/* ===== CSS Variables ===== */
:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --bg-light: #f9fafb;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --accent-color: #10b981;
  --transition: all 0.3s ease;
}

/* ===== Reset & Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

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

/* ===== Navigation ===== */
.navbar {
  background-color: var(--bg-white);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-dark);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-menu a {
  color: var(--text-dark);
  font-weight: 500;
  padding: 0.5rem 0;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-menu a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--text-dark);
  transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  text-align: center;
  padding: 8rem 0;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.tagline {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 0.875rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  display: inline-block;
}

.btn-primary {
  background-color: white;
  color: var(--primary-color);
}

.btn-primary:hover {
  background-color: var(--bg-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  background-color: transparent;
  color: white;
  border: 2px solid white;
}

.btn-secondary:hover {
  background-color: white;
  color: var(--primary-color);
  transform: translateY(-2px);
}

/* ===== About Section ===== */
.about {
  background-color: var(--bg-white);
}

.about h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--text-dark);
}

.about p {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 900px;
  margin: 0 auto 1.5rem;
  line-height: 1.8;
}

/* ===== Professional Section ===== */
.professional {
  background-color: var(--bg-light);
}

.professional h2 {
  text-align: center;
  margin-bottom: 3rem;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.expertise-card {
  background-color: var(--bg-white);
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.expertise-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.expertise-card h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.expertise-card ul {
  list-style-position: inside;
  color: var(--text-light);
}

.expertise-card li {
  margin-bottom: 0.5rem;
}

.metrics {
  display: flex;
  justify-content: center;
  gap: 4rem;
  flex-wrap: wrap;
  margin-top: 3rem;
}

.metric {
  text-align: center;
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
}

.metric-label {
  font-size: 1rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== Services Section ===== */
.services {
  background-color: var(--bg-white);
}

.services h2 {
  text-align: center;
  margin-bottom: 1rem;
}

.section-intro {
  text-align: center;
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto 3rem;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.service-card {
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: 0.75rem;
  border: 2px solid var(--border-color);
  transition: var(--transition);
}

.service-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.service-card h3 {
  color: var(--text-dark);
  margin-bottom: 0.75rem;
}

.service-card p {
  color: var(--text-light);
  font-size: 1rem;
}

/* ===== Contact Section ===== */
.contact {
  background-color: var(--bg-light);
  text-align: center;
}

.contact h2 {
  margin-bottom: 1rem;
}

.contact > .container > p {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 2rem;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--bg-white);
  padding: 2rem;
  border-radius: 0.75rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.contact-item {
  font-size: 1.125rem;
  color: var(--text-dark);
}

.contact-item a {
  color: var(--primary-color);
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  background-color: var(--text-dark);
  color: white;
  text-align: center;
  padding: 2rem 0;
}

.footer p {
  margin: 0;
  opacity: 0.9;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--bg-white);
    width: 100%;
    text-align: center;
    transition: left 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 2rem 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .tagline {
    font-size: 1.25rem;
  }

  section {
    padding: 3rem 0;
  }

  h2 {
    font-size: 2rem;
  }

  .expertise-grid,
  .services-grid {
    grid-template-columns: 1fr;
  }

  .metrics {
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .tagline {
    font-size: 1rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }

  .metric-value {
    font-size: 2.5rem;
  }
}