/* MSK42DAO Website - Main Styles */

/* Font Face Declarations */
@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-var.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* CSS Custom Properties */
:root {
  /* Colors */
  --color-trust-blue: #1e40af;
  --color-trust-blue-light: #3b82f6;
  --color-trust-blue-dark: #1e3a8a;
  --color-safety-green: #16a34a;
  --color-safety-green-light: #22c55e;
  --color-safety-green-dark: #15803d;
  
  /* Neutral colors */
  --color-white: #ffffff;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-black: #000000;
  
  /* Typography */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  
  /* Line heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Spacing */
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  
  /* Border radius */
  --border-radius-sm: 0.125rem;
  --border-radius: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Container max-width */
  --container-max-width: 1200px;
  
  /* Grid pattern for signal detection motif */
  --grid-pattern: radial-gradient(circle at 1px 1px, var(--color-gray-200) 1px, transparent 0);
  --grid-size: 20px;
}

/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  
  /* Subtle grid background for signal detection motif */
  background-image: var(--grid-pattern);
  background-size: var(--grid-size) var(--grid-size);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-6);
}

h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-5);
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-4);
}

a {
  color: var(--color-trust-blue);
  text-decoration: underline;
  text-underline-offset: 0.125em;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-trust-blue-dark);
}

a:focus {
  outline: 2px solid var(--color-trust-blue);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-4);
  padding-left: var(--spacing-6);
}

li {
  margin-bottom: var(--spacing-2);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: var(--line-height-normal);
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--border-radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px; /* Accessibility: minimum touch target */
}

.btn:focus {
  outline: 2px solid var(--color-trust-blue);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-trust-blue);
  color: var(--color-white);
  border-color: var(--color-trust-blue);
}

.btn-primary:hover {
  background-color: var(--color-trust-blue-dark);
  border-color: var(--color-trust-blue-dark);
  color: var(--color-white);
}

.btn-secondary {
  background-color: var(--color-safety-green);
  color: var(--color-white);
  border-color: var(--color-safety-green);
}

.btn-secondary:hover {
  background-color: var(--color-safety-green-dark);
  border-color: var(--color-safety-green-dark);
  color: var(--color-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-trust-blue);
  border-color: var(--color-trust-blue);
}

.btn-outline:hover {
  background-color: var(--color-trust-blue);
  color: var(--color-white);
}

/* Layout */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-6);
  }
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--spacing-4);
  background-color: var(--color-trust-blue);
  color: var(--color-white);
  padding: var(--spacing-2) var(--spacing-4);
  text-decoration: none;
  border-radius: var(--border-radius);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-4);
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

/* Header */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) 0;
  gap: var(--spacing-4);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.logo a {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  text-decoration: none;
  color: var(--color-gray-900);
}

.logo a:focus {
  outline: 2px solid var(--color-trust-blue);
  outline-offset: 2px;
  border-radius: var(--border-radius);
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-trust-blue);
}

/* Navigation */
.main-nav {
  display: none;
}

@media (min-width: 768px) {
  .main-nav {
    display: block;
  }
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--border-radius);
}

.nav-toggle:focus {
  outline: 2px solid var(--color-trust-blue);
  outline-offset: 2px;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.hamburger {
  width: 20px;
  height: 2px;
  background-color: var(--color-gray-700);
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 2px;
  background-color: var(--color-gray-700);
  transition: all var(--transition-fast);
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  bottom: -6px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  bottom: 0;
}

.nav-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: var(--spacing-4);
  margin: 0;
  display: none;
}

.nav-menu.active {
  display: block;
}

@media (min-width: 768px) {
  .nav-menu {
    position: static;
    display: flex;
    background-color: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    gap: var(--spacing-6);
  }
}

.nav-menu li {
  margin-bottom: var(--spacing-2);
}

@media (min-width: 768px) {
  .nav-menu li {
    margin-bottom: 0;
  }
}

.nav-menu a {
  display: block;
  padding: var(--spacing-2) var(--spacing-3);
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-menu a:hover {
  background-color: var(--color-gray-100);
  color: var(--color-trust-blue);
}

.nav-menu a[aria-current="page"] {
  background-color: var(--color-trust-blue);
  color: var(--color-white);
}

.nav-menu a:focus {
  outline: 2px solid var(--color-trust-blue);
  outline-offset: 2px;
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: var(--spacing-2) var(--spacing-3);
  background-color: var(--color-gray-100);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  transition: all var(--transition-fast);
  min-height: 44px;
}

.lang-toggle:hover {
  background-color: var(--color-gray-200);
  border-color: var(--color-gray-400);
}

.lang-toggle:focus {
  outline: 2px solid var(--color-trust-blue);
  outline-offset: 2px;
}

.lang-toggle::after {
  content: '▼';
  font-size: var(--font-size-xs);
  transition: transform var(--transition-fast);
}

.lang-toggle[aria-expanded="true"]::after {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: var(--spacing-2);
  margin: 0;
  min-width: 120px;
  display: none;
  z-index: 10;
}

.lang-menu.active {
  display: block;
}

.lang-menu li {
  margin-bottom: 0;
}

.lang-menu a {
  display: block;
  padding: var(--spacing-2) var(--spacing-3);
  color: var(--color-gray-700);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  min-height: 36px;
  display: flex;
  align-items: center;
}

.lang-menu a:hover {
  background-color: var(--color-gray-100);
  color: var(--color-trust-blue);
}

.lang-menu a[aria-current="true"] {
  background-color: var(--color-trust-blue);
  color: var(--color-white);
}

/* Main content */
main {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-8) 0;
}

/* Footer */
.site-footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--spacing-12) 0 var(--spacing-6);
  margin-top: var(--spacing-16);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-content {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-section h3 {
  color: var(--color-white);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-4);
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section ul li {
  margin-bottom: var(--spacing-2);
}

.footer-section a {
  color: var(--color-gray-300);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--color-white);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

.footer-logo span {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-trust-blue-light);
}

.footer-tagline {
  font-size: var(--font-size-base);
  color: var(--color-gray-400);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--spacing-6);
  text-align: center;
}

.disclaimer {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  margin-bottom: var(--spacing-4);
  padding: var(--spacing-4);
  background-color: var(--color-gray-800);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--color-safety-green);
}

.copyright {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

/* Utility classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-gray-100: #e5e5e5;
    --color-gray-200: #cccccc;
    --color-gray-300: #b3b3b3;
    --color-gray-400: #808080;
    --color-gray-500: #666666;
    --color-gray-600: #4d4d4d;
    --color-gray-700: #333333;
    --color-gray-800: #1a1a1a;
  }
  
  .btn {
    border-width: 3px;
  }
  
  a {
    text-decoration: underline;
    text-decoration-thickness: 2px;
  }
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .lang-switcher {
    display: none;
  }
  
  body {
    background: white;
    color: black;
    font-size: 12pt;
    line-height: 1.4;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  p, li {
    page-break-inside: avoid;
  }
}