:root {
  --bg: #F2F7FE;
  --bg-2: #E8F0FB;
  --paper: #FFFFFF;
  --ink: #16233A;
  --muted: #5F7189;
  --line: #D7E3F3;
  --blue: #3B72D9;
  --blue-deep: #24509F;
  --apricot: #F5B347;
  --shadow: 0 18px 44px rgba(22, 35, 58, .08);
  --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:
    radial-gradient(760px 420px at 12% -6%, #FFF6E4 0%, rgba(255, 246, 228, 0) 62%),
    radial-gradient(680px 380px at 92% 4%, #E4EEFF 0%, rgba(228, 238, 255, 0) 60%),
    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(255, 255, 255, .92); backdrop-filter: blur(12px); }
.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: 17px; font-weight: 900; letter-spacing: .2px; }
.brand img { width: 40px; height: 40px; border-radius: 10px; object-fit: contain; background: #fff; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(10px, 1.5vw, 22px); 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(--blue); }
.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: var(--blue); color: #fff; font-size: 12.5px; font-weight: 900; white-space: nowrap; transition: background .18s ease; }
.nav-download:hover { background: var(--blue-deep); }
.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: #fff; 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 { overflow: hidden; }
.hero-grid { 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: 9px; margin: 0 0 16px; padding: 4px 12px 4px 6px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); font-family: var(--mono); font-size: 11px; letter-spacing: 1.4px; }
.hero-kicker b { padding: 2px 8px; border-radius: 999px; background: #FFF1D8; color: #A96E0C; font-size: 10.5px; }
.hero h1 { font-size: clamp(42px, 6vw, 68px); font-weight: 900; letter-spacing: -1.2px; line-height: 1.06; }
.hero-subtitle { margin-top: 14px; color: var(--blue); font-size: clamp(18px, 2.2vw, 23px); font-weight: 800; letter-spacing: .4px; }
.hero-lead { max-width: 30em; margin-top: 16px; color: var(--muted); font-size: 14.5px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; gap: 12px; padding: 0 26px; border: 1px solid transparent; border-radius: 999px; font-size: 14px; font-weight: 900; transition: transform .18s ease, background .18s ease; }
.button-primary { background: var(--blue); color: #fff; box-shadow: 0 12px 26px rgba(59, 114, 217, .26); }
.button-primary:hover { background: var(--blue-deep); transform: translateY(-1px); }
.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 #A9BCD8; padding-bottom: 2px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 28px 0 0; list-style: none; }
.hero-tags li { padding: 6px 14px; border: 1px solid var(--line); border-radius: 8px; background: rgba(255, 255, 255, .8); color: var(--muted); font-size: 12px; }
.hero-tags b { color: var(--ink); }

.lazy-card { padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--paper); box-shadow: var(--shadow); }
.lazy-head { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: 14px; border-bottom: 1px dashed var(--line); }
.lazy-head p { font-size: 13px; font-weight: 800; letter-spacing: 1px; }
.lazy-head b { color: var(--blue); font-family: var(--mono); font-size: 22px; }
.lazy-list { padding: 0; margin: 8px 0 0; list-style: none; }
.lazy-list li { display: grid; grid-template-columns: minmax(0, 1fr) 96px 48px; align-items: center; gap: 12px; padding: 13px 0; border-bottom: 1px dashed var(--line); }
.lazy-list li:last-child { border-bottom: 0; }
.lazy-name b { font-size: 14px; }
.lazy-name small { display: block; color: var(--muted); font-size: 11.5px; }
.lazy-bar { height: 6px; border-radius: 999px; background: var(--bg-2); overflow: hidden; }
.lazy-bar i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--blue), #7EA5E8); }
.lazy-list li:nth-child(2) .lazy-bar i { background: linear-gradient(90deg, var(--apricot), #FFD08A); }
.lazy-list li:nth-child(3) .lazy-bar i { background: linear-gradient(90deg, #59BFA6, #9EDCCB); }
.lazy-list em { padding: 2px 0; border-radius: 4px; background: #EFF6E9; color: #4E7F3B; font-size: 10.5px; font-style: normal; text-align: center; }
.lazy-foot { padding-top: 14px; margin-top: 4px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 11px; }

/* features */
.features { padding: 74px 0 78px; border-block: 1px solid var(--line); background: #fff; }
.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(--blue); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1.8px; }
.eyebrow::before { content: ""; width: 18px; height: 2px; background: var(--blue); }
.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; }

.grid-four { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.cell { position: relative; min-width: 0; padding: 24px 20px 26px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg); transition: transform .18s ease, box-shadow .18s ease; }
.cell:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.cell-no { display: block; margin-bottom: 14px; color: #A9C0E0; font-family: var(--mono); font-size: 22px; font-weight: 700; }
.cell h3 { font-size: 15px; font-weight: 900; }
.cell p { margin-top: 8px; color: var(--muted); font-size: 12.8px; }

/* shots */
.shots { padding: 74px 0 80px; }
.gallery { display: grid; grid-template-columns: minmax(0, 300px) minmax(0, 1fr); gap: 22px; align-items: start; }
.gallery-main, .gallery-side figure { margin: 0; border: 1px solid var(--line); border-radius: 16px; background: var(--paper); overflow: hidden; box-shadow: var(--shadow); }
.gallery-main img { width: 100%; height: auto; }
.gallery-main figcaption, .gallery-side figcaption { display: flex; align-items: baseline; gap: 10px; padding: 12px 14px; border-top: 1px solid var(--line); font-size: 13px; font-weight: 900; }
.gallery-main figcaption b, .gallery-side figcaption b { color: var(--blue); font-family: var(--mono); font-size: 11px; }
.gallery-main figcaption small, .gallery-side figcaption small { color: var(--muted); font-size: 11.5px; font-weight: 400; }
.gallery-side { display: grid; gap: 14px; }
.gallery-side figure { display: grid; grid-template-columns: 108px minmax(0, 1fr); align-items: center; }
.gallery-side img { width: 108px; height: auto; border-right: 1px solid var(--line); }
.gallery-side figcaption { flex-direction: column; align-items: flex-start; gap: 2px; border-top: 0; padding: 0 16px; }
.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: var(--bg-2); }
.qa-list { display: grid; gap: 10px; }
.qa-list details { border: 1px solid #C9DCF5; border-radius: 12px; background: #fff; }
.qa-list summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 15px 18px; cursor: pointer; list-style: none; }
.qa-list summary::-webkit-details-marker { display: none; }
.qa-list summary h3 { font-size: 14.5px; font-weight: 900; }
.qa-list summary i { position: relative; flex: none; width: 20px; height: 20px; border-radius: 50%; background: #EAF2FE; }
.qa-list summary i::before, .qa-list summary i::after { content: ""; position: absolute; top: 9px; left: 5px; width: 10px; height: 2px; background: var(--blue); transition: transform .18s ease; }
.qa-list summary i::after { transform: rotate(90deg); }
.qa-list details[open] summary i::after { transform: rotate(0deg); }
.qa-list details p { padding: 0 18px 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: 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(--paper); }
.review-card > p { color: #33445C; 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 dashed var(--line); font-size: 11.5px; }
.review-meta b { color: var(--blue); font-weight: 800; }
.review-meta time { color: var(--muted); font-family: var(--mono); font-size: 10.8px; }

/* steps */
.steps { padding: 74px 0 80px; border-block: 1px solid var(--line); background: #fff; }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; counter-reset: st; }
.step-list li { position: relative; min-width: 0; padding: 24px 22px 26px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg); }
.step-list li::before { counter-increment: st; content: "0" counter(st); position: absolute; top: 18px; right: 20px; color: #BAD0EC; font-family: var(--mono); font-size: 26px; font-weight: 700; line-height: 1; }
.step-list span { display: inline-block; margin-bottom: 26px; color: var(--blue); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: 1.4px; }
.step-list h3 { font-size: 15px; font-weight: 900; }
.step-list p { margin-top: 8px; color: var(--muted); font-size: 12.8px; }

/* download */
.download { padding: 66px 0 72px; background: linear-gradient(160deg, #1B3A63 0%, #12294A 100%); }
.download-panel { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 28px; padding: 36px; border: 1px solid rgba(255, 255, 255, .12); border-radius: 18px; background: rgba(255, 255, 255, .05); }
.download-copy .eyebrow { color: #9DC0F2; }
.download-copy .eyebrow::before { background: #9DC0F2; }
.download-copy h2 { margin-top: 10px; color: #fff; font-size: clamp(24px, 3vw, 32px); font-weight: 900; letter-spacing: -.3px; }
.download-copy p { margin-top: 10px; color: #AFC6E4; font-size: 13px; }
.download-act { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.download .button-primary { background: #fff; color: #16304F; box-shadow: none; }
.download .button-primary:hover { background: #EAF2FE; }
.download-notes { display: flex; flex-wrap: wrap; gap: 8px 16px; padding: 0; margin: 0; list-style: none; color: #9FB8D8; font-family: var(--mono); font-size: 11px; }

/* footer */
.site-footer { padding: 46px 0 36px; border-top: 1px solid var(--line); background: #fff; }
.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(--blue); }
.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: #8B9AAE; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; padding: 48px 0 52px; }
  .lazy-card { max-width: 520px; }
  .grid-four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery { grid-template-columns: minmax(0, 260px) minmax(0, 1fr); }
  .review-grid { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; }
  .download-panel { flex-direction: column; align-items: flex-start; }
  .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: #fff; }
  .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: 640px) {
  .page-shell, .nav-shell { width: calc(100% - 34px); }
  .brand { font-size: 15px; }
  .nav-download { padding: 0 12px; }
  .nav-download span { font-size: 12px; }
  .hero h1 { font-size: 40px; }
  .hero-subtitle { font-size: 17px; }
  .gallery { grid-template-columns: 1fr; }
  .gallery-side figure { grid-template-columns: 92px minmax(0, 1fr); }
  .gallery-side img { width: 92px; }
  .grid-four { grid-template-columns: 1fr; }
  .lazy-list li { grid-template-columns: minmax(0, 1fr) 72px 44px; }
  .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; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}