/* =========================================================================
   Aetheria: Boundless Realms — field guide
   "Gloaming codex": dusk-twilight base, warm ember horizon, and the six
   elemental aspects as a recurring spectrum. Type: Marcellus (carved caps,
   headings) / Spectral (literary body) / Spline Sans Mono (data + code).
   ========================================================================= */

:root {
  --void:    #0E0B1A;
  --dusk:    #16112A;
  --dusk-2:  #1C1636;
  --gloam:   #2C2350;
  --gloam-2: #3A2F66;

  --ember:   #E8714C;   /* atmosphere only — the dusk horizon */
  --portal:  #5BC8E8;   /* primary interactive accent */
  --portal-soft: rgba(91, 200, 232, 0.14);

  --mist:    #DAD4F2;   /* primary text */
  --haze:    #9C94C0;   /* secondary text */
  --haze-2:  #6C6490;   /* faint text */

  /* signature: a spectral sweep across the six aspect colours */
  --spectrum: linear-gradient(90deg,
      #FF5533 0%, #CC9944 22%, #FFE066 40%, #66DD88 60%, #3399FF 80%, #9966CC 100%);

  --display: "Marcellus", "Noto Sans JP", "Times New Roman", serif;
  --body:    "Spectral", "Noto Sans JP", Georgia, serif;
  --mono:    "Spline Sans Mono", "Noto Sans JP", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --sidebar-w: 268px;
  --measure: 46rem;
  --radius: 14px;
  --radius-sm: 9px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--void);
  color: var(--mist);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* faint vertical aurora wash so the void is never flat */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(1100px 520px at 78% -8%, rgba(232, 113, 76, 0.10), transparent 60%),
    radial-gradient(900px 700px at 6% 4%, rgba(91, 200, 232, 0.08), transparent 55%),
    radial-gradient(1000px 800px at 50% 120%, rgba(153, 102, 204, 0.10), transparent 60%);
}

a { color: var(--portal); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--portal);
  outline-offset: 3px;
  border-radius: 3px;
}

code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: #BDE9F6;
  background: var(--portal-soft);
  border: 1px solid rgba(91, 200, 232, 0.22);
  padding: 0.08em 0.42em;
  border-radius: 6px;
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  background: var(--dusk-2);
  color: var(--mist);
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ----------------------------------------------------------------- shell */

.shell { position: relative; z-index: 1; display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  position: sticky;
  top: 0;
  align-self: flex-start;
  height: 100vh;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--dusk) 0%, #120D24 100%);
  border-right: 1px solid var(--gloam);
  padding: 1.5rem 1rem 2rem;
}

.main {
  flex: 1 1 auto;
  min-width: 0;
  padding: clamp(1.5rem, 4vw, 4rem) clamp(1.2rem, 5vw, 4.5rem) 3rem;
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------------------------- sidebar */

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--mist);
  padding: 0.25rem 0.5rem 1.1rem;
  border-bottom: 1px solid var(--gloam);
  margin-bottom: 1.1rem;
}
.brand:hover { text-decoration: none; }
.brand-mark { width: 34px; height: 34px; color: var(--portal); flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--display); font-size: 1.28rem; letter-spacing: 0.04em; }
.brand-sub {
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.26em;
  color: var(--haze);
  margin-top: 0.2rem;
}

.nav-search { margin-bottom: 1.25rem; }
#nav-filter {
  width: 100%;
  background: var(--void);
  border: 1px solid var(--gloam);
  border-radius: var(--radius-sm);
  color: var(--mist);
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.55rem 0.7rem;
}
#nav-filter::placeholder { color: var(--haze-2); }
#nav-filter:focus { border-color: var(--portal); outline: none; }

.nav-group { margin-bottom: 1.35rem; }
.nav-group.is-hidden { display: none; }
.nav-eyebrow {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--haze-2);
  padding: 0 0.6rem 0.5rem;
}
.nav-group ul { list-style: none; margin: 0; padding: 0; }
.nav-link {
  display: block;
  position: relative;
  color: var(--haze);
  font-size: 0.95rem;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
}
.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 3px;
  height: 60%;
  border-radius: 3px;
  background: var(--accent, var(--portal));
  transition: transform 0.18s ease;
}
.nav-link:hover { color: var(--mist); background: rgba(255, 255, 255, 0.03); text-decoration: none; }
.nav-link.is-active { color: var(--mist); background: rgba(255, 255, 255, 0.05); }
.nav-link.is-active::before { transform: translateY(-50%) scaleY(1); }
.nav-link.is-filtered { display: none; }

/* ------------------------------------------------------------------ hero */

.hero {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--gloam);
  overflow: hidden;
  padding: clamp(2rem, 5vw, 3.4rem) clamp(1.5rem, 4vw, 3rem) clamp(2.2rem, 5vw, 3.2rem);
  margin-bottom: 1.6rem;
  background:
    linear-gradient(180deg, rgba(28, 22, 54, 0.2), rgba(14, 11, 26, 0.65)),
    linear-gradient(120deg, #1b1338 0%, #241a44 45%, #2a1c40 100%);
}
/* the dusk horizon: a slow ember glow rising from the lower edge */
.hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -55%;
  height: 90%;
  background: radial-gradient(60% 100% at 50% 100%,
      rgba(232, 113, 76, 0.40) 0%, rgba(232, 113, 76, 0.10) 45%, transparent 72%);
  filter: blur(6px);
  animation: horizon 14s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes horizon {
  from { opacity: 0.65; transform: translateY(6px) scaleX(0.96); }
  to   { opacity: 1;    transform: translateY(-4px) scaleX(1.04); }
}
.hero-eyebrow {
  position: relative;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.34em;
  color: var(--ember);
}
.hero-title {
  position: relative;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: 0.02em;
  margin: 0.7rem 0 0;
  color: #F1ECFF;
}
.hero-title-sub {
  display: block;
  font-size: clamp(0.9rem, 2.2vw, 1.25rem);
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--haze);
  margin-top: 0.7rem;
}
.hero-lede {
  position: relative;
  max-width: 40rem;
  margin: 1.3rem 0 0;
  font-size: 1.16rem;
  color: #C7C0E6;
}

/* ------------------------------------------------------- spectrum (signature) */

.spectrum {
  display: flex;
  gap: 4px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--gloam);
  background: var(--dusk);
  padding: 4px;
}
.spectrum-band {
  flex: 1 1 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  min-height: 76px;
  padding: 0.6rem 0.3rem;
  border-radius: 6px;
  background:
    linear-gradient(180deg, transparent 35%, rgba(0, 0, 0, 0.5)),
    var(--band);
  box-shadow: inset 0 0 22px -6px var(--band), 0 0 0 1px rgba(0, 0, 0, 0.2);
  position: relative;
}
.spectrum-band::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 6px;
  box-shadow: 0 6px 24px -8px var(--band);
  opacity: 0.8;
}
.spectrum-name {
  font-family: var(--mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #0E0B1A;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.82);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

/* -------------------------------------------------------------- articles */

.article { max-width: 64rem; }
.article--home { max-width: 70rem; }

.article-head { margin-bottom: 2rem; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--accent, var(--portal));
}
.title {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2.1rem, 5vw, 3.3rem);
  line-height: 1.04;
  margin: 0.6rem 0 0;
  color: #F1ECFF;
}
.lede {
  max-width: var(--measure);
  font-size: 1.2rem;
  color: var(--haze);
  margin: 1rem 0 0;
}
.rule {
  height: 3px;
  width: 96px;
  margin-top: 1.6rem;
  border-radius: 3px;
  background: var(--spectrum);
}

.article-body { display: grid; gap: 1rem; }
.prose { min-width: 0; max-width: var(--measure); }

@media (min-width: 1040px) {
  .has-infobox .article-body {
    grid-template-columns: minmax(0, 1fr) 252px;
    gap: 2.4rem;
    align-items: start;
  }
  .has-infobox .prose { grid-column: 1; grid-row: 1; }
  .has-infobox .infobox { grid-column: 2; grid-row: 1; position: sticky; top: 2rem; }
}

.block { margin-top: 2.1rem; }
.block:first-child { margin-top: 0; }

.section-head {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: 0.01em;
  color: #E9E3FF;
  margin: 0 0 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gloam);
}

.prose p, .article--home p { margin: 0 0 1rem; }
.prose strong, .article--home strong { color: #EDE8FF; font-weight: 600; }

/* lists */
ul, ol { margin: 0 0 1rem; padding-left: 0; list-style: none; }
.prose li, .article--home li { position: relative; padding-left: 1.5rem; margin: 0.5rem 0; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.7em;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  background: var(--accent, var(--portal));
  opacity: 0.85;
}
ol.steps { counter-reset: step; }
ol.steps li { padding-left: 2.5rem; margin: 0.8rem 0; }
ol.steps li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.05em;
  width: 1.7rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--portal);
  background: var(--portal-soft);
  border: 1px solid rgba(91, 200, 232, 0.3);
  border-radius: 50%;
}

/* note callout */
.note {
  position: relative;
  margin: 1.4rem 0;
  padding: 1rem 1.1rem 1rem 1.2rem;
  background: rgba(91, 200, 232, 0.06);
  border: 1px solid rgba(91, 200, 232, 0.18);
  border-left: 3px solid var(--portal);
  border-radius: var(--radius-sm);
  color: #C8C2E4;
  font-size: 0.98rem;
}
.note-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--portal);
  margin-bottom: 0.35rem;
}

/* tables */
.table-wrap { overflow-x: auto; margin: 0 0 1rem; border: 1px solid var(--gloam); border-radius: var(--radius-sm); }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
thead th {
  text-align: left;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--haze);
  background: var(--dusk);
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--gloam);
}
tbody td { padding: 0.7rem 0.9rem; border-bottom: 1px solid rgba(44, 35, 80, 0.6); vertical-align: top; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.018); }

/* cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
  gap: 1rem;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.3rem 1.3rem 1.15rem;
  background: linear-gradient(180deg, var(--dusk-2), var(--dusk));
  border: 1px solid var(--gloam);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--accent, var(--portal));
  opacity: 0.85;
}
.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent, var(--portal)) 55%, var(--gloam));
  box-shadow: 0 18px 40px -22px var(--accent, var(--portal));
  text-decoration: none;
}
.card-title { font-family: var(--display); font-size: 1.28rem; color: #EFEAFF; letter-spacing: 0.01em; }
.card-text { color: var(--haze); font-size: 0.96rem; }
.card-go {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent, var(--portal));
}

/* chips */
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 1.1rem; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--mist);
  background: var(--dusk-2);
  border: 1px solid var(--gloam);
  border-radius: 999px;
  padding: 0.32rem 0.8rem 0.32rem 0.7rem;
}
.chip::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--chip, var(--portal));
  box-shadow: 0 0 10px -1px var(--chip, var(--portal));
}

/* infobox */
.infobox {
  background: linear-gradient(180deg, var(--dusk-2), var(--dusk));
  border: 1px solid var(--gloam);
  border-top: 3px solid var(--accent, var(--portal));
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem 1.25rem;
}
.infobox-title {
  font-family: var(--mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--accent, var(--portal));
  margin-bottom: 0.7rem;
}
.infobox dl { margin: 0; }
.infobox-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(44, 35, 80, 0.7);
}
.infobox-row:last-child { border-bottom: none; }
.infobox dt { color: var(--haze); font-size: 0.82rem; font-family: var(--mono); letter-spacing: 0.02em; }
.infobox dd { margin: 0; color: var(--mist); font-family: var(--mono); font-size: 0.86rem; text-align: right; }

/* footer */
.footer {
  margin-top: auto;
  padding-top: 2.5rem;
  margin-top: 3.5rem;
  border-top: 1px solid var(--gloam);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--haze);
}
.footer-fine { color: var(--haze-2); }

/* ------------------------------------------------- mobile menu / drawer */

.menu-toggle {
  display: none;
  position: fixed;
  top: 0.9rem;
  left: 0.9rem;
  z-index: 60;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--dusk-2);
  border: 1px solid var(--gloam);
  cursor: pointer;
  padding: 0;
}
.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: var(--mist);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.sidebar-scrim { display: none; }

@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .sidebar {
    position: fixed;
    z-index: 55;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 24px 0 60px -30px #000;
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .sidebar-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 50;
    background: rgba(5, 4, 12, 0.6);
  }
  .main { padding-top: 4.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .card, .nav-link, .nav-link::before { transition: none; }
}

/* ------------------------------------------------------- language switch */

.lang-toggle {
  display: inline-flex;
  gap: 2px;
  margin: 0 0.5rem 1.2rem;
  padding: 3px;
  background: var(--void);
  border: 1px solid var(--gloam);
  border-radius: 999px;
}
.lang-opt {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--haze);
  padding: 0.26rem 0.72rem;
  border-radius: 999px;
  line-height: 1.4;
  transition: color 0.15s ease, background 0.15s ease;
}
.lang-opt:hover { color: var(--mist); text-decoration: none; }
.lang-opt.is-active { background: var(--portal-soft); color: #BDE9F6; }

/* Japanese reads a touch better with slightly looser lines */
.lang-ja .lede,
.lang-ja .hero-lede,
.lang-ja .prose p { line-height: 1.85; }