@charset "UTF-8";

:root {
  --sky: #1b9cfc;
  --sky-deep: #0b7cd0;
  --sky-soft: #e8f4ff;
  --ink: #16202a;
  --ink-2: #223040;
  --muted: #5c6c7c;
  --line: #dce7f1;
  --paper: #f4f9fe;
  --white: #ffffff;
  --shell: 1160px;
  --header-height: 68px;
  --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(--white);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}
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(--sky); outline-offset: 3px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--sky-deep);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 2.4px;
  line-height: 1.5;
  text-transform: uppercase;
}
.eyebrow::before { width: 16px; height: 2px; content: ""; background: var(--sky); }

/* ticker */
.ticker {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 34px;
  padding: 0 16px;
  background: var(--ink);
  color: #d6e6f5;
  font-size: 11.5px;
  overflow: hidden;
}
.ticker-tag {
  flex: none;
  padding: 1px 7px;
  border-radius: 3px;
  background: var(--sky);
  color: #04131f;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 1.2px;
}
.ticker-window { flex: 1; min-width: 0; overflow: hidden; }
.ticker-text {
  margin: 0;
  white-space: nowrap;
  letter-spacing: .4px;
  animation: ticker-run 26s linear infinite;
}
@keyframes ticker-run {
  from { transform: translateX(0); }
  to { transform: translateX(-100%); }
}
@media (prefers-reduced-motion: reduce) {
  .ticker-text { animation: none; }
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .97);
  backdrop-filter: blur(12px);
}
.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: 21px; font-weight: 900; letter-spacing: -.5px; }
.brand img { width: 34px; height: 34px; border-radius: 9px; object-fit: contain; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: var(--ink);
  color: #bfe4ff;
  font-family: var(--mono);
  font-size: 10px;
  font-style: normal;
  font-weight: 900;
}
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(11px, 1.8vw, 25px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; color: #4a5c6d; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { color: var(--sky-deep); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 10px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  gap: 8px;
  padding: 0 18px;
  border: 1px solid var(--sky);
  border-radius: 8px;
  background: var(--sky);
  color: #04131f;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  box-shadow: 0 6px 0 #0d6ba9;
  transition: transform .16s ease, box-shadow .16s ease;
}
.nav-download:hover { transform: translateY(2px); box-shadow: 0 4px 0 #0d6ba9; }
.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: 40px; height: 40px; padding: 0; border: 1px solid var(--line); border-radius: 8px; 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: centered copy + three-column cover wall + floating badge */
.hero {
  position: relative;
  padding: 54px 0 74px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(540px 300px at 50% -60px, rgba(27, 156, 252, .18), transparent 72%),
    linear-gradient(180deg, #f2f9ff, #ffffff 68%);
  overflow: hidden;
}
.hero-inner { position: relative; z-index: 2; text-align: center; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  color: #4b6b85;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 1.3px;
}
.hero-kicker b {
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--sky);
  color: #04131f;
  font-size: 9.5px;
  font-weight: 900;
}
.hero h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(50px, 7.2vw, 88px);
  font-weight: 900;
  letter-spacing: clamp(-2px, -.35vw, -3.4px);
  line-height: 1;
}
.hero-subtitle {
  margin: 15px 0 0;
  color: var(--sky-deep);
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 800;
  line-height: 1.4;
}
.hero-lead { max-width: 620px; margin: 12px auto 0; color: var(--muted); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; justify-content: 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: 9px;
  font-size: 14px;
  font-weight: 900;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}
.button-primary { background: var(--ink); color: #eaf6ff; box-shadow: 0 8px 0 #0a1218; }
.button-primary:hover { background: var(--sky); color: #04131f; transform: translateY(-2px); box-shadow: 0 10px 0 #0d6ba9; }
.button-large { min-height: 52px; padding: 0 34px; font-size: 15px; }
.text-link { color: #43586a; border-bottom: 1px dashed #a9c4d8; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--sky-deep); }

.cover-wall {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: 14px;
  max-width: 720px;
  margin: 40px auto 0;
}
.cover-col { display: grid; gap: 14px; }
.cover-col.is-raised { margin-top: -18px; }
.cover-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 4px;
  min-height: 176px;
  padding: 14px 13px;
  border-radius: 12px;
  background: linear-gradient(160deg, #1b9cfc 0%, #0b6fb5 62%, #0a4a7a 100%);
  color: #fff;
  text-align: left;
  box-shadow: 0 16px 30px rgba(11, 92, 148, .22);
  overflow: hidden;
}
.cover-card::before {
  position: absolute;
  top: -26px;
  right: -30px;
  width: 96px;
  height: 96px;
  border: 1px solid rgba(255, 255, 255, .34);
  border-radius: 50%;
  content: "";
}
.cover-card:nth-child(2) { background: linear-gradient(160deg, #2b3f52 0%, #16202a 100%); }
.cover-card.is-next { min-height: 196px; background: linear-gradient(160deg, #37b0ff 0%, #1272b8 58%, #0a3355 100%); }
.cover-card.is-small { min-height: 116px; background: linear-gradient(160deg, #4b6076 0%, #1f2b38 100%); }
.cover-card b { position: relative; font-size: 14px; font-weight: 900; line-height: 1.35; }
.cover-meta { position: relative; color: rgba(255, 255, 255, .78); font-family: var(--mono); font-size: 10px; }
.cover-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  padding: 1px 7px;
  border-radius: 999px;
  background: #fff;
  color: var(--sky-deep);
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 900;
}
.hero-float {
  position: absolute;
  right: max(20px, calc((100% - var(--shell)) / 2));
  bottom: 22px;
  z-index: 3;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 84px;
  height: 84px;
  margin: 0;
  border-radius: 50%;
  background: var(--ink);
  color: #ecf7ff;
  box-shadow: 0 0 0 8px rgba(27, 156, 252, .16), 0 14px 26px rgba(10, 40, 60, .3);
}
.hero-float b { font-family: var(--mono); font-size: 22px; line-height: 1; }
.hero-float span { margin-top: 4px; font-size: 9.5px; letter-spacing: .6px; }

/* features: magazine grid 2-1 / 1-2 */
.features { padding: 74px 0 78px; }
.section-heading { margin-bottom: 28px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(24px, 2.7vw, 33px); font-weight: 900; letter-spacing: -.7px; line-height: 1.32; }
.section-heading > p:last-child { max-width: 600px; margin: 11px 0 0; color: var(--muted); font-size: 14px; }
.section-heading-center { text-align: center; }
.section-heading-center .eyebrow { justify-content: center; }
.section-heading-center > p:last-child { margin-left: auto; margin-right: auto; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(190px, 280px); align-items: end; gap: 26px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px; }
.feature-card {
  position: relative;
  padding: 24px 22px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--white);
}
.feature-card.is-wide { grid-column: span 2; background: var(--paper); }
.feature-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 22px;
  margin-bottom: 12px;
  border-radius: 4px;
  background: var(--ink);
  color: #bfe4ff;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
}
.feature-card h3 { margin: 0 0 7px; font-size: 17.5px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

/* shots: staggered two-column wall */
.shots { padding: 74px 0 82px; border-top: 1px solid var(--line); background: var(--paper); }
.frame-wall { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 16px; align-items: start; }
.frame-card {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  overflow: hidden;
  box-shadow: 0 14px 28px rgba(15, 60, 95, .08);
}
.frame-wall .frame-card:nth-child(even) { margin-top: 40px; }
.frame-card img { width: 100%; height: clamp(300px, 38vw, 460px); object-fit: cover; object-position: top center; border-bottom: 1px solid var(--line); }
.frame-card::after {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 46px;
  height: 54px;
  content: "";
  background: linear-gradient(180deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, .96));
  pointer-events: none;
}
.frame-card figcaption { display: flex; align-items: baseline; gap: 9px; padding: 11px 14px 13px; }
.frame-card figcaption b { color: var(--sky-deep); font-family: var(--mono); font-size: 10px; }
.frame-card figcaption span { display: flex; flex-direction: column; font-size: 13px; font-weight: 800; line-height: 1.45; }
.frame-card figcaption small { color: var(--muted); font-size: 10.5px; font-weight: 500; }

/* faq: bordered list with index rail */
.faq { padding: 72px 0 78px; }
.faq-list { max-width: 860px; margin: 0 auto; display: grid; gap: 9px; }
.faq-list details {
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink);
  border-radius: 8px;
  background: #fff;
  transition: border-color .18s ease, background .18s ease;
}
.faq-list details[open] { border-left-color: var(--sky); background: #fbfdff; }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  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; line-height: 1.5; }
.faq-list summary i {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
}
.faq-list summary i::before,
.faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 9px;
  height: 1.6px;
  content: "";
  background: var(--ink);
  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 { border-color: var(--sky); background: var(--sky-soft); }
.faq-list details[open] summary i::after { transform: translate(-50%, -50%) rotate(0); }
.faq-list details p { padding: 0 18px 15px; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: avatar list */
.reviews { padding: 74px 0 80px; border-top: 1px solid var(--line); background: var(--paper); }
.review-list { display: grid; gap: 10px; padding: 0; margin: 0; list-style: none; }
.review-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}
.review-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--sky-soft);
  color: var(--sky-deep);
  font-size: 15px;
  font-weight: 900;
}
.review-meta { display: flex; align-items: baseline; flex-wrap: wrap; gap: 10px; margin-bottom: 3px; }
.review-meta b { color: var(--ink); font-size: 13px; font-weight: 900; }
.review-meta time { color: #8ea2b4; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #4e6070; font-size: 13px; line-height: 1.8; }

/* steps: 2 + 1 wide */
.steps { padding: 72px 0 78px; }
.step-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; padding: 0; margin: 0; list-style: none; }
.step-list li { position: relative; padding: 22px 22px 20px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.step-list li.is-full { grid-column: 1 / -1; background: var(--ink); border-color: var(--ink); color: #eaf6ff; }
.step-list span {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--sky-deep);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.6px;
}
.step-list li.is-full span { color: #7fd0ff; }
.step-list h3 { margin: 0 0 6px; font-size: 16.5px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.step-list li.is-full p { color: #b8c9d8; }

/* download: centered ink panel with wide button */
.download { padding: 24px 0 30px; }
.download-inner {
  position: relative;
  padding: 46px clamp(20px, 4vw, 46px) 40px;
  border-radius: 14px;
  background:
    radial-gradient(420px 200px at 50% 0%, rgba(27, 156, 252, .34), transparent 74%),
    var(--ink);
  color: #e9f5ff;
  text-align: center;
  overflow: hidden;
}
.download .eyebrow { color: #8fd5ff; justify-content: center; }
.download .eyebrow::before { background: #8fd5ff; }
.download h2 { color: #fff; max-width: 640px; margin: 0 auto; }
.download-inner > p { max-width: 520px; margin: 11px auto 22px; color: #a8bdcf; font-size: 14px; }
.download .button { width: min(100%, 420px); }
.download .button-primary { background: var(--sky); color: #04131f; box-shadow: 0 8px 0 #0d6ba9; }
.download .button-primary:hover { background: #45b4ff; color: #04131f; transform: translateY(2px); box-shadow: 0 6px 0 #0d6ba9; }
.download-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  max-width: 620px;
  padding: 18px 0 0;
  margin: 24px auto 0;
  border-top: 1px solid rgba(255, 255, 255, .16);
  list-style: none;
}
.download-notes li { color: #9fb6c9; font-family: var(--mono); font-size: 10.5px; }
.download-notes li + li { border-left: 1px solid rgba(255, 255, 255, .16); }

/* footer */
.site-footer { padding: 42px 0 52px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px 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: #4a5c6d; font-size: 12px; }
.footer-nav a:hover { color: var(--sky-deep); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 22px; padding-top: 16px; 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: #8ea2b4; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-card.is-wide { grid-column: span 2; }
}
@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: #fff;
    box-shadow: 0 16px 26px rgba(12, 46, 70, .14);
  }
  .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 { padding: 42px 0 96px; }
  .cover-wall { max-width: 100%; margin-top: 32px; }
  .hero-float { width: 70px; height: 70px; right: 14px; bottom: 12px; }
  .hero-float b { font-size: 18px; }
  .section-heading-split { grid-template-columns: 1fr; gap: 10px; }
  .section-heading-split > p:last-child { margin: 0; }
}
@media (max-width: 600px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .brand { font-size: 17px; gap: 8px; }
  .brand img { width: 30px; height: 30px; }
  .brand-tag { display: none; }
  .nav-download { min-height: 36px; padding: 0 11px; font-size: 12px; gap: 6px; box-shadow: 0 4px 0 #0d6ba9; }
  .nav-download svg { width: 16px; height: 16px; }
  .menu-toggle { width: 38px; height: 38px; }
  .hero h1 { font-size: clamp(42px, 13vw, 58px); }
  .cover-wall { gap: 8px; }
  .cover-col { gap: 8px; }
  .cover-card { min-height: 132px; padding: 11px 10px; border-radius: 10px; }
  .cover-card.is-next { min-height: 150px; }
  .cover-card.is-small { min-height: 88px; }
  .cover-card b { font-size: 12px; }
  .cover-badge { top: 8px; right: 8px; font-size: 8.5px; padding: 1px 5px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card.is-wide { grid-column: span 1; }
  .frame-wall { gap: 10px; }
  .frame-wall .frame-card:nth-child(even) { margin-top: 24px; }
  .review-card { grid-template-columns: 34px minmax(0, 1fr); gap: 10px; padding: 14px; }
  .review-avatar { width: 34px; height: 34px; font-size: 13px; }
  .step-list { grid-template-columns: 1fr; }
  .download-notes { grid-template-columns: 1fr; gap: 6px; }
  .download-notes li + li { border-left: 0; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 16px; gap: 7px; }
  .brand img { width: 27px; height: 27px; }
  .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: 40px; }
  .hero-subtitle { font-size: 16px; }
  .button { width: 100%; }
  .ticker-text { font-size: 10.5px; }
}