/* RESET */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: "Pretendard", sans-serif;
  color: white;
  line-height: 1.5;

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

input {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md); /* .btn과 동일 */
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-lg);
  font-family: inherit;
  margin-bottom: 0.5rem;
}

input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

ul {
  width: 300px;
  list-style: none;
}

li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem;
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  color: white;
  font-weight: 300;
  font-size: var(--font-size-lg);
}

/* VARIABLES */
:root {
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radiux-lg: 16px;
}

/* LAYOUT */
body {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  min-height: 100vh;
}

/* COMPONENTS */
.text {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-lg);
  font-weight: 300;
  -webkit-text-stroke: 4px rgba(0, 0, 0, 0.2);
  display: flex;
  gap: var(--spacing-md);
}

.btn {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-lg);
  font-weight: 300;
}

#clock {
  font-size: 6rem;
  font-weight: 700;
  -webkit-text-stroke: 4px rgba(0, 0, 0, 0.3);
}

#greeting {
  color: white;
  font-size: 2rem;
  font-weight: 500;
}

#input-todo {
  text-align: center;
}

#btn-todo {
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  padding: var(--spacing-xs);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--font-size-md);
}

#random-quote {
  position: fixed;
  bottom: 2rem;
  text-align: center;
}

#credit {
  position: fixed;
  bottom: 1rem;
  right: 1rem;

  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* UTILITIES */
.hidden {
  display: none;
}