/* ========================================
   RESET & BASE STYLES
   ======================================== */

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

/* ========================================
   CSS VARIABLES
   ======================================== */

:root {
  /* Colors */
  --color-primary: #ffffff;
  --color-primary-2: #efeff2;
  --color-secondary: #79a0cc;
  --color-secondary-2: #6f79a2;
  --color-secondary-3: #337acc;

  /* Border Radius */
  --border-radius-outer: 20px;
  --border-radius-inner: 10px;

  /* Text Colors */
  --text-primary: #10101a;
  --text-secondary: #50505a;

  /* Font Sizes */
  --font-size-small: clamp(11px, 2vw, 12px);
  --font-size-base: clamp(13px, 2.5vw, 14px);
  --font-size-subtitle: clamp(15px, 3vw, 16px);
  --font-size-title: clamp(18px, 3.5vw, 20px);
  --font-size-title-xl: clamp(24px, 5vw, 32px);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 10px;
  --spacing-md: 20px;
  --spacing-lg: 40px;

  /* Transitions */
  --transition-base: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   HTML & BODY
   ======================================== */

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow-x: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
    "Segoe UI Symbol";
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--color-primary-2);
  max-height: 100dvh;
  min-height: 100vh; /* Fallback for browsers that don't support dvh */
  min-height: 100dvh;
}

/* ========================================
   LAYOUT CONTAINERS
   ======================================== */

.wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 100vh; /* Fallback */
  min-height: 100dvh;
  padding: var(--spacing-md);
}

.container {
  display: grid;
  grid-template-rows: auto 1fr;
  width: 100%;
  height: 100%;
  min-height: 600px;
  max-width: 1200px;
  background-color: var(--color-primary);
  border: 2px solid var(--color-secondary);
  border-radius: var(--border-radius-outer);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

/* ========================================
   NAVIGATION
   ======================================== */

nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  width: 100%;
  border-bottom: 2px solid var(--color-secondary);
  padding: var(--spacing-sm);
  background-color: var(--color-primary);
}

nav > a {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: var(--font-size-base);
  height: 100%;
  -webkit-tap-highlight-color: transparent;
}

nav > a:focus {
  outline: 2px solid var(--color-secondary);
  outline-offset: 4px;
  border-radius: 4px;
}

nav > a:focus:not(:focus-visible) {
  outline: none;
}

nav > a > .icon {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50px;
  height: 50px;
  border: 2px solid var(--color-secondary);
  border-radius: 50%;
  background-color: var(--color-primary);
  transition: background-color 0.2s ease;
}

nav > a svg {
  stroke: var(--color-secondary);
  transition: stroke 0.2s ease;
  width: 30px;
  height: 30px;
}

nav > a.active > .icon {
  background-color: var(--color-secondary);
}

nav > a.active svg,
nav > a.active svg *,
nav > a.active svg > path {
  stroke: var(--color-primary);
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

h1 {
  font-weight: 800;
  text-transform: uppercase;
  font-size: var(--font-size-title-xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-title);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-subtitle);
}

h4 {
  font-weight: 600;
  font-size: var(--font-size-subtitle);
}

p {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

a {
  color: var(--color-secondary-3);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-secondary-2);
  text-decoration: underline;
}

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

a:focus:not(:focus-visible) {
  outline: none;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-secondary);
  color: var(--color-primary);
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* ========================================
   UTILITIES
   ======================================== */

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

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

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablet */
@media screen and (max-width: 900px) {
  :root {
    --border-radius-outer: 15px;
    --border-radius-inner: 8px;
  }

  .wrapper {
    padding: var(--spacing-sm);
  }
}

/* Mobile */
@media screen and (max-width: 600px) {
  :root {
    --spacing-md: 15px;
    --spacing-sm: 8px;
  }

  .wrapper {
    padding: 8px;
  }

  .container {
    min-height: 500px;
    border-radius: 12px;
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  body {
    background: white;
  }

  .wrapper {
    padding: 0;
  }

  .container {
    border: none;
    box-shadow: none;
    max-width: 100%;
  }

  nav {
    display: none;
  }

  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
}

/* ========================================
   PERFORMANCE OPTIMIZATIONS
   ======================================== */

/* GPU acceleration for animations */
nav > a > .icon,
nav > a {
  will-change: transform;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-secondary: #0056b3;
    --text-primary: #000000;
    --text-secondary: #333333;
  }

  .container {
    border-width: 3px;
  }

  nav > a > .icon {
    border-width: 3px;
  }
}