/* ===== Базовые переменные ===== */
:root {
  --bg: #ffffff;
  --text: #1e1e1e;
  --text-light: #555;
  --accent-dark: #0A2540;
  --accent-bright: #00A3FF;
  --gradient: linear-gradient(120deg, #0A2540, #004E89, #00A3FF, #004E89, #0A2540);
  --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
  --shadow-md: 0 10px 30px rgba(0,0,0,0.06);
  --shadow-lg: 0 20px 50px rgba(0,0,0,0.08);
  --radius: 16px;
  --transition: 0.3s ease;
}

/* ===== Сброс и шрифты ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #ffffff, #f0f7ff, #e6f3ff, #f0f7ff, #ffffff);
  background-size: 400% 400%;
  animation: bgShift 20s ease infinite;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

@keyframes bgShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ===== Вращающееся фоновое изображение (круглое) ===== */
body::after {
  content: "";
  position: fixed;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  width: 30vw;
  height: 30vw;
  border-radius: 50%;
  background: url('../images/background.jpg') no-repeat center center;
  background-size: cover;
  opacity: 0.08;
  z-index: -1;
  animation: spin 50s linear infinite;
  pointer-events: none;
}

@keyframes spin {
  from { transform: translateY(-50%) rotate(0deg); }
  to { transform: translateY(-50%) rotate(360deg); }
}

/* ===== Контейнер ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

/* ===== Навигация ===== */
.navbar {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  padding: 1.2rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-text {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent-dark);
  text-decoration: none;
  transition: color var(--transition);
}

.logo-text:hover {
  color: var(--accent-bright);
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 1rem;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-bright);
  transition: width var(--transition);
}

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

.nav-links a:hover::after {
  width: 100%;
}

/* ===== Герой секция ===== */
.hero {
  padding: 6rem 0 5rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(10,37,64,0.03) 0%, rgba(255,255,255,0) 100%);
  position: relative;
  overflow: hidden;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: var(--gradient);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 2rem;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ===== Стили для логотипа в герой-секции ===== */
.hero-logo {
  flex: 0 0 auto;
  max-width: 350px;
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: white;
  transition: transform 0.3s ease;
}

.hero-logo:hover {
  transform: scale(1.02);
}

.hero-logo img {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0.95;
  animation: hueShift 6s ease infinite;
}

@keyframes hueShift {
  0% { filter: hue-rotate(0deg) brightness(1); }
  50% { filter: hue-rotate(8deg) brightness(1.05); }
  100% { filter: hue-rotate(0deg) brightness(1); }
}

.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  border-radius: 40px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.4s ease;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background: var(--gradient);
  background-size: 200% 200%;
  color: white;
  box-shadow: 0 8px 20px rgba(0,163,255,0.25);
  animation: gradientShift 4s ease infinite;
}

.btn-primary:hover {
  background-position: 100% 100%;
  box-shadow: 0 12px 30px rgba(0,163,255,0.4);
  transform: translateY(-2px);
}

/* ===== Карточки с hover-изображением ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 4rem 0;
}

/* Для десктопа фиксируем 3 колонки, чтобы широкий блок работал */
@media (min-width: 769px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 163, 255, 0.25);
}

/* Широкая карточка для блока на всю ширину */
.card--wide {
  grid-column: span 3;
}

.card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-color: rgba(0, 163, 255, 0.0);
  opacity: 0;
  transform: scale(1.1);
  transition: opacity 0.5s ease, transform 0.5s ease, background-color 0.3s ease;
  z-index: 0;
}

.card:hover .card-bg {
  opacity: 0.5;
  transform: scale(1);
  background-color: rgba(0, 163, 255, 0.12);
}

.card-content {
  position: relative;
  z-index: 1;
  background: rgba(255,255,255,0.92);
  padding: 2.5rem 2rem;
  transition: background 0.3s ease;
}

.card:hover .card-content {
  background: rgba(255,255,255,0.65);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.8rem;
  color: var(--accent-dark);
}

.card p {
  color: var(--text-light);
}

/* ===== Секции ===== */
.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--accent-dark);
  text-align: center;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 3rem;
  text-align: center;
}

/* ===== Контактная форма ===== */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  position: relative;
  margin-bottom: 2.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem 0;
  font-size: 1rem;
  border: none;
  border-bottom: 1px solid #ddd;
  background: transparent;
  outline: none;
  transition: border-color var(--transition);
  color: var(--text);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--accent-bright);
}

.form-group label {
  position: absolute;
  top: 1rem;
  left: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  color: #999;
  font-size: 1rem;
}

.form-group input:focus + label,
.form-group textarea:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:not(:placeholder-shown) + label {
  top: -0.8rem;
  font-size: 0.8rem;
  color: var(--accent-bright);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: transparent;
}

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

.btn-submit {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
  margin-top: 1rem;
}

/* ===== Футер ===== */
.footer {
  background: var(--accent-dark);
  color: rgba(255,255,255,0.8);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.9rem;
}

.footer a {
  color: var(--accent-bright);
  text-decoration: none;
}

/* ===== Центрированный вступительный текст ===== */
.about-intro {
  max-width: 800px;
  margin: 0 auto 3rem;
  text-align: center;
}

.about-intro p {
  margin-bottom: 1.5rem;
  font-size: 1.15rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* ===== Центрирование карточек в сетке (для блоков с малым количеством элементов) ===== */
.cards-grid--centered {
  justify-content: center;
}

/* ===== Адаптивность ===== */
@media (max-width: 768px) {
  .navbar .container {
    flex-direction: column;
    gap: 1rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-logo {
    max-width: 250px;
    margin: 0 auto 2rem;
  }

  body::after {
    display: none;               /* На мобильных скрываем вращающийся фон */
  }

  /* Отменяем фиксированные 3 колонки на мобильных */
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }

  /* Широкая карточка на мобильных ведет себя как обычная */
  .card--wide {
    grid-column: span 1;
  }
}
/* Центрирование двух карточек (Mission/Vision) — отключает принудительную трёхколоночную сетку */
@media (min-width: 769px) {
  .cards-grid--centered {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}