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

li {
  list-style: none;
}

a {
  text-decoration: none;
}

/* Variables */
:root {
  --color-white: #ffffff;
  --color-light: #e0e0e0;
  --color-gray: #888888;
  --color-purple: #6c63ff;
  --color-purple-hover: #554ec9;
  --color-dark: #2c2c2e;
  --color-black: #070707;

  --color-primary: var(--color-purple);
  --color-background: var(--color-light);
  --color-foreground: var(--color-black);
  --color-card-background: var(--color-white);
}

/* Base Styles */
html {
  font-size: 62.5%;
  scroll-behavior: smooth;
}

body {
  font-size: 1.6rem;
  line-height: 1.6;
  font-family: Arial, Helvetica, sans-serif;
  min-height: 100vh;
  background-color: var(--color-background);
  color: var(--color-foreground);
}

/* Hero Section */
.hero {
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.8)),
    url("../images/pexels-bertellifotografia-3321797.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  min-height: 100vh;
  color: var(--color-white);
  text-align: center;
  display: grid;
  place-content: center;
  padding: 1.5rem;
  width: 100%;
}

.hero h1 {
  font-size: 4rem;
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.btn {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 1rem 2rem;
  border-radius: 5px;
  font-size: 1.6rem;
  padding: 0.75rem 1.5rem;
  outline: none;
  cursor: pointer;
  border: none;
  transition: background-color 0.3s ease;
}

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

/* Speakers Section - Schedule Section */
.speakers,
.schedule {
  padding: 3rem 1.5rem;
}

.speakers h2,
.schedule h2 {
  font-size: 3.2rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.speakers-grid,
.schedule-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.speaker-card,
.schedule-item {
  background-color: var(--color-card-background);
  padding: 1.5rem;
  border-radius: 0.75rem;
  text-align: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.speaker-card img {
  width: 100%;
  height: auto;
  border-radius: 50%;
  margin-bottom: 1.5rem;
  max-width: 10rem;
}

.speaker-card h3,
.schedule-item h3 {
  font-size: 2.4rem;
  margin-bottom: 0.75rem;
}

.speaker-card p,
.schedule-item p {
  font-size: 1.8rem;
}

/* Newsletter Section */
.newsletter {
  padding: 3rem 1.5rem;
}
.newsletter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.newsletter-text {
  text-align: center;
}

.newsletter-text h2 {
  font-size: 3.2rem;
  margin-bottom: 1.5rem;
}
.newsletter-text p {
  color: var(--color-gray);
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
}
.form-group input {
  width: 100%;
  max-width: 32rem;
  background-color: var(--color-card-background);
  color: var(--color-foreground);
  border: 1px solid var(--color-gray);
  border-radius: 0.5rem;
  padding: 0.75rem;
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
}

.form-group input:focus {
  border-color: var(--color-primary);
  outline: none;
}

.newsletter-image {
  text-align: center;
}

.newsletter-image img {
  height: auto;
  max-width: 75%;
}

/* Footer Section */
.footer {
  text-align: center;
  padding: 1.5rem;
}

.footer p {
  margin-bottom: 1.5rem;
}

/* Media Queries */
@media screen and (min-width: 768px) {
  .hero h1 {
    font-size: 4.8rem;
  }

  .speakers-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .schedule-grid {
    grid-template-columns: repeat(2, 2fr);
  }

  .newsletter-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .newsletter-text {
    text-align: left;
  }
}

@media screen and (min-width: 1024px) {
  .hero,
  .speakers,
  .schedule,
  .newsletter {
    padding: 4rem 8rem;
  }
}

/* Color scheme */

@media screen and (prefers-color-scheme: dark) {
  :root {
    --color-background: var(--color-dark);
    --color-foreground: var(--color-white);
    --color-card-background: var(--color-black);
  }
}