:root {
  --color-background: #040813;
  --color-surface: rgba(10, 14, 35, 0.85);
  --color-surface-strong: rgba(13, 18, 41, 0.95);
  --color-overlay: rgba(135, 108, 209, 0.25);
  --color-primary: #4054B2;
  --color-accent: #876CD1;
  --color-highlight: #6EC1E4;
  --color-success: #23A455;
  --color-error: #FF606E;
  --color-warning: #FFC253;
  --color-text: #FCFCFC;
  --color-muted: #ABB8C3;
  --shadow-large: 0 40px 80px rgba(3, 8, 29, 0.46);
  --shadow-card: 0 24px 48px rgba(5, 8, 23, 0.48);
  --radius-large: 24px;
  --radius-medium: 18px;
  --transition: 200ms ease;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Poppins', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: radial-gradient(circle at top left, rgba(64, 84, 178, 0.22), transparent 45%),
    radial-gradient(circle at 20% 80%, rgba(135, 108, 209, 0.18), transparent 50%),
    linear-gradient(160deg, #050a1e 0%, #020612 100%);
  min-height: 100vh;
}

a {
  color: var(--color-highlight);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover,
a:focus {
  color: var(--color-primary);
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 10;
  background: rgba(4, 6, 18, 0.85);
  backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid rgba(135, 108, 209, 0.25);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.2rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 1.1rem;
}

.brand__logo {
  width: clamp(72px, 8vw, 140px);
  height: auto;
  filter: drop-shadow(0 14px 20px rgba(4, 10, 35, 0.6));
}


.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.75;
}

.site-nav a:hover,
.site-nav a:focus {
  opacity: 1;
  color: var(--color-highlight);
}

.hero {
  padding: clamp(4rem, 8vw, 7rem) 0;
  background: linear-gradient(135deg, rgba(64, 84, 178, 0.78) 0%, rgba(135, 108, 209, 0.7) 45%, rgba(5, 10, 30, 0.95) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(110, 193, 228, 0.2), transparent 55%);
  pointer-events: none;
}

.hero__grid {
  position: relative;
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
}

.hero__text h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.2rem, 4vw, 3rem);
  line-height: 1.15;
  font-weight: 600;
}

.hero__text p {
  margin: 0 0 1.5rem;
  color: rgba(255, 255, 255, 0.92);
}

.hero__benefits {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.hero__benefits li {
  position: relative;
  padding-left: 1.75rem;
  font-weight: 500;
}

.hero__benefits li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-highlight), var(--color-accent));
  box-shadow: 0 0 12px rgba(135, 108, 209, 0.55);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: var(--shadow-card);
}

.hero__cta:hover,
.hero__cta:focus {
  transform: translateY(-2px);
  color: #ffffff;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.68);
  margin-bottom: 1rem;
}

.eyebrow--card {
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.5rem;
}

.validation-card {
  position: relative;
  background: linear-gradient(160deg, rgba(12, 18, 48, 0.9), rgba(18, 24, 58, 0.8));
  border-radius: var(--radius-large);
  padding: clamp(1.8rem, 4vw, 2.8rem);
  border: 1px solid rgba(135, 108, 209, 0.35);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  backdrop-filter: blur(18px) saturate(130%);
}

.validation-card::before {
  content: '';
  position: absolute;
  top: -45%;
  left: -30%;
  width: 170%;
  height: 170%;
  background: radial-gradient(circle at 25% 20%, rgba(135, 108, 209, 0.35), rgba(135, 108, 209, 0) 70%);
  opacity: 0.8;
  pointer-events: none;
}

.validation-card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.6rem;
}

.input-label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.65rem;
}

.input-group {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.input-group input {
  flex: 1;
  padding: 0.95rem 1.15rem;
  border-radius: var(--radius-medium);
  border: 1px solid rgba(110, 193, 228, 0.55);
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-text);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  box-shadow: 0 20px 36px rgba(5, 12, 40, 0.45);
  transition: border var(--transition), box-shadow var(--transition), background var(--transition);
}

.input-group input:hover {
  border-color: rgba(110, 193, 228, 0.8);
  background: rgba(255, 255, 255, 0.16);
}

.input-group input:focus {
  outline: none;
  border-color: rgba(110, 193, 228, 0.95);
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 0 3px rgba(110, 193, 228, 0.25), 0 24px 44px rgba(4, 14, 40, 0.55);
}

.input-group input::placeholder {
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.02em;
}

.input-group button {
  padding: 0.9rem 1.6rem;
  border: none;
  border-radius: var(--radius-medium);
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #ffffff;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-card);
}

.input-group button:hover,
.input-group button:focus {
  transform: translateY(-2px);
  box-shadow: 0 18px 30px rgba(10, 12, 35, 0.55);
}

.input-hint {
  margin: 0.9rem 0 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.feedback {
  margin: 1.6rem 0 0;
  font-weight: 600;
  color: var(--color-warning);
  transition: color var(--transition);
}

.feedback--success {
  color: var(--color-success);
}

.feedback--error {
  color: var(--color-error);
}

dl.details {
  margin: 2rem 0 0;
  display: grid;
  gap: 1.15rem;
}

.details__row {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.9rem 1rem;
  border-radius: 14px;
  background: rgba(8, 12, 32, 0.65);
  border: 1px solid rgba(135, 108, 209, 0.25);
}

.details__row dt {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

.details__row dd {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: #ffffff;
}

.section {
  padding: clamp(3.5rem, 7vw, 5.5rem) 0;
  background: rgba(5, 8, 24, 0.82);
}

.section--alt {
  background: rgba(6, 10, 28, 0.92);
}

.section__inner {
  display: grid;
  gap: 2.75rem;
}

.section__header h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
}

.section__header p {
  margin: 0;
  color: rgba(255, 255, 255, 0.82);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.8rem;
}

.feature-card {
  position: relative;
  background: var(--color-surface-strong);
  padding: 1.75rem;
  border-radius: 20px;
  border: 1px solid rgba(135, 108, 209, 0.2);
  box-shadow: 0 24px 40px rgba(2, 5, 18, 0.45);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: -45%;
  right: -30%;
  width: 160%;
  height: 160%;
  background: radial-gradient(circle at 70% 15%, rgba(110, 193, 228, 0.24), rgba(110, 193, 228, 0) 70%);
  opacity: 0.75;
  pointer-events: none;
}

.feature-card h3 {
  margin: 0 0 0.9rem;
  font-size: 1.25rem;
}

.feature-card p {
  margin: 0;
  color: rgba(255, 255, 255, 0.8);
}

.faq {
  display: grid;
  gap: 1.2rem;
}

.faq details {
  background: rgba(8, 12, 30, 0.75);
  border-radius: 16px;
  border: 1px solid rgba(135, 108, 209, 0.25);
  padding: 1rem 1.25rem;
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.32);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
}

.faq summary::after {
  content: '+';
  position: absolute;
  right: 0.5rem;
  top: 0.2rem;
  font-size: 1.5rem;
  transition: transform var(--transition);
}

.faq details[open] summary::after {
  transform: rotate(45deg);
}

.faq p {
  margin: 0.75rem 0 0;
  color: rgba(255, 255, 255, 0.78);
}

.site-footer {
  background: rgba(4, 6, 18, 0.9);
  padding: 2rem 0;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .site-nav {
    gap: 1rem;
  }
}

@media (max-width: 720px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .brand {
    width: 100%;
  }

  .input-group {
    flex-direction: column;
    align-items: stretch;
  }

  .input-group button {
    width: 100%;
  }

  .hero__cta {
    justify-content: center;
  }
}

@media (max-width: 500px) {
  .hero__text h1 {
    font-size: 2rem;
  }

  .feature-card {
    padding: 1.4rem;
  }

  .brand__logo {
    width: clamp(64px, 9vw, 120px);
  }
}