/* Design Tokens */
:root {
  --color-primary: #23569D;
  --color-primary-light: #2E6DBF;
  --color-primary-dark: #1A3F75;
  --color-primary-fixed: #D6E4FF;
  --color-on-primary: #FFFFFF;
  --color-on-primary-container: #001D36;
  --color-secondary: #0061A4;
  --color-secondary-container: #D1E4FF;
  --color-surface: #F8F9FA;
  --color-surface-container: #EDEEEF;
  --color-surface-container-low: #F3F4F5;
  --color-on-surface: #191C1D;
  --color-on-surface-variant: #3F4A3C;
  --color-outline: #6F7A6B;
  --color-bg-white: #FFFFFF;

  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-20: 5rem;

  --font-family-heading: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-family-body: 'Lexend', system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);

  --container-max: 1200px;
  --header-height: 5rem;
}

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

body {
  font-family: var(--font-family-body);
  color: var(--color-on-surface);
  background: var(--color-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Material Symbols Outlined */
.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* Header Base */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #E2E8F0;
  box-shadow: var(--shadow-sm);
  container-type: inline-size;
  container-name: header;
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-6);
  max-width: var(--container-max);
  margin: 0 auto;
  gap: var(--space-4);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-on-surface);
  font-family: var(--font-family-heading);
  font-weight: 800;
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.header__logo-icon {
  color: var(--color-primary);
  font-size: 1.875rem;
}

/* Navigation */
.header__nav-list {
  list-style: none;
  display: none;
  align-items: center;
  gap: var(--space-8);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.header__nav-link {
  text-decoration: none;
  color: var(--color-on-surface-variant);
  padding-bottom: var(--space-1);
  transition: color 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

.header__nav-link--active {
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: var(--space-1);
}

/* Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__cta {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  background: var(--color-primary-fixed);
  color: var(--color-on-primary-container);
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-family: var(--font-family-body);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: opacity 300ms, transform 150ms;
}

.header__cta:hover {
  opacity: 0.9;
  transform: scale(0.98);
}

.header__cta-icon {
  font-size: 1.125rem;
}

/* Mobile Menu Toggle */
.header__menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  cursor: pointer;
  padding: 0;
  color: var(--color-on-surface);
}

.header__menu-toggle .material-symbols-outlined {
  font-size: 1.5rem;
}

/* Mobile Menu Open State */
.header__nav-list--open {
  display: flex;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background: var(--color-bg-white);
  flex-direction: column;
  padding: var(--space-8) var(--space-6);
  gap: var(--space-6);
  z-index: 99;
}

.header__nav-list--open .header__nav-link {
  font-size: var(--font-size-lg);
}

/* Container Queries - Tablet (768px) */
@container header (min-width: 768px) {
  .header__container {
    padding: 0 var(--space-12);
  }

  .header__nav-list {
    display: flex;
    position: static;
    flex-direction: row;
    height: auto;
    width: auto;
    padding: 0;
    background: none;
  }

  .header__nav-list--open {
    position: static;
    flex-direction: row;
    height: auto;
    width: auto;
    padding: 0;
    background: none;
  }

  .header__cta {
    display: inline-flex;
  }

  .header__menu-toggle {
    display: none;
  }
}

/* Container Queries - Desktop (1024px) */
@container header (min-width: 1024px) {
  .header__container {
    padding: 0 var(--space-12);
  }

  .header__nav-list {
    gap: var(--space-10);
  }
}