:root {
  /* без искусственных отступов */
}

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

body {
  font-family: "Segoe UI", sans-serif;
  background: #eef2ff;
  color: #222;

  display: flex;
  flex-direction: column;
  align-items: center;

  margin: 0;

  /* правильная высота на мобилках */
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;

  /* только safe-area, без "припасов" */
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* ---------- HEADER ---------- */

header.topbar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;

  background: #4f46e5;
  color: white;

  padding: 0.6rem 1rem;
  box-shadow: 0 2px 6px rgba(0,0,0,.15);
}

/* запрещаем переносы там, где он выглядит “как баг” */
.score-box,
.mode-btn {
  white-space: nowrap;
  flex: 0 0 auto;
}

.score-box {
  background: white;
  color: #4f46e5;
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  font-weight: bold;
  font-size: 1.1rem;

  display: flex;
  align-items: center;
  gap: 6px;

  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.score-box:active {
  transform: scale(0.96);
}

.mode-btn {
  background: #10b981;
  color: white;
  border: none;
  border-radius: 9999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
}

.mode-btn:active {
  background: #34d399;
}

.mode-btn:disabled {
  opacity: 0.95;
  cursor: default;
}


/* ---------- MAIN ---------- */

main {
  flex: 1 1 auto;
  width: 100%;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  padding-left: max(12px, env(safe-area-inset-left));
  padding-right: max(12px, env(safe-area-inset-right));
  padding-bottom: max(12px, env(safe-area-inset-bottom));

  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.task {
  font-size: 3rem;
  margin-bottom: 1rem;
  text-align: center;
}

.answer {
  font-size: 2rem;
  height: 2.5rem;
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: 0.2rem;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 80px);
  gap: 10px;
}

button {
  font-size: 1.8rem;
  padding: 15px;
  border-radius: 12px;
  border: none;
  background: #4f46e5;
  color: white;
}

button:active {
  background: #6366f1;
}

.feedback {
  font-size: 2rem;
  height: 2rem;
  margin-top: 0.5rem;
  text-align: center;
}

#statsBtn {
  cursor: pointer;
  border: none;
}

#statsBtn:active {
  transform: scale(0.97);
}

/* ---------- SUCCESS OVERLAY ---------- */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  backdrop-filter: blur(6px);
}

.overlay.hidden {
  display: none;
}

.overlay-card {
  width: min(540px, 92vw);
  background: white;
  border-radius: 22px;
  padding: 18px 16px 14px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
  text-align: center;
  transform: scale(0.98);
  animation: pop 180ms ease-out forwards;
}

/* Улучшенная статистика */
#statsOverlay .overlay-card {
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

#statsBody {
  overflow-y: auto;
  margin-top: 10px;
  padding-right: 6px;
}

/* аккуратный скролл */
#statsBody::-webkit-scrollbar {
  width: 6px;
}

#statsBody::-webkit-scrollbar-thumb {
  background: #c7d2fe;
  border-radius: 6px;
}


@keyframes pop {
  to {
    transform: scale(1);
  }
}

.overlay-title {
  font-size: 1.8rem;
  font-weight: 800;
  color: #111827;
  margin-bottom: 10px;
}

.overlay-sub {
  font-size: 1.05rem;
  color: #334155;
  margin-top: 8px;
}

/* ---------- DONUT ---------- */

.donut-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
}

.donut-svg {
  width: 190px;
  height: 190px;
}

.donut-seg {
  transition: opacity 220ms ease, transform 220ms ease;
  transform-origin: 95px 95px;
}

.donut-seg.filled {
  opacity: 1;
}

.donut-seg.empty {
  opacity: 0.18;
}

/* ---------- LANDSCAPE (мягкий) ---------- */

@media (orientation: landscape) {
  main {
    width: min(980px, 100%);
    padding: 10px 12px;

    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "task keypad"
      "answer keypad"
      "feedback keypad";

    column-gap: 16px;
    row-gap: 8px;

    place-content: center;
    align-items: center;
    justify-items: center;

    min-height: 0;
  }

  #task {
    grid-area: task;
    font-size: clamp(2rem, 4.2vw, 3rem);
    margin: 0;
  }

  #answer {
    grid-area: answer;
    font-size: clamp(1.4rem, 3.2vw, 2.2rem);
    margin: 0;
  }

  #feedback {
    grid-area: feedback;
    margin: 0;
  }

  #keypad {
    grid-area: keypad;
    grid-template-columns: repeat(3, 68px);
    gap: 8px;
  }

  #keypad button {
    font-size: 1.45rem;
    padding: 10px;
    border-radius: 12px;
  }
}

/**etc**/
.selected-piece{
  box-shadow: inset 0 0 0 4px #22c55e;
  background-color: rgba(34,197,94,0.25);
  transition: all 0.15s ease;
}

#chessBoard div{
  transition: transform 0.08s ease;
}

#chessBoard div:active{
  transform: scale(0.92);
}