:root {
  --color-bg: #0a0e1a;
  --color-surface: #111827;
  --color-surface-alt: #1a2233;
  --color-border: #1e293b;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-subtle: rgba(59, 130, 246, 0.1);
  --color-success: #22c55e;
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1120px;
  --radius: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-system);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

nav {
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(12px);
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav .logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-text);
  text-decoration: none;
}

.nav-toggle-input { display: none; }
.nav-toggle-label { display: none; }

nav .nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

nav .nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.hero {
  padding: 100px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, rgba(59,130,246,0.04) 0%, transparent 60%);
}

.hero h1 {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero .tagline {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.btn-group {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover { background: var(--color-accent-hover); }

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
}

section {
  padding: 80px 0;
  border-top: 1px solid var(--color-border);
}

section h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

section .section-sub {
  color: var(--color-text-muted);
  font-size: 16px;
  margin-bottom: 40px;
  max-width: 640px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}

.card-grid.cols-2 {
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}

.card:hover { border-color: var(--color-accent); }

.card-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.card ul {
  list-style: none;
  padding: 0;
  margin: 12px 0;
}

.card ul li {
  font-size: 14px;
  color: var(--color-text-muted);
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}

.card ul li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.card .btn { margin-top: 16px; display: inline-block; }

.engagement-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.engagement-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.engagement-block h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.engagement-block p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.inv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.inv-item {
  font-size: 14px;
  color: var(--color-text-muted);
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.inv-code {
  color: var(--color-accent);
  font-weight: 700;
  font-size: 12px;
  margin-right: 8px;
  letter-spacing: 0.5px;
}

.inv-note {
  margin-top: 24px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.inv-note a {
  color: var(--color-accent);
  text-decoration: none;
}

.inv-note a:hover { text-decoration: underline; }

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.trust-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.trust-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
}

.trust-value {
  font-size: 15px;
  color: var(--color-text);
}

.trust-value a {
  color: var(--color-accent);
  text-decoration: none;
}

.trust-value a:hover { text-decoration: underline; }

.form-container {
  max-width: 720px;
}

.engagement-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  letter-spacing: 0.3px;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text);
  font-family: var(--font-system);
  transition: border-color 0.2s;
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2394a3b8' d='M1.41 0L6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.form-group select option {
  background: var(--color-surface);
  color: var(--color-text);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.btn-submit {
  align-self: flex-start;
  padding: 14px 36px;
  font-size: 15px;
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-confirmation {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 48px 32px;
  text-align: center;
}

.confirmation-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.1);
  border: 2px solid var(--color-success);
  color: var(--color-success);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.form-confirmation h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.form-confirmation p {
  color: var(--color-text-muted);
  font-size: 15px;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

.confirmation-contact {
  margin-top: 16px;
}

.confirmation-contact a {
  color: var(--color-accent);
  text-decoration: none;
}

footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  text-align: center;
}

.footer-entity {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-legal {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 12px;
}

.footer-legal a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 13px;
}

.footer-legal a:hover { color: var(--color-text); }

.footer-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  opacity: 0.7;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 28px; letter-spacing: -0.5px; }
  .hero .tagline { font-size: 16px; }
  .hero { padding: 60px 0 50px; }
  section { padding: 60px 0; }
  section h2 { font-size: 24px; }
  .card-grid { grid-template-columns: 1fr; }
  .card-grid.cols-2 { grid-template-columns: 1fr; }
  .engagement-grid { grid-template-columns: 1fr; }
  .inv-grid { grid-template-columns: 1fr; }
  .trust-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }

  .nav-toggle-label {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    z-index: 200;
  }

  .nav-toggle-label span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s;
  }

  nav .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    gap: 0;
  }

  nav .nav-links li {
    border-bottom: 1px solid var(--color-border);
  }

  nav .nav-links li:last-child {
    border-bottom: none;
  }

  nav .nav-links a {
    display: block;
    padding: 12px 0;
    font-size: 15px;
  }

  .nav-toggle-input:checked ~ .nav-links {
    display: flex;
  }

  .btn-group {
    flex-direction: column;
    align-items: center;
  }

  .btn-group .btn {
    width: 100%;
    max-width: 320px;
    text-align: center;
  }

  .btn-submit {
    width: 100%;
  }
}