/* World-Class Courier Website - Base Styles */
/* Following complete specification */

/* ============================================
   FONT IMPORTS
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ============================================
   RESET & BASE
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  font-weight: var(--font-weight-normal);
  color: var(--color-neutral-20);
  background-color: var(--color-neutral-90);
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--font-weight-bold);
  color: var(--color-navy);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-h1);
  line-height: var(--line-height-h1);
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-h2);
  font-weight: var(--font-weight-bold);
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-h3);
  font-weight: var(--font-weight-semibold);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-neutral-20);
}

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

a:hover {
  color: var(--color-primary-600);
}

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

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-button);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-button);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  min-height: 44px; /* WCAG touch target */
  min-width: 44px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-neutral-90);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background-color: var(--color-primary-600);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  color: var(--color-neutral-90);
}

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

.btn-secondary {
  background-color: var(--color-neutral-70);
  color: var(--color-navy);
  border: 1px solid var(--color-neutral-60);
}

.btn-secondary:hover {
  background-color: var(--color-neutral-60);
  color: var(--color-navy);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-neutral-90);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-body);
  min-height: 52px;
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-small);
  min-height: 36px;
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-navy);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-body);
  font-family: var(--font-primary);
  line-height: var(--line-height-body);
  color: var(--color-navy);
  background-color: var(--color-neutral-90);
  border: 1px solid var(--color-neutral-60);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  min-height: 44px;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-input::placeholder {
  color: var(--color-neutral-40);
}

.form-input:disabled {
  background-color: var(--color-neutral-70);
  color: var(--color-neutral-40);
  cursor: not-allowed;
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background-color: var(--color-neutral-90);
  border: 1px solid var(--color-neutral-60);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.card-elevated {
  box-shadow: var(--shadow-lg);
}

/* ============================================
   GRID SYSTEM
   ============================================ */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1023px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 639px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none; }
@media (min-width: 640px) {
  .hidden-sm { display: none; }
  .block-sm { display: block; }
}
@media (min-width: 1024px) {
  .hidden-md { display: none; }
  .block-md { display: block; }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
.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;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-neutral-90);
  padding: var(--space-2) var(--space-4);
  z-index: var(--z-tooltip);
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.animate-slide-in {
  animation: slideIn var(--transition-slow) ease-out;
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */
/* Mobile: 0-639px (default) */
/* Tablet: 640-1023px */
/* Desktop: 1024-1439px */
/* Wide: 1440px+ */