:root {
  --bg: #020b22;
  --panel: rgba(8, 28, 77, 0.72);
  --panel-border: rgba(129, 196, 255, 0.28);
  --text: #f4f8ff;
  --muted: #b7c9ea;
  --brand: #21c0ff;
  --brand-2: #48e2c2;
  --maxw: 1160px;
  --radius: 22px;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Onest", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(33, 192, 255, 0.24) 0, transparent 36%),
    radial-gradient(circle at 90% 10%, rgba(72, 226, 194, 0.18) 0, transparent 42%),
    radial-gradient(circle at 70% 85%, rgba(255, 127, 80, 0.14) 0, transparent 38%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.ambient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(2px 2px at 8% 20%, rgba(255, 255, 255, 0.45) 20%, transparent 70%),
    radial-gradient(2px 2px at 24% 65%, rgba(255, 255, 255, 0.4) 20%, transparent 70%),
    radial-gradient(1.5px 1.5px at 72% 24%, rgba(255, 255, 255, 0.48) 20%, transparent 70%),
    radial-gradient(2px 2px at 86% 72%, rgba(255, 255, 255, 0.38) 20%, transparent 70%),
    radial-gradient(1.5px 1.5px at 58% 52%, rgba(255, 255, 255, 0.36) 20%, transparent 70%);
  opacity: 0.58;
  z-index: -1;
}

a {
  color: inherit;
}

.site-header,
.section,
.site-footer {
  width: min(calc(100% - 2rem), var(--maxw));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.brand::before {
  content: "";
  display: inline-block;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: linear-gradient(160deg, var(--brand) 0%, var(--brand-2) 100%);
  box-shadow: 0 0 0 8px rgba(33, 192, 255, 0.1);
}

.brand-name {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  font-size: 1.38rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.main-nav a {
  text-decoration: none;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.2s ease;
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.58rem 1rem;
  font-size: 0.9rem;
}

.btn-primary {
  background: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 100%);
  color: #03203d;
  padding: 0.82rem 1.25rem;
  box-shadow: 0 10px 24px rgba(33, 192, 255, 0.3);
}

.btn-ghost {
  padding: 0.8rem 1.2rem;
  border: 1px solid rgba(188, 228, 255, 0.35);
  background: rgba(8, 30, 80, 0.3);
  color: var(--text);
}

.btn-outline {
  padding: 0.52rem 0.95rem;
  border: 1px solid rgba(188, 228, 255, 0.4);
  color: var(--text);
}

.section {
  padding: 2.5rem 0;
}

.compact-section {
  padding-top: 1.7rem;
  padding-bottom: 1.7rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
  padding-top: 1.5rem;
}

.eyebrow {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: #8dc8ff;
  font-weight: 700;
  margin: 0 0 0.8rem;
}

h1,
h2,
h3 {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(2rem, 4.4vw, 3.5rem);
  line-height: 1.06;
  margin: 0;
}

.lead {
  color: var(--muted);
  font-size: clamp(1rem, 2.1vw, 1.2rem);
  max-width: 58ch;
  margin-top: 1rem;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin: 1.2rem 0 0.9rem;
}

.hero-points {
  list-style: none;
  padding: 0;
  margin: 0.7rem 0 0;
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
  color: #d8e6ff;
}

.hero-points li {
  padding: 0.35rem 0.68rem;
  border: 1px solid rgba(175, 220, 255, 0.28);
  border-radius: 999px;
  background: rgba(3, 15, 45, 0.38);
  font-size: 0.9rem;
}

.hero-visual {
  position: relative;
}

.visual-card {
  border-radius: var(--radius);
  padding: 1rem;
  border: 1px solid var(--panel-border);
  background: linear-gradient(160deg, rgba(12, 35, 90, 0.76) 0%, rgba(7, 22, 58, 0.8) 100%);
  box-shadow: 0 22px 44px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.visual-card img {
  display: block;
  width: 100%;
  border-radius: 16px;
}

.visual-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-top: 0.8rem;
}

.visual-metrics div {
  border: 1px solid rgba(174, 219, 255, 0.2);
  border-radius: 14px;
  padding: 0.72rem;
  background: rgba(2, 15, 40, 0.45);
}

.visual-metrics span {
  display: block;
  color: #a5c4eb;
  font-size: 0.76rem;
  margin-bottom: 0.22rem;
}

.visual-metrics strong {
  font-size: 0.9rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2.9vw, 2.3rem);
}

.feature-grid {
  margin-top: 1.1rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
}

.feature-card {
  border-radius: 16px;
  padding: 1rem;
  border: 1px solid rgba(173, 220, 255, 0.18);
  background: linear-gradient(180deg, rgba(8, 29, 80, 0.66), rgba(5, 19, 52, 0.72));
}

.feature-card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.feature-card p {
  margin: 0.55rem 0 0;
  color: var(--muted);
}

.platform-list {
  list-style: none;
  padding: 0;
  margin: 1.1rem 0 0;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.7rem;
}

.platform-chip {
  text-align: center;
  padding: 0.7rem 0.5rem;
  border-radius: 12px;
  border: 1px solid rgba(175, 220, 255, 0.24);
  background: rgba(5, 24, 67, 0.58);
  font-weight: 600;
}

.security-panel {
  margin-top: 0.6rem;
  border: 1px solid rgba(173, 220, 255, 0.28);
  border-radius: 18px;
  padding: 1.25rem;
  background: linear-gradient(110deg, rgba(13, 40, 104, 0.72), rgba(14, 76, 100, 0.45));
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.security-panel p {
  margin: 0;
  color: #ddedff;
  max-width: 70ch;
}

.site-footer {
  margin-top: 0.5rem;
  padding: 1.4rem 0 2rem;
  border-top: 1px solid rgba(166, 214, 255, 0.18);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}

.site-footer p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #fff;
}

.content-page .main-content {
  width: min(calc(100% - 2rem), 920px);
  margin-inline: auto;
  padding: 1rem 0 2rem;
}

.content-intro {
  margin-bottom: 1.2rem;
}

.content-intro h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.content-intro p {
  color: var(--muted);
  max-width: 68ch;
}

.policy-card {
  background: linear-gradient(180deg, rgba(10, 32, 90, 0.7), rgba(5, 18, 52, 0.75));
  border: 1px solid rgba(173, 220, 255, 0.2);
  border-radius: 16px;
  padding: 1.2rem;
  margin-bottom: 0.9rem;
}

.policy-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.18rem;
}

.policy-card p {
  margin: 0;
  color: var(--muted);
}

.policy-card p + p {
  margin-top: 0.55rem;
}

.faq-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.faq-item + .faq-item {
  margin-top: 0.55rem;
}

.faq-item details {
  border: 1px solid rgba(173, 220, 255, 0.22);
  border-radius: 14px;
  background: rgba(2, 15, 40, 0.28);
  padding: 0.75rem 0.85rem;
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.faq-item details:hover {
  border-color: rgba(173, 220, 255, 0.38);
  background: rgba(7, 30, 78, 0.36);
  transform: translateY(-1px);
}

.faq-item details:focus-within {
  outline: 2px solid rgba(33, 192, 255, 0.35);
  outline-offset: 2px;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  font-weight: 500;
  color: #e4f0ff;
  position: relative;
  padding-right: 2.6rem;
  user-select: none;
}

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

.faq-item summary::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 1.9rem;
  height: 1.9rem;
  transform: translateY(-50%);
  border-radius: 999px;
  border: 1px solid rgba(173, 220, 255, 0.24);
  background: rgba(3, 15, 45, 0.28);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.faq-item summary::before {
  content: "";
  position: absolute;
  right: 0.7rem;
  top: 50%;
  width: 0.55rem;
  height: 0.55rem;
  border-right: 2px solid #8fbdf3;
  border-bottom: 2px solid #8fbdf3;
  transform: translateY(-55%) rotate(45deg);
  transition: transform 0.2s ease;
  pointer-events: none;
}

.faq-item details:hover summary::after {
  border-color: rgba(173, 220, 255, 0.38);
  background: rgba(7, 30, 78, 0.32);
}

.faq-item details[open] summary::before {
  transform: translateY(-45%) rotate(-135deg);
}

.faq-item details[open] {
  border-color: rgba(72, 226, 194, 0.28);
  background: rgba(7, 30, 78, 0.42);
}

.faq-item p {
  margin-top: 0.4rem;
}

.policy-sections {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: policy-section;
}

.policy-sections > li {
  counter-increment: policy-section;
  counter-reset: policy-point;
}

.policy-sections > li > h2::before {
  content: counter(policy-section) ". ";
}

.policy-points {
  margin: 0;
  padding-left: 0;
  list-style: none;
  color: var(--muted);
}

.policy-points > li {
  counter-increment: policy-point;
  padding-left: 0.2rem;
}

.policy-points > li::before {
  content: counter(policy-section) "." counter(policy-point) ". ";
  color: #cde7ff;
  font-weight: 600;
}

.policy-points > li + li {
  margin-top: 0.55rem;
}

.policy-points .policy-list {
  margin-top: 0.5rem;
}

.policy-list {
  margin: 0.55rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.policy-list li + li {
  margin-top: 0.32rem;
}

.video-frame {
  margin-top: 0.8rem;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(173, 220, 255, 0.22);
}

.video-frame video {
  display: block;
  width: 100%;
  height: auto;
  background: #061437;
}

.video-hint {
  margin-top: 0.65rem;
  font-size: 0.9rem;
}

.video-hint code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: rgba(125, 186, 255, 0.15);
  border: 1px solid rgba(173, 220, 255, 0.28);
  border-radius: 7px;
  padding: 0.08rem 0.35rem;
  color: #d8ecff;
}

.instruction-block {
  margin-bottom: 1.6rem;
}

.instruction-block-title {
  font-size: 1.25rem;
  margin: 0 0 1rem;
  color: #d8e6ff;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.9rem;
}

.step-tile {
  background: linear-gradient(180deg, rgba(10, 32, 90, 0.7), rgba(5, 18, 52, 0.75));
  border: 1px solid rgba(173, 220, 255, 0.2);
  border-radius: 16px;
  padding: 1rem;
  margin: 0;
}

.step-num {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand);
  margin-bottom: 0.5rem;
}

.step-tile p {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.step-tile img {
  max-width: 100%;
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 1px solid rgba(173, 220, 255, 0.25);
  object-fit: contain;
}

.instruction-note {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.instruction-note strong {
  color: #d8e6ff;
}

.back-link {
  display: inline-flex;
  margin-top: 0.8rem;
  color: #aee3ff;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  color: #ffffff;
}

@media (max-width: 1120px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .guide-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

@media (max-width: 760px) {
  .site-header {
    flex-wrap: wrap;
    row-gap: 0.7rem;
  }

  .site-header .btn-outline {
    order: 4;
    width: 100%;
    justify-content: center;
    margin-left: 0;
    padding: 0.58rem 0.9rem;
    font-size: 0.86rem;
  }

  .main-nav {
    order: 3;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
    padding: 0.15rem 0;
  }

  .main-nav a {
    min-height: 2.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    white-space: normal;
    padding: 0.44rem 0.6rem;
    border-radius: 12px;
    border: 1px solid rgba(173, 220, 255, 0.24);
    background: rgba(7, 30, 78, 0.52);
    line-height: 1.2;
    font-size: 0.9rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

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

  .guide-grid {
    grid-template-columns: 1fr;
  }

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

  .visual-metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .brand-name {
    font-size: 1.2rem;
  }

  .main-nav {
    grid-template-columns: 1fr;
  }

  .main-nav a {
    padding: 0.5rem 0.65rem;
    font-size: 0.88rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-copy,
  .hero-visual,
  .feature-card,
  .platform-chip,
  .security-panel,
  .policy-card {
    animation: slide-up 0.75s ease both;
  }

  .hero-visual {
    animation-delay: 0.08s;
  }

  .feature-card:nth-child(2),
  .platform-chip:nth-child(2) {
    animation-delay: 0.11s;
  }

  .feature-card:nth-child(3),
  .platform-chip:nth-child(3) {
    animation-delay: 0.16s;
  }
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}