:root {
  --bg: #071012;
  --panel: #101b1f;
  --panel-2: #142429;
  --text: #eef8f6;
  --muted: #a8bbb8;
  --line: rgba(188, 255, 237, 0.18);
  --green: #58cc02;
  --cyan: #1cb0f6;
  --orange: #ff9600;
  --violet: #7c4dff;
  --mint: #7fffd4;
  --danger: #ff6b6b;
  --radius: 8px;
  --page-pad: clamp(18px, 3vw, 48px);
  --content-max: 1520px;
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(11, 30, 34, 0.98), rgba(7, 16, 18, 1) 42%),
    radial-gradient(circle at 20% 10%, rgba(88, 204, 2, 0.16), transparent 28%),
    radial-gradient(circle at 82% 0%, rgba(28, 176, 246, 0.12), transparent 26%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--mint); }
img, svg { max-width: 100%; height: auto; }

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  background: var(--green);
  color: #08100b;
  padding: 10px 14px;
  z-index: 20;
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(7, 16, 18, 0.84);
  border-bottom: 1px solid var(--line);
}
.nav-shell {
  width: min(var(--content-max), calc(100% - var(--page-pad) * 2));
  margin: 0 auto;
  min-height: 82px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "brand main"
    "brand secondary";
  align-items: center;
  gap: 4px 28px;
  padding: 10px 0;
}
.brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 850;
  letter-spacing: 0;
  min-width: 136px;
}
.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  color: #04110d;
  box-shadow: 0 0 24px rgba(88, 204, 2, 0.35);
}
.main-nav, .secondary-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
}
.main-nav { grid-area: main; }
.secondary-links { grid-area: secondary; }
.main-nav a, .secondary-links a {
  color: var(--muted);
  font-size: 13px;
  padding: 6px 8px;
  border-radius: var(--radius);
}
.main-nav a:hover, .secondary-links a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.container {
  width: min(var(--content-max), calc(100% - var(--page-pad) * 2));
  margin: 0 auto;
}
.section {
  padding: clamp(52px, 6vw, 82px) 0;
}
.hero {
  min-height: 78vh;
  display: grid;
  align-items: center;
  padding: clamp(42px, 6vw, 74px) 0 44px;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}
.eyebrow {
  color: var(--mint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  font-weight: 800;
}
h1, h2, h3 {
  line-height: 1.12;
  letter-spacing: 0;
  margin: 0;
}
h1 { font-size: clamp(34px, 4.2vw, 56px); max-width: 1060px; }
h2 { font-size: clamp(26px, 3.1vw, 42px); }
h3 { font-size: 20px; }
p { margin: 0; }
.lead {
  color: #d6e5e2;
  font-size: clamp(16px, 1.45vw, 20px);
  max-width: 860px;
}
.muted { color: var(--muted); }
.stack { display: grid; gap: 18px; }
.tight { display: grid; gap: 10px; }
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 800;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, var(--green), #b7f95b);
  color: #07120b;
}
.btn-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}
.btn-ghost {
  border-color: transparent;
  color: var(--muted);
}

.device-stage {
  position: relative;
  min-height: 500px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    linear-gradient(120deg, rgba(88, 204, 2, 0.08), rgba(28, 176, 246, 0.08)),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.035) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(255,255,255,0.03) 0 1px, transparent 1px 46px);
  overflow: hidden;
}
.phone {
  width: min(340px, 84%);
  border: 10px solid #020708;
  border-radius: 34px;
  padding: 18px;
  background: linear-gradient(180deg, #f8fffb, #eaf4f1);
  color: #10201f;
  box-shadow: 0 26px 80px rgba(0,0,0,0.45);
}
.phone-top {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #435b59;
  margin-bottom: 20px;
}
.phone-path {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}
.lesson-node {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: 14px;
  background: white;
  border: 1px solid #d8e4e1;
}
.lesson-node strong { display: block; }
.node-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #58cc02;
  color: white;
  font-weight: 900;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.035));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2vw, 24px);
  min-height: 100%;
  display: grid;
  align-content: start;
  gap: 10px;
}
.card:hover {
  border-color: rgba(127, 255, 212, 0.45);
  transform: translateY(-1px);
  transition: 160ms ease;
}
.card-accent {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  margin-bottom: 14px;
  background: var(--accent, var(--green));
  display: grid;
  place-items: center;
  color: #04110d;
  font-weight: 900;
}
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}
.band {
  background: rgba(255,255,255,0.045);
  border-block: 1px solid var(--line);
}
.steps {
  counter-reset: step;
  display: grid;
  gap: 12px;
}
.step {
  counter-increment: step;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
}
.step::before {
  content: counter(step);
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--cyan);
  color: #041016;
  font-weight: 900;
}
.diagnostic {
  border: 1px solid rgba(127, 255, 212, 0.32);
  background: linear-gradient(135deg, rgba(28,176,246,0.12), rgba(88,204,2,0.09));
  padding: 22px;
  border-radius: var(--radius);
}
.option-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.choice {
  width: 100%;
  text-align: left;
  color: var(--text);
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--line);
  padding: 12px;
  border-radius: var(--radius);
  cursor: pointer;
}
.choice[aria-pressed="true"] {
  background: rgba(88, 204, 2, 0.2);
  border-color: var(--green);
}
.result-box, .form-status {
  border: 1px solid var(--line);
  padding: 14px;
  border-radius: var(--radius);
  background: rgba(0,0,0,0.18);
}
.lead-form {
  display: grid;
  gap: 12px;
}
label { display: grid; gap: 6px; color: var(--muted); font-size: 14px; }
input, textarea, select {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.22);
  color: var(--text);
  padding: 12px;
  font: inherit;
}
textarea { min-height: 110px; resize: vertical; }
.honeypot { position: absolute; left: -9999px; opacity: 0; }

.content-page {
  padding: 50px 0 80px;
}
.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 32px;
  align-items: start;
}
.article {
  background: rgba(255,255,255,0.045);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(20px, 4vw, 36px);
}
.article h1 { font-size: clamp(32px, 4vw, 54px); }
.article h2 { font-size: clamp(24px, 2.3vw, 32px); margin-top: 34px; }
.article ul, .article ol { padding-left: 22px; }
.article li { margin: 6px 0; }
.toc {
  position: sticky;
  top: 92px;
}
.notice {
  border-left: 4px solid var(--orange);
  padding: 12px 14px;
  background: rgba(255, 150, 0, 0.08);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: rgba(255,255,255,0.04);
  margin: 10px 0;
}
.faq-list summary { cursor: pointer; font-weight: 800; }

.site-footer {
  border-top: 1px solid var(--line);
  background: #050b0d;
  padding: 36px 0;
  color: var(--muted);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  gap: 20px;
}
.footer-grid a { display: block; padding: 4px 0; color: var(--muted); }
.sticky-cta {
  display: none;
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 20;
}

@media (max-width: 960px) {
  .nav-shell {
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
    gap: 12px;
  }
  .main-nav, .secondary-links { justify-content: flex-start; }
  .hero-grid, .article-shell { grid-template-columns: 1fr; }
  .device-stage { min-height: 420px; }
  .grid, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .toc { position: static; }
}
@media (max-width: 620px) {
  .main-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    max-width: 100%;
    padding-bottom: 4px;
    scrollbar-width: none;
  }
  .main-nav::-webkit-scrollbar { display: none; }
  .secondary-links { display: none; }
  .grid, .grid-4, .option-grid, .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 44px 0; }
  .hero { min-height: auto; padding-top: 34px; }
  h1 { font-size: clamp(32px, 9vw, 42px); }
  h2 { font-size: clamp(25px, 7vw, 34px); }
  h3 { font-size: 19px; }
  .lead { font-size: 16px; }
  .device-stage { min-height: 360px; }
  .phone { width: min(310px, 90%); }
  .cta-row .btn { width: 100%; }
  .sticky-cta { display: block; }
  body { padding-bottom: 76px; }
}

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