:root {
  --bg-1: #0a0f15;
  --bg-2: #111722;
  --bg-3: #0e141d;
  --surface: rgba(18, 24, 33, 0.9);
  --surface-soft: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.075);
  --border: rgba(255, 255, 255, 0.1);
  --text: #edf3fb;
  --muted: #b4c4d6;
  --heading: #ffffff;
  --run: #4caf50;
  --setup: #fec306;
  --tutorial: #f69200;
  --protection: #418ab3;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.34);
  --radius: 22px;
  --radius-sm: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(65, 138, 179, 0.2), transparent 34%),
    radial-gradient(circle at 82% 14%, rgba(246, 146, 0, 0.18), transparent 30%),
    linear-gradient(180deg, var(--bg-1) 0%, var(--bg-2) 55%, var(--bg-3) 100%);
}

a {
  color: inherit;
}

.page-shell {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 20px 72px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--heading);
  text-decoration: none;
}

.brand-mark {
  width: 50px;
  height: 50px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--tutorial), var(--setup) 56%, var(--protection));
  color: #151a22;
  font-size: 0.96rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  box-shadow: 0 18px 28px rgba(0, 0, 0, 0.28);
}

.brand-copy strong {
  display: block;
  font-size: 1.04rem;
}

.brand-copy span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.87rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav-links a {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background: var(--surface-strong);
  border-color: rgba(255, 255, 255, 0.18);
  color: var(--heading);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(246, 146, 0, 0.35);
  background: rgba(246, 146, 0, 0.14);
  color: #ffd59a;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 34px;
  align-items: center;
  padding: 16px 0 40px;
}

.page-hero {
  display: grid;
  gap: 18px;
  padding: 16px 0 28px;
}

.hero-title,
.page-hero h1 {
  margin: 18px 0 14px;
  color: var(--heading);
  line-height: 1.04;
}

.hero-title {
  font-size: clamp(2.35rem, 5vw, 4.75rem);
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3.35rem);
}

.hero-subtitle,
.page-hero p {
  max-width: 70ch;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

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

.button.primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--tutorial), #ed7d31);
  box-shadow: 0 18px 34px rgba(246, 146, 0, 0.22);
}

.button.secondary {
  color: var(--heading);
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--border);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.hero-meta span,
.tag {
  display: inline-flex;
  align-items: center;
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: #dce8f5;
  font-size: 0.93rem;
}

.shell-preview {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.085), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 28px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.preview-chrome {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding: 12px 16px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  background: #0f141c;
  color: #dce7f4;
}

.preview-dots {
  display: flex;
  gap: 6px;
}

.preview-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.preview-dot.run {
  background: var(--run);
}

.preview-dot.setup {
  background: var(--setup);
}

.preview-dot.tutorial {
  background: var(--tutorial);
}

.preview-title {
  font-size: 0.9rem;
  font-weight: 700;
}

.preview-pane {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, #161c24, #10151d);
}

.preview-card {
  padding: 18px;
  border-radius: 18px;
  background: #fafafa;
  color: #222;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
}

.preview-card h3 {
  margin: 0 0 12px;
  color: #333;
  font-size: 1.06rem;
}

.preview-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.preview-chip {
  display: inline-flex;
  padding: 10px 14px;
  border-radius: 10px;
  color: #fff;
  font-size: 0.87rem;
  font-weight: 700;
}

.preview-chip.run {
  background: var(--run);
}

.preview-chip.setup {
  background: var(--setup);
  color: #2b2b2b;
}

.preview-chip.tutorial {
  background: var(--tutorial);
}

.preview-chip.protection {
  background: var(--protection);
}

.section-block {
  margin-top: 30px;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0 0 8px;
  color: var(--heading);
  font-size: clamp(1.55rem, 2vw, 2rem);
}

.section-heading p {
  margin: 0;
  max-width: 72ch;
  color: var(--muted);
  line-height: 1.7;
}

.surface-card,
.feature-card,
.resource-card,
.step-card,
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.surface-card,
.feature-card,
.step-card,
.contact-card {
  padding: 22px;
}

.surface-card h2,
.surface-card h3,
.feature-card h3,
.step-card h3,
.resource-card h3,
.contact-card h3 {
  margin: 0 0 12px;
  color: var(--heading);
}

.surface-card p,
.surface-card li,
.feature-card p,
.step-card p,
.resource-card p,
.contact-card p,
.contact-card li {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.surface-card ul,
.contact-card ul {
  margin: 0;
  padding-left: 18px;
}

.feature-grid,
.resource-grid,
.contact-grid,
.workflow-strip,
.two-column {
  display: grid;
  gap: 18px;
}

.feature-grid,
.resource-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.contact-grid,
.workflow-strip,
.two-column {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.feature-card {
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--accent);
}

.feature-card.run {
  --accent: var(--run);
}

.feature-card.setup {
  --accent: var(--setup);
}

.feature-card.tutorial {
  --accent: var(--tutorial);
}

.feature-card.protection {
  --accent: var(--protection);
}

.clean-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.clean-list li {
  position: relative;
  padding-left: 18px;
  color: #dce6f1;
  line-height: 1.55;
  font-size: 0.95rem;
}

.clean-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
}

.emphasis {
  background: linear-gradient(135deg, rgba(65, 138, 179, 0.18), rgba(255, 255, 255, 0.05));
}

.tag-row,
.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-row {
  margin-top: 16px;
}

.resource-card {
  display: block;
  padding: 22px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.resource-card:hover,
.resource-card:focus-visible {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.065);
  border-color: rgba(255, 255, 255, 0.18);
}

.resource-card .accent {
  display: inline-flex;
  margin-bottom: 10px;
  color: #ffce8a;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.step-number {
  display: inline-flex;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  border-radius: 50%;
  border: 1px solid rgba(246, 146, 0, 0.35);
  background: rgba(246, 146, 0, 0.14);
  color: #ffd59a;
  font-weight: 800;
}

.callout {
  padding: 20px 22px;
  border-radius: 18px;
  border: 1px solid rgba(246, 146, 0, 0.2);
  background: rgba(246, 146, 0, 0.1);
  color: #fff;
  line-height: 1.7;
}

.callout strong {
  color: #fff5e6;
}

.contact-card a,
.inline-links a,
.site-footer a {
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
}

.contact-card a:hover,
.inline-links a:hover,
.site-footer a:hover {
  text-decoration: underline;
}

.notice-label {
  display: inline-flex;
  margin-bottom: 10px;
  color: #b7cbe0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: #fff3d0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 18px 16px 56px;
  }

  .topbar {
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
  }

  .hero-title {
    font-size: clamp(2.1rem, 8vw, 3.3rem);
  }

  .page-hero h1 {
    font-size: clamp(1.9rem, 7vw, 2.8rem);
  }

  .preview-chip-row,
  .hero-actions,
  .inline-links,
  .tag-row,
  .hero-meta {
    gap: 8px;
  }
}