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

/* Define light and dark theme colors */
:root {
  --background-gradient-start: #c4d2ef;
  --background-gradient-end: #dfe6f6;
  --text-color: #333;
  --number-color: #f9fbfd;
  --number-pop-color: #3e6ccb;
  --number-pop-bg: #dfe6f6;
  --number-pop-shadow-light: #f9fbfd;
  --number-pop-shadow-dark: #a9bee8;
  --strip-bg: #dfe6f6;
  --strip-shadow-light: #f9fbfd;
  --strip-shadow-dark: #a9bee8;
  --number-pop-bg-hover: rgba(0,0,0,0.05);

  /* Variables for the animated theme toggle dimensions and specific colors */
  --toggleHeight: 16em;
  --toggleWidth: 30em;
  --toggleBtnRadius: 10em;
  --bgColor--night: #423966;
  --mooncolor: #d9fbff;
}

body.dark-mode {
  --background-gradient-start: #232931;
  --background-gradient-end: #393e46;
  --text-color: #eeeeee;
  --number-color: #eeeeee;
  --number-pop-color: #00adb5;
  --number-pop-bg: #393e46;
  --number-pop-shadow-light: #4a4f58;
  --number-pop-shadow-dark: #1c2025;
  --strip-bg: #393e46;
  --strip-shadow-light: #4a4f58;
  --strip-shadow-dark: #1c2025;
  --number-pop-bg-hover: rgba(255,255,255,0.08);
}

body {
  font-family: 'Roboto Mono', monospace;
  font-size: 4vmin; 
  min-height: 100vh;
  display: grid;
  overflow: hidden;
  place-items: center;
  background: linear-gradient(-45deg, var(--background-gradient-start), var(--background-gradient-end));
  color: var(--text-color);
  transition: background 0.3s ease, color 0.3s ease;
  padding: 20px 0;
}

/* Controls at the top of the screen */
.top-controls {
  position: fixed;
  top: 20px;
  left: 0;
  right: 0;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  pointer-events: none;
}

.top-controls > * {
  pointer-events: auto;
}

/* Theme Toggle Button (TDNN) */
.tdnn {
  cursor: pointer;
  font-size: 7%;
  height: var(--toggleHeight);
  width: var(--toggleWidth);
  border-radius: var(--toggleHeight);
  transition: background 500ms ease-in-out;
  background: var(--bgColor--night);
  position: relative;
}

.tdnn.day {
  background: #ffbf71;
}

.moon {
  position: absolute;
  display: block;
  border-radius: 50%;
  transition: all 400ms ease-in-out;
  /* Initial position and appearance (moon) */
  top: 3em;
  left: 3em;
  transform: rotate(-75deg);
  width: var(--toggleBtnRadius);
  height: var(--toggleBtnRadius);
  background: var(--bgColor--night);
  box-shadow:
    3em 2.5em 0 0em var(--mooncolor) inset, /* Crescent shape */
    /* Subtle stars/dots around the moon */
    rgba(255, 255, 255, 0.1) 0em -7em 0 -4.5em,
    rgba(255, 255, 255, 0.1) 3em 7em 0 -4.5em,
    rgba(255, 255, 255, 0.1) 2em 13em 0 -4em,
    rgba(255, 255, 255, 0.1) 6em 2em 0 -4.1em,
    rgba(255, 255, 255, 0.1) 8em 8em 0 -4.5em,
    rgba(255, 255, 255, 0.1) 6em 13em 0 -4.5em,
    rgba(255, 255, 255, 0.1) -4em 7em 0 -4.5em,
    rgba(255, 255, 255, 0.1) -1em 10em 0 -4.5em;
}

.moon.sun {
  top: 4.5em;
  left: 18em;
  transform: rotate(0deg);
  width: 7em;
  height: 7em;
  background: #fff;
  box-shadow:
    3em 3em 0 5em #fff inset, /* Inner glow of the sun */
     /* Sun rays */
    0 -5em 0 -2.7em #fff,
    3.5em -3.5em 0 -3em #fff,
    5em 0 0 -2.7em #fff,
    3.5em 3.5em 0 -3em #fff,
    0 5em 0 -2.7em #fff,
    -3.5em 3.5em 0 -3em #fff,
    -5em 0 0 -2.7em #fff,
    -3.5em -3.5em 0 -3em #fff;
}

/* Mode Toggle Button*/
#modeToggleBtn {
  height: 4.2vmin;
  padding: 0 1.5vmin;
  font-family: 'Roboto Mono', monospace;
  font-size: 1.4vmin;
  color: var(--text-color);
  background-color: var(--strip-bg);
  border: 1px solid var(--text-color);
  border-radius: 1.4vmin;
  cursor: pointer;
  box-shadow: -0.5vmin -0.5vmin 1vmin -0.25vmin var(--strip-shadow-light), 0.5vmin 0.5vmin 1vmin var(--strip-shadow-dark);
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
  white-space: nowrap;
  margin: 0 auto;
}

/* Fullscreen Button*/
#fullscreenBtn {
  position: relative;
  height: 4.2vmin;
  padding: 0 1.2vmin;
  font-family: 'Roboto Mono', monospace;
  font-size: 1.4vmin;
  color: var(--text-color);
  background-color: var(--strip-bg);
  border: 1px solid var(--text-color);
  border-radius: 1.4vmin;
  cursor: pointer;
  box-shadow: -0.5vmin -0.5vmin 1vmin -0.25vmin var(--strip-shadow-light), 0.5vmin 0.5vmin 1vmin var(--strip-shadow-dark);
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  white-space: nowrap;
}

/* Main container for clock/timer display and timer controls */
.timer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4vmin;
}

.clock-display {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 8vmin;
  position: relative;
  padding: 0 4vmin;
  height: 8vmin;
}

.hour,
.minute,
.second {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 4vmin;
  align-items: start;
  height: 100%;
  overflow: hidden;
}

.strip {
  transition: transform 500ms ease-in-out, background-color 0.3s ease, box-shadow 0.3s ease;
  border-radius: 1.333333333333333vmin;
  background-color: var(--strip-bg);
  box-shadow: -1vmin -1vmin 2vmin -0.5vmin var(--strip-shadow-light), 1vmin 1vmin 2vmin var(--strip-shadow-dark);
}

.number {
  user-select: none;
  width: 8vmin;
  height: 8vmin;
  display: grid;
  place-items: center;
  color: var(--number-color);
  transition: all 500ms 100ms ease;
  border-radius: 50%;
}

/* Style for when numbers are clickable*/
.timer-container.timer-setting-mode .clock-display .number {
  cursor: pointer;
}

.timer-container.timer-setting-mode .clock-display .number:hover {
  background-color: var(--number-pop-bg-hover);
}


.number-pop {
  color: var(--number-pop-color);
  font-weight: bold;
  transform: scale(1.3);
  background-color: var(--number-pop-bg);
  box-shadow: -1vmin -1vmin 2vmin -0.5vmin var(--number-pop-shadow-light), 1vmin 1vmin 2vmin var(--number-pop-shadow-dark);
}

/* Timer Control Buttons*/
.timer-controls {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  display: flex;
  flex-direction: row;
  gap: 15px;
}

.timer-controls.hidden {
  display: none !important;
}

.timer-controls button {
  font-family: 'Roboto Mono', monospace;
  font-size: 2vmin;
  min-width: 100px;
  text-align: center;
  padding: 1.5vmin 2.5vmin;
  border: none;
  border-radius: 1vmin;
  cursor: pointer;
  background-color: var(--number-pop-color);
  color: var(--number-pop-bg);
  transition: background-color 0.3s ease, transform 0.2s ease;
  box-shadow: -0.5vmin -0.5vmin 1vmin -0.25vmin var(--strip-shadow-light), 0.5vmin 0.5vmin 1vmin var(--strip-shadow-dark);
}

.timer-controls button:hover {
  transform: translateY(-10px);
}

.timer-controls button:active {
  transform: translateY(4px);
}

:root:fullscreen .top-controls {
  padding: 0 30px; */
}
:root:fullscreen .top-controls > * {
 transform: scale(1.1);
}


:root:fullscreen .timer-controls {
  bottom: 40px;
  right: 40px;
}