/* Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Be Vietnam Pro', 'Inter', 'Poppins', sans-serif;
  line-height: 1.6;
  color: #1f2937;
  background-color: #ffffff;
}

body.dark-mode {
  color: #f3f4f6;
  background-color: #1f2937;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: #1e3a8a;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #3b82f6;
}

body.dark-mode a {
  color: #60a5fa;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header Styles */
header {
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

body.dark-mode header {
  background-color: #111827;
  border-bottom-color: #374151;
}

/* Footer Styles */
footer {
  background-color: #1f2937;
  color: #f3f4f6;
  padding: 3rem 0 1rem;
  margin-top: 3rem;
  border-top: 1px solid #374151;
}

footer a {
  color: #93c5fd;
}

footer a:hover {
  color: #ffffff;
}

/* Form Styles */
form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #374151;
}

body.dark-mode label {
  color: #e5e7eb;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  transition: all 0.3s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

body.dark-mode input[type="text"],
body.dark-mode input[type="email"],
body.dark-mode input[type="password"],
body.dark-mode input[type="number"],
body.dark-mode textarea,
body.dark-mode select {
  background-color: #374151;
  color: #f3f4f6;
  border-color: #4b5563;
}

/* Button Styles */
button,
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
}

.btn-primary {
  background-color: #1e3a8a;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #1e40af;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
  background-color: #6b7280;
  color: #ffffff;
}

.btn-secondary:hover {
  background-color: #4b5563;
}

.btn-success {
  background-color: #10b981;
  color: #ffffff;
}

.btn-success:hover {
  background-color: #059669;
}

.btn-danger {
  background-color: #ef4444;
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-outline {
  background-color: transparent;
  border: 2px solid #3b82f6;
  color: #3b82f6;
}

.btn-outline:hover {
  background-color: #3b82f6;
  color: #ffffff;
}

/* Card Styles */
.card {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-color: #3b82f6;
}

body.dark-mode .card {
  background-color: #1f2937;
  border-color: #374151;
}

/* Alert Styles */
.alert {
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  border-left: 4px solid;
}

.alert-info {
  background-color: #dbeafe;
  border-color: #0284c7;
  color: #0c4a6e;
}

.alert-success {
  background-color: #dcfce7;
  border-color: #16a34a;
  color: #166534;
}

.alert-warning {
  background-color: #fef3c7;
  border-color: #f59e0b;
  color: #92400e;
}

.alert-danger {
  background-color: #fee2e2;
  border-color: #dc2626;
  color: #991b1b;
}

body.dark-mode .alert-info {
  background-color: #082f49;
  color: #7dd3fc;
}

body.dark-mode .alert-success {
  background-color: #064e3b;
  color: #86efac;
}

body.dark-mode .alert-warning {
  background-color: #78350f;
  color: #fcd34d;
}

body.dark-mode .alert-danger {
  background-color: #7f1d1d;
  color: #fca5a5;
}

/* Spinner/Loading */
.spinner {
  border: 3px solid #e5e7eb;
  border-top: 3px solid #3b82f6;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 1rem auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .container {
    padding: 0 0.75rem;
  }
}

/* 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;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}