@charset "UTF-8";

:root {
  --green: #2e7d5b;
  --green-deep: #1f5c42;
  --green-soft: #e7f3ec;
  --tint: #f4fbf7;
  --ink: #16241e;
  --muted: #61756b;
  --line: #d9e8df;
  --white: #ffffff;
  --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: 1.7;
}
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(--green); outline-offset: 3px; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 12px;
  padding: 4px 12px 4px 10px;
  border-radius: 999px;
  background: var(--green-soft);
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 1.8px;
  line-height: 1.5;
}
.eyebrow::before { width: 6px; height: 6px; border-radius: 50%; content: ""; background: var(--green); }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .96);
  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: -.6px; }
.brand img { width: 36px; height: 36px; border-radius: 50%; object-fit: contain; }
.brand-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 21px;
  height: 21px;
  border-radius: 5px;
  background: var(--green-soft);
  color: var(--green-deep);
  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, 26px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { display: block; padding: 7px 0; color: #4d635a; font-size: 13px; font-weight: 700; }
.primary-nav a:hover { color: var(--green); }
.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(--green);
  border-radius: 999px;
  background: var(--green);
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  white-space: nowrap;
  transition: background .18s ease, color .18s ease;
}
.nav-download:hover { background: #fff; color: var(--green); }
.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: 50%; 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: copy left + two flip cards right + page dots */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(46, 125, 91, .05) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(180deg, rgba(46, 125, 91, .05) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(180deg, #f6fcf8, #ffffff 78%);
}
.hero::before {
  position: absolute;
  top: -140px;
  right: -80px;
  width: 460px;
  height: 460px;
  border: 1px solid rgba(46, 125, 91, .16);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(280px, .98fr);
  align-items: center;
  gap: clamp(26px, 4vw, 56px);
  padding: 62px 0 66px;
}
.hero-copy { min-width: 0; }
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  color: #52685e;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.2px;
}
.hero-kicker b {
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--ink);
  color: #eaf6ef;
  font-size: 9.5px;
  font-weight: 900;
  letter-spacing: 1.4px;
}
.hero h1 {
  margin: 0;
  color: #123328;
  font-size: clamp(50px, 7vw, 86px);
  font-weight: 900;
  letter-spacing: clamp(-2px, -.35vw, -3.5px);
  line-height: 1.02;
}
.hero-subtitle {
  margin: 18px 0 0;
  color: var(--green);
  font-size: clamp(18px, 2vw, 23px);
  font-weight: 800;
  line-height: 1.4;
}
.hero-lead { max-width: 500px; margin: 13px 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: 12px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 900;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}
.button-primary { background: var(--green); color: #fff; box-shadow: 0 14px 28px rgba(46, 125, 91, .24); }
.button-primary:hover { background: var(--green-deep); transform: translateY(-2px); }
.button-large { min-height: 54px; padding: 0 32px; font-size: 15px; }
.text-link { color: #40564c; border-bottom: 1px dashed #a8c6b7; font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 5px; color: var(--green); }

.hero-reader { min-width: 0; }
.flip-stage { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; align-items: start; }
.flip-card {
  position: relative;
  padding: 18px 17px 15px;
  border: 1px solid var(--line);
  border-radius: 18px 18px 8px 8px;
  background: #fff;
  box-shadow: 0 20px 40px rgba(31, 92, 66, .1);
  overflow: hidden;
}
.flip-card::after {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34px;
  height: 34px;
  content: "";
  background: linear-gradient(135deg, #eef7f1 0 50%, #d6e9dd 50% 100%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}
.flip-card.is-under { margin-top: 26px; background: #fbfefc; }
.flip-index {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--green-soft);
  color: var(--green-deep);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .6px;
}
.flip-title { margin: 11px 0 14px; font-size: 15px; font-weight: 900; line-height: 1.4; }
.flip-line { display: block; height: 8px; margin-bottom: 9px; border-radius: 4px; background: linear-gradient(90deg, #e7f2ec, #f6fbf8); }
.flip-foot { margin: 14px 0 0; color: #8ba296; font-family: var(--mono); font-size: 10.5px; }
.flip-foot b { color: var(--green); font-size: 13px; }
.page-dots { display: flex; justify-content: center; gap: 9px; margin: 30px 0 0; }
.page-dots i { width: 7px; height: 7px; border-radius: 50%; background: #cfe3d7; }
.page-dots i.is-on { width: 22px; border-radius: 999px; background: var(--green); }

/* features: 2x2 */
.features { padding: 76px 0 80px; border-bottom: 1px solid var(--line); }
.section-heading { margin-bottom: 30px; }
.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-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(200px, 290px); align-items: end; gap: 26px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
.feature-card {
  position: relative;
  padding: 26px 24px 24px 74px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--tint);
}
.feature-no {
  position: absolute;
  top: 24px;
  left: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--green);
  font-family: var(--mono);
  font-size: 12px;
  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: four frames in a row */
.shots { padding: 76px 0 82px; border-bottom: 1px solid var(--line); background: var(--tint); }
.frame-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 13px; align-items: start; }
.frame-card {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  overflow: hidden;
  box-shadow: 0 12px 26px rgba(31, 92, 66, .07);
}
.frame-card img { width: 100%; height: auto; aspect-ratio: 9 / 17; object-fit: cover; object-position: top center; border-bottom: 1px solid var(--line); }
.frame-card figcaption { display: flex; align-items: baseline; gap: 9px; padding: 11px 13px 13px; }
.frame-card figcaption b { color: var(--green); 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: card stack */
.faq { padding: 74px 0 80px; }
.faq-layout { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(24px, 4vw, 52px); }
.faq-heading { align-self: start; }
.faq-list { display: grid; gap: 10px; }
.faq-list details { border: 1px solid var(--line); border-radius: 12px; background: #fff; transition: border-color .18s ease, box-shadow .18s ease; }
.faq-list details[open] { border-color: #b8d8c6; box-shadow: 0 12px 26px rgba(31, 92, 66, .08); }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 17px;
  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: 20px; height: 20px; border-radius: 50%; background: var(--green-soft); }
.faq-list summary i::before,
.faq-list summary i::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 1.5px;
  content: "";
  background: var(--green);
  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 17px 16px; margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.85; }

/* reviews: two columns */
.reviews { padding: 74px 0 80px; border-top: 1px solid var(--line); background: var(--tint); }
.review-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; padding: 0; margin: 0; list-style: none; }
.review-card { padding: 20px 20px 18px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.review-meta { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 6px; padding-bottom: 9px; margin-bottom: 9px; border-bottom: 1px dashed var(--line); }
.review-meta b { color: var(--green-deep); font-size: 13px; font-weight: 900; }
.review-meta time { color: #8ba296; font-family: var(--mono); font-size: 10px; }
.review-card p { margin: 0; color: #4c6157; font-size: 13px; line-height: 1.8; }

/* steps: three across with dashed rail */
.steps { padding: 72px 0 78px; }
.step-list {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.step-list::before {
  position: absolute;
  top: 22px;
  left: 8%;
  right: 8%;
  border-top: 1px dashed #b9d6c6;
  content: "";
}
.step-list li { position: relative; padding: 54px 20px 22px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.step-list span {
  position: absolute;
  top: 10px;
  left: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 26px;
  border-radius: 6px;
  background: var(--green);
  color: #fff;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}
.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; }

/* download: left copy + right action panel */
.download { padding: 24px 0 30px; }
.download-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 300px);
  align-items: center;
  gap: 26px;
  padding: 44px clamp(22px, 4vw, 48px);
  border-radius: 18px;
  background: linear-gradient(120deg, #2e7d5b, #1d5c41 88%);
  color: #eef8f2;
}
.download .eyebrow { background: rgba(255, 255, 255, .16); color: #dff2e8; }
.download .eyebrow::before { background: #b7f0d0; }
.download h2 { color: #fff; }
.download-copy > p { max-width: 460px; margin: 11px 0 0; color: #cfe7da; font-size: 14px; }
.download-notes { display: flex; flex-wrap: wrap; gap: 6px 20px; padding: 18px 0 0; margin: 18px 0 0; border-top: 1px solid rgba(255, 255, 255, .22); list-style: none; }
.download-notes li { color: #d3eadd; font-family: var(--mono); font-size: 11px; }
.download-notes li::before { margin-right: 7px; content: "+"; color: #a9e8c3; }
.download-action { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.download-action .button-primary { background: #fff; color: var(--green-deep); box-shadow: 0 14px 26px rgba(8, 40, 26, .28); }
.download-action .button-primary:hover { background: #eafaf1; }
.download-hint { margin: 0; color: #b9dccb; font-size: 11.5px; }

/* 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: #52685e; font-size: 12px; }
.footer-nav a:hover { color: var(--green); }
.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: #8ba296; font-size: 11.5px; line-height: 1.8; }

/* responsive */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; }
  .frame-row { 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 16px 26px rgba(20, 60, 42, .12);
  }
  .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: 46px 0 52px; }
  .hero-reader { max-width: 460px; }
  .faq-layout { grid-template-columns: 1fr; }
  .step-list { grid-template-columns: 1fr; }
  .step-list::before { display: none; }
  .download-inner { grid-template-columns: 1fr; }
}
@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: 38px; padding: 0 12px; font-size: 12px; gap: 6px; }
  .nav-download svg { width: 16px; height: 16px; }
  .menu-toggle { width: 38px; height: 38px; }
  .hero h1 { font-size: clamp(42px, 13vw, 58px); }
  .flip-stage { gap: 8px; }
  .flip-card { padding: 13px 11px 12px; border-radius: 14px 14px 6px 6px; }
  .flip-card.is-under { margin-top: 18px; }
  .flip-title { margin: 8px 0 10px; font-size: 12.5px; }
  .flip-line { height: 6px; margin-bottom: 7px; }
  .flip-foot { margin-top: 10px; font-size: 9.5px; }
  .flip-foot b { font-size: 11px; }
  .page-dots { margin-top: 22px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 22px 18px 20px 66px; }
  .frame-row { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .section-heading-split { grid-template-columns: 1fr; gap: 10px; }
  .section-heading-split > p:last-child { margin: 0; }
  .review-list { grid-template-columns: 1fr; }
  .download-notes li { font-size: 10.5px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .brand { font-size: 16px; gap: 7px; }
  .brand img { width: 28px; height: 28px; }
  .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%; }
}