/* =========================================================
   Bilimsel Hesap Makinesi stilleri
   ========================================================= */
.calc-wrap {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 22px;
  align-items: start;
}

/* ---- Hesap makinesi ---- */
.calc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.calc__screen {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 14px;
}
.calc__expr {
  width: 100%;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  outline: none;
}
.calc__expr::placeholder { color: var(--text-mute); }
.calc__result {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--accent-2);
  margin-top: 8px;
  min-height: 32px;
  word-break: break-all;
}
.calc__result--err { color: var(--accent-3); font-size: 1rem; font-weight: 500; }
.calc__mem {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  min-height: 16px;
  margin-top: 4px;
}

.calc__actions {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 7px;
  margin-bottom: 10px;
}
.calc__sci {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 7px;
  margin-bottom: 10px;
}
.calc__basic {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.ckey {
  padding: 13px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--trans);
  font-family: var(--font-sans);
}
.ckey { position: relative; }
.ckey:hover { border-color: var(--accent); transform: translateY(-1px); z-index: 100; }
.ckey:active { transform: translateY(0); }

/* İpucu baloncuğu */
.ckey[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  top: calc(100% + 9px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  width: max-content;
  max-width: 210px;
  white-space: normal;
  text-align: left;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: 9px;
  padding: 8px 11px;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 500;
  line-height: 1.45;
  box-shadow: var(--shadow);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
}
.ckey[data-tip]::before {
  content: "";
  position: absolute;
  top: calc(100% + 3px);
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-bottom-color: var(--accent);
  z-index: 91;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s;
}
.ckey[data-tip]:hover::after { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); transition-delay: 0.3s; }
.ckey[data-tip]:hover::before { opacity: 1; visibility: visible; transition-delay: 0.3s; }
.ckey--fn { background: var(--bg-soft); color: var(--text-dim); font-size: 0.82rem; font-family: var(--font-mono); padding: 12px 0; }
.calc__sci .ckey { padding: 11px 0; }
.ckey--mem { background: var(--bg-soft); color: var(--accent); font-size: 0.82rem; font-family: var(--font-mono); padding: 10px 0; }
.ckey--op { color: var(--accent); font-size: 1.2rem; }
.ckey--warn { color: var(--accent-3); }
.ckey--mode { color: var(--accent-2); font-family: var(--font-mono); }
.ckey--eq {
  background: linear-gradient(135deg, var(--accent), #8a6cff);
  color: #fff; border: none; font-size: 1.3rem;
  box-shadow: 0 6px 18px var(--glow);
}
.ckey--eq:hover { color: #fff; }

/* ---- Geçmiş paneli ---- */
.calc-history {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 110px);
  display: flex;
  flex-direction: column;
}
.calc-history__head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px; font-weight: 700;
}
.calc-history__head small { color: var(--text-mute); font-weight: 400; font-family: var(--font-mono); }
.calc-history__clear {
  background: none; border: 1px solid var(--border); color: var(--text-dim);
  font-size: 0.8rem; padding: 5px 10px; border-radius: 8px; cursor: pointer; transition: var(--trans);
}
.calc-history__clear:hover { border-color: var(--accent-3); color: var(--accent-3); }
.calc-history__list {
  list-style: none; margin: 0; padding: 0;
  overflow-y: auto; flex: 1;
}
.hitem {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: var(--trans);
}
.hitem:hover { border-color: var(--accent); background: var(--surface-2); }
.hitem__expr {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  word-break: break-all;
}
.hitem__eq {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-2);
  margin-top: 2px;
}
.calc-history__hint { color: var(--text-mute); font-size: 0.85rem; }

@media (max-width: 800px) {
  .calc-wrap { grid-template-columns: 1fr; }
  .calc-history { position: static; max-height: 320px; }
}