:root {
  --bg: #0d2726;
  --bg-soft: #123634;
  --panel: #f5efe2;
  --panel-2: #fffaf0;
  --text: #17312f;
  --muted: #6c7b76;
  --accent: #2f8f83;
  --accent-dark: #1d665f;
  --gold: #dca949;
  --danger: #c75a4a;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(64, 170, 155, .22), transparent 32%),
    radial-gradient(circle at bottom right, rgba(220, 169, 73, .14), transparent 28%),
    linear-gradient(145deg, var(--bg), #081a19 70%);
  color: var(--white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.game-shell { width: min(760px, 100%); }

.screen { display: none; }
.screen.active { display: block; animation: fadeIn .28s ease; }

.panel {
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  color: var(--text);
  border: 1px solid rgba(255,255,255,.7);
  border-radius: 26px;
  padding: clamp(24px, 5vw, 46px);
  box-shadow: var(--shadow);
  text-align: center;
}

.brand-mark { font-size: 4rem; filter: drop-shadow(0 8px 10px rgba(0,0,0,.12)); }
.eyebrow { text-transform: uppercase; letter-spacing: .13em; font-weight: 800; font-size: .78rem; color: var(--accent-dark); }
h1 { margin: 8px 0 12px; font-size: clamp(2.2rem, 7vw, 4.5rem); line-height: .95; }
.lead { margin: 0 auto 26px; max-width: 520px; color: var(--muted); font-size: 1.05rem; }

.how-to {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 24px 0;
}

.how-to span {
  background: rgba(47, 143, 131, .09);
  border: 1px solid rgba(47, 143, 131, .15);
  border-radius: 14px;
  padding: 14px 10px;
  font-weight: 700;
  font-size: .9rem;
}

.primary-btn, .answer-btn {
  border: 0;
  cursor: pointer;
  font: inherit;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}

.primary-btn {
  background: linear-gradient(180deg, #3da99c, var(--accent-dark));
  color: white;
  font-weight: 900;
  padding: 15px 28px;
  border-radius: 14px;
  box-shadow: 0 10px 22px rgba(29, 102, 95, .28);
  font-size: 1.05rem;
}
.primary-btn:hover { transform: translateY(-2px); }
.primary-btn:active { transform: translateY(0); }
.best-line { color: var(--muted); margin-bottom: 0; }

.hud {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

.hud-card {
  border-radius: 17px;
  padding: 13px 10px;
  text-align: center;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.13);
  backdrop-filter: blur(10px);
}
.hud-card span { display: block; opacity: .72; font-size: .75rem; text-transform: uppercase; letter-spacing: .12em; }
.hud-card strong { display: block; font-size: 1.55rem; margin-top: 2px; }
.timer-card strong.warning { color: #ffd37a; }
.timer-card strong.danger { color: #ff8d7d; animation: pulse .55s infinite alternate; }

.repair-card { position: relative; overflow: hidden; min-height: 490px; }
.repair-card::after {
  content: "";
  position: absolute;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  right: -120px;
  top: -120px;
  background: rgba(47,143,131,.08);
  pointer-events: none;
}

.appliance-icon { font-size: clamp(5rem, 18vw, 8.5rem); margin: 10px 0 4px; }
h2 { font-size: clamp(1.7rem, 5vw, 2.6rem); margin: 8px 0; }
.instruction { color: var(--muted); margin-top: 0; }

.answer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}
.answer-btn {
  background: white;
  color: var(--text);
  border: 2px solid rgba(23,49,47,.1);
  border-radius: 15px;
  padding: 15px 18px;
  font-weight: 800;
  box-shadow: 0 7px 16px rgba(23,49,47,.07);
}
.answer-btn:hover { transform: translateY(-2px); border-color: rgba(47,143,131,.45); }
.answer-btn.correct { background: #dff5ea; border-color: #4ba875; }
.answer-btn.wrong { background: #fae2df; border-color: var(--danger); }
.answer-btn:disabled { cursor: default; }

.feedback {
  min-height: 28px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--accent-dark);
}
.feedback.bad { color: var(--danger); }

.progress-wrap {
  margin-top: 14px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.1);
  overflow: hidden;
}
.time-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--gold), #73c9b5);
  transition: width .2s linear;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 24px 0;
}
.results-grid div {
  background: rgba(47,143,131,.08);
  padding: 18px 12px;
  border-radius: 15px;
}
.results-grid span { display: block; color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .09em; }
.results-grid strong { display: block; font-size: 1.8rem; margin-top: 4px; }
.new-best { min-height: 24px; color: var(--accent-dark); font-weight: 900; }

footer { opacity: .55; font-size: .78rem; margin-top: 18px; text-align: center; }

.shake { animation: shake .28s linear; }
.pop { animation: pop .22s ease; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes pulse { from { transform: scale(1); } to { transform: scale(1.08); } }
@keyframes pop { 50% { transform: scale(1.045); } }
@keyframes shake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-7px); } 75% { transform: translateX(7px); } }

@media (max-width: 620px) {
  body { padding: 14px; justify-content: flex-start; }
  .game-shell { margin-top: 18px; }
  .panel { border-radius: 20px; padding: 24px 18px; }
  .how-to { grid-template-columns: 1fr; }
  .repair-card { min-height: 470px; }
  .hud { gap: 8px; }
  .hud-card strong { font-size: 1.25rem; }
}