:root {
  /* Primary Colors */
  --color-primary-10: #002110;
  --color-primary-20: #00391b;
  --color-primary-30: #005227;
  --color-primary-40: #006d34;
  --color-primary-60: #1fa55b;
  --color-primary-95: #d4fbdf;

  /* Secondary Colors */
  --color-secondary-40: #d65a00;
  --color-secondary-60: #ff8a3d;

  /* Error Colors */
  --color-error-40: #c62828;

  /* Warning Colors */
  --color-warning-40: #f57c00;
  --color-warning-60: #ffa726;

  /* Success Colors */
  --color-success-40: #2e7d32;
  --color-success-60: #66bb6a;

  /* Neutral Colors */
  --color-neutral-0: #ffffff;
  --color-neutral-10: #fafafa;
  --color-neutral-20: #f5f5f5;
  --color-neutral-30: #eeeeee;
  --color-neutral-40: #e0e0e0;
  --color-neutral-50: #bdbdbd;
  --color-neutral-60: #9e9e9e;
  --color-neutral-70: #757575;
  --color-neutral-80: #616161;
  --color-neutral-90: #424242;
  --color-neutral-100: #212121;

  /* Expiry Status Colors */
  --color-expiry-safe: #66bb6a;
  --color-expiry-caution: #ffd54f;
  --color-expiry-warning: #ffa726;
  --color-expiry-urgent: #ff6f00;
  --color-expiry-expired: #9e9e9e;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-xxl: 32px;
  --spacing-xxxl: 48px;

  /* Border Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto',
    'Helvetica Neue', Arial, sans-serif;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.16);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.24);

  /* Transitions */
  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-standard: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--color-neutral-0);
  color: var(--color-neutral-100);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
}

h1 {
  font-size: 32px;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 28px;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 24px;
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: 20px;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

p {
  font-size: 16px;
  color: var(--color-neutral-80);
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary-40);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-60);
}

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

.section {
  padding: var(--spacing-xxxl) 0;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-neutral-0);
  border-bottom: 1px solid var(--color-neutral-30);
  z-index: 1000;
  transition: box-shadow var(--transition-standard);
}

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

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-neutral-100);
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 14px;
  color: var(--color-neutral-80);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary-40);
}

.lang-switch {
  display: flex;
  gap: var(--spacing-sm);
}

.lang-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 14px;
  border: 1px solid var(--color-neutral-40);
  border-radius: var(--radius-xs);
  background-color: transparent;
  color: var(--color-neutral-80);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background-color: var(--color-primary-40);
  border-color: var(--color-primary-40);
  color: var(--color-neutral-0);
}

.lang-btn:hover:not(.active) {
  background-color: var(--color-neutral-20);
}

/* Hero */
.hero {
  min-height: calc(100vh - 56px);
  display: flex;
  align-items: center;
  background: linear-gradient(
    135deg,
    var(--color-primary-95) 0%,
    var(--color-neutral-0) 100%
  );
  padding-top: 56px;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero-icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.hero-title {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-neutral-100);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--color-neutral-70);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0 var(--spacing-xl);
  height: 48px;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary-40);
  color: var(--color-neutral-0);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background-color: var(--color-primary-60);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

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

.btn-primary:disabled {
  background-color: var(--color-neutral-40);
  color: var(--color-neutral-60);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary-40);
  border: 1.5px solid var(--color-primary-40);
}

.btn-secondary:hover {
  background-color: var(--color-primary-95);
}

.btn-icon {
  width: 24px;
  height: 24px;
}

/* Features */
.features {
  background-color: var(--color-neutral-10);
}

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

.section-title h2 {
  color: var(--color-primary-40);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.feature-card {
  background-color: var(--color-neutral-0);
  padding: var(--spacing-xl);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-standard);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary-40);
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-neutral-100);
}

.feature-desc {
  color: var(--color-neutral-70);
  margin-bottom: 0;
}

/* About */
.about {
  background-color: var(--color-neutral-0);
}

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

/* FAQ */
.faq {
  background-color: var(--color-neutral-10);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--color-neutral-0);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: var(--spacing-lg);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.faq-question:hover {
  background-color: var(--color-neutral-10);
}

.faq-answer {
  padding: 0 var(--spacing-lg) var(--spacing-lg);
  color: var(--color-neutral-70);
  margin-bottom: 0;
}

.faq-icon {
  transition: transform var(--transition-standard);
}

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

/* Contact */
.contact {
  background-color: var(--color-neutral-0);
}

.contact-card {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: var(--spacing-xxl);
  background-color: var(--color-neutral-10);
  border-radius: var(--radius-lg);
}

.contact-icon {
  width: 64px;
  height: 64px;
  color: var(--color-primary-40);
  margin-bottom: var(--spacing-md);
}

.contact-email {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-40);
  margin-bottom: var(--spacing-lg);
}

.contact-links {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.contact-link {
  color: var(--color-neutral-80);
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--color-primary-40);
}

/* Footer */
.footer {
  background-color: var(--color-neutral-100);
  color: var(--color-neutral-50);
  padding: var(--spacing-xl) 0;
}

.footer-content {
  text-align: center;
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-link {
  color: var(--color-neutral-50);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-neutral-0);
}

.footer-copyright {
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 28px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .nav {
    gap: var(--spacing-md);
  }

  .nav-link {
    font-size: 12px;
  }

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

  .section {
    padding: var(--spacing-xxl) 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-icon {
    width: 96px;
    height: 96px;
  }

  .hero-title {
    font-size: 28px;
  }

  .btn {
    width: 100%;
  }
}