/* ============================================
   LAKESIDE RESEARCH - Patient Recruitment Platform
   Design System & Styles
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  /* Primary Colors - Medical Trust */
  --primary: #0D6E6E;
  --primary-dark: #094D4D;
  --primary-light: #E8F5F5;
  --primary-gradient: linear-gradient(135deg, #0D6E6E 0%, #0A5858 100%);
  
  /* Secondary Colors */
  --secondary: #2C8A8A;
  --accent: #F4A261;
  --accent-dark: #E07B3A;
  
  /* Neutrals */
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  
  /* Semantic Colors */
  --success: #059669;
  --success-light: #D1FAE5;
  --warning: #D97706;
  --warning-light: #FEF3C7;
  --error: #DC2626;
  --error-light: #FEE2E2;
  --info: #0284C7;
  --info-light: #E0F2FE;
  
  /* Score Colors */
  --score-high: #059669;
  --score-medium: #D97706;
  --score-low: #6B7280;
  
  /* Typography */
  --font-display: 'DM Sans', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Container */
  --container-max: 1200px;
  --container-narrow: 800px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-800);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
}

h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
}

.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

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

.container-narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--space-4xl) 0;
}

.section-sm {
  padding: var(--space-2xl) 0;
}

/* ---------- Header & Navigation ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--gray-900);
}

.logo-text span {
  color: var(--primary);
}

.nav-main {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-main a {
  font-weight: 500;
  color: var(--gray-600);
  padding: var(--space-sm) 0;
  position: relative;
}

.nav-main a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-base);
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--primary);
}

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

.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-phone {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--gray-700);
  font-weight: 600;
}

.header-phone svg {
  color: var(--primary);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

@media (max-width: 968px) {
  .nav-main, .header-cta {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-gradient);
  color: var(--white);
  box-shadow: 0 4px 14px 0 rgba(13, 110, 110, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(13, 110, 110, 0.4);
  color: var(--white);
}

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

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

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

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

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

/* ---------- Hero Section ---------- */
.hero {
  padding-top: 140px;
  padding-bottom: var(--space-4xl);
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 150%;
  background: radial-gradient(circle, rgba(13, 110, 110, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--white);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero h1 {
  font-size: 3.25rem;
  margin-bottom: var(--space-lg);
  line-height: 1.1;
}

.hero h1 span {
  color: var(--primary);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--gray-600);
  margin-bottom: var(--space-xl);
  max-width: 540px;
}

.hero-ctas {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
}

.hero-image-container {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.hero-image-container img {
  width: 100%;
  height: auto;
}

.hero-stats {
  position: absolute;
  bottom: -30px;
  left: -30px;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  gap: var(--space-xl);
}

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

.hero-stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--gray-500);
}

@media (max-width: 968px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-ctas {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
}

/* ---------- Audience Pathways ---------- */
.pathways {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  margin-top: calc(-1 * var(--space-3xl));
  position: relative;
  z-index: 10;
}

.pathway-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-lg);
  border: 2px solid transparent;
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.pathway-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.pathway-icon {
  width: 64px;
  height: 64px;
  background: var(--primary-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
}

.pathway-icon svg {
  width: 32px;
  height: 32px;
  color: var(--primary);
}

.pathway-card h3 {
  margin-bottom: var(--space-sm);
  color: var(--gray-900);
}

.pathway-card p {
  color: var(--gray-600);
  margin-bottom: var(--space-md);
}

.pathway-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--primary);
  font-weight: 600;
}

.pathway-link svg {
  transition: transform var(--transition-fast);
}

.pathway-card:hover .pathway-link svg {
  transform: translateX(4px);
}

@media (max-width: 768px) {
  .pathways {
    grid-template-columns: 1fr;
  }
}

/* ---------- Study Cards ---------- */
.studies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-xl);
}

.study-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid var(--gray-200);
}

.study-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.study-card-image {
  height: 180px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.study-card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--primary-gradient);
  opacity: 0.1;
}

.study-card-icon {
  width: 80px;
  height: 80px;
  background: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  position: relative;
  z-index: 1;
}

.study-card-badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  background: var(--success);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.study-card-content {
  padding: var(--space-xl);
}

.study-card h3 {
  margin-bottom: var(--space-sm);
}

.study-card-condition {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
}

.study-card p {
  color: var(--gray-600);
  margin-bottom: var(--space-lg);
}

.study-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  border-top: 1px solid var(--gray-200);
}

.study-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* ---------- Screening Questionnaire ---------- */
.screening-container {
  max-width: 700px;
  margin: 0 auto;
}

.screening-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.screening-progress {
  margin-bottom: var(--space-2xl);
}

.screening-progress-bar {
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.screening-progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.screening-progress-text {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-sm);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.screening-question {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-xl);
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.screening-question h3 {
  margin-bottom: var(--space-lg);
  font-size: 1.25rem;
}

.screening-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.screening-option {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--gray-50);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.screening-option:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.screening-option.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.screening-option input {
  display: none;
}

.screening-option-radio {
  width: 24px;
  height: 24px;
  border: 2px solid var(--gray-400);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.screening-option.selected .screening-option-radio {
  border-color: var(--primary);
  background: var(--primary);
}

.screening-option.selected .screening-option-radio::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--white);
  border-radius: 50%;
}

.screening-option-text {
  font-weight: 500;
  color: var(--gray-700);
}

.screening-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
}

/* ---------- Results Section ---------- */
.result-container {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.result-icon {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-xl);
  font-size: 3rem;
}

.result-high .result-icon {
  background: var(--success-light);
  color: var(--success);
}

.result-medium .result-icon {
  background: var(--warning-light);
  color: var(--warning);
}

.result-low .result-icon {
  background: var(--gray-100);
  color: var(--gray-500);
}

.result-title {
  margin-bottom: var(--space-md);
}

.result-high .result-title { color: var(--success); }
.result-medium .result-title { color: var(--warning); }
.result-low .result-title { color: var(--gray-600); }

.result-description {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: var(--space-2xl);
}

/* ---------- Lead Capture Form ---------- */
.lead-form {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-lg);
  text-align: left;
}

.lead-form h3 {
  margin-bottom: var(--space-lg);
  text-align: center;
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--gray-700);
}

.form-label.required::after {
  content: ' *';
  color: var(--error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  background: var(--white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 110, 110, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

@media (max-width: 576px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* Consent Checkboxes */
.consent-group {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--gray-200);
}

.consent-checkbox {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  cursor: pointer;
}

.consent-checkbox input {
  display: none;
}

.consent-checkbox-box {
  width: 22px;
  height: 22px;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  margin-top: 2px;
}

.consent-checkbox input:checked + .consent-checkbox-box {
  background: var(--primary);
  border-color: var(--primary);
}

.consent-checkbox input:checked + .consent-checkbox-box svg {
  display: block;
}

.consent-checkbox-box svg {
  display: none;
  width: 14px;
  height: 14px;
  color: var(--white);
}

.consent-checkbox-text {
  font-size: 0.9375rem;
  color: var(--gray-600);
  line-height: 1.5;
}

.consent-checkbox-text.required {
  color: var(--gray-700);
}

/* Low Priority Opt-in */
.optin-box {
  background: var(--gray-50);
  border: 1px dashed var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
}

.optin-box h4 {
  margin-bottom: var(--space-sm);
}

.optin-box p {
  color: var(--gray-600);
  margin-bottom: var(--space-lg);
}

.optin-form {
  display: flex;
  gap: var(--space-sm);
  max-width: 400px;
  margin: 0 auto;
}

.optin-form input {
  flex: 1;
}

/* ---------- Stats Section ---------- */
.stats-section {
  background: var(--primary-gradient);
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  text-align: center;
}

.stat-item {
  padding: var(--space-xl);
}

.stat-value {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.stat-label {
  font-size: 1rem;
  opacity: 0.9;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- Blog Section ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.blog-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.blog-card-image {
  height: 200px;
  background: var(--gray-200);
  position: relative;
}

.blog-card-category {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  background: var(--primary);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.blog-card-content {
  padding: var(--space-xl);
}

.blog-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.blog-card h3 a {
  color: var(--gray-900);
}

.blog-card h3 a:hover {
  color: var(--primary);
}

.blog-card-meta {
  font-size: 0.875rem;
  color: var(--gray-500);
}

@media (max-width: 968px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- FAQ Section ---------- */
.faq-list {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-800);
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding-bottom: var(--space-lg);
  color: var(--gray-600);
  line-height: 1.7;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding-top: var(--space-4xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid var(--gray-700);
}

.footer-brand p {
  margin-top: var(--space-md);
  margin-bottom: var(--space-lg);
  line-height: 1.7;
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  width: 40px;
  height: 40px;
  background: var(--gray-800);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--primary);
  color: var(--white);
}

.footer-column h4 {
  color: var(--white);
  margin-bottom: var(--space-lg);
  font-size: 1rem;
}

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

.footer-column li {
  margin-bottom: var(--space-sm);
}

.footer-column a {
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl) 0;
  font-size: 0.875rem;
}

.footer-bottom a {
  color: var(--gray-400);
}

.footer-affiliate {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

@media (max-width: 968px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--gray-600);
  font-size: 1.125rem;
}

/* ---------- CTA Section ---------- */
.cta-section {
  background: var(--primary-light);
  text-align: center;
}

.cta-content {
  max-width: 700px;
  margin: 0 auto;
}

.cta-content h2 {
  margin-bottom: var(--space-md);
}

.cta-content p {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: var(--space-xl);
}

.cta-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Utilities ---------- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-md); }
.mt-2 { margin-top: var(--space-xl); }
.mt-3 { margin-top: var(--space-2xl); }
.mt-4 { margin-top: var(--space-3xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-md); }
.mb-2 { margin-bottom: var(--space-xl); }
.mb-3 { margin-bottom: var(--space-2xl); }
.mb-4 { margin-bottom: var(--space-3xl); }

.hidden { display: none !important; }

/* ---------- Page-specific styles ---------- */
.page-header {
  padding-top: 140px;
  padding-bottom: var(--space-3xl);
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
  text-align: center;
}

.page-header h1 {
  margin-bottom: var(--space-md);
}

.page-header p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--gray-600);
  font-size: 1.125rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.breadcrumb a {
  color: var(--gray-500);
}

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

/* Study Detail Page */
.study-detail {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: var(--space-3xl);
  align-items: start;
}

.study-sidebar {
  position: sticky;
  top: 100px;
}

.study-sidebar-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
}

.study-sidebar-card h3 {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--gray-200);
}

.study-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.study-info-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.study-info-icon svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
}

.study-info-label {
  font-size: 0.875rem;
  color: var(--gray-500);
}

.study-info-value {
  font-weight: 600;
  color: var(--gray-800);
}

@media (max-width: 968px) {
  .study-detail {
    grid-template-columns: 1fr;
  }
  
  .study-sidebar {
    position: static;
  }
}

/* Sponsor Page Capabilities */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.capability-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-base);
}

.capability-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.capability-icon {
  width: 72px;
  height: 72px;
  background: var(--primary-light);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-lg);
}

.capability-icon svg {
  width: 36px;
  height: 36px;
  color: var(--primary);
}

.capability-card h3 {
  margin-bottom: var(--space-sm);
  font-size: 1.125rem;
}

.capability-card p {
  color: var(--gray-600);
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .capabilities-grid {
    grid-template-columns: 1fr;
  }
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.contact-info-card {
  background: var(--primary-gradient);
  color: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
}

.contact-info-card h3 {
  color: var(--white);
  margin-bottom: var(--space-lg);
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.contact-info-item svg {
  width: 24px;
  height: 24px;
  opacity: 0.9;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-info-item strong {
  display: block;
  margin-bottom: var(--space-xs);
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

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

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
}

.animate-on-scroll.animated {
  animation: slideUp 0.6s ease forwards;
}

/* Loading State */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--white);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  background: var(--gray-900);
  color: var(--white);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 9999;
  animation: slideUp 0.3s ease;
}

.toast.success {
  background: var(--success);
}

.toast.error {
  background: var(--error);
}