:root {
  /* Keep Hearing Brand Colors */
  --color-navy: #00527a;
  --color-navy-dark: #003d5c;
  --color-navy-light: #00678f;
  --color-blue: #0092d2;
  --color-blue-light: #33aade;
  --color-white: #ffffff;
  --color-gray-light: #f5f7fa;
  --color-gray: #6b7280;
  --color-gray-dark: #374151;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-blue) 0%, var(--color-blue-light) 100%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Poppins', var(--font-primary);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--color-gray-dark);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-navy);
  margin-bottom: var(--spacing-sm);
}

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);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-gray-dark);
  font-size: 1.125rem;
  line-height: 1.8;
}

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

a:hover {
  color: var(--color-blue-light);
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-navy);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
}

.logo-img {
  height: 50px;
  width: auto;
  transition: opacity var(--transition-fast);
}

.logo:hover .logo-img {
  opacity: 0.8;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-menu a {
  color: var(--color-navy);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transform: translateX(-50%);
  transition: width var(--transition-normal);
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-navy);
  cursor: pointer;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-primary);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(circle, rgba(93, 143, 214, 0.15) 0%, transparent 70%);
  animation: float 20s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }

  50% {
    transform: translate(-50px, 50px) rotate(5deg);
  }
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease;
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.25rem;
  max-width: 800px;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.8s ease 0.2s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

/* Section */
.section {
  padding: var(--spacing-xl) 0;
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-slow);
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-alt {
  background-color: var(--color-gray-light);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

/* Cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-navy);
}

.card p {
  font-size: 1rem;
  color: var(--color-gray);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

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

/* Content Block */
.content-block {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.content-block h2 {
  margin-bottom: var(--spacing-md);
}

/* Video/Session Grid */
.sessions-grid {
  display: grid;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.session-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border-left: 4px solid var(--color-blue);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.session-item:hover {
  border-left-color: var(--color-blue-light);
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.session-item h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.session-item p {
  color: var(--color-gray);
  font-size: 1rem;
}

/* Footer */
.footer {
  background: var(--color-navy-dark);
  color: var(--color-white);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

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

.footer h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-sm);
}

.footer a {
  color: var(--color-blue-light);
  transition: color var(--transition-fast);
}

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

.footer p {
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--spacing-md);
  font-size: 0.9rem;
}

/* Alert/Notice Box */
.notice-box {
  background: linear-gradient(135deg, rgba(93, 143, 214, 0.1) 0%, rgba(93, 143, 214, 0.05) 100%);
  border-left: 4px solid var(--color-blue);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.notice-box p {
  margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }

  .mobile-toggle {
    display: block;
  }

  .hero {
    min-height: 80vh;
  }

  .container {
    padding: var(--spacing-md) var(--spacing-sm);
  }

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

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

  .nav-container {
    padding: var(--spacing-sm);
  }

  .logo-img {
    height: 35px;
    max-width: 180px;
  }

  .mobile-toggle {
    z-index: 1001;
    position: relative;
  }
}