:root {
  color-scheme: light;
  --ink: #10251e;
  --muted: #60716a;
  --green-950: #032b20;
  --green-900: #073a2b;
  --green-800: #0b503a;
  --green-700: #146a4c;
  --green-600: #1a805b;
  --mint-100: #e7f4ed;
  --mint-50: #f3faf6;
  --ivory: #fbfcf8;
  --line: rgba(18, 78, 57, 0.15);
  --shadow: 0 24px 70px rgba(2, 39, 28, 0.14);
  --radius-lg: 30px;
  --radius-md: 22px;
  --content: min(1160px, calc(100% - 40px));
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--ivory);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  border-radius: 12px;
  background: white;
  color: var(--green-900);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 50%;
  width: var(--content);
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transform: translateX(-50%);
  color: white;
}
.solid-header {
  position: relative;
  width: 100%;
  left: 0;
  padding-inline: max(20px, calc((100% - 1160px) / 2));
  transform: none;
  background: var(--green-950);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
}
.brand img,
.footer-brand img {
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);
}
.brand span,
.footer-brand span { display: grid; line-height: 1.2; }
.brand strong { font-size: 1.15rem; letter-spacing: 0.02em; }
.brand small { margin-top: 4px; color: rgba(233, 249, 241, 0.68); }
nav { display: flex; align-items: center; gap: 30px; }
nav a {
  color: rgba(250, 255, 252, 0.78);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
}
nav a:hover,
nav a:focus-visible,
nav a[aria-current="page"] { color: white; }
.nav-contact {
  padding: 9px 17px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 999px;
}

.hero {
  position: relative;
  min-height: 780px;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 80px;
  align-items: center;
  padding: 150px max(20px, calc((100% - 1160px) / 2)) 80px;
  color: white;
  background:
    linear-gradient(90deg, rgba(2, 42, 31, 0.98) 0%, rgba(2, 48, 35, 0.91) 47%, rgba(3, 53, 39, 0.61) 100%),
    url("hero-bg.jpg") center 48% / cover no-repeat;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 180px;
  background: linear-gradient(transparent, rgba(2, 40, 29, 0.54));
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; max-width: 690px; }
.eyebrow {
  margin: 0 0 16px;
  color: #bfe9d3;
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.eyebrow.dark { color: var(--green-700); }
h1, h2, h3, p { margin-top: 0; }
.hero h1 {
  margin-bottom: 24px;
  font-size: clamp(3.4rem, 6vw, 5.8rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}
.hero-copy {
  max-width: 610px;
  margin-bottom: 32px;
  color: rgba(239, 250, 244, 0.8);
  font-size: 1.16rem;
  line-height: 1.75;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible,
summary:focus-visible,
a:focus-visible { outline: 3px solid #97e2bb; outline-offset: 4px; }
.button-primary {
  color: var(--green-950);
  background: #eaf8f0;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.18);
}
.button-secondary {
  border: 1px solid rgba(255, 255, 255, 0.32);
  color: white;
  background: rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(16px);
}
.version-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}
.version-list li {
  padding: 6px 11px;
  border: 1px solid rgba(215, 246, 229, 0.18);
  border-radius: 999px;
  color: rgba(229, 247, 238, 0.72);
  font-size: 0.82rem;
}
.device-wrap { position: relative; z-index: 2; align-self: end; height: 630px; }
.device-glow {
  position: absolute;
  width: 420px;
  height: 420px;
  right: -50px;
  top: 90px;
  border-radius: 50%;
  background: rgba(152, 233, 190, 0.2);
  filter: blur(70px);
}
.device-frame {
  position: absolute;
  top: 18px;
  right: 0;
  width: 340px;
  overflow: hidden;
  border: 8px solid #17201d;
  border-radius: 52px;
  background: #eef0f5;
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.42), inset 0 0 0 2px rgba(255, 255, 255, 0.65);
  transform: rotate(2deg);
}

.quick-help,
.faq-section {
  width: var(--content);
  margin-inline: auto;
  padding: 104px 0 20px;
}
.section-heading { max-width: 720px; margin-bottom: 38px; }
.section-heading.compact { margin-bottom: 28px; }
.section-heading h2,
.contact-section h2,
.policy-intro h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.18;
  letter-spacing: -0.045em;
}
.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.guide-card {
  min-height: 330px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: white;
  box-shadow: 0 18px 44px rgba(5, 63, 44, 0.08);
}
.guide-card h3 { margin: 36px 0 14px; font-size: 1.34rem; line-height: 1.35; }
.guide-card p { color: var(--muted); }
.card-number {
  display: inline-flex;
  width: 50px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  color: var(--green-700);
  background: var(--mint-100);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}
.path {
  margin: 24px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--green-700) !important;
  font-size: 0.86rem;
  font-weight: 700;
}
.accent-card {
  color: white;
  border-color: transparent;
  background: linear-gradient(145deg, var(--green-800), var(--green-950));
}
.accent-card p { color: rgba(236, 249, 242, 0.74); }
.accent-card .card-number { color: white; background: rgba(255, 255, 255, 0.13); }
.text-link { color: #bde8d1; font-weight: 700; text-underline-offset: 4px; }

.faq-section { padding-bottom: 110px; }
.faq-list {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: white;
  box-shadow: var(--shadow);
}
details { border-bottom: 1px solid var(--line); }
details:last-child { border-bottom: 0; }
summary {
  position: relative;
  padding: 22px 70px 22px 26px;
  cursor: pointer;
  font-size: 1.04rem;
  font-weight: 700;
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: "+";
  position: absolute;
  right: 26px;
  top: 19px;
  color: var(--green-700);
  font-size: 1.4rem;
  font-weight: 400;
  transition: transform 160ms ease;
}
details[open] summary::after { transform: rotate(45deg); }
details p { max-width: 850px; margin: -4px 70px 24px 26px; color: var(--muted); }

.contact-section {
  width: var(--content);
  margin: 0 auto 110px;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 70px;
  align-items: center;
  padding: 52px;
  border-radius: 36px;
  color: white;
  background:
    radial-gradient(circle at 80% 0%, rgba(156, 235, 194, 0.24), transparent 32%),
    linear-gradient(135deg, var(--green-800), var(--green-950));
  box-shadow: var(--shadow);
}
.contact-section h2 { margin-bottom: 17px; }
.contact-section p:not(.eyebrow) { margin-bottom: 0; color: rgba(236, 249, 242, 0.75); }
.contact-box {
  display: grid;
  gap: 7px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(20px);
}
.contact-box span { color: rgba(233, 249, 241, 0.65); font-size: 0.82rem; }
.contact-box strong { overflow-wrap: anywhere; }
.button-light { margin-top: 14px; color: var(--green-950); background: white; }

footer {
  width: var(--content);
  min-height: 120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border-top: 1px solid var(--line);
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand small { margin-top: 3px; color: var(--muted); }
.footer-links { display: flex; align-items: center; gap: 24px; color: var(--muted); font-size: 0.88rem; }
.footer-links a { text-underline-offset: 4px; }

.policy-page { background: #f5f8f5; }
.policy-main { width: min(900px, calc(100% - 40px)); margin: 0 auto; padding: 90px 0 110px; }
.policy-intro { margin-bottom: 32px; }
.back-link { display: inline-block; margin-bottom: 46px; color: var(--green-700); font-weight: 700; text-underline-offset: 4px; }
.policy-intro h1 { margin-bottom: 12px; }
.policy-date { color: var(--muted); }
.policy-callout {
  margin-top: 34px;
  padding: 26px 28px;
  border: 1px solid rgba(30, 128, 91, 0.18);
  border-radius: var(--radius-md);
  background: var(--mint-100);
}
.policy-callout strong { color: var(--green-800); font-size: 1.08rem; }
.policy-callout p { margin: 7px 0 0; color: #3e5b50; }
.policy-content {
  padding: 14px 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: white;
  box-shadow: var(--shadow);
}
.policy-content section { padding: 32px 0; border-bottom: 1px solid var(--line); }
.policy-content section:last-child { border-bottom: 0; }
.policy-content h2 { margin-bottom: 12px; font-size: 1.28rem; }
.policy-content p,
.policy-content li { color: var(--muted); }
.policy-content p:last-child { margin-bottom: 0; }
.policy-content ul { margin: 0; padding-left: 1.25rem; }
.policy-content li + li { margin-top: 10px; }
.policy-content a { color: var(--green-700); }

@media (max-width: 900px) {
  .site-header { min-height: 78px; }
  nav { gap: 17px; }
  nav a { display: none; }
  nav .nav-contact { display: inline-flex; }
  .hero { grid-template-columns: minmax(0, 1fr) 280px; gap: 35px; min-height: 720px; }
  .device-wrap { height: 560px; }
  .device-frame { width: 285px; }
  .guide-grid { grid-template-columns: 1fr 1fr; }
  .accent-card { grid-column: 1 / -1; min-height: 250px; }
  .contact-section { grid-template-columns: 1fr; gap: 30px; }
}

@media (max-width: 680px) {
  :root { --content: min(100% - 32px, 1160px); }
  .brand img { width: 43px; height: 43px; }
  .brand strong { font-size: 1rem; }
  .brand small { font-size: 0.72rem; }
  .nav-contact { padding: 7px 13px; font-size: 0.84rem; }
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: 132px;
    padding-bottom: 0;
  }
  .hero h1 { font-size: clamp(3rem, 15vw, 4.5rem); }
  .hero-copy { font-size: 1rem; }
  .device-wrap { width: 100%; height: 450px; margin-top: 5px; overflow: hidden; }
  .device-frame { width: 260px; left: 50%; right: auto; transform: translateX(-50%) rotate(1deg); }
  .quick-help,
  .faq-section { padding-top: 76px; }
  .guide-grid { grid-template-columns: 1fr; }
  .accent-card { grid-column: auto; }
  .guide-card { min-height: 0; }
  .section-heading h2,
  .contact-section h2,
  .policy-intro h1 { font-size: 2rem; }
  summary { padding: 19px 54px 19px 20px; }
  summary::after { right: 20px; top: 16px; }
  details p { margin: -2px 40px 21px 20px; }
  .faq-section { padding-bottom: 76px; }
  .contact-section { margin-bottom: 70px; padding: 30px 24px; border-radius: 28px; }
  footer { padding: 28px 0; align-items: flex-start; flex-direction: column; }
  .footer-links { flex-wrap: wrap; gap: 12px 18px; }
  .policy-main { padding: 58px 0 78px; }
  .back-link { margin-bottom: 36px; }
  .policy-content { padding: 4px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}