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

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: #f4f6f8;
  color: #1a1a1a;
  line-height: 1.5;
}

a {
  color: #0b57d0;
}

header {
  background: #0b3d91;
  color: #fff;
  padding: 1rem 1.5rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.4rem;
}

header p {
  margin: 0;
  opacity: 0.9;
  font-size: 0.95rem;
}

.layout {
  width: 80%;
  max-width: none;
  margin: 0 auto;
  padding: 1rem;
}

.promo-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  background: #e8f0fe;
  border: 1px solid #c5d9f7;
  border-radius: 10px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.btn-telegram {
  margin-top: 0;
  background: #229ed9;
}

.btn-telegram:hover {
  background: #1a7fb0;
}

nav.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

nav.tabs a {
  text-decoration: none;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: #e8eef7;
  color: #0b3d91;
  font-size: 0.9rem;
}

nav.tabs a.active {
  background: #0b3d91;
  color: #fff;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  margin-bottom: 1rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

label {
  display: block;
  margin: 0.75rem 0 0.25rem;
  font-weight: 600;
  font-size: 0.9rem;
}

input[type="text"],
textarea,
select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: 1px solid #c9d1dc;
  border-radius: 8px;
  font: inherit;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

button,
.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.55rem 1rem;
  border: none;
  border-radius: 8px;
  background: #0b57d0;
  color: #fff;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
}

button:hover,
.btn:hover {
  background: #0842a0;
}

.hint {
  color: #5f6368;
  font-size: 0.85rem;
  margin-top: 0.35rem;
}

.error {
  background: #fdecea;
  color: #b3261e;
  border: 1px solid #f5c2c0;
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.result {
  background: #f8fafc;
  border: 1px solid #dbe3ee;
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1rem;
}

.result pre {
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  font-size: 0.8rem;
  background: #e8f0fe;
  color: #0b57d0;
  margin-bottom: 0.5rem;
}

.marked {
  color: #137333;
  font-weight: 600;
}

.not-marked {
  color: #b3261e;
  font-weight: 600;
}

.item-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
}

.item-list li {
  padding: 0.65rem 0;
  border-top: 1px solid #e3e8ef;
}

.item-list li:first-child {
  border-top: none;
}

footer {
  text-align: center;
  color: #5f6368;
  font-size: 0.85rem;
  padding: 1.5rem 1rem 2rem;
}

.section {
  display: none;
}

.section.active {
  display: block;
}

.inline-form {
  display: inline;
}