/* ==========================================================================
   BASE - Базовые элементы (контейнеры, секции, кнопки)
   ========================================================================== */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* Main */
.main {
  min-height: calc(100vh - var(--header-height));
  padding-top: var(--header-height);
}

/* Sections */
.section {
  padding: 80px 0;
}

.section--gray {
  background: var(--color-bg);
}

.section--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.section__badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(42, 92, 135, 0.1);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.section__title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.section__subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  max-width: 600px;
}

.section__header {
  text-align: center;
  margin-bottom: 50px;
}

.section__header .section__subtitle {
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   BUTTONS
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

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

.btn--accent:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
}

.btn--white {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn--white:hover {
  background: #f0f0f0;
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn--outline-light {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
}

.btn--lg {
  padding: 16px 32px;
  font-size: 15px;
}

.btn--sm {
  padding: 10px 20px;
  font-size: 13px;
}

.btn--full {
  width: 100%;
}

/* --------------------------------------------------------------------------
   BACK TO TOP
   -------------------------------------------------------------------------- */

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 99;
  box-shadow: var(--shadow-md);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* --------------------------------------------------------------------------
   RESPONSIVE BASE
   -------------------------------------------------------------------------- */

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  
  .section__title {
    font-size: 28px;
  }
  
  .section__subtitle {
    font-size: 16px;
  }
  
  .btn {
    padding: 12px 24px;
  }
  
  .btn--lg {
    padding: 14px 28px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .section {
    padding: 50px 0;
  }
  
  .section__title {
    font-size: 24px;
  }
}