/* ============================================
   PMERGON - MODERN INSTITUTIONAL TECH REVIEW DESIGN
   Color Palette: #ECEFF1, #3F51B5, #FFCA28, #4CAF50
   ============================================ */

:root {
  --primary-bg: #ECEFF1;
  --primary-accent: #3F51B5;
  --secondary-accent: #FFCA28;
  --success-accent: #4CAF50;
  --dark-text: #424242;
  --medium-text: #757575;
  --white: #FFFFFF;
  --baseline: 8px;
  --max-width: 1440px;
}

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

/* ============================================
   TYPOGRAPHY & BASE STYLES
   ============================================ */

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Lato', 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--dark-text);
  background-color: var(--primary-bg);
  line-height: 1.6;
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Source Sans Pro', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.2;
  margin-bottom: calc(var(--baseline) * 2);
  color: var(--dark-text);
  font-weight: 600;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: calc(var(--baseline) * 3);
  color: var(--primary-accent);
  text-align: center;
}

h2 {
  font-size: 2.25rem;
  margin-bottom: calc(var(--baseline) * 3);
  color: var(--primary-accent);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: calc(var(--baseline) * 2);
  color: var(--dark-text);
}

p {
  margin-bottom: calc(var(--baseline) * 2);
  line-height: 1.8;
  color: var(--dark-text);
}

a {
  color: var(--primary-accent);
  text-decoration: none;
  transition: all 0.3s ease-in-out;
}

a:hover {
  color: var(--secondary-accent);
  text-decoration: underline;
}

/* ============================================
   LAYOUT & CONTAINER
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 calc(var(--baseline) * 3);
}

.section {
  padding: calc(var(--baseline) * 12) 0;
}

.section-full-width {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  padding: calc(var(--baseline) * 12) 0;
}

.section-bg {
  background-color: var(--white);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
  position: sticky;
  top: 0;
  background-color: var(--white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  z-index: 1000;
}

.header-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--baseline) * 2) calc(var(--baseline) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-accent);
  letter-spacing: 0.05em;
}

nav ul {
  list-style: none;
  display: flex;
  gap: calc(var(--baseline) * 3);
}

nav a {
  color: var(--dark-text);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding-bottom: calc(var(--baseline) * 0.5);
}

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

nav a:hover::after,
nav a.active::after {
  width: 100%;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  background: linear-gradient(135deg, var(--primary-accent) 0%, rgba(63, 81, 181, 0.85) 100%),
              url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><rect fill="%23ECEFF1" width="1200" height="600"/></svg>');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(63, 81, 181, 0.15);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  color: var(--white);
  max-width: 900px;
}

.hero h1 {
  color: var(--white);
  font-size: 3.5rem;
  margin-bottom: calc(var(--baseline) * 2);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: calc(var(--baseline) * 3);
  line-height: 1.7;
}

/* ============================================
   TWO-COLUMN LAYOUT (Text + Image)
   ============================================ */

.layout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--baseline) * 4);
  align-items: center;
}

.layout-grid.reverse {
  grid-template-columns: 1fr 1fr;
}

.layout-grid.reverse > :first-child {
  order: 2;
}

.layout-grid.reverse > :last-child {
  order: 1;
}

.layout-content {
  padding: calc(var(--baseline) * 2) 0;
}

.layout-image {
  width: 100%;
  height: auto;
  border-radius: 4px;
  display: block;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* ============================================
   CARDS & CONTENT BLOCKS
   ============================================ */

.card {
  background-color: var(--white);
  padding: calc(var(--baseline) * 3);
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease-in-out;
}

.card:hover {
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: calc(var(--baseline) * 3);
  margin-top: calc(var(--baseline) * 3);
}

/* ============================================
   BUTTONS & LINKS
   ============================================ */

.btn {
  display: inline-block;
  padding: calc(var(--baseline) * 1.5) calc(var(--baseline) * 3);
  background-color: var(--primary-accent);
  color: var(--white);
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease-in-out;
  border: 2px solid var(--primary-accent);
  cursor: pointer;
  text-align: center;
}

.btn:hover {
  background-color: var(--white);
  color: var(--primary-accent);
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--secondary-accent);
  border-color: var(--secondary-accent);
  color: var(--dark-text);
}

.btn-secondary:hover {
  background-color: var(--white);
  color: var(--secondary-accent);
}

.btn-accent {
  background-color: var(--success-accent);
  border-color: var(--success-accent);
  color: var(--white);
}

.btn-accent:hover {
  background-color: var(--white);
  color: var(--success-accent);
}

/* ============================================
   LISTS & TYPOGRAPHY ELEMENTS
   ============================================ */

ul, ol {
  margin-left: calc(var(--baseline) * 3);
  margin-bottom: calc(var(--baseline) * 2);
}

li {
  margin-bottom: calc(var(--baseline) * 1.5);
  line-height: 1.8;
}

strong {
  font-weight: 600;
  color: var(--primary-accent);
}

em {
  font-style: italic;
  color: var(--medium-text);
}

/* ============================================
   BLOCKQUOTE
   ============================================ */

blockquote {
  border-left: 4px solid var(--primary-accent);
  padding-left: calc(var(--baseline) * 2);
  margin: calc(var(--baseline) * 3) 0;
  color: var(--medium-text);
  font-style: italic;
  font-size: 1.05rem;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  background-color: var(--white);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding: calc(var(--baseline) * 6) calc(var(--baseline) * 3);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: calc(var(--baseline) * 4);
  margin-bottom: calc(var(--baseline) * 4);
}

.footer-section h4 {
  font-size: 1rem;
  margin-bottom: calc(var(--baseline) * 2);
  color: var(--primary-accent);
  font-weight: 600;
}

.footer-section ul {
  list-style: none;
  margin: 0;
}

.footer-section li {
  margin-bottom: calc(var(--baseline) * 1);
}

.footer-section a {
  color: var(--medium-text);
  font-size: 0.9rem;
  transition: color 0.3s ease-in-out;
}

.footer-section a:hover {
  color: var(--primary-accent);
}

.footer-bottom {
  text-align: center;
  padding-top: calc(var(--baseline) * 3);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  color: var(--medium-text);
  font-size: 0.9rem;
}

.footer-bottom a {
  color: var(--medium-text);
}

/* ============================================
   CONTACT FORM
   ============================================ */

.form-group {
  margin-bottom: calc(var(--baseline) * 3);
}

label {
  display: block;
  margin-bottom: calc(var(--baseline) * 1);
  font-weight: 500;
  color: var(--dark-text);
}

input[type="text"],
input[type="email"],
input[type="tel"],
textarea {
  width: 100%;
  padding: calc(var(--baseline) * 1.5) calc(var(--baseline) * 1.5);
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--dark-text);
  transition: all 0.3s ease-in-out;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(63, 81, 181, 0.1);
}

textarea {
  resize: vertical;
  min-height: 150px;
}

/* ============================================
   BREADCRUMBS
   ============================================ */

.breadcrumb {
  list-style: none;
  display: flex;
  gap: calc(var(--baseline) * 1);
  margin-bottom: calc(var(--baseline) * 3);
  font-size: 0.9rem;
  color: var(--medium-text);
}

.breadcrumb li::after {
  content: '/';
  margin-left: calc(var(--baseline) * 1);
  color: var(--medium-text);
}

.breadcrumb li:last-child::after {
  content: '';
}

.breadcrumb a {
  color: var(--primary-accent);
}

/* ============================================
   SECTION HEADERS
   ============================================ */

.section-header {
  margin-bottom: calc(var(--baseline) * 6);
}

.section-header h2 {
  text-align: center;
  margin-bottom: calc(var(--baseline) * 2);
}

.section-subheader {
  text-align: center;
  color: var(--medium-text);
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
  margin-bottom: calc(var(--baseline) * 4);
  line-height: 1.8;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.25rem;
  }

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

  .layout-grid.reverse > :first-child {
    order: 1;
  }

  .layout-grid.reverse > :last-child {
    order: 2;
  }

  nav ul {
    gap: calc(var(--baseline) * 1.5);
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--white);
    padding: calc(var(--baseline) * 2);
    display: none;
  }

  nav ul.active {
    display: flex;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .section {
    padding: calc(var(--baseline) * 6) 0;
  }

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

  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-content {
    flex-direction: column;
    gap: calc(var(--baseline) * 2);
  }

  nav ul {
    position: static;
    flex-direction: row;
    gap: calc(var(--baseline) * 1);
    padding: 0;
    background-color: transparent;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero {
    min-height: 400px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .section {
    padding: calc(var(--baseline) * 3) 0;
  }
}