* {
  box-sizing: border-box;
}

:root {
    --color-primary: #333;
    --color-secondary: lightblue;
    --color-tertiary: #555;
    /* https://css-tricks.com/linearly-scale-font-size-with-css-clamp-based-on-the-viewport/ */
    --font-size: clamp(1rem, 0.1818rem + 3.6364vw, 1.75rem);
}

body {
  background-color: var(--color-primary);
  color: lightblue;
  font-family: "Courier New", Courier, monospace;
  font-size: var(--font-size);
  max-width: 810px;
  padding: 0 0.5em;
  margin: 0 auto;
}

h1, h2, h3 {
    margin: 0;
}

button {
    background-color: var(--color-tertiary);
    border: 1px solid lightblue;
    color: var(--color-secondary);
    cursor: pointer;
    font-family: "Courier New", Courier, monospace;
    font-size: var(--font-size);
    margin: 0.25em;
    padding: 0.25em;
}

input {
    background-color: var(--color-tertiary);
    border: 1px solid var(--color-secondary);
    color: lightblue;
    font-family: "Courier New", Courier, monospace;
    font-size: var(--font-size);
    margin: 0.25em;
    padding: 0.25em;
}

select {
    background-color: var(--color-tertiary);
    border: 1px solid var(--color-secondary);
    color: lightblue;
    font-family: "Courier New", Courier, monospace;
    font-size: var(--font-size);
    margin: 0.25em;
    padding: 0.25em;
}

a, a:visited {
    color: var(--color-secondary);
}

.hidden {
    display: none;
}

input.plain:not(:focus) {
    border: none;
    background-color: transparent;
    font-size: inherit;
    font-family: inherit;
    color: inherit;
    padding: 0;
    outline: none;
    appearance: textfield;
}

input.plain:focus + .editable-pencil {
    display: none;
}

.clock {
    width: 2ch;
    margin: 0;
    text-align: right;
}

.clock:focus {
    width: 4ch;
}

.clock::-webkit-inner-spin-button,
.clock::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.clock:focus::-webkit-inner-spin-button,
.clock:focus::-webkit-outer-spin-button {
    -webkit-appearance: auto;
}

.editable-pencil {
    display: inline-block;
    transform: rotate(90deg);
    cursor: pointer;
}

.pointer {
    cursor: pointer;
}

.relative-container {
    position: relative;
}

.overlay {
    position: absolute;
    top: -1em;
    left: 0;
    width: 100%;
    height: 250%;
    z-index: 99;
    cursor: pointer;
}

.clock-input {
    width: 2.5em;
}

dialog.modal {
    background-color: var(--color-primary);
    color: lightblue;
    border-radius: 0.5em;
    padding: 1em;
    width: 100%;
    max-width: 800px;
    overflow: auto;
}

dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.5);
}

.inline {
    display: inline-block;
}

button.naked {
    background-color: transparent;
    border: none;
    color: inherit;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    margin: 0;
    padding: 0;
}

small {
    font-size: 0.5em;
}