:root {
  --bg: #f7f8f5;
  --surface: #ffffff;
  --surface-alt: #eef4f1;
  --ink: #17201f;
  --muted: #5e6b67;
  --line: #dce5e0;
  --brand: #0f766e;
  --brand-strong: #075e58;
  --accent: #b7791f;
  --accent-soft: #fff2d7;
  --danger: #a23b3b;
  --radius: 8px;
  --shadow: 0 18px 45px rgba(23, 32, 31, 0.12);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.65;
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  color: var(--brand-strong);
}

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 248, 245, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand img {
  width: 38px;
  height: 38px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 10px 13px;
  border-radius: 6px;
  color: #2f3a38;
  font-size: 15px;
}

.nav-links a[aria-current="page"],
.nav-links a:hover {
  background: var(--surface-alt);
  color: var(--brand-strong);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn,
button.btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover,
button.btn:hover {
  background: var(--brand-strong);
  color: #fff;
}

.btn.secondary {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}

.btn.secondary:hover {
  border-color: var(--brand);
  color: var(--brand-strong);
}

.btn.warning {
  background: var(--accent);
}

.btn.warning:hover {
  background: #945f18;
}

.icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.hero {
  padding: 74px 0 42px;
  background:
    linear-gradient(180deg, rgba(238, 244, 241, 0.95), rgba(247, 248, 245, 1)),
    linear-gradient(90deg, rgba(15, 118, 110, 0.12), rgba(183, 121, 31, 0.1));
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, 0.98fr);
  gap: 28px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--brand-strong);
  font-size: 14px;
  font-weight: 700;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--accent);
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  line-height: 1.18;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(36px, 5.2vw, 64px);
}

h2 {
  font-size: 34px;
}

h3 {
  font-size: 21px;
}

.lead {
  margin: 22px 0 0;
  max-width: 700px;
  color: #42504d;
  font-size: 19px;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-meta {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.meta-box {
  padding: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  border-radius: var(--radius);
}

.meta-box strong {
  display: block;
  font-size: 18px;
}

.meta-box span {
  color: var(--muted);
  font-size: 13px;
}

.screenshot-frame {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.screenshot-head {
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  background: #eef4f1;
  border-bottom: 1px solid var(--line);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #9aa8a4;
}

.dot:nth-child(2) {
  background: var(--accent);
}

.dot:nth-child(3) {
  background: var(--brand);
}

.screenshot-caption {
  padding: 14px 16px;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--line);
}

.section {
  padding: 76px 0;
}

.section.alt {
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 28px;
}

.section-head p {
  max-width: 650px;
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.card .card-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  margin-bottom: 17px;
  border-radius: 7px;
  color: var(--brand-strong);
  background: var(--surface-alt);
}

.card p,
.copy p,
.timeline p,
.notice p,
.feature-row p {
  color: var(--muted);
}

.card p:last-child,
.copy p:last-child {
  margin-bottom: 0;
}

.feature-row {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.feature-row:last-child {
  border-bottom: 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: #394743;
  font-size: 13px;
}

.download-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 22px;
}

.version-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}

.version-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.version-line strong {
  font-size: 30px;
}

.code {
  display: block;
  padding: 14px 16px;
  overflow-x: auto;
  background: #15211f;
  color: #e8f2ef;
  border-radius: 6px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 14px;
}

.notice {
  border-left: 4px solid var(--accent);
  padding: 18px 20px;
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.danger {
  border-left-color: var(--danger);
  background: #fff0f0;
}

.timeline {
  display: grid;
  gap: 14px;
}

.step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  align-items: start;
}

.step-num {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-alt);
  color: #293532;
}

tr:last-child td {
  border-bottom: 0;
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
}

summary {
  cursor: pointer;
  padding: 18px 20px;
  font-weight: 700;
}

details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--muted);
}

.breadcrumb {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--muted);
}

.cta-band {
  padding: 46px 0;
  background: #17302d;
  color: #e8f2ef;
}

.cta-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.cta-band h2 {
  color: #fff;
}

.cta-band p {
  max-width: 700px;
  margin: 12px 0 0;
  color: #c7d7d2;
}

.site-footer {
  padding: 38px 0;
  background: #101816;
  color: #c5d0cc;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 0.9fr;
  gap: 24px;
}

.site-footer a {
  color: #dbe8e4;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.small {
  color: var(--muted);
  font-size: 14px;
}

.site-footer .small {
  color: #9fb0ab;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 22px;
}

.modal.is-open {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 18, 17, 0.68);
}

.modal-dialog {
  position: relative;
  width: min(820px, 100%);
  max-height: min(760px, calc(100vh - 44px));
  overflow: auto;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.modal-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  padding: 24px;
  border-bottom: 1px solid var(--line);
}

.modal-head p {
  margin: 8px 0 0;
  color: var(--muted);
}

.modal-close {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 24px;
}

.qr-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
}

.qr-card img {
  width: 172px;
  height: 172px;
  margin: 0 auto 14px;
}

.qr-card p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.modal-foot {
  padding: 0 24px 24px;
}

.modal-foot .notice {
  margin: 0;
}

@media (max-width: 980px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero-grid,
  .download-panel,
  .grid.three,
  .grid.two,
  .footer-grid,
  .cta-band .container {
    grid-template-columns: 1fr;
  }

  .hero-grid,
  .download-panel {
    gap: 28px;
  }

  .cta-band .container {
    display: grid;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

  .section {
    padding: 54px 0;
  }

  .section-head,
  .feature-row,
  .version-line {
    display: grid;
    grid-template-columns: 1fr;
  }

  .hero-meta,
  .qr-grid {
    grid-template-columns: 1fr;
  }

  .nav-actions,
  .hero-actions {
    width: 100%;
  }

  .btn,
  button.btn {
    width: 100%;
  }
}