:root {
  --green: #33ff77;        /* основной зелёный */
  --green-bright: #9dffc2; /* яркие акценты / :hover */
  --green-dim: #1f9c52;    /* второстепенный текст */
  --green-faint: rgba(51, 255, 119, 0.09);
  --line: rgba(51, 255, 119, 0.30);
  --red: #ff5252;
  --mono: "SFMono-Regular", "JetBrains Mono", "Menlo", "Consolas", "DejaVu Sans Mono", "Courier New", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--mono);
  color: var(--green);
  background: #000;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  overflow-x: hidden;
}

/* Статический фон: мягкое зелёное свечение сверху + лёгкие CRT-строки (без анимации) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 50% -10%, rgba(51, 255, 119, 0.12), rgba(0, 0, 0, 0) 55%),
    repeating-linear-gradient(rgba(0, 0, 0, 0) 0 2px, rgba(0, 0, 0, 0.35) 3px 4px);
}

/* Кратковременная зелёная вспышка при верном ответе */
#flash {
  position: fixed;
  inset: 0;
  z-index: 40;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle at 50% 45%, rgba(51, 255, 119, 0.30), rgba(0, 0, 0, 0) 65%);
}
#flash.go { animation: flashfade .7s ease-out; }
@keyframes flashfade {
  0%   { opacity: 0; }
  18%  { opacity: 1; }
  100% { opacity: 0; }
}

.status {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 60;
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.6);
  color: var(--green);
  transition: opacity .4s;
}
.status.ok { opacity: 0; }

.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 560px;
  background: rgba(0, 12, 5, 0.78);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 0 0 1px rgba(51, 255, 119, 0.08), 0 0 40px rgba(51, 255, 119, 0.12);
  padding: 34px 30px 38px;
  backdrop-filter: blur(2px);
}

.screen { text-align: center; }
.hidden { display: none; }

.emoji-big {
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 20px;
  color: var(--green);
  text-shadow: 0 0 12px rgba(51, 255, 119, 0.7);
  letter-spacing: .05em;
}
.emoji-big.blink { animation: blink 1.1s steps(1) infinite; }

.intro {
  font-size: 16px;
  line-height: 1.65;
  color: var(--green);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  text-align: left;
  margin: 0 0 30px;
}
.intro::before {
  content: "> ";
  color: var(--green-dim);
}

/* метка над вопросом: [ ВОПРОС 2 · 5 ] */
.progress {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--green);
  border: 1px solid var(--line);
  padding: 5px 12px;
  border-radius: 4px;
  margin-bottom: 22px;
}
.progress::before { content: "["; margin-right: 8px; color: var(--green-dim); }
.progress::after  { content: "]"; margin-left: 8px; color: var(--green-dim); }

.question {
  font-size: clamp(18px, 4.6vw, 23px);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: .005em;
  margin: 0 0 12px;
  color: var(--green);
  text-align: left;
  overflow-wrap: anywhere;
  text-shadow: 0 0 10px rgba(51, 255, 119, 0.35);
}

.format {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green-dim);
  margin-bottom: 24px;
  text-align: left;
}
.format:not(:empty)::before { content: "// ответ — "; }

#answer-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.answer-input {
  width: 100%;
  font-family: var(--mono);
  font-size: 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  outline: none;
  color: var(--green);
  background: rgba(0, 20, 8, 0.6);
  caret-color: var(--green);
  transition: border-color .18s, box-shadow .18s;
  text-align: left;
}
.answer-input::placeholder { color: var(--green-dim); }
.answer-input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(51, 255, 119, 0.18), 0 0 16px rgba(51, 255, 119, 0.2);
}
.answer-input.shake { animation: shake .4s; border-color: var(--red); box-shadow: 0 0 0 3px rgba(255, 82, 82, .2); }

.btn {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--green);
  background: transparent;
  border: 1px solid var(--green);
  border-radius: 6px;
  padding: 14px 22px;
  cursor: pointer;
  transition: background .15s, color .15s, box-shadow .15s, transform .08s;
}
.btn:hover {
  background: var(--green);
  color: #001a08;
  box-shadow: 0 0 20px rgba(51, 255, 119, 0.5);
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .4; cursor: default; box-shadow: none; background: transparent; color: var(--green-dim); border-color: var(--green-dim); }

.feedback {
  min-height: 22px;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
}
.feedback.err { color: var(--red); text-shadow: 0 0 8px rgba(255, 82, 82, .5); }
.feedback.ok { color: var(--green-bright); }

.hints {
  margin-top: 26px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.hint {
  background: var(--green-faint);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--green);
  overflow-wrap: anywhere;
}
.hint::before { content: "// подсказка: "; color: var(--green-dim); }

.hint-timer {
  margin-top: 18px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--green-dim);
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0.15; }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}