/* #region basic */
html {
  scroll-behavior: smooth;
}

:root {
  --bg: #d8d8d8ff;
  --card: #ecececff;
  --card-alt: #77777713;
  --card-accent: #e8ecf0;
  --text: #303030;
  --text-alt: #ffffff;
  --accent: #5c5c5c;
  --stroke: #0e1426;
  --code-bg: #ececec9a;
  --nonopacity: #d8dbddff;
  --bshadow-alt: 0 0 20px 2px rgba(124, 124, 124, 0.53);
  --bshadow: 0 0 20px 2px rgba(42, 43, 42, 0.527);
  --transition-speed: 0.35s;
}

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

body {
  font-family: Inter, system-ui, sans-serif;
  margin: 0;
  padding: 0;
  font-size: 16px;
  line-height: 1.4;
  background: var(--bg);
  border: none;
  color: var(--text);
}
/* #endregion basic */

/* #region global elements */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  display: flex;
  justify-content: center;
  align-items: center;
  padding-top: 20px;
  color: var(--text);
}

h1 {
  font-size: 1.6rem;
  text-align: center;
  padding: 40px 8px 15px 8px;
}

h2 {
  font-size: 1.4rem;
  text-align: center;
  padding: 10px 0 0 0;
}

h3 {
  font-size: 1.1rem;
  text-align: center;
  padding: 0 0 5px 0;
}

h4,
h5 {
  font-size: 1em;
  text-align: center;
  margin: 10px;
}

p strong {
  display: flex;
  justify-content: center;
  padding: 5px;
  overflow-wrap: break-word;
  text-align: center;
}

p {
  padding: 5px;
  overflow-wrap: break-word;
}
.footer p {
  padding: 5px;
  overflow-wrap: break-word;
  text-align: center;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

section ul {
  background-color: rgba(126, 126, 126, 0.08);
  padding: 2px 10px;
}

section li {
  padding-bottom: 5px;
}
.section-about {
  background-color: var(--bshadow-alt);
  border: 1px solid var(--stroke);
  border-radius: 6px;
  margin: 10px 0;
  padding: 10px;
    box-shadow: 0 0 6px var(--accent);

}

section li::before {
  content: '✔ ';
  color: var(--text);
  font-weight: bold;
  font-size: 14px;
}

.highlight {
  font-weight: bolder;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

#author-name {
  font-style: italic;
  color: var(--text);
}
/* #endregion global elements */

/* #region layout */
.container {
  width: 100%;
  padding-left: 10px;
  padding-right: 10px;
}

.wrap-content {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0;
}

.section {
  margin-top: 5px;
  padding: 0;
}
/* #endregion layout */

/* #region header */

header {
  margin-bottom: 0;
  border-radius: 0;
  border: none;
  box-shadow: none;
  width: 100%;
  background: var(--card-alt);
}

.header-menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(6px, calc(320px / 10), 12px);
}

.header-link {
  display: inline-flex;
  justify-content: space-around;
  align-items: center;
  text-align: center;
  min-width: 100px;
  white-space: nowrap;
  padding: 0 2px;
  text-decoration: none;
  font-weight: 400;
  height: 30px;
  border: 1px solid #383838;
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  transition:
    background 0.5s,
    color 0.5s,
    transform 0.3s;
}

.header-link:hover {
  background: var(--code-bg);
  color: var(--text);
  transform: translateY(-2px);
  outline: 1px solid #000000ff;
}
/* #endregion header */

/* #region nav */
.nav-menu {
  position: sticky;
  top: 31px;
  padding: 5px;
  margin: 0;
  border: 1px solid var(--stroke);
  box-shadow: inset 0 0 5px var(--accent);
  background-color: var(--bg);
  border-radius: 0;
  box-shadow: 0 0 8px var(--accent);
  z-index: 5;
}
/* #endregion nav */

/* #region theme switcher */
.theme-circle {
  position: fixed;
  box-shadow:
    inset 0 4px 10px rgba(0, 0, 0, 0.53),
    inset 0 -4px 10px rgba(34, 34, 34, 0.53);
  width: 100vw;
  top: 0;
  right: 50%;
  margin: 0;
  display: flex;
  justify-content: center;
  gap: clamp(8px, calc((100vw - 320px) / 10), 20px);
  padding: 6px;
  transform: translateX(50%);
  background-color: #e7e7e7ff;
  border: 1px solid var(--stroke);
  z-index: 3;
}

.circle {
  width: 18px;
  height: 18px;
  outline: 0.5px solid rgba(0, 0, 0, 1);
  border-radius: 50%;
  cursor: pointer;
  box-shadow:
    inset 5px 5px 0px rgba(0, 255, 255, 0),
    inset 0 0 1px rgba(255, 255, 255, 1),
    inset 2px 2px 2px rgba(255, 255, 255, 0.39),
    inset -2px -2px 4px rgba(0, 0, 0, 0.7),
    5px 5px 20px var(--accent);
}

.circle:hover,
.circle:focus {
  outline: 0.5px solid rgba(160, 160, 160, 1);
}
/* #endregion theme switcher */

/* #region scroll */
.icon {
  display: flex;
  align-items: center;
  justify-content: space-around;
  width: 20px;
  height: 20px;
  margin-right: 6px;
  fill: currentColor;
  flex-shrink: 0;
  filter: drop-shadow(1px 1px 3px black);
}

.icon-scroll-back {
  position: fixed;
  transform: rotate(90deg);
  top: 2px;
  left: 6px;
  z-index: 4;
}

.icon-scroll-up {
  position: fixed;
  top: 2px;
  right: 6px;
  transform: rotate(180deg);
  z-index: 4;
}

.icon-scroll-down {
  position: fixed;
  bottom: 6px;
  right: 6px;
  z-index: 4;
}

.icon-scroll-svg {
  position: fixed;
  top: 50%;
  right: 50%;
  color: #000000ff;
  content: '';
  transform: translate(50%, -50%) scale(0.7);
}

.icon-scroll-svg:hover {
  color: var(--text-logo);
  color: var(--text);
}

.swim-scroll {
  display: inline-flex;
  position: relative;
  justify-content: end;
  width: 21px;
  height: 21px;
  border: 1px solid rgba(0, 0, 0, 1);
  border-radius: 50%;
  background-color: #ffffff;
  animation: bounce 1.5s infinite;
}

.swim-scroll:hover {
  background-color: #ffffff;
  border: 2px solid var(--text);
}
@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(6px);
  }
}
/* #endregion scroll */

/* #region input + buttons */
.input-buttons {
  position: sticky;
  top: 32px;
  left: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: 100%;
  padding: 6px;
  margin-top: 6px;
  margin-bottom: 6px;
  border: 2px solid var(--text);
  border-radius: 6px;
  background: linear-gradient(0deg, var(--nonopacity), var(--nonopacity));
  box-shadow: 0 0 15px var(--text);
  z-index: 3;
}

.input-buttons input[type='search'] {
  flex: 1 1 auto;
  padding: 4px;
  font-size: 18px;
  border-radius: 6px;
  border: 1px solid var(--stroke);
  background-color: var(--card);
  color: var(--text);
  outline: none;
  transition:
    border-color 0.3s ease,
    box-shadow 0.3s ease;
}
.input-buttons input[type='search']:hover,
.input-buttons input[type='search']:focus {
  border-color: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  outline: 1px solid var(--accent);
}

.btn {
  flex: 1 1 auto;
  padding: 6px 10px;
  font-size: 16px;

  border: 1px solid var(--stroke);
  border-radius: 6px;
  background: var(--code-bg);
  color: var(--text);
  cursor: pointer;
  user-select: none;
  transition:
    transform 0.3s ease,
    background 0.3s ease,
    border-color 0.3s ease;
}

.btn:hover,
.btn:focus {
  background: var(--card-alt);
  border-color: #0e1426;
  outline: 1px solid var(--accent);
}

.btn:active {
  transform: translateY(-2px);
}
/* #endregion input + buttons */

/* #region faq */
details.faq {
  width: 100%;
  max-width: 1200px;
  margin: 6px auto;
  padding: 3px;
  border: 1px solid var(--stroke);
  border-radius: 6px;
  background: linear-gradient(180deg, var(--card), var(--card-alt));
  overflow: hidden;
  cursor: pointer;
}

summary {
  display: inline-block;
  gap: 5px;
  padding-right: 0;
  font-weight: 600;
  letter-spacing: 0.2px;
  user-select: none;
}

.chev {
  display: inline-block;
  transition: transform 0.3s ease;
  scale: 1;
  margin: 0 5px;
}

details[open] .chev {
  transform: rotate(90deg) scale(1.2);
  color: var(--accent);
}

.answer {
  margin-top: 6px;
  width: 100%;
  box-sizing: border-box;
  overflow-wrap: break-word;
}

summary code,
li code,
p code {
  display: inline-block;
  vertical-align: middle;
  line-height: 1.2;
  padding: 0;
  border: 1px solid var(--text);
}

pre,
code {
  display: inline-block;
  background: var(--code-bg);
  color: var(--text);
  border-radius: 4px;
  padding: 0;
  font-family: Consolas, monospace;
  font-size: 0.95em;
  white-space: pre-wrap;
  word-break: break-word;
  max-width: 100%;
  overflow-x: auto;
}

pre {
  display: block;
  background: var(--code-bg);
  overflow-x: auto;
  font-size: clamp(14px, 2vw, 16px);
}
/* #endregion faq */

/* #region footer */
.footer {
  position: relative;
  background: var(--card-alt);
  border-top: 1px solid var(--stroke);
  width: 100%;
  padding: 10px;
  box-shadow: inset 0 0 10px var(--text);
}
.footerok {
  background: var(--card-alt);
  border-top: 1px solid var(--stroke);
  width: 100%;

  box-shadow: inset 0 0 10px var(--text);
}

.footerok p {
  text-align: center;
  color: var(--accent);
  padding: 30px;
  letter-spacing: 2px;
}

.footer a {
  color: var(--text);
  font-weight: 400;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
  color: var(--text);
}

.footer-top {
  display: flex;
  justify-content: center;

  align-items: flex-start;
  max-width: 900px;
  font-size: 1rem;

  margin: 0 auto;
  width: 100%;
}

.footer-left p,
.footer-right p {
  margin: 0;
  /* line-height: 1.5; */
  line-height: 1.4;
}

.footer-right {
  text-align: right;
  display: none;
}

.footer .copy {
  text-align: center;
  font-size: 0.9rem;
  color: var(--accent);
}
/* #endregion footer */

/* #region  logo */
.logo {
  position: absolute;
  bottom: 37px;
  left: -15px;
  transform: rotate(270deg) scale(0.8);
  cursor: pointer;
  border: 2px solid rgba(190, 190, 190, 1);
  box-shadow:
    0 0 5px 2px #000000ff,
    inset 0 0 18px #63636386;
  border-radius: 4px;
  transition: ease 350ms;
  z-index: 6;
}
.logo:hover {
  outline: 1px solid rgba(255, 255, 255, 1);
}
/* #endregion  logo */


/* #region min 768 -------------------------------------- */
@media (min-width: 768px) {
  body {
    font-size: 20px;
    line-height: 1.4;
  }
  .header {
    box-shadow: inset var(--bshadow);
    border-bottom: 1px solid var(--stroke);
  }
  .header-menu {
    justify-content: center;
    gap: clamp(6px, calc((768px - 320px) / 10), 12px);
  }
  .nav-menu {
    top: 37px;
    padding: 15px;
    margin: 10px 39px;
    border: 1px solid var(--stroke);
    box-shadow: inset 0 0 5px var(--accent);
    background-color: var(--bg);
    border-radius: 6px;
  }
  .icon {
    width: 22px;
    height: 22px;
    margin-right: 8px;
  }
  .header-link {
    min-width: 110px;
    font-weight: 500;
    height: 34px;
  }

  .theme-circle {
    padding: 8px 0;
    transform: translateX(50%);
    background-color: #e7e7e7ff;
    border: 1px solid var(--stroke);
    z-index: 3;
  }

  .circle {
    width: 20px;
    height: 20px;
  }
  .input-buttons {
    top: 37px;
    margin-top: 10px;
    margin-bottom: 10px;
    background: linear-gradient(0deg, var(--nonopacity), var(--nonopacity));
  }
  .input-buttons {
    padding: 6px;
    font-size: 20px;
  }
  .btn {
    flex: 0 0 auto;
  }

  .chev {
    scale: 1.1;
  }
  h1 {
    font-size: 1.8rem;
    padding: 60px 10px 30px 10px;
  }

  h2 {
    font-size: 1.6rem;
  }
  h3 {
    font-size: 1.3rem;
  }
  .section {
    margin-top: 5px;
    padding: 0 30px;
  }
  section ul {
    background-color: rgba(126, 126, 126, 0.08);
    padding: 5px 20px;
  }

  .section-about {
    background-color: var(--bg);
    border: 1px solid var(--stroke);
    border-radius: 6px;
    margin: 30px 30px;
    padding: 20px;
  }

  .wrap-content {
    padding: 0 40px;
  }
  details.faq {
    margin: 8px auto;
    padding: 5px;
  }
  /* ------------------- */
  .icon-scroll-back {
    top: 2px;
    left: 10px;
  }

  .icon-scroll-up {
    top: 2px;
    right: 10px;
  }

  .icon-scroll-down {
    bottom: 6px;
    right: 10px;
  }

  .icon-scroll-svg {
    transform: translate(50%, -50%) scale(0.8);
  }

  .swim-scroll {
    width: 27px;
    height: 27px;
  }
  /* ------------------- */
  .footer {
    padding: 15px 25px;
  }
  .footer p {
    text-align: left;
    color: var(--accent);
  }

  .footer-top {
    font-size: 1.1rem;
    justify-content: space-between;
  }

  .footer-right {
    text-align: end;
    display: inline-block;
  }
  .footer .copy {
    margin-top: 0;
    font-size: 1rem;
  }
  .logo {
    bottom: -15px;
    left: 50%;
    transform: translate(-30px, -80px);
  }
}
/* #endregion min 768 */

/* #region min 1024 -------------------------------------- */
@media (min-width: 1024px) {
  body {
    max-width: 1200px;
    margin: 0 auto;
    font-size: 20px;
    line-height: 1.4;
    background: var(--card);
    border: 1px solid var(--stroke);
    box-shadow: inset var(--bshadow);
  }
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: url('../img/bg/zavitushki.jpg') center / 105%;
    opacity: 0.12;
    z-index: -1;
    animation: bgscroll 60s linear infinite alternate;
  }

  @keyframes bgscroll {
    from {
      background-position-y: 0;
    }
    to {
      background-position-y: 100%;
    }
  }

  .container {
    padding: 0 50px;
  }

  .header {
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--stroke);
  }
  .header-menu {
    justify-content: center;
    gap: clamp(6px, calc((1024px - 320px) / 10), 18px);
  }

  .nav-menu {
    top: 43px;
    padding: 20px 0;
    margin: 20px 149px;
  }

  .icon {
    width: 24px;
    height: 24px;
    margin-right: 8px;
  }
  .header-link {
    font-weight: 600;
    height: 40px;
    min-width: 140px;
    font-size: 1.2rem;
  }

  .theme-circle {
    max-width: 1200px;
    gap: clamp(8px, calc((100vw - 320px) / 10), 30px);
    padding: 10px 0;
    box-shadow:
      inset 0 4px 10px rgba(0, 0, 0, 0.53),
      inset 0 -4px 10px rgba(34, 34, 34, 0.53);
    border: 1px solid var(--stroke);
  }
  .circle {
    width: 22px;
    height: 22px;
  }

  .input-buttons {
    top: 44px;
    padding: 10px;
    margin-top: 20px;
    margin-bottom: 20px;
    background: linear-gradient(0deg, var(--nonopacity), var(--nonopacity));
  }
  .input-buttons input[type='search'] {
    padding: 8px;
    font-size: 22px;
  }

  .section {
    margin-top: 10px;
    padding: 0 100px;
  }
  section ul {
    background-image: linear-gradient(var(--code-bg), var(--card-accent));
    padding: 10px 30px;
    outline: 1px solid var(--stroke);
    border-radius: 6px;
  }
  .section-about {
    background-color: var(--bg);
    border: 1px solid var(--stroke);
    border-radius: 6px;
    margin: 30px 100px;
    padding: 30px;
  }

  .wrap-content {
    padding: 0;
    background: var(--card);
  }
  details.faq {
    margin: 10px auto;
    padding: 5px;
  }
  summary {
    padding-right: 260px;
  }
  .chev {
    scale: 1.35;
  }
  h1 {
    font-size: 2rem;
    padding: 80px 10px 40px 10px;
  }

  h2 {
    font-size: 1.8rem;
  }

  h3 {
    font-size: 1.3rem;
  }

  .footer {
    padding: 15px;
    box-shadow: inset var(--bshadow);
    border-top: 1px solid var(--stroke);
    border-bottom: 1px solid var(--stroke);
  }

  .footer-left p,
  .footer-right p {
    line-height: 1.6;
  }
  /* ---------------- */
  .icon-scroll-back {
    top: 3px;
    left: 10px;
  }

  .icon-scroll-up {
    top: 3px;
    right: 10px;
  }

  .icon-scroll-down {
    bottom: 6px;
    right: 10px;
  }

  .icon-scroll-svg {
    transform: translate(50%, -50%) scale(0.9);
  }

  .swim-scroll {
    width: 28px;
    height: 28px;
  }
  .logo {
    bottom: 0;
    left: 50%;
    transform: translate(-30px, -80px);
  }
  /* ---------------- */
  @media print {
    .theme-circle,
    .btn {
      display: none;
    }

    h1 {
      font-size: 1.6rem;
    }
  }
}
/* #endregion min 1024 */