:root {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    --font-size-h1: 2rem;
    --font-size-h2: 1.6rem;
    --font-size-h3: 1.2rem;
    --space-xs: 2px;
    --space-s: 4px;
    --space-m: 8px;
    --space-l: 12px;
    --space-xl: 16px;
    --space-xxl: 24px;
    --space-xxxl: 48px;
    --min-page-inset: var(--space-l);
    --gutter: var(--space-xxl);
    --large-gutter: var(--space-xxxl);
    --header-gap: var(--space-xl);
    --page-header-height: 64px;
    --profilelist-item-width: 128px;
    --page-color: oklch(97.31% 0.004 91.45);
    --table-border-color: oklch(80% 0.004 91.45);
    --table-header-background-color: #00000010;
    --footer-background-color: oklch(93.5% 0.004 91.45);
    --primary-background-color: #ffffff;
    --primary-line-color: #cccccc;
    --default-link-color: #08A4BD;
    --primary-cta-color: rgb(197, 20, 17);
    --default-btn-background-color: #3c4b4c;
    --destructive-btn-background-color: #aa2222;
    --filled-btn-color: #ffffff;
    --form-background-color: #cccccc80;
    --button-border-radius: 8px;
    --picker-border-radius: 8px;
    --card-border-radius: 12px;
    --form-rectangular-border-radius: 4px;
    --dialog-border-radius: 24px;
    --text-color: #222222;
    --secondary-text-color: #444444d0;
    --loading-spinner: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke="white" stroke-width="10" fill="none"><circle cx="50" cy="50" r="40" stroke-dasharray="150 200"><animateTransform attributeName="transform" dur="0.75s" type="rotate" from="0 50 50" to="360 50 50" repeatCount="indefinite"/></circle></svg>');
}

* {
    box-sizing: border-box;
}

html {
    height: 100%;
    background-color: var(--page-color);
}

/* Enable dynamic type on iOS */
@supports (font: -apple-system-body) {
    @media (pointer: coarse) {
        :root { font: -apple-system-body; }
    }
}

body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    color: var(--text-color);
    touch-action: manipulation;
}

h1, h2, h3, h4, h5, h6, p {
    margin: var(--gutter) 0;
}
h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }

h1.error {
    font-size: 5vmax;
}

a {
    color: var(--default-link-color);
    text-decoration: none;
}

@media (hover: hover) {
    a:not(.btn, .wordlist__item, .profile__stats-item):hover {
        text-decoration: underline;
    }
}

button, input {
    font: inherit;
}

.hidden {
    display: none !important;
}

p.title, p, pre {
    font: inherit;
    line-height: 140%;
}

p.title {
    margin-bottom: 0;
    font-weight: bold;
}

p.title ~ :is(pre, p) { margin-top: 0; }

table {
    border-collapse: collapse;
}
td, th {
    padding: var(--space-l);
    text-align: left;
    vertical-align: top;
    border: 2px solid var(--table-border-color);
}
th {
    background-color: var(--table-header-background-color);
}

/**
 * Main
 */

main {
    z-index: 0;
    margin: 0 auto;
    padding: 0 max(var(--min-page-inset), env(safe-area-inset-right)) 0 max(var(--min-page-inset), env(safe-area-inset-left));
    width: 100%;
    max-width:960px;
    margin-bottom: auto;
}

.main--centered { text-align: center; }

.main--medium { max-width: 640px; }

.main--narrow { max-width: 480px; }

.main--error {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 80vh;
}

/**
 * Header
 */

.page__header {
    position: sticky;
    z-index: 10;
    top: 0;
    height: var(--page-header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--header-gap);
    background-color: var(--primary-background-color);
    border-bottom: 0.5px solid var(--primary-line-color);
    margin-bottom: var(--space-xxl);
}

.page__header > :first-child { margin-left: max(var(--min-page-inset), env(safe-area-inset-left)); }
.page__header > :last-child { margin-right: max(var(--min-page-inset), env(safe-area-inset-right)); }

.logo__link {
    --logo-size: 35px;
    margin-right: auto;
    padding: var(--space-l) var(--space-l) var(--space-l) calc(var(--logo-size) + var(--space-s));
    background-image: url('/icon/hzplogo_round_v0.svg');
    background-repeat: no-repeat;
    background-position: 0 50%;
    background-size: var(--logo-size);
    color: #000000;
    text-decoration: none;
    font-weight: 200;
}

.logo__link strong {
    font-weight: 800;
}

.page__header ~ main > :first-child {
    margin-top: 0;
}

/**
 * Footer
 */

.footer__wrapper {
    margin-top: var(--space-xxxl);
    padding: var(--min-page-inset) max(var(--min-page-inset), env(safe-area-inset-right)) max(var(--min-page-inset), env(safe-area-inset-bottom)) max(var(--min-page-inset), env(safe-area-inset-left));
    background-color: var(--footer-background-color);
}

footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    font-size: 90%;
    gap: var(--gutter);
}

.footer__language .picker__link::before {
    content: '';
    display: inline-block;
    width: 1em;
    height: 1em;
    margin-right: 0.5em;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none" stroke="%23666666" stroke-width="8"><circle cx="50" cy="50" r="45"/><ellipse cx="50" cy="50" rx="20" ry="45"/><path d="M 3 50 L 97 50 M 9 25 Q 50 35 91 25 M 9 75 Q 50 65 91 75"/></svg>');
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size: 1em 1em;
}

.footer__copyright {
    color: #00000060;
}

@media (max-width: 699px) {
    footer {
        flex-direction: column;
        align-items: start;
        gap: var( --header-gap);
    }
}

/**
 * Menu
 */

.menu__list {
    display: flex;
    padding-left: 0;
    list-style-type: none;
    gap: var(--header-gap);
}

.menu__link { color: var(--text-color); }

@media (hover: hover) {
    .page__header .picker__link:hover .profile__name { text-decoration: underline; }
}

/**
 * Profiles
 */

.profilelist {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: calc(0.4 * var(--profilelist-item-width));
    padding-left: 0;
    list-style-type: none;
}

.profilelist__item {
    width: var(--profilelist-item-width);
}

@media (max-width: 699px) {
    :root { --profilelist-item-width: 96px; }
}

.profile__link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.profile__link--vertical {
    flex-direction: column;
    gap: var(--space-m);
}

.profile__avatar {
    --size: 1em;
    --border-color: #444;
    display: inline-block;
    width: var(--size);
    height: var(--size);
    background-repeat: no-repeat;
    background-size: contain;
    background-color: white;
    border: 1px solid #00000020;
    border-radius: var(--size);
}

/* .profile__avatarbg--  { background-color: oklch(86% 0.01 90 / 0.8); } */
.profile__avatarbg--0 { background-color: oklch(80% 0.1 70 / 0.8); }
.profile__avatarbg--1 { background-color: oklch(80% 0.1 150 / 0.8); }
.profile__avatarbg--2 { background-color: oklch(80% 0.1 210 / 0.8); }
.profile__avatarbg--3 { background-color: oklch(80% 0.1 270 / 0.8); }
.profile__avatarbg--4 { background-color: oklch(80% 0.1 330 / 0.8); }

.profile__avatar--medium { --size: 2.2em; }
.profile__avatar--large { --size: 8em; }
.profile__avatar--extra-large { --size: 12em; }
@media (max-width: 699px) {
    .profile__avatar--large { --size: 6em; }
    .profile__avatar--extra-large { --size: 6em; }
}

.profile__avatar--left { margin-right: 0.5em; }
.profile__avatar--right { margin-left: 0.5em; }

.profile__avatar--edit {
    grid-column: 1;
    grid-row: 1;
}

.profile__avatar-container {
    display: grid;
}

.profile__avatar-overlay {
    grid-column: 1;
    grid-row: 1;
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    background-color: #00000060;
    border-radius: 50%;
}

/** Set limits to compact profile names based on screen size */
.profile__link .profile__name--compact {
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    max-width: 64ch;
}
@media (max-width: 379px) {
    .profile__link .profile__name--compact { max-width: 12ch; }
    .picker__link .profile__name--compact { max-width: 8ch; }
}
@media (min-width: 380px) and (max-width: 699px) {
    .profile__link .profile__name--compact { max-width: 24ch; }
    .picker__link .profile__name--compact { max-width: 16ch; }
}

.profile__name--large { font-size: 150%; }

@media (max-width: 699px) {
    .profile__name--large { font-size: 120%; }
}

/**
 * Picker
 */

details.picker {
    position: relative;
    display: block;
    cursor: pointer;
}

.picker--bordered {
    border: 1px solid #cccccc;
    padding: var(--space-m);
}

details.picker--bordered[open] {
    outline: 3px solid #222222;
}

summary.picker__link {
    display: flex;
    align-items: center;
    list-style: none;
}

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

summary.picker__link--marker::after {
    display: inline-block;
    content: '';
    margin-left: 0.5em;
    width: 1em;
    height: 1em;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke="%23222222" stroke-width="12" stroke-linecap="round" fill="none"><path d="M10 30 L50 70 L90 30"/></svg>');
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size: 0.8em 0.8em;
}

details.picker[open] summary.picker__link--marker::after {
    transform: rotate(180deg);
}

/* opposite direction for picker with content up */
.picker__content--up ~ .picker__link--marker::after { transform: rotate(180deg); }
details.picker[open] .picker__content--up ~ summary.picker__link--marker::after { transform: rotate(0deg); }

.picker__content {
    position: absolute;
    padding: var(--space-m);
    border-radius: var(--picker-border-radius);
    background-color: var(--primary-background-color);
    box-shadow: -10px 10px 200px #00000040, -5px 5px 10px #00000020;
    white-space: nowrap;
    list-style-type: none; /* for ul pickers */
}

.picker__content--down {
    margin: var(--space-m) 0 0 0;
    top: 100%;
}

.picker__content--up {
    margin: 0 0 var(--space-m) 0;
    bottom: 100%;
}

.picker__content--align-left { left: 0; }
.picker__content--align-right { right: 0; }

.picker a {
    display: flex;
    align-items: center;
    margin: var(--space-s);
    padding: var(--space-m) var(--space-xl);
    border-radius: var(--picker-border-radius);
    text-decoration: none;
    -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
}

/** Works fine on touch devices hence no media query */
.picker a:hover {
    background-color: #aaaaaa40;
    text-decoration: none;
}

/**
 * Buttons
 */

.btn {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: bold;
    padding: var(--space-m) var(--space-l);
    text-decoration: none;
    color: var(--default-btn-background-color);
    background-color: #00000000;
    border: 1px solid var(--default-btn-background-color);
    border-radius: var(--button-border-radius);
    text-wrap: nowrap;
    white-space: nowrap;
    text-align: center;
    cursor: pointer;
    transition: padding 0.1s;
}

.btn--filled {
    color: var(--filled-btn-color);
    background-color: var(--default-btn-background-color);
}

.btn--primary-cta {
    color: var(--filled-btn-color);
    background-color: var(--primary-cta-color);
    border-color: var(--primary-cta-color);
}

.btn--destructive {
    color: var(--filled-btn-color);
    background-color: var(--destructive-btn-background-color);
    border-color:  var(--destructive-btn-background-color);
}

.btn--busy {
    padding-left: 2em;
    background-image: var(--loading-spinner);
    background-repeat: no-repeat;
    background-size: 1.2em 1.2em;
    background-position: 0.4em 50%;
}

.btn--complete {
    padding-left: 2em;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke="white" stroke-width="12" fill="none"><path d="M10 60 L40 80 L90 10"/></svg>');
    background-repeat: no-repeat;
    background-size: 1.2em 1.2em;
    background-position: 0.4em 50%;
}

.btn--embedded-right {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    margin: var(--space-xs);
}

.btn--search {
    width: 3em;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke="white" stroke-width="8" stroke-linecap="round" fill="none"><circle cx="40" cy="40" r="30"/><line x1="65" y1="65" x2="90" y2="90" stroke-width="12"/></svg>');
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    background-position: 50% 50%;
}

.btn--clear-search {
    position: absolute;
    top: 0;
    right: 3em;
    bottom: 0;
    width: 3em;
    margin: var(--space-xs) var(--space-s);
    border: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" stroke-width="8" fill="%2300000020" stroke="%23888888" stroke-linecap="round"><circle cx="50" cy="50" r="40" stroke="none"/><line x1="35" y1="35" x2="65" y2="65"/><line x1="35" y1="65" x2="65" y2="35"/></svg>');
    background-repeat: no-repeat;
    background-size: 2em;
    background-position: 50% 50%;
}

.btn:disabled {
    cursor: not-allowed;
}

@media (hover: hover) {
    .btn:hover {
        opacity: 75%;
    }
}

/**
 * Forms
 */

form > *:not(:last-child) { margin-bottom: var(--space-xl); }

label + input { margin-top: var(--space-s); }

input {
    padding: var(--space-m);
    border-radius: var(--button-border-radius);
    border: none;
    background-color: #cccccc80;
    font-size: inherit;
}

input[type=text], input[type=email], input[type=password], input[type=search] { width: 100%; }

input[type=checkbox], input[type="radio"] {
    display: grid;
    place-content: center;
    padding: 0;
    font: inherit;
    width: 18px;
    height: 18px;
    appearance: none;
}

input[type=checkbox] { border-radius: var(--form-rectangular-border-radius) }
input[type="radio"] { border-radius: 50%; }

input[type=checkbox]::before, input[type=radio]::before {
    display: block;
    content: '';
}

input[type=radio]::before { width: 9px; height: 9px; }
input[type=checkbox]::before { width: 12px; height: 12px; }

input:checked::before { background-color: #000000; }

input[type=radio]:checked::before { border-radius: 50%; }
input[type=checkbox]:checked::before { clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%); }

label:has(input[type=checkbox]), label:has(input[type=radio]) {
    display: flex;
    align-items: center;
    gap: 0.2em;
}

fieldset {
    border: 1px solid var(--form-background-color);
    border-radius: var(--form-rectangular-border-radius);
}

fieldset a {
    display: block;
    margin-top: var(--space-m);
}

.btnrow {
    display: flex;
    justify-content: space-between;
    gap: var(--gutter);
}

@media (max-width: 379px) {
    .btnrow {
        flex-direction: column;
    }
}

.btnrow .btn {
    flex: 1 1;
}

input.error {
    color: red;
    background-color: #ff000020;
}

.errorbox {
    margin: var(--gutter) 0;
    padding: var(--space-m);
    border: 1px solid #ff0000;
    color: #ff0000;
}

label + .errorbox {
    margin: var(--space-m) 0;
}

input:not([type=checkbox]):focus-within {
    outline: 3px solid #222222;
}

input.error:focus-within {
    outline: 3px solid #ff0000;
}

/**
 * Dialogs
 */

dialog {
    padding: var(--space-xxl);
    border: none;
    border-radius: var(--dialog-border-radius);
}

dialog::backdrop {
    background-color: #00000080;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
}

dialog *:focus {
    outline: none;
}

/**
 * Layout
 */

.fixed-aside-grid {
    display: grid;
    grid-template-columns: 320px auto;
    gap: var(--large-gutter);
}

.two-columns-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gutter);
}

@media (max-width: 699px) {
    .fixed-aside-grid { grid-template-columns: 1fr; gap: var(--gutter); }
    .two-columns-grid { grid-template-columns: 1fr; }
}

.click-area-m {
    padding: var(--space-m);
    margin: calc(-1 * var(--space-m));
}

.click-area-l {
    padding: var(--space-l);
    margin: calc(-1 * var(--space-l));
}

.bottom-margin-s { margin-bottom: var(--space-s); }
.bottom-margin-m { margin-bottom: var(--space-m); }
.bottom-margin-l { margin-bottom: var(--space-l); }

@media (min-width: 700px) {
    .sticky-on-wide { position: relative; }
    .sticky-on-wide__sticky-content {
        position: sticky;
        top: calc(var(--page-header-height) + var(--gutter));
    }
}

.vertical-gutter {
    display: flex;
    flex-direction: column;
    gap: var(--gutter);
}

.push-right {
    margin-left: auto;
}

.scroll-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/**
 * Special errors.
 */

.nojs {
    display: flex;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: 0;
    background-color: #444444;
    color: #ffffff;
    place-items: center;
    place-content: center;
}

/**
 * Shared styles of components.
 */

.hanzi-style-tag {
    padding: var(--space-xs);
    background-color: #ffddbb;
    border-radius: var(--space-xs);
}

/**
 * Screen size rules for menu items.
 * Keep low in file to override display value.
 */

@media (max-width: 379px) {
    :root {
        --header-gap: var(--space-m);
    }
    .medium-screen { display: none; }
    .wide-screen { display: none; }
    .narrow-screen { display: inherit; }
}

@media (min-width: 380px) and (max-width: 699px) {
    .wide-screen { display: none; }
    .narrow-screen { display: inherit; }
    .medium-screen { display: inherit; }
}

@media (min-width: 700px) {
    .narrow-screen { display: none; }
    .medium-screen { display: none; }
    .wide-screen { display: inherit; }
}

/** index */

.screenshot {
    width: 100%;
    aspect-ratio: 750 / 1334;
    border: 10px solid black;
    border-radius: 24px;
}

.main--index {
    display: grid;
    grid-template-columns: auto 320px;
    gap: var(--gutter);
}

@media (max-width: 699px) {
    .main--index {
        grid-template-columns: 1fr;
    }
}