/* Deep void background with dark cavern texture preserves underworld theme without bright atmospheric clash. */
body {
  background-color: var(--color-void);
  background-image: linear-gradient(180deg, rgba(7, 9, 14, 0.78) 0%, rgba(7, 9, 14, 0.94) 100%), url('../assets/images/underworld_cavern.webp');
  background-position: center top;
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  color: var(--color-soul);
  font-family: var(--font-body);
  font-size: var(--size-base);
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
}

/* River canvas sits behind layout with low opacity for subtle river currents. */
.river-canvas {
  opacity: 0.28;
}

/* Full-size photographic cloud banks part horizontally without warping. */
.mist-veil {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 25;
  pointer-events: none;
  overflow: hidden;
}

.mist-bank {
  position: absolute;
  top: 0;
  width: 180vw;
  height: 100%;
  pointer-events: none;
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

.mist-left {
  left: -10vw;
  transform-origin: left center;
}

.mist-right {
  left: auto;
  right: -10vw;
  transform-origin: right center;
}

/* A separate image layer keeps ambient drift independent of scroll parting. */
.mist-bank::before {
  content: '';
  position: absolute;
  inset: -3%;
  background-size: cover;
  background-repeat: no-repeat;
  animation: cloudDrift 20s ease-in-out infinite alternate;
  will-change: transform;
}

.mist-left::before {
  background-image: url('../assets/images/clouds_left.webp');
  background-position: left center;
  --cloud-drift-x: -1.2%;
}

.mist-right::before {
  background-image: url('../assets/images/clouds_right.webp');
  background-position: right center;
  --cloud-drift-x: 1.2%;
  animation-duration: 24s;
}

@keyframes cloudDrift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(var(--cloud-drift-x), -1.5%, 0);
  }
}

.mist-veil.is-cleared .mist-bank::before {
  animation-play-state: paused;
}

@media (prefers-reduced-motion: reduce) {
  .mist-bank::before {
    animation: none;
    will-change: auto;
  }
}

/* Skip link enables keyboard users to immediately reach primary game mechanics. */
.skip-link {
  position: fixed;
  left: 1rem;
  top: -100px;
  z-index: 50;
  background: var(--color-beacon);
  color: var(--color-void);
  padding: 0.6rem 1rem;
  font-family: var(--font-body);
  font-size: var(--size-xs);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--dur-fast) var(--ease-surface);
}

.skip-link:focus {
  top: 1rem;
}

/* Site header floats above hero to present minimal brand presence. */
.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 30;
  padding: 24px 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Wordmark uses roman display typography to anchor competition identity. */
.wordmark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-beacon);
  text-decoration: none;
}

.wordmark-mark {
  color: var(--color-echo);
}

/* Section kicker provides uppercase context label above main headings. */
.section-kicker {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-beacon);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

/* Standardized display headings across all sections enforce typographic consistency. */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-soul);
  letter-spacing: 0.04em;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-4);
}

h3 {
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--color-soul);
}

/* General section container bounds prose width for optimal reading rhythm. */
section:not(#opening) {
  padding: var(--space-24) max(24px, calc((100% - 1100px) / 2));
}

/* Hero section centers typography and primary actions against atmospheric backdrop. */
#opening {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 120px 24px 72px;
  position: relative;
  z-index: 2;
}

/* Hero chapter label sets technical competition framing. */
.opening-label {
  color: var(--color-echo);
  margin-bottom: var(--space-4);
}

/* Hero monumental title commands focal hierarchy with luminous gold tones. */
.opening-title {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 8vw, 5.5rem);
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--color-beacon);
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.opening-pretitle {
  font-size: 0.28em;
  letter-spacing: 0.32em;
  color: var(--color-echo);
}

.title-line {
  display: inline-block;
  white-space: nowrap;
}

/* Hero subtitle clarifies the tournament objective in a concise single statement. */
.opening-subtitle {
  font-family: var(--font-prose);
  font-style: italic;
  font-size: clamp(1.2rem, 2.2vw, 1.45rem);
  color: var(--color-soul);
  max-width: 620px;
  margin-bottom: var(--space-8);
  line-height: var(--leading-normal);
}

/* Action button row groups primary and secondary navigation triggers. */
.opening-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Primary CTA button uses high-contrast gold fill for immediate visual priority. */
.btn-cta {
  background-color: var(--color-beacon);
  color: var(--color-void);
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 28px;
  border: 1px solid var(--color-beacon);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-surface), transform var(--dur-fast) var(--ease-surface);
}

.btn-cta:hover {
  background-color: var(--color-beacon-dim);
  border-color: var(--color-beacon-dim);
  transform: translateY(-1px);
}

/* Secondary outline button provides visible low-priority path without competing with primary CTA. */
.btn-secondary {
  background-color: transparent;
  color: var(--color-soul);
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 24px;
  border: 1px solid var(--color-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-surface), color var(--dur-fast) var(--ease-surface);
}

.btn-secondary:hover {
  border-color: var(--color-beacon);
  color: var(--color-beacon);
}

/* Visible keyboard focus indicators guarantee accessible navigation. */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--color-beacon);
  outline-offset: 4px;
}

/* Scroll indicator provides discreet hint for downward traversal. */
.scroll-prompt {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  letter-spacing: var(--tracking-wider);
  color: var(--color-echo);
  text-transform: uppercase;
  margin-top: var(--space-12);
  text-decoration: none;
  opacity: 0.8;
  transition: opacity var(--dur-fast) var(--ease-surface);
}

.scroll-prompt:hover {
  opacity: 1;
  color: var(--color-beacon);
}

/* Match strip presents key tournament metrics in a disciplined horizontal ledger. */
.match-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  border-block: 1px solid var(--color-border);
  background-color: rgba(13, 18, 25, 0.6);
}

.match-strip span {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-echo);
  border-right: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-3);
}

.match-strip span:last-child {
  border-right: none;
}

.match-strip strong {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--color-beacon);
  font-weight: 400;
}

/* World section presents environment and core tournament objective in a balanced two-column grid. */
.world-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.world-copy p, .world-challenge p {
  color: var(--color-soul);
  font-size: 1.05rem;
  line-height: var(--leading-prose);
  margin-bottom: var(--space-4);
}

.world-highlight {
  color: var(--color-echo) !important;
  font-size: 0.95rem !important;
  border-left: 2px solid var(--color-beacon);
  padding-left: var(--space-4);
  margin-top: var(--space-4);
}

.world-challenge {
  padding-left: var(--space-8);
  border-left: 1px solid var(--color-border);
}

.world-challenge h3 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: var(--leading-tight);
  color: var(--color-soul);
  margin-bottom: var(--space-4);
  font-weight: 400;
}

/* Prologue dropdown allows users to expand the full lore and decree of Hades. */
.prologue-dropdown-container {
  grid-column: 1 / -1;
  margin-top: var(--space-8);
  width: 100%;
}

.prologue-accordion {
  border: 1px solid var(--color-border);
  background-color: rgba(11, 15, 22, 0.85);
  border-radius: 4px;
  transition: border-color var(--dur-fast) var(--ease-surface);
}

.prologue-accordion[open] {
  border-color: rgba(232, 200, 122, 0.25);
}

.prologue-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-echo);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--dur-fast) var(--ease-surface), background-color var(--dur-fast) var(--ease-surface);
}

.prologue-summary::-webkit-details-marker {
  display: none;
}

.prologue-summary:hover {
  color: var(--color-soul);
  background-color: rgba(232, 200, 122, 0.04);
}

.prologue-summary:focus-visible {
  outline: 2px solid var(--color-beacon);
  outline-offset: -2px;
}

.prologue-summary-icon {
  font-size: 1.15rem;
  line-height: 1;
  color: var(--color-beacon-dim);
  transition: transform var(--dur-fast) var(--ease-surface), color var(--dur-fast) var(--ease-surface);
}

.prologue-accordion[open] .prologue-summary {
  color: var(--color-soul);
  border-bottom: 1px solid var(--color-border);
}

.prologue-accordion[open] .prologue-summary-icon {
  transform: rotate(45deg);
  color: var(--color-beacon);
}

.prologue-full-text {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  padding: var(--space-8);
  background-color: rgba(7, 9, 14, 0.75);
}

.prologue-full-col {
  display: flex;
  flex-direction: column;
}

.prologue-full-col h4.prologue-col-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--color-soul);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-1);
}

.prologue-col-subtitle {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-beacon-dim);
  margin-bottom: var(--space-4);
  font-weight: 500;
}

.prologue-full-col p {
  font-family: var(--font-ui);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(226, 232, 240, 0.84);
  margin-bottom: var(--space-4);
}

.prologue-highlight {
  margin-top: auto;
  padding: var(--space-4);
  background-color: rgba(232, 200, 122, 0.04);
  border-left: 2px solid var(--color-beacon-dim);
  border-radius: 0 4px 4px 0;
  font-size: 0.875rem !important;
  line-height: 1.65 !important;
  color: var(--color-soul) !important;
}

/* Guide section encloses game mechanics in a deeper darkened backdrop. */
.guide-section {
  background-color: rgba(9, 12, 17, 0.85);
  border-block: 1px solid var(--color-border);
}

.section-heading {
  max-width: 700px;
  margin-bottom: var(--space-12);
}

.section-heading > p:last-child {
  color: var(--color-echo);
  font-size: 1.1rem;
  line-height: var(--leading-normal);
}

/* Mechanics layout pins map diagram beside sequential rule explanations. */
.mechanics-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-12);
  align-items: start;
}

/* River map figure creates subtle technical schematic framing for field waters. */
.river-map {
  position: sticky;
  top: 96px;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  background-color: var(--color-deep);
}

.river-map svg {
  width: 100%;
  height: auto;
  display: block;
}

.map-label {
  fill: var(--color-echo);
  font-family: var(--font-ui);
  font-size: 10px;
  letter-spacing: 1.2px;
}

/* Mechanics list organizes gameplay rules cleanly with index markers. */
.mechanics-list {
  list-style: none;
}

.mechanics-list li {
  display: flex;
  gap: var(--space-4);
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.mechanics-list li:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.mechanic-number {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  font-weight: 700;
  color: var(--color-beacon);
  padding-top: 4px;
}

.mechanics-list h3 {
  margin-bottom: var(--space-1);
}

.mechanics-list p {
  color: var(--color-echo);
  font-size: 0.95rem;
  line-height: var(--leading-normal);
}

/* Ranking panel isolates match victory criteria and tie-breakers. */
.ranking-panel {
  margin-top: var(--space-12);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-beacon);
  background-color: var(--color-deep);
}

.ranking-order {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  list-style: none;
  gap: var(--space-6);
  margin: var(--space-6) 0;
}

.ranking-order li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.9rem;
  color: var(--color-soul);
}

.ranking-order strong {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: var(--color-beacon);
  font-weight: 400;
}

.ranking-panel > p {
  font-size: 0.85rem;
  color: var(--color-echo);
}

.section-note {
  font-size: 0.85rem;
  color: var(--color-echo);
  margin-top: var(--space-6);
}

.section-note a, .text-link {
  color: var(--color-beacon);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.section-note a:hover, .text-link:hover {
  color: var(--color-soul);
}

/* Baseline strategy cards display the four standard bot benchmarks. */
.baseline-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-block: 1px solid var(--color-border);
  background-color: var(--color-deep);
}

.baseline {
  padding: var(--space-6);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.baseline:last-child {
  border-right: none;
}

.bot-index {
  font-family: var(--font-ui);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-echo);
  margin-bottom: var(--space-4);
}

.baseline h3 {
  font-size: 1.35rem;
  margin-bottom: var(--space-1);
}

.bot-title {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-beacon-dim);
  margin-bottom: var(--space-4);
}

.baseline p:not(.bot-title) {
  font-size: 0.9rem;
  line-height: var(--leading-normal);
  color: var(--color-echo);
  flex-grow: 1;
}

.bot-tradeoff {
  margin-top: var(--space-6);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-beacon);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Competition workflow layout presents submission, leaderboard, and finals steps. */
.competition-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.competition-flow article {
  padding: var(--space-8);
  background-color: var(--color-deep);
  border: 1px solid var(--color-border);
}

.competition-flow article > span {
  font-family: var(--font-ui);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-beacon);
  font-weight: 600;
}

.competition-flow h3 {
  margin: var(--space-3) 0 var(--space-2);
}

.competition-flow p {
  font-size: 0.95rem;
  line-height: var(--leading-normal);
  color: var(--color-echo);
}

/* Play section centers registration actions and terminal onboarding steps. */
#play {
  background-color: rgba(7, 9, 14, 0.95);
  border-top: 1px solid var(--color-border);
}

.play-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.play-intro {
  font-size: 1.15rem;
  color: var(--color-echo);
  margin-bottom: var(--space-6);
}

.ready-list {
  text-align: left;
  max-width: 580px;
  margin: var(--space-8) auto;
  padding-left: var(--space-6);
  font-size: 0.95rem;
  line-height: var(--leading-prose);
  color: var(--color-soul);
}

.ready-list li {
  padding: var(--space-2) 0;
}

.ready-list a {
  color: var(--color-beacon);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.state-active-content {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-8);
}

.state-ended-content {
  display: none;
  width: 100%;
  flex-direction: column;
  align-items: center;
  margin-top: var(--space-8);
}

.status-label {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-beacon);
  margin-bottom: var(--space-2);
}

body.competition-ended .state-active-content {
  display: none;
}

body.competition-ended .state-ended-content {
  display: flex;
}

/* Leaderboard view states guarantee feedback during async tally operations. */
.leaderboard-container {
  width: 100%;
  margin-top: var(--space-6);
  overflow-x: auto;
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.leaderboard-table caption {
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-echo);
  padding-bottom: var(--space-3);
  text-align: left;
}

.leaderboard-table th {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-echo);
  font-weight: 600;
  font-family: var(--font-ui);
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.leaderboard-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--color-soul);
  font-family: var(--font-ui);
}

.leaderboard-empty,
.leaderboard-error,
.leaderboard-loading {
  padding: var(--space-8);
  font-style: italic;
  color: var(--color-echo);
  text-align: center;
}

/* Footer layout grounds resources with restrained symmetry. */
footer {
  background-color: var(--color-void);
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer-identity {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-beacon);
  letter-spacing: 0.04em;
}

.footer-subtitle {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-echo);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  align-items: center;
}

.footer-links a {
  font-family: var(--font-ui);
  color: var(--color-echo);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--dur-fast) var(--ease-surface);
}

.footer-links a:hover {
  color: var(--color-beacon);
}