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

:root {
  /* Color Palette */
  --bg-color: #06070a; /* Deep cosmic dark */
  --surface-color: rgba(20, 22, 28, 0.35); /* Более прозрачный фон */
  --surface-border: rgba(255, 255, 255, 0.05);
  
  --text-primary: #f0f0f5;
  --text-secondary: #a0a4b8;
  
  --accent-gold: #D4AF37;
  --accent-gold-hover: #F3E5AB;
  --accent-emerald: #097969;
  
  /* Typography */
  --font-heading: 'Cinzel', serif;
  --font-body: 'Inter', sans-serif;
  
  /* Layout */
  --container-width: 1200px;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;
  
  /* Effects */
  --glass-blur: blur(4px); /* Меньше размытия, чтобы было видно связи */
  --shadow-subtle: 0 4px 30px rgba(0, 0, 0, 0.1);
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Neural Background Canvas */
#neural-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  background: transparent;
  opacity: 0.7; /* Уменьшение яркости на 30% */
}

body {
  background: radial-gradient(circle at center, #0B1120 0%, #060913 100%);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(1.25rem, 2.5vw, 2.25rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 300;
}

/* Layout Classes */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 2.5rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  text-decoration: none;
  border-radius: 1px;
  transition: var(--transition-smooth);
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background-color: transparent;
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
}

.btn-primary:hover {
  background-color: var(--accent-gold);
  color: var(--bg-color);
  box-shadow: 0 0 25px rgba(212, 175, 55, 0.2);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  background-color: rgba(255, 255, 255, 0.02);
}

.btn-floating {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  background-color: rgba(6, 7, 10, 0.9);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
  padding: 1rem 1.5rem;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.btn-floating:hover {
  background-color: rgba(212, 175, 55, 0.15);
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
  transform: translateY(-3px);
  color: var(--accent-gold-hover);
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--surface-color);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--surface-border);
  padding: var(--spacing-md);
  border-radius: 8px;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.glass-card:hover {
  transform: translateY(-5px);
  border-color: rgba(212, 175, 55, 0.3);
  background: rgba(30, 34, 43, 0.7);
}

/* Specific Blocks */
/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 100px;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
  width: 100%;
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.hero-image img {
  width: 100%;
  max-width: 450px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--accent-gold);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(212, 175, 55, 0.15);
  transition: transform 0.5s ease, border-color 0.5s ease, box-shadow 0.5s ease;
  opacity: 0.8; /* Прозрачность 20% */
}

.hero-image img:hover {
  transform: translateY(-5px);
  border-color: #F8E5A1;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.6), 0 0 40px rgba(212, 175, 55, 0.3);
}

.hero-text {
  flex: 1;
  text-align: left;
}

.hero-buttons {
  margin-top: 3rem;
  display: flex;
  gap: 1.5rem;
  justify-content: flex-start;
}

.hero-subtitle {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent-gold);
  margin-bottom: var(--spacing-sm);
  display: block;
}

/* Navbar */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.5rem 0;
  z-index: 1000;
  transition: var(--transition-smooth);
  backdrop-filter: blur(0px);
}

header.scrolled {
  background: rgba(6, 7, 10, 0.8);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--surface-border);
  padding: 1rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--accent-gold);
}

/* Disease Calculator */

/* Courses & Programs Grid */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  text-align: left;
}

.course-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.course-card h3 {
  color: var(--accent-gold);
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.course-subtitle {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.btn-sm {
  padding: 0.6rem 1.5rem;
  font-size: 0.85rem;
  align-self: flex-start;
}

/* Calculators */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.calc-input-group {
  margin-bottom: 1.5rem;
}

.calc-input-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.calc-input-group input, .calc-input-group select {
  width: 100%;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--surface-border);
  color: white;
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: var(--transition-smooth);
}

.calc-input-group input:focus, .calc-input-group select:focus {
  outline: none;
  border-color: var(--accent-gold);
}

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

.calc-result h3 {
  color: #ff4d4d;
  font-size: 2.5rem;
  margin: 1rem 0;
}

/* Animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.step-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  color: rgba(212, 175, 55, 0.2);
  position: absolute;
  top: 15px;
  right: 20px;
  line-height: 1;
}

/* Responsive */
@media (max-width: 768px) {
  .calc-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    display: none; /* simple mobile for now */
  }
  
  h1 {
    font-size: 1.25rem;
  }
  
  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 2rem;
  }
  
  .hero-text {
    text-align: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
}