:root {
  --spacing: 1.5rem;
  --link-dark-color: rgb(0, 83, 134);
  --link-light-color: rgb(156, 217, 255);
  --clr-white: rgb(245, 245, 255);
  --clr-black: rgb(0, 0, 30);
  --clr-light-gray: rgb(230, 230, 245);
  --clr-dark-shadow-5: rgba(0, 0, 10, 5%);
  --clr-dark-shadow-10: rgba(0, 0, 10, 10%);
  --clr-dark-shadow-20: rgba(0, 0, 10, 20%);
  --clr-light-shadow-5: rgba(200, 200, 255, 5%);
  --clr-light-shadow-10: rgba(200, 200, 255, 10%);
  --clr-light-shadow-20: rgba(200, 200, 255, 20%);
  --main-page-width: 120rem;
  --table-min-width: 60rem;
  --biggest-font-size: 5rem;
  --bigger-font-size: 4rem;
  --big-font-size: 3.2rem;
  --medium-font-size: 2.4rem;
  --small-font-size: 1.6rem;
  --smaller-font-size: 1.4rem;
  --smallest-font-size: 1.2rem;
  --transition-fast: 300ms;
  --transition-medium: 600ms;
  --transition-slow: 1s;
  --default-border-radius: 4px;
}

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

html {
  font-size: 62.5%;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.5;
  font-size: var(--small-font-size);
  color: var(--clr-black);
  -webkit-font-smoothing: antialiased;
  background: var(--clr-light-gray);
}

img,
svg {
  display: block;
  max-width: 100%;
}

.header {
  background: var(--clr-black);
  padding: var(--spacing);
  box-shadow: 0 5px 10px 2px var(--clr-dark-shadow-20);
  z-index: 1;
  position: relative;
}

.header-heading {
  font-size: var(--biggest-font-size);
  text-align: center;
}

.header-link {
  color: var(--link-light-color);
  text-decoration: none;
  transition: filter var(--transition-fast) ease-in-out;
}

.header-link:hover {
  filter: brightness(70%);
}

.menu {
  margin: var(--spacing);
}

.menu-list {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-flow: row wrap;
}

.menu-link {
  display: block;
  padding: var(--spacing);
  color: var(--link-light-color);
  text-decoration: none;
  transition: background-color var(--transition-fast) ease-in-out;
  border-radius: var(--default-border-radius);
}

.menu-link:hover {
  background: var(--clr-light-shadow-10);
}

.content {
  max-width: var(--main-page-width);
  margin: calc(var(--spacing) * 2) auto;
  padding: var(--spacing);
  background: var(--clr-white);
  box-shadow: 2px 2px 5px var(--clr-dark-shadow-20);
  border-radius: var(--default-border-radius);
}

.responsive-table {
  width: 100%;
  overflow-x: auto;
}

.contacts-table {
  width: 100%;
  min-width: var(--table-min-width);
  border-collapse: collapse;
}

.table-caption {
  font-size: var(--medium-font-size);
  font-weight: bold;
  padding: var(--spacing);
}

.table-row {
  text-align: left;
  text-overflow: ellipsis;
  transition: background-color var(--transition-fast) ease-in-out;
}

.table-row:nth-of-type(2n) {
  background: var(--clr-dark-shadow-5);
}

.table-row:not(.table-row-header):hover {
  background: var(--clr-dark-shadow-10);
}

.table-row-header {
  background: var(--clr-light-gray);
  color: var(--clr-black);
}

.table-cel,
.table-header {
  padding: var(--spacing);
}

.table-link {
  color: var(--link-dark-color);
  transition: color var(--transition-fast) ease-in-out;
  text-decoration: none;
}

.table-link:hover {
  color: var(--clr-black);
}

@media (min-width: 600px) {
  .single-contact {
    max-width: 80%;
    margin: calc(var(--spacing) * 2) auto;
  }
}

.single-contact h1 {
  margin: 1rem 0;
}

.single-contact p {
  margin: 1rem 0;
}

.pagination {
  margin-top: var(--spacing);
  display: flex;
  justify-content: center;
  padding: calc(var(--spacing) * 0.8);
  font-size: var(--small-font-size);
}

.pagination .step-links {
  display: flex;
  gap: calc(var(--spacing) * 0.8);
}

.pagination .step-links a {
  color: var(--link-dark-color);
  transition: color var(--transition-fast) ease-in-out;
  text-decoration: none;
  display: block;
}

.search {
  display: flex;
  justify-content: center;
}

.search-input {
  font-size: var(--medium-font-size);
  padding: 1rem 2rem;
  width: 100%;
  max-width: 32rem;
  border-radius: var(--default-border-radius);
  border: 1px solid var(--link-light-color);
}

.search-input:focus {
  box-shadow: 0 0 15px var(--link-light-color);
}

.message {
  max-width: 600px;
  margin: var(--spacing) auto;
  margin-top: calc(var(--spacing) * 2);
  padding: var(--spacing);
  text-align: center;
  border-radius: var(--default-border-radius);
  font-size: var(--smaller-font-size);
}

.message.success {
  background: rgba(0, 255, 0, 0.3);
  border: 1px solid rgba(0, 255, 0, 90%);
}

.message.error {
  background: rgba(255, 0, 0, 0.3);
  border: 1px solid rgba(255, 0, 0, 90%);
}

.message.warning {
  background: rgba(255, 255, 0, 0.3);
  border: 1px solid rgba(255, 255, 0, 90%);
}
.message.info {
  background: rgba(0, 0, 255, 0.3);
  border: 1px solid rgba(255, 255, 0, 90%);
}

.form-wrapper {
  max-width: 60rem;
  margin: var(--spacing) auto;
}

.form-content {
  margin: var(--spacing) 0;
}

.form-group {
  display: flex;
  flex-direction: column;
  padding-bottom: var(--spacing);
}
.errorlist {
  list-style: none;
  font-size: var(--smaller-font-size);
  color: tomato;
}
.errorlist.nonfield {
  color: inherit;
}

.form-group p {
  margin: 1em 0;
}

.form-group .help-text,
.form-group .help-text ~ ul {
  margin: 0;
  font-size: var(--smallest-font-size);
  list-style: none;
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 1rem;
  border-radius: var(--default-border-radius);
  border: 1px solid var(--link-dark-color);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  box-shadow: 0 0 5px var(--link-dark-color);
}

.form-group label {
  font-size: var(--smaller-font-size);
}

.btn {
  background-color: var(--link-dark-color);
  color: var(--clr-white);
  font-weight: bold;
  border: none;
  padding: 1rem 2rem;
  border-radius: var(--default-border-radius);
  cursor: pointer;
  transition: filter var(--transition-fast) ease-in-out;
}

.btn:hover {
  filter: brightness(90%);
}

.btn:focus,
.btn:active {
  filter: brightness(80%);
  box-shadow: 0 0 5px var(--link-dark-color);
}

.contact-links {
  margin-block: calc(var(--small-font-size) * 2);
  display: flex;
  align-items: center;
  gap: 0 var(--spacing);
}

.btn-link {
  font-size: var(--small-font-size);
  text-decoration: none;
  font-weight: bold;
  padding: 1rem;
  display: block;
  line-height: var(--small-font-size);
}

.btn-delete {
  background: tomato;
}