:root {
  --mermaid-control-size: 1.9rem;
  --mermaid-control-icon-size: 0.85rem;
  --mermaid-control-size-mobile: 1.75rem;
  --mermaid-lightbox-close-size: 2.35rem;
  --mermaid-lightbox-close-size-mobile: 2.15rem;
}

.post-content .mermaid {
  position: relative;
  margin: 1.5rem 0;
  padding: 1rem;
  border: 1px solid rgba(17, 24, 39, 0.12);
  border-radius: 16px;
  background:
    radial-gradient(circle at top left, rgba(236, 254, 255, 0.9), transparent 42%),
    linear-gradient(180deg, rgba(249, 250, 251, 0.96), rgba(255, 255, 255, 0.98));
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.06);
  overflow: hidden;
  cursor: zoom-in;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

.post-content .mermaid__viewport {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-gutter: stable both-edges;
}

.post-content .mermaid svg {
  display: block;
  width: auto;
  max-width: none;
  height: auto;
  margin: 0 auto;
}

.post-content .mermaid::after {
  content: "";
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: var(--mermaid-control-size);
  height: var(--mermaid-control-size);
  border: 1px solid rgba(17, 24, 39, 0.08);
  border-radius: 999px;
  background-color: rgba(255, 255, 255, 0.82);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23111827' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M15 3h6v6'/%3E%3Cpath d='M9 21H3v-6'/%3E%3Cpath d='M21 3l-7 7'/%3E%3Cpath d='M3 21l7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: var(--mermaid-control-icon-size) var(--mermaid-control-icon-size);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
  opacity: 0.72;
  pointer-events: none;
  transition:
    opacity 160ms ease,
    transform 160ms ease,
    background-color 160ms ease;
}

.post-content .mermaid:hover,
.post-content .mermaid:focus-visible {
  border-color: rgba(14, 165, 233, 0.24);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.09);
}

.post-content .mermaid:hover::after,
.post-content .mermaid:focus-visible::after {
  opacity: 1;
  transform: scale(1.04);
  background-color: rgba(255, 255, 255, 0.96);
}

.post-content .mermaid:focus-visible {
  outline: 3px solid rgba(14, 165, 233, 0.55);
  outline-offset: 3px;
}

body.mermaid-lightbox-open {
  overflow: hidden;
}

.mermaid-lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(8px);
}

.mermaid-lightbox__panel {
  width: min(1200px, 100%);
  max-height: min(90vh, 980px);
  position: relative;
  overflow: hidden;
  padding: 1rem;
  border-radius: 22px;
  background:
    radial-gradient(circle at top left, rgba(236, 254, 255, 0.92), transparent 38%),
    linear-gradient(180deg, rgba(249, 250, 251, 0.98), rgba(255, 255, 255, 1));
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.28);
}

.mermaid-lightbox__close {
  position: absolute;
  top: 0.9rem;
  right: 0.9rem;
  z-index: 1;
  width: var(--mermaid-lightbox-close-size);
  height: var(--mermaid-lightbox-close-size);
  border: 1px solid rgba(17, 24, 39, 0.08);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.12);
  cursor: pointer;
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease;
}

.mermaid-lightbox__close::before {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: var(--mermaid-control-icon-size);
  height: var(--mermaid-control-icon-size);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23111827' stroke-width='2.1' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 6 6 18'/%3E%3Cpath d='m6 6 12 12'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.mermaid-lightbox__close:hover,
.mermaid-lightbox__close:focus-visible {
  background: rgba(255, 255, 255, 1);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.16);
  transform: scale(1.04);
}

.mermaid-lightbox__content {
  overflow: auto;
  max-height: calc(90vh - 2rem);
  border-radius: 16px;
}

.mermaid-lightbox__stage {
  width: fit-content;
  min-width: 100%;
  margin: 0 auto;
}

.mermaid-lightbox__content svg {
  display: block;
  width: auto;
  max-width: none;
  height: auto;
  margin: 0 auto;
}

@media (max-width: 700px) {
  :root {
    --mermaid-control-size: var(--mermaid-control-size-mobile);
    --mermaid-lightbox-close-size: var(--mermaid-lightbox-close-size-mobile);
  }

  .post-content .mermaid {
    margin: 1.25rem -0.25rem;
    padding: 0.85rem;
    border-radius: 14px;
  }

  .post-content .mermaid::after {
    top: 0.6rem;
    right: 0.6rem;
  }

  .mermaid-lightbox {
    padding: 1rem;
  }

  .mermaid-lightbox__panel {
    max-height: 92vh;
    padding: 0.85rem;
    border-radius: 18px;
  }

  .mermaid-lightbox__close {
    top: 0.7rem;
    right: 0.7rem;
  }

  .mermaid-lightbox__content {
    max-height: calc(92vh - 1.7rem);
  }

  .mermaid-lightbox__stage {
    min-width: max-content;
  }
}