:root {
  --bg-page: #eef0f3;
  --cream: #fdf6ee;
  --cream-dark: #f7ecdf;
  --key: #fbf3e8;
  --key-shadow: #e7d9c4;
  --orange: #e0974a;
  --orange-dark: #c97f33;
  --pink: #f6dede;
  --pink-text: #d98a8a;
  --text: #4a4339;
  --text-soft: #a99c89;
}
* {
  box-sizing: border-box;
}

/* Launcher button */
#calc-launcher {
}
#calc-launcher:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(201, 127, 51, 0.5);
}
#calc-launcher:active {
  transform: translateY(0);
}

/* Calculator window */
#calc-window {
  position: fixed;
  bottom: 104px;
  right: 32px;
  width: 320px;
  background: var(--cream);
  border-radius: 20px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.18);
  overflow: hidden;
  display: none;
  flex-direction: column;
  z-index: 1000;
  border: 1px solid #f0e4d2;
}
#calc-window.open {
  display: flex;
}

/* Title bar */
#calc-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  cursor: move;
  user-select: none;
  background: var(--cream);
  border-bottom: 1px solid #f0e4d2;
}
#calc-titlebar .title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
  font-weight: 600;
}
#calc-titlebar .grip {
  letter-spacing: 1px;
  color: var(--text-soft);
  font-size: 12px;
}
#calc-titlebar .win-controls {
  display: flex;
  gap: 14px;
  align-items: center;
  color: var(--text-soft);
  font-size: 14px;
}
#calc-titlebar .win-controls span {
  cursor: pointer;
}
#calc-titlebar .win-controls .close-btn {
  cursor: pointer;
  font-size: 16px;
}
#calc-titlebar .win-controls .close-btn:hover {
  color: #c0564f;
}

/* Display */
#calc-display {
  padding: 18px 22px 10px;
  text-align: right;
  font-size: 38px;
  font-weight: 300;
  color: var(--text);
  background: var(--cream);
  min-height: 54px;
  word-break: break-all;
  overflow-x: auto;
}
#calc-subdisplay {
  text-align: right;
  padding: 0 22px;
  font-size: 13px;
  color: var(--text-soft);
  min-height: 16px;
}

/* Keypad */
#calc-keys {
  background: var(--cream-dark);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.rowx {
  display: grid;
  gap: 8px;
}
.rowx.cols-5 {
  grid-template-columns: repeat(5, 1fr);
}
.rowx.cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

button.key {
  border: none;
  border-radius: 14px;
  padding: 13px 0;
  font-size: 15px;
  color: var(--text);
  background: var(--key);
  cursor: pointer;
  box-shadow: 0 2px 0 var(--key-shadow);
  transition:
    transform 0.08s ease,
    box-shadow 0.08s ease;
}
button.key:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 var(--key-shadow);
}
button.key.num {
  background: #ffffff;
  font-size: 17px;
}
button.key.op {
  background: var(--orange);
  color: #fff;
  font-weight: 600;
}
button.key.op:active {
  box-shadow: 0 0 0 var(--orange-dark);
}
button.key.ac {
  background: var(--pink);
  color: var(--pink-text);
  font-weight: 600;
}
button.key.equals {
  background: var(--orange-dark);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
}
button.key.wide {
  grid-column: span 2;
}
button.key.active-toggle {
  background: var(--orange);
  color: #fff;
}

.empty-hint {
  color: var(--text-soft);
  font-size: 14px;
  text-align: center;
  max-width: 260px;
}