* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Arial, sans-serif;
}

body {
  background: #ffffff;
  color: #111111;
}

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

.header {
  background: #ffffff;
  border-bottom: 1px solid #eeeeee;
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

.logo img {
  height: 40px;
}

.nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #111111;
  font-weight: 500;
}

.hero {
  padding: 80px 0;
  background: #f7f9fc;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 3rem;
}

.hero p {
  margin: 20px 0;
  color: #555555;
  line-height: 1.5;
}

.buttons .btn {
  display: inline-block;
  margin-right: 10px;
  padding: 12px 22px;
  text-decoration: none;
  border-radius: 6px;
}

.primary {
  background: #1DA1F2;
  color: white;
}

.secondary {
  border: 1px solid #1DA1F2;
  color: #1DA1F2;
}

.hero-visual .abstract-box {
  width: 100%;
  height: 280px;
  background: linear-gradient(135deg, #1DA1F2, #0B0E11);
  border-radius: 20px;
}

.services {
  padding: 70px 0;
}

.services h2 {
  text-align: center;
  margin-bottom: 40px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: #f5f5f5;
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  font-weight: 600;
}

.about {
  padding: 70px 0;
  background: #f9fafc;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.about-list p {
  margin-bottom: 10px;
  font-weight: 500;
}

.contact {
  padding: 70px 0;
}

.contact form {
  max-width: 500px;
  margin: auto;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.contact input,
.contact textarea {
  padding: 12px;
  border-radius: 6px;
  border: 1px solid #dddddd;
}

.contact button {
  padding: 14px;
  background: #0B0E11;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
}

.footer {
  background: #0B0E11;
  color: white;
  padding: 40px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.footer a {
  color: #cccccc;
  text-decoration: none;
}