#kesson-topbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  min-height: var(--kesson-topbar-height);
  z-index: 60;
  background: linear-gradient(
    to bottom,
    var(--kesson-topbar-bg-start) 0%,
    var(--kesson-topbar-bg-end) 100%
  );
  border-bottom: 1px solid var(--kesson-topbar-border-color);
  box-shadow: 0 10px 24px rgba(0, 0, 0, var(--kesson-topbar-shadow-alpha));
  backdrop-filter: blur(var(--kesson-topbar-blur)) saturate(var(--kesson-topbar-saturate));
  -webkit-backdrop-filter: blur(var(--kesson-topbar-blur)) saturate(var(--kesson-topbar-saturate));
  padding-top: 0;
  padding-bottom: 0;
}

#kesson-topbar .container-fluid {
  min-height: var(--kesson-topbar-height);
}

#kesson-topbar .topbar-brand-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.52rem;
  min-width: 0;
  max-width: calc(100% - 3rem);
  white-space: nowrap;
  overflow: hidden;
  padding: 0.24rem 0;
}

#kesson-topbar .topbar-main-title {
  color: var(--kesson-topbar-title-color);
  font-family: var(--kesson-font-serif-display);
  font-size: var(--kesson-topbar-main-title-size);
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: none;
  margin: 0;
  padding: 0;
  text-decoration: none;
  flex: 0 0 auto;
}

#kesson-topbar .topbar-main-title:hover,
#kesson-topbar .topbar-main-title:focus-visible {
  color: var(--kesson-topbar-title-hover-color);
}

#kesson-topbar .topbar-status-badge {
  font-family: var(--kesson-font-mono-ui);
  font-size: var(--kesson-topbar-credit-size);
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  line-height: 1.1;
  transform: translateY(-1px);
}

#kesson-topbar .topbar-subtitle {
  font-size: var(--kesson-topbar-subtitle-size);
  color: var(--kesson-topbar-subtitle-color);
  letter-spacing: var(--kesson-letter-ui-wide);
  line-height: 1;
  text-transform: none;
  flex: 0 0 auto;
  pointer-events: none;
}

#kesson-topbar .topbar-subtitle::before,
#kesson-topbar .topbar-meta::before {
  content: '·';
  color: var(--kesson-topbar-divider-color);
  margin-right: 0.45rem;
}

#kesson-topbar .topbar-meta {
  display: block;
  flex: 0 0 auto;
  padding: 0;
  font-size: var(--kesson-topbar-meta-size);
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--kesson-topbar-meta-color);
  font-family: var(--kesson-font-serif-ui);
  pointer-events: none;
}

#kesson-topbar .topbar-meta--author {
  font-size: var(--kesson-topbar-meta-author-size);
  color: var(--kesson-topbar-meta-author-color);
}

#kesson-topbar .topbar-link {
  color: var(--kesson-topbar-link-color);
  font-family: var(--kesson-font-mono-ui);
  font-size: var(--kesson-topbar-link-size);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.4rem 0.72rem;
  border-radius: 999px;
  transition: color 0.25s ease, background-color 0.25s ease;
}

#kesson-topbar .topbar-link:hover,
#kesson-topbar .topbar-link:focus-visible {
  color: var(--kesson-topbar-link-hover-color);
  background: var(--kesson-topbar-link-hover-bg);
}

#kesson-topbar .topbar-link-btn {
  border: 0;
  background: transparent;
  line-height: inherit;
  width: 100%;
  text-align: left;
}

#kesson-topbar .topbar-lang-btn {
  color: var(--kesson-topbar-lang-color);
  border: 1px solid var(--kesson-topbar-lang-border);
  background: var(--kesson-topbar-lang-bg);
}

#kesson-topbar .topbar-collab-item {
  margin-left: 0.45rem;
  padding-left: 0.55rem;
  border-left: 1px solid var(--kesson-topbar-note-divider-color);
}

#kesson-topbar .topbar-collab-note {
  display: inline-block;
  font-family: var(--kesson-font-serif-ui);
  font-size: var(--kesson-topbar-note-size);
  line-height: 1;
  letter-spacing: var(--kesson-letter-ui-normal);
  color: var(--kesson-topbar-note-color);
  white-space: nowrap;
  margin-left: 0.5rem;
  padding-left: 0.56rem;
  border-left: 1px solid var(--kesson-topbar-note-divider-color);
  min-width: 0;
  max-width: min(42vw, 18rem);
  overflow: hidden;
  text-overflow: ellipsis;
  pointer-events: none;
  user-select: none;
}

.topbar-font-size-ctrl {
  opacity: 0.75;
}

.topbar-font-btn {
  font-family: var(--kesson-font-mono-ui);
  font-size: var(--kesson-topbar-credit-size, 0.80rem);
  letter-spacing: 0.08em;
  padding: 0.2rem 0.5rem;
  background: transparent;
  border: 1px solid var(--kesson-topbar-nav-border);
  color: var(--kesson-topbar-link-color);
  line-height: 1.4;
}

.topbar-font-btn:hover:not(:disabled) {
  background: var(--kesson-topbar-link-hover-bg);
  color: var(--kesson-topbar-link-hover-color);
}

.topbar-font-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

#kesson-topbar .topbar-toggler {
  border-color: var(--kesson-topbar-toggler-border);
  padding: 0.18rem 0.44rem;
}

#kesson-topbar .topbar-toggler:focus {
  box-shadow: 0 0 0 0.14rem var(--kesson-topbar-toggler-focus);
}

#kessonTopbarNav {
  margin-top: 0.35rem;
  padding: 0.35rem 0.2rem 0.5rem;
  border-radius: 0.6rem;
  background: var(--kesson-topbar-nav-bg);
  border: 1px solid var(--kesson-topbar-nav-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@media (min-width: 768px) {
  #kessonTopbarNav {
    margin-top: 0;
    padding: 0;
    background: transparent;
    border: 0;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  #kesson-topbar .topbar-link-btn {
    width: auto;
    text-align: center;
  }

  #kesson-topbar .topbar-lang-item {
    margin-left: 0.35rem;
  }
}

@media (max-width: 991.98px) {
  #kesson-topbar .topbar-meta--author {
    display: none;
  }

  #kesson-topbar .topbar-subtitle {
    font-size: var(--kesson-topbar-subtitle-size-md);
  }
}

@media (max-width: 767.98px) {
  #kesson-topbar .topbar-subtitle {
    display: none;
  }

  #kesson-topbar .topbar-main-title {
    font-size: var(--kesson-topbar-main-title-size-sm);
  }

  #kesson-topbar .topbar-collab-note {
    font-size: var(--kesson-topbar-credit-size);
    letter-spacing: 0.05em;
    margin-left: 0.36rem;
    padding-left: 0.36rem;
    max-width: min(40vw, 9.8rem);
  }

  #kesson-topbar .topbar-status-badge {
    font-size: 0.80rem;
    padding: 0.16rem 0.42rem;
  }
}