@charset "UTF-8";

:root {
  --bg: #0B1F1A;
  --bg-2: #0E2620;
  --panel: #103029;
  --line: #1D4639;
  --line-strong: #2A6150;
  --ink: #EAFBF3;
  --muted: #9FBDB2;
  --accent: #10B981;
  --accent-soft: #5EEAD4;
  --shell: 1160px;
  --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(11, 31, 26, .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: 10px; font-size: 20px; font-weight: 900; letter-spacing: .4px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 10px; object-fit: contain; background: #0A1C17; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 5px;
  background: var(--accent);
  color: #052A20;
  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: #A9C6BA; 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 var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #052A20;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--accent); }
.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 with a radar disc */
.hero {
  position: relative;
  padding: 44px 0 34px;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(620px 380px at 50% 84%, rgba(16, 185, 129, .16), transparent 70%),
    radial-gradient(360px 300px at 6% 4%, rgba(16, 185, 129, .1), transparent 72%),
    linear-gradient(180deg, #0E2A22, var(--bg) 92%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: radial-gradient(rgba(16, 185, 129, .16) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(70% 60% at 50% 60%, #000, transparent 78%);
  pointer-events: none;
}
.radar-count {
  position: absolute;
  top: 22px;
  left: max(24px, calc((100% - var(--shell)) / 2));
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 6px 13px;
  border: 1px solid rgba(16, 185, 129, .42);
  border-radius: 999px;
  background: rgba(10, 28, 23, .82);
  font-size: 10.5px;
  letter-spacing: 1px;
}
.radar-count span { color: #86D8BA; }
.radar-count b { color: var(--accent); font-family: var(--mono); font-size: 14px; letter-spacing: 0; }
.hero-copy { position: relative; z-index: 2; max-width: 720px; margin: 0 auto; text-align: center; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  color: #A9C6BA;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 1.8px;
}
.hero-kicker b {
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(16, 185, 129, .18);
  color: var(--accent);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.4px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(52px, 7.4vw, 92px);
  font-weight: 900;
  letter-spacing: clamp(-1px, -.2vw, -3px);
  line-height: 1.02;
  background: linear-gradient(96deg, #FFFFFF 12%, #A7F3D0 60%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle { margin: 14px 0 0; color: var(--accent-soft); font-size: clamp(17px, 2vw, 22px); font-weight: 800; }
.hero-lead { max-width: 520px; margin: 12px 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: 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: 6px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--accent); color: #052A20; box-shadow: 0 14px 30px rgba(16, 185, 129, .22); }
.button-primary:hover { background: #34D399; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #BBD8CC; border-bottom: 1px dashed #2E6B57; font-size: 12.5px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--accent); }

.radar-stage { position: relative; z-index: 1; width: min(100%, 452px); aspect-ratio: 1 / 1; margin: 18px auto 0; }
.radar-disc {
  position: absolute;
  inset: 13%;
  overflow: hidden;
  border: 1px solid rgba(16, 185, 129, .45);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(16, 185, 129, .18), rgba(9, 24, 20, .92) 72%);
  box-shadow: inset 0 0 54px rgba(16, 185, 129, .2), 0 0 50px rgba(16, 185, 129, .12);
}
.radar-ring { position: absolute; top: 50%; left: 50%; border: 1px dashed rgba(16, 185, 129, .3); border-radius: 50%; transform: translate(-50%, -50%); }
.ring-1 { width: 66%; height: 66%; }
.ring-2 { width: 33%; height: 33%; }
.radar-cross { position: absolute; top: 50%; left: 50%; background: rgba(16, 185, 129, .2); }
.cross-x { width: 100%; height: 1px; transform: translate(-50%, -50%); }
.cross-y { width: 1px; height: 100%; transform: translate(-50%, -50%); }
.radar-sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(16, 185, 129, .55), rgba(16, 185, 129, .16) 38deg, rgba(16, 185, 129, 0) 84deg, rgba(16, 185, 129, 0) 360deg);
  animation: sweep 7s linear infinite;
}
.radar-core { position: absolute; top: 50%; left: 50%; width: 8px; height: 8px; margin: -4px 0 0 -4px; border-radius: 50%; background: var(--accent-soft); box-shadow: 0 0 12px 3px rgba(94, 234, 212, .45); }
@keyframes sweep { to { transform: rotate(360deg); } }

.char-dot {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px 5px 5px;
  border: 1px solid rgba(16, 185, 129, .32);
  border-radius: 999px;
  background: rgba(9, 24, 20, .92);
  box-shadow: 0 10px 20px rgba(0, 0, 0, .38);
}
.char-dot i {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, #10B981, #0A5C46);
  color: #EAFBF3;
  font-size: 12px;
  font-style: normal;
  font-weight: 900;
}
.char-dot span { display: flex; flex-direction: column; font-size: 11.5px; font-weight: 800; line-height: 1.3; }
.char-dot small { color: #86D8BA; font-size: 9.5px; font-weight: 600; }
.dot-nw { top: 0; left: 0; }
.dot-ne { top: 9%; right: 0; }
.dot-sw { bottom: 12%; left: 2%; }
.dot-se { right: 8%; bottom: 4%; }

/* sections */
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(23px, 2.6vw, 33px); font-weight: 900; letter-spacing: -.5px; line-height: 1.3; }
.section-heading > p:last-child { max-width: 600px; margin: 12px 0 0; color: var(--muted); font-size: 13.5px; }
.section-heading-split { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px 32px; }
.section-heading-split > p { flex: none; margin: 0 0 4px; color: var(--muted); font-size: 13px; }

/* features: one tall card on the left, three stacked on the right */
.features { padding: 76px 0 80px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.feature-grid { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr); gap: 12px; }
.feature-card {
  position: relative;
  padding: 22px 22px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.feature-card h3 { margin: 0 0 6px; font-size: 16.5px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.8; }
.feature-lead {
  grid-row: span 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 30px 28px;
  border-color: var(--line-strong);
  background:
    radial-gradient(300px 220px at 88% 10%, rgba(16, 185, 129, .2), transparent 70%),
    linear-gradient(160deg, #123A30, #0E2620);
}
.feature-lead::before {
  position: absolute;
  right: 20px;
  bottom: 14px;
  content: "RADAR";
  color: rgba(16, 185, 129, .1);
  font-family: var(--mono);
  font-size: clamp(40px, 6vw, 76px);
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1;
}
.feature-no { display: block; margin-bottom: 9px; color: var(--accent); font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: 1.8px; }
.feature-lead h3 { font-size: 22px; }
.feature-lead p { max-width: 330px; font-size: 13.2px; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 16px 0 0; list-style: none; }
.feature-tags li { padding: 3px 11px; border: 1px solid rgba(16, 185, 129, .36); border-radius: 999px; color: #86D8BA; font-size: 10.5px; }

/* shots: 2 x 2 with a portrait image beside its caption */
.shots { padding: 76px 0 82px; }
.shot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.shot-card {
  display: grid;
  grid-template-columns: 40% minmax(0, 1fr);
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.shot-card img { width: 100%; height: 100%; min-height: 0; aspect-ratio: 9 / 16; object-fit: cover; object-position: center 6%; }
.shot-card figcaption { display: flex; flex-direction: column; justify-content: flex-end; gap: 4px; padding: 16px 18px; border-left: 1px solid var(--line); }
.shot-card figcaption b { color: var(--accent); font-family: var(--mono); font-size: 10px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 14px; font-weight: 900; line-height: 1.4; }
.shot-card figcaption small { margin-top: 3px; color: var(--muted); font-size: 10.5px; font-weight: 500; }

/* faq */
.faq { padding: 72px 0 78px; border-top: 1px solid var(--line); background: var(--bg-2); }
.faq-layout { display: grid; grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr); gap: clamp(24px, 4vw, 50px); }
.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-strong); border-radius: 4px; }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 9px; 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 17px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: two columns */
.reviews { padding: 74px 0 80px; }
.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 20px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}
.review-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 9px; }
.review-meta b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(16, 185, 129, .16);
  color: var(--accent-soft);
  font-size: 11.5px;
  font-weight: 900;
}
.review-meta time { margin-left: auto; color: #6E9386; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #B9D2C8; font-size: 12.8px; line-height: 1.8; }

/* steps: horizontal with numbers and arrows */
.steps { padding: 70px 0 76px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; padding: 0; margin: 0; list-style: none; }
.step-list li { position: relative; padding: 20px 20px 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.step-list li:not(:last-child)::after {
  position: absolute;
  top: 34px;
  right: -18px;
  content: "→";
  color: rgba(16, 185, 129, .6);
  font-size: 14px;
}
.step-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border: 1px solid rgba(16, 185, 129, .45);
  border-radius: 50%;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
}
.step-list h3 { margin: 0 0 5px; font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.75; }

/* download: button on the left, copy on the right */
.download { padding: 28px 0; }
.download-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 24px 38px;
  padding: 46px clamp(22px, 5vw, 54px) 40px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background:
    radial-gradient(420px 240px at 4% 0%, rgba(16, 185, 129, .22), transparent 70%),
    linear-gradient(110deg, #123A30, #0D241E 86%);
}
.download-copy { min-width: 0; }
.download h2 { max-width: 560px; }
.download-copy > p { max-width: 520px; margin: 12px 0 0; color: #B9D2C8; font-size: 13.5px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 16px 0 0; margin: 18px 0 0; border-top: 1px solid rgba(16, 185, 129, .2); list-style: none; }
.download-notes li { color: #86D8BA; 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: 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: #A9C6BA; 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: #6E9386; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature-lead { grid-row: span 1; }
  .download-inner { grid-template-columns: 1fr; }
  .download-inner .button { justify-self: start; }
}
@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, .55);
  }
  .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); }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-heading { position: static; }
  .section-heading-split { flex-direction: column; align-items: flex-start; }
  .section-heading-split > p { margin: 0; }
}
@media (max-width: 768px) {
  .review-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; gap: 12px; }
  .step-list li:not(:last-child)::after { top: auto; right: 22px; bottom: -17px; content: "↓"; }
  .shot-grid { grid-template-columns: 1fr; }
  .radar-stage { width: min(100%, 440px); }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero { padding: 64px 0 34px; }
  .hero-copy { text-align: left; }
  .hero-actions { justify-content: flex-start; }
  .radar-count { top: 16px; left: 16px; }
  .radar-stage { width: min(100%, 340px); }
  .char-dot { padding: 4px 9px 4px 4px; gap: 6px; }
  .char-dot i { width: 22px; height: 22px; font-size: 10.5px; }
  .char-dot span { font-size: 10.5px; }
  .char-dot small { font-size: 8.5px; }
  .shot-card { grid-template-columns: 38% minmax(0, 1fr); }
  .download-inner { padding: 30px 18px 28px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 16px; gap: 7px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-actions { gap: 8px; }
  .nav-download { min-height: 34px; padding: 0 9px; font-size: 11px; gap: 5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
  .hero h1 { font-size: 40px; }
  .hero-subtitle { font-size: 15.5px; }
  .button { width: 100%; }
  .char-dot small { display: none; }
  .radar-stage { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .radar-sweep { animation: none; opacity: .5; }
}