:root {
  --deep: #0C2B2B;
  --deep-2: #113A3A;
  --deep-3: #0A2423;
  --sand: #F2E3C4;
  --mint: #35D6C4;
  --muted: #9CBDB6;
  --line: rgba(53, 214, 196, 0.18);
  --line-soft: rgba(242, 227, 196, 0.12);
  --shell: 1150px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--deep);
  background-image:
    linear-gradient(rgba(53, 214, 196, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 214, 196, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--sand);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { margin: 0; line-height: 1.3; font-weight: 700; }

.page-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(12, 43, 43, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 6px;
  border: 1px solid var(--line);
  object-fit: cover;
}

.primary-nav { margin-left: auto; }

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
  color: var(--muted);
}

.primary-nav a {
  display: inline-block;
  padding: 4px 0;
  transition: color 0.2s ease;
}

.primary-nav a:hover { color: var(--mint); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: 4px;
  background: transparent;
  border: 1px solid var(--mint);
  color: var(--mint);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-download svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-download:hover {
  background: var(--mint);
  color: #08201F;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--deep-2);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 3px auto;
  border-radius: 1px;
  background: var(--sand);
}

/* ---------- hero ---------- */
.hero {
  padding: 54px 0 50px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  gap: 46px;
  align-items: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mint);
}

.hero-kicker::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--mint);
}

.hero h1 {
  margin: 14px 0 10px;
  font-size: clamp(38px, 5.2vw, 62px);
  letter-spacing: 0.06em;
  font-weight: 800;
}

.hero-subtitle {
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.02em;
}

.hero-lead {
  margin-top: 16px;
  max-width: 470px;
  font-size: 15.2px;
  color: var(--muted);
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 700;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-primary {
  background: var(--mint);
  color: #08201F;
  border: 1px solid var(--mint);
  box-shadow: 0 16px 30px rgba(53, 214, 196, 0.18);
}

.button-primary:hover {
  background: #5EE6D6;
  border-color: #5EE6D6;
}

.button-large { padding: 14px 26px; font-size: 16px; }

.text-link {
  font-size: 14px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

.text-link:hover { color: var(--mint); }

.hero-tags {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
}

.hero-tags li {
  padding: 3px 10px;
  border: 1px dashed var(--line);
  border-radius: 3px;
}

.hero-tags b { color: var(--mint); font-weight: 700; }

/* ---------- hero radar ---------- */
.radar-scan {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(170deg, rgba(53, 214, 196, 0.09), rgba(12, 43, 43, 0.5) 60%);
}

.radar-stage {
  position: relative;
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(53, 214, 196, 0.4);
  background: radial-gradient(circle at 50% 50%, rgba(53, 214, 196, 0.14), rgba(12, 43, 43, 0.1) 62%);
  overflow: hidden;
}

.radar-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed rgba(53, 214, 196, 0.24);
}

.ring-one { inset: 14%; }
.ring-two { inset: 30%; }
.ring-three { inset: 44%; }

.radar-sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 196deg, rgba(53, 214, 196, 0.5), rgba(53, 214, 196, 0.12) 38deg, rgba(53, 214, 196, 0) 66deg, rgba(53, 214, 196, 0) 360deg);
  animation: radar-breathe 5s ease-in-out infinite;
}

@keyframes radar-breathe {
  0%, 100% { opacity: 0.85; }
  50% { opacity: 0.45; }
}

.radar-dot {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sand);
  border: 1px solid var(--mint);
  animation: radar-ping 3.4s ease-out infinite;
}

.dot-one { left: 60%; top: 25%; }
.dot-two { left: 31%; top: 43%; animation-delay: 0.8s; }
.dot-three { left: 53%; top: 69%; animation-delay: 1.6s; }
.dot-four { left: 22%; top: 65%; animation-delay: 2.4s; }

@keyframes radar-ping {
  0% { box-shadow: 0 0 0 0 rgba(53, 214, 196, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(53, 214, 196, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 214, 196, 0); }
}

.radar-core {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 5px 9px;
  border-radius: 3px;
  background: var(--deep);
  border: 1px solid var(--line);
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mint);
  white-space: nowrap;
}

.radar-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 10px;
  margin-top: 16px;
  font-size: 11.5px;
  color: var(--muted);
}

.radar-legend li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 8px;
  border-left: 2px solid var(--line);
}

.radar-legend b {
  font-weight: 700;
  color: var(--sand);
  font-size: 12px;
}

.radar-foot {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed var(--line);
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- section shared ---------- */
section { padding: 52px 0; }

.section-heading {
  max-width: 660px;
  margin-bottom: 26px;
}

.section-heading .eyebrow {
  display: inline-block;
  margin-bottom: 9px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.section-heading h2 {
  font-size: clamp(23px, 2.7vw, 31px);
  letter-spacing: 0.01em;
}

.section-heading p:last-child {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

.section-heading-split {
  max-width: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
}

.section-heading-split > p {
  margin: 0 0 5px;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
}

/* ---------- features ---------- */
.features {
  background: var(--deep-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.radar-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.radar-grid article {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(12, 43, 43, 0.55);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.radar-grid article:hover {
  border-color: rgba(53, 214, 196, 0.5);
  transform: translateY(-2px);
}

.radar-grid article::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 12px;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--mint);
  border-right: 1px solid var(--mint);
}

.radar-grid span {
  display: inline-block;
  margin-bottom: 9px;
  padding: 1px 7px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mint);
}

.radar-grid h3 {
  font-size: 16.5px;
  margin-bottom: 6px;
}

.radar-grid p {
  font-size: 13.3px;
  color: var(--muted);
}

/* ---------- shots ---------- */
.radar-shots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.radar-shots figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  background: var(--deep-2);
}

.radar-shots img {
  width: 100%;
  height: auto;
  object-fit: cover;
  object-position: top center;
  background: var(--deep-3);
}

.radar-shots figcaption {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 12px 10px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  font-weight: 700;
}

.radar-shots figcaption b {
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10.5px;
  color: var(--mint);
}

.radar-shots figcaption small {
  margin-left: auto;
  font-weight: 400;
  font-size: 10.5px;
  color: var(--muted);
}

.sample-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted);
}

/* ---------- faq ---------- */
.faq {
  background: var(--deep);
  border-top: 1px solid var(--line-soft);
}

.r-faq-list {
  display: grid;
  gap: 7px;
  max-width: 940px;
}

.r-faq-list details {
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  background: rgba(17, 58, 58, 0.55);
  padding: 0 17px;
}

.r-faq-list details[open] {
  border-color: rgba(53, 214, 196, 0.36);
  background: rgba(17, 58, 58, 0.85);
}

.r-faq-list summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  cursor: pointer;
  list-style: none;
}

.r-faq-list summary::-webkit-details-marker { display: none; }

.r-faq-list summary h3 {
  flex: 1;
  font-size: 15px;
  font-weight: 700;
}

.r-faq-list summary i {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.r-faq-list summary i::before,
.r-faq-list summary i::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--mint);
  transform: translate(-50%, -50%);
}

.r-faq-list summary i::before { width: 8px; height: 1px; }
.r-faq-list summary i::after { width: 1px; height: 8px; transition: opacity 0.2s ease; }
.r-faq-list details[open] summary i::after { opacity: 0; }

.r-faq-list details > p {
  padding: 11px 0 15px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.8px;
  color: #C6DCD6;
}

/* ---------- reviews ---------- */
.reviews {
  background: var(--deep-2);
  border-top: 1px solid var(--line);
}

.r-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 11px;
}

.r-notes .review-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 16px 14px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--mint);
  border-radius: 2px;
  background: rgba(12, 43, 43, 0.6);
}

.r-notes .review-card > p {
  font-size: 13.4px;
  color: #D3E5E0;
}

.review-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line-soft);
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10px;
  color: var(--muted);
}

.review-meta b {
  font-family: inherit;
  font-size: 11.5px;
  color: var(--mint);
}

/* ---------- steps ---------- */
.r-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  counter-reset: pick;
}

.r-steps li {
  position: relative;
  padding: 18px 18px 20px 54px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(17, 58, 58, 0.4);
}

.r-steps li::before {
  counter-increment: pick;
  content: "0" counter(pick);
  position: absolute;
  left: 16px;
  top: 18px;
  width: 24px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 20px;
  line-height: 1;
  color: var(--mint);
  opacity: 0.9;
}

.r-steps span {
  display: block;
  margin-bottom: 4px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.r-steps h3 { font-size: 16.5px; }

.r-steps p {
  margin-top: 4px;
  font-size: 13.2px;
  color: var(--muted);
}

/* ---------- download ---------- */
.download { padding-bottom: 62px; }

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 32px;
  border: 1px solid rgba(53, 214, 196, 0.34);
  border-radius: 6px;
  background:
    radial-gradient(420px 240px at 88% 0%, rgba(53, 214, 196, 0.2), transparent 66%),
    var(--deep-2);
}

.download-copy { max-width: 520px; }

.download-copy .eyebrow {
  display: block;
  margin-bottom: 8px;
  font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.download-copy h2 {
  font-size: clamp(23px, 2.6vw, 30px);
  margin-bottom: 8px;
}

.download-copy p {
  font-size: 14.2px;
  color: var(--muted);
}

.download-act {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.download-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 5px 14px;
  font-size: 11.5px;
  color: var(--muted);
}

.download-notes li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.download-notes li::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--mint);
}

/* ---------- footer ---------- */
.site-footer {
  padding: 32px 0 28px;
  background: var(--deep-3);
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 20px 30px;
  align-items: start;
}

.footer-brand strong {
  display: block;
  font-size: 17px;
  color: var(--mint);
  letter-spacing: 0.04em;
}

.footer-brand p {
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--muted);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13px;
  color: var(--muted);
}

.footer-nav a:hover { color: var(--mint); }

.footer-meta {
  font-size: 12.5px;
  color: var(--muted);
  text-align: right;
}

.footer-meta a:hover { color: var(--mint); }

.disclaimer {
  grid-column: 1 / -1;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  line-height: 1.7;
  color: #7E9C96;
}

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 34px; }
  .radar-scan { max-width: 480px; }
  .radar-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .radar-shots { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .r-notes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-meta { text-align: left; }
  .download-panel { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 900px) {
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    display: none;
    background: var(--deep-2);
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 14px;
  }

  .primary-nav.is-open { display: block; }

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    font-size: 15px;
  }

  .primary-nav li { width: 100%; }

  .primary-nav a {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-shell { position: relative; flex-wrap: wrap; }
  .primary-nav { order: 4; flex-basis: 100%; }
  .nav-actions { margin-left: auto; }
  .menu-toggle { display: block; }
  .nav-download span { display: none; }
  .nav-download { padding: 9px 11px; }
}

@media (max-width: 640px) {
  .page-shell, .nav-shell { padding-left: 18px; padding-right: 18px; }
  section { padding: 40px 0; }
  .hero { padding: 38px 0 32px; }
  .radar-grid { grid-template-columns: minmax(0, 1fr); }
  .r-notes { grid-template-columns: minmax(0, 1fr); }
  .r-steps { grid-template-columns: minmax(0, 1fr); }
  .section-heading-split { flex-direction: column; align-items: flex-start; gap: 5px; }
  .section-heading-split > p { white-space: normal; }
  .download-panel { padding: 24px 18px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .download-act { width: 100%; }
  .download-act .button { width: 100%; justify-content: center; }
}

@media (max-width: 400px) {
  .radar-shots { grid-template-columns: minmax(0, 1fr); }
  .brand span { font-size: 15px; }
  .hero h1 { font-size: 34px; letter-spacing: 0.04em; }
  .radar-scan { padding: 14px; }
  .radar-legend { font-size: 11px; }
}