:root {
    --color-bg: rgb(192, 218, 239);
    --color-navbar: #2b2828;
    --color-accent: #226cc6;
    --color-text: #202020;
    --color-text-light: #f2f2f2;
    --content-max: 1100px;
    --radius: 10px;
    --shadow: 0 3px 12px rgba(0, 0, 0, 0.15);
    --font-main: "Quicksand", Arial, Helvetica, sans-serif;
}

@font-face {
    font-family: "Quicksand";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("fonts/quicksand-400.woff2") format("woff2");
}
@font-face {
    font-family: "Quicksand";
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url("fonts/quicksand-600.woff2") format("woff2");
}
@font-face {
    font-family: "Quicksand";
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url("fonts/quicksand-700.woff2") format("woff2");
}

* { box-sizing: border-box; }

body {
    background-color: var(--color-bg);
    font-family: var(--font-main);
    color: var(--color-text);
    margin: 0px;
    padding-bottom: 60px;
    line-height: 1.65;
}

main {
    margin: auto;
    max-width: var(--content-max);
    padding: 36px 30px 20px;
}

h1 {
    font-size: 2.1rem;
    margin-bottom: 0.6em;
}

h2 {
    font-size: 1.4rem;
    margin-top: 1.6em;
    margin-bottom: 0.5em;
}

p {
    margin-bottom: 1em;
}

ul {
    margin-bottom: 1em;
    padding-left: 1.4em;
}

li {
    margin-bottom: 0.4em;
}

a { color: inherit; }

a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ---------- Navbar ---------- */

.navbar {
    background-color: var(--color-navbar);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: var(--content-max);
    margin: auto;
    position: relative;
    display: flex;
    align-items: center;
}

.menuitems {
    display: flex;
    flex-wrap: wrap;
}

.navbar a {
    color: var(--color-text-light);
    text-align: center;
    padding: 14px 14px;
    text-decoration: none;
    font-size: 17px;
    transition: background-color .3s ease, color .3s ease;
}

.navbar a:hover,
.navbar a:focus-visible {
    background-color: #ddd;
    color: black;
    outline-offset: -2px;
}

.navbar a.active {
    background-color: var(--color-accent);
    color: white;
}

.nav-toggle { display: none; }

.nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: 14px 16px;
    margin-left: auto;
}

.nav-toggle-label span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text-light);
    margin: 5px 0;
}

@media (max-width: 700px) {
    .nav-toggle-label { display: block; }

    .menuitems {
        display: none;
        flex-direction: column;
        width: 100%;
    }

    .navbar a {
        text-align: left;
    }

    .nav-toggle:checked ~ .menuitems {
        display: flex;
    }
}

/* ---------- Home intro / CV list ---------- */

.cv-list {
    list-style: none;
    margin: 0 0 1.4em;
    padding: 0;
}

.cv-list li {
    display: flex;
    margin-bottom: 6px;
    font-size: 0.95rem;
}

.cv-years {
    flex: 0 0 95px;
    font-weight: 600;
    color: var(--color-accent);
    white-space: nowrap;
}

.cv-detail {
    flex: 1 1 auto;
}

/* ---------- Images & figures ---------- */

main img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1.6em auto;
    object-fit: cover;
    box-shadow: var(--shadow);
}

.img-xs { width: 20%; }
.img-md { width: 50%; }
.img-lg { width: 60%; }
.img-xl { width: 70%; }

@media (max-width: 600px) {
    .img-xs, .img-md, .img-lg, .img-xl {
        width: 90%;
    }
}

/* ---------- Responsive embeds (e.g. lichess iframe) ---------- */

.embed-wrap {
    max-width: 600px;
    width: 100%;
    aspect-ratio: 600 / 397;
    margin: 1.6em auto;
}

.embed-wrap iframe {
    width: 100%;
    height: 100%;
    border: 0;
    box-shadow: var(--shadow);
    display: block;
}

/* ---------- Contact table ---------- */

.contact-table td {
    padding: 6px 12px 6px 0;
}

.contact-table i {
    color: var(--color-accent);
}

/* ---------- Footer ---------- */

.site-footer {
    max-width: var(--content-max);
    margin: 40px auto 0;
    padding: 20px 30px 0;
    border-top: 1px solid rgba(0, 0, 0, 0.15);
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: rgba(0, 0, 0, 0.65);
}

.site-footer a {
    text-decoration: none;
    color: rgba(0, 0, 0, 0.65);
}

.site-footer a:hover,
.site-footer a:focus-visible {
    color: var(--color-accent);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

/* ---------- Legal notice / privacy (Contact page) ---------- */

.legal-section {
    margin-top: 2.5em;
    padding-top: 1.4em;
    border-top: 1px solid rgba(0, 0, 0, 0.15);
    font-size: 0.85rem;
    color: rgba(0, 0, 0, 0.7);
}

.legal-section h2 {
    font-size: 1rem;
    margin-top: 0;
    margin-bottom: 0.6em;
}

.legal-section p {
    margin-bottom: 0.8em;
}

/* ---------- Click-to-load embed (e.g. lichess iframe) ---------- */

.embed-load-btn {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: var(--color-navbar);
    color: var(--color-text-light);
    border: none;
    font-family: var(--font-main);
    font-size: 1rem;
    text-align: center;
    padding: 20px;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: background-color 0.25s ease;
}

.embed-load-btn:hover,
.embed-load-btn:focus-visible {
    background: var(--color-accent);
}

.embed-note {
    font-size: 0.8rem;
    color: rgba(0, 0, 0, 0.6);
    margin-bottom: 0.5em;
}

/* ---------- Back to top ---------- */

.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    padding: 10px 14px;
    border: none;
    background: var(--color-navbar);
    color: var(--color-text-light);
    font-size: 18px;
    line-height: 1;
    font-family: var(--font-main);
    cursor: pointer;
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity .25s ease, transform .25s ease, background-color .25s ease;
    z-index: 90;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
    background: var(--color-accent);
}

/* ---------- Accordion (Research page) ---------- */

.accordion {
    margin-top: 1.6em;
    border-bottom: 1px solid rgba(0, 0, 0, 0.15);
}

.accordion-item {
    border-top: 1px solid rgba(0, 0, 0, 0.15);
}

.accordion-summary {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 4px;
    cursor: pointer;
    list-style: none;
}

.accordion-summary::-webkit-details-marker {
    display: none;
}

.accordion-summary::marker {
    content: "";
}

.accordion-arrow {
    flex: 0 0 auto;
    width: 0;
    height: 0;
    margin-top: 0.5em;
    border-left: 6px solid var(--color-accent);
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    transition: transform 0.25s ease;
}

.accordion-item[open] > .accordion-summary > .accordion-arrow {
    transform: rotate(90deg);
}

.accordion-summary-text {
    display: flex;
    flex-direction: column;
    gap: 0.2em;
}

.accordion-summary-text h2 {
    margin: 0;
    font-size: 1.15rem;
}

.accordion-hint {
    color: rgba(0, 0, 0, 0.6);
    font-size: 0.9rem;
}

.accordion-body {
    display: grid;
    grid-template-rows: 0fr;
    overflow: hidden;
    transition: grid-template-rows 0.3s ease;
}

.accordion-item[open] > .accordion-body {
    grid-template-rows: 1fr;
}

.accordion-body-inner {
    min-height: 0;
    overflow: hidden;
    padding: 0 4px 0 24px;
}

.accordion-item[open] > .accordion-body > .accordion-body-inner {
    min-height: auto;
    overflow: visible;
}

.accordion-body-inner > *:first-child {
    margin-top: 0;
}

.accordion-body-inner > *:last-child {
    margin-bottom: 20px;
}

/* ---------- Geography quiz game ---------- */

#quiz-app {
    margin: 1.8em 0;
}

.quiz-screen {
    text-align: center;
}

.quiz-compass-icon {
    display: block;
    margin: 0 auto 0.5em;
    font-size: 100px;
    line-height: 1;
    color: var(--color-accent);
}

#quiz-menu h2 {
    margin-top: 0;
}

#quiz-menu p {
    max-width: 60ch;
    margin-left: auto;
    margin-right: auto;
}

.quiz-mode-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 1.4em;
}

.quiz-mode-btn {
    background: var(--color-navbar);
    color: var(--color-text-light);
    border: none;
    padding: 12px 22px;
    font-family: var(--font-main);
    font-size: 1rem;
    cursor: pointer;
    touch-action: manipulation;
    transition: background-color 0.25s ease;
}

.quiz-mode-btn:hover,
.quiz-mode-btn:focus-visible {
    background: var(--color-accent);
}

.quiz-status {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.6em;
    text-align: left;
}

#quiz-city-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-accent);
}

#quiz-total {
    font-size: 0.9rem;
    color: rgba(0, 0, 0, 0.6);
}

.quiz-canvas-wrap {
    width: 100%;
}

#quiz-canvas {
    display: block;
    width: 100%;
    cursor: crosshair;
    touch-action: manipulation;
    box-shadow: var(--shadow);
}

.quiz-result {
    margin-top: 1em;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.55);
    border-left: 4px solid var(--color-accent);
    text-align: left;
}

.quiz-result p {
    margin: 0 0 1em;
}

#quiz-next-btn,
#quiz-restart-btn {
    background: var(--color-accent);
    color: #fff;
    border: none;
    padding: 12px 22px;
    font-family: var(--font-main);
    font-size: 1rem;
    cursor: pointer;
    touch-action: manipulation;
    transition: background-color 0.25s ease;
}

#quiz-next-btn:hover,
#quiz-next-btn:focus-visible,
#quiz-restart-btn:hover,
#quiz-restart-btn:focus-visible {
    background: var(--color-navbar);
}

#quiz-end h2 {
    margin-top: 0;
}