:root,
::backdrop {
  --color-primary: hsl(348, 83%, 55%);
  --color-primary: crimson;
  --color-primary-hover: hsl(348, 83%, 45%);
  --color-primary-alpha: hsla(348, 100%, 55%, 0.2);
  --color-secondary: white;
  --color-secondary-hover: rgba(0, 0, 0, 0.05);

  --color-text: #383838;
  --color-input-bg: hsl(0, 0%, 100%);
  --color-border: #ccc;
  --color-border-light: #e9e9e9;

  --color-shadow: rgba(0, 0, 0, 0.1);
}

/* Darkmode */
:root.dark,
:root.dark ::backdrop {
  --color-primary: hsl(348, 83%, 55%);
  --color-primary: crimson;
  --color-primary-hover: hsl(348, 83%, 60%);
  --color-primary-alpha: hsla(348, 100%, 65%, 0.4);
  --color-secondary: hsl(0, 0%, 10%);
  --color-secondary-hover: rgba(255, 255, 255, 0.1);

  --color-text: #eee;
  --color-input-bg: hsl(0, 0%, 15%);
  --color-border: #555;
  --color-border-light: #444;

  --color-shadow: rgba(0, 0, 0, 0.3);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  border: none;
  font-family: "Roboto", Sans-Serif;
  color: var(--color-text);
  accent-color: var(--color-text);
  outline-color: var(--color-text);
}

::selection {
  background-color: var(--color-primary-alpha);
}

.preload-transitions *,
.preload-transitions *::before,
.preload-transitions *::after {
  -webkit-transition: none !important;
  -moz-transition: none !important;
  -ms-transition: none !important;
  -o-transition: none !important;
  transition: none !important;
}

html {
  color-scheme: light dark;
  font-size: 62.5%;
}

body {
  width: 100%;
  font-size: 1.6rem;
  background-color: var(--color-secondary);
  overflow-y: scroll;
}

header {
  width: 100%;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  font-size: 0;
  background-color: var(--color-secsondary);
}

header .btns {
  display: flex;
  gap: 5px;
}

header button.icon.dark input[type="checkbox"] {
  display: none;
}

header button.icon.dark svg {
  transition:
    fill 0.2s,
    rotate 0.2s;
}

header button.icon.dark input[type="checkbox"]:checked ~ svg {
  rotate: 360deg;
}

h1 {
  padding: 2px 10px;
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 0.5px;
  color: white;
  background-color: var(--color-primary);
}

form {
  margin: auto;
  width: 100%;
  max-width: 540px;
  padding: 0 20px 60px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

form label {
  font-size: 1.4rem;
  font-weight: 500;
}

form label.row-label {
  margin-block: 30px 10px;
  display: flex;
  gap: 8px;
  align-items: center;
  white-space: nowrap;
}

form label.row-label svg {
  width: 19px;
  height: 15px;
  fill: none;
  stroke: var(--color-text);
  stroke-width: 1px;
}

form .row {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  column-gap: 10px;
  row-gap: 30px;
}

form .row.price-row {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
}

input {
  min-width: 70px;
  width: 70px;
  padding: 8px;
  height: 38px;
  font-size: 1.6rem;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  background-color: var(--color-input-bg);
  outline-color: var(--color-primary);
  accent-color: var(--color-primary);
}

input#price {
  width: unset;
}

.vouchers {
  display: flex;
  gap: 10px;
}

.optional-input {
  display: flex;
}

.optional-input input {
  border-radius: 4px 0 0 4px;
}

.optional-input button.remove-voucher {
  padding: 2px;
  border: 1px dashed var(--color-border);
  border-left: none;
  border-radius: 0 4px 4px 0;
  overflow: hidden;
}

button {
  flex-shrink: 0;
  padding: 8px;
  font-size: 1.6rem;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  background-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

button:hover,
button:focus-visible {
  background-color: var(--color-secondary-hover);
}

button.icon {
  font-size: 0;
}

button.icon svg {
  width: 20px;
  height: 20px;
}

button.icon.fill svg {
  fill: var(--color-text);
  stroke: none;
}

button.icon.stroke svg {
  fill: none;
  stroke: var(--color-text);
  stroke-width: 1.5px;
  stroke-linecap: round;
}

button.add-voucher {
  border: 1px dashed var(--color-border);
}

button[type="submit"] {
  margin-left: auto;
  width: 105px;
  color: white;
  background-color: var(--color-primary);
  border: 1px solid var(--color-primary-hover);
}

button[type="submit"]:hover,
button[type="submit"]:focus-visible {
  background-color: var(--color-primary-hover);
}

hr {
  width: 100%;
  margin: 30px auto;
  border-bottom: 1px solid var(--color-border);
}

.results {
  width: 100%;
  display: flex;
  flex-direction: column;
}

.results #loading {
  height: 26px;
  display: grid;
  place-items: center;
  background-color: var(--color-secondary);
}

.results #loading #loading-ring {
  width: 20px;
  height: 20px;
  border: 1px solid var(--color-secondary-hover);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  opacity: 0;
  animation:
    fade-in 0.1s 0.1s forwards,
    rotate 1s linear infinite;
}

@keyframes fade-in {
  to {
    opacity: 1;
  }
}

@keyframes rotate {
  to {
    rotate: 360deg;
  }
}

.results .row {
  align-items: flex-start;
  flex-wrap: nowrap;
  gap: 30px;
  opacity: 0;
  translate: 0 -10px;
  animation: fade-down 0.2s 0.05s forwards;
}

.results .row:first-child {
  animation-delay: 0s;
}

@keyframes fade-down {
  to {
    opacity: 1;
    translate: 0 0;
  }
}

.results .row:not(:last-child) {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border-light);
}

.results .row .sum {
  width: 90px;
  height: 41px;
  flex-shrink: 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.results .row .tip {
  font-size: 1.2rem;
  color: #929292;
}

.results .row .vouchers-wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  min-height: 41px;
}

.results .row .voucher {
  display: flex;
  align-items: center;
  gap: 5px;
  font-weight: 500;
}

.results .row .voucher .value {
  padding: 3px 10px 2px;
  background-color: var(--color-primary-alpha);
  border: 1px dashed var(--color-primary-hover);
  border-radius: 4px;
}

/* Modal */

dialog {
  margin: auto;
  margin-top: 80px;
  width: 90%;
  max-width: 540px;
  border-radius: 4px;
  background-color: var(--color-input-bg);
  box-shadow: 0 4px 10px var(--color-shadow);
  overflow: hidden;
  opacity: 0;
  translate: 0 10px;
  animation: fade-up 0.2s forwards;
}

@keyframes fade-up {
  to {
    opacity: 1;
    translate: 0 0;
  }
}

dialog::backdrop {
  background-color: var(--color-secondary);
  opacity: 0.8; /* FF doesn't support animations & transitions to ::backdrop */
  animation: backdrop-fade-in 0.2s forwards;
}

@keyframes backdrop-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 0.8;
  }
}

dialog #modal-box {
  width: 100%;
  max-height: calc(100vh - 100px);
  padding: 20px;
  padding-bottom: 30px;
  overflow-y: auto;
  scrollbar-width: thin;
}

dialog #modal-box .header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

dialog #modal-box p {
  margin-bottom: 20px;
}

dialog #modal-box ul {
  margin-bottom: 40px;
  padding-left: 25px;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

dialog #modal-box ul li b {
  position: relative;
}

dialog #modal-box ul li b::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  bottom: 0;
  height: 6px;
  width: 100%;
  background-color: var(--color-primary-alpha);
}

dialog #modal-box .credit,
dialog #modal-box .credit a {
  width: max-content;
  margin: auto;
  text-decoration: none;
  letter-spacing: 0.5px;
}

dialog #modal-box .credit a:hover,
dialog #modal-box .credit a:focus-visible {
  text-decoration: underline;
}

@media screen and (max-width: 560px) {
  .vouchers {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
  }
  input {
    width: 100%;
  }
  button[type="submit"] {
    width: 100%;
  }
}