:root {
  /* Primary color scheme - customize these for each project */
  --color-primary: #f39f21;
  --color-primary-dark: #d27c19;
  --color-primary-light: rgba(33, 150, 243, 0);

  /* Neutral colors */
  --color-text: #444;
  --color-text-light: #666;
  --color-text-lighter: #999;
  --color-text-dark: #333;
  --color-white: #fff;
  --color-bg-light: #f9f9f9;
  --color-bg-lighter: #f0f0f0;
  --color-border: #ddd;
  --color-border-light: #e0e0e0;
  --color-overlay: #1a1a1a;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 15px;
  --spacing-md: 20px;
  --spacing-lg: 30px;
  --spacing-xl: 40px;
  --spacing-2xl: 50px;
  --spacing-3xl: 80px;

  /* Typography */
  --font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans,
    Ubuntu, sans-serif;
  --font-size-base: 15px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 36px;
  --font-size-3xl: 48px;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;

  /* Shadows */
  --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.2);

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-full: 50%;

  /* Transitions */
  --transition-base: 0.3s;
}

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

body {
  font-family: var(--font-family);
  line-height: var(--line-height-base);
  color: var(--color-text);
}

.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--spacing-md);
}

/* Header */
.header {
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--spacing-sm);
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav > a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
}

.nav > a:hover,
.dropbtn:hover {
  color: var(--color-primary);
}

.dropdown {
  position: relative;
}

.dropbtn {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: var(--color-white);
  min-width: 220px;
  box-shadow: var(--shadow-xl);
  z-index: 1;
  border-radius: var(--radius-sm);
  inset-block-start: 100%;
  inset-inline-start: 0;
}

.dropdown-content a {
  color: var(--color-text);
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {
  background-color: var(--color-bg-lighter);
  color: var(--color-primary);
}

.dropdown:hover .dropdown-content {
  display: block;
}

.menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-md);
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-white);
  margin-block-start: 70px;
  background: url('../img/hero-bg.jpg') center/cover no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--color-primary-light);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-block-end: var(--spacing-sm);
  line-height: 1.2;
}

.hero p {
  font-size: var(--font-size-xl);
  margin-block-end: var(--spacing-lg);
}

.btn-learn {
  display: inline-block;
  background: var(--color-white);
  color: var(--color-primary);
  padding: 12px var(--spacing-lg);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}

.btn-learn:hover {
  background: var(--color-bg-lighter);
}

/* Service pages */
.service-hero {
  padding-block: 160px var(--spacing-3xl);
  margin-block-start: 0;
  background: var(--color-white);
}

.service-hero-inner {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-xl);
}

.service-hero-text {
  flex: 1;
}

.service-hero-text h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-block-end: var(--spacing-md);
  color: var(--color-text-dark);
}

.service-hero-text p {
  font-size: var(--font-size-md);
  color: var(--color-text-light);
  line-height: var(--line-height-relaxed);
}

.service-hero-image {
  flex: 1;
  text-align: center;
}

.service-hero-image img {
  max-width: 100%;
  height: auto;
  display: inline-block;
}

.service-section {
  padding-block: var(--spacing-3xl);
  background: var(--color-white);
}

.service-list {
  max-width: 600px;
  margin-inline: auto;
  padding-inline-start: var(--spacing-md);
}

.service-list li {
  margin-block-end: var(--spacing-xs);
  font-size: var(--font-size-base);
  color: var(--color-text-light);
}

/* Why Choose */
.why-choose {
  padding-block: var(--spacing-3xl);
  background: var(--color-bg-light);
}

h2 {
  text-align: center;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-block-end: var(--spacing-2xl);
  color: var(--color-text-dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.feature-box {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-box:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-box h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-block-end: var(--spacing-sm);
  color: var(--color-primary);
}

.feature-box p {
  color: var(--color-text-light);
  line-height: var(--line-height-relaxed);
  font-size: var(--font-size-base);
}

/* Facts */
.facts {
  padding-block: 60px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary-light)),
    url('../img/facts-bg.jpg') center/cover no-repeat;
  color: var(--color-white);
  position: relative;
}

.facts h2 {
  color: var(--color-white);
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  text-align: center;
}

.fact-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-block-end: 10px;
}

.fact-label {
  font-size: var(--font-size-lg);
  margin-block-end: var(--spacing-sm);
}

.fact-counter {
  font-size: var(--font-size-lg);
  opacity: 0.8;
}

/* Clients */
.clients {
  padding-block: var(--spacing-3xl);
  background: var(--color-bg-light);
}

.testimonials-slider {
  max-width: 900px;
  margin-inline: auto;
  min-height: 300px;
  position: relative;
}

.testimonial-slide {
  display: none;
  background: var(--color-white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
}

.testimonial-slide.active {
  display: block;
}

.testimonial-slide p {
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-light);
  margin-block-end: 25px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  flex-direction: column;
  border-block-start: 2px solid var(--color-border-light);
  padding-block-start: var(--spacing-sm);
}

.testimonial-author strong {
  font-size: var(--font-size-lg);
  color: var(--color-text-dark);
  margin-block-end: 5px;
}

.testimonial-author span {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
}

.slider-controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-block-start: var(--spacing-lg);
}

.slider-prev,
.slider-next {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-primary);
  background: var(--color-white);
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: all var(--transition-base);
}

.slider-prev:hover,
.slider-next:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Contact */
.contact-section {
  padding-block: var(--spacing-3xl);
  background: var(--color-white);
}

.contact-form {
  max-width: 600px;
  margin-inline: auto;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px var(--spacing-sm);
  margin-block-end: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-family: inherit;
}

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

.contact-form textarea {
  resize: vertical;
}

.contact-form button {
  width: 100%;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-sm);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-md);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-base);
}

.contact-form button:hover {
  background: var(--color-primary-dark);
}

.form-message {
  margin-block-start: var(--spacing-sm);
  padding: 12px;
  border-radius: var(--radius-sm);
  text-align: center;
  display: none;
}

.form-message.success {
  display: block;
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.form-message.error {
  display: block;
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* Footer */
.footer {
  background: var(--color-overlay);
  color: var(--color-white);
  padding-block: var(--spacing-lg);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  text-align: center;
}

.footer-logo {
  font-size: var(--font-size-lg);
  font-weight: 500;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  margin-inline: 10px;
}

.footer-nav a:hover {
  color: var(--color-white);
}

.copyright {
  font-size: var(--font-size-sm);
  opacity: 0.7;
}

/* Privacy page */
.privacy-content {
  padding-block: 120px var(--spacing-3xl);
  margin-block-start: 70px;
}

.privacy-content h1 {
  text-align: center;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-block-end: var(--spacing-2xl);
  color: var(--color-text-dark);
}

.privacy-content h3 {
  font-size: var(--font-size-md);
  font-weight: 700;
  margin-block: var(--spacing-lg) var(--spacing-sm);
  color: var(--color-primary);
}

.privacy-content p {
  color: var(--color-text-light);
  line-height: var(--line-height-relaxed);
  margin-block-end: var(--spacing-md);
}

.privacy-content ul {
  margin-block: var(--spacing-sm) var(--spacing-md);
  margin-inline-start: var(--spacing-xl);
  color: var(--color-text-light);
  line-height: var(--line-height-relaxed);
}

.privacy-content ul li {
  margin-block-end: 10px;
}

/* Modern features */
html {
  scroll-behavior: smooth;
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: fixed;
    inset-block-start: 70px;
    inset-inline: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }

  .nav.active {
    display: flex;
  }

  .dropdown-content {
    position: static;
    box-shadow: none;
    padding-inline-start: var(--spacing-md);
  }

  .menu-btn {
    display: block;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: var(--font-size-md);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .service-hero-inner {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .facts-grid {
    grid-template-columns: 1fr;
  }
}