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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f8fafc;
  color: #111827;
}

button,
a {
  font-family: inherit;
}

.app {
  width: 100%;
  overflow-x: hidden;
}

/* Navbar */
.navbar {
  height: 75px;
  padding: 0 8%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 25px;
  font-weight: 800;
  color: #111827;
}

.logo span {
  color: #2563eb;
}

.nav-links {
  display: flex;
  gap: 35px;
}

.nav-links a {
  text-decoration: none;
  color: #374151;
  font-size: 15px;
  font-weight: 600;
  transition: 0.2s;
}

.nav-links a:hover {
  color: #2563eb;
}

.menu-btn {
  border: 0;
  padding: 11px 22px;
  background: #2563eb;
  color: #fff;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.menu-btn:hover {
  background: #1d4ed8;
}

/* Hero */
.hero {
  min-height: 600px;
  display: flex;
  align-items: center;
  padding: 80px 8%;
  background: linear-gradient(135deg, #eff6ff, #fff 50%, #eef2ff);
}

.hero-content {
  max-width: 750px;
}

.small-title {
  color: #2563eb;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 64px;
  line-height: 1.1;
  color: #111827;
  margin-bottom: 25px;
}

.hero h1 span {
  color: #2563eb;
}

.hero-text {
  max-width: 600px;
  color: #6b7280;
  font-size: 18px;
  line-height: 1.7;
  margin-bottom: 35px;
}

.hero-buttons {
  display: flex;
  gap: 15px;
}

.primary-btn,
.secondary-btn {
  padding: 14px 25px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: 0.2s;
}

.primary-btn {
  border: 0;
  background: #2563eb;
  color: #fff;
}

.primary-btn:hover {
  background: #1d4ed8;
}

.secondary-btn {
  border: 1px solid #2563eb;
  background: #fff;
  color: #2563eb;
}

.secondary-btn:hover {
  background: #eff6ff;
}

/* Section Heading */
.section-heading {
  text-align: center;
  margin-bottom: 50px;
}

.section-heading p {
  color: #2563eb;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.section-heading h2 {
  font-size: 40px;
  color: #111827;
  margin-bottom: 12px;
}

.section-heading span {
  color: #6b7280;
}

/* Skills */
.skills-section {
  padding: 90px 8%;
  background: #fff;
}

.skill-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}

.skill-card {
  padding: 30px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 15px;
  transition: 0.3s;
}

.skill-card:hover {
  transform: translateY(-7px);
  border-color: #2563eb;
  box-shadow: 0 15px 35px rgba(37, 99, 235, 0.1);
}

.icon {
  width: 55px;
  height: 55px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #dbeafe;
  border-radius: 12px;
  font-size: 26px;
  margin-bottom: 20px;
}

.skill-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.skill-card p {
  color: #6b7280;
  line-height: 1.6;
  margin-bottom: 20px;
}

.skill-card button {
  border: 0;
  background: transparent;
  color: #2563eb;
  font-weight: 700;
  cursor: pointer;
}

/* Courses */
.courses-section {
  padding: 90px 8%;
  background: #f8fafc;
}

.course-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.course-card {
  overflow: hidden;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 15px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.04);
  transition: 0.3s;
}

.course-card:hover {
  transform: translateY(-5px);
}

.course-image {
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 30px;
  font-weight: 800;
}

.blue {
  background: linear-gradient(135deg, #2563eb, #60a5fa);
}

.purple {
  background: linear-gradient(135deg, #7c3aed, #c084fc);
}

.green {
  background: linear-gradient(135deg, #059669, #34d399);
}

.course-content {
  padding: 25px;
}

.course-content span {
  color: #2563eb;
  font-size: 13px;
  font-weight: 700;
}

.course-content h3 {
  font-size: 21px;
  margin: 10px 0;
}

.course-content p {
  color: #6b7280;
  line-height: 1.6;
  margin-bottom: 20px;
}

.course-btn {
  width: 100%;
  padding: 12px;
  border: 0;
  border-radius: 8px;
  background: #111827;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.course-btn:hover {
  background: #2563eb;
}

/* About */
.about-section {
  padding: 100px 8%;
  background: #111827;
  color: #fff;
}

.about-content {
  max-width: 700px;
}

.about-content h2 {
  font-size: 45px;
  line-height: 1.2;
  margin-bottom: 25px;
}

.about-content h2 span {
  color: #60a5fa;
}

.about-content > p:not(.small-title) {
  color: #d1d5db;
  line-height: 1.8;
  font-size: 17px;
  margin-bottom: 30px;
}

/* Footer */
.footer {
  padding: 30px 8%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #030712;
  color: #9ca3af;
}

.footer-logo {
  color: #fff;
  font-size: 20px;
  font-weight: 800;
}

.footer-logo span {
  color: #3b82f6;
}

.footer p {
  font-size: 14px;
}

/* Responsive */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }

  .hero h1 {
    font-size: 48px;
  }

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

  .course-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .navbar {
    padding: 0 5%;
  }

  .hero {
    padding: 60px 5%;
  }

  .hero h1 {
    font-size: 40px;
  }

  .hero-text {
    font-size: 16px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .skills-section,
  .courses-section,
  .about-section {
    padding: 65px 5%;
  }

  .skill-container {
    grid-template-columns: 1fr;
  }

  .section-heading h2 {
    font-size: 32px;
  }

  .about-content h2 {
    font-size: 35px;
  }

  .footer {
    padding: 25px 5%;
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }
}