* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f5f7fb;
  background:
    radial-gradient(circle at top left, rgba(25, 227, 255, 0.14), transparent 28%),
    radial-gradient(circle at bottom right, rgba(123, 97, 255, 0.14), transparent 28%),
    #090b14;
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(9, 11, 20, 0.84);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  height: 68px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-weight: 900;
  letter-spacing: 0.04em;
}

.site-logo span {
  background: linear-gradient(135deg, #19e3ff, #7b61ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.header-nav {
  display: flex;
  gap: 8px;
}

.header-link {
  padding: 10px 14px;
  border-radius: 999px;
  color: #cfd6e6;
  font-size: 14px;
}

.header-link:hover {
  background: rgba(255, 255, 255, 0.08);
}

/* Hero */

.hero {
  padding: 72px 0 48px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  margin: 0 0 16px;
  padding: 8px 14px;
  border-radius: 999px;
  color: #19e3ff;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  background: rgba(25, 227, 255, 0.08);
  border: 1px solid rgba(25, 227, 255, 0.24);
}

.hero h1 {
  margin: 0 0 22px;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.hero-text {
  max-width: 620px;
  color: #cfd6e6;
  font-size: 17px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  transition: 0.2s ease;
}

.primary-btn {
  color: #fff;
  background: linear-gradient(135deg, #19e3ff, #7b61ff);
  box-shadow: 0 18px 40px rgba(25, 227, 255, 0.18);
}

.secondary-btn {
  color: #dbe3f3;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.primary-btn:hover,
.secondary-btn:hover {
  transform: translateY(-2px);
}

/* Hero Card */

.hero-card {
  padding: 28px;
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.hero-card-label {
  margin: 0 0 12px;
  color: #19e3ff;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero-card h2 {
  margin: 0 0 22px;
  font-size: 26px;
}

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

.hero-check-list li {
  position: relative;
  padding: 14px 0 14px 30px;
  color: #e8edf7;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-check-list li:last-child {
  border-bottom: none;
}

.hero-check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #19e3ff;
  font-weight: 900;
}

/* Section */

.section {
  padding: 10px 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-label {
  margin: 0 0 10px;
  color: #19e3ff;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.section-heading h2 {
  margin: 0 0 14px;
  font-size: 34px;
  letter-spacing: -0.03em;
}

.section-heading p {
  margin: 0;
  color: #cfd6e6;
  line-height: 1.8;
}

/* Guide Cards */

.beginner-section {
  padding-top: 40px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.guide-card {
  padding: 24px;
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.guide-card h3 {
  margin: 0 0 12px;
  font-size: 21px;
}

.guide-card p {
  margin: 0;
  color: #cfd6e6;
  line-height: 1.75;
}

/* Footer */

.site-footer {
  padding: 34px 0;
  color: #9aa7bd;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* Mobile */

@media (max-width: 900px) {
  .hero-inner,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 56px 0;
  }

  .hero h1 {
    font-size: clamp(38px, 12vw, 54px);
  }

  .hero-actions {
    flex-direction: column;
  }

  .primary-btn,
  .secondary-btn {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(100% - 24px, 1120px);
  }

  .header-inner {
    height: 60px;
  }

  .site-logo {
    font-size: 15px;
  }

  .header-nav {
    gap: 4px;
  }

  .header-link {
    padding: 8px 9px;
    font-size: 12px;
  }

  .hero-card,
  .guide-card {
    padding: 20px;
    border-radius: 22px;
  }

  .section {
    padding: 56px 0;
  }

  .section-heading h2 {
    font-size: 28px;
  }
}