:root {
  --bg: #ffffff;
  --bg-dark: #0a0a0a;
  --text: #1a1a1a;
  --text-muted: #666666;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #059669;
  --error: #dc2626;
  --card: #ffffff;
  --border: rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Hero Section - Full-screen with background image */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  background-image: url('https://images.unsplash.com/photo-1549298916-b41d501d3772?w=1600&q=80');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  isolation: isolate;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.9) 0%, rgba(29, 78, 216, 0.85) 100%);
  z-index: -1;
}

.hero__content {
  max-width: 720px;
  text-align: center;
  color: white;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero__eyebrow {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  line-height: 1.5;
  margin-bottom: 2.5rem;
  opacity: 0.95;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Email Capture Form */
.hero__form {
  max-width: 500px;
  margin: 0 auto 1.5rem;
}

.form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.form__input {
  flex: 1 1 250px;
  min-width: 0;
  padding: 1rem 1.25rem;
  font-size: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.95);
  color: var(--text);
  font-family: var(--font-sans);
  transition: all 0.2s ease;
}

.form__input:focus {
  outline: none;
  border-color: white;
  background: white;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.2);
}

.form__input::placeholder {
  color: var(--text-muted);
}

.form__input.error {
  border-color: var(--error);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

.form__button {
  flex: 0 0 auto;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  background: white;
  color: var(--accent);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
  white-space: nowrap;
}

.form__button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.form__button:active {
  transform: translateY(0);
}

.form__button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form__button.loading::after {
  content: '';
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-left: 8px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.form__message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  text-align: center;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.form__message.success {
  background: rgba(255, 255, 255, 0.95);
  color: var(--success);
  border: 2px solid var(--success);
}

.form__message.error {
  background: rgba(255, 255, 255, 0.95);
  color: var(--error);
  border: 2px solid var(--error);
}

.hero__note {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Features Section */
.features {
  padding: 5rem 1.5rem;
  background: var(--bg);
}

.features__container {
  max-width: 1200px;
  margin: 0 auto;
}

.features__header {
  text-align: center;
  margin-bottom: 4rem;
}

.features__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.features__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 2rem;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.75rem;
}

.feature-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature-card__description {
  color: var(--text-muted);
  line-height: 1.6;
}

/* Social Proof Section */
.social-proof {
  padding: 5rem 1.5rem;
  background: linear-gradient(180deg, var(--bg) 0%, #f9fafb 100%);
}

.social-proof__container {
  max-width: 1200px;
  margin: 0 auto;
}

.social-proof__header {
  text-align: center;
  margin-bottom: 3rem;
}

.social-proof__title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.social-proof__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.stat-card {
  text-align: center;
  padding: 2rem 1rem;
}

.stat-card__number {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-card__label {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}

.social-proof__testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.testimonial {
  padding: 2rem;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.testimonial__quote {
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  font-style: italic;
}

.testimonial__author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.testimonial__avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 1.125rem;
}

.testimonial__info {
  flex: 1;
}

.testimonial__name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.testimonial__title {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Footer */
.footer {
  padding: 3rem 1.5rem 2rem;
  background: var(--bg-dark);
  color: white;
}

.footer__container {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer__brand {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer__tagline {
  font-size: 1rem;
  opacity: 0.7;
  margin-bottom: 2rem;
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.footer__link {
  color: white;
  opacity: 0.8;
  text-decoration: none;
  transition: opacity 0.2s ease;
  font-size: 0.9375rem;
}

.footer__link:hover {
  opacity: 1;
}

.footer__divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 2rem 0;
}

.footer__bottom {
  font-size: 0.875rem;
  opacity: 0.6;
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .form {
    flex-direction: column;
  }

  .form__input,
  .form__button {
    width: 100%;
  }

  .hero {
    min-height: 100svh;
    padding: 1.5rem 1rem;
  }

  .features,
  .social-proof {
    padding: 3rem 1rem;
  }
}

/* Focus visible styles for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}