:root {
  --primary: #041E42;
  --primary-light: #0d3266;
  --secondary: #00e5ff;
  --secondary-dark: #00b8cc;
  --background: #f8fafc;
  --surface: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--background);
  color: var(--text-main);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header & Navbar */
.header {
  background-color: var(--primary);
  color: white;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: #cbd5e1;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: white;
}

/* Menu Mobile */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Main Content */
.main-content {
  flex: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--primary);
  line-height: 1.2;
}

h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

input, textarea, select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(4, 30, 66, 0.1);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background-color: var(--secondary);
  color: var(--primary);
}

.btn-primary:hover {
  background-color: var(--secondary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--primary-light);
  color: white;
}

.btn-secondary:hover {
  background-color: var(--primary);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.card {
  background-color: var(--surface);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card-icon {
  font-size: 2.5rem;
  color: var(--secondary-dark);
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

/* Tools Output Area */
.output-area {
  background-color: #1e293b;
  color: #f8fafc;
  padding: 1.5rem;
  border-radius: 0.5rem;
  font-family: 'Courier New', Courier, monospace;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 1.5rem;
  min-height: 100px;
}

/* Footer */
.footer {
  background-color: var(--primary);
  color: #cbd5e1;
  padding: 4rem 2rem 2rem;
  margin-top: auto;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-link {
  color: #cbd5e1;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover {
  color: white;
}

.donation-box {
  background-color: rgba(255, 255, 255, 0.05);
  padding: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.donation-btn {
  display: inline-block;
  background-color: #0070ba;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  text-decoration: none;
  font-weight: 600;
  margin-top: 1rem;
  transition: background-color 0.2s;
}

.donation-btn:hover {
  background-color: #005ea6;
}

/* Utilities */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.d-flex { display: flex; }
.gap-4 { gap: 1rem; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--primary);
    flex-direction: column;
    padding: 1rem 2rem;
    gap: 1rem;
  }
  
  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
}