/* ============================================
   PRAMUS - Research Dossier Layout CSS
   Theme: Botanical Extracts for Joint Wellness
   ============================================ */

/* Color Palette */
:root {
  --primary: #2F4F4F;        /* Dark Slate Gray */
  --secondary: #8FBC8F;      /* Dark Sea Green */
  --accent-light: #D8BFD8;   /* Thistle */
  --accent-dark: #A52A2A;    /* Brown */
  --bg-light: #F8F8F8;       /* Off-white */
  --bg-lighter: #FFFFFF;     /* White */
  --border-color: #E0E0E0;   /* Light Gray */
  --text-primary: #2F4F4F;   /* Dark Slate Gray */
  --text-secondary: #555555; /* Medium Gray */
  --spacing-unit: 8px;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Lora:wght@400;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-light);
  line-height: 1.6;
  letter-spacing: 0.3px;
}

h1 {
  font-family: 'Lora', serif;
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.8px;
  color: var(--primary);
  margin-bottom: calc(var(--spacing-unit) * 3);
  margin-top: 0;
}

h2 {
  font-family: 'Lora', serif;
  font-size: 2.5rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--primary);
  margin-bottom: calc(var(--spacing-unit) * 2.5);
  margin-top: calc(var(--spacing-unit) * 4);
}

h3 {
  font-family: 'Lora', serif;
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--secondary);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
  margin-top: calc(var(--spacing-unit) * 2.5);
}

p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: calc(var(--spacing-unit) * 2);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.3s ease;
  border-bottom: 1px solid transparent;
}

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

/* ============================================
   LAYOUT STRUCTURE
   ============================================ */

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 3);
}

.section {
  padding: calc(var(--spacing-unit) * 6) 0;
  margin: calc(var(--spacing-unit) * 4) 0;
}

.section--full-width {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  padding: calc(var(--spacing-unit) * 6) calc(50vw - 50%);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: calc(var(--spacing-unit) * 3);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--spacing-unit) * 4);
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--spacing-unit) * 3);
}

.col-span-6 {
  grid-column: span 6;
}

.col-span-4 {
  grid-column: span 4;
}

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

header {
  position: sticky;
  top: 0;
  background-color: var(--bg-lighter);
  border-bottom: 2px solid var(--border-color);
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: 'Lora', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
}

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

nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: calc(var(--spacing-unit) * 0.5) 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s ease;
}

nav a:hover,
nav a.active {
  border-bottom-color: var(--secondary);
  color: var(--secondary);
}

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

.hero {
  background-color: var(--bg-light);
  padding: calc(var(--spacing-unit) * 8) 0;
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--spacing-unit) * 4);
  align-items: center;
}

.hero-text h1 {
  font-size: 3.5rem;
  line-height: 1.2;
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.hero-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: calc(var(--spacing-unit) * 3);
}

.hero-image {
  position: relative;
  overflow: hidden;
  border-radius: 0;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* ============================================
   BUTTONS & CTAE
   ============================================ */

.btn {
  display: inline-block;
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
  background-color: var(--primary);
  color: var(--bg-lighter);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  border-radius: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

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

.btn--outline {
  background-color: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

/* ============================================
   CONTENT BLOCKS
   ============================================ */

.content-block {
  background-color: var(--bg-lighter);
  padding: calc(var(--spacing-unit) * 3);
  border-left: 4px solid var(--secondary);
  margin: calc(var(--spacing-unit) * 2) 0;
}

.content-block h3 {
  margin-top: 0;
}

.text-image-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: calc(var(--spacing-unit) * 4);
  align-items: center;
  margin: calc(var(--spacing-unit) * 6) 0;
}

.text-image-block.reverse {
  grid-template-columns: 1fr 1fr;
  direction: rtl;
}

.text-image-block.reverse > * {
  direction: ltr;
}

.text-image-block img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   IMAGE STYLES
   ============================================ */

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.image-container {
  position: relative;
  overflow: hidden;
  margin: calc(var(--spacing-unit) * 3) 0;
}

.image-container img {
  width: 100%;
  transition: transform 0.5s ease;
}

.image-container:hover img {
  transform: scale(1.02);
}

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

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

li {
  margin-bottom: calc(var(--spacing-unit) * 1);
  line-height: 1.8;
  color: var(--text-secondary);
}

blockquote {
  font-family: 'Lora', serif;
  font-size: 1.2rem;
  font-style: italic;
  color: var(--secondary);
  padding-left: calc(var(--spacing-unit) * 3);
  border-left: 4px solid var(--accent-light);
  margin: calc(var(--spacing-unit) * 3) 0;
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background-color: var(--bg-lighter);
  border: 1px solid var(--border-color);
  padding: calc(var(--spacing-unit) * 3);
  transition: all 0.3s ease;
  cursor: pointer;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}

.card img {
  width: 100%;
  margin-bottom: calc(var(--spacing-unit) * 2);
  max-height: 250px;
  object-fit: cover;
}

.card h3 {
  margin-top: 0;
}

.card p {
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

/* ============================================
   DISCLAIMER / CONTEXT BLOCK
   ============================================ */

.disclaimer {
  background-color: #FEF5E7;
  border-left: 4px solid var(--accent-dark);
  padding: calc(var(--spacing-unit) * 2.5);
  margin: calc(var(--spacing-unit) * 4) 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.disclaimer h3 {
  color: var(--accent-dark);
  margin-top: 0;
}

.disclaimer-warning {
  background-color: #FDF2F2;
  border: 1px solid var(--border-color);
  padding: calc(var(--spacing-unit) * 2);
  margin: calc(var(--spacing-unit) * 3) 0;
  text-align: center;
  font-weight: 600;
  color: var(--accent-dark);
}

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

footer {
  background-color: var(--primary);
  color: var(--bg-lighter);
  padding: calc(var(--spacing-unit) * 6) 0;
  margin-top: calc(var(--spacing-unit) * 8);
}

footer a {
  color: var(--accent-light);
  border-bottom: 1px solid transparent;
}

footer a:hover {
  border-bottom-color: var(--accent-light);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: calc(var(--spacing-unit) * 4);
  margin-bottom: calc(var(--spacing-unit) * 4);
}

.footer-section h3 {
  color: var(--accent-light);
  font-size: 1.2rem;
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

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

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

.footer-divider {
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: calc(var(--spacing-unit) * 3);
  margin-top: calc(var(--spacing-unit) * 3);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: calc(var(--spacing-unit) * 3);
  border-top: 1px solid rgba(255,255,255,0.2);
}

.footer-bottom p {
  margin: 0;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

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

@media (max-width: 1024px) {
  .grid-2,
  .hero-content,
  .text-image-block {
    grid-template-columns: 1fr;
  }

  .text-image-block.reverse {
    direction: ltr;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.3rem;
  }

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

@media (max-width: 768px) {
  .container {
    padding: 0 calc(var(--spacing-unit) * 2);
  }

  .section {
    padding: calc(var(--spacing-unit) * 4) 0;
  }

  nav ul {
    gap: calc(var(--spacing-unit) * 2);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  nav ul {
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1.5);
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-large {
  margin-top: calc(var(--spacing-unit) * 6);
}

.mb-large {
  margin-bottom: calc(var(--spacing-unit) * 6);
}

.hidden {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}