/* ============================================================
   Container
   ============================================================ */
.container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* ============================================================
   Section base
   ============================================================ */
.section {
  padding-block: var(--section-padding);
  position: relative;
}

.section--dark {
  background: var(--bg-elevated);
}

.section--gradient {
  background: var(--gradient-primary);
  color: white;
}

.section__title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  font-weight: 700;
  line-height: 1.15;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section__subtitle {
  font-size: var(--font-size-body);
  color: var(--text-secondary);
  text-align: center;
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: 3.5rem;
}

/* ============================================================
   Header
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 100;
  padding-block: 1.25rem;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.header--scrolled {
  background: rgba(8, 8, 8, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.header__logo-img {
  border-radius: 6px;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.header__nav a:not(.btn) {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  letter-spacing: 0.01em;
}

.header__nav a:not(.btn):hover {
  color: var(--text-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: var(--font-size-small);
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition-fast);
}

.btn--primary {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 0 20px rgba(255, 45, 45, 0.25);
}

.btn--primary:hover {
  background: var(--color-accent-light);
  box-shadow: 0 0 30px rgba(255, 45, 45, 0.4);
  transform: translateY(-1px);
}

.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  padding: 0;
}

.header__burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}