:root {
    /*=== Colors ===*/
    --background-color: #f5f7fb;
    --background-white: #ffffff;
    --background-medium: #eef3f8;
    --background-active: #dbeafe;
    --text-color: #1f2937;
    --border-color-light: #dbe2ea;
    --border-color-medium: #c7d2de;
    --border-color-active: #60a5fa;
    --outline-focus-visible: #2563eb;

    /*=== Sizes ===*/
    --border-radius: 10px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;
    background-color: var(--background-color);
    color: var(--text-color);
}

.ui-demo {
    width: min(900px, calc(100% - 32px));
    margin: 40px auto;
}

.ui-demo__header {
    margin-bottom: 32px;
}

.ui-demo__title {
    margin: 0 0 12px;
    font-size: 2rem;
}

.ui-demo__intro {
    margin: 0;
    max-width: 65ch;
}

.tabs {
    margin-bottom: 40px;
    padding: 24px;
    background-color: var(--background-white);
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius);
}

.tabs__heading {
    margin: 00 16px;
    font-size: 1.5rem;
}

.tabs__list {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.tabs__button {
    padding: 12px 18px;
    border: 1px solid var(--border-color-medium);
    border-radius: var(--border-radius);
    background-color: var(--background-white);
    color: var(--text-color);
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.tabs__button:hover {
    background-color: var(--background-medium);
}

.tabs__button:focus-visible {
    outline: 3px solid var(--outline-focus-visible);
    outline-offset: 2px;
}

.tabs__button--active {
    background-color: var(--background-active);
    border-color: var(--border-color-active);
}

.tabs__panel {
    padding: 20px;
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius);
    background-color: var(--background-medium);
}

.tabs__panel-title {
    margin: 0 0 12px;
    font-size: 1.2rem;
}

.tabs__panel-text {
    margin: 0;
}

.accordion {
    padding: 24px;
    background-color: var(--background-white);
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius);
}

.accordion__heading {
    margin: 0 0 16px;
    font-size: 1.5rem;
}

.accordion__item + .accordion__item {
    margin-top: 12px;
}

.accordion__title {
    margin: 0;
}

.accordion__trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border-color-medium);
    border-radius: var(--border-radius);
    background-color: var(--background-white);
    color: var(--text-color);
    text-align: left;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.accordion__trigger-label {
    pointer-events: none;
}

.accordion__trigger:hover {
    background-color: var(--background-medium);
}

.accordion__trigger:focus-visible {
    outline: 3px solid var(--outline-focus-visible);
    outline-offset: 2px;
}

.accordion__trigger--open {
    background-color: var(--background-color);
    border-color: border var(--border-color-active);
}

.accordion__icon svg {
    width: 24px;
    height: 24px;
}

.accordion__icon {
    display: inline-block;
    margin-left: 16px;
    transition: transform 0.3s ease;
    transform: rotate(0deg);
    pointer-events: none;
}

.accordion__trigger--open .accordion__icon {
    transform: rotate(180deg);
}

.accordion__panel {
    margin-top: 8px;
    border: 1px solid var(--border-color-light);
    border-radius: var(--border-radius);
    background-color: var(--background-medium);
    overflow: hidden;
    height: 0;
    opacity: 0;
    transition: height 0.3s ease, opacity 0.3s ease;
}

.accordion__panel--open {
    opacity: 1;
}

.accordion__content {
    padding: 16px 18px;
}

.accordion__text {
    margin: 0;
}