@charset "UTF-8";

:root {
  --bg: #04222e;
  --bg-2: #062b3b;
  --panel: #0a3546;
  --line: #14526d;
  --ink: #eef7fa;
  --muted: #96b6c4;
  --sea: #0b5f8a;
  --sea-deep: #07435f;
  --sand: #f2c14e;
  --foam: #d8eef6;
  --shell: 1160px;
  --header-height: 70px;
  --serif: "Songti SC", "SimSun", Georgia, serif;
}

* { 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;
}
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(--sand); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 0 14px;
  color: var(--sand);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 3px;
  line-height: 1.4;
}
.eyebrow::before, .eyebrow::after { width: 18px; height: 1px; content: ""; background: currentColor; opacity: .6; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(4, 34, 46, .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: 21px; font-weight: 900; letter-spacing: -.4px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 50%; object-fit: contain; background: #082c3c; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--sand);
  color: #16323c;
  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: #a9c4d0; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--sand); 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(--sand);
  border-radius: 999px;
  background: var(--sand);
  color: #12303b;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--sand); }
.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: 50%; 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: css island silhouette + centered copy */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(620px 360px at 50% 8%, rgba(242, 193, 78, .16), transparent 68%),
    linear-gradient(180deg, #063546 0%, #052936 62%, #04222e 100%);
}
.hero::before {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 168px;
  content: "";
  background:
    radial-gradient(60% 70% at 40% 20%, rgba(96, 184, 214, .28), transparent 70%),
    linear-gradient(180deg, #0b5f8a, #07435f 88%);
  border-top: 3px solid rgba(242, 193, 78, .5);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  pointer-events: none;
}
.hero::after {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 26%;
  content: "";
  background-image: repeating-linear-gradient(180deg, rgba(216, 238, 246, .12) 0 1px, transparent 1px 15px);
  mask-image: linear-gradient(180deg, transparent, #000 70%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 2; padding: 78px 0 0; text-align: center; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: #a9c8d4;
  font-size: 11px;
  letter-spacing: 2.4px;
}
.hero-kicker b {
  padding: 3px 9px;
  border: 1px solid rgba(242, 193, 78, .5);
  border-radius: 3px;
  color: var(--sand);
  font-size: 9.5px;
  font-weight: 900;
  letter-spacing: 1.6px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(62px, 10vw, 134px);
  font-weight: 900;
  letter-spacing: clamp(2px, .5vw, 6px);
  line-height: 1;
  text-shadow: 0 18px 40px rgba(0, 0, 0, .35);
}
.hero-subtitle { margin: 22px 0 0; color: var(--sand); font-size: clamp(17px, 1.8vw, 22px); font-weight: 800; }
.hero-lead { max-width: 620px; margin: 14px auto 0; color: #b3ccd7; font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 20px; margin-top: 30px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 14px;
  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(--sand); color: #122f39; box-shadow: 0 14px 30px rgba(242, 193, 78, .22); }
.button-primary:hover { background: #ffd470; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 34px; font-size: 15px; }
.text-link { color: #cfe3ea; border-bottom: 1px dashed #3f7086; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--sand); }

.island-stats {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  max-width: 760px;
  margin: 52px auto 40px;
  padding: 0;
  border: 1px solid rgba(242, 193, 78, .28);
  border-radius: 8px;
  background: rgba(242, 193, 78, .18);
  list-style: none;
  overflow: hidden;
  backdrop-filter: blur(6px);
}
.island-stats li { padding: 14px 8px 13px; background: rgba(4, 34, 46, .76); }
.island-stats b { display: block; color: var(--sand); font-size: 19px; font-weight: 900; line-height: 1.3; letter-spacing: .5px; }
.island-stats span { display: block; margin-top: 2px; color: #9dbcc9; font-size: 11px; }

/* features: two-by-two horizontal cards */
.features { padding: 76px 0 80px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 32px; text-align: center; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(25px, 2.8vw, 35px); font-weight: 900; letter-spacing: -.6px; line-height: 1.3; }
.section-heading > p:last-child { max-width: 620px; margin: 12px auto 0; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.feature-card {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 24px 24px 22px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: linear-gradient(120deg, rgba(242, 193, 78, .07), transparent 44%), var(--panel);
}
.feature-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(242, 193, 78, .45);
  border-radius: 50%;
  color: var(--sand);
  font-size: 14px;
  font-weight: 800;
}
.feature-card h3 { margin: 0 0 6px; font-size: 17px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* shots: one big + three small */
.shots { padding: 76px 0 82px; }
.sample-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; align-items: start; }
.sample-card {
  position: relative;
  margin: 0;
  padding: 8px 8px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  overflow: hidden;
}
.sample-card-lead { grid-column: span 2; border-color: rgba(242, 193, 78, .45); }
.sample-card img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; object-position: center 20%; border-radius: 5px; }
.sample-card-lead img { aspect-ratio: 3 / 4; object-position: center 28%; }
.sample-card figcaption { padding: 10px 4px 12px; }
.sample-card figcaption b { display: block; color: var(--sand); font-size: 10px; letter-spacing: 1px; }
.sample-card figcaption span { display: block; font-size: 13px; font-weight: 800; line-height: 1.4; }
.sample-card figcaption small { display: block; color: var(--muted); font-size: 10.5px; font-weight: 500; }

/* faq: numbered full-width accordion */
.faq { padding: 74px 0 80px; border-top: 1px solid var(--line); background: var(--bg-2); }
.faq-list { max-width: 900px; margin: 0 auto; counter-reset: faq; }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:first-child { border-top: 1px solid var(--line); }
.faq-list summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 2px;
  cursor: pointer;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before {
  flex: none;
  width: 34px;
  color: var(--sand);
  font-size: 12px;
  font-weight: 800;
  content: "0" counter(faq);
  counter-increment: faq;
  opacity: .75;
}
.faq-list summary h3 { flex: 1 1 auto; min-width: 0; margin: 0; font-size: 16px; font-weight: 900; }
.faq-list summary i { position: relative; flex: none; width: 26px; height: 26px; border: 1px solid var(--line); border-radius: 50%; }
.faq-list summary i::before,
.faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 1.5px;
  content: "";
  background: var(--sand);
  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 44px 20px 52px; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.9; }

/* reviews: three columns */
.reviews { padding: 76px 0 82px; }
.review-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.review-card {
  position: relative;
  padding: 44px 20px 20px;
  border: 1px solid var(--line);
  border-radius: 4px 4px 12px 12px;
  background: linear-gradient(180deg, rgba(242, 193, 78, .12), rgba(10, 53, 70, .9) 32%), var(--panel);
}
.review-card::before {
  position: absolute;
  top: 14px;
  left: 20px;
  width: 22px;
  height: 5px;
  border-radius: 3px;
  background: rgba(242, 193, 78, .5);
  content: "";
}
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 5px; padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px dashed var(--line); }
.review-meta b { color: var(--sand); font-size: 13px; font-weight: 900; }
.review-meta time { color: #7899a8; font-size: 10px; }
.review-card p { margin: 0; color: #b9d2dc; font-size: 13px; line-height: 1.8; }

/* steps: vertical rail */
.steps { padding: 72px 0 78px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-list { max-width: 760px; padding: 0; margin: 0 auto; list-style: none; }
.step-list li {
  position: relative;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 18px;
  padding: 4px 0 26px 0;
}
.step-list li::before {
  position: absolute;
  top: 30px;
  bottom: 0;
  left: 21px;
  width: 1px;
  content: "";
  background: linear-gradient(180deg, var(--line), transparent);
}
.step-list li:last-child::before { display: none; }
.step-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(242, 193, 78, .45);
  border-radius: 50%;
  background: var(--bg-2);
  color: var(--sand);
  font-size: 13px;
  font-weight: 800;
}
.step-list h3 { margin: 8px 0 5px; font-size: 17px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* download: copy left, button right */
.download { padding: 26px 0; }
.download-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
  align-items: center;
  gap: 24px 40px;
  padding: 46px clamp(24px, 4vw, 52px);
  border-radius: 12px;
  background:
    radial-gradient(320px 200px at 92% 0%, rgba(216, 238, 246, .22), transparent 70%),
    linear-gradient(120deg, #0b5f8a, #084a6b 62%, #073a52);
  overflow: hidden;
}
.download .eyebrow { justify-content: flex-start; color: var(--sand); }
.download h2 { color: #fff; }
.download-copy > p:last-child { margin: 12px 0 0; color: #c8e0ea; font-size: 13.5px; }
.download-side { text-align: right; }
.download-side .button { width: 100%; background: var(--sand); color: #122f39; }
.download-notes { display: flex; flex-direction: column; gap: 6px; padding: 0; margin: 16px 0 0; list-style: none; }
.download-notes li { color: #c3dbe5; font-size: 11.5px; }
.download-notes li::before { margin-right: 7px; content: "·"; color: var(--sand); }

/* footer */
.site-footer { padding: 42px 0 52px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px 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: #aecad5; font-size: 12px; }
.footer-nav a:hover { color: var(--sand); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 22px; padding-top: 18px; 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: #7593a1; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1024px) {
  .sample-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .sample-card-lead { grid-column: span 2; }
}
@media (max-width: 960px) {
  .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); }
  .hero-inner { padding-top: 54px; }
  .feature-grid { grid-template-columns: 1fr; }
  .review-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .download-inner { grid-template-columns: 1fr; }
  .download-side { text-align: left; }
  .download-notes { flex-direction: row; flex-wrap: wrap; gap: 6px 18px; }
}
@media (max-width: 640px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero h1 { font-size: clamp(46px, 15vw, 64px); letter-spacing: 1px; }
  .hero-lead { font-size: 14px; }
  .island-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 38px auto 34px; }
  .island-stats b { font-size: 17px; }
  .sample-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .sample-card-lead { grid-column: span 2; }
  .sample-card img { aspect-ratio: 4 / 5; }
  .sample-card figcaption span { font-size: 12px; }
  .faq-list details p { padding: 0 12px 18px 50px; }
  .review-list { grid-template-columns: 1fr; }
  .step-list li { grid-template-columns: 52px minmax(0, 1fr); gap: 14px; }
  .step-list li::before { left: 21px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 430px) {
  .nav-shell { gap: 8px; }
  .brand { font-size: 17px; gap: 7px; }
  .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: 46px; }
  .button { width: 100%; }
  .island-stats b { font-size: 15px; }
  .faq-list summary h3 { font-size: 14.5px; }
}