:root {
  --color-black: #000;
  --color-white: #fff;

  --color-green: #33ff33;
  --color-green-light: #94fb94;
  --color-green-dark: #158e15;
  --color-green-darker: #1a3d1a;

  --color-orange: #ffa533;
  --color-orange-light: #fbd294;
  --color-orange-dark: #8e4c15;
  --color-orange-darker: #3d241a;

  --color-crt-black: rgb(25, 25, 30);
  --color-magenta: #ff00ff;
  --color-red: #ff0000;

  --crt-red: rgb(218, 49, 49);
  --crt-green: rgb(112, 159, 115);
  --crt-blue: rgb(40, 129, 206);

  --font-mono: "Cascadia Code", Menlo, Monaco, Consolas, "Courier New", monospace;
  --line-height: 1.4;
}

html {
  font-size: calc(100vh / 48);
}

html,
body {
  height: 100%;
  background: var(--color-black);
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
  overflow-y: hidden;
}

header {
  padding: 1ch;
  text-align: center;
  color: var(--color-green);
  font-family: var(--font-mono);
}
header h1 {
  margin: 0;
  font-size: 3ch;
  line-height: var(--line-height);
}

.terminal {
  width: 83ch;
  height: 26lh;
  padding: 1ch;
  color: var(--color-green);
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: var(--line-height);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  user-select: none;
  animation-name: flicker;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
  text-shadow: 0 0 0.2em currentColor;
  background: radial-gradient(circle at center, rgb(28 52 24) 0%, #000 150%);
  max-width: 90vw;
  max-height: 90vh;
}

#noise-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.7;
  background-repeat: repeat;
  background-size: 50px 50px;
  z-index: 2;
}

.scanline {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: rgba(51, 255, 51, 0.2);
  top: 0;
  animation: scan-moving 6s linear infinite, scan-flicker 0.5s infinite alternate;
  pointer-events: none;
  z-index: 4;
  box-shadow: 0 0 40px rgba(51, 255, 51, 0.9), 0 -10px 40px rgba(51, 255, 51, 1), 0 -20px 40px rgba(51, 255, 51, 0.99),
    0 -30px 40px rgba(51, 255, 51, 0.98), 0 -40px 40px rgba(51, 255, 51, 0.97), 0 -50px 40px rgba(51, 255, 51, 0.96),
    0 -60px 40px rgba(51, 255, 51, 0.95), 0 -70px 40px rgba(51, 255, 51, 0.94), 0 -80px 40px rgba(51, 255, 51, 0.93),
    0 -90px 40px rgba(51, 255, 51, 0.92), 0 -100px 40px rgba(51, 255, 51, 0.9), 0 -110px 40px rgba(51, 255, 51, 0.88),
    0 -120px 40px rgba(51, 255, 51, 0.86), 0 -130px 40px rgba(51, 255, 51, 0.84), 0 -140px 40px rgba(51, 255, 51, 0.82),
    0 -150px 40px rgba(51, 255, 51, 0.8), 0 -160px 40px rgba(51, 255, 51, 0.78), 0 -170px 40px rgba(51, 255, 51, 0.76),
    0 -180px 40px rgba(51, 255, 51, 0.74), 0 -190px 40px rgba(51, 255, 51, 0.72), 0 -200px 40px rgba(51, 255, 51, 0.7),
    0 -210px 40px rgba(51, 255, 51, 0.68), 0 -220px 40px rgba(51, 255, 51, 0.66), 0 -230px 40px rgba(51, 255, 51, 0.64),
    0 -240px 40px rgba(51, 255, 51, 0.62), 0 -250px 40px rgba(51, 255, 51, 0.6), 0 -260px 40px rgba(51, 255, 51, 0.58),
    0 -270px 40px rgba(51, 255, 51, 0.56), 0 -280px 40px rgba(51, 255, 51, 0.54), 0 -290px 40px rgba(51, 255, 51, 0.52),
    0 -300px 40px rgba(51, 255, 51, 0.5), 0 -310px 40px rgba(51, 255, 51, 0.48), 0 -320px 40px rgba(51, 255, 51, 0.46),
    0 -330px 40px rgba(51, 255, 51, 0.44), 0 -340px 40px rgba(51, 255, 51, 0.42), 0 -350px 40px rgba(51, 255, 51, 0.4),
    0 -360px 40px rgba(51, 255, 51, 0.38), 0 -370px 40px rgba(51, 255, 51, 0.36), 0 -380px 40px rgba(51, 255, 51, 0.34),
    0 -390px 40px rgba(51, 255, 51, 0.32), 0 -400px 40px rgba(51, 255, 51, 0.3), 0 -410px 40px rgba(51, 255, 51, 0.28),
    0 -420px 40px rgba(51, 255, 51, 0.26), 0 -430px 40px rgba(51, 255, 51, 0.24), 0 -440px 40px rgba(51, 255, 51, 0.22),
    0 -450px 40px rgba(51, 255, 51, 0.2), 0 -460px 40px rgba(51, 255, 51, 0.18), 0 -470px 40px rgba(51, 255, 51, 0.16),
    0 -480px 40px rgba(51, 255, 51, 0.14), 0 -490px 40px rgba(51, 255, 51, 0.12), 0 -500px 40px rgba(51, 255, 51, 0.1);
}

@keyframes scan-flicker {
  0%,
  100% {
    opacity: 0.1;
  }
  50% {
    opacity: 0.2;
  }
}

@keyframes scan-moving {
  0%,
  16.67% {
    top: 0;
    opacity: 0;
  }
  16.68% {
    top: 0;
    opacity: 0.2;
  }
  100% {
    top: calc(100% + 450px);
    opacity: 0.2;
  }
}

@keyframes noise-move {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 100% 100%;
  }
}

.crt {
  text-shadow: 0 0 0.2em currentColor, 1px 1px rgba(255, 0, 255, 0.5), -1px -1px rgba(0, 255, 255, 0.4);
  position: relative;
}

.crt::before,
.crt::after {
  content: "";
  transform: translateZ(0);
  pointer-events: none;
  opacity: 1;
  mix-blend-mode: overlay;
  position: absolute;
  height: 100%;
  width: 100%;
  left: 0;
  top: 0;
  z-index: 1;
}

.crt::before {
  background: repeating-linear-gradient(var(--crt-red) 0px, var(--crt-green) 2px, var(--crt-blue) 4px);
}

.crt::after {
  background: repeating-linear-gradient(90deg, var(--crt-red) 1px, var(--crt-green) 2px, var(--crt-blue) 3px);
}

@keyframes flicker {
  0%,
  100% {
    filter: brightness(1);
  }
  3% {
    filter: brightness(0.92);
  }
  7% {
    filter: brightness(1.05);
  }
  11% {
    filter: brightness(0.97);
  }
  17% {
    filter: brightness(1.08);
  }
  23% {
    filter: brightness(0.95);
  }
  31% {
    filter: brightness(1.02);
  }
  40% {
    filter: brightness(0.98);
  }
  55% {
    filter: brightness(1.06);
  }
  70% {
    filter: brightness(0.94);
  }
  85% {
    filter: brightness(1.1);
  }
}

@keyframes ghostFade {
  to {
    color: rgba(51, 255, 51, 1);
    text-shadow: 0 0 0.3em currentColor;
  }
  from {
    color: rgba(51, 255, 51, 0.2);
    text-shadow: 0 0 0.1em currentColor;
  }
}

.char {
  animation: ghostFade 0.15s ease-out forwards;
}

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0;
  }
}

.cursor {
  display: inline-block;
  width: 0.6ch;
  animation: blink 1s step-start infinite;
}

.cursor.typing {
  animation: none;
}

.blinking {
  animation: blinkAnimation 0.1s;
}

@keyframes blinkAnimation {
  0% {
    color: var(--color-green);
  }
  50% {
    color: var(--color-white);
  }
  100% {
    color: var(--color-green);
  }
}

#grid {
  display: flex;
  flex-direction: column;
}

.row {
  display: flex;
}

.grid-char {
  width: 1ch;
  text-align: center;
}

.grid-char.shooting-f {
  text-shadow: 0 0 0.3em currentColor;
  transition: color 0.1s, text-shadow 0.1s;
}

.grid-char.explosion-char {
  animation: explode 0.5s ease-out;
}

.grid-char.blink-crt-red {
  animation: blinkCrtRed 0.5s ease-out infinite;
}

@keyframes explode {
  0% {
    color: var(--color-green);
    text-shadow: 0 0 0.2em currentColor;
  }
  50% {
    color: var(--color-white);
    text-shadow: 0 0 0.5em currentColor;
  }
  100% {
    color: var(--color-green);
    text-shadow: 0 0 0.2em currentColor;
  }
}

@keyframes blinkCrtRed {
  0% {
    color: var(--color-green);
  }
  50% {
    color: var(--crt-red);
  }
  100% {
    color: var(--color-green);
  }
}

footer {
  padding: 1ch;
  color: var(--color-green);
  font-family: var(--font-mono);
  font-size: 1ch;
}

p {
  margin-top: 1.5ch;
  line-height: var(--line-height);
}

a {
  color: var(--color-green-light);
  font-weight: bold;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

hr {
  background: var(--color-green-darker);
  height: 1px;
  margin: 2ch 0;
}

.fade-out {
  opacity: 0;
  transition: opacity 0.3s ease-out;
}

#briefing {
  display: none;
}

#log-container {
  position: relative;
  margin-top: 1em;
}

#special-message {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  white-space: pre;
  font-family: var(--font-mono);
  color: var(--color-red);
}

#special-message.blink {
  animation: blink 0.3s step-start infinite;
}

#noise-overlay.low-noise {
  opacity: 0.25;
  animation: noise-move 1s linear infinite;
}

.grid-char.overlap {
  color: var(--color-green-dark);
  text-shadow: 0 0 0.4em currentColor;
}

.level-10 {
  color: var(--color-orange);
  background: radial-gradient(circle at center, rgb(52, 36, 24) 0%, #000 150%);
  text-shadow: 0 0 0.2em currentColor;
}

.level-10 .scanline {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: rgba(255, 165, 51, 0.2);
  top: 0;
  animation: scan-moving 6s linear infinite, scan-flicker 0.5s infinite alternate;
  pointer-events: none;
  z-index: 4;
  box-shadow: 0 0 40px rgba(255, 165, 51, 0.9), 0 -10px 40px rgba(255, 165, 51, 1),
    0 -20px 40px rgba(255, 165, 51, 0.99), 0 -30px 40px rgba(255, 165, 51, 0.98), 0 -40px 40px rgba(255, 165, 51, 0.97),
    0 -50px 40px rgba(255, 165, 51, 0.96), 0 -60px 40px rgba(255, 165, 51, 0.95), 0 -70px 40px rgba(255, 165, 51, 0.94),
    0 -80px 40px rgba(255, 165, 51, 0.93), 0 -90px 40px rgba(255, 165, 51, 0.92), 0 -100px 40px rgba(255, 165, 51, 0.9),
    0 -110px 40px rgba(255, 165, 51, 0.88), 0 -120px 40px rgba(255, 165, 51, 0.86),
    0 -130px 40px rgba(255, 165, 51, 0.84), 0 -140px 40px rgba(255, 165, 51, 0.82),
    0 -150px 40px rgba(255, 165, 51, 0.8), 0 -160px 40px rgba(255, 165, 51, 0.78),
    0 -170px 40px rgba(255, 165, 51, 0.76), 0 -180px 40px rgba(255, 165, 51, 0.74),
    0 -190px 40px rgba(255, 165, 51, 0.72), 0 -200px 40px rgba(255, 165, 51, 0.7),
    0 -210px 40px rgba(255, 165, 51, 0.68), 0 -220px 40px rgba(255, 165, 51, 0.66),
    0 -230px 40px rgba(255, 165, 51, 0.64), 0 -240px 40px rgba(255, 165, 51, 0.62),
    0 -250px 40px rgba(255, 165, 51, 0.6), 0 -260px 40px rgba(255, 165, 51, 0.58),
    0 -270px 40px rgba(255, 165, 51, 0.56), 0 -280px 40px rgba(255, 165, 51, 0.54),
    0 -290px 40px rgba(255, 165, 51, 0.52), 0 -300px 40px rgba(255, 165, 51, 0.5),
    0 -310px 40px rgba(255, 165, 51, 0.48), 0 -320px 40px rgba(255, 165, 51, 0.46),
    0 -330px 40px rgba(255, 165, 51, 0.44), 0 -340px 40px rgba(255, 165, 51, 0.42),
    0 -350px 40px rgba(255, 165, 51, 0.4), 0 -360px 40px rgba(255, 165, 51, 0.38),
    0 -370px 40px rgba(255, 165, 51, 0.36), 0 -380px 40px rgba(255, 165, 51, 0.34),
    0 -390px 40px rgba(255, 165, 51, 0.32), 0 -400px 40px rgba(255, 165, 51, 0.3),
    0 -410px 40px rgba(255, 165, 51, 0.28), 0 -420px 40px rgba(255, 165, 51, 0.26),
    0 -430px 40px rgba(255, 165, 51, 0.24), 0 -440px 40px rgba(255, 165, 51, 0.22),
    0 -450px 40px rgba(255, 165, 51, 0.2), 0 -460px 40px rgba(255, 165, 51, 0.18),
    0 -470px 40px rgba(255, 165, 51, 0.16), 0 -480px 40px rgba(255, 165, 51, 0.14),
    0 -490px 40px rgba(255, 165, 51, 0.12), 0 -500px 40px rgba(255, 165, 51, 0.1);
}

.level-10 .grid-char.blink-crt-red {
  animation: blinkCrtOrange 0.5s ease-out infinite;
}

@keyframes blinkCrtOrange {
  0% {
    color: var(--color-orange);
  }
  50% {
    color: var(--color-magenta);
  }
  100% {
    color: var(--color-orange);
  }
}

.level-10 header,
.level-10 footer {
  color: var(--color-orange);
}

.level-10 a {
  color: var(--color-orange-light);
}

.level-10 hr {
  background: var(--color-orange-darker);
}

.level-10 .grid-char.overlap {
  color: var(--color-orange-dark);
  text-shadow: 0 0 0.4em currentColor;
}

.level-10 #special-message {
  color: var(--color-magenta);
}

.level-10 .blinking {
  animation: blinkAnimationOrange 0.1s;
}

@keyframes blinkAnimationOrange {
  0% {
    color: var(--color-orange);
  }
  50% {
    color: var(--color-white);
  }
  100% {
    color: var(--color-orange);
  }
}

.level-10 .char {
  animation: ghostFadeOrange 0.15s ease-out forwards;
}

@keyframes ghostFadeOrange {
  to {
    color: var(--color-orange);
    text-shadow: 0 0 0.3em currentColor;
  }
  from {
    color: rgba(255, 165, 0, 0.2);
    text-shadow: 0 0 0.1em currentColor;
  }
}

.level-10 .cursor {
  color: var(--color-orange);
}

.level-10 .grid-char.explosion-char {
  animation: explodeOrange 0.5s ease-out;
}

@keyframes explodeOrange {
  0% {
    color: var(--color-orange);
    text-shadow: 0 0 0.2em currentColor;
  }
  50% {
    color: var(--color-white);
    text-shadow: 0 0 0.5em currentColor;
  }
  100% {
    color: var(--color-orange);
    text-shadow: 0 0 0.2em currentColor;
  }
}

.easter-egg-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background: radial-gradient(circle at 30% 70%, rgba(0, 255, 127, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 70% 30%, rgba(255, 20, 147, 0.1) 0%, transparent 40%);
}

#mute-container {
  margin: 0 auto;
  width: 138ch;
  max-width: 90vw;
  display: flex;
  justify-content: flex-end;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  margin-top: 1ch;
}

#mute-checkbox {
  color: var(--color-green-dark);
  background: none;
  text-shadow: none;
}

#mute-checkbox.level-10 {
  color: var(--color-orange-dark);
}

#mobile-message {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  color: var(--color-green);
  font-family: var(--font-mono);
  font-size: 24px;
  z-index: 1000;
  display: none;
  justify-content: center;
  align-items: center;
  text-align: center;
  user-select: none;
  padding: 20px;
  box-sizing: border-box;
  line-height: var(--line-height);
}

@media (max-width: 768px) {
  #mobile-message {
    display: flex;
  }
}