.todoAdd{
  --h: 70px;
  --pad: 15px;
  --radius: 999px;
  --btn: 44px;

  width: min(860px, 92vw);
  height: var(--h);
  display:flex;
  align-items:center;
  margin: 0 auto;
  padding: var(--pad);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);

  background: color-mix(in srgb, var(--bg-card) 70%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);

  box-shadow:
    0 18px 36px rgba(0,0,0,0.14),
    inset 0 1px 0 rgba(255,255,255,0.60),
    inset 0 -3px 10px rgba(69,40,41,0.10);

  position: relative;
}

.todoAdd::after{
  content:"";
  position:absolute;
  left: 26px;
  right: calc(26px + var(--btn) + var(--pad));
  bottom: 14px;
  border-bottom: 2px dotted color-mix(in srgb, var(--color-border) 70%, transparent);
  opacity: .55;
  pointer-events:none;
}

.todoAdd__input{
  flex: 1;
  height: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  padding: 0 18px;

  color: var(--color-text-primary);

  /* 폰트는 base.css를 상속 */
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.2px;
}

.todoAdd__input::placeholder{
  color: color-mix(in srgb, var(--color-text-secondary) 55%, transparent);
  font-weight: 700;
}

.todoAdd__btn{
  width: var(--btn);
  height: var(--btn);
  border-radius: 999px;
  border: 0;
  cursor: pointer;
  display:grid;
  place-items:center;

  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-primary) 70%, white) 0%,
    var(--color-primary) 100%
  );
  color: #fff;

  box-shadow:
    0 12px 26px rgba(0,0,0,0.18),
    inset 0 1px 0 rgba(255,255,255,0.22),
    inset 0 -3px 10px rgba(0,0,0,0.18);

  transition: transform 120ms ease, filter 120ms ease, box-shadow 120ms ease;
}

.todoAdd__btn i{
  font-size: 18px;
  transform: translateY(-1px);
}

.todoAdd:focus-within{
  border-color: color-mix(in srgb, var(--color-primary) 30%, var(--color-border));
  box-shadow:
    0 20px 40px rgba(0,0,0,0.16),
    0 0 0 4px color-mix(in srgb, var(--color-accent) 22%, transparent),
    inset 0 1px 0 rgba(255,255,255,0.60),
    inset 0 -3px 10px rgba(69,40,41,0.10);
}

.todoAdd__btn:hover{ filter: brightness(1.04); }
.todoAdd__btn:active{
  transform: translateY(1px);
  box-shadow:
    0 9px 18px rgba(0,0,0,0.18),
    inset 0 2px 12px rgba(0,0,0,0.22);
}