:root {
    --size_0:  0.25rem;
    --size_1:  0.5rem;
    --size_2:  0.75rem;
    --size_3:  1.0rem;
    --size_4:  1.25rem;
    --size_5:  1.5rem;
    --size_6:  1.75rem;
    --size_7:  2.5rem;
    --size_8:  3.75rem;
    --size_9:  6.25rem;

    /*NOTE(daniel) minor third https://typescale.com/*/
    --size_h1:      2.986rem;
    --size_h2:      2.488rem;
    --size_h3:      2.074rem;
    --size_h4:      1.728rem;
    --size_h5:      1.440rem;
    --size_h6:      1.200rem;
    --size_normal:  1.200rem; /* NOTE(daniel) skip 1.0rem in for larger body text */
    --size_small:   1.000rem;
    --size_smaller: 0.833rem;
    /*--size_tiny:    0.694rem;*/
    /*TODO(daniel) use these sizes instead of the numbered sizes ?*/

    --transition_duration: 0.2s;
    /*--transition_duration: 3.0s;*/ /* NOTE(daniel) for debug */
}

* {
    box-sizing: border-box;
}

html {
    transition: all var(--transition_duration);
    background-color: var(--neutral_0);
    scroll-behavior: smooth;

}

body.light_theme {
    --primary:        #248143;
    --primary_bright: #54b193;
    --neutral_0: #f7f7f7;
    --neutral_1: #e0e0e0;
    --neutral_2: #c0c0c0;
    --neutral_3: #555555;
    --neutral_4: #333333;
    --neutral_5: #202020;
    --neutral_6: #151515;
    --neutral_7: #070707;

    --alert_info:    var(--primary_bright);
    --alert_warning: #cc8000;
}
body {
    --primary:        #68bd84;
    --primary_bright: #a8fdc4;
    --neutral_0: #000000;
    --neutral_1: #151515;
    --neutral_2: #202020;
    --neutral_3: #333333;
    --neutral_4: #555555;
    --neutral_5: #c0c0c0;
    --neutral_6: #e0e0e0;
    --neutral_7: #f7f7f7;

    --alert_info:    var(--primary_bright);
    --alert_warning: #ffb300;

    transition: all var(--transition_duration);
    background-color: var(--neutral_0);
    color:            var(--neutral_7);

    display: flex;
    align-items: center;
    justify-content: center;
    font-family: system-ui, sans-serif;
    font-size: var(--size_normal);
    margin: 0;
    height: 100%;

    /* NOTE(daniel) Always show the scrollbar, to prevent the all content jumping left and right when navigating 
       between pages with and without y-overflow. */
    overflow-y: scroll;
}


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

h1 { font-size: var(--size_h1); }
h2 { font-size: var(--size_h2); }
h3 { font-size: var(--size_h3); }
h4 { font-size: var(--size_h4); }
h5 { font-size: var(--size_h5); margin-bottom: var(--size_0); }
h6 { font-size: var(--size_h6); margin-bottom: var(--size_0); }


a {
  text-underline-position: under;
  text-underline-offset: 1px;

  transition: all var(--transition_duration);
  color: var(--primary);
  text-decoration-color: transparent; 
  text-decoration-thickness: 0; 
  transform: scale(1.00);
}

a:hover, a.active {
  color: var(--primary_bright);
}
a:hover {
  transform: scale(1.05);
  text-decoration-color: inherit; 
  text-decoration-thickness: 0.15em; 
}


/* TODO(daniel) do not hard-code domain */
a[href^="http"]:not([href*="danielgergely.net"]):not(.button_primary):not(.button_secondary):after
{
    content: "*";
}

img, audio, video, iframe {
    display: block;
    max-width: 90%;
    max-height: 600px;
    margin: var(--size_4) auto var(--size_4) auto;
    border: 1px solid var(--neutral_3);

    /* NOTE(daniel) for sane-looking alt-text in case the image does not load */
    font-size: var(--size_1);
    overflow: hidden;
}

/* NOTE(daniel) 2checkout cart iframe:
   Some properties are set above for embedded iframes (youtube, itch widget, etc.)
   But these must be reset for the cart overlay to display correctly.
*/
iframe#cart-iframe {
    all: initial;
}


p, li {
    line-height: 1.5;
}

::selection {
    transition: all var(--transition_duration);
    color: var(--neutral_0);
    background: var(--primary);
}

.container {
    width: 680px;
    min-width: 680px;
    height: 100%;
}


.site_header, .header{
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.site_header h1 {
    display: inline;
    margin: var(--size_3) 0 var(--size_3);

    transition: all var(--transition_duration);
    color: var(--neutral_6);
}

.site_header p {
    margin: 0;
    display: inline;
    font-size: var(--size_3);
    font-style: italic;
}

ul.nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    padding-inline-start: 0;
    margin: 0;
    padding: 0;
}

ul.menu_site {
    font-size: var(--size_4);
}

ul.menu_page {
    margin-top: var(--size_2);
    margin-bottom: var(--size_2);
    font-size: var(--size_3);
}

ul.footer {
    font-size: var(--size_smaller);
    margin-bottom: var(--size_smaller);
}

.nav li {
    display: inline-block;
    text-align: center;

    transition: all var(--transition_duration);
    color: var(--neutral_4);
    transform: scale(1);
}

.nav a {
    display: inline-block;
}

.content {
    margin-top:    var(--size_2);
    margin-bottom: var(--size_2);

    border-top: 0.5px;
    border-bottom: 0.5px;
    border-left: 0;
    border-right: 0;
    border-style: solid;
    border-color:  var(--neutral_3);

    padding-top:    var(--size_7);
    padding-bottom: var(--size_7);

    transition: all var(--transition_duration);
}

.alert {
    color: var(--alert_info);
    border-color: var(--alert_info);

    margin: var(--size_7) 0 var(--size_7) 0;
    padding:  0 var(--size_3) 0 var(--size_6);
    border: solid 1px ;
    border-left-width: var(--size_3);
    border-radius: var(--size_0);

    font-size: var(--size_normal);
}

.alert_warning {
    color: var(--alert_warning);
    border-color: var(--alert_warning);
}

.background {
    border-radius: var(--size_1);
    padding:  var(--size_6);
    margin: var(--size_6) 0 var(--size_6) 0;

    transition: all var(--transition_duration);
    background-color: var(--neutral_1);
}

.toc {
    border-radius: var(--size_1);
    padding:  var(--size_6);
    margin: var(--size_6) 0 var(--size_6) 0;

    transition: all var(--transition_duration);
    background-color: var(--neutral_1);
}

.toc p {
    font-weight: bold;
    font-size: var(--size_4);
    margin: 0 0 var(--size_1) 0;
}

.toc ul {
    margin: 0;
    padding-inline-start: var(--size_5);
    margin-block-start: 0;
}

.toc > ul {
    padding-inline-start: 0;
}

.toc li {
    list-style-type: none;
    font-size: var(--size_3);
}

ul.news {
    padding-inline-start: 0;
}
.news li{
    list-style-type: none;
}


a.button_primary, a.button_secondary {
  display: block;
  line-height: var(--size_7);
  text-decoration:  none;
  font-size: var(--size_3);
  border-radius: var(--size_0);
  text-align: center;
  width: var(--size_9);
}


a.button_primary {
    font-weight:      bold;
    background-color: var(--primary);
    color:            var(--neutral_0);
}
a.button_primary:hover {
    background-color: var(--primary_bright);
}

a.button_secondary {
    background-color: transparent;
    color:            var(--primary);
    border: solid 1px var(--primary);
}
a.button_secondary:hover {
    color: var(--primary_bright);
    border: solid 1px var(--primary_bright);
}


/* cards */
/* ===== */

div.card {
    position: relative;
    margin-bottom: var(--size_4);
}

a.card_link {
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border-radius: var(--size_1);

    background-color: var(--neutral_2);
}
a.card_link:hover {
    transform: scale(1);

    background-color: var(--neutral_3);
}

.light_theme a.card_link:hover {
    background-color: var(--neutral_1);
}

.card_content {
    position: relative;
    display: grid;
    grid-gap: var(--size_3);
    padding: var(--size_3);
    grid-template-columns: var(--size_9) 1fr var(--size_9);
    grid-template-rows: var(--size_7) var(--size_7);
    grid-template-areas:
        "image title   button_buy"
        "image summary button_learn_more";
    width: 100%;
    pointer-events: none;
    overflow: hidden;

}

.card_content h2 {
    margin-top: 0;
    grid-area: title;
    font-size: var(--size_h5);
}

.card_content p {
    margin-top: 0;
    grid-area: summary;
    font-size: var(--size_small);

    white-space: nowrap;
    overflow-x: hidden;
    text-overflow: ellipsis;

    transition: all var(--transition_duration);
    color: var(--neutral_6);
}


.card_content .button_primary {
    grid-area: button_buy;
}
.card_content .button_secondary {
    grid-area: button_learn_more;
}

.card a {
    pointer-events: auto;
}

.card img {
    max-width: 500px;
    object-fit: cover;
    width: 100%;
    height: 100%;
    border-radius: var(--size_0);
    grid-area: image;
    margin: 0;

}

@keyframes fade_in {
    0%     { opacity: 0.0; }
    25%    { opacity: 0.0; }
    100%   { opacity: 1.0; }
}

.newsletter {
    height: 100px;
    margin: var(--size_7);

   animation: 0.5s linear 0s 1 fade_in;
}