:root {
  color-scheme: dark;
  --sp-bg: #030403;
  --sp-bg2: #090a07;
  --sp-text: #d8d6c3;
  --sp-muted: #738066;
  --sp-line: #26352d;
  --sp-cyan: #b7c2a0;
  --sp-red: #be5c52;
  --sp-amber: #d8c77c;
  --sp-font: "Segoe UI", system-ui, sans-serif;
  --sp-mono: Consolas, "Courier New", monospace;
}

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

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  background: var(--sp-bg);
  color: var(--sp-text);
  font-family: var(--sp-font);
  font-size: 14px;
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(216, 199, 124, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(216, 199, 124, 0.012) 1px, transparent 1px);
  background-size: 18px 18px, 42px 42px;
  opacity: 0.22;
  mix-blend-mode: normal;
  z-index: 0;
}

.sp-container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 32px 80px;
}

a.sp-link,
.sp-nav a {
  color: var(--sp-muted);
  text-decoration: none;
  font-family: var(--sp-mono);
  font-size: 13px;
  border-bottom: 1px solid transparent;
  transition: color 200ms, border-color 200ms;
}

a.sp-link:hover,
.sp-nav a:hover {
  color: var(--sp-text);
  border-bottom-color: var(--sp-line);
}

.sp-eyebrow {
  display: block;
  margin-bottom: 4px;
  color: var(--sp-muted);
  font-family: var(--sp-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sp-mono {
  font-family: var(--sp-mono);
}

.sp-rule {
  margin: 32px 0;
  border: none;
  border-top: 1px solid var(--sp-line);
}

.sp-back {
  display: inline-block;
  margin-top: 48px;
  color: var(--sp-muted);
  font-family: var(--sp-mono);
  font-size: 11px;
  text-decoration: none;
  letter-spacing: 0.08em;
}

.sp-back:hover {
  color: var(--sp-text);
}

.ky-signal {
  margin: 22px 0 0;
  padding: 10px 12px;
  border: 1px dotted #41503f;
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.018) 0 1px, transparent 1px 5px),
    rgba(10, 11, 7, 0.72);
  color: #8f9b78;
  font-family: var(--sp-mono);
  font-size: 11px;
}

.ky-signal[data-phase="2"],
.ky-signal[data-phase="3"] {
  border-color: rgba(190, 92, 82, 0.55);
  color: #c8b889;
}

.ky-signal-head {
  margin-bottom: 4px;
  color: #d8c77c;
  letter-spacing: 0.12em;
}

.ky-signal-body {
  color: inherit;
}

.sp-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sp-nav li {
  border-top: 1px solid var(--sp-line);
}

.sp-nav li:last-child {
  border-bottom: 1px solid var(--sp-line);
}

.sp-nav a {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
}

.sp-nav .nav-label {
  color: var(--sp-text);
  font-size: 13px;
}

.sp-nav .nav-hint {
  color: var(--sp-muted);
  font-size: 11px;
}

@keyframes sp-scan {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100vh); }
}

.sp-scanline {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(transparent, rgba(118, 245, 222, 0.04), transparent);
  pointer-events: none;
  animation: sp-scan 14s linear infinite;
  z-index: 2;
}

.sp-log-entry {
  display: block;
  padding: 6px 0;
  color: var(--sp-muted);
  font-family: var(--sp-mono);
  font-size: 11px;
  border-bottom: 1px solid rgba(21, 32, 32, 0.6);
}

.sp-log-entry.highlight {
  color: var(--sp-text);
}

@keyframes sp-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.sp-cursor::after {
  content: "_";
  color: var(--sp-muted);
  animation: sp-blink 1.2s step-end infinite;
}

@keyframes sp-fadein {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.sp-fadein {
  animation: sp-fadein 0.6s ease both;
}

@media (max-width: 600px) {
  .sp-container {
    padding: 36px 20px 60px;
  }
}

/* KYOUKAI entrance altar */
.altar-page {
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 18%, rgba(247, 24, 174, 0.22), transparent 35%),
    radial-gradient(circle at 18% 68%, rgba(23, 241, 255, 0.16), transparent 28%),
    radial-gradient(circle at 84% 74%, rgba(92, 255, 80, 0.15), transparent 26%),
    #020102;
  color: #fff2d6;
  overflow-x: hidden;
}

.altar-page::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.22) 0 1px, transparent 1px 4px);
  mix-blend-mode: multiply;
}

.altar-shell {
  position: relative;
  z-index: 1;
  width: min(100vw, 1640px);
  margin: 0 auto;
  padding: clamp(10px, 2vw, 26px);
}

.altar-caption {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin: 0 0 10px;
  font-family: var(--sp-mono);
  font-size: clamp(10px, 1.4vw, 13px);
  color: #ffef8d;
  text-shadow:
    0 0 8px rgba(255, 45, 198, 0.8),
    0 0 18px rgba(23, 241, 255, 0.55);
}

.altar-caption strong {
  color: #8dffbf;
  font-weight: 400;
}

.altar-frame {
  position: relative;
  width: 100%;
  overflow: hidden;
  border: 2px solid rgba(255, 42, 174, 0.5);
  background: #050005;
  box-shadow:
    0 0 22px rgba(255, 42, 174, 0.48),
    0 0 44px rgba(23, 241, 255, 0.24),
    inset 0 0 60px rgba(0, 0, 0, 0.78);
}

.altar-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(255, 0, 128, 0.15), transparent 12%, transparent 88%, rgba(0, 220, 255, 0.16)),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 9px);
  mix-blend-mode: screen;
}

.altar-image {
  display: block;
  width: 100%;
  height: auto;
  min-height: 62vh;
  object-fit: cover;
  filter: saturate(1.22) contrast(1.08) brightness(0.96);
}

.altar-noise {
  position: fixed;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  opacity: 0.18;
  background:
    repeating-radial-gradient(circle at 18% 24%, rgba(255, 255, 255, 0.24) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(117deg, transparent 0 6px, rgba(255, 0, 160, 0.14) 6px 7px);
  animation: altarNoise 520ms steps(2, end) infinite;
}

.hotspot {
  position: absolute;
  z-index: 3;
  display: grid;
  place-items: center;
  min-width: 46px;
  min-height: 28px;
  padding: 0;
  border: 1px solid rgba(255, 245, 150, 0.12);
  background: rgba(4, 0, 8, 0.025);
  color: transparent;
  font-family: var(--sp-mono);
  font-size: clamp(10px, 1.35vw, 15px);
  line-height: 1.1;
  text-decoration: none;
  text-shadow:
    2px 0 0 rgba(255, 0, 140, 0.75),
    -2px 0 0 rgba(0, 240, 255, 0.68),
    0 0 8px rgba(255, 255, 255, 0.55);
  box-shadow: 0 0 10px rgba(255, 0, 170, 0.08);
  animation: hotspotPulse 2.4s ease-in-out infinite;
}

.hotspot span {
  display: none;
}

.hotspot::before {
  content: "";
  position: absolute;
  inset: -5px;
  border: 1px dashed rgba(0, 255, 140, 0.22);
  opacity: 0;
}

.hotspot:hover,
.hotspot:focus-visible {
  color: transparent;
  background: rgba(255, 0, 160, 0.08);
  border-color: rgba(255, 255, 255, 0.34);
  outline: none;
  transform: translate(1px, -1px) skewX(-2deg);
  box-shadow:
    0 0 14px rgba(255, 0, 170, 0.62),
    0 0 22px rgba(0, 240, 255, 0.42);
}

.hotspot:hover::before,
.hotspot:focus-visible::before {
  opacity: 1;
  animation: hotspotJitter 180ms steps(2, end) infinite;
}

.hotspot-observation { left: 42%; top: 47%; width: 16%; height: 11%; }
.hotspot-archive { left: 66%; top: 35%; width: 10%; height: 17%; }
.hotspot-signal { left: 80%; top: 45%; width: 12%; height: 24%; }
.hotspot-signal-alt { left: 24%; top: 57%; width: 13%; height: 10%; }
.hotspot-exit { left: 17%; top: 33%; width: 12%; height: 17%; }
.hotspot-null { left: 2%; top: 27%; width: 12%; height: 24%; }
.hotspot-boundary { left: 77%; top: 7%; width: 17%; height: 14%; }

.altar-signal-panel {
  position: relative;
  margin: 12px 0 0 auto;
  width: min(520px, 100%);
  padding: 10px 12px;
  border: 1px solid rgba(0, 255, 140, 0.42);
  background:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.035) 0 1px, transparent 1px 6px),
    rgba(6, 0, 9, 0.76);
  color: #d8ffd0;
  font-family: var(--sp-mono);
  font-size: 12px;
  box-shadow:
    0 0 16px rgba(0, 255, 140, 0.25),
    0 0 32px rgba(255, 0, 160, 0.18);
}

.altar-signal-panel[data-phase="2"],
.altar-signal-panel[data-phase="3"] {
  border-color: rgba(255, 45, 198, 0.75);
  color: #ffe2fb;
  animation: panelBlink 1.4s steps(2, end) infinite;
}

.altar-signal-title {
  margin-bottom: 4px;
  color: #ffef8d;
}

.midnight .altar-image {
  filter: saturate(1.42) contrast(1.16) hue-rotate(-12deg);
}

.midnight .altar-caption strong {
  color: #ff77d8;
}

.mutated-altar .altar-frame {
  box-shadow:
    0 0 24px rgba(255, 42, 174, 0.62),
    0 0 54px rgba(23, 241, 255, 0.34),
    inset 0 0 80px rgba(255, 0, 88, 0.2);
}

@keyframes altarNoise {
  0% { transform: translate(0, 0); }
  50% { transform: translate(-1px, 1px); }
  100% { transform: translate(1px, -1px); }
}

@keyframes hotspotPulse {
  0%, 100% { opacity: 0.72; }
  50% { opacity: 1; }
}

@keyframes hotspotJitter {
  0% { transform: translate(0, 0); }
  50% { transform: translate(2px, -1px); }
  100% { transform: translate(-1px, 1px); }
}

@keyframes panelBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.72; }
}

@media (max-width: 720px) {
  .altar-shell {
    padding: 8px;
  }

  .altar-caption {
    flex-direction: column;
    gap: 2px;
  }

  .altar-image {
    min-height: 72vh;
  }

  .hotspot {
    min-width: 54px;
    min-height: 28px;
    padding: 4px 6px;
  }
}