:root {
  color-scheme: light;
  --ios-bg: #f5f7fb;
  --ios-bg-2: #ebeff7;
  --ios-surface: rgba(255, 255, 255, 0.78);
  --ios-surface-strong: #ffffff;
  --ios-border: rgba(19, 37, 72, 0.12);
  --ios-text: #11203b;
  --ios-muted: #5f6d87;
  --ios-accent: #8fb3ff;
  --ios-accent-2: #dfe9ff;
  --ios-accent-3: #7cc8ff;
  --ios-shadow: 0 24px 80px rgba(53, 78, 122, 0.16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body.ios-page {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(143, 179, 255, 0.28), transparent 30%),
    radial-gradient(circle at 85% 12%, rgba(124, 200, 255, 0.22), transparent 24%),
    linear-gradient(180deg, var(--ios-bg), var(--ios-bg-2));
  color: var(--ios-text);
  min-height: 100vh;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.ios-skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--ios-surface-strong);
  box-shadow: var(--ios-shadow);
  transition: top 0.2s ease;
  z-index: 20;
}

.ios-skip:focus {
  top: 1rem;
}

.ios-header {
  position: sticky;
  top: 0;
  z-index: 15;
  backdrop-filter: blur(18px);
  background: rgba(245, 247, 251, 0.78);
  border-bottom: 1px solid rgba(17, 32, 59, 0.08);
}

.ios-brand {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 4.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.ios-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
}

.ios-mark {
  width: 2.8rem;
  aspect-ratio: 1;
  border-radius: 1rem;
  position: relative;
  background: linear-gradient(145deg, #ffffff, #dce6fb);
  box-shadow: inset 0 0 0 1px rgba(17, 32, 59, 0.08), 0 12px 28px rgba(114, 143, 196, 0.24);
}

.ios-mark span {
  position: absolute;
  inset: 0;
}

.ios-mark span:nth-child(1) {
  width: 1.18rem;
  height: 1.18rem;
  border-radius: 50% 50% 50% 14%;
  background: linear-gradient(145deg, var(--ios-accent), #5b87f4);
  top: 0.68rem;
  left: 0.62rem;
  transform: rotate(12deg);
}

.ios-mark span:nth-child(2) {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: #fff;
  top: 1.05rem;
  left: 1.02rem;
}

.ios-mark span:nth-child(3) {
  width: 0.9rem;
  height: 0.9rem;
  border: 2px solid rgba(91, 135, 244, 0.4);
  border-right-color: transparent;
  border-top-color: transparent;
  border-radius: 50%;
  top: 0.7rem;
  right: 0.45rem;
  transform: rotate(-20deg);
}

.ios-brand-link strong {
  display: block;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.ios-brand-link small {
  display: block;
  color: var(--ios-muted);
}

.ios-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.ios-nav a {
  color: var(--ios-muted);
  font-size: 0.95rem;
}

.ios-menu {
  display: none;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--ios-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  align-items: center;
  justify-content: center;
  gap: 0.22rem;
  flex-direction: column;
}

.ios-menu span {
  width: 1rem;
  height: 1.5px;
  background: var(--ios-text);
  border-radius: 999px;
}

.ios-hero,
.ios-strip,
.ios-panel-grid,
.ios-path,
.ios-device-map,
.ios-troubleshoot,
.ios-faq,
.ios-footer {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
}

.ios-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr);
  gap: 2rem;
  padding: 4.2rem 0 2.2rem;
  align-items: center;
}

.ios-eyebrow,
.ios-section-kicker {
  margin: 0 0 0.85rem;
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  color: var(--ios-muted);
}

.ios-hero h1 {
  margin: 0;
  font-size: clamp(2.8rem, 6vw, 5.3rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
  word-break: keep-all;
}

.ios-hero h1 span {
  display: block;
}

.ios-lead {
  margin: 1.35rem 0 0;
  max-width: 38rem;
  color: var(--ios-muted);
  font-size: 1.05rem;
  line-height: 1.85;
}

.ios-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.6rem;
}

.ios-cta {
  min-height: 3.3rem;
  padding: 0.8rem 1.25rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border: 1px solid transparent;
  font-weight: 700;
}

.ios-cta-primary {
  background: linear-gradient(135deg, var(--ios-text), #233b63);
  color: #fff;
  box-shadow: 0 18px 32px rgba(24, 42, 75, 0.18);
}

.ios-cta-secondary {
  background: rgba(255, 255, 255, 0.82);
  border-color: var(--ios-border);
}

.ios-device-note {
  margin-top: 1.1rem;
  color: var(--ios-muted);
  font-size: 0.94rem;
}

.ios-stage {
  position: relative;
  min-height: 560px;
  border-radius: 2rem;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.9), transparent 28%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(233, 240, 252, 0.84));
  box-shadow: var(--ios-shadow);
  overflow: hidden;
  border: 1px solid rgba(18, 36, 69, 0.08);
}

.ios-stage-orbit {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(91, 135, 244, 0.2);
}

.ios-stage-orbit-a {
  inset: 10% 18% auto auto;
  width: 18rem;
  height: 18rem;
}

.ios-stage-orbit-b {
  inset: auto auto 12% 8%;
  width: 14rem;
  height: 14rem;
}

.ios-tablet {
  position: absolute;
  border-radius: 2.2rem;
  background: linear-gradient(160deg, #ffffff, #dfe7f8);
  box-shadow: 0 28px 55px rgba(58, 82, 123, 0.18);
  border: 1px solid rgba(18, 36, 69, 0.08);
}

.ios-tablet::before {
  content: "";
  position: absolute;
  inset: 0.55rem;
  border-radius: 1.6rem;
  border: 1px solid rgba(18, 36, 69, 0.08);
  pointer-events: none;
}

.ios-tablet-back {
  width: min(48%, 330px);
  height: 390px;
  right: 2rem;
  top: 2rem;
  transform: rotate(10deg);
}

.ios-tablet-front {
  width: min(50%, 360px);
  height: 440px;
  left: 3rem;
  bottom: 1.8rem;
}

.ios-screen {
  height: calc(100% - 1.4rem);
  margin: 0.7rem;
  border-radius: 1.55rem;
  padding: 1.2rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.75rem;
}

.ios-screen-soft {
  background: linear-gradient(180deg, rgba(245, 248, 255, 0.98), rgba(224, 233, 250, 0.92));
}

.ios-screen-bright {
  background: linear-gradient(180deg, #ffffff, #eff4ff);
}

.ios-pill {
  display: inline-flex;
  width: fit-content;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(126, 160, 237, 0.14);
  color: #3560b7;
  font-size: 0.82rem;
}

.ios-pill-accent {
  background: rgba(124, 200, 255, 0.18);
  color: #2875b5;
}

.ios-screen strong {
  font-size: 1.4rem;
}

.ios-screen p {
  margin: 0;
  color: var(--ios-muted);
  line-height: 1.7;
}

.ios-mini-bar {
  margin-top: auto;
  height: 0.7rem;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--ios-accent), var(--ios-accent-3));
}

.ios-stage-badge {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 8.6rem;
  height: 8.6rem;
  border-radius: 50%;
  background: linear-gradient(180deg, #1f3356, #0f1830);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 2rem;
  letter-spacing: 0.12em;
  box-shadow: 0 24px 42px rgba(16, 24, 46, 0.24);
}

.ios-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding: 0.6rem 0 1.4rem;
}

.ios-entry {
  padding: 1.2rem;
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(18, 36, 69, 0.08);
  box-shadow: 0 16px 30px rgba(54, 78, 120, 0.08);
}

.ios-entry-active {
  background: linear-gradient(180deg, #ffffff, #eef4ff);
}

.ios-entry-tag {
  display: inline-flex;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  background: rgba(126, 160, 237, 0.14);
  color: #3155a8;
  font-size: 0.82rem;
}

.ios-entry h2 {
  margin: 0.9rem 0 0.55rem;
  font-size: 1.1rem;
}

.ios-entry p {
  margin: 0;
  color: var(--ios-muted);
  line-height: 1.8;
}

.ios-entry a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.95rem;
  font-weight: 700;
  color: #244a95;
}

.ios-panel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(300px, 0.88fr);
  gap: 1rem;
  padding: 1rem 0 1.4rem;
}

.ios-panel {
  background: var(--ios-surface);
  border: 1px solid var(--ios-border);
  box-shadow: 0 18px 38px rgba(53, 78, 122, 0.08);
  border-radius: 1.6rem;
  backdrop-filter: blur(16px);
}

.ios-panel-large {
  padding: 1.5rem;
}

.ios-panel-large h2,
.ios-path-head h2,
.ios-map-head h2,
.ios-trouble-card h2,
.ios-section-head h2 {
  margin: 0;
  font-size: clamp(1.6rem, 2.2vw, 2.45rem);
}

.ios-panel-large p {
  color: var(--ios-muted);
  line-height: 1.85;
}

.ios-checklist {
  margin: 1rem 0 0;
  padding-left: 1.15rem;
  color: var(--ios-text);
  line-height: 1.9;
}

.ios-panel-card {
  padding: 1.35rem;
}

.ios-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.ios-panel-head span {
  color: var(--ios-muted);
}

.ios-panel-head strong {
  font-size: 1.05rem;
}

.ios-meter {
  margin: 1rem 0;
  height: 0.85rem;
  border-radius: 999px;
  background: rgba(143, 179, 255, 0.18);
  overflow: hidden;
}

.ios-meter span {
  display: block;
  width: 60%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--ios-accent), var(--ios-accent-3));
}

.ios-data {
  margin: 0;
}

.ios-data > div {
  padding: 1rem 0;
  border-bottom: 1px solid rgba(18, 36, 69, 0.08);
}

.ios-data > div:last-child {
  border-bottom: 0;
}

.ios-data dt {
  color: var(--ios-muted);
  font-size: 0.9rem;
}

.ios-data dd {
  margin: 0.35rem 0 0;
  font-weight: 700;
}

.ios-path {
  padding: 1.2rem 0 1.4rem;
}

.ios-path-head p,
.ios-map-head p,
.ios-section-head p {
  margin-bottom: 0.5rem;
}

.ios-path-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}

.ios-path-steps article {
  padding: 1.2rem;
  border-radius: 1.3rem;
  background: var(--ios-surface-strong);
  border: 1px solid var(--ios-border);
  box-shadow: 0 14px 24px rgba(55, 78, 118, 0.06);
}

.ios-path-steps span {
  color: #5d83d3;
  letter-spacing: 0.16em;
  font-size: 0.8rem;
}

.ios-path-steps h3 {
  margin: 0.7rem 0 0.45rem;
  font-size: 1.1rem;
}

.ios-path-steps p {
  margin: 0;
  color: var(--ios-muted);
  line-height: 1.8;
}

.ios-device-map {
  padding: 1rem 0 1.4rem;
}

.ios-map {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}

.ios-map-chip {
  border: 1px solid var(--ios-border);
  background: rgba(255, 255, 255, 0.78);
  border-radius: 999px;
  padding: 0.8rem 1rem;
  font-weight: 700;
  color: var(--ios-muted);
}

.ios-map-chip.is-active {
  background: linear-gradient(135deg, #1f3356, #33538a);
  color: #fff;
}

.ios-troubleshoot {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.92fr);
  gap: 1rem;
  padding: 1rem 0 1.5rem;
}

.ios-trouble-card {
  padding: 1.4rem;
  border-radius: 1.4rem;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--ios-border);
  box-shadow: 0 18px 30px rgba(54, 78, 120, 0.08);
}

.ios-trouble-card ol {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  line-height: 1.9;
  color: var(--ios-muted);
}

.ios-trouble-accent {
  background: linear-gradient(180deg, #ffffff, #edf3ff);
}

.ios-trouble-accent a {
  display: inline-flex;
  margin-top: 1rem;
  font-weight: 700;
  color: #244a95;
}

.ios-faq {
  padding: 1rem 0 2rem;
}

.ios-section-head {
  margin-bottom: 1rem;
}

.ios-accordion {
  display: grid;
  gap: 0.85rem;
}

.ios-faq-item {
  border-radius: 1.2rem;
  overflow: hidden;
  border: 1px solid var(--ios-border);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 12px 24px rgba(54, 78, 120, 0.06);
}

.ios-faq-item button {
  width: 100%;
  border: 0;
  background: transparent;
  padding: 1.05rem 1.1rem;
  font: inherit;
  color: var(--ios-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-align: left;
}

.ios-faq-item button::after {
  content: "+";
  font-size: 1.2rem;
  color: #5073bf;
}

.ios-faq-item button[aria-expanded="true"]::after {
  content: "–";
}

.ios-faq-item div {
  padding: 0 1.1rem 1.1rem;
  color: var(--ios-muted);
  line-height: 1.85;
}

.ios-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0 2.5rem;
  color: var(--ios-muted);
}

.ios-footer strong {
  color: var(--ios-text);
}

.ios-footer p {
  margin: 0.3rem 0 0;
}

@media (max-width: 1100px) {
  .ios-hero,
  .ios-panel-grid,
  .ios-troubleshoot {
    grid-template-columns: 1fr;
  }

  .ios-stage {
    min-height: 520px;
  }
}

@media (max-width: 860px) {
  .ios-nav {
    display: none;
  }

  .ios-menu {
    display: inline-flex;
  }

  .ios-nav.is-open {
    display: flex;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 4.6rem;
    flex-direction: column;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--ios-border);
    border-radius: 1rem;
    box-shadow: var(--ios-shadow);
  }

  .ios-strip,
  .ios-path-steps {
    grid-template-columns: 1fr;
  }

  .ios-hero {
    padding-top: 2.4rem;
  }

  .ios-stage {
    min-height: 460px;
  }

  .ios-tablet-back {
    width: 70%;
    right: 1rem;
  }

  .ios-tablet-front {
    width: 78%;
    left: 1rem;
  }
}

@media (max-width: 560px) {
  .ios-brand {
    width: min(100%, calc(100% - 1rem));
  }

  .ios-hero,
  .ios-strip,
  .ios-panel-grid,
  .ios-path,
  .ios-device-map,
  .ios-troubleshoot,
  .ios-faq,
  .ios-footer {
    width: calc(100% - 1rem);
  }

  .ios-hero h1 {
    font-size: clamp(2.15rem, 13vw, 3.7rem);
    line-height: 0.97;
  }

  .ios-stage {
    min-height: 420px;
  }

  .ios-stage-badge {
    width: 7rem;
    height: 7rem;
    font-size: 1.6rem;
  }

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