:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #1e293b;
  --text-muted: #64748b;
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --accent-soft: #ccfbf1;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Навигация */
.navbar {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

/* Контейнеры контента */
.container {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  flex: 1;
}

.hero {
  text-align: center;
  padding: 3.5rem 1.5rem;
  background: linear-gradient(180deg, var(--accent-soft) 0%, transparent 100%);
  border-radius: 16px;
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto 1.5rem;
}

.btn {
  display: inline-block;
  background-color: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover {
  background-color: var(--accent-hover);
}

/* Сетки карточек */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card h3 {
  color: var(--accent);
  margin-bottom: 0.75rem;
}

/* Акцентные плашки */
.alert-box {
  background-color: #fff1f2;
  border-left: 4px solid #f43f5e;
  padding: 1.25rem;
  border-radius: 4px 8px 8px 4px;
  margin: 2rem 0;
}

.alert-box h4 {
  color: #be123c;
  margin-bottom: 0.5rem;
}

/* Интерактивный тест */
.test-box {
  background: #ffffff;
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  max-width: 750px;
  margin: 0 auto;
}

.question-block {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
}

.question-block:last-of-type {
  border-bottom: none;
}

.question-block p {
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.options label {
  display: block;
  margin-bottom: 0.5rem;
  cursor: pointer;
}

#test-result {
  display: none;
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: 8px;
  background-color: var(--accent-soft);
}

/* Футер */
footer {
  background: #ffffff;
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: auto;
}