6f8fe;
  --bg-2: #ffffff;
  --panel: #ffffff;
  --line: #dde4f4;
  --ink: #161c2e;
  --muted: #5d6884;
  --blue: #2f6bff;
  --orange: #ff8a3d;
  --shell: 1180px;
  --header-height: 70px;
  --mono: "JetBrains Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
svg { display: block; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 12px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1.4;
}
.eyebrow::before { width: 14px; height: 2px; content: ""; background: currentColor; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(12px);
}
.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 48px), var(--shell));
  min-height: var(--header-height);
  margin: 0 auto;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 9px; font-size: 21px; font-weight: 900; letter-spacing: -.4px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 12px; object-fit: contain; background: #eef3ff; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 6px;
  background: var(--orange);
  color: #2a1203;
  font-size: 10px;
  font-style: normal;
  font-weight: 900;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.8vw, 24px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; color: #4b5673; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { color: var(--blue); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  gap: 7px;
  padding: 0 18px;
  border: 1px solid var(--blue);
  border-radius: 999px;
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  box-shadow: 0 8px 18px rgba(47, 107, 255, .22);
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: #fff; color: var(--blue); }
.nav-download svg, .button svg { width: 17px; height: 17px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 40px; height: 40px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 17px; height: 2px; margin: 5px auto; background: var(--ink); transition: transform .18s ease; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* hero: avatars + topic cards + chat bar */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(520px 320px at 6% 8%, rgba(47, 107, 255, .12), transparent 70%),
    radial-gradient(460px 300px at 96% 88%, rgba(255, 138, 61, .16), transparent 72%),
    var(--bg);
}
.hero::after {
  position: absolute;
  inset: auto 0 46px 0;
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(280px, .98fr);
  align-items: center;
  gap: clamp(26px, 4vw, 56px);
  padding: 54px 0 30px;
}
.hero-left { min-width: 0; }
.avatar-row { display: flex; align-items: center; margin: 0 0 18px; }
.av {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-right: -10px;
  border: 2px solid #fff;
  border-radius: 50%;
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  box-shadow: 0 4px 10px rgba(22, 28, 46, .12);
}
.av-1 { background: linear-gradient(140deg, #2f6bff, #7aa2ff); }
.av-2 { background: linear-gradient(140deg, #ff8a3d, #ffb787); }
.av-3 { background: linear-gradient(140deg, #7b5cff, #b3a3ff); }
.av-4 { background: linear-gradient(140deg, #1aa6a6, #6fd6d6); }
.av-5 { background: linear-gradient(140deg, #ff6f9c, #ffa8c2); }
.av-6 { background: linear-gradient(140deg, #3b465c, #6d7a94); }
.hero-kicker {
  margin: 0 0 12px;
  color: #4c5a7b;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.6px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(52px, 7.4vw, 92px);
  font-weight: 900;
  letter-spacing: clamp(-3px, -.5vw, -5px);
  line-height: .96;
}
.hero-subtitle {
  margin: 16px 0 0;
  color: var(--orange);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 800;
  line-height: 1.4;
}
.hero-lead { max-width: 480px; margin: 12px 0 0; color: var(--muted); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; margin-top: 24px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 12px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--blue); color: #fff; box-shadow: 0 12px 26px rgba(47, 107, 255, .26); }
.button-primary:hover { background: #1d57e6; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #3d4a68; border-bottom: 1px dashed #b8c4de; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 4px; color: var(--orange); }

.topic-stack { display: grid; gap: 10px; }
.topic-card {
  padding: 16px 18px 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 10px 24px rgba(28, 44, 84, .07);
}
.topic-card-hot { border-color: rgba(47, 107, 255, .34); }
.topic-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.topic-tag { color: var(--blue); font-size: 12px; font-weight: 900; }
.topic-live {
  padding: 1px 7px;
  border-radius: 999px;
  background: rgba(255, 138, 61, .16);
  color: #c15a10;
  font-size: 10px;
  font-weight: 900;
}
.topic-title { margin: 0; font-size: 15.5px; font-weight: 900; line-height: 1.45; }
.topic-meta { margin: 6px 0 0; color: #6d7893; font-size: 11.5px; }
.topic-thumbs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; margin: 10px 0 2px; }
.topic-thumbs img { width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; border-radius: 8px; }
.topic-bar { display: block; height: 4px; margin-top: 11px; border-radius: 999px; background: linear-gradient(90deg, var(--blue) 62%, #e4eaf8 62%); }
.topic-card:nth-child(2) .topic-bar { background: linear-gradient(90deg, var(--orange) 44%, #f2e6dc 44%); }
.topic-card-mini { background: #f9faff; box-shadow: none; }
.topic-card-mini .topic-meta { margin: 0; }

.chat-bar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 34px;
  padding: 11px 12px 11px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 12px 26px rgba(28, 44, 84, .09);
}
.chat-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  font-weight: 900;
}
.chat-placeholder { flex: 1; min-width: 0; color: #9aa4bd; font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-chips { display: flex; flex: none; gap: 6px; }
.chat-chips i { padding: 2px 9px; border: 1px solid #d9e2f7; border-radius: 999px; color: #5f6c8a; font-size: 11px; font-style: normal; }
.chat-send { flex: none; padding: 7px 18px; border-radius: 999px; background: var(--orange); color: #2c1403; font-size: 12.5px; font-weight: 900; }

/* features: two columns, icon left */
.features { padding: 70px 0 74px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(24px, 2.7vw, 34px); font-weight: 900; letter-spacing: -.7px; line-height: 1.32; }
.section-heading > p:last-child { max-width: 620px; margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(200px, 290px); align-items: end; gap: 26px; }
.section-heading-split > p:last-child { margin: 0 0 5px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.feature-card {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 20px 20px 19px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
}
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(47, 107, 255, .1);
  color: var(--blue);
  font-size: 17px;
  font-weight: 900;
}
.feature-card:nth-child(2) .feature-icon { background: rgba(255, 138, 61, .14); color: #d96513; }
.feature-card:nth-child(4) .feature-icon { background: rgba(47, 107, 255, .1); color: var(--blue); }
.feature-card h3 { margin: 0 0 5px; font-size: 16.5px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* shots: one wide strip + three cards */
.shots { padding: 70px 0 76px; background: var(--bg); }
.shot-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.shot-card { margin: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); overflow: hidden; }
.shot-card img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; object-position: center 18%; }
.shot-card figcaption { display: flex; flex-wrap: wrap; align-items: baseline; gap: 7px; padding: 10px 12px 12px; border-top: 1px solid var(--line); font-size: 12.5px; font-weight: 800; }
.shot-card figcaption b { color: var(--blue); font-family: var(--mono); font-size: 10px; }
.shot-card figcaption small { flex-basis: 100%; color: #6d7893; font-size: 10.5px; font-weight: 500; }
.shot-card-wide {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  align-items: center;
}
.shot-card-wide img { aspect-ratio: 1 / 1; border-right: 1px solid var(--line); }
.shot-card-wide figcaption { border-top: 0; font-size: 14px; padding: 18px 22px; }
.shot-card-wide figcaption small { margin-top: 4px; font-size: 12px; }

/* faq: single column list */
.faq { padding: 70px 0 76px; border-top: 1px solid var(--line); background: var(--bg-2); }
.faq-layout { display: grid; gap: 26px; }
.faq-heading { max-width: 560px; }
.faq-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; align-items: start; }
.faq-list details { border: 1px solid var(--line); border-radius: 12px; background: #fbfcff; }
.faq-list details[open] { border-color: rgba(47, 107, 255, .3); background: #fff; }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-size: 14.5px; font-weight: 900; line-height: 1.5; }
.faq-list summary i { position: relative; flex: none; width: 20px; height: 20px; border-radius: 50%; background: rgba(47, 107, 255, .1); }
.faq-list summary i::before,
.faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 1.5px;
  content: "";
  background: var(--blue);
  transform: translate(-50%, -50%);
}
.faq-list summary i::after { transform: translate(-50%, -50%) rotate(90deg); transition: transform .2s ease; }
.faq-list details[open] summary i::after { transform: translate(-50%, -50%) rotate(0); }
.faq-list details p { padding: 0 16px 15px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* reviews: two columns */
.reviews { padding: 70px 0 76px; }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 17px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); box-shadow: 0 6px 16px rgba(28, 44, 84, .05); }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 6px; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px dashed var(--line); }
.review-meta b { color: var(--blue); font-size: 13px; font-weight: 900; }
.review-meta time { color: #93a0ba; font-family: var(--mono); font-size: 10.5px; }
.review-card p { margin: 0; color: #46516c; font-size: 13px; line-height: 1.85; }

/* steps: three across with connectors */
.steps { padding: 70px 0 76px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-list { position: relative; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.step-list li { position: relative; padding: 20px 18px 18px; border: 1px solid var(--line); border-radius: 12px; background: #fbfcff; }
.step-list li::after {
  position: absolute;
  top: 34px;
  right: -12px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--orange);
  border-right: 2px solid var(--orange);
  content: "";
  transform: rotate(45deg);
}
.step-list li:last-child::after { display: none; }
.step-list span { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; margin-bottom: 10px; border-radius: 9px; background: rgba(47, 107, 255, .1); color: var(--blue); font-family: var(--mono); font-size: 12px; font-weight: 700; }
.step-list h3 { margin: 0 0 6px; font-size: 16.5px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* download: centered */
.download { padding: 26px 0; background: var(--bg); }
.download-inner {
  padding: 48px clamp(22px, 5vw, 56px) 42px;
  border-radius: 18px;
  background:
    radial-gradient(420px 240px at 8% 0%, rgba(255, 255, 255, .5), transparent 70%),
    linear-gradient(120deg, #2f6bff, #4d87ff 62%, #6f9dff);
  color: #fff;
  text-align: center;
}
.download .eyebrow { justify-content: center; color: #dce7ff; }
.download h2 { max-width: 620px; margin: 0 auto; color: #fff; }
.download-inner > p { max-width: 540px; margin: 12px auto 24px; color: #e2eaff; font-size: 14px; }
.download .button-primary { background: #fff; color: #1b3c96; box-shadow: 0 14px 26px rgba(11, 32, 88, .25); }
.download .button-primary:hover { background: #eef3ff; }
.download-notes { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 20px; padding: 20px 0 0; margin: 26px 0 0; border-top: 1px solid rgba(255, 255, 255, .3); list-style: none; }
.download-notes li { color: #dde7ff; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 7px; content: "◇"; color: #ffb27a; }

/* footer */
.site-footer { padding: 42px 0 50px; border-top: 1px solid var(--line); background: var(--bg-2); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 40px; align-items: start; }
.footer-brand strong { font-size: 18px; font-weight: 900; }
.footer-brand p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-nav a { color: #4d5873; font-size: 12px; }
.footer-nav a:hover { color: var(--blue); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); color: #7d89a4; font-size: 12px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: #7d89a4; }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #8b95ab; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 26px; }
  .topic-stack { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topic-card-mini { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 14px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    box-shadow: 0 16px 26px rgba(20, 40, 80, .12);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 11px 0; border-bottom: 1px solid var(--line); }
  .feature-grid { grid-template-columns: 1fr; }
  .faq-list { grid-template-columns: 1fr; }
  .review-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; gap: 10px; }
  .step-list li::after { top: auto; right: 24px; bottom: -9px; transform: rotate(135deg); }
  .shot-card-wide { grid-template-columns: 1fr; }
  .shot-card-wide img { aspect-ratio: 16 / 10; border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 30px); }
  .hero h1 { font-size: clamp(44px, 14vw, 62px); }
  .hero-lead { font-size: 14px; }
  .topic-stack { grid-template-columns: 1fr; }
  .chat-bar { gap: 8px; padding: 9px 10px 9px 12px; }
  .chat-placeholder { font-size: 12px; }
  .chat-chips { display: none; }
  .chat-send { padding: 6px 14px; }
  .shot-grid { grid-template-columns: 1fr; }
  .shot-grid .shot-card:not(.shot-card-wide) { display: grid; grid-template-columns: 120px minmax(0, 1fr); align-items: center; }
  .shot-grid .shot-card:not(.shot-card-wide) img { aspect-ratio: 1 / 1; border-right: 1px solid var(--line); }
  .shot-grid .shot-card:not(.shot-card-wide) figcaption { border-top: 0; }
  .section-heading-split { grid-template-columns: 1fr; gap: 9px; }
  .section-heading-split > p:last-child { margin: 0; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 17px; gap: 6px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 34px; padding: 0 10px; font-size: 11px; gap: 4px; }
  .nav-download svg { width: 13px; height: 13px; }
  .menu-toggle { width: 34px; height: 34px; }
  .hero h1 { font-size: 42px; }
  .hero-subtitle { font-size: 16px; }
  .button { width: 100%; }
  .av { width: 34px; height: 34px; font-size: 11px; }
  .chat-avatar { display: none; }
}