/* MD3 Design System - Green Theme */
:root {
  color-scheme: light;

  /* MD3 Primary Green Palette */
  --primary: #2e7d32;
  --primary-light: #60ad5e;
  --primary-lighter: #8bc34a;
  --primary-dark: #1b5e20;
  --primary-darker: #104116;

  /* MD3 Surface Colors */
  --surface: #fefefe;
  --surface-bright: #fefefe;
  --surface-dim: #f5f5f5;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f5f5f5;
  --surface-container: #ededed;
  --surface-container-high: #e6e6e6;
  --surface-container-highest: #dedede;

  /* MD3 Secondary Colors */
  --secondary: #00c853;
  --secondary-light: #5efc82;
  --secondary-dark: #009624;

  /* MD3 Tertiary Colors */
  --tertiary: #a5d6a7;

  /* MD3 Neutral Colors */
  --neutral: #79747e;
  --neutral-variant: #cac4d0;

  /* Text Colors */
  --on-surface: #1c1b1f;
  --on-surface-variant: #49454f;
  --on-primary: #ffffff;
  --on-secondary: #ffffff;
  --on-tertiary: #1c1b1f;

  /* State Layers (MD3) */
  --state-layer-primary-hover: rgba(46, 125, 50, 0.08);
  --state-layer-primary-pressed: rgba(46, 125, 50, 0.12);
  --state-layer-secondary-hover: rgba(0, 200, 83, 0.08);
  --state-layer-secondary-pressed: rgba(0, 200, 83, 0.12);
  --state-layer-surface-hover: rgba(28, 27, 31, 0.08);
  --state-layer-surface-pressed: rgba(28, 27, 31, 0.12);

  /* MD3 Elevation/Shadow */
  --elevation-0: none;
  --elevation-1: 0px 1px 3px rgba(0, 0, 0, 0.12), 0px 1px 2px rgba(0, 0, 0, 0.24);
  --elevation-2: 0px 3px 6px rgba(46, 125, 50, 0.08), 0px 3px 6px rgba(0, 0, 0, 0.15);
  --elevation-3: 0px 10px 20px rgba(46, 125, 50, 0.10), 0px 3px 6px rgba(0, 0, 0, 0.15);
  --elevation-4: 0px 15px 24px rgba(46, 125, 50, 0.12), 0px 5px 12px rgba(0, 0, 0, 0.15);

  /* Border Radius (MD3) */
  --radius-extra-small: 4px;
  --radius-small: 8px;
  --radius-medium: 12px;
  --radius-large: 16px;
  --radius-extra-large: 28px;

  /* Typography (MD3) */
  --font-family: "Roboto", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-size-label-large: 14px;
  --font-size-label-medium: 12px;
  --font-size-body-medium: 16px;
  --font-size-headline-small: 24px;
  --font-size-headline-medium: 28px;
  --font-size-headline-large: 32px;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--surface-dim);
  color: var(--on-surface);
  line-height: var(--line-height-normal);
  min-height: 100vh;
}

/* MD3 Header with Glassmorphism */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(254, 254, 254, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--font-size-body-medium);
  font-weight: var(--font-weight-bold);
  color: var(--on-surface);
}

.brand-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow:
    0 0 0 4px rgba(46, 125, 50, 0.12),
    0 2px 8px rgba(46, 125, 50, 0.3);
  transition: all 0.3s ease;
}

.brand:hover .brand-dot {
  transform: scale(1.2);
  box-shadow:
    0 0 0 6px rgba(46, 125, 50, 0.15),
    0 4px 12px rgba(46, 125, 50, 0.4);
}

.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.tabs a {
  position: relative;
  padding: 10px 20px;
  border-radius: var(--radius-large);
  text-decoration: none;
  color: var(--on-surface-variant);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-label-large);
  transition: all 0.2s ease;
  overflow: hidden;
}

.tabs a::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--state-layer-surface-hover);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.tabs a:hover::before {
  opacity: 1;
}

.tabs a:hover {
  color: var(--on-surface);
}

.tabs a.active {
  color: var(--on-primary);
  background: var(--primary);
  box-shadow: var(--elevation-2);
}

.tabs a.active::before {
  display: none;
}

/* MD3 Main Container */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

/* MD3 Hero Section */
.hero {
  padding: 48px 56px;
  border-radius: var(--radius-extra-large);
  background:
    linear-gradient(135deg, var(--surface) 0%, var(--surface-container-low) 100%);
  box-shadow: var(--elevation-2);
  border: 1px solid rgba(46, 125, 50, 0.1);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    rgba(46, 125, 50, 0.1) 0%,
    transparent 70%
  );
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -5%;
  width: 300px;
  height: 300px;
  background: radial-gradient(
    circle,
    rgba(0, 200, 83, 0.08) 0%,
    transparent 70%
  );
  border-radius: 50%;
  pointer-events: none;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: var(--font-size-headline-large);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

section {
  margin-top: 48px;
}

.section-title {
  margin: 0 0 24px;
  font-size: var(--font-size-headline-small);
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--on-surface);
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--on-primary);
  border-radius: var(--radius-large);
  font-size: var(--font-size-label-medium);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: var(--elevation-1);
}

/* MD3 Card Component */
.two-col {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
  background: var(--surface-container-low);
  border-radius: var(--radius-large);
  padding: 28px;
  box-shadow: var(--elevation-1);
  border: 1px solid rgba(46, 125, 50, 0.08);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--elevation-3);
  border-color: rgba(46, 125, 50, 0.15);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin: 0 0 12px;
  font-size: var(--font-size-headline-small);
  font-weight: var(--font-weight-bold);
  color: var(--on-surface);
}

.card p {
  margin: 0 0 16px;
  color: var(--on-surface-variant);
  line-height: var(--line-height-relaxed);
}

/* MD3 Button Variants */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  min-height: 40px;
  border-radius: var(--radius-large);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-label-large);
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

/* Filled Button (Primary) */
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--on-primary);
  box-shadow: var(--elevation-1);
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--state-layer-primary-hover);
  opacity: 0;
  transition: opacity 0.2s ease;
}

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

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:active {
  transform: translateY(0);
}

/* Outlined Button */
.btn-outlined {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  box-shadow: var(--elevation-0);
}

.btn-outlined::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--state-layer-primary-hover);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.btn-outlined:hover {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: var(--elevation-2);
}

.btn-outlined:hover::before {
  opacity: 1;
}

.btn-outlined:active {
  transform: translateY(0);
}

/* Filled Button (Secondary) */
.btn-secondary {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
  color: var(--on-secondary);
  box-shadow: var(--elevation-1);
}

.btn-secondary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--state-layer-secondary-hover);
  opacity: 0;
  transition: opacity 0.2s ease;
}

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

.btn-secondary:hover::before {
  opacity: 1;
}

.meta {
  margin-top: 12px;
  padding: 8px 12px;
  background: var(--surface-container);
  border-radius: var(--radius-small);
  font-size: var(--font-size-label-medium);
  color: var(--on-surface-variant);
  display: inline-block;
}

/* Contact Grid */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  background: var(--surface-container);
  border-radius: var(--radius-medium);
  margin: 4px 8px 4px 0;
  font-size: var(--font-size-label-medium);
  color: var(--on-surface-variant);
  border: 1px solid rgba(46, 125, 50, 0.12);
}

ul {
  margin: 16px 0 0;
  padding-left: 24px;
  color: var(--on-surface-variant);
}

li {
  margin: 10px 0;
  line-height: var(--line-height-relaxed);
}

/* MD3 Responsive Design */
@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .tabs {
    justify-content: center;
  }

  .hero {
    padding: 32px 24px;
  }

  .hero h1 {
    font-size: var(--font-size-headline-medium);
  }

  .two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  main {
    padding: 24px 16px 64px;
  }

  .hero {
    padding: 24px 20px;
  }

  .card {
    padding: 20px;
  }

  .tabs a {
    padding: 8px 16px;
  }
}