@charset "UTF-8";

:root {
  --bg: #0B2226;
  --bg-2: #0F2B30;
  --panel: #12343A;
  --line: #1E4A50;
  --ink: #EAF6F5;
  --muted: #8FB3B3;
  --mint: #5EEAD4;
  --mint-deep: #2BB8A2;
  --coral: #FF8A76;
  --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%; height: auto; }
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(--mint); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 46px), var(--shell)); margin: 0 auto; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 13px; color: var(--mint); font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: 2.4px; }
.eyebrow::before { width: 5px; height: 5px; border-radius: 50%; content: ""; background: currentColor; box-shadow: 8px 0 0 rgba(94, 234, 212, .4); }

/* header */
.site-header { position: sticky; top: 0; z-index: 60; border-bottom: 1px solid var(--line); background: rgba(11, 34, 38, .96); backdrop-filter: blur(12px); }
.nav-shell { display: flex; align-items: center; justify-content: space-between; width: min(calc(100% - 46px), var(--shell)); min-height: var(--header-height); margin: 0 auto; gap: 18px; }
.brand { display: inline-flex; align-items: center; flex: none; gap: 9px; font-size: 20px; font-weight: 900; letter-spacing: 1px; }
.brand img { width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 10px; object-fit: contain; background: #082024; }
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(11px, 1.7vw, 24px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; color: #9EBFBF; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { color: var(--mint); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download { display: inline-flex; align-items: center; justify-content: center; min-height: 41px; gap: 7px; padding: 0 15px; border-radius: 21px; background: var(--mint); color: #05231F; font-size: 12.5px; font-weight: 900; white-space: nowrap; transition: background .18s ease; }
.nav-download:hover { background: #8FF5E5; }
.nav-download svg, .button svg { width: 17px; height: 17px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 41px; height: 41px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 17px; 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; border-bottom: 1px solid var(--line); background:
  radial-gradient(620px 380px at 88% 4%, rgba(94, 234, 212, .12), transparent 70%),
  linear-gradient(170deg, #0F2E33, var(--bg) 70%); }
.hero::before { position: absolute; inset: 0; content: ""; background-image: radial-gradient(rgba(94, 234, 212, .16) 1px, transparent 1px); background-size: 26px 26px; opacity: .4; pointer-events: none; }
.hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(0, .92fr); align-items: center; gap: clamp(26px, 4vw, 56px); padding: 60px 0 66px; }
.hero-copy { min-width: 0; }
.hero-kicker { display: inline-flex; align-items: center; gap: 9px; padding: 4px 12px 4px 5px; margin: 0 0 18px; border: 1px solid #26615F; border-radius: 20px; color: #A9CFCB; font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px; }
.hero-kicker b { padding: 2px 8px; border-radius: 12px; background: rgba(94, 234, 212, .16); color: var(--mint); font-size: 9.5px; }
.hero h1 { margin: 0; font-size: clamp(46px, 6.4vw, 80px); font-weight: 900; letter-spacing: clamp(-1px, -.25vw, -1.5px); line-height: 1.02; }
.hero-subtitle { margin: 16px 0 0; color: var(--mint); font-size: clamp(17px, 2vw, 22px); font-weight: 800; }
.hero-lead { max-width: 520px; margin: 14px 0 0; color: var(--muted); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; margin-top: 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; gap: 12px; padding: 0 26px; border: 1px solid transparent; border-radius: 26px; font-size: 14px; font-weight: 900; transition: transform .18s ease, background .18s ease; }
.button-primary { background: var(--mint); color: #05231F; box-shadow: 0 16px 30px rgba(94, 234, 212, .2); }
.button-primary:hover { background: #8FF5E5; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #B9D6D3; border-bottom: 1px dashed #3B6F6B; font-size: 13px; font-weight: 700; }
.text-link span { margin-left: 4px; color: var(--mint); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 28px 0 0; list-style: none; }
.hero-tags li { padding: 5px 12px; border: 1px solid #2A5D5B; border-radius: 20px; color: #A2C4C1; font-size: 11.5px; }
.hero-tags b { margin-right: 4px; color: var(--ink); font-family: var(--mono); font-size: 12.5px; }

/* room panel */
.room { min-width: 0; padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: linear-gradient(165deg, #143B41, #0E282D); box-shadow: 0 26px 50px rgba(0, 0, 0, .4); }
.room-head { display: flex; align-items: center; gap: 9px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.room-head .live { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 3px rgba(94, 234, 212, .16); }
.room-head p { flex: 1; min-width: 0; margin: 0; color: #C4DEDC; font-family: var(--mono); font-size: 11.5px; letter-spacing: .6px; }
.room-head b { padding: 2px 8px; border-radius: 10px; background: rgba(255, 138, 118, .16); color: var(--coral); font-size: 10.5px; }
.pair { display: grid; grid-template-columns: minmax(0, 1fr) 56px minmax(0, 1fr); align-items: center; gap: 4px; padding: 16px 0 12px; }
.device { min-width: 0; text-align: center; }
.who { display: block; margin-bottom: 5px; color: #9EBFBF; font-size: 10.5px; }
.screen-mini { position: relative; display: flex; align-items: flex-end; justify-content: center; height: 86px; border: 1px solid #2E6864; border-radius: 8px; background: linear-gradient(160deg, #1B5054, #103234); overflow: hidden; }
.screen-mini i { position: absolute; top: 0; left: 0; right: 0; height: 62%; background: linear-gradient(180deg, rgba(94, 234, 212, .16), transparent); }
.screen-mini em { position: relative; padding: 2px 7px; margin-bottom: 6px; border-radius: 9px; background: rgba(5, 35, 31, .7); color: var(--mint); font-family: var(--mono); font-size: 9.5px; font-style: normal; }
.sync-wire { position: relative; height: 1px; border-top: 1px dashed #3E7A74; }
.sync-wire span { position: absolute; top: -15px; left: 50%; padding: 4px 0; width: 62px; border-radius: 10px; background: rgba(94, 234, 212, .14); color: var(--mint); font-size: 9px; text-align: center; transform: translateX(-50%); }
.room-log { padding: 8px 0 0; margin: 0; border-top: 1px solid var(--line); list-style: none; }
.room-log li { display: flex; gap: 10px; padding: 5px 0; color: #86AAA8; font-size: 11px; }
.room-log b { flex: none; color: #5E8A87; font-family: var(--mono); font-size: 10px; font-weight: 400; }
.room-foot { display: flex; justify-content: space-between; padding-top: 10px; margin-top: 5px; border-top: 1px solid var(--line); color: #5E8A87; font-family: var(--mono); font-size: 10px; }

/* features */
.features { padding: 74px 0 78px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 30px; }
.section-heading h2 { margin: 0; font-size: clamp(23px, 2.6vw, 32px); font-weight: 900; letter-spacing: -.4px; line-height: 1.36; }
.section-heading > p:last-child { max-width: 640px; margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, 280px); align-items: end; gap: 22px; }
.section-heading-split > p:last-child { margin: 0 0 6px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.feature-item { position: relative; min-width: 0; padding: 24px 26px 26px 30px; border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(160deg, #14383E, #102A2F); }
.feature-item::before { position: absolute; top: 24px; bottom: 26px; left: 0; width: 2px; content: ""; background: var(--mint); opacity: .8; }
.feature-item .num { position: absolute; top: 16px; right: 20px; color: rgba(94, 234, 212, .18); font-family: var(--mono); font-size: 32px; font-weight: 700; line-height: 1; }
.feature-item h3 { margin: 0 0 8px; font-size: 17.5px; font-weight: 900; }
.feature-item p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* shots: phone frames */
.shots { padding: 74px 0 84px; }
.phone-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.phone { min-width: 0; margin: 0; }
.phone-shell { position: relative; padding: 8px; border: 1px solid #2A5D5B; border-radius: 20px; background: #0A2226; box-shadow: 0 18px 36px rgba(0, 0, 0, .34); }
.phone-shell::before { position: absolute; top: 12px; left: 50%; z-index: 2; width: 34px; height: 5px; border-radius: 3px; content: ""; background: #06191C; transform: translateX(-50%); }
.phone-shell img { width: 100%; height: auto; aspect-ratio: 9 / 16; border-radius: 14px; object-fit: cover; }
.phone figcaption { display: flex; align-items: baseline; gap: 9px; padding: 11px 2px 0; }
.phone figcaption b { color: var(--mint); font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px; }
.phone figcaption span { font-size: 13.5px; font-weight: 900; }
.phone figcaption small { display: block; color: var(--muted); font-size: 11px; font-weight: 400; line-height: 1.6; }

/* faq */
.faq { padding: 74px 0 78px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-2); }
.faq-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; align-items: start; }
.faq-grid details { min-width: 0; padding: 0 18px; border: 1px solid var(--line); border-top: 2px solid #2E6864; border-radius: 4px 4px 10px 10px; background: var(--panel); }
.faq-grid details[open] { border-top-color: var(--mint); }
.faq-grid summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 15px 0; cursor: pointer; list-style: none; }
.faq-grid summary::-webkit-details-marker { display: none; }
.faq-grid h3 { margin: 0; font-size: 14.5px; font-weight: 900; line-height: 1.5; }
.faq-grid summary i { position: relative; width: 18px; height: 18px; flex: none; border-radius: 50%; background: rgba(94, 234, 212, .12); }
.faq-grid summary i::before, .faq-grid summary i::after { position: absolute; top: 50%; left: 50%; width: 7px; height: 1.5px; content: ""; background: var(--mint); transform: translate(-50%, -50%); }
.faq-grid summary i::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-grid details[open] summary i::after { transform: translate(-50%, -50%) rotate(0deg); }
.faq-grid details p { padding: 13px 0 16px; margin: 0; border-top: 1px dashed #2A5D5B; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* reviews */
.reviews { padding: 74px 0 80px; }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.review-card { display: flex; gap: 13px; min-width: 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: rgba(18, 52, 58, .72); }
.avatar { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; flex: none; border-radius: 50%; background: linear-gradient(150deg, rgba(94, 234, 212, .3), rgba(94, 234, 212, .1)); color: var(--mint); font-size: 13px; font-weight: 900; }
.review-body { min-width: 0; }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 4px 10px; margin-bottom: 5px; }
.review-meta b { font-size: 13px; font-weight: 900; }
.review-meta time { color: #6E9895; font-family: var(--mono); font-size: 9.5px; }
.review-body p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.85; }

/* steps: rows */
.steps { padding: 74px 0 80px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-2); }
.step-list { padding: 0; margin: 0; list-style: none; }
.step-list li { display: grid; grid-template-columns: 54px minmax(0, 1fr); align-items: start; gap: 18px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.step-list li + li { margin-top: 10px; }
.step-list li > span { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 50%; background: rgba(94, 234, 212, .12); color: var(--mint); font-family: var(--mono); font-size: 14px; font-weight: 700; }
.step-list h3 { margin: 3px 0 4px; font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* download */
.download { padding: 62px 0 68px; }
.download-inner { position: relative; padding: 34px 34px 30px; border: 1px solid #2E6864; border-radius: 18px; background: linear-gradient(150deg, #17454B, #103034); overflow: hidden; }
.download-inner::before { position: absolute; top: -40px; right: -30px; width: 180px; height: 180px; border-radius: 50%; content: ""; background: radial-gradient(circle, rgba(94, 234, 212, .2), transparent 66%); }
.download-inner h2 { margin: 0; font-size: clamp(22px, 2.5vw, 31px); font-weight: 900; line-height: 1.36; }
.download-inner > p:nth-of-type(2) { margin: 10px 0 22px; color: var(--muted); font-size: 13.5px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 10px; padding: 0; margin: 16px 0 0; list-style: none; }
.download-notes li { padding: 4px 11px; border: 1px solid #2E6864; border-radius: 14px; color: #A6C8C4; font-size: 11.5px; }

/* footer */
.site-footer { padding: 44px 0 32px; border-top: 1px solid var(--line); background: #081C20; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.2fr) minmax(0, 1fr); gap: 22px; align-items: start; }
.footer-brand strong { display: block; margin-bottom: 6px; font-size: 15px; font-weight: 900; }
.footer-brand p { margin: 0; color: #6E9895; font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 12.5px; }
.footer-nav a { color: #A6C8C4; }
.footer-nav a:hover { color: var(--mint); }
.footer-meta { font-size: 12px; color: #6E9895; text-align: right; }
.footer-meta p { margin: 0 0 6px; }
.footer-meta a { color: #A6C8C4; }
.disclaimer { grid-column: 1 / -1; padding-top: 16px; margin: 4px 0 0; border-top: 1px solid #1B4247; color: #5F8582; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; padding: 46px 0 50px; }
  .room { max-width: 520px; }
  .phone-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .faq-grid, .review-list { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-meta { text-align: left; }
}
@media (max-width: 860px) {
  .primary-nav { position: absolute; top: 100%; left: 0; right: 0; display: none; margin: 0; padding: 8px 22px 16px; border-bottom: 1px solid var(--line); background: #0A2429; }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 11px 0; border-bottom: 1px solid #1B4247; font-size: 14px; }
  .menu-toggle { display: block; }
  .section-heading-split { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .brand { font-size: 17px; }
  .hero h1 { font-size: 36px; }
  .hero-subtitle { font-size: 16px; }
  .hero-lead { font-size: 13.5px; }
  .pair { grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1fr); }
  .phone-grid { gap: 12px; }
  .step-list li { grid-template-columns: 40px minmax(0, 1fr); gap: 13px; padding: 15px; }
  .step-list li > span { width: 38px; height: 38px; font-size: 12.5px; }
  .footer-grid { grid-template-columns: 1fr; }
  .button, .button-large { width: 100%; }
  .text-link { display: none; }
  .download-inner { padding: 24px 20px; }
  .phone figcaption { flex-wrap: wrap; gap: 3px 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}