/* Variables */
:root {
    /* Base */

    /* Fonts */
    --font-base: system-ui, "Segoe UI", Roboto, Helvetica, Arial;
    --font-emoji: emoji, "Apple Color Emoji", "Segoe UI Emoji";

    /* Headings (default) */
    --fs-h1: 28px;
    --ls-h1: -1px;
    --lh-h1: 1;
    --fs-h2: 28px;
    --fs-h3: 22px;
    --fs-h4: 18px;

    /* Headings (>=800px) */
    --fs-h2-lg: 32px;
    --fs-h3-lg: 26px;
    --fs-h4-lg: 20px;

    /* Body */
    --lh-base: 1.5;
    --fs-base: 16px;

    /* Footer */
    --fs-footer: 15px;

    /* Colors */
    --color-bg: #fefefe;
    --color-text: #111111;
    --color-text-secondary: #3f3f3f;
    --color-muted: #828282;
    --color-link: #2a7ae2;
    --color-link-visited: #1756a9;
    --color-link-hover: #111111;
    --color-footer-border: #e8e8e8;

    /* Container */
    --container-sm: 800px;
    --container-lg: 960px;
    --container-pad-sm: 15px;
    --container-pad-lg: 30px;

    /* List */
    --list-indent: 30px;

    /* Footer boder */
    --border-footer: 1px;

    /* Components */

    /* Research */
    --research-border-w: 4px;
    --research-border-color: #0066cc;

    /* Project */
    --project-border-color: #eaeaea;
    --project-bg: #f8f8f8;
    --project-pad: 20px;
    --project-radius: 8px;
    --project-border-w: 2px;

    /* Education */
    --edu-pad-y: 10px;
    --edu-pad-x: 15px;

    /* Tooltip */
    --tooltip-pad-y: 5px;
    --tooltip-pad-x: 10px;
    --tooltip-bottom: 125%;
    --tooltip-left: 50%;
    --tooltip-border-w: 1px;
    --tooltip-radius: 6px;
    --tooltip-translate-x: -50%;
    --tooltip-transition: 0.25s;
    --tooltip-color-bg: #555555;
    --tooltip-color-text: white;
    --tooltip-color-underline: dimgrey;

    /* Publication */
    --pub-color-link: #0d6efd;
    --pub-color-link-hover: #0a58ca;

    --pub-color-bg: #f8f9fa;
    --pub-color-border: #e8e8e8;
    --pub-radius: 5px;
    --pub-border-w: 1px;
    --pub-abs-fs: 0.9em;
    --pub-bib-fs: 0.85em;

    /* Derived (responsive) variables */
    --container-max: calc(var(--container-sm) - var(--container-pad-sm) * 2);
    --fs-h2-current: var(--fs-h2);
    --fs-h3-current: var(--fs-h3);
    --fs-h4-current: var(--fs-h4);
}

@media (width >= 800px) {
    :root {
        --container-max: calc(
            var(--container-lg) - (var(--container-pad-lg) * 2)
        );
        --fs-h2-current: var(--fs-h2-lg);
        --fs-h3-current: var(--fs-h3-lg);
        --fs-h4-current: var(--fs-h4-lg);
    }
}

/* Reset */
*,
*::before,
*::after {
    margin: 0;
    border: none;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

/* Layout */
body {
    color: var(--color-text);
    background-color: var(--color-bg);
    font-weight: normal;
    font-size: var(--fs-base);
    font-family: var(--font-base), var(--font-emoji);
    line-height: var(--lh-base);
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-pad-sm);
}

main {
    margin-block: 30px;
}

footer {
    border-top: var(--border-footer) solid var(--color-footer-border);
    padding-block: 30px;
    font-size: var(--fs-footer);
    color: var(--color-muted);
}

h1,
h2,
h3,
h4,
h5,
h6,
p,
pre {
    margin-block: 15px;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
}
main h1 {
    font-size: var(--fs-h1);
    letter-spacing: var(--ls-h1);
    line-height: var(--lh-h1);
}
main h2 {
    font-size: var(--fs-h2-current);
}
main h3 {
    font-size: var(--fs-h3-current);
}
main h4 {
    font-size: var(--fs-h4-current);
}

/* Links */
a {
    color: var(--color-link);
    text-decoration: none;
}
a:visited {
    color: var(--color-link-visited);
}
a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

/* Lists */
ul,
ol {
    margin-inline-start: var(--list-indent);
}

/* Author */
.author {
    color: var(--color-text-secondary);
    display: grid;
    grid-template-columns: 30% 70%;
    margin-block: 30px;
}

.author .author-avatar {
    margin-block: auto;
    padding-block: 10px;
    padding-inline: 15px;
}
.author .author-info {
    padding-block: 10px;
    padding-inline: 15px;
}

.author .author-info .author-name {
    margin-block: 15px;
}
.author .author-info .author-contact {
    list-style: none;
    margin-inline-start: 0;
    margin-block: 8px;
}
.author .author-info > p {
    margin-block: 6px;
}

@media (width >= 800px) {
    .author .author-avatar {
        width: auto;
    }
}

/* Research */
.research {
    border-inline-start: var(--research-border-w) solid
        var(--research-border-color);
    padding-left: 15px;
    margin-block: 20px;
}

/* Projects */
.project {
    border: var(--project-border-w) solid var(--project-border-color);
    border-radius: var(--project-radius);
    background-color: var(--project-bg);
    padding: 20px;
}
.project > p {
    margin-block: 10px;
}
.project > ul {
    margin-block-end: 10px;
}

/* Education */
.edu {
    color: var(--color-table-text);
    width: 100%;
    border-collapse: collapse;
}
.edu :is(th, td) {
    padding: var(--edu-pad-y) var(--edu-pad-x);
}

/* Tooltip */
.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
    border-block-end: var(--tooltip-border-w) dashed
        var(--tooltip-color-underline);
}
.tooltip .tooltip-text {
    /* positioning */
    position: absolute;
    z-index: 1;
    inset-block-end: var(--tooltip-bottom);
    inset-inline-start: var(--tooltip-left);
    transform: translateX(var(--tooltip-translate-x));

    /* box */
    inline-size: max-content;
    min-inline-size: 16ch;
    max-inline-size: min(26ch, 90vw);
    border-radius: var(--tooltip-radius);
    padding: var(--tooltip-pad-y) var(--tooltip-pad-x);

    /* Typography */
    color: var(--tooltip-color-text);
    background-color: var(--tooltip-color-bg);
    text-align: center;

    /* visibility & animation */
    opacity: 0;
    visibility: hidden;
    transition-property: opacity;
    transition-duration: var(--tooltip-transition);
}
.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Publication Card */
.pub .pub-toggle-link {
    color: var(--pub-color-link);
    text-decoration: none;
    cursor: pointer;
    font: inherit;
}
.pub .pub-toggle-link:is(:hover, :focus-visible) {
    text-decoration: underline;
    color: var(--pub-color-link-hover);
    outline: none;
}
.pub :is(.pub-abs, .pub-bib) {
    display: none;
    background-color: var(--pub-color-bg);
    border: var(--pub-border-w) solid var(--pub-color-border);
    margin-block: 10px;
    padding: 10px;
    border-radius: var(--pub-radius);
    white-space: pre-line;
    overflow-wrap: break-word;
}
.pub:has(.pub-toggle-abs:checked) .pub-abs {
    display: block;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    font-size: var(--pub-abs-fs);
}
.pub:has(.pub-toggle-bib:checked) .pub-bib {
    display: block;
    font-family: monospace;
    font-size: var(--pub-bib-fs);
}