* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Roboto", "Noto Sans", sans-serif;
  transition-timing-function: cubic-bezier(.4,0,.2,1);
}

/* TODO
 - normalize text size
 - put all colors in variables
 - checklists using ::marker?
 - links
 - CSS scroll snap for columns
   - https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_scroll_snap
 - box-decoration-break: clone; -webkit-box-decoration-break: clone;
 - overscroll-behavior: contain;
 - user-select: text;
*/

:root, ::backdrop {
  --bg-color: #FFF;
  --page-bg-color: #EEE;
  --text-color: rgba(0,0,0,.87);
  --error-triple: 176, 0, 32;
  --error-color: rgb(var(--error-triple));
  --icon-opacity-active: .87;
  --icon-opacity-inactive: .6;
  --icon-opacity-disabled: .38;
  --icon-inactive-filter: brightness(0);
  --icon-checkbox-active-filter: brightness(1);
  --icon-add-hover-filter: brightness(1);
  --icon-menu-hover-filter: brightness(1);
  --icon-search-hover-filter: brightness(1);
  --icon-window-hover-filter: brightness(1);
  --menu-button-hover-bg-color: #FBBC04;
  --button-hover-bg-color: #FFF;
  --button-hover-shadow: 0 2px 16px rgba(0,0,0,.1), 0 2px 4px rgba(0,0,0,.2);
  --fab-bg: #FFF;
  --fab-shadow: 0 2px 12px rgba(0,0,0,.15), 0 2px 6px rgba(0,0,0,.2);
  --fab-shadow-hover: 0 4px 16px rgba(0,0,0,.2), 0 3px 6px rgba(0,0,0,.3);
  --toolbar-shadow-mobile: 0 8px 8px 8px rgba(0,0,0,.2);
  --toolbar-hide-distance-mobile: calc(-56px - 8px);
  --toolbar-button-hover-bg-mobile: rgba(0,0,0,.1);
}

/*@media (prefers-color-scheme: dark) { :root, ::backdrop {
  --bg-color: #000;
  --page-bg-color: #000;
  --text-color: rgba(255,255,255,.87);
  --error-triple: 245, 0, 45;
  --error-color: rgb(var(--error-triple));
  --icon-opacity-active: .87;
  --icon-opacity-inactive: .6;
  --icon-opacity-disabled: .38;
  --icon-inactive-filter: brightness(0) invert(1) hue-rotate(180deg);
  --icon-add-hover-filter: brightness(1.4) invert(.1) hue-rotate(0);
  --icon-menu-hover-filter: brightness(1) invert(1) hue-rotate(180deg);
  --icon-search-hover-filter: brightness(1) invert(1) hue-rotate(180deg);
  --icon-window-hover-filter: brightness(.75) invert(1) hue-rotate(180deg);
  --menu-button-hover-bg-color: #FBBC04;
  --button-hover-bg-color: #181818;
  --button-hover-shadow: 0 0 0 transparent;
  --fab-bg: #333;
  --fab-shadow: 0 2px 12px rgba(0,0,0,.2), 0 2px 6px rgba(0,0,0,.24);
  --fab-shadow-hover: 0 2px 12px rgba(0,0,0,.2), 0 2px 6px rgba(0,0,0,.24);
  --toolbar-shadow-mobile: 0 8px 8px 8px #000, 0 56px 56px -56px rgba(255,255,255,.25) inset;
  --toolbar-hide-distance-mobile: calc(-56px - 8px);
  --toolbar-button-hover-bg-mobile: rgba(255,255,255,.1);
}}*/

html {
  background: var(--page-bg-color);
  color: var(--text-color);
  overscroll-behavior: contain;
}

body, dialog { /* TODO */
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

#toolbar { position: fixed; font-size: 0; }
#toolbar > * { font-size: 16px; text-align: center; }
.toolbar-btn { height: 48px; width: 48px; }
.toolbar-btn, .toolbar-fab {
  position: relative;
  border-radius: 100%;
  background: transparent;
  border: none;
  outline: none;
}

.toolbar-btn:not(#conflict-btn)::after, .toolbar-fab::after { content: ""; display: block; height: 24px; width: 24px; background-image: url("icons.svg"); filter: var(--icon-inactive-filter); opacity: var(--icon-opacity-active); position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); }
#menu-btn::after { background-position: 0 0; }
#window-btn::after { background-position: -24px 0; }
#search-btn::after { background-position: -48px 0; }
#add-btn::after { background-position: -72px 0; }

#conflict-btn { display: none; vertical-align: bottom; }
#conflict-btn::after { content: ""; position: absolute; top: 50%; left: 50%; display: block; height: 8px; width: 8px; border-radius: 4px; background: rgba(var(--error-triple), .8); transform: translate(-50%,-50%); }

@media (hover:hover) {
  .toolbar-btn, .toolbar-fab { cursor: pointer; transition: background-color .2s, box-shadow .2s; }
  .toolbar-btn:not(#conflict-btn)::after, .toolbar-fab::after { transition: opacity .1s, filter .1s; filter: var(--icon-inactive-filter); }
  .toolbar-btn:not(#conflict-btn):hover::after, .toolbar-fab:hover::after { opacity: 1; }

  #menu-btn:hover::after { filter: var(--icon-menu-hover-filter); }
  #window-btn:hover::after { filter: var(--icon-window-hover-filter); }
  #search-btn:hover::after { filter: var(--icon-search-hover-filter); }
  #add-btn:hover::after { filter: var(--icon-add-hover-filter); }

  #conflict-btn::after { transition: box-shadow .1s; }
  #conflict-btn:hover::after { box-shadow: 0 0 0 4px rgba(var(--error-triple),.25); }
}

@media (hover:hover) and (min-width:601px) {
  .notes-column { padding: 8px 80px 16px; }
  #toolbar { top: 16px; left: 50%; transform: translate(-50%,0); width: 100%; max-width: calc(7in + 16px); pointer-events: none; }
  #toolbar > * { pointer-events: auto; }
  .toolbar-fab { height: 48px; width: 48px; }
  .toolbar-btn, .toolbar-fab { display: block; margin: 0 16px; }
  .toolbar-btn:not(#conflict-btn):hover, .toolbar-fab:hover { background-color: var(--button-hover-bg-color); box-shadow: var(--button-hover-shadow); }
  .toolbar-btn:not(#conflict-btn)::after, .toolbar-fab::after { opacity: var(--icon-opacity-inactive) }
  .toolbar-btn:not(#conflict-btn):hover::after, .toolbar-fab:hover::after { opacity: var(--icon-opacity-active) }

  #menu-btn:hover { background-color: var(--menu-button-hover-bg-color) !important; }
  #search-btn { position: absolute; top: 0; right: 0; }
  #add-btn { position: absolute; top: 48px; right: 0; }
  #conflict-btn { height: 42px; }
  #conflict-btn.show { display: block; }
}

@media (hover:none), (max-width:600px) {
  .notes-column { padding: 0 16px 16px; }
  #toolbar { bottom: 0; left: 0; right: 0; width: 100%; box-shadow: var(--toolbar-shadow-mobile); padding: 0 4px; background: var(--bg-color); transition: bottom .25s; /* reentrance speed */ }
  .toolbar-btn { display: inline-block; }
  .toolbar-fab { position: absolute; display: block; right: 16px; top: -28px; width: 56px; height: 56px; box-shadow: var(--fab-shadow); background: var(--fab-bg); transition: top .25s; }
  #conflict-btn { width: 36px; }
  #conflict-btn.show { display: inline-block; }

  #toolbar.hide { bottom: var(--toolbar-hide-distance-mobile); transition: bottom .2s; /* exit speed */ }
  #toolbar.hide .toolbar-fab { top: calc(var(--toolbar-hide-distance-mobile) - 16px); transition: top .2s; }

  @media (orientation:portrait) {
    .toolbar-btn { margin: 4px 0; }
  }

  @media (orientation:landscape) {
    .toolbar-btn { margin: 0; }
  }
}

@media (hover:hover) and (max-width:600px) {
  .toolbar-btn:not(#conflict-btn)::before { content: ""; display: block; position: absolute; top: 50%; left: 50%; height: 40px; width: 40px; border-radius: 20px; transform: translate(-50%,-50%); transition: background-color .2s; }
  .toolbar-btn:not(#conflict-btn):hover::before { background-color: var(--toolbar-button-hover-bg-mobile); }
  #menu-btn:hover::before { background-color: var(--menu-button-hover-bg-color) !important; }
  .toolbar-fab { transition: top .25s, box-shadow .2s; }
  #toolbar.hide .toolbar-fab { transition: top .2s, box-shadow .2s; }
  .toolbar-fab:hover { box-shadow: var(--fab-shadow-hover); }
  #add-btn::after { transition: opacity .15s, filter .15s, transform .2s; }
  #add-btn:hover::after { filter: var(--icon-add-hover-filter); transform: translate(-50%,-50%) scale(1.25); }
}

.logo {
  font-weight: 500;
  word-spacing: -.15em;
}
.logo-icon {
  vertical-align: -.45em;
  height: 1.6em;
}

#sign-in-dialog {
  margin: auto;
  width: auto;
  max-width: min(5.5in, 100vw - 32px);
  outline: none;
  border: none;
  border-radius: 24px;
  box-shadow: 0 2px 16px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.1);
  transition: box-shadow .2s;
}
#sign-in-dialog::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: 0 0 0 1px rgba(255,255,255,.2) inset;
  border-radius: 24px;
  pointer-events: none;
  transition: box-shadow .2s;
}
#sign-in-dialog::backdrop {
  background: var(--page-bg-color);
}
#sign-in-form {
  display: block;
  padding: 16px 16px 40px;

  & .logo {
    margin: 16px 0;
    padding: .1em .3em .1em 0;
    font-size: min(48px, 12vw);
    text-align: center;
  }

  & .error-message {
    text-align: center;
    color: var(--error-color);
  }

  & input[type=text],
  & input[type=password],
  & label,
  & button {
    display: block;
    width: 100%;
    max-width: 3.5in;
    margin: 12px auto;
    font-size: inherit;
    letter-spacing: .3px;
    color: var(--text-color);
    border-radius: 16px;
  }

  & input[type=text],
  & input[type=password],
  & button {
    padding: 12px 18px;
    outline: 0;
  }
  & input[type=text],
  & input[type=password] {
    position: relative;
    background-color: #FFF;
    border: 1px solid #FFF;
    border-bottom: 1px solid rgba(0,0,0,.15);
    box-shadow: 0 2px 1px -1px rgba(0,0,0,.1);
    transition: border .2s, box-shadow .2s, opacity .2s;
  }
  & input[type=text]:hover:not(:disabled),
  & input[type=password]:hover:not(:disabled),
  & input[type=text]:focus,
  & input[type=password]:focus {
    border: 1px solid rgba(0,0,0,.07);
    border-bottom: 1px solid rgba(0,0,0,.18);
    box-shadow: 0 2px 16px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.15);
  }
  & input[type=text]::placeholder,
  & input[type=password]::placeholder {
    color: rgba(0,0,0,.6);
  }
  & input[type=text]:autofill,
  & input[type=password]:autofill {
    background-color: rgb(232,240,254);
    border: 1px solid rgb(179,207,255);
  }
  & input[type=text].error,
  & input[type=password].error {
    background-color: rgb(254,232,232);
    border: 1px solid rgb(255,191,191);
  }
  & input[type=text].error:focus,
  & input[type=password].error:focus {
    box-shadow: 0 2px 16px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.15), 0 0 1px 2px rgb(255,191,191) inset;
  }

  & label {
    width: fit-content;
    padding: 8px 12px 8px 8px;
    text-align: center;
    cursor: pointer;
    transition: background-color .2s, opacity .2s;
  }
  & label:focus-within:has(:focus-visible) {
    background-color: rgb(232,240,254);
    text-align: center;
    cursor: pointer;
  }
  & input[type=checkbox] {
    display: inline-block;
    height: 0;
    width: 0;
    opacity: 0;
  }
  .checkbox-icon {
    display: inline-block;
    height: 24px;
    width: 24px;
    vertical-align: -.36em;
    background-image: url("icons.svg");
    background-position: -24px -48px;
    filter: var(--icon-inactive-filter);
    opacity: var(--icon-opacity-inactive);
  }
  input[type=checkbox]:checked + .checkbox-icon {
    background-position: 0 -48px;
    filter: var(--icon-checkbox-active-filter);
    opacity: var(--icon-opacity-active);
  }

  & button {
    position: relative;
    font-weight: 500;
    background-color: rgba(0,0,0,.06);
    border: none;
    cursor: pointer;
    transition: background-color .2s, box-shadow .2s;
  }
  & button:hover,
  & button:focus,
  &.loading button {
    background-color: #FBBC04;
  }
  & button:focus-visible {
    box-shadow: 0 0 0 4px rgba(251,188,4,.4);
  }
  & input + button {
    margin-top: 32px;
  }
  &.loading button {
    color: transparent;
  }

  & button .loading-spinner {
    inset: 50%;
    transform: translate(-50%,calc(-50% - 1em));
    display: none;
  }
  &.loading button .loading-spinner {
    display: inline-block;
  }
  & .loading-spinner,
  & .loading-spinner::before,
  & .loading-spinner::after {
    position: absolute;
    border-radius: 50%;
    width: .7em;
    height: .7em;
    animation-fill-mode: both;
    animation: loading-spinner 1.8s infinite ease-in-out;
  }
  & .loading-spinner {
    animation-delay: -0.16s;
  }
  & .loading-spinner::before,
  & .loading-spinner::after {
    content: '';
    top: 0;
  }
  & .loading-spinner::before {
    left: -1.3em;
    animation-delay: -0.32s;
  }
  & .loading-spinner::after {
    left: 1.3em;
  }

  &.loading input,
  &.loading label {
    opacity: .5;
  }
}
@keyframes loading-spinner {
  0%, 80%, 100% { box-shadow: 0 1em 0 -1.3em #fff; }
  40% { box-shadow: 0 1em 0 0 #fff; }
}

.notes-column {
  overflow-y: auto;
}

/* TODO :target? */
.card-shadow {
  position: relative;
  margin: 16px auto;
  max-width: 5.5in;
  border-radius: 24px;
  box-shadow: 0 2px 16px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.1);
  transition: box-shadow .2s;
}
.card-shadow:hover,
.card-shadow:focus-within {
  box-shadow: 0 2px 16px rgba(0,0,0,.15), 0 2px 4px rgba(0,0,0,.15);
}
.card-shadow::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: 0 0 0 1px rgba(255,255,255,.2) inset;
  border-radius: 24px;
  pointer-events: none;
  transition: box-shadow .2s;
}
.card-shadow:hover::after,
.card-shadow:focus-within::after {
  box-shadow: 0 0 0 2px rgba(255,255,255,.25) inset;
}
.card {
  /*padding-bottom: 16px;*/
  border-radius: 24px;
  background-color: var(--bg-color);
  color: var(--text-color);
  overflow: hidden;
}

.card > textarea { /* TODO */
  display: block;
  width: 100%;
  padding: 16px 24px;
  border: none;
  resize: none;
  outline: none;
  font-size: 16px;
  line-height: 24px;
  letter-spacing: .3px;
  background: transparent;
  color: inherit;
}