@charset "UTF-8";

:root {
  --bg: #041C2C;
  --bg-2: #072A40;
  --panel: #0A3653;
  --panel-2: #0C3F60;
  --line: #13567C;
  --ink: #E8F5FD;
  --muted: #97BBD2;
  --sky: #0EA5E9;
  --deep: #082F49;
  --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(--sky); 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(--sky);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.4px;
  line-height: 1.4;
}
.eyebrow::before { width: 18px; height: 2px; content: ""; background: currentColor; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(4, 28, 44, .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: .3px; }
.brand img { width: 38px; height: 38px; border-radius: 11px; object-fit: contain; background: #1B1550; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 6px 6px 6px 0;
  background: var(--sky);
  color: #04222F;
  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; color: #A8C9DD; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { color: #fff; border-bottom: 2px solid var(--sky); }
.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(--sky);
  border-radius: 8px;
  background: var(--sky);
  color: #04222F;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--sky); }
.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 */
.hero {
  position: relative;
  overflow: hidden;
  padding: 62px 0 250px;
  background:
    radial-gradient(700px 420px at 78% -6%, rgba(14, 165, 233, .3), transparent 66%),
    linear-gradient(180deg, #0A3E5C 0%, #062B43 54%, #041F31 100%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image:
    radial-gradient(1.5px 1.5px at 18% 22%, rgba(232, 245, 253, .75), transparent),
    radial-gradient(1.2px 1.2px at 72% 14%, rgba(232, 245, 253, .6), transparent),
    radial-gradient(1.6px 1.6px at 46% 8%, rgba(232, 245, 253, .5), transparent),
    radial-gradient(1.2px 1.2px at 88% 34%, rgba(232, 245, 253, .55), transparent);
  pointer-events: none;
}
.hero-copy { position: relative; z-index: 4; max-width: 800px; margin: 0 auto; text-align: center; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: #B7D6E7;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.6px;
}
.hero-kicker b {
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--sky);
  color: #04222F;
  font-size: 9.5px;
  font-weight: 900;
  letter-spacing: 1.6px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(52px, 7.6vw, 100px);
  font-weight: 900;
  letter-spacing: clamp(-1px, -.3vw, -3px);
  line-height: 1;
  text-shadow: 0 20px 50px rgba(0, 0, 0, .35);
}
.hero-subtitle {
  margin: 16px 0 0;
  color: #7DD3FC;
  font-size: clamp(18px, 2.1vw, 24px);
  font-weight: 800;
  line-height: 1.4;
}
.hero-lead { max-width: 620px; margin: 14px auto 0; color: #B7D6E7; font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 20px; margin-top: 26px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 14px;
  padding: 0 30px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--sky); color: #04222F; box-shadow: 0 16px 32px rgba(14, 165, 233, .28); }
.button-primary:hover { background: #38BDF8; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 34px; font-size: 15px; }
.text-link { color: #CFE7F4; border-bottom: 1px dashed #2C7096; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: #7DD3FC; }

.isle-badge {
  position: absolute;
  z-index: 5;
  top: 26px;
  right: max(20px, calc((100% - var(--shell)) / 2));
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid rgba(125, 211, 252, .5);
  border-radius: 999px;
  background: rgba(4, 28, 44, .72);
  backdrop-filter: blur(8px);
  color: #CFE7F4;
  font-size: 11px;
}
.isle-badge span { letter-spacing: 1px; }
.isle-badge b { color: #7DD3FC; font-family: var(--mono); font-size: 15px; letter-spacing: .5px; }
.isle-badge small { font-size: 10px; }

.hero-isle {
  position: absolute;
  z-index: 5;
  bottom: 46px;
  left: 50%;
  width: 340px;
  height: 180px;
  transform: translateX(-50%);
  pointer-events: none;
}
.isle-shape {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 300px;
  height: 100px;
  border-radius: 50% 50% 12% 12% / 92% 92% 8% 8%;
  background: linear-gradient(180deg, #1B5C7A, #0B3147 66%, #082333);
  transform: translateX(-50%);
  box-shadow: 0 -10px 34px rgba(56, 189, 248, .22), 0 24px 40px rgba(0, 0, 0, .4);
}
.isle-shape::after {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 360px;
  height: 14px;
  border-radius: 50%;
  content: "";
  background: rgba(6, 28, 42, .55);
  transform: translateX(-50%);
}
.isle-small {
  position: absolute;
  right: 4px;
  bottom: 8px;
  width: 118px;
  height: 58px;
  border-radius: 50% 50% 12% 12% / 92% 92% 8% 8%;
  background: linear-gradient(180deg, #12455E, #092A3D 70%, #071F2E);
  opacity: .92;
}

.hero-wave {
  position: absolute;
  left: -12%;
  width: 124%;
  border-radius: 46% 46% 0 0 / 100% 100% 0 0;
  pointer-events: none;
}
.wave-back { z-index: 3; bottom: -34px; height: 158px; background: linear-gradient(180deg, rgba(56, 189, 248, .38), rgba(14, 165, 233, .16)); transform: rotate(-2.5deg); }
.wave-mid { z-index: 4; bottom: -62px; height: 168px; background: linear-gradient(180deg, #0E4C6B, #0A3A54); transform: rotate(2.2deg); }
.wave-front { z-index: 6; bottom: -92px; height: 176px; background: var(--bg); }
.hero-sand { display: none; }

/* features */
.features { padding: 74px 0 78px; border-top: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(24px, 2.7vw, 34px); 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: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(200px, 280px); align-items: end; gap: 26px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-grid { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr); grid-auto-rows: 1fr; gap: 14px; }
.feature-card {
  padding: 24px 24px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
}
.feature-main {
  grid-row: span 3;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 34px 30px;
  background:
    radial-gradient(320px 220px at 100% 0%, rgba(14, 165, 233, .28), transparent 68%),
    linear-gradient(150deg, #0C4463, var(--panel) 74%);
  border-color: #1E6C96;
}
.feature-no { display: block; margin-bottom: 9px; color: #7DD3FC; font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1.6px; }
.feature-card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 900; }
.feature-main h3 { font-size: clamp(21px, 2.2vw, 26px); }
.feature-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.feature-main p { font-size: 13.5px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 18px 0 0; list-style: none; }
.card-tags li { padding: 5px 11px; border: 1px solid rgba(125, 211, 252, .38); border-radius: 999px; color: #BFE3F5; font-size: 11px; }

/* shots */
.shots { padding: 72px 0 78px; }
.shot-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.shot-card { display: grid; grid-template-columns: 200px minmax(0, 1fr); align-items: stretch; margin: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); overflow: hidden; }
.shot-card img { width: 100%; height: auto; aspect-ratio: 9 / 16; object-fit: cover; object-position: top center; }
.shot-card figcaption { display: flex; flex-direction: column; justify-content: center; gap: 4px; padding: 20px 22px; border-left: 1px solid var(--line); }
.shot-card figcaption b { color: rgba(125, 211, 252, .55); font-family: var(--mono); font-size: 26px; font-weight: 700; letter-spacing: 1.5px; line-height: 1; }
.shot-card figcaption span { margin-top: 10px; font-size: 17px; font-weight: 900; line-height: 1.35; }
.shot-card figcaption small { color: var(--muted); font-size: 12px; 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, .82fr) minmax(0, 1.18fr); gap: clamp(24px, 3.6vw, 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: 16px 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: 24px; height: 24px; border: 1px solid var(--line); border-radius: 6px; }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 9px; height: 1.5px; content: ""; background: #7DD3FC; 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 16px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews */
.reviews { padding: 72px 0 78px; }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 18px 20px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.review-meta { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 10px; margin-bottom: 6px; padding-bottom: 6px; border-bottom: 1px dashed rgba(19, 86, 124, .8); }
.review-meta b { color: #7DD3FC; font-size: 13.5px; font-weight: 900; }
.review-meta time { color: #7FA5BC; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #C2DCEB; font-size: 13.5px; line-height: 1.75; }

/* steps */
.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: 14px; padding: 0; margin: 0; list-style: none; counter-reset: step; }
.step-list li {
  position: relative;
  padding: 26px 22px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(14, 165, 233, .12), transparent 62%), var(--panel);
}
.step-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 9px;
  background: rgba(14, 165, 233, .18);
  color: #7DD3FC;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
}
.step-list h3 { margin: 0 0 6px; font-size: 17px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

/* download */
.download { padding: 24px 0 42px; }
.download-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(24px, 4vw, 54px);
  padding: 44px clamp(24px, 4.4vw, 56px);
  border: 1px solid #1E6C96;
  border-radius: 16px;
  background:
    radial-gradient(360px 240px at 8% 110%, rgba(14, 165, 233, .3), transparent 70%),
    linear-gradient(110deg, #0B3E5B, #072B42 76%);
}
.download-cta .button { white-space: nowrap; }
.download-copy .eyebrow { margin-bottom: 10px; }
.download h2 { max-width: 560px; }
.download-copy > p { max-width: 520px; margin: 12px 0 0; color: var(--muted); font-size: 13.5px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 18px; padding: 16px 0 0; margin: 16px 0 0; border-top: 1px solid rgba(125, 211, 252, .2); list-style: none; }
.download-notes li { color: #A8C9DD; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 7px; content: "~"; color: #7DD3FC; }

/* 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: #A8C9DD; font-size: 12px; }
.footer-nav a:hover { color: #7DD3FC; }
.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: #7FA5BC; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero { padding: 52px 0 232px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-main { grid-row: auto; }
  .shot-card { grid-template-columns: 150px minmax(0, 1fr); }
  .isle-badge { top: 18px; }
}
@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; }
  .review-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; }
  .download-inner { grid-template-columns: 1fr; }
  .download-cta { order: 2; }
  .download-copy { order: 1; }
}
@media (max-width: 768px) {
  .hero { padding: 44px 0 218px; }
  .hero-isle { width: 290px; height: 156px; bottom: 38px; }
  .isle-shape { width: 250px; height: 84px; }
  .section-heading-split { grid-template-columns: 1fr; gap: 10px; }
  .section-heading-split > p:last-child { margin: 0; }
  .shot-grid { grid-template-columns: 1fr; }
  .shot-card { grid-template-columns: 124px minmax(0, 1fr); }
  .isle-badge { position: static; width: fit-content; margin: 0 auto 18px; }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero h1 { font-size: clamp(44px, 13.4vw, 60px); }
  .hero-lead { font-size: 14px; }
  .hero { padding: 34px 0 200px; }
  .hero-isle { bottom: 28px; transform: translateX(-50%) scale(.86); }
  .feature-main { padding: 26px 22px; }
  .review-card { padding: 16px 17px; }
  .footer-grid { grid-template-columns: 1fr; }
  .button { width: 100%; }
  .hero-actions { gap: 14px; }
  .text-link { width: 100%; text-align: center; }
}
@media (max-width: 380px) {
  .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: 42px; }
  .hero-subtitle { font-size: 16px; }
  .isle-badge { padding: 8px 12px; }
}