@charset "UTF-8";

:root {
  --bg: #082F47;
  --bg-2: #0C4A6E;
  --panel: #0E567F;
  --panel-2: #0B4566;
  --line: #1B6B93;
  --ink: #EEF9FE;
  --muted: #A5C8D8;
  --cyan: #67E8F9;
  --cyan-deep: #2BB6CC;
  --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) + 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: 1.75;
  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(--cyan); 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 13px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.2px;
  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(8, 47, 71, .94);
  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: 9px; font-size: 20px; font-weight: 900; letter-spacing: .3px; white-space: nowrap; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 10px; object-fit: contain; background: #0A3A57; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 5px;
  background: var(--cyan);
  color: #052C3F;
  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: 7px 0; border-bottom: 2px solid transparent; color: #A5C8D8; font-size: 13px; font-weight: 700; white-space: nowrap; }
.primary-nav a:hover { border-bottom-color: var(--cyan); 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 var(--cyan);
  border-radius: 6px;
  background: var(--cyan);
  color: #052C3F;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--cyan); }
.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: 8px; 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: gears */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(620px 380px at 82% 16%, rgba(103, 232, 249, .16), transparent 68%),
    radial-gradient(520px 320px at 2% 88%, rgba(103, 232, 249, .07), transparent 72%),
    linear-gradient(180deg, #0C4A6E 0%, var(--bg) 88%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: repeating-linear-gradient(135deg, rgba(103, 232, 249, .05) 0 1px, transparent 1px 34px);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  align-items: center;
  gap: clamp(24px, 4vw, 52px);
  padding: 56px 0 30px;
}
.hero-copy { min-width: 0; }
.hero-kicker { display: flex; align-items: center; gap: 8px; margin: 0 0 14px; color: #B7D7E4; font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.6px; }
.hero h1 {
  margin: 0;
  color: #fff;
  font-size: clamp(46px, 7.6vw, 88px);
  font-weight: 900;
  letter-spacing: clamp(-1px, -.3vw, -3px);
  line-height: 1;
}
.hero-subtitle { margin: 15px 0 0; color: var(--cyan); font-size: clamp(17px, 1.9vw, 22px); font-weight: 800; line-height: 1.4; }
.hero-lead { max-width: 500px; margin: 13px 0 0; color: #B7D7E4; font-size: 13.6px; line-height: 1.85; }
.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: 13px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--cyan); color: #052C3F; box-shadow: 0 12px 28px rgba(103, 232, 249, .22); }
.button-primary:hover { background: #8DF0FF; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #C6E2EC; border-bottom: 1px dashed #2C7396; font-size: 12.8px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--cyan); }

.gear-stage { position: relative; min-height: 360px; }
.gear { position: absolute; border-radius: 50%; background: rgba(103, 232, 249, .05); border: 2px solid rgba(103, 232, 249, .5); animation: spin 20s linear infinite; }
.gear::before {
  position: absolute;
  inset: -11px;
  border-radius: 50%;
  content: "";
  background: repeating-conic-gradient(from 0deg, rgba(103, 232, 249, .85) 0 7deg, transparent 7deg 24deg);
  -webkit-mask: radial-gradient(circle, transparent 0 61%, #000 62%);
  mask: radial-gradient(circle, transparent 0 61%, #000 62%);
}
.gear::after { position: absolute; inset: 33%; border: 2px solid rgba(103, 232, 249, .65); border-radius: 50%; content: ""; background: rgba(8, 47, 71, .92); }
.gear-a { top: 4%; left: 4%; width: 190px; height: 190px; }
.gear-b { top: 34%; right: 2%; width: 132px; height: 132px; animation-duration: 14s; animation-direction: reverse; }
.gear-c { bottom: 0; left: 34%; width: 96px; height: 96px; animation-duration: 11s; }
@keyframes spin { to { transform: rotate(360deg); } }
.gear-label {
  position: absolute;
  padding: 3px 9px;
  border: 1px solid rgba(103, 232, 249, .4);
  border-radius: 4px;
  background: rgba(8, 47, 71, .8);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .5px;
}
.label-a { top: 0; left: 46%; }
.label-b { top: 26%; right: 6%; }
.label-c { bottom: 8%; left: 18%; }

.speed-strip {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px 26px;
  padding: 16px 20px;
  margin: 0 0 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(12, 74, 110, .6);
  list-style: none;
}
.speed-strip li { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 10px; }
.speed-strip span { color: #C6E2EC; font-size: 11.5px; white-space: nowrap; }
.speed-strip i { display: block; height: 4px; border-radius: 2px; background: linear-gradient(90deg, var(--cyan) var(--fill), rgba(103, 232, 249, .16) var(--fill)); }
.speed-strip b { color: var(--cyan); font-family: var(--mono); font-size: 11px; }

/* features: 2 x 2 */
.features { padding: 70px 0 76px; 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(23px, 2.7vw, 34px); font-weight: 900; letter-spacing: -.5px; line-height: 1.3; }
.section-heading > p:last-child { max-width: 640px; margin: 11px 0 0; color: var(--muted); font-size: 13.6px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(200px, 300px); align-items: end; gap: 26px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.feature-card {
  position: relative;
  padding: 24px 24px 22px 76px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: linear-gradient(160deg, rgba(103, 232, 249, .08), transparent 58%), var(--panel-2);
}
.feature-no {
  position: absolute;
  top: 24px;
  left: 24px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
}
.feature-card h3 { margin: 0 0 7px; font-size: 18px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.8; }

/* shots: four equal vertical strips */
.shots { padding: 70px 0 78px; }
.shot-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; align-items: stretch; }
.shot-card { display: flex; flex-direction: column; margin: 0; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); overflow: hidden; }
.shot-card img { width: 100%; height: 100%; flex: 1; min-height: 0; aspect-ratio: 9 / 16; object-fit: cover; object-position: center 12%; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 8px; padding: 11px 13px 12px; border-top: 1px solid var(--line); }
.shot-card figcaption b { color: var(--cyan); font-family: var(--mono); font-size: 10px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 13px; font-weight: 800; line-height: 1.4; }
.shot-card figcaption small { color: var(--muted); font-size: 10.5px; font-weight: 500; }

/* faq */
.faq { padding: 70px 0 78px; border-top: 1px solid var(--line); background: var(--bg-2); }
.faq-layout { display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: clamp(24px, 4vw, 52px); }
.faq-heading { position: sticky; top: calc(var(--header-height) + 26px); align-self: start; }
.faq-list { 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: 17px 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: 900; }
.faq-list summary i { position: relative; flex: none; width: 22px; height: 22px; border: 1px solid var(--line); border-radius: 4px; transform: rotate(45deg); }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 8px; height: 1.5px; content: ""; background: var(--cyan); 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 17px 0; margin: 0; color: var(--muted); font-size: 13.4px; line-height: 1.85; }

/* reviews: one column */
.reviews { padding: 72px 0 80px; }
.review-list { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.review-card {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  align-items: start;
  gap: 6px 22px;
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan-deep);
  border-radius: 6px;
  background: var(--panel-2);
}
.review-card time { color: #7FA9BC; font-family: var(--mono); font-size: 10px; }
.review-card b { display: block; margin-bottom: 4px; color: var(--cyan); font-size: 13px; font-weight: 900; }
.review-card p { margin: 0; color: #C8DFE9; font-size: 13px; line-height: 1.75; }

/* steps: vertical with left rail */
.steps { padding: 70px 0 76px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-list { position: relative; display: grid; gap: 12px; padding: 0 0 0 54px; margin: 0; list-style: none; }
.step-list::after {
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 15px;
  width: 2px;
  content: "";
  background: linear-gradient(180deg, var(--cyan), rgba(103, 232, 249, .12));
}
.step-list li {
  position: relative;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}
.step-list li::before {
  position: absolute;
  top: 50%;
  left: -45px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  content: "";
  background: var(--bg-2);
  transform: translateY(-50%);
}
.step-list span { color: var(--cyan); font-family: var(--mono); font-size: 24px; font-weight: 700; line-height: 1; }
.step-list h3 { margin: 0 0 4px; font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.7; }

/* download: centered */
.download { padding: 30px 0 34px; }
.download-inner {
  padding: 48px clamp(24px, 5vw, 60px) 44px;
  border: 1px solid #2A7FA6;
  border-radius: 12px;
  background:
    radial-gradient(420px 240px at 88% 0%, rgba(103, 232, 249, .24), transparent 70%),
    linear-gradient(120deg, #0F5C83, #0C4A6E 84%);
  text-align: center;
}
.download .eyebrow { justify-content: center; }
.download h2 { max-width: 680px; margin: 0 auto; }
.download-inner > p { max-width: 520px; margin: 12px auto 22px; color: #B7D7E4; font-size: 13.6px; }
.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(103, 232, 249, .22); list-style: none; }
.download-notes li { color: #9EDCEC; font-family: var(--mono); font-size: 10.5px; }
.download-notes li::before { margin-right: 8px; content: "·"; color: var(--cyan); }

/* 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: 900; }
.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: #A5C8D8; font-size: 12px; }
.footer-nav a:hover { color: var(--cyan); }
.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: #7FA9BC; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 340px); gap: 22px; padding-top: 44px; }
  .gear-stage { min-height: 300px; }
  .gear-a { width: 160px; height: 160px; }
  .gear-b { width: 112px; height: 112px; }
  .gear-c { width: 82px; height: 82px; }
  .shot-grid { gap: 10px; }
  .faq-layout { gap: 28px; }
}
@media (max-width: 768px) {
  .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, .5);
  }
  .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); }
  .hero-grid { grid-template-columns: 1fr; padding: 36px 0 20px; }
  .gear-stage { min-height: 260px; max-width: 420px; margin: 0 auto; width: 100%; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-heading { position: static; }
  .shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .speed-strip { grid-template-columns: 1fr; gap: 12px; }
  .review-card { grid-template-columns: 120px minmax(0, 1fr); }
  .section-heading-split { grid-template-columns: 1fr; gap: 9px; }
  .section-heading-split > p:last-child { margin: 0; }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .nav-shell { gap: 10px; }
  .brand { font-size: 16px; gap: 7px; }
  .brand img { width: 32px; height: 32px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 38px; padding: 0 10px; font-size: 11.5px; gap: 6px; }
  .menu-toggle { width: 38px; height: 38px; }
  .hero h1 { font-size: clamp(42px, 14vw, 60px); }
  .hero-actions { gap: 12px; }
  .button { width: 100%; }
  .gear-stage { min-height: 230px; }
  .gear-a { width: 130px; height: 130px; }
  .gear-b { width: 92px; height: 92px; }
  .gear-c { width: 68px; height: 68px; }
  .gear-label { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 20px 18px 18px 58px; }
  .feature-no { top: 20px; left: 18px; font-size: 13px; }
  .shot-grid { gap: 9px; }
  .shot-card figcaption { flex-direction: column; gap: 2px; padding: 9px 11px 10px; }
  .review-card { grid-template-columns: 1fr; gap: 4px; padding: 14px 16px; }
  .review-card time { order: 2; }
  .step-list { padding-left: 40px; }
  .step-list::after { left: 11px; }
  .step-list li { grid-template-columns: 56px minmax(0, 1fr); gap: 12px; padding: 14px 15px; }
  .step-list li::before { left: -34px; }
  .step-list span { font-size: 19px; }
  .download-inner { padding: 34px 20px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 15px; }
  .nav-download { min-height: 34px; padding: 0 8px; font-size: 10.5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
  .hero h1 { font-size: 40px; }
  .hero-subtitle { font-size: 15px; }
  .hero-lead { font-size: 12.8px; }
  .gear-stage { min-height: 200px; }
  .gear-a { width: 110px; height: 110px; }
  .gear-b { width: 80px; height: 80px; }
  .gear-c { width: 58px; height: 58px; }
  .download-inner { padding: 26px 16px; }
}