@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;600;700&family=Noto+Serif:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --primary: #a0c9ff;
  --on-primary: #00325a;
  --primary-container: #001125;
  --on-primary-container: #4f7fb7;
  --secondary: #a0d1b8;
  --on-secondary: #033826;
  --secondary-container: #22513e;
  --on-secondary-container: #92c3aa;
  
  --surface: #131313;
  --on-surface: #e5e2e1;
  --surface-variant: #353534;
  --on-surface-variant: #c6c6cb;
  
  --surface-container-lowest: #0e0e0e;
  --surface-container-low: #1c1b1b;
  --surface-container: #201f1f;
  --surface-container-high: #2a2a2a;
  --surface-container-highest: #353534;
  --surface-bright: #393939;

  --outline: #8f9095;
  --outline-variant: #45474b;
}

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

body {
  font-family: 'Manrope', -apple-system, sans-serif;
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, .display-serif {
  font-family: 'Noto Serif', serif;
  font-weight: 400;
  letter-spacing: -0.02em;
}

/* Glassmorphism Nav */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(32, 31, 31, 0.7); /* surface-container with opacity */
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  padding: 1.5rem 4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(69, 71, 75, 0.15); /* ghost border */
}

nav .logo {
  font-family: 'Noto Serif', serif;
  font-size: 1.5rem;
  color: var(--primary);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2.5rem;
}

nav a {
  color: var(--on-surface);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: color 0.3s ease;
}

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

/* Hero "Feature Monolith" */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface-container-lowest);
  position: relative;
  overflow: hidden;
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,1), rgba(0,0,0,0));
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1), rgba(0,0,0,0));
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 800px;
}

.hero-content .index-number {
  color: rgba(160, 209, 184, 0.5); /* secondary with opacity */
  font-size: 1rem;
  margin-bottom: 1rem;
  display: block;
}

.hero h1 {
  font-size: 4.5rem;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--on-surface);
}

.hero p {
  color: var(--on-surface-variant);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Intentional Asymmetry Layout */
section {
  padding: 8.5rem 4rem; /* 24 spacing token */
}

.section-grid {
  display: grid;
  grid-template-columns: 4fr 6fr;
  gap: 4rem;
  max-width: 1400px;
  margin: 0 auto;
}

.section-label {
  color: rgba(160, 209, 184, 0.5); /* secondary with opacity */
  font-size: 0.85rem;
  margin-bottom: 2rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.section-grid.offset-right h2 {
  grid-column: 1 / 2;
  font-size: 3rem;
  color: var(--on-surface);
}

.section-grid.offset-right .content {
  grid-column: 2 / 3;
  color: var(--on-surface-variant);
  font-size: 1.1rem;
}

.section-title h2 {
  font-size: 3rem;
  color: var(--on-surface);
  margin-bottom: 4rem;
}

/* Sections Backgrounds & Elevation */
.bg-low {
  background-color: var(--surface-container-low);
}

.bg-lowest {
  background-color: var(--surface-container-lowest);
}

/* Cards & Ambient Shadows */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2.5rem; /* ~list item separator */
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background-color: var(--surface-container);
  padding: 3rem;
  transition: all 0.4s ease;
  position: relative;
  /* Ambient shadow: 40px blur, primary color at 6% opacity */
  box-shadow: 0 10px 40px rgba(160, 201, 255, 0.06); 
  border-radius: 0; /* Sharp corners */
}

.card:hover {
  background-color: var(--surface-bright);
  transform: translateY(-5px);
  box-shadow: 0 10px 60px rgba(160, 201, 255, 0.1); 
}

.card h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--on-surface);
}

.card p {
  color: var(--on-surface-variant);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-size: 0.85rem; /* label-md */
  font-weight: 700;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0;
  transition: all 0.4s ease;
  margin-top: 2rem;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--on-primary-container) 100%);
  color: #001c37; /* on-primary-fixed */
}

.btn-primary:hover {
  background: #d2e4ff; /* primary-fixed */
  transform: scale(1.02);
}

.btn-secondary {
  background: transparent;
  color: var(--on-surface);
  border: 1px solid rgba(69, 71, 75, 0.15); /* outline variant at 15% */
}

.btn-secondary:hover {
  background: var(--surface-container-low);
  border-color: var(--outline-variant);
}

/* Inputs / Contact Form */
.form-group {
  margin-bottom: 2.5rem;
  position: relative;
}

.glass-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(143, 144, 149, 0.3); /* outline at 30% */
  padding: 0.5rem 0;
  color: var(--on-surface);
  font-family: 'Manrope', sans-serif;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

.glass-input:focus {
  outline: none;
  border-bottom-color: var(--primary);
}

.floating-label {
  position: absolute;
  left: 0;
  top: 0.5rem;
  color: var(--on-surface-variant);
  font-size: 0.85rem; /* label-sm */
  pointer-events: none;
  transition: 0.3s ease all;
}

.glass-input:focus ~ .floating-label,
.glass-input:not(:placeholder-shown) ~ .floating-label {
  top: -1.2rem;
  font-size: 0.75rem;
  color: var(--primary);
}

/* Footer */
footer {
  text-align: center;
  padding: 4rem;
  background-color: var(--surface-container-lowest);
  border-top: 1px solid rgba(69, 71, 75, 0.15); /* ghost border */
  color: var(--on-surface-variant);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 900px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .hero h1 {
    font-size: 3rem;
  }
  
  nav {
    padding: 1.5rem 2rem;
  }
}