@charset "UTF-8";

:root {
  --bg: #120826;
  --bg-2: #170B2E;
  --panel: #1E1040;
  --line: #33215C;
  --line-strong: #4B2E80;
  --ink: #F4EFFF;
  --muted: #B4A6D6;
  --berry: #4C1D95;
  --berry-deep: #38146F;
  --accent: #22D3EE;
  --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) + 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(--accent); 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(--accent);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2.4px;
  line-height: 1.4;
}
.eyebrow::before { width: 16px; height: 2px; content: ""; background: currentColor; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(18, 8, 38, .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: .4px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 12px; object-fit: contain; background: #1B0F38; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 6px;
  background: var(--accent);
  color: #06202A;
  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, 1.9vw, 25px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; border-bottom: 2px solid transparent; color: #C3B5E2; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--accent); 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(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: #06202A;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: transparent; color: var(--accent); }
.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;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(640px 420px at 88% -6%, rgba(34, 211, 238, .2), transparent 68%),
    radial-gradient(520px 420px at 2% 106%, rgba(76, 29, 149, .55), transparent 72%),
    linear-gradient(180deg, #1B0C3B 0%, var(--bg) 100%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: repeating-linear-gradient(115deg, rgba(34, 211, 238, .05) 0 1px, transparent 1px 54px);
  mask-image: linear-gradient(180deg, #000, transparent 94%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  align-items: center;
  gap: clamp(26px, 4vw, 56px);
  padding: 62px 0 66px;
}
.hero-copy { min-width: 0; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  color: #C3B5E2;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.4px;
}
.hero-kicker b {
  padding: 3px 8px;
  border-radius: 5px;
  background: var(--berry);
  color: #EAE0FF;
  font-size: 9.5px;
  font-weight: 900;
  letter-spacing: 1.2px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(54px, 7.6vw, 96px);
  font-weight: 900;
  letter-spacing: clamp(-2px, -.4vw, -4px);
  line-height: .98;
  background: linear-gradient(96deg, #FFFFFF 8%, #C9B6FF 52%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  margin: 18px 0 0;
  color: var(--accent);
  font-size: clamp(18px, 2.1vw, 24px);
  font-weight: 800;
  line-height: 1.4;
}
.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: 20px; margin-top: 26px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  gap: 14px;
  padding: 0 26px;
  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(--accent); color: #06202A; box-shadow: 0 14px 30px rgba(34, 211, 238, .2); }
.button-primary:hover { background: #6FE3F5; transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #D6C9F0; border-bottom: 1px dashed #533A87; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--accent); }

/* hero branch tree */
.tree-panel {
  min-width: 0;
  padding: 20px 20px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background:
    radial-gradient(340px 200px at 100% 0%, rgba(34, 211, 238, .16), transparent 70%),
    linear-gradient(168deg, rgba(76, 29, 149, .62), rgba(18, 8, 38, .92));
  box-shadow: 0 26px 50px rgba(0, 0, 0, .42);
}
.panel-head { display: flex; align-items: center; justify-content: space-between; margin: 0 0 12px; color: var(--accent); font-family: var(--mono); font-size: 11px; letter-spacing: 1.6px; }
.panel-head b { color: var(--muted); font-weight: 700; }
.tree-tabs {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(12, 5, 26, .7);
}
.tree-tabs span { padding: 5px 18px; border-radius: 999px; color: var(--muted); font-size: 12px; font-weight: 800; }
.tree-tabs .is-active { background: var(--accent); color: #06202A; }
.tree { display: block; padding: 0; margin: 18px 0 0; list-style: none; }
.tree-node {
  position: relative;
  width: 78%;
  padding: 11px 14px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: rgba(16, 7, 33, .82);
}
.tree-node b { display: block; margin: 3px 0 2px; font-size: 14px; font-weight: 900; line-height: 1.45; }
.tree-node small { display: block; color: var(--muted); font-size: 11.5px; line-height: 1.6; }
.node-tag { display: inline-block; color: var(--accent); font-family: var(--mono); font-size: 9.5px; letter-spacing: 1.6px; }
.node-a { margin-left: 0; }
.node-b { margin-left: 20%; border-color: rgba(34, 211, 238, .62); box-shadow: 0 0 0 1px rgba(34, 211, 238, .16) inset, 0 10px 22px rgba(3, 20, 28, .4); }
.node-b .node-tag { color: #7CE9F8; }
.node-c { margin-left: 6%; }
.tree-link { position: relative; display: block; height: 28px; padding: 0; list-style: none; }
.tree-link::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--from);
  width: 1px;
  content: "";
  background: linear-gradient(180deg, rgba(34, 211, 238, .28), rgba(34, 211, 238, .9));
}
.tree-link::after {
  position: absolute;
  bottom: 0;
  left: min(var(--from), var(--to));
  width: calc(max(var(--from), var(--to)) - min(var(--from), var(--to)));
  height: 1px;
  content: "";
  background: rgba(34, 211, 238, .8);
}
.link-a { --from: 10%; --to: 20%; }
.link-b { --from: 20%; --to: 6%; }
.tree-hint {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 10px;
  padding: 12px 0 0;
  margin: 16px 0 0;
  border-top: 1px dashed var(--line-strong);
  color: #D3C6EC;
  font-family: var(--mono);
  font-size: 11.5px;
}
.tree-hint span { padding: 2px 9px; border-radius: 999px; background: rgba(34, 211, 238, .16); color: var(--accent); }
.tree-hint i { color: #6A5195; font-style: normal; }

/* features */
.features { padding: 74px 0 78px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.section-heading { margin-bottom: 32px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(24px, 2.8vw, 35px); font-weight: 900; letter-spacing: -.6px; line-height: 1.3; }
.section-heading > p:last-child { max-width: 620px; margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.feature-card {
  padding: 24px 20px 22px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--berry);
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(76, 29, 149, .32), rgba(30, 16, 64, .9));
}
.feature-no { display: block; margin-bottom: 10px; color: var(--accent); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1.6px; }
.feature-card h3 { margin: 0 0 7px; font-size: 17px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.8; }

/* shots: 3 columns, first card spans two rows, fourth spans two columns */
.shots { padding: 74px 0 80px; }
.shot-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-rows: 228px; gap: 14px; }
.shot-card {
  display: flex;
  flex-direction: column;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  overflow: hidden;
}
.shot-card:first-child { grid-row: span 2; }
.shot-card:nth-child(4) { grid-column: span 2; }
.shot-card img { flex: 1 1 0; width: 100%; height: 100%; min-height: 0; object-fit: cover; object-position: center 6%; }
.shot-card:first-child img { object-position: center 10%; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 8px; padding: 10px 13px 11px; border-top: 1px solid var(--line); }
.shot-card figcaption b { color: var(--accent); font-family: var(--mono); font-size: 10px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 13px; font-weight: 800; line-height: 1.4; }
.shot-card figcaption small { color: var(--muted); font-size: 10.5px; 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, .8fr) minmax(0, 1.2fr); gap: clamp(24px, 4vw, 52px); }
.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: 17px 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: 22px; height: 22px; border: 1px solid var(--line-strong); 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: var(--accent); 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 28px 17px 0; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: two columns */
.reviews { padding: 74px 0 80px; }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.review-card {
  padding: 16px 20px 17px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--berry);
  border-radius: 8px;
  background: var(--panel);
}
.review-meta { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 7px; }
.review-meta b { color: #D9CBF4; font-size: 13px; font-weight: 900; }
.review-meta time { color: #8471AC; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #C2B4DF; font-size: 13px; line-height: 1.75; }

/* steps: horizontal */
.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: 12px; padding: 0; margin: 0; list-style: none; }
.step-list li {
  padding: 22px 22px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}
.step-list span { display: block; margin-bottom: 12px; color: var(--accent); font-family: var(--mono); font-size: 28px; font-weight: 700; line-height: 1; }
.step-list h3 { margin: 0 0 5px; font-size: 16px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.75; }

/* download: copy left, button right */
.download { padding: 26px 0; }
.download-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 26px 40px;
  padding: 48px clamp(24px, 5vw, 58px) 42px;
  border: 1px solid #4A2C86;
  border-radius: 14px;
  background:
    radial-gradient(420px 240px at 96% 0%, rgba(34, 211, 238, .22), transparent 70%),
    linear-gradient(118deg, #2E1463, #1E1040 84%);
}
.download-copy { min-width: 0; }
.download h2 { max-width: 600px; }
.download-copy > p { max-width: 520px; margin: 13px 0 0; color: #C6B8E4; font-size: 14px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 22px; padding: 18px 0 0; margin: 20px 0 0; border-top: 1px solid rgba(34, 211, 238, .22); list-style: none; }
.download-notes li { color: #9FE8F3; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 8px; content: "·"; color: var(--accent); }
.download .button-primary { background: var(--accent); color: #06202A; }

/* 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: #C3B5E2; font-size: 12px; }
.footer-nav a:hover { color: var(--accent); }
.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: #8471AC; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 360px); gap: 24px; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows: 220px; }
  .shot-card:first-child { grid-row: span 1; }
  .shot-card:nth-child(4) { grid-column: span 1; }
  .download-inner { grid-template-columns: 1fr; }
}
@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); }
  .hero-grid { grid-template-columns: 1fr; padding: 46px 0 50px; }
  .tree-panel { max-width: 460px; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-heading { position: static; }
}
@media (max-width: 768px) {
  .feature-grid { grid-template-columns: 1fr; }
  .review-list { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; }
  .step-list span { display: inline-block; margin: 0 10px 0 0; font-size: 22px; vertical-align: middle; }
  .step-list h3 { display: inline-block; margin: 0 0 6px; }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero h1 { font-size: clamp(44px, 13vw, 62px); }
  .hero-lead { font-size: 14px; }
  .tree-panel { padding: 16px 14px 12px; }
  .tree-node { width: 88%; }
  .shot-grid { grid-template-columns: 1fr; grid-auto-rows: 240px; }
  .shot-card:nth-child(4) { grid-column: span 1; }
  .download-inner { padding: 34px 20px 30px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 16px; gap: 7px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-actions { gap: 8px; }
  .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; }
  .hero h1 { font-size: 42px; }
  .hero-subtitle { font-size: 16px; }
  .button { width: 100%; }
  .tree-tabs span { padding: 4px 13px; font-size: 11px; }
  .tree-hint { font-size: 10.5px; }
}