* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  color: #111;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 0 20px;
}

/* HEADER */
.header {
  background: #fff;
  border-bottom: 1px solid #eee;
}

.header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 22px;
  font-weight: bold;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #111;
}

/* HERO */
.hero {
  background: #0f172a;
  color: white;
  padding: 100px 0;
}

.hero h1 {
  font-size: 42px;
}

.hero p {
  font-size: 18px;
}

.hero-buttons {
  margin-top: 30px;
}

/* BUTTONS */
.btn {
  background: #38bdf8;
  padding: 14px 26px;
  color: #000;
  text-decoration: none;
  border-radius: 6px;
  font-weight: bold;
}

.btn-outline {
  border: 2px solid white;
  padding: 12px 24px;
  margin-left: 15px;
  color: white;
  text-decoration: none;
  border-radius: 6px;
}

/* SECTION */
.section {
  padding: 80px 0;
}

.section h2 {
  margin-bottom: 40px;
}

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.card {
  border: 1px solid #ddd;
  padding: 25px;
  border-radius: 10px;
}

/* ABOUT */
.dark {
  background: #f8fafc;
}

.about-flex {
  display: flex;
  gap: 40px;
  align-items: center;
}

.about-flex img {
  width: 180px;
  border-radius: 50%;
}

/* VIDEO */
.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
}

.video-wrapper iframe {
  position: absolute;
  width: 100%;
  height: 100%;
}

/* SUBSCRIBE */
.subscribe input {
  padding: 12px;
  width: 260px;
}

.subscribe button {
  padding: 12px 20px;
  margin-left: 10px;
}

/* FOOTER */
.footer {
  background: #0f172a;
  color: white;
  text-align: center;
  padding: 30px;
}