:root {
  --bg: #0D1218;
  --panel: #151C25;
  --panel-2: #1B242F;
  --ink: #E7EDF4;
  --muted: #93A1B2;
  --line: #26313D;
  --amber: #E8B33C;
  --amber-soft: #FFDF9B;
  --steel: #7F93A8;
  --shadow: 0 20px 50px 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(13, 18, 24, .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; }
.brand img { width: 40px; height: 40px; border-radius: 6px; object-fit: contain; background: #101720; 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(--amber); }
.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: 4px; background: var(--amber); color: #1A1408; font-size: 12.5px; font-weight: 900; white-space: nowrap; }
.nav-download:hover { background: #F0C25C; }
.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: 4px; 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-lines { position: absolute; inset: 0; background-image: linear-gradient(90deg, rgba(232, 179, 60, .06) 1px, transparent 1px), linear-gradient(0deg, rgba(232, 179, 60, .05) 1px, transparent 1px); background-size: 72px 72px; 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: 66px 0 70px; }
.hero-kicker { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 16px; padding: 4px 12px; border: 1px solid rgba(232, 179, 60, .35); background: rgba(232, 179, 60, .08); color: var(--amber-soft); font-family: var(--mono); font-size: 11px; letter-spacing: 1.3px; }
.hero-kicker b { color: var(--amber); }
.hero h1 { font-size: clamp(38px, 5.4vw, 62px); font-weight: 900; letter-spacing: -1.2px; line-height: 1.06; }
.hero-subtitle { margin-top: 14px; color: var(--amber); font-size: clamp(17px, 2.1vw, 22px); font-weight: 800; }
.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: 4px; font-size: 14px; font-weight: 900; }
.button-primary { background: var(--amber); color: #1A1408; }
.button-primary:hover { background: #F0C25C; }
.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 #3C4A59; 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); background: var(--panel); color: var(--muted); font-size: 11.5px; }
.hero-tags b { color: var(--amber-soft); }

.tier-panel { padding: 20px 22px; border: 1px solid var(--line); background: var(--panel); box-shadow: var(--shadow); }
.tier-head { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.tier-head p { font-family: var(--mono); font-size: 11px; letter-spacing: 1.6px; color: var(--amber); }
.tier-head span { color: var(--muted); font-size: 10.5px; }
.tier-list { padding: 6px 0 0; margin: 0; list-style: none; }
.tier-list li { display: grid; grid-template-columns: 52px 62px minmax(0, 1fr) 38px; align-items: center; gap: 10px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.tier-list b { font-size: 13px; font-weight: 900; }
.tier-list small { color: var(--muted); font-family: var(--mono); font-size: 10.5px; }
.tier-list i { display: block; height: 5px; background: #2A3542; }
.tier-list li:nth-child(1) i { background: #5E7183; }
.tier-list li:nth-child(2) i { background: #8FA6B8; }
.tier-list li:nth-child(3) i { background: var(--amber); }
.tier-list li:nth-child(4) i { background: #F0C25C; }
.tier-list em { padding: 1px 0; border: 1px solid rgba(232, 179, 60, .5); color: var(--amber); font-size: 10px; font-style: normal; text-align: center; }
.tier-rows { padding-top: 14px; }
.tier-rows p { display: flex; align-items: baseline; justify-content: space-between; padding: 3px 0; color: var(--muted); font-size: 11.5px; }
.tier-rows b { color: var(--ink); font-family: var(--mono); font-size: 12.5px; }
.tier-foot { padding-top: 12px; margin-top: 8px; border-top: 1px solid var(--line); color: #6E7E90; font-family: var(--mono); font-size: 10.5px; }

/* features */
.features { padding: 74px 0 78px; background: #0F151C; }
.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(--amber); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1.8px; }
.eyebrow::before { content: ""; width: 16px; height: 2px; background: var(--amber); }
.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(4, minmax(0, 1fr)); gap: 12px; }
.quad article { min-width: 0; padding: 22px 20px 24px; border: 1px solid var(--line); background: var(--panel); }
.quad span { display: block; margin-bottom: 14px; color: #4E5E6E; font-family: var(--mono); font-size: 20px; font-weight: 700; }
.quad h3 { font-size: 14.5px; font-weight: 900; }
.quad p { margin-top: 8px; color: var(--muted); font-size: 12.6px; }

/* shots */
.shots { padding: 74px 0 80px; }
.frames { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; align-items: start; }
.frames figure { min-width: 0; margin: 0; border: 1px solid var(--line); background: var(--panel); }
.frames figure.big { grid-row: span 2; }
.frames img { width: 100%; height: auto; }
.frames figcaption { display: flex; align-items: baseline; gap: 8px; padding: 11px 14px; border-top: 1px solid var(--line); font-size: 12.5px; font-weight: 900; }
.frames figcaption b { color: var(--amber); font-family: var(--mono); font-size: 10.5px; }
.frames figcaption small { color: var(--muted); font-size: 11px; font-weight: 400; }
.sample-note { margin-top: 16px; color: var(--muted); font-size: 11.5px; }

/* faq */
.faq { padding: 74px 0 78px; border-block: 1px solid var(--line); background: #0F151C; }
.brief { border-left: 2px solid rgba(232, 179, 60, .4); }
.brief details { border-bottom: 1px solid var(--line); padding-left: 22px; }
.brief summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 16px 0; cursor: pointer; list-style: none; }
.brief summary::-webkit-details-marker { display: none; }
.brief summary h3 { font-size: 14.5px; font-weight: 900; }
.brief summary i { position: relative; flex: none; width: 20px; height: 20px; }
.brief summary i::before, .brief summary i::after { content: ""; position: absolute; top: 9px; left: 3px; width: 14px; height: 1.5px; background: var(--amber); }
.brief summary i::after { transform: rotate(90deg); transition: transform .18s ease; }
.brief details[open] summary i::after { transform: rotate(0deg); }
.brief details p { max-width: 64em; padding: 0 0 16px; 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: 12px; padding: 0; margin: 0; list-style: none; }
.review-card { min-width: 0; padding: 20px 22px; border: 1px solid var(--line); background: var(--panel); }
.review-card > p { color: #C4CEDB; 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: var(--amber-soft); 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: #0F151C; }
.step-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; padding: 0; margin: 0; list-style: none; }
.step-row li { position: relative; min-width: 0; padding: 22px 22px 24px; border: 1px solid var(--line); background: var(--panel); }
.step-row li::after { content: "→"; position: absolute; top: 50%; right: -13px; transform: translateY(-50%); color: #3B4753; font-size: 14px; }
.step-row li:last-child::after { display: none; }
.step-row span { display: inline-block; margin-bottom: 12px; color: var(--amber); font-family: var(--mono); font-size: 13px; font-weight: 700; letter-spacing: 1.2px; }
.step-row h3 { font-size: 14.5px; font-weight: 900; }
.step-row p { margin-top: 8px; color: var(--muted); font-size: 12.8px; }

/* download */
.download { padding: 64px 0 70px; background: linear-gradient(120deg, #1A1305, #2B2009 60%, #1A1305); border-block: 1px solid rgba(232, 179, 60, .2); }
.download-panel { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 28px; }
.download-copy .eyebrow { color: var(--amber-soft); }
.download-copy h2 { margin-top: 10px; color: #fff; font-size: clamp(24px, 3vw, 32px); font-weight: 900; }
.download-copy p { margin-top: 10px; color: #C0AC80; 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: #A08E64; font-family: var(--mono); font-size: 11px; }

/* footer */
.site-footer { padding: 46px 0 36px; background: #080C11; }
.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(--amber); }
.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: #66717E; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; padding: 48px 0 52px; }
  .tier-panel { max-width: 520px; }
  .quad { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .frames { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .frames figure.big { grid-row: auto; }
  .step-row { grid-template-columns: 1fr; }
  .step-row li::after { display: none; }
  .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: #0F151C; }
  .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) {
  .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: 32px; }
  .hero-subtitle { font-size: 16px; }
  .quad { grid-template-columns: 1fr; }
  .frames { grid-template-columns: 1fr; }
  .button, .button-large { width: 100%; }
  .text-link { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .brief details { padding-left: 14px; }
}
@media (max-width: 380px) {
  .brand span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}