@charset "UTF-8";

:root {
  --sky: #EAF4FD;
  --sky-2: #DCEDFB;
  --white: #FFFFFF;
  --ink: #16283C;
  --muted: #5C7186;
  --blue: #2F7FD1;
  --blue-deep: #1C5C9E;
  --amber: #F5A623;
  --line: #CFE2F3;
  --shell: 1160px;
  --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(--white);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: anywhere;
}
img { display: block; max-width: 100%; height: auto; }
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(--blue); outline-offset: 4px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 14px; color: var(--blue-deep); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 2.4px; line-height: 1.4; }
.eyebrow::before { width: 9px; height: 9px; border-radius: 50%; content: ""; background: var(--amber); }

/* header */
.site-header { position: sticky; top: 0; z-index: 60; border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .94); 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: 20px; font-weight: 900; letter-spacing: .3px; }
.brand img { width: 38px; height: 38px; border-radius: 10px; object-fit: contain; }
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(12px, 1.8vw, 24px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; border-bottom: 2px solid transparent; color: #51677C; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { border-bottom-color: var(--blue); 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 16px; border-radius: 21px; background: var(--blue); color: #fff; font-size: 13px; font-weight: 900; white-space: nowrap; transition: background .18s ease; }
.nav-download:hover { background: var(--blue-deep); }
.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: sky gradient, copy left, rank board right */
.hero { position: relative; overflow: hidden; background: linear-gradient(180deg, #F3F9FF 0%, var(--sky) 62%, #FFF 100%); border-bottom: 1px solid var(--line); }
.hero::before, .hero::after { position: absolute; content: ""; border-radius: 50%; background: #fff; filter: blur(.4px); pointer-events: none; }
.hero::before { top: 44px; left: -70px; width: 260px; height: 260px; box-shadow: 90px 40px 0 -30px #fff, 170px -14px 0 -60px #fff; opacity: .9; }
.hero::after { right: -60px; bottom: -80px; width: 220px; height: 220px; opacity: .7; }
.hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr); align-items: center; gap: clamp(26px, 4.4vw, 60px); padding: 58px 0 62px; }
.hero-copy { min-width: 0; }
.hero-kicker { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 16px; color: var(--blue-deep); font-family: var(--mono); font-size: 11px; letter-spacing: 1.5px; }
.hero-kicker b { padding: 3px 9px; border-radius: 12px; background: var(--ink); color: #fff; font-size: 9.5px; font-weight: 900; letter-spacing: 1.2px; }
.hero h1 { margin: 0; font-size: clamp(50px, 7.2vw, 90px); font-weight: 900; letter-spacing: clamp(-1px, -.3vw, -3px); line-height: .98; color: var(--ink); }
.hero-subtitle { margin: 16px 0 0; color: var(--blue); font-size: clamp(17px, 2vw, 23px); font-weight: 800; line-height: 1.45; }
.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: 18px; margin-top: 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; gap: 14px; padding: 0 28px; border-radius: 25px; font-size: 14px; font-weight: 900; transition: transform .18s ease, background .18s ease; }
.button-primary { background: var(--blue); color: #fff; box-shadow: 0 14px 26px rgba(47, 127, 209, .28); }
.button-primary:hover { background: var(--blue-deep); transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 36px; font-size: 15px; }
.text-link { color: var(--blue-deep); border-bottom: 1px dashed #9EC3E6; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--amber); }
.hero-chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 30px 0 0; list-style: none; }
.hero-chips li { padding: 6px 16px; border: 1px solid #BFDCF5; border-radius: 16px; background: rgba(255, 255, 255, .8); color: #41698B; font-size: 12px; font-weight: 700; }
.hero-chips li:first-child { border-color: var(--blue); background: var(--blue); color: #fff; }

.rank-panel { min-width: 0; padding: 20px 20px 16px; border: 1px solid #C6DFF4; border-radius: 20px; background: rgba(255, 255, 255, .92); box-shadow: 0 26px 46px rgba(41, 98, 148, .16); }
.rank-head { display: flex; align-items: center; justify-content: space-between; margin: 0 0 6px; font-size: 13px; font-weight: 900; }
.rank-head b { color: var(--blue); font-family: var(--mono); font-size: 10px; font-weight: 700; }
.rank-list { padding: 0; margin: 0; list-style: none; counter-reset: rank; }
.rank-list li { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; align-items: center; gap: 10px; padding: 12px 0; border-top: 1px dashed var(--line); }
.rank-list li > b { color: #B7D3EA; font-family: var(--mono); font-size: 19px; line-height: 1; }
.rank-list li:first-child > b { color: var(--amber); }
.rank-list span { display: flex; flex-direction: column; min-width: 0; }
.rank-list strong { font-size: 14px; font-weight: 900; }
.rank-list small { color: var(--muted); font-size: 11px; }
.rank-list i { padding: 4px 10px; border-radius: 12px; background: #EAF4FD; color: var(--blue-deep); font-size: 10.5px; font-style: normal; font-weight: 800; white-space: nowrap; }
.rank-list li:first-child i { background: var(--blue); color: #fff; }
.rank-foot { padding: 12px 0 0; margin: 0; border-top: 1px solid var(--line); color: #7793AB; font-size: 11.5px; }

/* features: four in a row */
.features { padding: 70px 0 74px; border-bottom: 1px solid var(--line); }
.section-heading { margin-bottom: 30px; }
.section-heading h2 { margin: 0; font-size: clamp(23px, 2.6vw, 33px); font-weight: 900; letter-spacing: -.5px; line-height: 1.35; }
.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(200px, 300px); align-items: end; gap: 24px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.feature-card { position: relative; padding: 22px 18px 20px; border: 1px solid var(--line); border-radius: 16px; background: linear-gradient(180deg, #FFF, #F6FBFF); min-width: 0; }
.feature-card:nth-child(2) { border-top: 3px solid var(--amber); }
.feature-no { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; margin-bottom: 14px; border-radius: 50%; background: var(--sky); color: var(--blue-deep); font-family: var(--mono); font-size: 10px; font-weight: 700; }
.feature-card h3 { margin: 0 0 7px; font-size: 16.5px; font-weight: 900; }
.feature-card p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.75; }

/* shots: four tall cards, staggered */
.shots { padding: 70px 0 82px; background: var(--sky); border-bottom: 1px solid var(--line); }
.shot-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; align-items: start; }
.shot-card { margin: 0; border: 1px solid #C6DFF4; border-radius: 16px; background: #fff; overflow: hidden; box-shadow: 0 16px 30px rgba(41, 98, 148, .1); }
.shot-card:nth-child(even) { margin-top: 26px; }
.shot-card img { width: 100%; height: auto; aspect-ratio: 9 / 16; object-fit: cover; object-position: center 6%; }
.shot-card:nth-child(3) img { object-position: center 78%; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 8px; padding: 10px 13px; border-top: 1px solid var(--line); }
.shot-card figcaption b { color: var(--blue); font-family: var(--mono); font-size: 10px; }
.shot-card figcaption span { display: flex; flex-direction: column; font-size: 12.8px; font-weight: 900; line-height: 1.4; min-width: 0; }
.shot-card figcaption small { color: var(--muted); font-size: 10.5px; font-weight: 500; }

/* faq: single bordered list */
.faq { padding: 70px 0 78px; }
.faq-list { border: 1px solid var(--line); border-radius: 16px; background: #fff; overflow: hidden; }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list details:first-child { border-top: 0; }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 17px 22px; cursor: pointer; list-style: none; background: #F8FCFF; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-size: 15px; font-weight: 900; }
.faq-list summary i { position: relative; flex: none; width: 24px; height: 24px; border-radius: 50%; background: var(--sky); }
.faq-list summary i::before, .faq-list summary i::after { position: absolute; top: 50%; left: 50%; width: 9px; height: 1.5px; content: ""; background: var(--blue); 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: 15px 22px 18px; margin: 0; border-top: 1px dashed var(--line); color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: three columns bubbles */
.reviews { padding: 70px 0 80px; background: var(--sky); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.review-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.review-card { position: relative; padding: 16px 18px 18px; border-radius: 14px; background: #fff; min-width: 0; box-shadow: 0 10px 22px rgba(41, 98, 148, .1); }
.review-card::after { position: absolute; bottom: -8px; left: 26px; width: 16px; height: 16px; content: ""; background: #fff; transform: rotate(45deg); }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.review-meta b { color: var(--blue-deep); font-size: 13px; font-weight: 900; }
.review-meta time { color: #89A3B8; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0 0 6px; color: #40586C; font-size: 12.8px; line-height: 1.78; }

/* steps: horizontal circles */
.steps { padding: 68px 0 74px; }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 0; margin: 26px 0 0; list-style: none; }
.step-list li { display: grid; grid-template-columns: 54px minmax(0, 1fr); align-items: center; gap: 14px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: #F8FCFF; min-width: 0; }
.step-list span { display: inline-flex; align-items: center; justify-content: center; width: 50px; height: 50px; border-radius: 50%; background: var(--blue); color: #fff; font-family: var(--mono); font-size: 16px; font-weight: 700; box-shadow: 0 0 0 6px rgba(47, 127, 209, .12); }
.step-list h3 { margin: 0 0 3px; font-size: 15.5px; font-weight: 900; }
.step-list p { margin: 0; color: var(--muted); font-size: 12.5px; }

/* download: sky banner */
.download { padding: 26px 0; }
.download-inner { position: relative; display: flex; flex-direction: column; align-items: center; overflow: hidden; padding: 46px clamp(22px, 5vw, 56px) 40px; border-radius: 22px; background: linear-gradient(135deg, #4B96DD 0%, #2F7FD1 60%, #2468AA 100%); color: #fff; text-align: center; }
.download-inner::before { position: absolute; top: -70px; left: -50px; width: 220px; height: 220px; border-radius: 50%; content: ""; background: rgba(255, 255, 255, .12); }
.download-inner::after { position: absolute; right: -40px; bottom: -90px; width: 240px; height: 240px; border-radius: 50%; content: ""; background: rgba(255, 255, 255, .08); }
.download .eyebrow { position: relative; z-index: 1; color: #D9ECFC; }
.download .eyebrow::before { background: var(--amber); }
.download h2 { position: relative; z-index: 1; max-width: 620px; margin: 0; font-size: clamp(23px, 2.6vw, 33px); font-weight: 900; letter-spacing: -.5px; line-height: 1.35; }
.download-inner > p { position: relative; z-index: 1; max-width: 520px; margin: 12px 0 22px; color: #D7EBFB; font-size: 14px; }
.download .button-primary { position: relative; z-index: 1; background: #fff; color: var(--blue-deep); box-shadow: 0 14px 26px rgba(12, 52, 88, .28); }
.download .button-primary:hover { background: #EAF4FD; }
.download-notes { position: relative; z-index: 1; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 22px; padding: 18px 0 0; margin: 24px 0 0; border-top: 1px solid rgba(255, 255, 255, .3); list-style: none; }
.download-notes li { color: #D7EBFB; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 7px; content: "·"; color: var(--amber); }

/* footer */
.site-footer { padding: 40px 0 48px; 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: #51677C; font-size: 12px; }
.footer-nav a:hover { color: var(--blue); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; margin-top: 20px; 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: #89A3B8; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1000px) {
  .hero h1 { font-size: clamp(44px, 6vw, 66px); }
  .feature-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .review-list { grid-template-columns: repeat(2, minmax(0, 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: #fff; box-shadow: 0 18px 28px rgba(22, 40, 60, .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-grid { grid-template-columns: 1fr; padding: 42px 0 50px; }
  .hero-copy { order: 1; }
  .rank-panel { order: 2; }
  .steps .step-list { grid-template-columns: 1fr; gap: 12px; }
}
@media (max-width: 768px) {
  .shot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-card:nth-child(even) { margin-top: 0; }
  .review-list { grid-template-columns: 1fr; }
  .review-card::after { display: none; }
  .section-heading-split { grid-template-columns: 1fr; gap: 10px; }
  .section-heading-split > p:last-child { margin: 0; }
  .faq-list summary { padding: 15px 16px; }
  .faq-list details p { padding: 14px 16px 16px; }
}
@media (max-width: 560px) {
  .page-shell, .nav-shell { width: calc(100% - 32px); }
  .hero h1 { font-size: clamp(38px, 11.6vw, 56px); }
  .hero-lead { font-size: 14px; }
  .brand { font-size: 16px; gap: 7px; }
  .brand img { width: 32px; height: 32px; }
  .nav-actions { gap: 8px; }
  .nav-download { min-height: 36px; padding: 0 10px; font-size: 11.5px; gap: 5px; }
  .nav-download svg { width: 14px; height: 14px; }
  .menu-toggle { width: 36px; height: 36px; }
  .feature-row { grid-template-columns: 1fr; }
  .rank-panel { padding: 16px 14px 12px; }
  .rank-list li { grid-template-columns: 30px minmax(0, 1fr) auto; gap: 8px; }
  .download-inner { padding: 38px 20px 32px; }
  .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
}