/* ===== Химический калькулятор (Apple Glass) ===== */

.calc-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.72);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.calc-modal {
  width: min(720px, 94vw);
  max-height: 92vh;
  overflow-y: auto;
  border-radius: 26px;
  padding: 1.6rem 1.8rem 1.5rem;
  background: radial-gradient(circle at top left, rgba(255,255,255,0.98), rgba(226,232,240,0.96));
  box-shadow:
    0 26px 70px rgba(15,23,42,0.55),
    0 0 0 1px rgba(255,255,255,0.9) inset;
  position: relative;
}

.calc-title {
  margin: 0 0 0.8rem;
  font-size: 1.4rem;
  background: linear-gradient(135deg, #6b48ff, #4ecdc4);
  -webkit-background-clip: text;
  color: transparent;
}

.calc-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  background: radial-gradient(circle at top left, #ffffff, #e5e7eb);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.9),
    0 12px 25px rgba(15,23,42,0.3);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.calc-modes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
}

.calc-mode-btn {
  flex: 1 1 calc(50% - 0.4rem);
  border-radius: 999px;
  border: 1px solid rgba(148,163,184,0.6);
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  cursor: pointer;
  background: rgba(255,255,255,0.9);
  color: #111827;
  text-align: center;
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.1s ease, border-color 0.2s;
}

.calc-mode-btn:hover {
  background: #f1f5f9;
  transform: translateY(-1px);
}

.calc-mode-btn.active {
  background: linear-gradient(135deg, #6b48ff, #4ecdc4);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 12px 25px rgba(79,70,229,0.4);
}

.calc-content {
  margin-top: 0.4rem;
}

.calc-input, .calc-select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  border-radius: 12px;
  border: 1px solid rgba(148,163,184,0.7);
  background: rgba(255,255,255,0.9);
  margin: 0.35rem 0;
  font-size: 0.9rem;
}

.calc-run-btn {
  width: 100%;
  margin-top: 0.6rem;
  padding: 0.7rem 0.8rem;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  background: linear-gradient(135deg, #6b48ff, #4ecdc4);
  color: #f9fafb;
  box-shadow: 0 16px 40px rgba(79,70,229,0.45);
}

.calc-results {
  margin-top: 0.9rem;
  padding: 0.8rem 0.9rem;
  border-radius: 16px;
  background: rgba(15,23,42,0.92);
  color: #e5e7eb;
  font-size: 0.9rem;
  white-space: pre-wrap;
}


.history-toggle {
  margin-top: 0.8rem;
  width: 100%;
  border-radius: 999px;
  border: none;
  background: rgba(148,163,184,0.18);
  padding: 0.45rem 0.8rem;
  font-size: 0.8rem;
  cursor: pointer;
  color: #7d7f81;
}

.calc-history {
  margin-top: 0.5rem;
  max-height: 180px;
  overflow-y: auto;
  border-radius: 16px;
  padding: 0.6rem 0.8rem;
  background: rgba(15,23,42,0.92);
  border: 1px solid rgba(148,163,184,0.55);
}

/* ===== ЯРКИЙ, ВИДИМЫЙ, АККУРАТНЫЙ СКРОЛЛБАР ДЛЯ КАЛЬКУЛЯТОРА ===== */

/* Общие настройки, чтобы скроллбар оставался ВНУТРИ модального окна */
.calc-modal {
    overflow-y: auto;
    scrollbar-gutter: stable both-edges;
    border-radius: 26px; /* важно чтобы трек повторял радиус родителя */
}

/* Более видимый скроллбар */
.calc-modal::-webkit-scrollbar {
    width: 12px; /* толще и заметнее */
}

.calc-modal::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.28);
    border-radius: 26px; /* трек не вылезает за края */
    margin: 8px; /* сдвиг внутрь, чтобы не упирался в край */
}

.calc-modal::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #7c5aff, #4ecdc4);
    border-radius: 20px;
    border: 3px solid rgba(255,255,255,0.55); /* создаёт эффект "внутри" */
}

.calc-modal::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #8d6cff, #6ff5dd);
}


/* ===== СКРОЛЛБАР ИСТОРИИ — более видимый и внутри границ ===== */

.calc-history {
    overflow-y: auto;
    scrollbar-gutter: stable both-edges;
    border-radius: 16px;
}

.calc-history::-webkit-scrollbar {
    width: 10px;
}

.calc-history::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.18);
    border-radius: 16px;
    margin: 6px;
}

.calc-history::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.65);
    border-radius: 16px;
    border: 2px solid rgba(255,255,255,0.35);
}

.calc-history::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.85);
}

.calc-history {
    color: #e2e8f0 !important; /* приятный светло-серый */
}