:root {
  --bg: #eaf4f7;
  --bg-deep: #dcecf2;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: rgba(255, 255, 255, 0.94);
  --surface: rgba(231, 243, 248, 0.74);
  --text: #0e2c3d;
  --muted: #577283;
  --line: rgba(42, 89, 114, 0.18);
  --line-strong: rgba(42, 89, 114, 0.34);
  --accent: #ff7a3d;
  --accent-soft: rgba(255, 122, 61, 0.14);
  --ice: #7ad6ef;
  --ice-soft: rgba(122, 214, 239, 0.16);
  --shadow: 0 24px 90px rgba(60, 104, 131, 0.18);
  --max-width: 1240px;
  --display-font: "Avenir Next Condensed", "Avenir Next", "Trebuchet MS", sans-serif;
  --body-font: "Avenir Next", "Avenir", "Segoe UI", sans-serif;
  --mono-font: "SF Mono", "SFNSMono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  font-family: var(--body-font);
  background:
    radial-gradient(circle at top left, rgba(122, 214, 239, 0.18), transparent 24%),
    radial-gradient(circle at 90% 16%, rgba(255, 122, 61, 0.1), transparent 18%),
    linear-gradient(180deg, #eef7fa 0%, #e8f3f7 42%, #ddebf0 100%);
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

body::before {
  background-image:
    linear-gradient(rgba(24, 65, 91, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 65, 91, 0.045) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.88), transparent 78%);
}

body::after {
  background:
    radial-gradient(circle at 18% 26%, rgba(255, 255, 255, 0.54) 0 3px, transparent 4px),
    radial-gradient(circle at 72% 30%, rgba(255, 255, 255, 0.4) 0 2px, transparent 3px),
    radial-gradient(circle at 80% 68%, rgba(255, 255, 255, 0.42) 0 2px, transparent 3px),
    radial-gradient(circle at 32% 76%, rgba(255, 255, 255, 0.48) 0 3px, transparent 4px);
  opacity: 0.7;
}

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

a {
  color: inherit;
}

a,
button,
summary {
  transition:
    transform 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease,
    opacity 180ms ease;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3.5rem;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: var(--text);
  color: white;
  z-index: 20;
}

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

.site-shell {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
  padding-bottom: 3rem;
}

.panel {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel-strong), var(--panel));
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.section {
  margin-top: 4rem;
  scroll-margin-top: 6rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0 0.75rem;
  background: linear-gradient(180deg, rgba(234, 244, 247, 0.96), rgba(234, 244, 247, 0.76));
}

.site-header.is-scrolled {
  backdrop-filter: blur(16px);
}

.brand {
  width: min(18rem, 56vw);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
}

.site-nav a {
  padding: 0.72rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(42, 89, 114, 0.14);
  background: rgba(255, 255, 255, 0.58);
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a[aria-current="true"] {
  color: var(--text);
  border-color: rgba(255, 122, 61, 0.32);
  box-shadow: 0 10px 24px rgba(42, 89, 114, 0.1);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: 1.5rem;
  padding: 1.35rem;
  border-radius: 2rem;
  overflow: hidden;
}

.hero-copy,
.hero-visual {
  border-radius: 1.55rem;
}

.hero-copy {
  padding: 2.4rem;
  background:
    linear-gradient(140deg, rgba(255, 255, 255, 0.88), rgba(235, 246, 250, 0.9)),
    radial-gradient(circle at top right, rgba(255, 122, 61, 0.08), transparent 24%);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 28rem;
  padding: 1rem;
  background:
    linear-gradient(180deg, rgba(214, 233, 241, 0.92), rgba(236, 246, 250, 0.72)),
    radial-gradient(circle at center, rgba(122, 214, 239, 0.18), transparent 60%);
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--display-font);
  font-weight: 700;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(3.2rem, 6vw, 5.25rem);
  line-height: 0.92;
}

h2 {
  font-size: clamp(2rem, 3vw, 2.85rem);
  line-height: 0.96;
}

h3 {
  font-size: 1.45rem;
  line-height: 1;
}

p,
li {
  line-height: 1.65;
}

.hero-lede {
  margin: 1.2rem 0 0;
  max-width: 42rem;
  font-size: 1.22rem;
  color: var(--text);
}

.hero-support {
  margin: 1rem 0 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--text);
  color: white;
}

.button-primary:hover {
  box-shadow: 0 14px 30px rgba(14, 44, 61, 0.2);
}

.button-secondary {
  border-color: rgba(42, 89, 114, 0.18);
  background: rgba(255, 255, 255, 0.76);
  color: var(--text);
}

.notice-banner {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.55rem;
  padding: 0.8rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(42, 89, 114, 0.12);
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
}

.notice-dot {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: linear-gradient(180deg, var(--accent), #ffb16c);
  box-shadow: 0 0 0 6px var(--accent-soft);
}

.signal-stage {
  position: relative;
  width: min(100%, 29rem);
  aspect-ratio: 1;
  border-radius: 2rem;
  border: 1px solid rgba(42, 89, 114, 0.15);
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.72), rgba(226, 241, 247, 0.48) 46%, rgba(215, 233, 240, 0.82) 100%);
  overflow: hidden;
}

.signal-grid,
.signal-ring,
.signal-scan,
.signal-core,
.signal-label,
.signal-chip {
  position: absolute;
}

.signal-grid {
  inset: 0;
  background-image:
    linear-gradient(rgba(21, 64, 88, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 64, 88, 0.06) 1px, transparent 1px);
  background-size: 11% 11%;
}

.signal-ring {
  border-radius: 50%;
  border: 1px solid rgba(21, 64, 88, 0.16);
}

.signal-ring-large {
  inset: 14%;
}

.signal-ring-medium {
  inset: 27%;
}

.signal-ring-small {
  inset: 40%;
}

.signal-scan {
  inset: -10%;
  background: conic-gradient(from 45deg, rgba(255, 255, 255, 0) 0deg, rgba(122, 214, 239, 0.28) 70deg, rgba(255, 255, 255, 0) 120deg);
  border-radius: 50%;
  animation: sweep 12s linear infinite;
}

.signal-core {
  inset: 43%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 32% 32%, white 0 22%, rgba(255, 255, 255, 0) 23%),
    radial-gradient(circle at center, rgba(122, 214, 239, 0.9), rgba(122, 214, 239, 0.34) 58%, rgba(122, 214, 239, 0) 72%);
  box-shadow:
    0 0 0 18px rgba(122, 214, 239, 0.12),
    0 0 60px rgba(122, 214, 239, 0.32);
}

.signal-label,
.signal-chip {
  padding: 0.45rem 0.72rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(42, 89, 114, 0.14);
  font-family: var(--mono-font);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.signal-label-top {
  top: 9%;
  left: 50%;
  transform: translateX(-50%);
}

.signal-label-bottom {
  bottom: 9%;
  left: 50%;
  transform: translateX(-50%);
}

.signal-chip-left {
  left: 6%;
  bottom: 24%;
}

.signal-chip-right {
  right: 6%;
  top: 25%;
}

.section-heading {
  max-width: 48rem;
  margin-bottom: 1.5rem;
}

.section-heading p:last-child {
  margin-top: 1rem;
  color: var(--muted);
}

.facts-grid,
.comparison-grid,
.checklist-grid,
.reference-grid {
  display: grid;
  gap: 1rem;
}

.facts-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.fact-card {
  min-height: 15.2rem;
  padding: 1.4rem;
  border-radius: 1.4rem;
}

.fact-label,
.compare-kicker,
.note-label,
.reference-label {
  margin: 0 0 1rem;
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.fact-card h3 {
  margin-top: 0.5rem;
}

.fact-card p:last-child {
  color: var(--muted);
}

.comparison-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.compare-card {
  min-height: 24rem;
  padding: 1.6rem;
  border-radius: 1.5rem;
}

.compare-card ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.compare-card-watch {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(233, 246, 250, 0.84));
}

.compare-card-warning {
  background: linear-gradient(180deg, rgba(255, 250, 246, 0.96), rgba(255, 238, 225, 0.86));
}

.compare-card-frost {
  background: linear-gradient(180deg, rgba(249, 253, 255, 0.96), rgba(237, 246, 251, 0.88));
}

.note-card {
  margin-top: 1rem;
  padding: 1.2rem 1.35rem;
  border-radius: 1.25rem;
  background:
    linear-gradient(135deg, rgba(16, 52, 75, 0.94), rgba(24, 67, 92, 0.92)),
    radial-gradient(circle at right top, rgba(122, 214, 239, 0.22), transparent 30%);
  color: rgba(245, 252, 255, 0.92);
}

.note-card p {
  margin: 0;
}

.note-card .note-label {
  color: rgba(196, 231, 244, 0.78);
}

.checklist-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.checklist-card {
  min-height: 15rem;
  padding: 1.4rem;
  border-radius: 1.4rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(236, 246, 250, 0.88)),
    radial-gradient(circle at top left, rgba(122, 214, 239, 0.1), transparent 36%);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3rem;
  padding: 0.45rem 0.65rem;
  border-radius: 999px;
  background: rgba(16, 52, 75, 0.08);
  color: var(--text);
  font-family: var(--mono-font);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
}

.checklist-card h3 {
  margin-top: 1rem;
}

.checklist-card p {
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 0.8rem;
}

.faq-list details {
  border-radius: 1.2rem;
  overflow: hidden;
}

.faq-list summary {
  list-style: none;
  cursor: pointer;
  padding: 1.1rem 1.2rem;
  font-family: var(--display-font);
  font-size: 1.25rem;
}

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

.faq-list details p {
  margin: 0;
  padding: 0 1.2rem 1.2rem;
  color: var(--muted);
}

.site-footer {
  margin-top: 4rem;
  padding: 1.5rem;
  border-radius: 2rem;
}

.reference-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.5rem;
}

.reference-card {
  display: grid;
  gap: 0.55rem;
  padding: 1.2rem;
  border-radius: 1.25rem;
  border: 1px solid rgba(42, 89, 114, 0.14);
  background: rgba(255, 255, 255, 0.64);
  text-decoration: none;
}

.reference-card strong {
  font-family: var(--display-font);
  font-size: 1.3rem;
}

.reference-card span:last-child {
  color: var(--muted);
}

.reference-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 122, 61, 0.24);
  box-shadow: 0 16px 32px rgba(42, 89, 114, 0.12);
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.6rem;
  padding-top: 1.3rem;
  border-top: 1px solid rgba(42, 89, 114, 0.1);
}

.footer-meta p {
  margin: 0;
  color: var(--muted);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 500ms ease,
    transform 500ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes sweep {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

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

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

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .facts-grid,
  .comparison-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .checklist-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-shell {
    width: min(var(--max-width), calc(100% - 1rem));
  }

  .site-header {
    gap: 0.8rem;
    padding-top: 0.75rem;
    flex-direction: column;
    align-items: stretch;
  }

  .brand {
    width: min(18rem, 100%);
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero,
  .site-footer {
    padding: 1rem;
    border-radius: 1.35rem;
  }

  .hero-copy,
  .hero-visual,
  .fact-card,
  .compare-card,
  .checklist-card,
  .reference-card,
  .faq-list details {
    border-radius: 1.15rem;
  }

  .hero-copy {
    padding: 1.55rem;
  }

  .hero-visual {
    min-height: 21rem;
  }

  .notice-banner {
    border-radius: 1rem;
    align-items: flex-start;
  }

  .facts-grid,
  .comparison-grid,
  .checklist-grid,
  .reference-grid {
    grid-template-columns: 1fr;
  }

  .faq-list summary {
    font-size: 1.1rem;
  }

  .footer-meta {
    align-items: flex-start;
  }
}