/* 1色から明るい色と暗い色を作成する例 */
:root {
    --color--primary: hsl(210 80% 50%);

    --color--primary-light: color-mix(in srgb, var(--color--primary), white 50%);

    --color--primary-dark: color-mix(in srgb, var(--color--primary), black 50%);
}

.badge {
    display: inline-flex;
    border-radius: 4px;
    padding: 0.5em 1em;
    font-size: 0.9em;
}
.badge--primary {
    background: var(--color--primary);
    color: white;
}
.badge--primary-light {
    background: var(--color--primary-light);
}
.badge--primary-dark {
    background: var(--color--primary-dark);
    color: white;
}


/* button hover */
.buttons {
    display: flex;
    gap: 0.5em;
}
.btn {
    --btn-color: var(--color--primary);

    display: inline-flex;
    background-color: var(--btn-color);
    color: #fff;
    padding: 0.5em 1em;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: color-mix(in srgb, var(--btn-color), black 20% );
}

.btn--danger {
    --btn-color: hsl(10 80% 50%);
}
.btn--cancel {
    --btn-color: hsl(200 8% 50%);
}

/* alert box */
:root {
    --color-bg: #fff;
    --color--text: #333;
}

.color-box {
    --keycolor: currentColor;

    color: color-mix(in srgb, currentColor, var(--keycolor), 20%);
    background-color: color-mix(in srgb, transparent, var(--keycolor) 5%);
    --shadow-color: color-mix(in srgb, rgb(0 0 0 / 0.1), var(--keycolor) 20%);
    --border-color: color-mix(in srgb, transparent, var(--keycolor) 25%);

    display: flex;
    align-items: center;
    gap: 0.75em;
    padding: 1em;
    border-radius: 4px;
    border: solid 2px var(--border-color);
    box-shadow: 2px 4px 20px -8px var(--shadow-color);
}

.color-box__icon {
    flex-shrink: 0;
    width: 1.25em;
    aspect-ratio: 1/1;
    background-color: var(--keycolor);

    mask: var(--icon) no-repeat center / contain;
}

.color-box--alert {
    --keycolor: rgb(240 40 40);
    --icon: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 256 256"><path d="M148,200a20,20,0,1,1-20-20A20,20,0,0,1,148,200Zm-20-40a12,12,0,0,0,12-12V48a12,12,0,0,0-24,0V148A12,12,0,0,0,128,160Z"></path></svg>');
}
.color-box--check {
    --keycolor: rgb(50 180 60);
    --icon: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 256 256"><path d="M232.49,80.49l-128,128a12,12,0,0,1-17,0l-56-56a12,12,0,1,1,17-17L96,183,215.51,63.51a12,12,0,0,1,17,17Z"></path></svg>');
}
.color-box--help {
    --keycolor: rgb(40 100 220);
    --icon: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 256 256"><path d="M196,96c0,29.47-24.21,54.05-56,59.06V156a12,12,0,0,1-24,0V144a12,12,0,0,1,12-12c24.26,0,44-16.15,44-36s-19.74-36-44-36S84,76.15,84,96a12,12,0,0,1-24,0c0-33.08,30.5-60,68-60S196,62.92,196,96Zm-68,92a20,20,0,1,0,20,20A20,20,0,0,0,128,188Z"></path></svg>');
}

/* 相対色 */
:root {
    --color-from-primary-light: hsl(from var(--color--primary) h s calc(l + 25));

    --color--from-primary-dark: hsl(from var(--color--primary) h s calc(l - 25));
}
.badge--from-primary-light {
    background: var(--color-from-primary-light);
}
.badge--from-primary-dark {
    background: var(--color--from-primary-dark);
    color: white;
}