@charset "UTF-8";

:root {
  --bg: #0B1214;
  --bg-2: #101A1D;
  --panel: #152125;
  --panel-2: #1A292E;
  --text: #E8F3EF;
  --muted: #93A8A3;
  --green: #2FE0A8;
  --green-deep: #178F6A;
  --line: #24363A;
  --shell: 1150px;
  --header-height: 68px;
  --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(--text);
  background: var(--bg);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  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(--green); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 13px; color: var(--green); font-family: var(--mono); font-size: 10.5px; font-weight: 700; letter-spacing: 2.2px; line-height: 1.4; }
.eyebrow::before { width: 16px; height: 1px; content: ""; background: var(--green); }

/* header */
.site-header { position: sticky; top: 0; z-index: 60; border-bottom: 1px solid var(--line); background: rgba(11, 18, 20, .94); backdrop-filter: blur(10px); }
.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: 18px; }
.brand { display: inline-flex; align-items: center; flex: none; gap: 10px; font-size: 18px; font-weight: 900; }
.brand img { width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 50%; object-fit: contain; background: #0F1A1C; }
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(10px, 1.5vw, 22px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; border-bottom: 1px solid transparent; color: var(--muted); font-family: var(--mono); font-size: 11.5px; letter-spacing: .2px; }
.primary-nav a:hover { border-bottom-color: var(--green); color: var(--text); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; gap: 7px; padding: 0 16px; border: 1px solid var(--green); border-radius: 4px; background: rgba(47, 224, 168, .12); color: var(--green); font-size: 12.5px; font-weight: 900; white-space: nowrap; transition: background .18s ease, color .18s ease; }
.nav-download:hover { background: var(--green); color: #06201A; }
.nav-download svg, .button svg { width: 17px; height: 17px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 40px; height: 40px; padding: 0; border: 1px solid var(--line); border-radius: 4px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 17px; height: 2px; margin: 4.5px auto; background: var(--text); transition: transform .18s ease; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3px) rotate(-45deg); }

/* hero */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); background:
  radial-gradient(58% 76% at 84% 0%, rgba(47, 224, 168, .14) 0%, rgba(47, 224, 168, 0) 62%),
  linear-gradient(180deg, #0D171A, var(--bg) 82%); }
.hero::after { position: absolute; inset: 0; content: ""; pointer-events: none; background-image:
  linear-gradient(90deg, rgba(47, 224, 168, .05) 1px, transparent 1px),
  linear-gradient(180deg, rgba(47, 224, 168, .05) 1px, transparent 1px); background-size: 44px 44px; mask-image: linear-gradient(180deg, #000 0%, transparent 72%); }
.hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr); align-items: center; gap: clamp(28px, 4.4vw, 58px); padding: 58px 0 64px; }
.hero-copy { min-width: 0; }
.hero-kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 16px; color: var(--muted); font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px; }
.hero-kicker b { padding: 2px 7px; border-radius: 2px; background: rgba(47, 224, 168, .16); color: var(--green); font-size: 9px; letter-spacing: 1.4px; }
.hero h1 { margin: 0; font-size: clamp(38px, 5.4vw, 66px); font-weight: 900; letter-spacing: clamp(-.4px, -.22vw, -1.8px); line-height: 1.06; }
.hero-subtitle { margin: 15px 0 0; color: var(--green); font-size: clamp(17px, 1.9vw, 21px); font-weight: 800; line-height: 1.45; }
.hero-lead { max-width: 515px; margin: 13px 0 0; color: var(--muted); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; gap: 11px; padding: 0 26px; border-radius: 4px; font-size: 14px; font-weight: 900; transition: transform .18s ease, background .18s ease; }
.button-primary { background: var(--green); color: #06201A; box-shadow: 0 14px 26px -16px rgba(47, 224, 168, .9); }
.button-primary:hover { background: #57EFC0; transform: translateY(-1px); }
.button-large { min-height: 52px; padding: 0 34px; font-size: 15px; }
.text-link { color: var(--green); border-bottom: 1px dashed rgba(47, 224, 168, .45); font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 28px 0 0; list-style: none; }
.hero-tags li { padding: 5px 12px; border: 1px solid var(--line); border-radius: 3px; color: var(--muted); font-size: 11.5px; }
.hero-tags b { color: var(--text); font-weight: 800; }

.ping-panel { min-width: 0; padding: 20px 22px 18px; border: 1px solid var(--line); border-radius: 8px; background: linear-gradient(180deg, #16242A, #121C20); box-shadow: 0 26px 46px -34px #000; }
.ping-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; }
.ping-head p { margin: 0; color: var(--muted); font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px; }
.ping-head b { display: block; margin-top: 2px; font-family: var(--mono); font-size: 34px; font-weight: 700; line-height: 1.1; letter-spacing: -1px; }
.ping-head b small { margin-left: 4px; color: var(--muted); font-size: 12px; letter-spacing: 0; }
.ping-state { padding: 3px 9px; border: 1px solid rgba(47, 224, 168, .5); border-radius: 999px; color: var(--green); font-size: 10px; }
.ping-spark { width: 100%; height: 54px; margin: 14px 0 4px; }
.ping-list { padding: 0; margin: 0; list-style: none; }
.ping-list li { padding: 9px 0; border-top: 1px solid var(--line); }
.ping-label { display: flex; align-items: center; justify-content: space-between; font-size: 12px; }
.ping-label span { color: var(--muted); }
.ping-label b { font-family: var(--mono); font-size: 12px; font-weight: 500; }
.ping-track { height: 4px; margin-top: 7px; border-radius: 3px; background: #223238; overflow: hidden; }
.ping-track i { display: block; height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--green-deep), var(--green)); }
.ping-foot { margin: 12px 0 0; color: var(--muted); font-size: 10.5px; text-align: right; }

/* features */
.features { padding: 68px 0 72px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 26px; }
.section-heading h2 { margin: 0; font-size: clamp(23px, 2.5vw, 32px); font-weight: 900; letter-spacing: -.4px; line-height: 1.35; }
.section-heading > p:last-child { max-width: 620px; margin: 11px 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 5px; text-align: right; }
.meter-list { padding: 0; margin: 0; list-style: none; border-top: 1px solid var(--line); }
.meter-list li { display: grid; grid-template-columns: 48px minmax(0, 1fr) auto; align-items: center; gap: 18px; padding: 20px 4px; border-bottom: 1px dashed var(--line); }
.meter-list b { color: var(--green); font-family: var(--mono); font-size: 13px; font-weight: 500; letter-spacing: 1px; }
.meter-list h3 { margin: 0 0 3px; font-size: 16.5px; font-weight: 900; }
.meter-list p { margin: 0; color: var(--muted); font-size: 12.8px; }
.meter-list span { padding: 3px 10px; border: 1px solid var(--line); border-radius: 3px; color: var(--muted); font-family: var(--mono); font-size: 10.5px; white-space: nowrap; }

/* shots */
.shots { padding: 68px 0 76px; }
.pair-stack { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.pair-stack figure { display: grid; grid-template-columns: 124px minmax(0, 1fr); align-items: stretch; margin: 0; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); overflow: hidden; }
.pair-stack img { width: 100%; height: 100%; aspect-ratio: 484 / 860; object-fit: cover; object-position: top center; background: #0E191C; }
.pair-stack figcaption { display: flex; flex-direction: column; justify-content: center; gap: 3px; padding: 14px 16px; min-width: 0; }
.pair-stack figcaption b { color: var(--green); font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: 1.4px; }
.pair-stack figcaption span { font-size: 15px; font-weight: 900; }
.pair-stack figcaption small { color: var(--muted); font-size: 11.5px; }
.sample-note { margin: 16px 0 0; color: var(--muted); font-size: 12px; text-align: center; }

/* faq */
.faq { padding: 66px 0 74px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--bg-2); }
.faq-line { border-top: 1px solid var(--line); }
.faq-line details { border-bottom: 1px solid var(--line); }
.faq-line summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 2px; cursor: pointer; list-style: none; }
.faq-line summary::-webkit-details-marker { display: none; }
.faq-line summary h3 { margin: 0; font-size: 15px; font-weight: 900; line-height: 1.5; }
.faq-line summary i { position: relative; flex: none; width: 20px; height: 20px; border: 1px solid var(--line); border-radius: 50%; }
.faq-line summary i::before, .faq-line summary i::after { position: absolute; top: 9px; left: 5px; width: 8px; height: 1.4px; content: ""; background: var(--green); }
.faq-line summary i::after { transform: rotate(90deg); transition: transform .18s ease; }
.faq-line details[open] summary i::after { transform: rotate(0); }
.faq-line details p { margin: 0; padding: 0 0 17px; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* reviews */
.reviews { padding: 68px 0 74px; }
.review-grid { 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: 6px; background: var(--panel); min-width: 0; }
.review-top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding-bottom: 10px; margin-bottom: 10px; border-bottom: 1px dashed var(--line); }
.review-top b { font-size: 12.5px; font-weight: 900; }
.review-top time { color: #6E8480; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #C6D8D3; font-size: 13px; line-height: 1.8; }

/* steps */
.steps { padding: 64px 0 72px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.step-row li { position: relative; padding: 22px 20px 20px 20px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); min-width: 0; }
.step-row span { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; margin-bottom: 12px; border: 1px solid var(--green); border-radius: 50%; color: var(--green); font-family: var(--mono); font-size: 13px; }
.step-row h3 { margin: 0 0 5px; font-size: 17px; font-weight: 900; }
.step-row p { margin: 0; color: var(--muted); font-size: 12.8px; }

/* download */
.download { padding: 70px 0 78px; }
.download-panel { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 32px; padding: 40px 42px; border: 1px solid #2A4A44; border-radius: 8px; background:
  radial-gradient(70% 130% at 100% 0%, rgba(47, 224, 168, .18) 0%, rgba(47, 224, 168, 0) 62%),
  linear-gradient(120deg, #122320, #0E191C); box-shadow: 0 26px 50px -36px #000; }
.download-copy { min-width: 0; }
.download-copy h2 { margin: 0; font-size: clamp(23px, 2.6vw, 32px); font-weight: 900; line-height: 1.35; }
.download-copy p:last-child { margin: 12px 0 0; color: var(--muted); font-size: 13.5px; }
.download-act { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 16px; padding: 0; margin: 0; list-style: none; }
.download-notes li { position: relative; padding-left: 13px; color: var(--muted); font-size: 11.5px; }
.download-notes li::before { position: absolute; top: 8px; left: 0; width: 5px; height: 5px; content: ""; border-radius: 50%; background: var(--green); }

/* footer */
.site-footer { padding: 40px 0 34px; border-top: 1px solid var(--line); background: #080E10; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr) minmax(0, auto); align-items: start; gap: 22px; }
.footer-brand strong { font-size: 16px; font-weight: 900; }
.footer-brand p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.footer-nav a { color: var(--muted); font-size: 12.5px; }
.footer-nav a:hover { color: var(--green); }
.footer-meta { text-align: right; }
.footer-meta p { margin: 0 0 3px; color: var(--muted); font-size: 12px; }
.footer-meta a { color: var(--muted); font-size: 12px; }
.footer-meta a:hover { color: var(--green); }
.disclaimer { grid-column: 1 / -1; padding-top: 16px; margin: 6px 0 0; border-top: 1px dashed var(--line); color: #6E8480; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; padding: 48px 0 52px; }
  .ping-panel { max-width: 540px; }
  .pair-stack { grid-template-columns: minmax(0, 1fr); }
  .download-panel { grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 34px 30px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-meta { grid-column: 1 / -1; text-align: left; }
}
@media (max-width: 900px) {
  .primary-nav { position: absolute; top: 100%; right: 0; left: 0; display: none; margin: 0; padding: 10px 24px 16px; border-bottom: 1px solid var(--line); background: #0D171A; box-shadow: 0 18px 26px -20px #000; }
  .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); font-size: 13px; }
  .primary-nav li:last-child a { border-bottom: 0; }
  .menu-toggle { display: block; }
}
@media (max-width: 760px) {
  .page-shell, .nav-shell { width: min(calc(100% - 36px), var(--shell)); }
  .hero h1 { font-size: clamp(32px, 8.4vw, 44px); }
  .hero-subtitle { font-size: 16.5px; }
  .section-heading-split { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .section-heading-split > p:last-child { text-align: left; }
  .meter-list li { grid-template-columns: 34px minmax(0, 1fr); gap: 12px; padding: 17px 2px; }
  .meter-list li > span { grid-column: 2; justify-self: start; }
  .review-grid { grid-template-columns: minmax(0, 1fr); }
  .step-row { grid-template-columns: minmax(0, 1fr); }
  .download-panel { padding: 30px 22px 28px; }
  .download-act { align-items: stretch; }
  .download .button-primary { width: 100%; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .footer-meta { grid-column: auto; }
  .disclaimer { grid-column: auto; }
}
@media (max-width: 520px) {
  .brand span { display: none; }
  .nav-download { padding: 0 13px; font-size: 12px; }
  .pair-stack figure { grid-template-columns: 96px minmax(0, 1fr); }
  .pair-stack figcaption { padding: 12px 13px; }
  .hero-tags li { padding: 4px 10px; font-size: 11px; }
}