:root {
  --sidebar-width: 280px;
  --header-height: 56px;
  --bg: #f4f6fb;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #1f2933;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --danger: #b91c1c;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

a {
  color: inherit;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  text-decoration: none;
}

.menu-toggle {
    position: relative;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 0;
    background: transparent;
    cursor: pointer;
}

/* Средняя полоска */
.menu-toggle span {
    position: absolute;
    left: 8px;
    top: 50%;
    width: 24px;
    height: 2px;
    background: #000;
    transform: translateY(-50%);
    transition: 0.25s;
}

/* Верхняя и нижняя полоски */
.menu-toggle::before,
.menu-toggle::after {
    content: "";
    position: absolute;
    left: 8px;
    width: 24px;
    height: 2px;
    background: #000;
    transition: 0.25s;
}

.menu-toggle::before {
    top: 11px;
}

.menu-toggle::after {
    bottom: 11px;
}
.menu-toggle.is-open span {
    opacity: 0;
}

.menu-toggle.is-open::before {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
}

.menu-toggle.is-open::after {
    bottom: auto;
    top: 50%;
    transform: translateY(-50%) rotate(-45deg);
}
.menu-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 1;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 68px 16px 16px;
  transform: translateX(-100%);
  transition: transform 0.18s ease;
  z-index: 50;
}

body.sidebar-open .sidebar {
  transform: none;
}

.content {
  min-height: calc(100vh - var(--header-height));
  padding: 24px;
}

.page-container {
  width: min(980px, 100%);
  margin: 0 auto;
}

.sidebar-close {
  position: absolute;
  top: 16px;
  right: 16px;
}

.menu-category {
  margin: 0 0 18px;
}

.menu-category h2 {
  margin: 0 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.menu-link {
  display: block;
  padding: 8px 10px;
  margin: 2px 0;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
}

.menu-link:hover {
  background: #eef2ff;
}

.menu-link.active {
  background: #e0e7ff;
  color: var(--primary-dark);
  font-weight: 600;
}

.card {
  max-width: 980px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.card h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.card h2 {
  margin: 24px 0 8px;
  font-size: 18px;
}

.muted {
  color: var(--muted);
}

.tool-form {
  display: grid;
  gap: 16px;
}

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-weight: 600;
  font-size: 14px;
}

input,
select,
textarea,
button {
  font: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  width:  100%;
}

input,
select {
  padding: 9px 10px;
}

input[type="checkbox"]{
  width:  auto;
}

textarea {
  min-height: 150px;
  padding: 10px;
  resize: vertical;
}

button {
  cursor: pointer;
  width:  auto;
}

button.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  padding: 10px 14px;
  font-weight: 600;
}

button.primary:hover {
  background: var(--primary-dark);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result {
  margin: 0;
  padding: 12px;
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  background: #f8fafc;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.result-container {
  display: grid;
  gap: 8px;
}

.copy-result {
  justify-self: start;
  padding: 8px 12px;
}

.error {
  margin: 0;
  color: var(--danger);
  font-weight: 600;
}

@media (max-width: 899px) {
  .content {
    padding: 16px;
  }
}