:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-soft: #eef6ff;
  --text: #0f172a;
  --muted: #475569;
  --line: #dbe4ee;
  --primary: #0ea5e9;
  --primary-strong: #0284c7;
  --primary-dark: #075985;
  --secondary: #0f766e;
  --warning: #f59e0b;
  --danger: #b91c1c;
  --shadow: 0 14px 32px rgba(15, 23, 42, 0.1);
  --radius: 8px;
  --tap: 48px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.58;
  text-rendering: optimizeLegibility;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--primary-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--primary-dark);
}

button,
a,
input,
select,
textarea {
  touch-action: manipulation;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  z-index: 20;
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
  background: var(--text);
  color: #fff;
  padding: 10px 14px;
  border-radius: var(--radius);
}

.skip-link:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.98);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner,
.container {
  width: min(100% - 24px, 1120px);
  margin: 0 auto;
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 10px 0;
}

.brand {
  min-height: var(--tap);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-logo {
  width: clamp(156px, 45vw, 210px);
  max-height: 52px;
  height: auto;
  object-fit: contain;
}

.menu-toggle {
  min-width: var(--tap);
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.menu-toggle:focus-visible {
  outline: 3px solid rgba(14, 165, 233, 0.3);
  outline-offset: 2px;
}

.menu-toggle-bars {
  position: relative;
  width: 20px;
  height: 2px;
  border-radius: 99px;
  background: currentColor;
  transition: background 0.18s ease;
}

.menu-toggle-bars::before,
.menu-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  border-radius: 99px;
  background: currentColor;
  transition: transform 0.18s ease, top 0.18s ease;
}

.menu-toggle-bars::before {
  top: -7px;
}

.menu-toggle-bars::after {
  top: 7px;
}

.site-header.nav-open .menu-toggle-bars {
  background: transparent;
}

.site-header.nav-open .menu-toggle-bars::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header.nav-open .menu-toggle-bars::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav {
  grid-column: 1 / -1;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  padding: 0;
  scrollbar-width: none;
  transition: max-height 0.22s ease, opacity 0.18s ease, transform 0.18s ease, padding 0.18s ease;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav a {
  min-width: var(--tap);
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: #334155;
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: normal;
}

.nav a:hover,
.nav a:focus-visible {
  background: var(--surface-soft);
  border-color: #bfdbfe;
  color: var(--text);
  outline: none;
}

.site-header.nav-open .nav {
  max-height: calc(100vh - 78px);
  overflow-y: auto;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  padding: 8px 0 10px;
}

main {
  min-height: 60vh;
}

.hero {
  padding: 28px 0 22px;
}

.hero-grid,
.two-col,
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  color: var(--secondary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--secondary);
}

h1,
h2,
h3 {
  color: var(--text);
  line-height: 1.2;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(1.9rem, 9vw, 2.65rem);
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.35rem, 6vw, 1.75rem);
}

h3 {
  margin: 0 0 8px;
  font-size: 1.04rem;
}

p {
  margin: 0 0 14px;
}

.lead {
  max-width: 72ch;
  color: var(--muted);
  font-size: 1.04rem;
  line-height: 1.56;
}

.hero-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 18px;
}

.button {
  min-width: var(--tap);
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--primary-strong);
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(14, 165, 233, 0.28);
}

.button:hover,
.button:focus-visible {
  background: var(--primary-strong);
  color: #fff;
  outline: none;
}

.button.secondary,
.button.support {
  background: var(--surface);
  color: var(--primary-dark);
  border-color: #bfdbfe;
  box-shadow: none;
}

.button.secondary:hover,
.button.secondary:focus-visible,
.button.support:hover,
.button.support:focus-visible {
  background: #eff6ff;
  color: var(--primary-dark);
}

.button.support {
  color: var(--secondary);
  border-color: #99f6e4;
}

.hero-media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 8px;
}

.hero-media img {
  width: 100%;
  border-radius: calc(var(--radius) - 2px);
}

.section {
  padding: 26px 0;
}

.section.alt {
  background: #eef6f8;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  max-width: 820px;
  margin-bottom: 16px;
}

.section-head p {
  color: var(--muted);
}

.grid,
.quick-grid,
.related-grid,
.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.card,
.quick-card,
.related-card,
.notice,
.toc,
.diagnostic-panel,
.faq-item,
.contact-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.card,
.quick-card,
.related-card,
.faq-item,
.contact-box {
  padding: 16px;
}

.quick-card,
.related-card {
  min-height: var(--tap);
  display: flex;
  flex-direction: column;
  gap: 9px;
  color: var(--text);
  text-decoration: none;
}

.quick-card:hover,
.quick-card:focus-visible,
.related-card:hover,
.related-card:focus-visible {
  border-color: rgba(14, 165, 233, 0.55);
  box-shadow: 0 12px 26px rgba(14, 165, 233, 0.1);
  color: var(--text);
  outline: none;
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  background: #e0f2fe;
  color: var(--primary-dark);
  font-weight: 800;
  line-height: 1;
}

.card-icon.teal {
  background: #ccfbf1;
  color: var(--secondary);
}

.card-icon.amber {
  background: #fef3c7;
  color: #92400e;
}

.quick-card strong,
.related-card strong {
  display: block;
  line-height: 1.32;
}

.quick-card span,
.related-card span,
.muted {
  color: var(--muted);
}

.steps {
  display: grid;
  gap: 12px;
  counter-reset: step;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  position: relative;
  min-height: var(--tap);
  padding: 16px 16px 16px 56px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 16px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-weight: 800;
}

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

.checklist li {
  position: relative;
  padding-left: 28px;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52em;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--secondary);
  box-shadow: inset 0 0 0 3px #ccfbf1;
}

.warning-list li::before {
  background: var(--warning);
  box-shadow: inset 0 0 0 3px #fef3c7;
}

.notice {
  padding: 15px;
  border-left: 4px solid var(--warning);
  background: #fffbeb;
}

.notice strong {
  color: #78350f;
}

.toc {
  padding: 15px;
  position: static;
}

.toc ul {
  margin: 10px 0 0;
  padding-left: 18px;
}

.toc a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.breadcrumbs {
  padding-top: 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs a {
  min-height: var(--tap);
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: #94a3b8;
}

.page-hero {
  padding: 22px 0 22px;
}

.page-hero .lead {
  max-width: 860px;
}

.last-updated {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  margin-top: 6px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--surface);
  font-size: 0.9rem;
}

.content {
  padding-bottom: 32px;
}

.content section {
  margin-bottom: 28px;
}

.content ul,
.content ol {
  padding-left: 20px;
}

.content li {
  margin-bottom: 8px;
}

.content a:not(.button):not(.quick-card):not(.related-card):not(.brand) {
  min-height: 32px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: #f1f5f9;
  color: var(--text);
  font-size: 0.9rem;
}

tr:last-child td {
  border-bottom: 0;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item h3 {
  font-size: 1rem;
}

.diagnostic-panel {
  padding: 16px;
  box-shadow: var(--shadow);
}

.status-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.status-row:last-child {
  border-bottom: 0;
}

.status-label {
  color: var(--muted);
  font-size: 0.9rem;
}

.status-bar {
  height: 10px;
  border-radius: 99px;
  background: #dbeafe;
  overflow: hidden;
}

.status-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.support-form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  font-weight: 700;
}

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

textarea {
  min-height: 150px;
  resize: vertical;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #0f172a;
  color: #cbd5e1;
  padding: 30px 0;
}

.footer-grid h2,
.footer-grid h3 {
  color: #fff;
}

.footer-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  min-height: var(--tap);
  display: flex;
  align-items: center;
  color: #dbeafe;
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #fff;
  text-decoration: underline;
  outline: none;
}

.footer-note {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid rgba(203, 213, 225, 0.22);
  color: #cbd5e1;
  font-size: 0.92rem;
}

.mobile-action-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  display: none;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 10px;
  padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid var(--line);
  box-shadow: 0 -12px 30px rgba(15, 23, 42, 0.14);
  backdrop-filter: blur(14px);
}

.mobile-action-btn {
  min-width: var(--tap);
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 10px;
  border-radius: var(--radius);
  font-size: 0.94rem;
  font-weight: 800;
  line-height: 1.15;
  text-align: center;
  text-decoration: none;
}

.mobile-action-primary {
  background: #0ea5e9;
  color: #fff;
  box-shadow: 0 10px 22px rgba(14, 165, 233, 0.32);
}

.mobile-action-primary:hover,
.mobile-action-primary:focus-visible {
  background: var(--primary-strong);
  color: #fff;
  outline: none;
}

.mobile-action-secondary {
  border: 1px solid #99f6e4;
  background: #ecfdf5;
  color: #0f766e;
}

.mobile-action-secondary:hover,
.mobile-action-secondary:focus-visible {
  background: #ccfbf1;
  color: #115e59;
  outline: none;
}

@media (max-width: 768px) {
  body.has-sticky-bar {
    padding-bottom: 86px;
  }

  body.has-sticky-bar .site-footer {
    padding-bottom: 112px;
  }

  body.has-sticky-bar .mobile-action-bar {
    display: grid;
  }

  .hero-grid,
  .two-col,
  .quick-grid,
  .problem-grid,
  .related-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    grid-template-columns: 1fr;
  }

  .hero-actions[style] {
    margin: 16px 0 !important;
  }

  .quick-card,
  .related-card,
  .contact-box,
  .faq-item,
  .card {
    width: 100%;
  }

  .toc {
    display: none;
  }

  table {
    min-width: 0;
    table-layout: fixed;
    font-size: 0.92rem;
  }

  th,
  td {
    padding: 10px 8px;
    overflow-wrap: anywhere;
    word-break: break-word;
  }

  .table-wrap {
    overflow-x: hidden;
  }
}

@media (min-width: 769px) {
  body {
    font-size: 16px;
    line-height: 1.65;
  }

  .header-inner {
    display: flex;
    min-height: 72px;
    flex-direction: row;
    align-items: center;
    gap: 20px;
    padding: 0;
  }

  .menu-toggle {
    display: none;
  }

  .brand {
    font-size: 1.05rem;
  }

  .brand-logo {
    width: 220px;
    max-height: 55px;
  }

  .nav {
    display: flex;
    grid-column: auto;
    width: auto;
    margin-left: auto;
    max-height: none;
    overflow-x: auto;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    padding: 14px 0;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
    transition: none;
  }

  .nav::-webkit-scrollbar {
    display: block;
    height: 8px;
  }

  .nav a {
    min-height: var(--tap);
    flex: 0 0 auto;
    padding: 10px 12px;
    white-space: nowrap;
  }

  .hero {
    padding: 56px 0 32px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(300px, 0.98fr);
    gap: 34px;
    align-items: center;
  }

  .two-col {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.78fr);
    gap: 22px;
  }

  .hero-actions {
    display: flex;
    flex-wrap: wrap;
  }

  .button {
    width: auto;
  }

  .section {
    padding: 34px 0;
  }

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

  .quick-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .problem-grid,
  .related-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .toc {
    display: block;
    position: sticky;
    top: 92px;
    padding: 16px;
  }

  .toc a {
    min-height: var(--tap);
  }

  .status-row {
    grid-template-columns: 110px 1fr;
    gap: 12px;
    align-items: center;
  }

  .footer-grid {
    grid-template-columns: 1.1fr 1.5fr;
    gap: 28px;
  }

  .footer-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px 18px;
  }

  .site-footer {
    padding: 36px 0 26px;
  }

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

@media (min-width: 1040px) {
  .quick-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }
}