:root {
  --bg: #f6f6f1;
  --paper: #ffffff;
  --ink: #12211c;
  --muted: #5d6f68;
  --accent: #14503f;
  --accent-2: #e8b44a;
  --accent-soft: #e8f0eb;
  --line: #dde5df;
  --radius: 12px;
  --shell: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(20, 80, 63, 0.06), transparent 380px),
    var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { margin: 0; line-height: 1.3; font-weight: 700; }

.page-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(246, 246, 241, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  white-space: nowrap;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  object-fit: cover;
}

.primary-nav { margin-left: auto; }

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14.5px;
  color: var(--muted);
}

.primary-nav a {
  padding: 5px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.primary-nav a:hover {
  color: var(--accent);
  border-color: var(--accent-2);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 17px;
  border-radius: 8px;
  background: var(--accent);
  color: #f7f4e8;
  font-size: 14.5px;
  font-weight: 700;
  transition: background 0.18s ease;
}

.nav-download svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-download:hover { background: #0d3a2e; }

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--paper);
  cursor: pointer;
  padding: 0;
  place-items: center;
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 3px auto;
  border-radius: 2px;
  background: var(--ink);
}

/* ---------- hero ---------- */
.hero {
  padding: 56px 0 50px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  gap: 42px;
  align-items: center;
}

.hero-kicker {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--accent);
  border-bottom: 2px solid var(--accent-2);
  padding-bottom: 3px;
}

.hero h1 {
  margin: 16px 0 10px;
  font-size: clamp(34px, 4.6vw, 52px);
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 700;
  color: var(--accent);
}

.hero-lead {
  margin-top: 16px;
  max-width: 470px;
  color: var(--muted);
  font-size: 15.5px;
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: 9px;
  font-weight: 700;
  font-size: 15.5px;
  transition: transform 0.18s ease, background 0.18s ease;
}

.button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-primary {
  background: var(--accent);
  color: #f7f4e8;
  box-shadow: 0 10px 22px rgba(20, 80, 63, 0.22);
}

.button-primary:hover {
  transform: translateY(-2px);
  background: #0d3a2e;
}

.button-large { padding: 15px 30px; font-size: 16.5px; }

.text-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--muted);
  border-bottom: 1px dashed #bcc9c1;
  padding-bottom: 2px;
}

.text-link:hover { color: var(--accent); }

.hero-tags {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
}

.hero-tags li {
  padding: 4px 12px;
  border-radius: 6px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.hero-tags b { color: #a97c1a; }

/* ---------- hero dual pane ---------- */
.dual-pane {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 10px;
  padding: 12px;
  background: #101c18;
  border-radius: 14px;
  box-shadow: 0 20px 44px rgba(18, 33, 28, 0.28);
}

.pane {
  background: #172822;
  border: 1px solid #26443a;
  border-radius: 9px;
  overflow: hidden;
}

.pane-right { border-color: #3d4a2c; }

.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  font-size: 12px;
  color: #b9cdc2;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid #26443a;
}

.pane-head em {
  font-style: normal;
  font-size: 11px;
  color: #7f9a8c;
}

.pane-tree { padding: 6px; display: grid; gap: 2px; }

.pane-tree li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 5px;
  font-size: 12.5px;
  color: #dfeae4;
}

.pane-tree li.is-active {
  background: rgba(232, 180, 74, 0.16);
  color: #ffdf9e;
}

.pane-tree em {
  font-style: normal;
  font-size: 10.5px;
  color: #7f9a8c;
}

.pane-foot {
  grid-column: 1 / -1;
  padding: 8px 12px 2px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: #9db3a7;
}

/* ---------- section shared ---------- */
section { padding: 52px 0; }

.section-heading {
  max-width: 660px;
  margin-bottom: 28px;
}

.section-heading .eyebrow {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: #a97c1a;
  margin-bottom: 10px;
}

.section-heading .eyebrow::before {
  content: "— ";
}

.section-heading h2 { font-size: clamp(23px, 2.8vw, 31px); }

.section-heading p:last-child {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14.5px;
}

.section-heading-split {
  max-width: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 26px;
}

.section-heading-split > p {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 13.5px;
  white-space: nowrap;
}

/* ---------- features ---------- */
.features {
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.ledger-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.ledger-grid article {
  position: relative;
  padding: 22px 26px 22px 64px;
  border-bottom: 1px solid var(--line);
}

.ledger-grid article:nth-child(odd) { border-right: 1px solid var(--line); }

.ledger-grid span {
  position: absolute;
  left: 20px;
  top: 22px;
  font-size: 12px;
  font-weight: 800;
  color: var(--accent-2);
}

.ledger-grid h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.ledger-grid p {
  font-size: 13.8px;
  color: var(--muted);
}

/* ---------- shots ---------- */
.strip-shots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.strip-shots figure {
  margin: 0;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.strip-shots img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
}

.strip-shots figcaption {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 13px 12px;
  font-size: 13.5px;
  font-weight: 700;
  border-top: 2px solid var(--accent-2);
}

.strip-shots figcaption b {
  font-size: 11.5px;
  color: var(--accent);
}

.strip-shots figcaption small {
  margin-left: auto;
  font-weight: 400;
  font-size: 11.5px;
  color: var(--muted);
}

.sample-note {
  margin-top: 16px;
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- faq ---------- */
.faq { background: #eef1ec; }

.faq-ledger {
  display: grid;
  gap: 0;
  border-top: 1px solid #cdd8d0;
}

.faq-ledger details {
  border-bottom: 1px solid #cdd8d0;
  padding: 0 4px;
}

.faq-ledger summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}

.faq-ledger summary::-webkit-details-marker { display: none; }

.faq-ledger summary h3 {
  flex: 1;
  font-size: 15.8px;
}

.faq-ledger summary i {
  position: relative;
  flex: none;
  width: 22px;
  height: 22px;
  border: 1px solid #b6c5ba;
  border-radius: 50%;
}

.faq-ledger summary i::before,
.faq-ledger summary i::after {
  content: "";
  position: absolute;
  background: var(--accent);
  border-radius: 1px;
}

.faq-ledger summary i::before {
  left: 6px;
  right: 6px;
  top: 10px;
  height: 1.5px;
}

.faq-ledger summary i::after {
  top: 6px;
  bottom: 6px;
  left: 10px;
  width: 1.5px;
}

.faq-ledger details[open] summary i::after { display: none; }

.faq-ledger details > p {
  padding: 0 0 16px 36px;
  font-size: 14.2px;
  color: var(--muted);
  max-width: 800px;
}

/* ---------- reviews ---------- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.review-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.review-card p {
  font-size: 14px;
  color: #33463f;
}

.review-meta {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
  color: var(--muted);
}

.review-meta b {
  font-size: 12.5px;
  color: var(--accent);
}

/* ---------- steps ---------- */
.steps { border-top: 1px solid var(--line); background: var(--paper); }

.step-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.step-row li {
  padding: 20px;
  border-left: 3px solid var(--accent);
  background: #f7faf7;
  border-radius: 0 8px 8px 0;
}

.step-row span {
  font-size: 11px;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: #a97c1a;
}

.step-row h3 {
  margin: 7px 0 5px;
  font-size: 18px;
}

.step-row p {
  font-size: 13.8px;
  color: var(--muted);
}

/* ---------- download ---------- */
.download { padding-bottom: 66px; }

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
  padding: 34px;
  border-radius: 14px;
  background: #101c18;
  color: #eaf2ed;
}

.download-copy { max-width: 520px; }

.download-copy .eyebrow {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--accent-2);
  margin-bottom: 10px;
}

.download-copy h2 { font-size: clamp(22px, 2.6vw, 29px); }

.download-copy p:last-child {
  margin-top: 10px;
  font-size: 14.2px;
  color: #a9bdb2;
}

.download-act {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  flex: none;
}

.download-act .button-primary {
  background: var(--accent-2);
  color: #211603;
  box-shadow: 0 10px 24px rgba(232, 180, 74, 0.22);
}

.download-act .button-primary:hover { background: #f2c463; }

.download-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 12.5px;
  color: #9db3a7;
}

.download-notes li::before {
  content: "· ";
  color: var(--accent-2);
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: #0c1512;
  color: #c2d1c9;
  padding: 40px 0 46px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 26px;
  align-items: start;
}

.footer-brand strong { font-size: 17px; }

.footer-brand p {
  margin-top: 6px;
  font-size: 13px;
  color: #7d9187;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13.5px;
  color: #9fb2a8;
}

.footer-nav a:hover { color: #fff; }

.footer-meta {
  font-size: 13px;
  color: #7d9187;
  text-align: right;
}

.footer-meta a {
  display: inline-block;
  margin-top: 6px;
  border-bottom: 1px dashed #2b3d35;
}

.disclaimer {
  grid-column: 1 / -1;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid #1f3029;
  font-size: 12.5px;
  color: #70857a;
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .hero-grid { gap: 28px; }
  .strip-shots { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .review-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-meta { text-align: left; }
}

@media (max-width: 860px) {
  .primary-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #f6f6f1;
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
  }

  .primary-nav.is-open { display: block; }

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    font-size: 15px;
  }

  .primary-nav ul li { width: 100%; }

  .primary-nav a {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
  }

  .menu-toggle { display: grid; }

  .hero { padding: 36px 0 34px; }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .dual-pane { max-width: 520px; }

  .ledger-grid { grid-template-columns: minmax(0, 1fr); }
  .ledger-grid article:nth-child(odd) { border-right: 0; }

  .download-panel {
    flex-direction: column;
    align-items: flex-start;
    padding: 26px 22px;
  }

  .footer-grid { grid-template-columns: 1fr; gap: 18px; }
  .section-heading-split { flex-direction: column; align-items: flex-start; gap: 8px; }
  .section-heading-split > p { white-space: normal; }
}

@media (max-width: 560px) {
  .page-shell { padding: 0 18px; }
  .nav-shell { padding: 10px 18px; gap: 10px; }
  .nav-download span { display: none; }
  .nav-download { padding: 9px 12px; }
  .hero h1 { font-size: 36px; }
  .strip-shots { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .review-grid { grid-template-columns: minmax(0, 1fr); }
  .step-row { grid-template-columns: minmax(0, 1fr); }
  .faq-ledger details > p { padding-left: 0; }
  .dual-pane { grid-template-columns: minmax(0, 1fr); }
  .download-notes { flex-direction: column; gap: 6px; }
  section { padding: 42px 0; }
}