:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2533;
  --muted: #596176;
  --line: #d9dfea;
  --link: #2f67ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8f9fc 0%, #eef2fb 100%);
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 2px 10px rgba(22, 35, 62, 0.05);
}

h1 {
  margin-top: 0;
  font-size: 1.8rem;
}

h2 {
  margin-top: 28px;
  font-size: 1.1rem;
}

p, li {
  color: var(--text);
  line-height: 1.7;
}

small, .meta {
  color: var(--muted);
}

nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

nav a, .btn {
  display: inline-block;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--text);
  background: #fff;
}

nav a:hover, .btn:hover {
  border-color: #b9c7e8;
  background: #f7f9ff;
}

a {
  color: var(--link);
}

footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 0.92rem;
}

ul {
  padding-left: 20px;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: var(--card);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--link);
}

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

.required {
  color: #e53e3e;
}

.submit-btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--link);
  color: #fff;
  border: none;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.submit-btn:hover {
  opacity: 0.85;
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.message {
  margin-top: 16px;
  padding: 16px;
  border-radius: 10px;
}

.message.success {
  background: #f0fdf4;
  border: 1px solid #86efac;
  color: #166534;
}

.message.error {
  background: #fef2f2;
  border: 1px solid #fca5a5;
  color: #991b1b;
}

@media (max-width: 640px) {
  .card {
    padding: 18px;
  }

  h1 {
    font-size: 1.5rem;
  }
}