/* ProofBase Online – Style.css */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

:root {
  --bg-color: #0B0C10;
  --text-color: #E8E8E8;
  --accent-color: #00BCD4;
  --secondary-bg: #1F2833;
  --hover-color: #45A29E;
  --head-bg: #000000;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(0,255,255,0.04), transparent 70%);
  pointer-events: none;
}
body {
background: linear-gradient(135deg, #000000 0%, #000000 40%, #1a1e25 100%);
  background-attachment: fixed;
  color: #e0e0e0;
  font-family: 'IBM Plex Sans', sans-serif;
  margin: 0;
  padding: 0;
}

header {
  position: relative; 
  background: var(--head-bg);
  padding: 1rem 0;
  
}
header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px; /* Höhe des Streifens */
  background: linear-gradient(
    90deg,
    rgba(0, 255, 255, 0.3) 0%,
    rgba(0, 255, 255, 0.8) 50%,
    rgba(0, 255, 255, 0.3) 100%
  );
  box-shadow: 0 0 12px rgba(0, 255, 255, 0.4);
}
header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-color);
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  margin-left: 0.5rem;
}

nav a:hover {
  color: var(--accent-color);
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

.hero {
  text-align: center;
  padding: 5rem 1rem 3rem;
  background: linear-gradient(180deg, var(--secondary-bg) 0%, var(--bg-color) 100%);
}

.hero h1 {
  color: var(--accent-color);
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.1rem;
  max-width: 750px;
  margin: 0 auto 2rem;
}

.hero-graphic img {
  width: 80%;
  max-width: 600px;
  opacity: 0.9;
  border-radius: 10px;
}

section {
  padding: 4rem 1rem;
}

section h2 {
  color: var(--accent-color);
  text-align: center;
  margin-bottom: 2rem;
}

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

.card {
  background: var(--secondary-bg);
  padding: 2rem;
  border-radius: 8px;
  transition: background 0.3s ease;
}

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

.card h3 {
  color: var(--accent-color);
}

.split {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2rem;
}

.split .text {
  flex: 1 1 50%;
}

.split .image {
  flex: 1 1 50%;
  text-align: center;
}

.split img {
  width: 90%;
  max-width: 500px;
  border-radius: 10px;
}

ul li {
  margin-bottom: 0.5rem;
}

.graphic-placeholder {
  text-align: center;
  margin-top: 2rem;
}

.graphic-placeholder img {
  width: 80%;
  max-width: 600px;
}

footer {
  background: var(--secondary-bg);
  text-align: center;
  padding: 1rem 0;
  font-size: 0.9rem;
}

footer a {
  color: var(--accent-color);
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  .split {
    flex-direction: column;
  }
}