/* /install — iOS 描述文件安装指引 */

.install-page {
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(0, 148, 91, .12), transparent 60%),
    radial-gradient(700px 360px at 90% 0%, rgba(30, 57, 50, .10), transparent 55%),
    var(--wash-soft-2);
  min-height: 100vh;
}

.install-nav {
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
  position: sticky;
  top: 0;
  z-index: 20;
}

.install-nav .brand-mark img {
  border-radius: 8px;
}

.install-main {
  padding-bottom: 64px;
}

.install-hero {
  padding: 48px 0 32px;
  text-align: center;
}

.install-hero-inner {
  max-width: 640px;
}

.install-app-icon {
  margin: 0 auto 18px;
  border-radius: 22px;
  box-shadow: var(--shadow-md);
}

.install-hero h1 {
  font-size: clamp(28px, 5vw, 36px);
  letter-spacing: -.02em;
  color: var(--brand-house);
  margin-bottom: 12px;
}

.install-lead {
  color: var(--body);
  font-size: 16px;
  line-height: 1.65;
  margin-bottom: 22px;
}

.install-lead a {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.install-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 14px;
}

.install-hint {
  font-size: 13px;
  color: var(--muted);
  max-width: 480px;
  margin: 0 auto;
}

.install-hint-ok {
  color: var(--brand);
}

.install-steps,
.install-faq {
  padding: 28px 0;
}

.install-steps h2,
.install-faq h2 {
  font-size: 22px;
  color: var(--brand-house);
  margin-bottom: 8px;
  text-align: center;
}

.install-steps-sub {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.step-list {
  display: grid;
  gap: 16px;
  max-width: 820px;
  margin: 0 auto;
}

.step-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  align-items: center;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
}

.step-illus {
  display: flex;
  justify-content: center;
}

.step-body {
  position: relative;
  padding-left: 8px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
  color: var(--ink);
}

.step-body p {
  font-size: 14px;
  color: var(--body);
  line-height: 1.6;
}

.install-faq {
  max-width: 720px;
  margin: 0 auto;
}

.install-faq .faq-item {
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  padding: 4px 16px;
}

.install-faq .faq-item p {
  color: var(--body);
  font-size: 14px;
  padding-bottom: 12px;
}

.install-faq a {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.install-faq code {
  font-size: 12px;
  background: var(--wash-soft);
  padding: 1px 6px;
  border-radius: 4px;
}

.install-footer {
  background: transparent;
  border-top: 1px solid var(--hairline);
}

.install-footer a {
  color: var(--brand);
}

@media (max-width: 640px) {
  .step-card {
    grid-template-columns: 1fr;
    text-align: left;
    padding: 14px;
  }
  .step-illus svg {
    width: 160px;
    height: auto;
  }
  .install-cta-row .btn {
    width: 100%;
  }
  .install-hero {
    padding-top: 32px;
  }
}