:root {
  --accent: #3d86c6;
  --accent-rgb: 61, 134, 198;
  --bg: #eaf2fa;
  --bg-soft: #f5f9fd;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --text: #10243d;
  --muted: #63768b;
  --navy: #111a2a;
  --border: rgba(92, 124, 158, 0.22);
  --border-strong: rgba(82, 116, 153, 0.32);
  --shadow: 0 24px 74px rgba(31, 55, 85, 0.14);
  --shadow-soft: 0 14px 42px rgba(31, 55, 85, 0.1);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background:
    linear-gradient(
      120deg,
      #f8fcff 0%,
      #eaf4ff 20%,
      #dcebf8 42%,
      #edf6f8 62%,
      #f6fbff 82%,
      #e7f1fb 100%
    );
  background-size: 280% 280%;
  animation: slowPageGradient 58s ease-in-out infinite;
}

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

button {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.home-shell,
.guide-shell,
.site-footer {
  width: min(1240px, calc(100% - 40px));
  margin-inline: auto;
}

.home-shell {
  padding: 72px 0 78px;
}

.intro {
  max-width: 760px;
  margin-bottom: 30px;
}

.brand-intro {
  display: grid;
  justify-items: start;
  max-width: 620px;
  margin: 0 0 34px;
  padding: 0 0 clamp(18px, 3vw, 30px);
}

.brand-intro::after {
  display: block;
  width: min(360px, 66vw);
  height: 1px;
  margin-top: clamp(16px, 2.4vw, 24px);
  content: "";
  background: linear-gradient(
    90deg,
    rgba(var(--accent-rgb), 0.34),
    rgba(16, 36, 61, 0.16),
    transparent
  );
}

.home-logo {
  display: block;
  width: min(360px, 72vw);
  height: auto;
  filter: drop-shadow(0 14px 26px rgba(16, 36, 61, 0.14));
  transform: translateX(-17%);
  transform-origin: left center;
}

.brand-description {
  max-width: 560px;
  margin: 18px 0 0;
  color: #4d6680;
  font-size: clamp(1rem, 1.45vw, 1.12rem);
  font-weight: 500;
  line-height: 1.65;
}

.intro h1,
.guide-hero h1 {
  margin: 0;
  color: #0d2037;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 700;
  line-height: 0.95;
}

.intro h1 {
  max-width: 700px;
  font-size: clamp(3.2rem, 8vw, 6.4rem);
}

.intro p,
.guide-hero p,
.option-card p,
.step-card p,
.note-card p,
.check-card li,
.guide-panel li,
.site-footer {
  color: var(--muted);
  line-height: 1.65;
}

.intro p {
  max-width: 620px;
  margin: 18px 0 0;
  font-size: 1.08rem;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.option-card,
.guide-panel,
.step-card,
.note-card,
.check-card {
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.option-card {
  display: flex;
  min-height: 260px;
  flex-direction: column;
  border-radius: 16px;
  padding: 24px;
}

.option-card > svg,
.browser-icon,
.guide-icon,
.step-number {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  margin-bottom: 22px;
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 13px;
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent);
}

.browser-icon {
  display: block;
  padding: 6px;
  object-fit: contain;
}

.option-card h2 {
  margin: 0;
  color: #122842;
  font-size: 1.18rem;
  line-height: 1.25;
}

.option-card p {
  margin: 12px 0 24px;
  font-size: 0.98rem;
}

.card-button {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  width: fit-content;
  margin-top: auto;
  color: #173f70;
  font-size: 0.95rem;
  font-weight: 800;
}

.card-button svg,
.guide-meta svg {
  width: 17px;
  height: 17px;
  stroke-width: 2;
}

.guide-shell {
  padding: 72px 0 80px;
}

.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
  margin-bottom: 26px;
}

.guide-hero h1 {
  max-width: 820px;
  font-size: clamp(2.7rem, 6.4vw, 5.4rem);
}

.guide-hero p {
  max-width: 760px;
  margin: 16px 0 0;
  font-size: 1.06rem;
}

.guide-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.guide-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 12px;
  background: rgba(255, 255, 255, 0.56);
  color: #294e72;
  font-size: 0.88rem;
  font-weight: 800;
}

.guide-brand-hero {
  display: block;
  margin-bottom: 30px;
}

.guide-brand-copy {
  display: grid;
  justify-items: start;
  max-width: 760px;
}

.guide-brand-logo {
  display: block;
  width: min(380px, 74vw);
  height: auto;
  filter: drop-shadow(0 16px 28px rgba(16, 36, 61, 0.14));
  transform: translateX(-17%);
  transform-origin: left center;
}

.guide-brand-copy > p {
  max-width: 680px;
  margin: 18px 0 0;
  color: #4d6680;
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  font-weight: 500;
  line-height: 1.65;
}

.guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.primary-store-link,
.inline-store-link {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  font-weight: 800;
}

.primary-store-link {
  gap: 10px;
  border: 1px solid rgba(var(--accent-rgb), 0.3);
  border-radius: 14px;
  padding: 13px 16px;
  background: rgba(255, 255, 255, 0.7);
  color: #143d67;
  box-shadow: var(--shadow-soft);
}

.primary-store-link img {
  width: 24px;
  height: 24px;
}

.primary-store-link svg,
.inline-store-link svg {
  width: 17px;
  height: 17px;
}

.inline-store-link {
  gap: 8px;
  margin-top: 12px;
  color: #216da9;
  font-size: 0.92rem;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 18px;
}

.guide-panel {
  overflow: hidden;
  border-radius: 18px;
}

.panel-heading {
  display: flex;
  align-items: center;
  gap: 0;
  min-height: 66px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.54);
}

.panel-heading h2 {
  margin: 0;
  color: #132a45;
  font-size: 1.05rem;
  line-height: 1.2;
}

.step-list {
  display: grid;
  gap: 12px;
  padding: 18px;
}

.step-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  border-radius: 14px;
  padding: 16px;
  box-shadow: none;
}

.step-number {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 800;
}

.step-card h3,
.note-card h3,
.check-card h3 {
  margin: 0;
  color: #142b46;
  font-size: 1rem;
}

.step-card p {
  margin: 7px 0 0;
  font-size: 0.95rem;
}

.store-guide .guide-panel {
  box-shadow: 0 30px 90px rgba(31, 55, 85, 0.13);
}

.store-guide .panel-heading {
  min-height: 76px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.72), rgba(232, 244, 255, 0.48)),
    rgba(255, 255, 255, 0.56);
}

.store-guide .step-list {
  gap: 14px;
  padding: 22px;
}

.store-guide .step-card {
  position: relative;
  border-color: rgba(76, 124, 171, 0.24);
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 10px 26px rgba(31, 55, 85, 0.06);
}

.store-guide .step-number {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: inset 0 0 0 1px rgba(var(--accent-rgb), 0.2);
}

.side-stack {
  display: grid;
  gap: 14px;
}

.note-card,
.check-card {
  border-radius: 16px;
  padding: 18px;
}

.note-card p {
  margin: 9px 0 0;
  font-size: 0.94rem;
}

.check-card ul,
.guide-panel ul {
  margin: 12px 0 0;
  padding-left: 1.1rem;
}

.check-card li,
.guide-panel li {
  margin: 9px 0;
  font-size: 0.94rem;
}

.warning {
  border-color: rgba(217, 128, 95, 0.28);
  background: rgba(255, 246, 241, 0.72);
}

.success {
  border-color: rgba(47, 170, 160, 0.28);
  background: rgba(244, 255, 253, 0.72);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 28px 0 42px;
  border-top: 1px solid var(--border);
  font-size: 0.92rem;
}

.site-footer a {
  border: 1px solid rgba(var(--accent-rgb), 0.24);
  border-radius: 999px;
  padding: 9px 13px;
  background: rgba(var(--accent-rgb), 0.08);
  color: #173f65;
  font-size: 0.9rem;
  font-weight: 800;
}

.quiet-label {
  margin: 0 0 12px;
  color: #315d83;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.footer-credit {
  margin: 0;
  color: #516b85;
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  animation: footerFade 2.8s ease-in-out infinite;
}

.footer-credit span {
  color: #2f83bf;
}

@media (max-width: 960px) {
  .option-grid,
  .guide-layout,
  .guide-hero {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 640px) {
  .home-shell,
  .guide-shell,
  .site-footer {
    width: min(100% - 28px, 680px);
  }

  .home-shell {
    padding-top: 48px;
  }

  .brand-intro {
    margin-bottom: 28px;
    padding-bottom: 24px;
  }

  .home-logo {
    width: min(300px, 78vw);
  }

  .brand-description {
    font-size: 1rem;
  }

  .guide-shell {
    padding-top: 48px;
  }

  .guide-brand-logo {
    width: min(310px, 82vw);
  }

  .primary-store-link {
    width: 100%;
    justify-content: center;
  }

  .intro h1,
  .guide-hero h1 {
    font-size: clamp(2.9rem, 14vw, 4.25rem);
  }

  .option-card {
    min-height: 230px;
    padding: 22px;
  }

  .step-card {
    grid-template-columns: 1fr;
  }

  .store-guide .step-list {
    padding: 16px;
  }

  .step-number {
    width: 36px;
    height: 36px;
  }

  .site-footer {
    text-align: center;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .option-card,
  .card-button svg,
  .primary-store-link,
  .inline-store-link svg,
  .store-guide .step-card {
    transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
  }

  .option-card:hover,
  .primary-store-link:hover,
  .store-guide .step-card:hover {
    transform: translateY(-2px);
  }

  .card-button:hover svg,
  .inline-store-link:hover svg {
    transform: translateX(3px);
  }
}

@media (prefers-reduced-motion: reduce) {
  body::before {
    animation: none;
    background-position: 50% 50%;
  }

  .footer-credit {
    animation: none;
  }
}

@keyframes slowPageGradient {
  0% {
    background-position: 0% 42%;
  }

  35% {
    background-position: 68% 58%;
  }

  70% {
    background-position: 100% 40%;
  }

  100% {
    background-position: 0% 42%;
  }
}

@keyframes footerFade {
  0%,
  100% {
    opacity: 0.46;
  }

  50% {
    opacity: 1;
  }
}