/* ===================================
   Doron Therapeutics - Main Styles
   =================================== */

/* ===== CSS Variables ===== */
:root {
  /* Brand Colors */
  --color-teal: #19A2A4;
  --color-blue: #007276;
  --color-purple: #48166C;
  --color-rose: #D99694;
  --color-gray: #737373;
  --color-dark-gray: #A5A5A5;
  
  /* Primary Colors */
  --color-primary: #19A2A4;
  --color-primary-dark: #007276;
  --color-primary-light: #4DC4C6;
  --color-secondary: #48166C;
  --color-accent: #D99694;
  --color-success: #19A2A4;
  
  /* Neutrals */
  --color-dark: #0F172A;
  --color-dark-secondary: #1E293B;
  --color-gray: #737373;
  --color-gray-light: #A5A5A5;
  --color-gray-lighter: #F1F5F9;
  --color-white: #FFFFFF;
  
  /* Gradients - Subtle Same-Color Variations */
  --gradient-primary: linear-gradient(135deg, #19A2A4 0%, #15888A 100%);
  --gradient-accent: linear-gradient(135deg, #007276 0%, #005A5D 100%);
  --gradient-soft: linear-gradient(135deg, rgba(25, 162, 164, 0.03) 0%, rgba(25, 162, 164, 0.08) 100%);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-primary);
  color: var(--color-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--color-white);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 600;
  color: var(--color-dark);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
  color: var(--color-gray);
}

.lead {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--color-dark-secondary);
}

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

a:hover {
  color: var(--color-primary-dark);
}

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

em {
  font-style: italic;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

section {
  padding: clamp(4rem, 8vw, 6rem) 0;
}

/* ===== Navigation ===== */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: all var(--transition-base);
}

.main-nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo img {
  height: 40px;
  width: auto;
  display: block;
  transition: transform var(--transition-fast);
}

.logo:hover img {
  transform: scale(1.05);
}

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

.nav-link {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-dark);
  padding: var(--spacing-xs) var(--spacing-sm);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link:hover::after {
  width: 80%;
}

.nav-link.nav-cta {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-md);
}

.nav-link.nav-cta::after {
  display: none;
}

.nav-link.nav-cta:hover {
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Navigation Dropdown */
.nav-dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 0;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-sm);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  margin-top: var(--spacing-sm);
}

.nav-dropdown:hover .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-content a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-md);
  color: var(--color-dark-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
  width: 25px;
  height: 2px;
  background: var(--color-dark);
  transition: all var(--transition-base);
}

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

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

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

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.875rem 1.75rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(25, 162, 164, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(25, 162, 164, 0.4);
  color: var(--color-white);
}

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

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

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

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

.btn-white {
  background: white;
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn-white:hover {
  background: white;
  color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.btn-large {
  padding: 1.125rem 2.25rem;
  font-size: 1.125rem;
}

/* ===== Text Link ===== */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition-fast);
}

.text-link:hover {
  gap: var(--spacing-sm);
}

/* ===== Section Headers ===== */
.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto clamp(3rem, 6vw, 4rem);
}

.section-label {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-primary);
  color: white;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-xl);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-lg);
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-gray);
  margin-top: var(--spacing-md);
}

/* ===== Footer ===== */
.main-footer {
  background: var(--color-dark);
  color: var(--color-gray-light);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-logo {
  height: 40px;
  width: auto;
  margin-bottom: var(--spacing-md);
  filter: brightness(0) invert(1);
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--color-gray-light);
  margin-top: var(--spacing-sm);
}

.footer-section h4 {
  color: var(--color-white);
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

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

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--color-gray-light);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-bottom p {
  color: var(--color-gray-light);
  font-size: 0.875rem;
  margin: 0;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  font-size: 0.875rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}

.scale-in {
  opacity: 0;
  animation: scaleIn 0.6s ease forwards;
}

.fade-in-up.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in.animate-in {
  animation: fadeIn 0.6s ease forwards;
}

.scale-in.animate-in {
  animation: scaleIn 0.6s ease forwards;
}

/* Stagger animation delays */
.fade-in-up:nth-child(1) { animation-delay: 0.1s; }
.fade-in-up:nth-child(2) { animation-delay: 0.2s; }
.fade-in-up:nth-child(3) { animation-delay: 0.3s; }
.fade-in-up:nth-child(4) { animation-delay: 0.4s; }
.fade-in-up:nth-child(5) { animation-delay: 0.5s; }

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
  }
  
  section {
    padding: var(--spacing-2xl) 0;
  }
  
  .nav-container {
    height: 70px;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .dropdown-content {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background: var(--color-gray-lighter);
    margin-top: var(--spacing-xs);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
  }
  
  .btn-large {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
  }
}