@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

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

/* ===== ОСНОВА ===== */
body {
  font-family: 'Inter', Arial, sans-serif;
  background-color: #0f0f0f;
  color: #eee;
  height: 100vh;
  overflow-x: hidden;
}

/* ===== ХЕДЕР ===== */
header {
  padding: 16px 32px;
  background: #111;
  border-bottom: 1px solid #222;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
}

/* ===== КОНТЕЙНЕР ===== */
.container {
  display: flex;
  height: calc(100vh - 56px);
}

/* ===== САЙДБАР ===== */
.sidebar {
  width: 240px;
  background: #111;
  border-right: 1px solid #222;
  padding: 24px 16px;
  overflow-y: auto;
  font-size: 14px;
  color: #bbb;
}

.sidebar ul {
  list-style: none;
}

/* ===== КНОПКИ ===== */
.sidebar-btn {
  width: 100%;
  background: transparent;
  border: none;
  color: #bbb;
  text-align: left;
  padding: 12px 16px;
  margin-bottom: 6px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.sidebar-btn:hover {
  background-color: #2f2f2f;
  color: #fff;
}

.sidebar-btn.active {
  background-color: #3b3b3b;
  color: #fff;
  font-weight: 600;
}

/* ===== ПОДМАЗДЕЛ ===== */
.submenu {
  list-style: none;
  margin: 6px 0 12px 12px;
  display: none;
}

.submenu.show {
  display: block;
}

.submenu .sidebar-btn {
  font-size: 13px;
  padding: 10px 14px;
  margin-bottom: 4px;
}

/* ===== КОНТЕНТ ===== */
.content {
  flex-grow: 1;
  padding: 40px 48px;
  overflow-y: auto;
}

/* ===== СТРАНИЦЫ ===== */
.page {
  display: none;
}

.page.active {
  display: block;
}

/* ===== ЗАГОЛОВКИ ===== */
h1 {
  font-size: 30px;
  margin-bottom: 32px;
  font-weight: 700;
  color: #fff;
}

h2 {
  font-size: 20px;
  margin-bottom: 16px;
  font-weight: 600;
  color: #fff;
}

/* ===== КАРТОЧКИ ===== */
.card {
  background-color: #111;
  border-radius: 14px;
  border: 1px solid #222;
  padding: 24px 28px;
  margin-bottom: 32px;
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.4);
}

/* ===== ТЕКСТ ===== */
.card p {
  font-size: 15px;
  line-height: 1.7;
  color: #ddd;
  margin-bottom: 14px;
}

.card p:last-child {
  margin-bottom: 0;
}

.card p b {
  font-weight: 600;
}

/* ===== СПИСКИ ===== */
.card ul {
  list-style: none;
  margin-top: 12px;
  margin-bottom: 16px;
}

.card ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  line-height: 1.6;
  color: #ddd;
}

.card ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: #888;
}

/* ===== КОД ===== */
code {
  display: inline-block;
  background: #252525;
  padding: 4px 12px;
  border-radius: 20px;
  font-family: monospace;
  font-size: 14px;
  color: #ccc;
  margin: 4px 0;
}

/* ===== ССЫЛКИ ===== */
a {
  color: #6ca8ff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}