:root {
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

body.nav-open,
body.lightbox-open {
  overflow: hidden;
}

.theme-btn {
  min-width: 88px;
  text-align: center;
}

.nav-links a.is-current {
  color: var(--text) !important;
}

.nav-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--transition), transform var(--transition), color var(--transition);
}

.nav-menu-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.nav-menu-btn span {
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-menu-btn.is-open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-menu-btn.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-menu-btn.is-open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 11, 16, 0.6);
  backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 120;
}

.nav-drawer-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.nav-drawer {
  position: fixed;
  top: 72px;
  right: 1rem;
  width: min(280px, calc(100vw - 2rem));
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.012)),
    var(--surface);
  box-shadow: 0 24px 60px rgba(3, 8, 15, 0.34);
  transform: translateY(-10px) scale(0.98);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition), opacity var(--transition);
  z-index: 130;
}

.nav-drawer.is-open {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: auto;
}

.nav-drawer .nav-links {
  display: flex !important;
  flex-direction: column;
  align-items: stretch;
  gap: 0.25rem;
}

.nav-drawer .nav-links li {
  width: 100%;
}

.nav-drawer .nav-links a {
  display: block;
  width: 100%;
  padding: 0.75rem 0.25rem;
  color: var(--text);
}

.hero-tag.is-live::after {
  content: "_";
  margin-left: 0.2rem;
  animation: cursor-blink 1s step-end infinite;
}

.profile-card.is-tilt-ready {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 180ms ease;
}

.profile-card.is-tilt-ready .profile-card-inner {
  transition: border-color var(--transition), box-shadow var(--transition);
}

.profile-card.is-tilt-ready:hover .profile-card-inner {
  border-color: var(--accent);
  box-shadow: 0 20px 40px rgba(3, 8, 15, 0.24);
}

.blog-toolbar {
  padding: 1.5rem 6vw 0;
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
}

.blog-search {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.blog-search-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text3);
}

.blog-search input {
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.008)), var(--surface);
  color: var(--text);
  font: inherit;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.blog-search input::placeholder {
  color: var(--text3);
}

.blog-search input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.14);
  transform: translateY(-1px);
}

.blog-search-note {
  max-width: 26rem;
  font-size: 0.85rem;
  color: var(--text2);
}

.post-card.is-hidden,
.post-featured.is-hidden {
  display: none !important;
}

.posts-empty {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border: 1px dashed var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
}

.posts-empty-title {
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.posts-empty p {
  margin: 0;
  color: var(--text2);
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 180;
  pointer-events: none;
}

.reading-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform-origin: left center;
  transform: scaleX(0);
  background: var(--accent);
  box-shadow: none;
}

.toc a {
  display: block;
  padding-left: 0.6rem;
  border-left: 2px solid transparent;
}

.toc a.is-active {
  color: var(--text);
  border-left-color: var(--accent);
}

.copy-btn.is-copied {
  color: var(--success);
}

.image-lightbox {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: rgba(6, 10, 16, 0.86);
  backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 200;
}

.image-lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}

.image-lightbox-panel {
  width: min(1100px, 100%);
  display: grid;
  gap: 0.75rem;
}

.image-lightbox-close {
  justify-self: end;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text2);
  font-family: var(--mono);
  font-size: 0.72rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.image-lightbox-close:hover {
  border-color: var(--accent);
  color: var(--text);
}

.image-lightbox-image {
  width: 100%;
  max-height: calc(100vh - 8rem);
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}

.image-lightbox-caption {
  color: var(--text2);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.7;
}

@keyframes cursor-blink {
  50% {
    opacity: 0;
  }
}

@media (max-width: 768px) {
  .nav-menu-btn {
    display: inline-flex;
  }

  .nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }

  .blog-toolbar {
    grid-template-columns: 1fr;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-tag.is-live::after {
    animation: none;
  }

  .nav-drawer-backdrop,
  .nav-drawer,
  .nav-menu-btn,
  .blog-search input,
  body.site-page .btn,
  body.site-page .post-card,
  .cert-card,
  .cert-panel-shell,
  .cert-panel-content {
    transition: none;
  }
}