/* Reset & Global Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background-color: #0e0e0e;
  color: #f1f1f1;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #ffffff;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.2rem);
  margin-bottom: 20px;
}

h2 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  margin-bottom: 36px;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
  color: #008AF3;
  letter-spacing: 0.02em;
}

p {
  font-size: 1.125rem;
  color: #d1d1d1;
  margin-bottom: 20px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.65;
}

/* Links */
a {
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.3s ease;
}

a:hover,
a:focus {
  color: #00bfff;
  outline: none;
}

/* Hero Section */
.hero {
  background: radial-gradient(ellipse at center, #1b1b1b 0%, #000 100%);
  text-align: center;
  padding: 100px 20px 80px;
  max-width: 1000px;
  margin: 0 auto 100px;
  box-shadow: inset 0 0 80px #00a6ff33;
  border-radius: 14px;
}

.logo {
  display: block;                        /* Makes margin: auto work */
  margin: 0 auto 35px;                   /* Centers image */
  max-width: 440px;
  width: 100%;                           /* Makes it responsive */
  height: auto;
  filter: drop-shadow(0 2px 3px rgba(0, 166, 255, 0.5));
}

.subtitle {
  font-size: 1.25rem;
  max-width: 720px;
  margin: 0 auto 36px;
  color: #a3a3a3;
  font-weight: 500;
  line-height: 1.5;
}

/* CTA Inline */
.cta-inline {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
}

.cta-caption {
  font-size: 1rem;
  color: #999999;
  font-style: italic;
  font-weight: 500;
  opacity: 0.75;
  max-width: 320px;
  text-align: center;
}

/* Buttons */
.cta-button {
  background: linear-gradient(135deg, #00d4ff, #008af3);
  color: #000000;
  padding: 16px 36px;
  font-weight: 700;
  border-radius: 10px;
  font-size: 1.1rem;
  box-shadow: 0 6px 20px rgba(0, 138, 243, 0.3);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: none;
  cursor: pointer;
  user-select: none;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cta-button:hover,
.cta-button:focus-visible {
  background: linear-gradient(135deg, #00f9c0, #00b5ff);
  box-shadow: 0 8px 24px rgba(0, 195, 255, 0.6);
  transform: translateY(-3px);
  outline-offset: 4px;
}

/* Section backgrounds and spacing */
.intro,
.urgency,
.features {
  padding: 80px 24px;
  max-width: 1000px;
  margin: 0 auto 100px auto;
  border-radius: 14px;
  background: #121212;
  box-shadow: 0 4px 24px rgba(0, 166, 255, 0.12);
}

/* What is Eprion - intro paragraph */
.intro {
  background: #121212;
  box-shadow: 0 4px 24px rgba(0, 166, 255, 0.15);
  border-radius: 14px;
  padding: 64px 48px;
  max-width: 960px;
  margin: 0 auto 100px;
  color: #d1d1d1;
  font-size: 1.125rem;
  line-height: 1.65;
  text-align: center;
}

.intro h2 {
  font-size: 2.6rem;
  color: #008AF3;
  text-shadow: 0 0 10px #00aaffaa;
  margin-bottom: 36px;
}

.intro p {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 500;
}


/* Why It Matters Now - two-column layout */
.urgency {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  color: #ccc;
}

.urgency > p {
  flex: 1 1 380px;
  max-width: 440px;
  font-size: 1.15rem;
  line-height: 1.6;
  margin-top: 4px;
  color: #bbbbbb;
}

/* List styled as second column */
.urgency ul {
  flex: 2 1 480px;
  padding-left: 2rem;
  list-style: none;
  margin-top: 0;
}

.urgency ul li {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 28px;
  font-weight: 600;
  color: #ddd;
  font-size: 1rem;
  line-height: 1.4;
  border-left: 3px solid #00a6ff;
  transition: background-color 0.3s ease;
  border-radius: 6px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.urgency ul li:hover {
  background-color: rgba(0, 166, 255, 0.1);
}

.urgency ul li strong {
  display: block;
  margin-bottom: 6px;
  font-weight: 700;
  color: #00b0ff;
  font-size: 1.1rem;
}

/* Core Capabilities Section */
.features {
  background: #0f1215;
  box-shadow: 0 0 40px #007acc44 inset;
  padding: 80px 24px 100px;
}

.features h2 {
  margin-bottom: 48px;
  font-size: 2.6rem;
  color: #008AF3;
  text-shadow: 0 0 12px #00aaff99;
  text-align: center;
}

/* Feature Grid */
.features .feature-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    margin-top: 2rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
}

/* Individual Feature Cards */
.feature {
  background: #181c20;
  border: none;
  box-shadow: 0 4px 16px rgba(0, 166, 255, 0.25);
  padding: 1.5rem;
  border-radius: 16px;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  cursor: default;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature:hover,
.feature:focus-within {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 166, 255, 0.5);
}

.feature h3 {
  color: #008AF3;
  font-size: 1.5rem;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.feature p {
  font-weight: 500;
  font-size: 1.1rem;
  color: #ccc;
  line-height: 1.5;
  flex-grow: 1;
}

/* Placeholder icon styles (uncomment if icons added) */
.feature img {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 3px #00a6ff77);
}

/* Responsive */
@media (max-width: 900px) {
  .urgency {
    flex-direction: column;
  }
  
  .urgency > p,
  .urgency ul {
    max-width: 100%;
  }

  .feature-grid {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2.1rem;
  }

  section h2 {
    font-size: 1.8rem;
  }

  .feature {
    padding: 20px 24px;
  }

  .cta-button {
    padding: 14px 28px;
    font-size: 1rem;
  }
}

/* Footer */
footer {
  text-align: center;
  padding: 32px 20px;
  font-size: 0.9rem;
  opacity: 0.6;
  border-top: 1px solid #2a2a2a;
  margin-top: 40px;
  user-select: none;
}

.cta {
  background-color: #121212;
  padding: 80px 24px;
  margin: 100px auto;
  max-width: 1000px;
  border-radius: 12px;
  text-align: center;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cta h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: #008AF3;
}

.cta p {
  font-size: 1.1rem;
  max-width: 1000px;
  margin-bottom: 30px;
  color: #cccccc;
  line-height: 1.5;
}

.cta .cta-button {
  background-color: #00bfff;
  color: black;
  padding: 12px 28px;
  font-weight: bold;
  border-radius: 8px;
  font-size: 1rem;
  border: none;
  text-transform: uppercase;
  transition: all 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}

.cta .cta-button:hover {
  background-color: #00f0ff;
  transform: translateY(-2px);
}