:root {
  --bg: #0f172a;
  --bg-soft: #111c2f;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --surface: rgba(15, 23, 42, 0.75);
  --surface-light: rgba(255, 255, 255, 0.08);
  --text-primary: #e2e8f0;
  --text-muted: #cbd5f5;
  --border: rgba(148, 163, 184, 0.25);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(140deg, #020617 0%, #0b1221 55%, #111c2f 100%);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 13, 25, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.brand img {
  width: 42px;
  height: 42px;
}

nav {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

nav a:hover,
nav a:focus {
  color: var(--accent);
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.3s ease, border 0.3s ease;
}

.cta-btn.primary {
  background: linear-gradient(120deg, var(--accent-strong), #6366f1);
  color: #0f172a;
  box-shadow: 0 20px 40px rgba(14, 165, 233, 0.35);
}

.cta-btn.primary:hover,
.cta-btn.primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 28px 50px rgba(14, 165, 233, 0.5);
}

.cta-btn.ghost {
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.cta-btn.ghost:hover,
.cta-btn.ghost:focus {
  color: var(--accent);
  border-color: var(--accent);
}

.hero {
  position: relative;
  padding: 6rem 0 4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2.5rem;
  align-items: start;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.74rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  line-height: 1.15;
  color: #f8fafc;
}

.lead {
  font-size: 1.1rem;
  color: rgba(226, 232, 240, 0.9);
  max-width: 680px;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0 2.5rem;
}

.hero-points {
  margin: 0;
  padding-left: 1.1rem;
  color: rgba(226, 232, 240, 0.85);
}

.hero-aside {
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.45);
}

.hero-aside h2 {
  margin-top: 0;
}

.hero-aside ul {
  padding-left: 1.1rem;
  margin: 1rem 0 1.5rem;
}

.note {
  color: rgba(226, 232, 240, 0.7);
  font-style: italic;
}

.hero-blob {
  position: absolute;
  inset: auto -180px -220px auto;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.35), transparent 65%);
  filter: blur(80px);
  z-index: -1;
}

.section {
  padding: 5rem 0;
}

.section h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  margin-bottom: 1.5rem;
  color: #f8fafc;
}

.overview-grid,
.resource-grid,
.faq-items,
.howto-list {
  display: grid;
  gap: 1.5rem;
}

.overview-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.overview-card,
.resource-grid article {
  background: rgba(30, 41, 59, 0.65);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.45);
}

.overview-card h3,
.resource-grid h3 {
  margin-top: 0;
  color: #f8fafc;
}

.overview-card ul {
  padding-left: 1.2rem;
  margin: 1rem 0 0;
}

.howto-list {
  counter-reset: steps;
  list-style: none;
  padding: 0;
}

.howto-list li {
  position: relative;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--border);
  border-radius: 26px;
  padding: 2.25rem 2rem 2rem;
  box-shadow: 0 30px 55px rgba(15, 23, 42, 0.5);
}

.howto-list li::before {
  counter-increment: steps;
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  top: -22px;
  left: 24px;
  background: linear-gradient(120deg, rgba(56, 189, 248, 0.9), rgba(99, 102, 241, 0.9));
  color: #0f172a;
  font-weight: 700;
  border-radius: 50px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.howto-list h3 {
  margin-top: 0;
}

.detail {
  color: rgba(226, 232, 240, 0.75);
  font-style: italic;
}

.step-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.step-link::after {
  content: '↗';
  font-size: 0.9rem;
}

.blueprint {
  background: rgba(12, 21, 36, 0.85);
}

.two-column {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  align-items: start;
}

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(15, 23, 42, 0.7);
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
}

thead th {
  background: rgba(56, 189, 248, 0.12);
  color: #f8fafc;
  padding: 1rem;
  text-align: left;
}

tbody td {
  padding: 0.95rem 1rem;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
}

.callout {
  background: rgba(30, 41, 59, 0.65);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.5);
}

.callout ul {
  padding-left: 1.2rem;
  margin: 1rem 0 1.8rem;
}

.resource-tip {
  color: rgba(226, 232, 240, 0.7);
  font-style: italic;
  margin-top: 1rem;
}

.alt-cta {
  text-align: center;
  background: radial-gradient(circle at top right, rgba(236, 72, 153, 0.18), transparent 55%),
    radial-gradient(circle at bottom left, rgba(56, 189, 248, 0.2), transparent 60%),
    rgba(12, 21, 36, 0.85);
}

.faq-items details {
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.25rem 1.5rem;
  transition: border 0.3s ease;
}

.faq-items summary {
  cursor: pointer;
  font-weight: 600;
}

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

.faq-items details[open] {
  border-color: var(--accent);
}

footer {
  background: rgba(5, 10, 20, 0.92);
  border-top: 1px solid var(--border);
  color: rgba(148, 163, 184, 0.9);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2.5rem 0;
  gap: 2rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: rgba(148, 163, 184, 0.9);
}

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

@media (max-width: 900px) {
  .nav-container {
    flex-wrap: wrap;
  }

  nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .cta-btn.primary {
    order: 2;
  }
}

@media (max-width: 720px) {
  .cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  table {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}