@charset "UTF-8";

:root {
  --bg: #0C111B;
  --bg-2: #111827;
  --panel: #161F2E;
  --line: #26313F;
  --ink: #E8EDF5;
  --muted: #9AA7B8;
  --red: #EF4444;
  --red-deep: #B91C1C;
  --shell: 1180px;
  --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) + 16px); }
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: 1.75;
  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(--red); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--red);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 2.4px;
}
.eyebrow::before { width: 3px; height: 13px; content: ""; background: var(--red); }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(12, 17, 27, .96);
  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: 18px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 9px; font-family: var(--mono); font-size: 20px; font-weight: 700; letter-spacing: .5px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 8px; object-fit: contain; background: #0A0F19; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 3px;
  background: var(--red);
  color: #150406;
  font-size: 10px;
  font-style: normal;
  font-weight: 900;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(10px, 1.7vw, 22px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 6px 0; border-bottom: 2px solid transparent; color: var(--muted); font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--red); 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 16px;
  border: 1px solid var(--red);
  border-radius: 4px;
  background: var(--red);
  color: #16060A;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--red); }
.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: 42px; height: 42px; padding: 0; border: 1px solid var(--line); border-radius: 6px; 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;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(520px 320px at 96% 4%, rgba(239, 68, 68, .16), transparent 70%),
    linear-gradient(180deg, #131C2B 0%, var(--bg) 82%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: linear-gradient(90deg, rgba(38, 49, 63, .55) 1px, transparent 1px);
  background-size: 64px 100%;
  pointer-events: none;
}
.crumb {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}
.crumb a:hover { color: var(--red); }
.crumb i { color: #4A5768; font-style: normal; }
.crumb span { color: var(--red); }
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  align-items: center;
  gap: clamp(22px, 4vw, 54px);
  padding: 46px 0 52px;
}
.tree {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(17, 24, 39, .78);
}
.tree-col { padding: 12px 8px 14px; border-left: 1px solid var(--line); }
.tree-col:first-child { border-left: 0; }
.tree-col p { margin: 0 0 8px; color: #6E7C8E; font-family: var(--mono); font-size: 9.5px; letter-spacing: 1.4px; }
.tree-col ul { padding: 0; margin: 0; list-style: none; }
.tree-col li { padding: 4px 5px; margin-bottom: 3px; border-radius: 3px; color: #B7C3D2; font-size: 12px; line-height: 1.5; }
.tree-col li.is-on { background: rgba(239, 68, 68, .16); color: #FCA5A5; font-weight: 800; }
.hero-copy { min-width: 0; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 1.4px;
}
.hero-kicker b { padding: 3px 7px; border: 1px solid var(--red); border-radius: 3px; color: var(--red); font-size: 9px; font-weight: 700; }
.hero h1 {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(52px, 7.2vw, 92px);
  font-weight: 700;
  letter-spacing: clamp(-2px, -.5vw, -5px);
  line-height: .98;
}
.hero-subtitle { margin: 16px 0 0; color: #FCA5A5; font-size: clamp(18px, 2vw, 23px); font-weight: 800; line-height: 1.4; }
.hero-lead { max-width: 520px; margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; margin-top: 24px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 12px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--red); color: #16060A; box-shadow: 0 14px 28px rgba(239, 68, 68, .22); }
.button-primary:hover { background: #F87171; transform: translateY(-2px); }
.button-large { min-height: 52px; padding: 0 32px; }
.text-link { color: #C3CDDA; border-bottom: 1px dashed #3B4657; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 4px; color: var(--red); }

/* features */
.features { padding: 62px 0 66px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 26px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(23px, 2.7vw, 31px); font-weight: 900; letter-spacing: -.5px; line-height: 1.32; }
.section-heading > p:last-child { max-width: 620px; margin: 10px 0 0; color: var(--muted); font-size: 13.5px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, 300px); align-items: end; gap: 20px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 1fr);
  gap: 10px;
  padding-bottom: 6px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}
.feature-card {
  min-width: 0;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--red);
  border-radius: 4px;
  background: var(--panel);
  scroll-snap-align: start;
}
.feature-no { display: block; margin-bottom: 8px; color: var(--red); font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: 1.6px; }
.feature-card h3 { margin: 0 0 6px; font-size: 16px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.78; }

/* shots */
.shots { padding: 62px 0 68px; }
.shot-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; align-items: start; }
.shot-card { margin: 0; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); overflow: hidden; }
.shot-card img { width: 100%; height: auto; object-fit: cover; object-position: center top; }
.shot-a img { aspect-ratio: 5 / 6; }
.shot-b img { aspect-ratio: 9 / 16; }
.shot-c img { aspect-ratio: 3 / 4; }
.shot-d img { aspect-ratio: 4 / 5; }
.shot-b { margin-top: 22px; }
.shot-d { margin-top: 12px; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 8px; padding: 10px 12px 11px; border-top: 1px solid var(--line); }
.shot-card figcaption b { color: var(--red); font-family: var(--mono); font-size: 9.5px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 12.5px; font-weight: 800; line-height: 1.4; }
.shot-card figcaption small { color: #77869A; font-size: 10px; font-weight: 500; }

/* faq */
.faq { padding: 62px 0 68px; border-top: 1px solid var(--line); background: var(--bg-2); }
.faq-layout { display: grid; grid-template-columns: minmax(0, .74fr) minmax(0, 1.26fr); gap: clamp(22px, 4vw, 46px); }
.faq-heading { position: sticky; top: calc(var(--header-height) + 22px); align-self: start; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details[open] { background: linear-gradient(90deg, rgba(239, 68, 68, .07), transparent 70%); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 15px 12px 15px 12px; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-size: 15px; font-weight: 900; }
.faq-list summary i { position: relative; flex: none; width: 20px; height: 20px; border: 1px solid var(--line); border-radius: 3px; }
.faq-list summary i::before,
.faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 8px; height: 1.5px; content: ""; background: var(--red); 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 15px 12px; margin: 0; color: var(--muted); font-size: 13.2px; line-height: 1.85; }

/* reviews */
.reviews { padding: 62px 0 68px; }
.review-list { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.review-card {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
}
.avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid #38465A;
  border-radius: 50%;
  background: linear-gradient(150deg, #24303F, #17202C);
  color: #FCA5A5;
  font-size: 15px;
  font-weight: 900;
}
.review-body { min-width: 0; }
.review-meta { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.review-meta b { color: #FCA5A5; font-size: 13px; font-weight: 900; }
.review-meta time { color: #6F7E92; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 4px 0 0; color: #C2CDDA; font-size: 13px; line-height: 1.75; }

/* steps */
.steps { padding: 60px 0 66px; border-top: 1px solid var(--line); background: var(--bg-2); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.step-list li {
  position: relative;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
}
.step-list li::after {
  position: absolute;
  top: 32px;
  right: -9px;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--red);
  border-right: 1px solid var(--red);
  content: "";
  transform: rotate(45deg);
}
.step-list li:last-child::after { content: none; }
.step-list span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 8px;
  border-radius: 50%;
  background: rgba(239, 68, 68, .14);
  color: #FCA5A5;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
}
.step-list h3 { margin: 0 0 4px; font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.72; }

/* download */
.download { padding: 30px 0 40px; }
.download-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 42px clamp(20px, 5vw, 52px) 36px;
  border: 1px solid #3A2530;
  border-radius: 6px;
  background:
    radial-gradient(460px 240px at 50% 0%, rgba(239, 68, 68, .22), transparent 70%),
    linear-gradient(160deg, #1A2331, #101725 78%);
  text-align: center;
}
.download .button { order: 0; margin-bottom: 22px; }
.download h2 { order: 1; max-width: 640px; }
.download-inner > p { order: 2; max-width: 480px; margin: 12px 0 0; color: var(--muted); font-size: 13.5px; }
.download-notes {
  order: 3;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  padding: 18px 0 0;
  margin: 22px 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  width: 100%;
  max-width: 720px;
}
.download-notes li { color: #A9B6C6; font-family: var(--mono); font-size: 10.5px; }
.download-notes li::before { margin-right: 7px; content: "·"; color: var(--red); }

/* footer */
.site-footer { padding: 38px 0 46px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 36px; align-items: start; }
.footer-brand strong { font-family: var(--mono); font-size: 16px; font-weight: 700; }
.footer-brand p { margin: 4px 0 0; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-nav a { color: var(--muted); font-size: 12px; }
.footer-nav a:hover { color: var(--red); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin-top: 20px; padding-top: 15px; 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: #74828F; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: minmax(0, 250px) minmax(0, 1fr); gap: 24px; }
  .tree-col li { font-size: 11.5px; }
  .faq-layout { grid-template-columns: 1fr; gap: 18px; }
  .faq-heading { position: static; }
  .shot-grid { gap: 10px; }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 14px;
    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: 11px 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 768px) {
  .hero-grid { grid-template-columns: 1fr; padding: 34px 0 38px; gap: 24px; }
  .tree { order: 2; }
  .shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .shot-b, .shot-d { margin-top: 0; }
  .step-list { grid-template-columns: 1fr; gap: 10px; }
  .step-list li::after { content: none; }
  .section-heading-split { grid-template-columns: 1fr; gap: 8px; }
  .section-heading-split > p:last-child { margin: 0; }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 30px); }
  .hero h1 { font-size: clamp(38px, 12vw, 54px); }
  .hero-subtitle { font-size: 16px; }
  .hero-lead { font-size: 13.5px; }
  .tree-col { padding: 10px 6px 12px; }
  .tree-col li { padding: 3px 4px; font-size: 11px; }
  .shot-card figcaption { padding: 8px 9px 9px; gap: 6px; }
  .shot-card figcaption span { font-size: 11.5px; }
  .shot-card figcaption small { font-size: 9.5px; }
  .review-card { grid-template-columns: 34px minmax(0, 1fr); gap: 10px; padding: 13px 14px; }
  .avatar { width: 32px; height: 32px; font-size: 13px; }
  .download-inner { padding: 30px 18px 26px; }
  .download .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  .brand { font-size: 18px; gap: 7px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 34px; padding: 0 9px; font-size: 11px; gap: 5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
}