/* Box-sizing reset ensures padding and borders do not distort layout geometry. */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  width: 100%;
  overflow-x: hidden;
}

/* Fixed canvas sits behind content but in front of body background to render visible river currents. */
.river-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* Mist veil fixed over viewport creates an entry gate of underworld clouds that parts on scroll. */
.mist-veil {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 15;
  pointer-events: none;
  overflow: hidden;
}

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

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

.mist-right {
  transform-origin: right center;
}

/* Sections receive generous vertical rhythm to pace the reading experience like a classical manuscript. */
section {
  width: 100%;
  padding-block: var(--space-24);
  position: relative;
  z-index: 5;
}

/* Hero centers content vertically and horizontally to command immediate focus upon entering the void. */
#opening {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 5;
  padding-block: 0;
  padding-inline: var(--space-4);
}

/* Reading column uses game codex narrative framing to isolate typography while harmonizing with the page gradient. */
.reading-column {
  width: 100%;
  max-width: 720px;
  margin-inline: auto;
  padding-inline: var(--space-8);
  padding-block: var(--space-10);
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(8, 12, 17, 0.72) 0%, rgba(5, 8, 12, 0.85) 50%, rgba(8, 12, 17, 0.72) 100%);
  border-inline: 1px solid rgba(212, 175, 55, 0.10);
  border-radius: 4px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55);
}

/* Diagram wrapper isolates the soul well diagram with breathing room above and below. */
.diagram-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-block: var(--space-12);
  text-align: center;
}

/* Decree section expands vertical padding and clips boundaries for the chapter narrative. */
#decree {
  overflow: hidden;
  padding-block: var(--space-32);
}

/* Hunters container expands slightly wider than prose to accommodate card side-by-side presentation. */
.hunters-container {
  width: 100%;
  max-width: 960px;
  margin-inline: auto;
  padding-inline: var(--space-8);
  padding-block: var(--space-10);
  background: linear-gradient(180deg, rgba(8, 12, 17, 0.72) 0%, rgba(5, 8, 12, 0.85) 50%, rgba(8, 12, 17, 0.72) 100%);
  border-inline: 1px solid rgba(212, 175, 55, 0.10);
  border-radius: 4px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.55);
}

/* Hunter cards stack in a single column on mobile screens to preserve line length within cards. */
.hunters-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-12);
}

/* Play section receives extra bottom padding to establish clear conclusion before the footer. */
#play {
  padding-block: var(--space-24) var(--space-32);
}

#play .reading-column {
  align-items: center;
  text-align: center;
}

/* Leaderboard container sits within play column and takes full column width. */
.leaderboard-container {
  width: 100%;
  margin-block: var(--space-8);
  overflow-x: auto;
}

/* Footer layout provides distinct grounding separated by the river border. */
footer {
  width: 100%;
  padding: var(--space-12) var(--space-8);
  position: relative;
  z-index: 1;
}

.footer-inner {
  width: 100%;
  max-width: 960px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  justify-content: space-between;
  align-items: flex-start;
}

/* Hunter cards switch to 2x2 grid on desktop viewports to give equal visual weight to each hunter. */
@media (min-width: 640px) {
  .hunters-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .reading-column {
    padding-inline: var(--space-6);
  }

  .hunters-container {
    padding-inline: var(--space-6);
  }
}

/* Footer transforms into a balanced two-ended horizontal row on wide screens. */
@media (min-width: 900px) {
  .footer-inner {
    flex-direction: row;
    align-items: center;
  }
}

/* Reading column maintains strict 680px constraint on ultra-wide viewports. */
@media (min-width: 1200px) {
  .reading-column {
    max-width: 680px;
  }
}