:root {
  --bg: #f8fafc;
  --bg-elevated: #ffffff;
  --accent: #4a5568;
  --accent-soft: rgba(74, 85, 104, 0.16);
  --text: #0f172a;
  --text-muted: #55607a;
  --border-subtle: rgba(15, 23, 42, 0.08);
  --font-main: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --shadow-soft: 0 24px 70px rgba(15, 23, 42, 0.12);
  --content-max-width: 1400px;
  --content-padding: 1.9rem;
  --content-padding-mobile: 1.1rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-main);
  background: radial-gradient(120% 120% at 20% 20%, rgba(74, 85, 104, 0.08), transparent 50%),
    radial-gradient(140% 140% at 80% 10%, rgba(107, 114, 128, 0.06), transparent 52%),
    linear-gradient(180deg, #f9fafa 0%, #eef1f4 100%);
  color: var(--text);
  line-height: 1.6;
}

/* Layout */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: calc(var(--content-max-width) + 2 * var(--content-padding));
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.branding {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.site-title {
  margin: 0;
  font-size: 2.2rem;
  letter-spacing: 0.02em;
}

.site-tagline {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.site-nav {
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links button {
  border: 1px solid transparent;
  background: rgba(0, 0, 0, 0.02);
  color: var(--text-muted);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-pill);
  font-size: 1.05rem;
  cursor: pointer;
  transition:
    background 160ms ease,
    color 160ms ease,
    border-color 160ms ease,
    transform 80ms ease;
}

.nav-links button:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text);
  border-color: var(--border-subtle);
}

.nav-links button[aria-current="page"] {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  transform: translateY(-1px);
}

.sub-nav-links button[aria-current="page"] {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.15);
}

.sub-nav {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 0 auto 1rem;
  max-width: var(--content-max-width);
}

.sub-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 1rem;
}

.sub-nav-title {
  font-weight: 700;
  font-size: 2rem;
  color: var(--text);
  white-space: nowrap;
}

.sub-nav-links {
  background: transparent;
  padding: 0;
  border-radius: 0;
  border: none;
  box-shadow: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem;
  overflow-x: visible;
}

.sub-nav-links button {
  font-size: clamp(1rem, 1.6vw, 2rem);
  padding: clamp(0.6rem, 1.2vw, 0.9rem) clamp(0.9rem, 1.4vw, 1.6rem);
  font-weight: 700;
  border-radius: 18px;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);
  flex: 0 1 auto;
  min-width: 0;
  white-space: nowrap;
}

.sub-nav[hidden] {
  display: none;
}

/* Main content */

.site-main {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--content-padding);
}

.content-inner {
  background: linear-gradient(180deg, #ffffff 0%, #f6f8fb 100%);
  border-radius: 26px;
  padding: var(--content-padding) var(--content-padding) 2rem;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border-subtle);
  min-height: 50vh;
}

.content-inner > * + * {
  margin-top: 1.4rem;
}

.content-inner h1,
.content-inner h2,
.content-inner h3 {
  color: var(--text);
  background: linear-gradient(180deg, #ffffff 0%, #f1f4fb 100%);
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 16px;
  padding: 1.4rem 1.6rem;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.12);
  margin-top: 1.4rem;
  margin-bottom: 1.1rem;
  scroll-margin-top: 90px;
}

.content-inner h1 {
  font-size: 3.4rem;
  margin-top: 0.4rem;
}

.content-inner h2 {
  font-size: 2.4rem;
  margin-top: 2rem;
}

.content-inner h3 {
  font-size: 1.8rem;
  margin-top: 1.4rem;
  color: var(--text);
  background: linear-gradient(135deg, #f5f5f7 0%, #e8ebf1 50%, #f9fafc 100%);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.content-inner p {
  margin-top: 0.4rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.content-inner ul {
  padding-left: 1.2rem;
  margin-top: 0.3rem;
  margin-bottom: 0.7rem;
}

.content-inner li {
  margin-bottom: 0.2rem;
}

.content-inner a {
  position: relative;
  color: #0a66c2;
  text-decoration: none;
  font-weight: 600;
  padding-right: 0.4rem;
}

.content-inner a:hover {
  text-decoration: underline;
}

.content-inner a::after {
  content: "↗";
  position: absolute;
  right: -0.35rem;
  top: 0;
  font-size: 0.8em;
  color: currentColor;
}

.loading-message,
.error-message {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.error-message {
  color: #c11d1d;
}

strong,
b {
  font-weight: 600;
  color: var(--text);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  margin-top: 1rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Utilities */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.15rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.meta-line {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.content-image {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 0.6rem 0 1.1rem;
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  background: var(--bg-elevated);
  object-fit: cover;
}

.content-video {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  background: var(--bg-elevated);
}

.content-video.easter-clickable,
.content-image.easter-clickable {
  cursor: pointer;
}

.content-video.easter-clickable:focus-visible,
.content-image.easter-clickable:focus-visible {
  outline: 3px solid rgba(74, 85, 104, 0.35);
  outline-offset: 4px;
}

.content-figure picture {
  display: block;
  width: 100%;
}

.content-figure picture img {
  display: block;
  width: 100%;
  height: auto;
}

.content-figure {
  margin: 0.8rem calc(var(--content-padding) * -1) 2rem;
  width: calc(100% + var(--content-padding) * 2);
  padding-bottom: 0.2rem;
}

.content-figure figcaption {
  margin-top: 0.4rem;
  padding-inline: var(--content-padding);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.spec-easter-egg {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(117, 170, 219, 0.24);
  box-shadow: 0 28px 72px rgba(8, 18, 35, 0.34);
  animation: spec-easter-reveal 340ms cubic-bezier(0.2, 0.85, 0.22, 1);
  transform-origin: top center;
  background:
    radial-gradient(120% 120% at 0% 0%, rgba(72, 120, 181, 0.28), transparent 48%),
    radial-gradient(130% 130% at 100% 0%, rgba(214, 121, 67, 0.18), transparent 46%),
    linear-gradient(180deg, #08111f 0%, #06101b 100%);
}

.spec-easter-egg-inner {
  display: flex;
  flex-direction: column;
}

.spec-easter-egg-body {
  display: grid;
  grid-template-columns: minmax(16rem, 20rem) minmax(0, 1fr);
  gap: 0.9rem;
  padding: 0.9rem;
  min-height: 0;
  flex: 1;
  align-items: stretch;
  min-height: clamp(21rem, 27vw, 30rem);
}

.spec-easter-egg-meta {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.7rem;
  min-height: 0;
  padding: 1rem 1.05rem;
  border-radius: 14px;
  border: 1px solid rgba(148, 198, 240, 0.14);
  background: linear-gradient(180deg, rgba(10, 22, 39, 0.82) 0%, rgba(8, 17, 31, 0.94) 100%);
}

.spec-easter-egg-copy {
  margin: 0;
  color: #b9cce4;
  font-size: 1rem;
  line-height: 1.7;
}

.spec-easter-egg-copy-muted {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.55;
  color: #88b9e2;
  overflow-wrap: anywhere;
}

.spec-easter-egg-pre {
  margin: 0;
  min-height: 0;
  height: 100%;
  overflow: auto;
  padding: 1rem 1.2rem;
  border-radius: 14px;
  border: 1px solid rgba(148, 198, 240, 0.14);
  background:
    linear-gradient(180deg, rgba(5, 10, 18, 0.96) 0%, rgba(3, 7, 14, 0.98) 100%);
  color: #dbeafe;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: clamp(0.76rem, 0.18vw + 0.72rem, 0.9rem);
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
  scrollbar-gutter: stable both-edges;
  tab-size: 2;
}

@keyframes spec-easter-reveal {
  from {
    opacity: 0;
    transform: translateY(-10px) scale(0.985);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Responsive */

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-main {
    padding: var(--content-padding-mobile);
  }

  .content-inner {
    padding: 1.1rem 1.1rem 1.4rem;
  }

  .content-figure {
    margin: 0.4rem calc(var(--content-padding-mobile) * -1) 1rem;
    width: calc(100% + var(--content-padding-mobile) * 2);
  }

  .content-figure figcaption {
    padding-inline: var(--content-padding-mobile);
  }

  .spec-easter-egg-inner {
    min-height: 0;
  }

  .spec-easter-egg-body {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .spec-easter-egg-pre {
    max-height: 19rem;
    font-size: 0.72rem;
  }

  .sub-nav-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .sub-nav-links {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .sub-nav-title {
    font-size: 1rem;
  }

  .nav-links button {
    font-size: 0.95rem;
    padding: 0.5rem 0.9rem;
  }

  .sub-nav-links button {
    font-size: 1.2rem;
    padding: 0.6rem 1.1rem;
  }

  .content-inner h1 {
    font-size: 2.4rem;
  }

  .content-inner h2 {
    font-size: 1.8rem;
  }

  .content-inner h3 {
    font-size: 1.3rem;
  }
}

.poster-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin: 0.8rem auto 1.6rem;
  padding: 0;
  border: 0;
  box-shadow: none;
  background: transparent;
  text-decoration: none;
}

.poster-preview {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  min-height: 220px;
  border: 0;
  background: transparent;
}

.poster-preview-loading::before {
  content: "Rendering poster preview...";
  color: var(--text-muted);
  font-size: 0.95rem;
}

.poster-canvas {
  display: block;
  border: 0;
  box-shadow: none;
  background: #ffffff;
}

.poster-preview-error {
  min-height: 140px;
  color: var(--text-muted);
  font-size: 0.95rem;
}