@charset "UTF-8";

:root {
  --paper: #f6f4ee;
  --paper-2: #efece3;
  --card: #ffffff;
  --ink: #191b21;
  --muted: #6b6f7c;
  --line: #e0dbcd;
  --indigo: #3a45f0;
  --indigo-deep: #2a33c4;
  --lime: #b9f24a;
  --shell: 1180px;
  --header-height: 72px;
  --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(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
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(--indigo); 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(--indigo);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  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(246, 244, 238, .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: 22px; font-weight: 900; letter-spacing: -.6px; }
.brand img { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 10px; object-fit: contain; background: #fff; }
.brand-tag {
  padding: 2px 6px;
  border: 1px solid var(--ink);
  border-radius: 3px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 9px;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 1.2px;
  line-height: 1.5;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.9vw, 26px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; border-bottom: 2px solid transparent; color: #4a4f5c; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--indigo); color: var(--ink); }
.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(--ink);
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: var(--lime); color: var(--ink); }
.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: 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: source status strip, spec list left, stacked shots right */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(520px 300px at 88% 8%, rgba(58, 69, 240, .1), transparent 68%),
    linear-gradient(180deg, #fbfaf6 0%, var(--paper) 100%);
}
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: radial-gradient(rgba(25, 27, 33, .14) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(60% 62% at 78% 30%, #000, transparent 92%);
  opacity: .5;
  pointer-events: none;
}
.source-bar {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line);
}
.source-bar-label {
  flex: none;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.6px;
}
.source-bar ul { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 18px; padding: 0; margin: 0; list-style: none; }
.source-bar li { display: inline-flex; align-items: center; gap: 7px; color: #3c4250; font-size: 12px; font-weight: 700; }
.source-bar b { color: var(--muted); font-family: var(--mono); font-size: 10px; font-weight: 600; }
.source-bar-note { margin-left: auto; color: var(--muted); font-size: 11px; }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; flex: none; }
.dot-on { background: #1fae5b; box-shadow: 0 0 0 3px rgba(31, 174, 91, .14); }
.dot-warn { background: #e8a41b; box-shadow: 0 0 0 3px rgba(232, 164, 27, .16); }
.dot-off { background: #b3b0a6; box-shadow: 0 0 0 3px rgba(179, 176, 166, .18); }

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 410px);
  align-items: center;
  gap: clamp(30px, 5vw, 70px);
  padding: 52px 0 66px;
}
.hero-copy { min-width: 0; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
}
.hero-kicker span {
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--indigo);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
}
.hero h1 {
  margin: 0;
  font-size: clamp(54px, 7vw, 96px);
  font-weight: 900;
  letter-spacing: clamp(-2px, -.4vw, -4px);
  line-height: .96;
}
.hero-subtitle {
  margin: 18px 0 0;
  color: var(--ink);
  font-size: clamp(18px, 2.1vw, 24px);
  font-weight: 800;
  line-height: 1.45;
}
.hero-subtitle::after {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-left: 8px;
  content: "";
  border-radius: 2px;
  background: var(--lime);
  vertical-align: 3px;
}
.hero-lead { max-width: 540px; margin: 16px 0 0; color: var(--muted); font-size: 15px; }
.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 24px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 900;
  transition: transform .18s ease, background .18s ease, color .18s ease;
}
.button-primary { background: var(--indigo); color: #fff; box-shadow: 0 12px 24px rgba(42, 51, 196, .24); }
.button-primary:hover { background: var(--indigo-deep); transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #3c4250; border-bottom: 1px dashed #a9a496; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--indigo); }

.source-list { padding: 0; margin: 32px 0 0; list-style: none; border-top: 1px solid var(--line); }
.source-list li {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.2fr) 34px;
  align-items: center;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}
.src-name { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 800; }
.src-name i { width: 6px; height: 6px; }
.src-meta { color: var(--muted); font-family: var(--mono); font-size: 11px; }
.src-state {
  justify-self: end;
  width: 26px;
  padding: 1px 0;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  text-align: center;
}
.source-list li:first-child .src-state { border-color: rgba(31, 174, 91, .4); background: rgba(31, 174, 91, .1); color: #167a41; }

.hero-stack { position: relative; min-height: 520px; }
.stack-card {
  position: absolute;
  margin: 0;
  padding: 8px 8px 4px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 22px 44px rgba(28, 30, 40, .16);
}
.stack-card img { width: 100%; height: auto; aspect-ratio: 9 / 16; border-radius: 8px; object-fit: cover; object-position: top; }
.stack-card figcaption { padding: 7px 4px 3px; color: var(--muted); font-family: var(--mono); font-size: 10px; letter-spacing: .6px; text-align: center; }
.stack-main { top: 0; left: 4px; z-index: 2; width: min(70%, 292px); transform: rotate(-3deg); }
.stack-side { right: 12px; bottom: 0; z-index: 3; width: min(47%, 208px); transform: rotate(4deg); }
.stack-badge {
  position: absolute;
  left: 2%;
  bottom: 4%;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 86px;
  height: 86px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 12px 24px rgba(25, 27, 33, .16);
}
.stack-badge b { font-family: var(--mono); font-size: 24px; line-height: 1; }
.stack-badge span { font-size: 10px; font-weight: 800; }

/* focus grid */
.features { padding: 74px 0 78px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.section-heading { margin-bottom: 32px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(25px, 2.9vw, 36px); font-weight: 900; letter-spacing: -.9px; line-height: 1.3; }
.section-heading > p:last-child { max-width: 620px; margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(240px, 330px); align-items: end; gap: 30px; }
.section-heading-split > p:last-child { margin: 0 0 5px; }
.spec-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid #cfc9b9; border-left: 1px solid #cfc9b9; }
.spec-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 28px 26px;
  border-right: 1px solid #cfc9b9;
  border-bottom: 1px solid #cfc9b9;
  background: rgba(255, 255, 255, .5);
  transition: background .2s ease;
}
.spec-item:hover { background: #fff; }
.spec-no { color: var(--indigo); font-family: var(--mono); font-size: 13px; font-weight: 700; }
.spec-item h3 { margin: 0 0 8px; font-size: 17px; font-weight: 900; letter-spacing: -.2px; }
.spec-item p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

/* shots mosaic */
.shots { padding: 76px 0 80px; }
.shot-mosaic { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); align-items: start; gap: 18px; }
.shot-card { margin: 0; padding: 7px 7px 0; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.shot-card:nth-child(even) { margin-top: 26px; }
.shot-wide { grid-column: span 1; }
.shot-card img { width: 100%; height: auto; aspect-ratio: 9 / 16; border-radius: 5px; object-fit: cover; object-position: top; background: var(--paper-2); }
.shot-card figcaption {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 6px 13px;
  border-top: 1px solid #f0ece1;
  margin-top: 7px;
}
.shot-card figcaption b { color: var(--indigo); font-family: var(--mono); font-size: 11px; }
.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-family: var(--mono); font-size: 10px; font-weight: 500; }

/* faq */
.faq { padding: 74px 0 80px; background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.faq-layout { display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); align-items: start; gap: clamp(28px, 5vw, 64px); }
.faq-heading { position: sticky; top: calc(var(--header-height) + 26px); margin: 0; }
.faq-list { border-top: 1px solid #cfc9b9; }
.faq-list details { border-bottom: 1px solid #cfc9b9; }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-size: 15px; font-weight: 800; line-height: 1.5; }
.faq-list summary i { position: relative; flex: none; width: 20px; height: 20px; border: 1px solid #b9b3a3; border-radius: 50%; }
.faq-list summary i::before, .faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 9px;
  height: 1.5px;
  content: "";
  background: currentColor;
  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 30px 20px 2px; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews */
.reviews { padding: 76px 0 80px; }
.review-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 22px 20px; border: 1px solid var(--line); border-top: 2px solid var(--indigo); background: #fff; }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 6px; padding-bottom: 11px; border-bottom: 1px dashed #ece7da; margin-bottom: 11px; }
.review-meta b { font-size: 13px; font-weight: 900; }
.review-meta time { color: var(--muted); font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #454a56; font-size: 13px; line-height: 1.8; }

/* steps */
.steps { padding: 70px 0 78px; border-top: 1px solid var(--line); background: var(--paper-2); }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; padding: 0; margin: 34px 0 0; list-style: none; counter-reset: step; }
.step-list li { position: relative; padding: 26px 22px 24px; border: 1px solid #cfc9b9; background: var(--paper); }
.step-list li::before {
  position: absolute;
  top: 18px;
  right: 16px;
  color: rgba(25, 27, 33, .14);
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
}
.step-list li:nth-child(1)::before { content: "1"; }
.step-list li:nth-child(2)::before { content: "2"; }
.step-list li:nth-child(3)::before { content: "3"; }
.step-list span { display: inline-block; padding: 1px 7px; border: 1px solid var(--ink); border-radius: 3px; font-family: var(--mono); font-size: 10px; }
.step-list h3 { margin: 14px 0 8px; font-size: 18px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* download */
.download { padding: 22px 0; }
.download-inner {
  position: relative;
  overflow: hidden;
  padding: 54px clamp(24px, 5vw, 62px) 48px;
  border-radius: 10px;
  background: var(--ink);
  color: #f4f2ec;
}
.download-inner::after {
  position: absolute;
  right: -60px;
  bottom: -90px;
  width: 280px;
  height: 280px;
  content: "";
  border-radius: 50%;
  background: radial-gradient(circle, rgba(185, 242, 74, .32), transparent 66%);
}
.download .eyebrow { color: var(--lime); }
.download h2 { max-width: 640px; color: #fff; }
.download-inner > p { max-width: 560px; margin: 14px 0 26px; color: #b9bdca; font-size: 14px; }
.download .button-primary { position: relative; z-index: 2; background: var(--lime); color: var(--ink); box-shadow: 0 12px 26px rgba(0, 0, 0, .28); }
.download .button-primary:hover { background: #caf76f; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 24px; padding: 24px 0 0; margin: 30px 0 0; border-top: 1px solid rgba(255, 255, 255, .14); list-style: none; }
.download-notes li { color: #b9bdca; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 8px; color: var(--lime); content: "/"; }

/* footer */
.site-footer { padding: 46px 0 54px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 22px 40px; align-items: start; }
.footer-brand strong { font-size: 19px; 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: #4a4f5c; font-size: 12px; }
.footer-nav a:hover { color: var(--indigo); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 26px; padding-top: 20px; 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: #8d909b; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr) minmax(270px, 340px); }
  .hero-stack { min-height: 440px; }
  .source-bar-note { display: none; }
}
@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 8px 24px 18px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 16px 24px rgba(25, 27, 33, .08);
  }
  .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); border-left: 0; }
  .hero-inner { grid-template-columns: 1fr; padding: 40px 0 46px; }
  .hero-stack { min-height: 0; display: flex; align-items: flex-start; gap: 14px; }
  .stack-card { position: static; width: 50%; transform: none; }
  .stack-badge { left: auto; right: 6%; bottom: 8%; width: 66px; height: 66px; }
  .stack-badge b { font-size: 19px; }
  .spec-grid { grid-template-columns: 1fr; }
  .shot-mosaic { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-card:nth-child(even) { margin-top: 0; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-heading { position: static; }
  .review-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step-list { grid-template-columns: 1fr; }
  .section-heading-split { grid-template-columns: 1fr; gap: 8px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .brand-tag { display: none; }
  .nav-download { min-height: 38px; padding: 0 12px; font-size: 12px; }
  .hero h1 { font-size: clamp(44px, 14vw, 60px); }
  .hero-lead { font-size: 14px; }
  .source-list li { grid-template-columns: minmax(0, 1fr) auto 30px; gap: 8px; }
  .src-meta { font-size: 10px; text-align: right; }
  .hero-stack { gap: 10px; }
  .stack-badge { display: none; }
  .features, .shots, .faq, .reviews, .steps { padding: 48px 0 52px; }
  .shot-mosaic { gap: 12px; }
  .review-list { grid-template-columns: 1fr; }
  .download-inner { padding: 36px 22px 32px; }
  .download-notes { gap: 6px 18px; }
  .footer-nav { gap: 8px 16px; }
}
@media (max-width: 380px) {
  .brand { font-size: 17px; letter-spacing: -.2px; gap: 7px; }
  .brand img { width: 30px; height: 30px; }
  .nav-shell { gap: 8px; }
  .nav-actions { gap: 6px; }
  .nav-download { min-height: 34px; padding: 0 8px; gap: 5px; font-size: 11px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 34px; height: 34px; }
  .source-bar { gap: 8px 14px; }
  .source-bar li { font-size: 11px; }
  .src-meta { font-size: 9px; }
  .stack-card { padding: 6px 6px 3px; }
}