:root {
  --bg: #0b1220;
  --panel: #121d31;
  --text: #e8f1ff;
  --muted: #a6b7d4;
  --cyan: #44d5ff;
  --blue: #2f7dff;
  --green: #4be28a;
  --line: #223451;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(circle at top, #13233f 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.5;
}

a {
  color: var(--cyan);
}

.container {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--line);
  background: rgba(8, 14, 24, 0.78);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
}

.brand {
  display: flex;
  gap: 10px;
  align-items: center;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 16px;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
}

.nav-links a:hover {
  color: var(--text);
}

.hero {
  padding: 56px 0 42px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
  align-items: center;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.1;
}

.hero p {
  color: var(--muted);
  margin: 0 0 22px;
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid var(--line);
  background: #1b2942;
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
}

.btn.primary {
  background: linear-gradient(135deg, var(--blue), #35b7ff);
  border: none;
}

.hero-card {
  background: linear-gradient(180deg, #122038, #0c1729);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

.hero-card img {
  width: 100%;
  max-width: 280px;
  display: block;
  margin: 0 auto 12px;
  border-radius: 24px;
}

.section {
  margin: 24px 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(14, 23, 37, 0.88);
}

.section h2 {
  margin: 0 0 10px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.feature {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

.feature h3 {
  margin: 0 0 6px;
  color: var(--cyan);
}

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

footer {
  margin-top: 38px;
  padding: 24px 0 34px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

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

.help-section h3 {
  margin: 0 0 8px;
  color: var(--green);
}

.help-list {
  margin: 0;
  padding-left: 20px;
}

.help-list li {
  margin: 6px 0;
  color: var(--muted);
}

@media (max-width: 840px) {
  .hero {
    grid-template-columns: 1fr;
  }
}