@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=DM+Mono:wght@300;400&display=swap");

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  color-scheme: dark;

  --dark-bg: #0a0a0f;
  --dark-fg: #e8e4d9;
  --dark-muted: #6a6a7e;
  --dark-accent: #c8ff47;
  --dark-card-bg: rgba(10, 10, 15, 0.16);
  --dark-card-border: rgba(200, 255, 71, 0.18);

  --light-bg: #eef4ff;
  --light-fg: #0b141a;
  --light-muted: #6c8296;
  --light-accent: #1b7ed6;
  --light-card-bg: rgba(245, 249, 255, 0.82);
  --light-card-border: rgba(27, 126, 214, 0.22);

  --bg: var(--dark-bg);
  --fg: var(--dark-fg);
  --muted: var(--dark-muted);
  --accent: var(--dark-accent);
  --card-bg: var(--dark-card-bg);
  --card-border: var(--dark-card-border);

  --font-display: "Bebas Neue", sans-serif;
  --font-mono: "DM Mono", monospace;
  --hairline: 0.0625rem;
  --ui-inset: 2rem;
  --nav-x: calc(var(--ui-inset) + 0.125rem);
  --reveal-offset: 0.625rem;
  --reveal-duration: 0.5s;
  --card-radius: 0.875rem;
  --z-ui: 10;
}

:root[data-theme="light"] {
  color-scheme: light;

  --bg: var(--light-bg);
  --fg: var(--light-fg);
  --muted: var(--light-muted);
  --accent: var(--light-accent);
  --card-bg: var(--light-card-bg);
  --card-border: var(--light-card-border);
}

html {
  color-scheme: dark;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

#webgl_canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  z-index: 0;
  pointer-events: none;
}

#hud {
  position: fixed;
  top: var(--ui-inset);
  right: var(--ui-inset);
  z-index: var(--z-ui);
  text-align: right;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
}

#hud .progress-bar {
  width: 7.5rem;
  height: var(--hairline);
  background: var(--muted);
  margin-block-start: 0.5rem;
  margin-inline-start: auto;
  position: relative;
  overflow: hidden;
}

#hud .progress-fill {
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 0%;
  background: var(--accent);
  transition: width 0.1s linear;
}

#hud .scene-label {
  font-size: 0.6rem;
  color: var(--accent);
  margin-block-start: 0.4rem;
}

#scene_strip {
  position: fixed;
  left: var(--nav-x);
  top: 50%;
  translate: -50% -50%;
  z-index: var(--z-ui);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.scene-dot {
  width: 0.25rem;
  height: 0.25rem;
  border-radius: 50%;
  background: var(--muted);
  transition: background 0.3s, scale 0.3s;
}

.scene-dot.active {
  background: var(--accent);
  scale: 1.8;
}

#theme_toggle {
  position: fixed;
  bottom: var(--ui-inset);
  left: var(--nav-x);
  translate: -50% 0;
  z-index: var(--z-ui);
  width: 2rem;
  height: 2rem;
  border: none;
  background: color-mix(in srgb, var(--muted) 35%, transparent);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
}

#theme_toggle:hover {
  background: color-mix(in srgb, var(--muted) 55%, transparent);
}

#theme_toggle svg {
  width: 0.875rem;
  height: 0.875rem;
  position: absolute;
  transition: opacity 0.3s ease, rotate 0.3s ease;
  color: var(--accent);
}

:root[data-theme="light"] #theme_toggle svg {
  color: var(--fg);
}

#theme_toggle .icon-sun {
  opacity: 1;
  rotate: 0deg;
}

#theme_toggle .icon-moon {
  opacity: 0;
  rotate: 90deg;
}

:root[data-theme="light"] #theme_toggle .icon-sun {
  opacity: 0;
  rotate: -90deg;
}

:root[data-theme="light"] #theme_toggle .icon-moon {
  opacity: 1;
  rotate: 0deg;
}

#scroll_container {
  position: relative;
  z-index: 1;
}

section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 5rem;
}

.text-card {
  max-width: 23.75rem;
  padding: 2.25rem 2rem;
  background: var(--card-bg);
  border-left: var(--hairline) solid var(--card-border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

:root[data-theme="dark"] .text-card {
  border: var(--hairline) solid var(--card-border);
  border-radius: var(--card-radius);
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.text-card.right {
  margin-inline-start: auto;
  border-left: none;
  border-right: var(--hairline) solid var(--card-border);
  text-align: right;
}

.text-card.center {
  margin-inline: auto;
  border-left: none;
  border-top: var(--hairline) solid var(--card-border);
  text-align: center;
  max-width: 28.75rem;
}

.tag {
  font-size: 0.6rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-block-end: 1.1rem;
  opacity: 0;
  translate: 0 var(--reveal-offset);
  transition: opacity var(--reveal-duration) ease,
    translate var(--reveal-duration) ease;
}

.tag.visible {
  opacity: 1;
  translate: 0 0;
}

:is(h1, h2) {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.03em;
  line-height: 0.92;
  opacity: 0;
  translate: 0 1.125rem;
  transition: opacity var(--reveal-duration) ease 0.08s,
    translate var(--reveal-duration) ease 0.08s;
}

:is(h1, h2).visible {
  opacity: 1;
  translate: 0 0;
}

h1 {
  font-size: clamp(3rem, 8vw, 6.5rem);
}

h2 {
  font-size: clamp(2.2rem, 6vw, 5rem);
}

.body-text {
  font-size: 0.78rem;
  line-height: 1.8;
  color: color-mix(in srgb, var(--fg) 55%, transparent);
  margin-block-start: 1.25rem;
  opacity: 0;
  translate: 0 var(--reveal-offset);
  transition: opacity var(--reveal-duration) ease 0.2s,
    translate var(--reveal-duration) ease 0.2s;
}

.body-text.visible {
  opacity: 1;
  translate: 0 0;
}

.stat-row {
  display: flex;
  gap: 2.5rem;
  margin-block-start: 2rem;
  flex-wrap: wrap;
  opacity: 0;
  translate: 0 var(--reveal-offset);
  transition: opacity var(--reveal-duration) ease 0.3s,
    translate var(--reveal-duration) ease 0.3s;
}

.stat-row.visible {
  opacity: 1;
  translate: 0 0;
}

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

.stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.h-line {
  width: 3.125rem;
  height: var(--hairline);
  background: var(--accent);
  margin-block-end: 1.2rem;
  opacity: 0;
  scale: 0 1;
  transform-origin: left;
  transition: opacity 0.4s ease, scale 0.4s ease;
}

.h-line.visible {
  opacity: 1;
  scale: 1 1;
}

.text-card.right .h-line {
  transform-origin: right;
  margin-inline-start: auto;
}

.text-card.center .h-line {
  transform-origin: center;
  margin-inline: auto;
  margin-block-end: 1.2rem;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-block-start: 1.75rem;
  padding: 0.6rem 1.25rem;
  border: var(--hairline) solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  opacity: 0;
  translate: 0 var(--reveal-offset);
  transition: opacity var(--reveal-duration) ease 0.35s,
    translate var(--reveal-duration) ease 0.35s, background 0.2s, color 0.2s;
}

.cta.visible {
  opacity: 1;
  translate: 0 0;
}

.cta:hover {
  background: var(--accent);
  color: var(--bg);
}

.cta svg {
  width: 0.6875rem;
  height: 0.6875rem;
}

#credit {
  position: fixed;
  right: var(--ui-inset);
  top: 50%;
  transform: translateY(-50%) rotate(-90deg);
  transform-origin: right center;
  z-index: var(--z-ui);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
}

#credit a {
  color: var(--muted);
  text-decoration: none;
}

@media (width <= 60em) {
  section {
    padding: 5rem 3rem;
  }

  .text-card {
    max-width: 20rem;
  }
}

@media (width <= 37.5em) {
  :root {
    --ui-inset: 1.25rem;
  }

  section {
    padding: 4rem 1.25rem;
  }

  .text-card {
    max-width: 100%;
  }

  .text-card:is(.right, .center) {
    margin-inline: 0;
    text-align: left;
    border-right: none;
    border-top: none;
    border-left: var(--hairline) solid var(--card-border);
  }

  .text-card:is(.right, .center) .h-line {
    transform-origin: left;
    margin-inline-start: 0;
    margin-inline: 0;
  }

  #hud {
    top: 1rem;
    right: 1rem;
  }

  #scene_strip {
    display: none;
  }

  #theme_toggle {
    bottom: 1rem;
    left: 1.25rem;
    translate: 0 0;
  }

  .stat-row {
    gap: 1.5rem;
  }
}