:root {
  --primary: hsl(230, 85%, 60%);
  --primary-hover: hsl(230, 85%, 50%);
  --background: hsl(220, 20%, 97%);
  --surface: hsl(0, 0%, 100%);
  --text-main: hsl(220, 20%, 20%);
  --text-muted: hsl(220, 15%, 45%);
  --border: hsl(220, 20%, 90%);
  --radius: 12px;
  --transition: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: hsl(230, 85%, 65%);
    --primary-hover: hsl(230, 85%, 75%);
    --background: hsl(220, 20%, 10%);
    --surface: hsl(220, 20%, 15%);
    --text-main: hsl(0, 0%, 95%);
    --text-muted: hsl(220, 15%, 70%);
    --border: hsl(220, 20%, 25%);
  }
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--background);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary), hsl(280, 85%, 60%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 30px;
  margin-bottom: 15px;
  color: var(--text-main);
}

p {
  margin-bottom: 15px;
  color: var(--text-muted);
}

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

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

.card {
  background-color: var(--surface);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
  margin-bottom: 20px;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.1);
}

.nav-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.nav-card {
  display: block;
  text-align: center;
  padding: 30px 20px;
}

.nav-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: var(--text-main);
}

.nav-card p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

.nav-card:hover {
  text-decoration: none;
  border-color: var(--primary);
}

ul {
  margin-left: 20px;
  margin-bottom: 15px;
  color: var(--text-muted);
}

li {
  margin-bottom: 5px;
}

.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), hsl(280, 85%, 60%));
  color: white !important;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  text-decoration: none;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background-color: var(--background);
  color: var(--text-main);
  font-family: inherit;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  margin-bottom: 20px;
  font-weight: 500;
}

.back-link::before {
  content: "←";
  margin-right: 8px;
}