:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --green: #16a34a;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #111827;
  --muted: #64748b;
  --line: #e2e8f0;
  --soft-blue: #eff6ff;
  --soft-green: #ecfdf5;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 250, 252, 0.88);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(1080px, calc(100% - 32px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--blue);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.24);
}

.brand-mark svg {
  width: 18px;
  height: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #475569;
  font-size: 14px;
}

.nav-links a {
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--blue);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
  border-radius: 99px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 700;
  font-size: 14px;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

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

.btn-primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.24);
}

.btn-primary:hover {
  background: var(--blue-dark);
}

.btn-secondary {
  background: #fff;
  color: var(--blue);
  border-color: #bfdbfe;
}

.btn-green {
  background: var(--green);
  color: #fff;
  box-shadow: 0 12px 30px rgba(22, 163, 74, 0.2);
}

.container {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 62px 0 52px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.96fr) minmax(360px, 1.04fr);
  align-items: center;
  gap: 46px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  padding: 6px 10px;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  background: var(--soft-blue);
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(36px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-subtitle {
  margin: 18px 0 0;
  max-width: 620px;
  color: #334155;
  font-size: 19px;
  line-height: 1.75;
}

.hero-note {
  margin: 16px 0 0;
  max-width: 620px;
  color: var(--muted);
  font-size: 15px;
}

.hero-actions,
.section-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.trust-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 28px;
  max-width: 560px;
}

.trust-item {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  color: #475569;
  font-size: 13px;
}

.preview-wrap {
  position: relative;
}

.preview-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
}

.preview-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.preview-caption {
  padding: 10px 14px 12px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

.floating-check {
  position: absolute;
  right: 18px;
  bottom: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff;
  color: #166534;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.14);
}

.section {
  padding: 42px 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-head p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.grid-3,
.grid-2,
.steps-grid {
  display: grid;
  gap: 14px;
}

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

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

.card,
.price-card,
.notice-card,
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.04);
}

.card {
  padding: 20px;
}

.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
  color: var(--blue);
  background: var(--soft-blue);
}

.card-icon.green {
  color: var(--green);
  background: var(--soft-green);
}

.card h3,
.price-card h3,
.notice-card h3,
.faq-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.35;
}

.card p,
.price-card p,
.notice-card p,
.faq-item p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.step-num {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--blue);
  font-weight: 800;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.notice-card {
  padding: 24px;
}

.notice-card strong {
  color: #0f172a;
}

.price-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.72fr);
  gap: 14px;
  align-items: stretch;
}

.price-card {
  padding: 24px;
}

.price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 12px 0;
}

.price strong {
  font-size: 34px;
  line-height: 1;
}

.price span {
  color: var(--muted);
}

.check-list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 24px;
  color: #475569;
  font-size: 15px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--green);
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  padding: 18px 20px;
}

.page-hero {
  padding: 58px 0 28px;
}

.page-hero p {
  max-width: 720px;
  margin: 14px 0 0;
  color: #475569;
  font-size: 18px;
}

.content-panel {
  width: min(1080px, calc(100% - 32px));
  margin: 32px auto 56px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow);
}

.content-panel h2 {
  margin: 28px 0 10px;
  font-size: 23px;
}

.content-panel h2:first-child {
  margin-top: 0;
}

.content-panel p,
.content-panel li {
  color: #475569;
}

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

.download-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.54fr);
  gap: 18px;
  align-items: center;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.version-badge {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--soft-green);
  color: var(--green);
  font-weight: 800;
  font-size: 13px;
}

.form-card {
  max-width: 680px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  color: #334155;
  font-size: 14px;
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 11px 12px;
  color: var(--text);
  background: #fff;
  font: inherit;
}

textarea {
  min-height: 108px;
  resize: vertical;
}

.form-full {
  grid-column: 1 / -1;
}

.form-card .btn {
  margin-top: 16px;
}

.form-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.turnstile-wrap {
  min-height: 0;
  margin: 4px 0 16px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  background: #fff;
}

.footer-inner {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

@media (max-width: 820px) {
  .nav {
    min-height: 62px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    left: 16px;
    right: 16px;
    top: 70px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fff;
    box-shadow: var(--shadow);
  }

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

  .nav-links a {
    padding: 12px;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-grid,
  .price-wrap,
  .download-box {
    grid-template-columns: 1fr;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 38px;
  }

  .hero-subtitle,
  .page-hero p {
    font-size: 17px;
  }

  .trust-row,
  .grid-3,
  .grid-2,
  .steps-grid,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .floating-check {
    position: static;
    width: calc(100% - 24px);
    margin: -18px auto 0;
  }

  .section {
    padding: 34px 0;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 460px) {
  .container,
  .nav,
  .footer-inner {
    width: min(100% - 24px, 1080px);
  }

  .hero h1,
  .page-hero h1 {
    font-size: 34px;
  }

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

  .btn {
    width: 100%;
  }

  .content-panel,
  .download-box,
  .form-card {
    padding: 20px;
  }
}