@charset "UTF-8";

:root {
  --bg: #07070B;
  --bg-2: #0A0B11;
  --panel: #0C0F16;
  --line: #1B2430;
  --line-strong: #2B3B4B;
  --ink: #E9F4FC;
  --muted: #9BAEC0;
  --accent: #7DD3FC;
  --accent-deep: #3A8FB5;
  --shell: 1120px;
  --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) + 18px); }
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;
  overflow-wrap: anywhere;
}
img { display: block; max-width: 100%; }
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(--accent); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.4px;
  line-height: 1.4;
}
.eyebrow::before { width: 16px; height: 2px; content: ""; background: currentColor; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 7, 11, .9);
  backdrop-filter: blur(14px);
}
.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: 20px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 10px; font-size: 20px; font-weight: 800; letter-spacing: 2px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 50%; object-fit: contain; background: #0B0E14; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 1px solid rgba(125, 211, 252, .5);
  color: var(--accent);
  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, 1.9vw, 25px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; border-bottom: 2px solid transparent; color: #A9BCCD; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--accent); color: #fff; }
.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: 8px;
  padding: 0 18px;
  border: 1px solid rgba(125, 211, 252, .7);
  border-radius: 999px;
  background: rgba(125, 211, 252, .12);
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: var(--accent); color: #051018; }
.nav-download svg, .button svg { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 0; border: 1px solid var(--line); border-radius: 10px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 18px; 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: full-bleed dark with a vertical glowing seam */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: min(86vh, 760px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(760px 460px at 50% 46%, rgba(125, 211, 252, .12), transparent 72%),
    radial-gradient(300px 620px at 50% 50%, rgba(125, 211, 252, .07), transparent 78%),
    #07070B;
}
.seam, .seam-glow, .seam-core { position: absolute; pointer-events: none; }
.seam { inset: 0; }
.seam-core {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, rgba(125, 211, 252, .12) 16%, rgba(236, 250, 255, .95) 48%, rgba(125, 211, 252, .85) 54%, rgba(125, 211, 252, .1) 84%, transparent);
  box-shadow: 0 0 16px rgba(125, 211, 252, .75), 0 0 74px rgba(125, 211, 252, .38);
}
.seam-glow {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 130px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, rgba(125, 211, 252, .16), rgba(125, 211, 252, .3), rgba(125, 211, 252, .16), transparent);
  filter: blur(16px);
  opacity: .8;
}
.hero-copy { position: relative; z-index: 2; padding: 96px 24px; text-align: center; }
.hero-copy::before {
  position: absolute;
  inset: 6% -18%;
  z-index: -1;
  content: "";
  background: radial-gradient(58% 54% at 50% 50%, rgba(7, 7, 11, .9) 0%, rgba(7, 7, 11, .74) 46%, rgba(7, 7, 11, 0) 80%);
  filter: blur(6px);
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: #A9BCCD;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 2px;
}
.hero-kicker b {
  padding: 3px 8px;
  border: 1px solid rgba(125, 211, 252, .45);
  border-radius: 4px;
  color: var(--accent);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.6px;
}
.hero h1 {
  margin: 0;
  color: #EAF7FF;
  font-size: clamp(62px, 11.5vw, 142px);
  font-weight: 300;
  letter-spacing: .08em;
  line-height: 1;
  text-indent: .08em;
  text-shadow: 0 0 26px rgba(125, 211, 252, .5), 0 0 90px rgba(125, 211, 252, .28);
}
.hero-subtitle {
  margin: 22px 0 0;
  color: var(--accent);
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 700;
  letter-spacing: .06em;
}
.hero-lead { max-width: 470px; margin: 14px auto 0; color: var(--muted); font-size: 14px; }
.hero-actions { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 18px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 12px;
  padding: 0 28px;
  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(--accent); color: #051018; box-shadow: 0 14px 34px rgba(125, 211, 252, .2); }
.button-primary:hover { background: #A5E3FF; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 34px; font-size: 15px; }
.text-link { color: #B9CBD9; border-bottom: 1px dashed #34506A; font-size: 12.5px; font-weight: 700; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--accent); }
.seam-dot {
  position: absolute;
  left: 50%;
  bottom: 30px;
  width: 8px;
  height: 8px;
  margin-left: -4px;
  border-radius: 50%;
  background: #C7EDFF;
  box-shadow: 0 0 14px 4px rgba(125, 211, 252, .5);
  animation: breathe 3.4s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { opacity: .3; transform: scale(.75); }
  50% { opacity: 1; transform: scale(1.18); }
}

/* sections */
section { position: relative; }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(23px, 2.6vw, 32px); font-weight: 800; letter-spacing: -.3px; line-height: 1.34; }
.section-heading > p:last-child { max-width: 600px; margin: 12px 0 0; color: var(--muted); font-size: 13.5px; }
.section-heading-center { text-align: center; }
.section-heading-center .eyebrow { justify-content: center; }
.section-heading-center > p:last-child { margin-right: auto; margin-left: auto; }

/* features 2x2 */
.features { padding: 76px 0 80px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.feature-card {
  position: relative;
  padding: 26px 24px 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: linear-gradient(120deg, rgba(125, 211, 252, .05), transparent 56%), var(--panel);
}
.feature-card::before { position: absolute; top: 0; left: 0; width: 44px; height: 1px; content: ""; background: var(--accent); }
.feature-no { display: block; margin-bottom: 10px; color: var(--accent); font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: 2px; }
.feature-card h3 { margin: 0 0 7px; font-size: 17px; font-weight: 800; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.8; }

/* shots: four equal vertical strips */
.shots { padding: 76px 0 82px; }
.shot-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.shot-card { margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); }
.shot-card img { width: 100%; height: auto; aspect-ratio: 9 / 16; object-fit: cover; object-position: center 8%; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 8px; padding: 10px 12px 11px; border-top: 1px solid var(--line); }
.shot-card figcaption b { color: var(--accent); font-family: var(--mono); font-size: 9.5px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 12.5px; font-weight: 800; line-height: 1.45; }
.shot-card figcaption small { color: var(--muted); font-size: 10px; font-weight: 500; }

/* faq: single column, centered heading */
.faq { padding: 74px 0 80px; border-top: 1px solid var(--line); background: var(--bg-2); }
.faq-list { max-width: 840px; margin: 0 auto; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 0; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-size: 15.5px; font-weight: 800; }
.faq-list summary i { position: relative; flex: none; width: 22px; height: 22px; border: 1px solid var(--line-strong); border-radius: 50%; }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 8px; height: 1.5px; content: ""; background: var(--accent); 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 26px 18px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: single column */
.reviews { padding: 74px 0 80px; }
.review-list { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.review-card {
  display: grid;
  grid-template-columns: minmax(0, 170px) minmax(0, 1fr);
  align-items: start;
  gap: 4px 24px;
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-left: 1px solid rgba(125, 211, 252, .55);
  border-radius: 6px;
  background: var(--panel);
}
.review-meta { display: flex; flex-direction: column; gap: 3px; }
.review-meta b { color: #CFE8F7; font-size: 13px; font-weight: 800; }
.review-meta time { color: #6C8194; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #BACBD8; font-size: 13px; line-height: 1.75; }

/* steps: vertical with a line on the left */
.steps { padding: 70px 0 78px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-list { position: relative; display: grid; gap: 12px; max-width: 760px; padding: 0 0 0 46px; margin: 0; list-style: none; }
.step-list::before { position: absolute; top: 16px; bottom: 16px; left: 15px; width: 1px; content: ""; background: linear-gradient(180deg, rgba(125, 211, 252, .6), rgba(125, 211, 252, .04)); }
.step-list li { position: relative; padding: 18px 20px 17px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); }
.step-list span {
  position: absolute;
  top: 15px;
  left: -46px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 31px;
  height: 31px;
  border: 1px solid rgba(125, 211, 252, .45);
  border-radius: 50%;
  background: var(--bg-2);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
}
.step-list h3 { margin: 0 0 4px; font-size: 16px; font-weight: 800; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.75; }

/* download: centered */
.download { padding: 28px 0; }
.download-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 52px clamp(22px, 5vw, 56px) 44px;
  border: 1px solid #1E3446;
  border-radius: 10px;
  background:
    radial-gradient(460px 260px at 50% 0%, rgba(125, 211, 252, .18), transparent 72%),
    linear-gradient(180deg, #0B1119, #090B11);
  text-align: center;
}
.download .eyebrow { justify-content: center; }
.download h2 { max-width: 620px; }
.download-inner > p { max-width: 480px; margin: 12px 0 22px; color: var(--muted); font-size: 13.5px; }
.download-notes { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 22px; padding: 18px 0 0; margin: 24px 0 0; border-top: 1px solid rgba(125, 211, 252, .16); list-style: none; }
.download-notes li { color: #8FBCD4; font-family: var(--mono); font-size: 10.5px; }
.download-notes li::before { margin-right: 7px; content: "·"; color: var(--accent); }

/* footer */
.site-footer { padding: 42px 0 50px; border-top: 1px solid var(--line); }
.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: 800; letter-spacing: 2px; }
.footer-brand p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer-nav a { color: #A9BCCD; font-size: 12px; }
.footer-nav a:hover { color: var(--accent); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 22px; padding-top: 17px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer-meta p { margin: 0; }
.footer-meta a { color: var(--muted); }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #6C8194; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .hero-copy { padding: 80px 20px; }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 16px;
    border-bottom: 1px solid var(--line);
    background: var(--bg);
    box-shadow: 0 16px 26px rgba(0, 0, 0, .6);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .review-card { grid-template-columns: 1fr; gap: 8px; }
  .review-meta { flex-direction: row; align-items: baseline; justify-content: space-between; }
}
@media (max-width: 768px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero { min-height: 78vh; }
  .hero h1 { letter-spacing: .06em; }
  .hero-copy::before { inset: 2% -22%; }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero-copy { padding: 66px 14px 84px; }
  .hero-lead { font-size: 13.5px; }
  .shot-grid { gap: 10px; }
  .step-list { padding-left: 38px; }
  .step-list span { left: -38px; width: 26px; height: 26px; font-size: 10px; }
  .step-list::before { left: 12px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 16px; gap: 7px; letter-spacing: 1px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-actions { gap: 8px; }
  .nav-download { min-height: 34px; padding: 0 10px; font-size: 11px; gap: 5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
  .hero h1 { font-size: 58px; }
  .hero-subtitle { font-size: 15.5px; }
  .button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .seam-dot { animation: none; opacity: .85; }
}