:root {
  --bg: #f5f7f8;
  --surface: #ffffff;
  --surface-2: #eef2f1;
  --ink: #0b0d0f;
  --text: #1e2a2f;
  --muted: #607078;
  --line: #dce4e2;
  --accent: #18b875;
  --accent-2: #0f8f5a;
  --accent-soft: #dff7ec;
  --dark: #101416;
  --dark-2: #171d20;
  --white: #ffffff;
  --shadow: 0 18px 45px rgba(15, 24, 28, 0.11);
  --radius: 8px;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
  color: var(--ink);
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

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

.nav-links a {
  padding: 10px 13px;
  border-radius: 6px;
  color: #39474d;
  font-size: 14px;
  font-weight: 650;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--accent-soft);
  color: #076b43;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  padding: 12px 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 750;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #052417;
  box-shadow: 0 12px 28px rgba(24, 184, 117, 0.25);
}

.btn-primary:hover {
  background: #2cd487;
}

.btn-secondary {
  background: #111719;
  color: var(--white);
}

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

.hero {
  background: linear-gradient(180deg, #ffffff 0%, #f4f8f6 100%);
  padding: 76px 0 58px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 48px;
  align-items: center;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  color: var(--ink);
  line-height: 1.08;
  font-size: clamp(38px, 6vw, 70px);
  letter-spacing: 0;
}

.hero p {
  margin: 22px 0 0;
  max-width: 640px;
  color: #425159;
  font-size: 18px;
}

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

.hero-proof {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

.proof-item {
  border-left: 3px solid var(--accent);
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.65);
}

.proof-item strong {
  display: block;
  color: var(--ink);
  font-size: 19px;
}

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

.hero-visual {
  position: relative;
}

.screenshot-frame {
  background: #111719;
  border: 1px solid #273135;
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 10px;
}

.screenshot-frame img {
  width: 100%;
  border-radius: 6px;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.metric-strip div {
  background: #111719;
  color: #dcefe7;
  border-radius: 8px;
  padding: 14px;
}

.metric-strip strong {
  display: block;
  color: #fff;
  font-size: 22px;
}

.section {
  padding: 74px 0;
}

.section-dark {
  background: var(--dark);
  color: #edf7f3;
}

.section-muted {
  background: var(--surface-2);
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head h2,
.split h2,
.content h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-dark .section-head h2,
.section-dark .split h2 {
  color: #fff;
}

.section-head p,
.split p,
.content p {
  margin: 14px 0 0;
  color: var(--muted);
}

.section-dark .section-head p,
.section-dark .split p {
  color: #b7c7c1;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 8px 26px rgba(16, 24, 27, 0.05);
}

.card h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 20px;
}

.card p,
.card li {
  color: #516169;
}

.icon {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  border-radius: 8px;
  background: #101416;
  color: var(--accent);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 44px;
  align-items: center;
}

.scenario-list {
  display: grid;
  gap: 14px;
}

.scenario {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 16px;
  align-items: center;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scenario b {
  color: var(--ink);
}

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

.dial {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) var(--value), #dbe5e2 0);
  display: grid;
  place-items: center;
}

.dial::after {
  content: "";
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
}

.quote-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 22px;
}

.quote {
  min-height: 100%;
  padding: 28px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
}

.quote p {
  margin: 0;
  color: #28353b;
  font-size: 18px;
}

.quote cite {
  display: block;
  margin-top: 18px;
  color: var(--muted);
  font-style: normal;
  font-weight: 700;
}

.page-hero {
  padding: 62px 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.page-hero p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.content {
  padding: 58px 0;
}

.content ul,
.content ol {
  padding-left: 22px;
}

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

.feature-row h2 {
  font-size: 28px;
}

.step-list {
  counter-reset: steps;
  display: grid;
  gap: 16px;
}

.step {
  position: relative;
  padding: 22px 22px 22px 70px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute;
  left: 22px;
  top: 22px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--accent);
  color: #052417;
  font-weight: 800;
}

.download-panel {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 22px;
  align-items: start;
}

.release-box {
  background: #111719;
  color: #eaf8f1;
  border-radius: var(--radius);
  padding: 28px;
}

.release-box h2 {
  color: #fff;
  margin: 0;
}

.release-box p {
  color: #b7c7c1;
}

.download-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.download-table th {
  background: #edf4f1;
  color: var(--ink);
}

.tag {
  display: inline-flex;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #09653f;
  font-size: 12px;
  font-weight: 750;
}

.notice {
  padding: 18px;
  border-left: 4px solid var(--accent);
  background: #f1fbf6;
  color: #294039;
  border-radius: 0 8px 8px 0;
}

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

details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

summary {
  cursor: pointer;
  font-weight: 800;
  color: var(--ink);
}

details p {
  color: var(--muted);
}

.site-footer {
  padding: 42px 0;
  background: #0b0d0f;
  color: #dce4e2;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  gap: 28px;
}

.site-footer h3 {
  margin: 0 0 10px;
  color: #fff;
}

.site-footer a,
.site-footer p {
  color: #aebbb6;
}

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

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

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

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(3, 7, 9, 0.72);
}

.modal-dialog {
  position: relative;
  width: min(720px, 100%);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.34);
  padding: 28px;
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 22px;
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 22px 0;
}

.qr-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}

.qr-card img {
  width: 168px;
  height: 168px;
  margin: 0 auto 12px;
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    padding: 12px 20px 18px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links.is-open {
    display: flex;
  }

  .hero-grid,
  .split,
  .quote-grid,
  .download-panel,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .grid-3,
  .grid-2,
  .hero-proof,
  .metric-strip {
    grid-template-columns: 1fr;
  }

  .feature-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .modal {
    align-items: flex-start;
    overflow-y: auto;
  }

  .container {
    width: min(100% - 28px, var(--max));
  }

  .hero,
  .section,
  .page-hero,
  .content {
    padding-top: 46px;
    padding-bottom: 46px;
  }

  .hero-actions,
  .modal-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

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