/* Source: https://github.com/drmercer/techstyle/blob/041354e4920e0f4dd120cddba82d6d706fff351b/src/techstyle.css */
/*!
@see https://techstyle.danmercer.net/

@license

MIT License

Copyright (c) 2025 Dan Mercer

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

@layer techstyle {
  @view-transition {
    navigation: auto;
  }

  /* See https://www.gfor.rest/blog/making-pwas-feel-native#overscroll-behavior */
  @media (display-mode: standalone) {
    html,
    body {
      overscroll-behavior: none;
    }
  }

  /* === theme === */

  * {
    accent-color: var(--t-color-fg);
    /* default tap highlight color is based on the hue */
    -webkit-tap-highlight-color: light-dark(
      oklch(0.56 0.19 var(--t-hue-light) / 0.3),
      oklch(0.56 0.19 var(--t-hue-dark) / 0.3)
    );
    /* this makes so many little things easier */
    box-sizing: border-box;
  }

  /* you should set --t-hue, --t-swapped, and color-scheme (as desired) on these elements  */
  :root, .t-theme-root {
    /* these allow you to have a different hue in dark mode, if desired */
    --t-hue-light: var(--t-hue);
    --t-hue-dark: var(--t-hue);
    /* set this to 1 to swap the color to the bg instead of the fg */
    --t-swapped: 0;

    --t-color-fg: color-mix(
      in oklch,
      light-dark(
        oklch(0.56 0.19 var(--t-hue-light)),
        oklch(0.8 0.19 var(--t-hue-dark))
      ),
      light-dark(black, white) calc(var(--t-swapped) * 100%)
    );
    --t-color-bg: color-mix(
      in oklch,
      light-dark(white, #222),
      light-dark(
          oklch(0.8 0.19 var(--t-hue-light)),
          oklch(0.45 0.19 var(--t-hue-dark))
        )
        calc(var(--t-swapped) * 100%)
    );

    color: var(--t-color-fg);
    background-color: var(--t-color-bg);
  }

  :root {
    --t-hue: 266;
    --t-spacing-within: 5px;
    --t-spacing-around: calc(4 * var(--t-spacing-within));
    font-family: system-ui, sans-serif;

    /* avoids runaway text lines */
    word-wrap: break-word;
    hyphens: auto;
    box-decoration-break: clone;

    --t-scrollbar-width: calc(2 * var(--t-spacing-within));
    /* prevents headers/footers from causing horizontal scroll */
    overflow-x: clip;
    scroll-behavior: smooth;

    /* 100vw includes the scrollbar width, so we have to subtract it to compute the real viewport width. Plus we have overflow-x:clip just in case. */
    --t-viewport-width: calc(100vw - var(--t-scrollbar-width));

    color-scheme: light dark;
  }

  /* scrollbar styles */
  body::-webkit-scrollbar {
    width: var(--t-scrollbar-width);
  }
  body::-webkit-scrollbar-thumb {
    background: var(--t-color-fg);
    border-radius: 4px;
    border: 2px solid var(--t-color-bg);
  }
  body::-webkit-scrollbar-track {
    background: var(--t-color-bg);
  }
  @supports not selector(::-webkit-scrollbar) {
    :root {
      /* for header width calculations */
      --t-scrollbar-width: 0;
      scrollbar-color: var(--t-color-fg) var(--t-color-bg);
    }
  }

  /* add your hue to any element! iframes, emojis, you name it!*/
  /* WARNING: always uses `--t-hue`, so if your `--t-hue-dark` and `--t-hue-light` are different, don't use this */
  .t-tinted {
    /* approximate conversion from oklch hue to hsl hue */
    --t-hue-hsl: calc(var(--t-hue) + 20);
    /*
    when not swapped: sepia(1) hue-rotate(...) grayscale(0)
    when swapped: sepia(0) hue-rotate(0deg) grayscale(1)
    the pow() is a hack to make --t-swapped:0.5 work as expected
    */
    --hue-rotate: ;
    filter:
      sepia(calc(1 - var(--t-swapped)))
      hue-rotate(calc((var(--t-hue-hsl) * 1deg - 97deg) *  (1 - pow(var(--t-swapped), 1000))))
      grayscale(var(--t-swapped));
  }

  /* === base classless styles === */

  :target {
    scroll-margin: var(--t-spacing-around);
  }

  body {
    margin: 0;
    padding-inline: var(--t-spacing-around);
    line-height: 1.4;
    text-align: center;

    /* Apply guttering to the body (some elements escape this - see "full-width" snippets) */
    width: 100%;
    max-width: clamp(350px, 60vw, 700px);
    margin-inline: auto;

    /* when it's supported, add margin-trim: block */
    > :first-child {
      margin-top: 0;
    }
    > :last-child {
      margin-bottom: 0;
    }
  }

  p, pre, ul, ol {
    text-align: initial;
  }

  header,
  footer {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;

    /* Make footers/headers full-page, unless they have a container */
    &:not(.t-sidebyside *, .t-card *, dialog *) {
      /* Full-width (.t-sidebyside also does this) */
      width: max(var(--t-viewport-width), 100%);
      position: relative;
      left: calc((var(--t-viewport-width) - 100%) * -0.5);
      /* used to use transform/translate here, but it breaks popover positioning */

      padding: var(--t-spacing-around) calc(2 * var(--t-spacing-around));
    }

    /* center an only child */
    &:has(> :only-child) {
      justify-content: center;
    }
  }

  form,
  p,
  hr {
    margin-block: var(--t-spacing-around);
  }

  hr {
    border: none;
    border-bottom: 2px solid currentColor;
  }

  pre {
    white-space: pre-wrap;
  }

  /* sections have margin when they have siblings */
  * + section {
    margin-top: calc(2 * var(--t-spacing-around));
  }
  section:has(+ *) {
    margin-bottom: calc(2 * var(--t-spacing-around));
  }

  /* === form elements === */

  *:focus-visible {
    outline: 2px dashed var(--t-color-fg);
    outline-offset: 2px;
    border-radius: var(--t-spacing-within);
  }

  /* Button inputs */
  button,
  select,
  input[type="submit"],
  input::file-selector-button {
    appearance: none;
    background: none;
    font: inherit;
    font-size: inherit;
    color: var(--t-color-fg);
    --border-width: 2px;
    border: var(--border-width) solid currentColor;
    border-radius: var(--t-spacing-within);
    padding: var(--t-spacing-within) calc(2 * var(--t-spacing-within));
    cursor: pointer;
    position: relative;
    /* disallows double-taps, making single taps dispatch immediately */
    touch-action: manipulation;

    fieldset & + & {
      border-inline-start-width: 0;
    }

    @media (prefers-reduced-motion) {
      &:active, &:hover {
        text-decoration: underline 2px;
      }
      @media (hover: hover) {
        &:hover {
          text-decoration: underline 2px;
        }
      }
    }
  }
  /* animate buttons/selects when clicked */
  @media not (prefers-reduced-motion) {
    button {
      /* The real border is on a pseudoelement, which animates when clicked. That avoids changing the actual hit box of the button. */
      /* Sadly, can't do this on input[type=submit] because inputs aren't containers so pseudoelements don't work */
      /* <select> elements can't do this either, for similar reasons - children are handled specially by the browser */
      border: var(--border-width) solid transparent;
      /* no tap highlight because :active takes care of that */
      -webkit-tap-highlight-color: transparent;

      &::before {
        content: "\200b";
        position: absolute;
        /* inset is relative to the content box, not the border box, so we have to correct it */
        inset: calc(var(--border-width) * -1);
        border: inherit;
        border-radius: inherit;
        border-color: currentColor;
        transition: scale 25ms ease-in;
      }
      @media (hover: hover) {
        &:hover::before {
          scale: 1.05;
        }
      }
      &:active::before {
        scale: 0.95;
      }
    }
  }

  /* Text inputs */
  /* (I wish there was a cleaner way to do this...) */
  input:not([type]),
  input[type="text"],
  input[type="password"],
  input[type="email"],
  input[type="number"],
  input[type="search"],
  input[type="tel"],
  input[type="url"],
  textarea {
    appearance: none;
    color: var(--t-color-fg);
    background: inherit;
    font: inherit;
    font-family: monospace;
    border: 1px solid currentColor;
    padding: var(--t-spacing-within);
    border-radius: var(--t-spacing-within);
    border-left-width: 0;
    border-right-width: 0;
    width: 100%;

    &::placeholder {
      color: var(--t-color-fg);
      opacity: 0.8;
      font-style: italic;
    }

    fieldset & {
      flex: 1;
    }
  }

  textarea {
    field-sizing: content;
    resize: none;
  }

  fieldset {
    border: none;
    padding: 0;
    margin: 0;
    display: flex;
    /* TODO if I want to do this, I'll need to figure something out with borders... */
    /* justify-content: space-between;
    align-items: stretch; */

    > :not(:last-child) {
      border-start-end-radius: 0;
      border-end-end-radius: 0;
    }
    > :not(:first-child) {
      border-start-start-radius: 0;
      border-end-start-radius: 0;
    }
  }

  /* === interactive elements === */

  ::selection {
    /* Brave for Android had (has?) a bug where CSS vars don't work in ::selection, hence the defaults here */
    color: var(--t-color-bg, white);
    background-color: var(--t-color-fg, #888);
  }

  a {
    color: var(--t-color-fg);
    text-decoration-line: underline;
    text-decoration-thickness: 2px;


    @media (hover: hover) {
      &:hover:not(:active) {
        text-decoration-thickness: 3px;
      }
    }
    /* no tap highlight because :active takes care of that */
    -webkit-tap-highlight-color: transparent;
    &:active {
      text-decoration-thickness: 4px;
    }
  }

  iframe {
    border: none;
    width: 100%;
    min-height: min(65svh, 400px);
  }

  dialog,
  [popover] {
    width: 300px;
    max-width: 80%;

    /* Thanks https://blog.logrocket.com/animating-dialog-popover-elements-css-starting-style/ */
    transition: opacity 150ms, scale 150ms, translate 150ms,
              overlay 150ms allow-discrete,
              display 150ms allow-discrete;

    /* destination styles when closing */
    opacity: 0;
    scale: 0.95;
    translate: 0 -10px;
  }
  dialog::backdrop {
    background-color: var(--t-color-bg);
    /* destination styles when closing */
    opacity: 0;
    transition: opacity 150ms,
              overlay 150ms allow-discrete,
              display 150ms allow-discrete;
  }
  /* the "real" styles */
  dialog[open],
  [popover]:popover-open {
    opacity: 1;
    scale: 1;
    translate: 0;
  }
  dialog[open]::backdrop {
    opacity: 0.9;
  }
  /* the "animate from" styles when opening*/
  @starting-style {
    dialog[open],
    [popover]:popover-open {
      opacity: 0;
      scale: 0.95;
      translate: 0 -10px;
    }
    dialog[open]::backdrop {
      opacity: 0;
    }
  }
  @supports (position-area: bottom) {
    [popover] {
      position: fixed;
      inset: unset;
      width: unset;
      margin: 0;
      margin-block: calc(var(--t-spacing-within) / 2);
      position-area: bottom span-all;
      position-try-fallbacks: bottom span-right, bottom span-left,
        top span-right, top span-left;
    }
  }

  summary {
    cursor: pointer;
  }

  /* === custom elements === */

  .t-card {
    display: block;
    margin-block: 20px;
    position: relative;
  }
  .t-card,
  dialog,
  [popover] {
    color: var(--t-color-fg);
    background-color: var(--t-color-bg);
    border: 2px solid currentColor;
    border-radius: var(--t-spacing-within);
    padding: var(--t-spacing-within);

    /* when it's supported, add margin-trim: block */
    > :first-child {
      margin-top: 0;
    }
    > :last-child {
      margin-bottom: 0;
    }

    &[aria-label] {
      /* extra padding to accommodate the title psuedo-element */
      padding-top: calc(var(--t-spacing-within) + 0.5lh);
    }
    &[aria-label]::before {
      position: absolute;
      top: calc(-0.5lh - var(--t-spacing-within));
      content: attr(aria-label);
      background: var(--t-color-bg);
      padding-inline: 2px;
      border-radius: 2px;
      left: var(--t-spacing-within);
    }
  }

  /* lists that contain cards should not have decoration */
  :is(ul, ol):has(.t-card) {
    padding: 0;

    li {
      list-style: none;
    }
  }

  menu {
    list-style: none;
    margin: 0;
    padding: 0;

    & > li:not(:last-child) {
      margin-bottom: var(--t-spacing-within);
    }

    button {
      width: 100%;
    }
  }

  /* === layouts === */

  .t-sidebyside {
    margin: var(--t-spacing-around) 0;

    /* Full-width (headers and footers also do this) */
    width: max(var(--t-viewport-width), 100%);
    position: relative;
    left: calc((var(--t-viewport-width) - 100%) * -0.5);
    /* used to use transform/translate here, but it breaks popover positioning */

    padding-inline: var(--t-spacing-around);

    /* Arrange contents side-by-side */
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--t-spacing-around);
    flex-wrap: wrap;

    & > * {
      max-width: clamp(350px, 60vw, 500px);
      margin: 0; /* no margin because gap takes care of it */
      flex: 1 1 350px;
    }
  }

  .t-fullheight {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;

    /* If no header, put a pseudoelement in that spot in the flex arrangement */
    &:not(:has(> header:first-child))::before {
      content: "\200b";
      width: 0;
      height: 0;
    }

    /* If no footer, put a pseudoelement in that spot in the flex arrangement */
    &:not(:has(> footer:last-child))::after {
      content: "\200b";
      width: 0;
      height: 0;
    }
  }
}