/**
 * Wcargoplus Frontend Stylesheet
 * Modern, Minimalist, and Accessible Design
 * Mobile-First Responsive | WCAG 2.1 AA Compliant
 * Version: 6.0.0 - Optimized & Consolidated
 */

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

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-secondary);
  background-color: var(--bg-body);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  overflow-y: auto;
}

main {
  display: block;
}

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

.skip-to-content {
  position: absolute;
  top: -48px;
  left: var(--spacing-4);
  background-color: var(--wcargoplus-primary);
  color: var(--text-white);
  padding: var(--spacing-3) var(--spacing-6);
  text-decoration: none;
  z-index: var(--z-modal);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  transition: top var(--transition-fast);
  box-shadow: var(--shadow-lg);
}

.skip-to-content:focus {
  top: var(--spacing-4);
  outline: 3px solid var(--wcargoplus-primary-dark);
  outline-offset: 2px;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--wcargoplus-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-4) 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  word-break: break-word;
}

h1 { 
  font-size: clamp(2rem, 5vw, var(--font-size-4xl)); 
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
}

h2 { 
  font-size: clamp(1.75rem, 4vw, var(--font-size-3xl)); 
  letter-spacing: -0.01em;
}

h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin: 0 0 var(--spacing-4) 0;
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
}

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

a:hover {
  color: var(--wcargoplus-primary-dark);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--wcargoplus-primary);
  outline-offset: 3px;
  text-decoration: underline;
}

.lead {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
}

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

header {
  background-color: var(--bg-body);
  border-bottom: 1px solid var(--border-color-light);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: box-shadow var(--transition-base);
}

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

.navbar {
  background-color: var(--bg-body);
  padding: var(--spacing-3) 0;
  position: relative;
}

.navbar-brand {
  font-weight: var(--font-weight-bold);
  color: var(--wcargoplus-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  white-space: nowrap;
  transition: transform var(--transition-fast);
}

.navbar-brand:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.navbar-brand:focus-visible {
  outline: 2px solid var(--wcargoplus-primary);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.navbar-brand img {
  height: 32px;
  width: auto;
  max-width: 140px;
  object-fit: contain;
  transition: opacity var(--transition-fast);
}

.navbar-brand:hover img {
  opacity: 0.9;
}

.navbar-toggler {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-2);
  background-color: transparent;
  transition: all var(--transition-fast);
}

.navbar-toggler:hover {
  background-color: var(--bg-light);
  border-color: var(--wcargoplus-primary);
}

.navbar-toggler:focus {
  outline: 2px solid var(--wcargoplus-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(10, 191, 83, 0.15);
}

.navbar-nav {
  gap: var(--spacing-1);
}

.navbar-nav .nav-link {
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-md);
  margin: 0;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  position: relative;
  white-space: nowrap;
}

.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--wcargoplus-primary);
  transition: all var(--transition-base);
  transform: translateX(-50%);
}

.navbar-nav .nav-link:hover {
  background-color: rgba(10, 191, 83, 0.08);
  color: var(--wcargoplus-primary);
  text-decoration: none;
}

.navbar-nav .nav-link:hover::after {
  width: 80%;
}

.navbar-nav .nav-link.active {
  color: var(--wcargoplus-primary);
  background-color: rgba(10, 191, 83, 0.1);
  font-weight: var(--font-weight-semibold);
}

.navbar-nav .nav-link:focus-visible {
  outline: 2px solid var(--wcargoplus-primary);
  outline-offset: 2px;
  background-color: rgba(10, 191, 83, 0.05);
}

/* ========================================
   DROPDOWN MENUS
   ======================================== */

.dropdown-menu {
  border: 1px solid var(--border-color-light);
  box-shadow: var(--shadow-xl);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2);
  margin-top: var(--spacing-2);
  background-color: var(--bg-body);
  min-width: 220px;
  animation: fadeInDown 0.2s ease-out;
}

.dropdown-header {
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-2);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dropdown-item {
  color: var(--text-primary);
  background-color: transparent;
  padding: var(--spacing-3) var(--spacing-4);
  transition: all var(--transition-fast);
  border-radius: var(--radius-md);
  margin: var(--spacing-1) 0;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  position: relative;
}

.dropdown-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background-color: var(--wcargoplus-primary);
  transition: height var(--transition-fast);
  transform: translateY(-50%);
}

.dropdown-item:hover {
  background-color: var(--bg-light);
  color: var(--wcargoplus-primary);
  padding-left: calc(var(--spacing-4) + 4px);
}

.dropdown-item:hover::before {
  height: 70%;
}

.dropdown-item:focus {
  background-color: var(--bg-lighter);
  color: var(--text-primary);
  outline: 2px solid var(--wcargoplus-primary);
  outline-offset: -2px;
}

.dropdown-item:active {
  background-color: rgba(10, 191, 83, 0.15);
  color: var(--wcargoplus-primary);
}

.dropdown-divider {
  margin: var(--spacing-2) 0;
  opacity: 0.5;
  border-color: var(--border-color);
}

/* ========================================
   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: var(--font-weight-semibold);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  gap: var(--spacing-2);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn:focus-visible {
  outline: 3px solid var(--wcargoplus-primary);
  outline-offset: 2px;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

.btn-primary {
  color: var(--text-white);
  background: linear-gradient(135deg, var(--wcargoplus-primary) 0%, var(--wcargoplus-primary-dark) 100%);
  border-color: var(--wcargoplus-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--wcargoplus-primary-dark) 0%, var(--wcargoplus-primary) 100%);
  color: var(--text-white);
  box-shadow: var(--shadow-lg);
}

.btn-outline-primary {
  color: var(--wcargoplus-primary);
  background-color: transparent;
  border-color: var(--wcargoplus-primary);
  border-width: 1.5px;
}

.btn-outline-primary:hover {
  color: var(--text-white);
  background-color: var(--wcargoplus-primary);
  border-color: var(--wcargoplus-primary);
}

.btn-link {
  color: var(--wcargoplus-primary);
  background-color: transparent;
  border: none;
  text-decoration: none;
  padding: var(--spacing-2) var(--spacing-3);
  box-shadow: none;
}

.btn-link:hover {
  color: var(--wcargoplus-primary-dark);
  background-color: rgba(10, 191, 83, 0.05);
  transform: none;
  box-shadow: none;
}

.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

/* ========================================
   CARDS
   ======================================== */

.card {
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--wcargoplus-primary);
}

.card-header {
  padding: var(--spacing-6);
  background-color: var(--bg-light);
  border-bottom: 1px solid var(--border-color);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.card-body {
  padding: var(--spacing-6);
}

.card-footer {
  padding: var(--spacing-6);
  background-color: var(--bg-light);
  border-top: 1px solid var(--border-color);
}

/* ========================================
    FORMS
    ======================================== */

.form-control,
.form-select {
  display: block;
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.form-control:hover,
.form-select:hover {
  border-color: var(--border-color-dark);
}

.form-control:focus,
.form-select:focus {
  color: var(--text-primary);
  background-color: var(--bg-body);
  border-color: var(--wcargoplus-primary);
  outline: 0;
  box-shadow: 0 0 0 3px rgba(10, 191, 83, 0.15);
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form-text {
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ========================================
    FORM VALIDATION
    ======================================== */

/* Error input styling */
.input-error {
  border-color: #dc3545 !important;
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25) !important;
}

.input-error:focus {
  border-color: #dc3545 !important;
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25) !important;
}

/* Form group error lists (direct ul/li in form groups) - hide direct ul to avoid duplication */
.form-group > ul {
  display: none;
}

.form-group ul {
  margin: var(--spacing-1) 0 0 0;
  padding-left: 0;
  list-style-type: none;
  color: #dc3545;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
}

.form-group li {
  margin-bottom: var(--spacing-1);
  line-height: var(--line-height-normal);
}

/* Invalid feedback styling */
.invalid-feedback {
  display: block;
  width: 100%;
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
  color: #dc3545;
  font-weight: var(--font-weight-normal);
}

.invalid-feedback small {
  color: #dc3545;
  font-size: inherit;
}

.invalid-feedback ul {
  margin: 0;
  padding-left: 0;
  list-style-type: none;
}

.invalid-feedback li {
  margin-bottom: var(--spacing-1);
  line-height: var(--line-height-normal);
}

/* Help block styling (alternative error display) */
.help-block {
  display: block;
  width: 100%;
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
  color: #dc3545;
  font-weight: var(--font-weight-normal);
}

.help-block small {
  color: #dc3545;
  font-size: inherit;
}

.help-block ul {
  margin: 0;
  padding-left: 0;
  list-style-type: none;
}

.help-block li {
  margin-bottom: var(--spacing-1);
  line-height: var(--line-height-normal);
}

/* ========================================
   MAIN CONTENT
   ======================================== */

.main-content {
  position: relative;
  z-index: 1;
  padding: var(--spacing-6) var(--spacing-4);
  background-color: var(--bg-body);
  min-height: 60vh;
}

/* ========================================
   BACK TO TOP BUTTON
   ======================================== */

.back-to-top {
  position: fixed;
  bottom: calc(var(--spacing-8) + 4rem);
  right: var(--spacing-8);
  width: 3.5rem;
  height: 3.5rem;
  background: linear-gradient(135deg, var(--wcargoplus-primary), var(--wcargoplus-primary-dark));
  color: var(--text-white);
  border: none;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 9999;
  box-shadow: 0 4px 12px rgba(10, 191, 83, 0.3);
  text-decoration: none;
}

.back-to-top:hover {
  background: linear-gradient(135deg, var(--wcargoplus-primary-dark), var(--wcargoplus-primary));
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(10, 191, 83, 0.4);
  color: var(--text-white);
}

.back-to-top:focus-visible {
  outline: 3px solid var(--wcargoplus-primary-dark);
  outline-offset: 3px;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top i {
  font-size: 1.25rem;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeInDown {
  0% {
    opacity: 0;
    transform: translate3d(0, -10px, 0);
  }
  100% {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   RESPONSIVE DESIGN (Mobile-First)
   ======================================== */

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) {
  .main-content {
    padding: var(--spacing-8);
  }
  
  .navbar {
    padding: var(--spacing-3) 0;
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) {
  .main-content {
    padding: var(--spacing-10) var(--spacing-8);
  }
  
  .navbar-nav {
    gap: var(--spacing-2);
  }
  
  .navbar-brand img {
    height: 36px;
  }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
  .dropdown-menu {
    min-width: 240px;
  }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .main-content {
    padding: var(--spacing-12) var(--spacing-16);
  }
}

/* ========================================
   MOBILE OPTIMIZATIONS
   ======================================== */

@media (max-width: 767.98px) {
  .navbar-nav {
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-color-light);
    margin-top: var(--spacing-4);
  }
  
  .nav-item {
    margin-bottom: var(--spacing-1);
  }
  
  .navbar-nav .nav-link {
    padding: var(--spacing-3) var(--spacing-4);
  }
  
  .dropdown-menu {
    border: none;
    box-shadow: none;
    background-color: var(--bg-lighter);
    margin-left: var(--spacing-4);
    margin-right: 0;
    margin-top: var(--spacing-2);
    padding: var(--spacing-2);
  }
  
  .btn-sm {
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-sm);
  }
  
  .back-to-top {
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    width: 3rem;
    height: 3rem;
  }
  
  .back-to-top i {
    font-size: 1rem;
  }
}

/* ========================================
   ACCESSIBILITY - HIGH CONTRAST MODE
   ======================================== */

@media (prefers-contrast: high) {
  header {
    border-bottom-width: 2px;
  }
  
  .navbar {
    border-bottom-width: 2px;
  }
  
  .dropdown-menu,
  .card,
  .form-control,
  .form-select {
    border-width: 2px;
  }
  
  .btn {
    border-width: 2px;
  }
  
  .btn:focus-visible,
  a:focus-visible,
  *:focus-visible {
    outline-width: 3px;
  }
}

/* ========================================
   ACCESSIBILITY - REDUCED MOTION
   ======================================== */

@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;
  }
  
  .btn:hover {
    transform: none;
  }
  
  .card:hover {
    transform: none;
  }
  
  .back-to-top:hover {
    transform: none;
  }
}

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

@media print {
  header,
  .back-to-top,
  nav,
  .navbar-toggler,
  .btn {
    display: none !important;
  }
  
  body {
    background-color: white;
    color: black;
  }
  
  a {
    text-decoration: underline;
    color: black;
  }
  
  .main-content {
    padding: 0;
  }
  
  * {
    box-shadow: none !important;
  }
}