:root {
  --navy: #17233d;
  --navy-2: #223256;
  --blue: #4b61e8;
  --blue-soft: #e5e9ff;
  --coral: #e96355;
  --cream: #f5f0e7;
  --cream-2: #ebe4d8;
  --paper: #fffdf8;
  --ink: #162039;
  --muted: #697083;
  --line: #dcd8d0;
  --white: #ffffff;
  --shell: 1180px;
  --shadow: 0 28px 80px rgba(23, 35, 61, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 18px;
  z-index: 1000;
  padding: 10px 16px;
  color: var(--white);
  background: var(--navy);
  border: 1px solid var(--white);
  font-weight: 800;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 18px;
}

.header-shell,
.section-shell,
.footer-shell,
.index-shell {
  width: min(calc(100% - 40px), var(--shell));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 253, 248, 0.94);
  border-bottom: 1px solid rgba(23, 35, 61, 0.1);
  backdrop-filter: blur(18px);
}

.header-shell {
  min-height: 78px;
  display: grid;
  grid-template-columns: 220px 1fr 165px;
  align-items: center;
  gap: 28px;
}

.brand {
  width: max-content;
}

.brand img,
.footer-brand img {
  width: auto;
  height: 37px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 31px;
  color: #596174;
  font-size: 14px;
  font-weight: 760;
}

.site-nav a {
  position: relative;
  padding: 26px 0 23px;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 18px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--coral);
  transform: translateX(-50%) scale(0);
  transition: transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--navy);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: translateX(-50%) scale(1);
}

.header-action {
  justify-self: end;
  min-width: 150px;
  padding: 11px 17px;
  color: var(--white);
  background: var(--navy);
  border: 1px solid var(--navy);
  text-align: center;
  font-size: 14px;
  font-weight: 850;
  transition: color 0.2s ease, background 0.2s ease;
}

.header-action:hover,
.header-action:focus-visible {
  color: var(--navy);
  background: transparent;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(23, 35, 61, 0.2);
  background: transparent;
  cursor: pointer;
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding: 104px 0 88px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.8), rgba(245,240,231,0.95)),
    var(--cream);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  pointer-events: none;
}

.hero::before {
  width: 270px;
  height: 270px;
  left: -120px;
  top: 95px;
  border: 42px solid rgba(75, 97, 232, 0.09);
}

.hero::after {
  width: 145px;
  height: 145px;
  right: 8%;
  top: 70px;
  background: rgba(233, 99, 85, 0.1);
}

.hero-rings {
  position: absolute;
  left: 50%;
  top: 51%;
  width: 620px;
  height: 620px;
  border: 1px solid rgba(23, 35, 61, 0.055);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow:
    0 0 0 85px rgba(23, 35, 61, 0.018),
    0 0 0 170px rgba(23, 35, 61, 0.012);
}

.hero-shell {
  position: relative;
  z-index: 2;
  width: min(calc(100% - 40px), 930px);
  margin-inline: auto;
  text-align: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-kicker span {
  width: 30px;
  height: 1px;
  background: var(--blue);
}

.hero h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(52px, 8.5vw, 104px);
  line-height: 0.95;
  letter-spacing: -0.07em;
}

.hero-lead {
  max-width: 820px;
  margin: 29px auto 0;
  color: #60677a;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.92;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 23px;
  margin-top: 34px;
}

.primary-button {
  min-width: 330px;
  min-height: 74px;
  display: grid;
  grid-template-columns: 42px 1fr 24px;
  align-items: center;
  gap: 14px;
  padding: 11px 19px;
  color: var(--white);
  background: var(--navy);
  text-align: left;
  box-shadow: 8px 8px 0 var(--coral);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-button:hover,
.primary-button:focus-visible {
  transform: translate(4px, 4px);
  box-shadow: 4px 4px 0 var(--coral);
}

.apple-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  color: var(--coral);
  font-size: 14px;
}

.primary-button > span:nth-child(2) {
  display: grid;
}

.primary-button small {
  color: rgba(255,255,255,0.58);
  font-size: 10px;
  letter-spacing: 0.16em;
}

.primary-button strong {
  font-size: 16px;
}

.primary-button i {
  font-style: normal;
  font-size: 20px;
}

.text-button {
  padding: 10px 0 7px;
  border-bottom: 1px solid rgba(23,35,61,0.34);
  color: var(--navy);
  font-size: 14px;
  font-weight: 800;
}

.text-button span {
  margin-left: 7px;
  color: var(--coral);
}

.hero-answer {
  max-width: 820px;
  display: grid;
  grid-template-columns: 125px 1fr;
  align-items: center;
  gap: 20px;
  margin: 47px auto 0;
  padding: 17px 24px;
  border-top: 1px solid rgba(23,35,61,0.16);
  border-bottom: 1px solid rgba(23,35,61,0.16);
  text-align: left;
}

.hero-answer strong {
  color: var(--coral);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.hero-answer p {
  margin: 0;
  color: #596174;
  font-size: 14px;
}

.quick-index {
  background: var(--navy);
}

.index-shell {
  min-height: 110px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.quick-index a {
  display: flex;
  align-items: center;
  gap: 17px;
  padding: 25px 24px;
  color: rgba(255,255,255,0.7);
  border-right: 1px solid rgba(255,255,255,0.11);
  transition: color 0.2s ease, background 0.2s ease;
}

.quick-index a:first-child {
  border-left: 1px solid rgba(255,255,255,0.11);
}

.quick-index a:hover,
.quick-index a:focus-visible {
  color: var(--white);
  background: rgba(255,255,255,0.045);
}

.quick-index b {
  color: var(--coral);
  font-size: 13px;
}

.quick-index span {
  font-size: 14px;
  font-weight: 780;
}

.download-section,
.requirements-section,
.steps-section,
.troubleshooting-section,
.safety-section,
.faq-section,
.final-section {
  padding: 100px 0;
}

.download-section {
  background: var(--paper);
}

.download-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(460px, 1.14fr);
  align-items: center;
  gap: 80px;
}

.section-number {
  margin: 0 0 15px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
}

.section-title-block h2,
.center-heading h2,
.steps-intro h2,
.split-heading h2,
.safety-layout h2,
.faq-heading h2,
.final-shell h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(32px, 4.4vw, 54px);
  line-height: 1.13;
  letter-spacing: -0.045em;
}

.section-title-block > p:not(.section-number),
.center-heading > p:not(.section-number),
.steps-intro > p:not(.section-number),
.split-heading > p,
.faq-heading > p:not(.section-number) {
  color: var(--muted);
  font-size: 16px;
}

.section-title-block > p:not(.section-number) {
  margin: 23px 0 0;
}

.download-pass {
  min-height: 380px;
  display: grid;
  grid-template-columns: 92px 1fr;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.pass-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 28px 15px;
  color: var(--white);
  background: var(--blue);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.pass-side span {
  font-size: 15px;
  font-weight: 950;
  letter-spacing: 0.25em;
}

.pass-side small {
  color: rgba(255,255,255,0.62);
  font-size: 9px;
  letter-spacing: 0.15em;
}

.pass-main {
  padding: 38px 40px 31px;
}

.app-identity {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.app-identity img {
  width: 78px;
  height: 78px;
  object-fit: contain;
  border-radius: 18px;
}

.app-identity div {
  display: grid;
}

.app-identity small {
  color: var(--muted);
  font-size: 12px;
}

.app-identity strong {
  color: var(--navy);
  font-size: 25px;
  line-height: 1.3;
}

.app-identity span {
  margin-top: 4px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 760;
}

.pass-data {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.pass-data div {
  padding: 0 17px;
  border-right: 1px solid var(--line);
}

.pass-data div:first-child {
  padding-left: 0;
}

.pass-data div:last-child {
  padding-right: 0;
  border-right: 0;
}

.pass-data dt {
  color: var(--muted);
  font-size: 11px;
}

.pass-data dd {
  margin: 3px 0 0;
  color: var(--navy);
  font-size: 14px;
  font-weight: 850;
}

.pass-action {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 25px;
  padding: 10px 19px;
  color: var(--white);
  background: var(--navy);
  font-weight: 850;
  transition: background 0.2s ease;
}

.pass-action:hover,
.pass-action:focus-visible {
  background: var(--blue);
}

.pass-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 11px;
  text-align: center;
}

.requirements-section {
  background: var(--cream);
}

.center-heading {
  max-width: 820px;
  margin: 0 auto 50px;
  text-align: center;
}

.center-heading > p:not(.section-number) {
  max-width: 720px;
  margin: 20px auto 0;
}

.requirements-line {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(23,35,61,0.18);
  border-bottom: 1px solid rgba(23,35,61,0.18);
}

.requirements-line article {
  min-height: 245px;
  padding: 32px 28px;
  border-right: 1px solid rgba(23,35,61,0.18);
}

.requirements-line article:last-child {
  border-right: 0;
}

.requirements-line span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.requirements-line strong {
  display: block;
  margin-top: 16px;
  color: var(--navy);
  font-size: clamp(26px, 3vw, 38px);
  letter-spacing: -0.04em;
}

.requirements-line p {
  margin: 22px 0 0;
  color: #676d7d;
  font-size: 14px;
}

.requirements-note {
  max-width: 900px;
  display: grid;
  grid-template-columns: 230px 1fr;
  align-items: center;
  gap: 28px;
  margin: 38px auto 0;
  padding: 20px 26px;
  color: var(--white);
  background: var(--navy);
}

.requirements-note b {
  color: #ffb0a5;
  font-size: 14px;
}

.requirements-note p {
  margin: 0;
  color: rgba(255,255,255,0.72);
  font-size: 14px;
}

.steps-section {
  background: var(--paper);
}

.steps-shell {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  align-items: start;
  gap: 92px;
}

.steps-intro {
  position: sticky;
  top: 118px;
}

.steps-intro > p:not(.section-number) {
  margin: 23px 0 0;
}

.inline-download {
  display: inline-flex;
  align-items: center;
  gap: 20px;
  margin-top: 25px;
  padding-bottom: 7px;
  border-bottom: 2px solid var(--coral);
  color: var(--navy);
  font-weight: 850;
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.step-list li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 25px;
  padding: 35px 0;
  border-bottom: 1px solid var(--line);
}

.step-count {
  color: var(--coral);
  font-size: 14px;
  font-weight: 950;
  letter-spacing: 0.12em;
}

.step-list h3 {
  margin: 0;
  color: var(--navy);
  font-size: 22px;
}

.step-list p {
  margin: 10px 0 0;
  color: var(--muted);
}

.troubleshooting-section {
  color: var(--white);
  background: var(--navy);
}

.split-heading {
  display: grid;
  grid-template-columns: 1fr 380px;
  align-items: end;
  gap: 70px;
  margin-bottom: 46px;
}

.split-heading .section-number {
  color: #93a1ff;
}

.split-heading h2 {
  color: var(--white);
}

.split-heading > p {
  margin: 0;
  color: rgba(255,255,255,0.63);
}

.problem-table {
  border-top: 1px solid rgba(255,255,255,0.17);
}

.problem-row {
  display: grid;
  grid-template-columns: 0.8fr 0.85fr 1.35fr;
  align-items: center;
  gap: 30px;
  min-height: 104px;
  padding: 22px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.13);
}

.problem-row:nth-child(even):not(.problem-head) {
  background: rgba(255,255,255,0.035);
}

.problem-head {
  min-height: 58px;
  color: #ffada2;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.problem-row strong {
  color: var(--white);
  font-size: 15px;
}

.problem-row span {
  color: #aeb7d3;
  font-size: 14px;
}

.problem-row p {
  margin: 0;
  color: rgba(255,255,255,0.68);
  font-size: 14px;
}

.safety-section {
  background: var(--blue-soft);
}

.safety-layout {
  display: grid;
  grid-template-columns: 170px 1fr 190px;
  align-items: center;
  gap: 58px;
}

.safety-seal {
  width: 150px;
  height: 150px;
  display: grid;
  place-items: center;
  align-content: center;
  border: 1px solid rgba(23,35,61,0.2);
  border-radius: 50%;
  box-shadow: inset 0 0 0 12px rgba(255,255,255,0.5);
}

.safety-seal span {
  color: var(--coral);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.2em;
}

.safety-seal strong {
  color: var(--navy);
  font-size: 37px;
  line-height: 1;
}

.safety-layout ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 28px;
  margin: 27px 0 0;
  padding: 0;
  list-style: none;
}

.safety-layout li {
  position: relative;
  padding-left: 18px;
  color: #596174;
  font-size: 14px;
}

.safety-layout li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 7px;
  height: 7px;
  background: var(--coral);
}

.outline-action {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  border: 1px solid var(--navy);
  color: var(--navy);
  font-size: 14px;
  font-weight: 850;
  transition: color 0.2s ease, background 0.2s ease;
}

.outline-action:hover,
.outline-action:focus-visible {
  color: var(--white);
  background: var(--navy);
}

.faq-section {
  background: var(--paper);
}

.faq-layout {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: 90px;
  align-items: start;
}

.faq-heading {
  padding-top: 13px;
}

.faq-heading > p:not(.section-number) {
  margin: 22px 0 0;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 17px 0;
  color: var(--navy);
  font-size: 17px;
  font-weight: 850;
  cursor: pointer;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--coral);
  font-size: 20px;
  font-weight: 400;
  transition: transform 0.2s ease;
}

.faq-list details[open] summary span {
  transform: rotate(45deg);
}

.faq-list details p {
  margin: -4px 52px 24px 0;
  color: var(--muted);
}

.final-section {
  padding: 54px 0;
  background: var(--cream);
  border-top: 1px solid var(--line);
}

.final-shell {
  display: grid;
  grid-template-columns: 78px 1fr 220px;
  align-items: center;
  gap: 27px;
}

.final-shell img {
  width: 70px;
  height: 70px;
  object-fit: contain;
  border-radius: 16px;
}

.final-shell p {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.final-shell h2 {
  font-size: clamp(24px, 3.2vw, 38px);
}

.final-button {
  min-height: 57px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  color: var(--white);
  background: var(--coral);
  font-size: 14px;
  font-weight: 850;
  transition: background 0.2s ease;
}

.final-button:hover,
.final-button:focus-visible {
  background: var(--navy);
}

.site-footer {
  color: rgba(255,255,255,0.68);
  background: #10182a;
}

.footer-shell {
  display: grid;
  grid-template-columns: 1fr 0.75fr 1.25fr;
  gap: 55px;
  padding: 55px 0 43px;
}

.footer-brand img {
  filter: brightness(0) invert(1);
}

.footer-brand p,
.footer-note {
  margin: 17px 0 0;
  font-size: 13px;
}

.footer-links {
  display: grid;
  align-content: start;
  gap: 9px;
  font-size: 13px;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--white);
}

.footer-note {
  margin: 0;
}

.copyright {
  padding: 17px 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 12px;
}

.mobile-download-bar {
  display: none;
}

@media (max-width: 980px) {
  .header-shell {
    grid-template-columns: 1fr auto auto;
  }

  .site-nav {
    position: absolute;
    top: 78px;
    left: 20px;
    right: 20px;
    display: none;
    padding: 10px;
    background: var(--paper);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    padding: 12px 13px;
  }

  .site-nav a::after {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .download-layout,
  .steps-shell,
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .steps-intro {
    position: static;
  }

  .requirements-line {
    grid-template-columns: repeat(2, 1fr);
  }

  .requirements-line article:nth-child(2) {
    border-right: 0;
  }

  .requirements-line article:nth-child(-n+2) {
    border-bottom: 1px solid rgba(23,35,61,0.18);
  }

  .split-heading {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .safety-layout {
    grid-template-columns: 140px 1fr;
    gap: 35px;
  }

  .outline-action {
    grid-column: 2;
    width: 200px;
  }

  .footer-shell {
    grid-template-columns: 1fr 1fr;
  }

  .footer-note {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 74px;
  }

  body {
    padding-bottom: 70px;
  }

  .header-shell,
  .section-shell,
  .footer-shell,
  .index-shell {
    width: min(calc(100% - 28px), var(--shell));
  }

  .site-header {
    position: sticky;
  }

  .header-shell {
    min-height: 68px;
    grid-template-columns: 1fr auto;
  }

  .brand img {
    height: 31px;
  }

  .header-action {
    display: none;
  }

  .site-nav {
    top: 68px;
    left: 14px;
    right: 14px;
  }

  .hero {
    padding: 72px 0 62px;
  }

  .hero h1 {
    font-size: clamp(48px, 15vw, 70px);
  }

  .hero-lead {
    font-size: 15px;
    line-height: 1.8;
  }

  .primary-button {
    width: 100%;
    min-width: 0;
  }

  .text-button {
    width: max-content;
  }

  .hero-answer {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-inline: 0;
  }

  .hero-rings {
    width: 380px;
    height: 380px;
  }

  .quick-index {
    overflow-x: auto;
  }

  .index-shell {
    width: max-content;
    min-width: 100%;
    grid-template-columns: repeat(4, 190px);
  }

  .quick-index a {
    min-height: 88px;
    padding: 18px;
  }

  .download-section,
  .requirements-section,
  .steps-section,
  .troubleshooting-section,
  .safety-section,
  .faq-section {
    padding: 74px 0;
  }

  .download-layout {
    gap: 39px;
  }

  .download-pass {
    min-height: 0;
    grid-template-columns: 56px 1fr;
  }

  .pass-side {
    padding: 22px 10px;
  }

  .pass-main {
    padding: 27px 20px 23px;
  }

  .app-identity {
    gap: 13px;
  }

  .app-identity img {
    width: 58px;
    height: 58px;
    border-radius: 13px;
  }

  .app-identity strong {
    font-size: 20px;
  }

  .pass-data {
    grid-template-columns: 1fr;
  }

  .pass-data div,
  .pass-data div:first-child,
  .pass-data div:last-child {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 9px 0;
    border-right: 0;
    border-bottom: 1px dashed var(--line);
  }

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

  .pass-data dd {
    text-align: right;
  }

  .requirements-line {
    grid-template-columns: 1fr;
  }

  .requirements-line article,
  .requirements-line article:nth-child(2) {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid rgba(23,35,61,0.18);
  }

  .requirements-line article:last-child {
    border-bottom: 0;
  }

  .requirements-note {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .step-list li {
    grid-template-columns: 48px 1fr;
    gap: 13px;
  }

  .problem-table {
    border-top: 0;
  }

  .problem-head {
    display: none;
  }

  .problem-row {
    grid-template-columns: 1fr;
    gap: 8px;
    min-height: 0;
    margin-bottom: 12px;
    padding: 22px;
    border: 1px solid rgba(255,255,255,0.14);
  }

  .safety-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .safety-seal {
    width: 120px;
    height: 120px;
  }

  .safety-layout ul {
    grid-template-columns: 1fr;
  }

  .outline-action {
    grid-column: auto;
    width: 100%;
  }

  .faq-list summary {
    font-size: 15px;
  }

  .faq-list details p {
    margin-right: 0;
  }

  .final-shell {
    grid-template-columns: 62px 1fr;
  }

  .final-shell img {
    width: 58px;
    height: 58px;
  }

  .final-button {
    grid-column: 1 / -1;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-note {
    grid-column: auto;
  }

  .mobile-download-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 120;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding: 10px 14px;
    color: var(--white);
    background: rgba(16,24,42,0.96);
    border-top: 1px solid rgba(255,255,255,0.15);
    backdrop-filter: blur(14px);
  }

  .mobile-download-bar div {
    display: grid;
  }

  .mobile-download-bar small {
    color: rgba(255,255,255,0.58);
    font-size: 10px;
  }

  .mobile-download-bar strong {
    font-size: 13px;
  }

  .mobile-download-bar a {
    flex: 0 0 auto;
    padding: 10px 15px;
    color: var(--white);
    background: var(--coral);
    font-size: 13px;
    font-weight: 850;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}