:root {
  --bg: #0A0C14;
  --panel: #141826;
  --panel-2: #1B2033;
  --ink: #E9ECF5;
  --muted: #98A2B8;
  --line: #252B3D;
  --violet: #A855F7;
  --cyan: #22D3EE;
  --shadow: 0 22px 60px rgba(0, 0, 0, .45);
  --shell: 1140px;
  --header-height: 72px;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 18px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
ul, ol { margin: 0; }
.page-shell { width: min(calc(100% - 44px), var(--shell)); margin: 0 auto; }

/* header */
.site-header { position: sticky; top: 0; z-index: 60; border-bottom: 1px solid var(--line); background: rgba(10, 12, 20, .9); backdrop-filter: blur(14px); }
.nav-shell { display: flex; align-items: center; justify-content: space-between; width: min(calc(100% - 44px), var(--shell)); min-height: var(--header-height); margin: 0 auto; gap: 16px; }
.brand { display: inline-flex; align-items: center; flex: none; gap: 10px; font-size: 16px; font-weight: 900; letter-spacing: .2px; }
.brand img { width: 40px; height: 40px; border-radius: 10px; object-fit: contain; background: #0F1322; border: 1px solid var(--line); }
.primary-nav ul { display: flex; align-items: center; gap: clamp(10px, 1.4vw, 20px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 8px 0; color: var(--muted); font-size: 13px; font-weight: 700; }
.primary-nav a:hover { color: var(--cyan); }
.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: 7px; padding: 0 16px; border-radius: 999px; background: linear-gradient(100deg, var(--violet), #6366F1); color: #fff; font-size: 12.5px; font-weight: 900; white-space: nowrap; }
.nav-download:hover { filter: brightness(1.1); }
.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: 10px; background: var(--panel); 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); }
.hero-glow { position: absolute; inset: -20% -10% auto auto; width: 640px; height: 640px; border-radius: 50%; background: radial-gradient(circle, rgba(168, 85, 247, .28), rgba(34, 211, 238, .08) 45%, transparent 70%); filter: blur(10px); pointer-events: none; }
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr); align-items: center; gap: clamp(28px, 4vw, 56px); padding: 68px 0 72px; }
.hero-kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 16px; padding: 4px 12px; border: 1px solid rgba(168, 85, 247, .35); border-radius: 999px; background: rgba(168, 85, 247, .1); color: #C9B6FF; font-family: var(--mono); font-size: 11px; letter-spacing: 1.2px; }
.hero-kicker b { color: #fff; }
.hero h1 { font-size: clamp(40px, 5.6vw, 62px); font-weight: 900; letter-spacing: -1.4px; line-height: 1.06; background: linear-gradient(96deg, #fff 20%, #D8C4FF 55%, #7DE7F5 95%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-subtitle { margin-top: 14px; color: var(--cyan); font-size: clamp(17px, 2.1vw, 22px); font-weight: 800; letter-spacing: .3px; }
.hero-lead { max-width: 31em; margin-top: 16px; 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-radius: 999px; font-size: 14px; font-weight: 900; }
.button-primary { background: linear-gradient(100deg, var(--violet), #6366F1 70%, #3B82F6); color: #fff; box-shadow: 0 12px 34px rgba(139, 92, 246, .35); }
.button-primary:hover { filter: brightness(1.1); }
.button-large { min-height: 56px; padding: 0 32px; font-size: 15px; }
.text-link { color: var(--muted); font-size: 13px; font-weight: 700; border-bottom: 1px dashed #3A4258; padding-bottom: 2px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 26px 0 0; list-style: none; }
.hero-tags li { padding: 5px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--muted); font-size: 11.5px; }
.hero-tags b { color: #C9B6FF; }

.skin-panel { padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: linear-gradient(170deg, var(--panel-2), var(--panel)); box-shadow: var(--shadow); }
.skin-head { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.skin-head p { font-size: 13px; font-weight: 800; letter-spacing: 1px; }
.skin-head b { color: var(--cyan); font-family: var(--mono); font-size: 15px; }
.skin-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; padding: 16px 0 0; margin: 0; list-style: none; }
.skin-grid li { padding: 9px 8px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); font-size: 11.5px; text-align: center; }
.skin-grid li span { display: block; height: 34px; margin-bottom: 7px; border-radius: 5px; background: linear-gradient(135deg, var(--c1), var(--c2)); }
.skin-grid li.is-on { border-color: rgba(34, 211, 238, .6); background: rgba(34, 211, 238, .08); color: #CFFAFE; box-shadow: 0 0 0 1px rgba(34, 211, 238, .25) inset; }
.skin-now { padding-top: 14px; margin-top: 14px; border-top: 1px solid var(--line); color: #C9B6FF; font-size: 12px; }
.skin-foot { margin-top: 4px; color: var(--muted); font-family: var(--mono); font-size: 10.5px; }

/* features */
.features { padding: 74px 0 78px; background: #0C0F19; }
.section-heading { max-width: 720px; margin-bottom: 34px; }
.section-heading .eyebrow { margin-bottom: 12px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1.8px; }
.eyebrow::before { content: ""; width: 16px; height: 2px; background: linear-gradient(90deg, var(--violet), var(--cyan)); }
.section-heading h2 { font-size: clamp(25px, 3.2vw, 34px); font-weight: 900; letter-spacing: -.4px; line-height: 1.3; }
.section-heading p { margin-top: 10px; color: var(--muted); font-size: 13.5px; }
.section-heading-split { display: flex; align-items: flex-end; justify-content: space-between; max-width: none; gap: 24px; }

.quad { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.quad-item { position: relative; min-width: 0; padding: 24px 24px 26px 26px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.quad-item::before { content: ""; position: absolute; top: 24px; bottom: 24px; left: 0; width: 2px; background: linear-gradient(180deg, var(--violet), var(--cyan)); }
.quad-item h3 { font-size: 15px; font-weight: 900; }
.quad-item p { margin-top: 8px; color: var(--muted); font-size: 12.9px; }

/* shots */
.shots { padding: 74px 0 80px; }
.phone-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.phone-grid figure { min-width: 0; margin: 0; }
.phone { padding: 8px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(160deg, #1C2136, #12151F); box-shadow: var(--shadow); }
.phone img { width: 100%; height: auto; border-radius: 12px; }
.phone-grid figcaption { display: flex; align-items: baseline; gap: 8px; margin-top: 12px; font-size: 12.5px; font-weight: 900; }
.phone-grid figcaption b { color: var(--cyan); font-family: var(--mono); font-size: 10.5px; }
.phone-grid figcaption small { color: var(--muted); font-size: 11px; font-weight: 400; }
.sample-note { margin-top: 18px; color: var(--muted); font-size: 11.5px; }

/* faq */
.faq { padding: 74px 0 78px; border-block: 1px solid var(--line); background: #0C0F19; }
.ask-list { display: grid; gap: 0; }
.ask-list details { border-bottom: 1px solid var(--line); }
.ask-list summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 17px 2px; cursor: pointer; list-style: none; }
.ask-list summary::-webkit-details-marker { display: none; }
.ask-list summary h3 { font-size: 14.5px; font-weight: 900; }
.ask-list summary i { position: relative; flex: none; width: 22px; height: 22px; border: 1px solid var(--line); border-radius: 50%; }
.ask-list summary i::before, .ask-list summary i::after { content: ""; position: absolute; top: 10px; left: 5px; width: 10px; height: 1.5px; background: var(--cyan); }
.ask-list summary i::after { transform: rotate(90deg); transition: transform .18s ease; }
.ask-list details[open] summary i::after { transform: rotate(0deg); }
.ask-list details p { max-width: 66em; padding: 0 2px 18px; color: var(--muted); font-size: 13px; line-height: 1.85; }

/* reviews */
.reviews { padding: 74px 0 78px; }
.review-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.review-card { min-width: 0; padding: 20px 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.review-card > p { color: #C7CEE0; font-size: 13.2px; }
.review-meta { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 6px; padding-top: 12px; margin-top: 12px; border-top: 1px solid var(--line); }
.review-meta b { color: #C9B6FF; font-size: 12px; }
.review-meta time { color: var(--muted); font-family: var(--mono); font-size: 10.5px; }

/* steps */
.steps { padding: 74px 0 80px; border-block: 1px solid var(--line); background: #0C0F19; }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.step-list li { min-width: 0; padding: 22px 22px 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.step-list b { display: inline-block; margin-bottom: 10px; font-family: var(--mono); font-size: 24px; font-weight: 800; letter-spacing: -1px; background: linear-gradient(120deg, var(--violet), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.step-list h3 { font-size: 15px; font-weight: 900; }
.step-list p { margin-top: 8px; color: var(--muted); font-size: 12.9px; }

/* download */
.download { padding: 66px 0 72px; }
.download-panel { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 28px; padding: 36px; border: 1px solid rgba(168, 85, 247, .35); border-radius: 18px; background: radial-gradient(120% 160% at 0% 0%, rgba(168, 85, 247, .22), transparent 55%), radial-gradient(120% 160% at 100% 100%, rgba(34, 211, 238, .18), transparent 55%), var(--panel); }
.download-copy .eyebrow { color: #C9B6FF; }
.download-copy h2 { margin-top: 10px; color: #fff; font-size: clamp(24px, 3vw, 32px); font-weight: 900; }
.download-copy p { margin-top: 10px; color: var(--muted); font-size: 13px; }
.download-act { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 16px; padding: 0; margin: 0; list-style: none; color: #8E9AB2; font-family: var(--mono); font-size: 11px; }

/* footer */
.site-footer { padding: 46px 0 36px; border-top: 1px solid var(--line); background: #080A11; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.3fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.footer-brand strong { font-size: 16px; font-weight: 900; }
.footer-brand p { margin-top: 6px; color: var(--muted); font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 12.5px; }
.footer-nav a { color: var(--muted); }
.footer-nav a:hover { color: var(--cyan); }
.footer-meta { color: var(--muted); font-size: 12px; text-align: right; }
.footer-meta a { display: inline-block; margin-top: 6px; font-size: 11.5px; }
.disclaimer { grid-column: 1 / -1; padding-top: 18px; margin-top: 4px; border-top: 1px solid var(--line); color: #6D7893; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; padding: 48px 0 52px; }
  .skin-panel { max-width: 520px; }
  .phone-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step-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; padding: 8px 22px 16px; border-bottom: 1px solid var(--line); background: #0C0F19; }
  .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); font-size: 14px; }
  .menu-toggle { display: block; }
}
@media (max-width: 760px) {
  .quad { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .page-shell, .nav-shell { width: calc(100% - 34px); }
  .brand { font-size: 13.5px; }
  .nav-download { padding: 0 12px; }
  .nav-download span { font-size: 11.5px; }
  .hero h1 { font-size: 36px; }
  .hero-subtitle { font-size: 16px; }
  .skin-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .button, .button-large { width: 100%; }
  .text-link { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .download-panel { padding: 24px 20px; }
}
@media (max-width: 380px) {
  .brand span { display: none; }
  .phone-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}