css 3d单选表单

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html

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* {
    border: 0;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
:root {
    --bg: #e3e4e8;
    --fg: #17181c;
    --formBg: #fff;
    --radioBg: #fff;
    --radioBgActive: #e3e4e8;
    --radioBorder: #c7cad1;
    --radioBorderActive: #c7cad1;
    --radioSide: #c7cad1;
    --primary1: #0b46da;
    --primary2: #255ff4;
    --primary3: #5583f6;
    --primary4: #86a6f9;
    --depth: -4.5em;
    --ballDiam: 0.75em;
    --xAngle: -30deg;
    --yAngle: 45deg;
    font-size: calc(16px + (24 - 16)*(100vw - 320px)/(1280 - 320));
}
body, h3, input {
    color: var(--fg);
    font: 1em/1.5 Hind, sans-serif;
}
body, form, form h3, form label {
    transform-style: preserve-3d;
}
body {
    background: var(--bg);
    overflow-x: hidden;
    padding-top: 1.5em;
    height: 100vh;
    text-align: center;
}
h3 {
    font-weight: bold;
}
input[type=checkbox] {
    margin-right: 0.375em;
}
/* Layer setup */
form {
    box-shadow: 0 0 0 0.1em var(--radioBorder) inset;
    max-width: 17em;
    margin: 4.5em auto 1.5em auto;
    padding: 1.5em;
    text-align: left;
    transform: rotateX(0) rotateY(0) translateZ(calc(var(--depth) / -2));
    transition: transform 0.25s linear;
}
form:before, form label:before, form h3:before, .dot, .dot-shadow {
    position: absolute;
}
form:before, form input[type=radio], form label:before, form h3:before {
    transform: translateZ(var(--depth));
}
form:before {
    background: var(--formBg);
    content: "";
    display: block;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
input[type=checkbox]:checked ~ form {
    transform: rotateX(var(--xAngle)) rotateY(var(--yAngle)) translateZ(calc(var(--depth) / -2));
}
/* Radios */
form input[type=radio], form span, form label:before, form h3:before {
    transition: all 0.15s linear;
}
form input[type=radio], span {
    border-radius: 50%;
}
form input[type=radio] {
    background: var(--radioBg);
    box-shadow:
        0 0 0 var(--radioSide),
        0 0 0 0.1em var(--radioBorder) inset,
        0 0 0 #0003;
    margin-right: 0.5em;
    width: 1.5em;
    height: 1.5em;
    -webkit-appearance: none;
    appearance: none;
}
input[type=checkbox]:checked ~ form input[type=radio] {
    box-shadow:
        -0.25em -0.25em 0 var(--radioSide),
        0 0 0 0.1em var(--radioBorder) inset,
        -0.25em -0.25em 0.25em #0005;
}
form input[type=radio]:active, form input[type=radio]:focus {
    background: var(--radioBgActive);
    box-shadow:
        0 0 0 var(--radioSide),
        0 0 0 0.1em var(--radioBorderActive) inset,
        0 0 0 #0003;
}
input[type=checkbox]:checked ~ form input[type=radio]:active, input[type=checkbox]:checked ~ form input[type=radio]:focus {
    box-shadow:
        -0.25em -0.25em 0 var(--radioSide),
        0 0 0 0.1em var(--radioBorderActive) inset,
        -0.25em -0.25em 0.25em #0005;
}
form input[type=radio]:focus {
    outline: transparent;
}
/* Text shadows */
form h3 {
    position: relative;
}
form label {
    cursor: pointer;
    display: flex;
    margin: 0.75em 0;
    position: relative;
    -webkit-tap-highlight-color: transparent;
}
form label:before, form h3:before {
    color: transparent;
    content: attr(data-text);
    top: 0;
    text-shadow: 0 0 0.25em transparent;
    transition-delay: 0.15s;
}
form label:before {
    left: 2em;
}
input[type=checkbox]:checked ~ form label:before, input[type=checkbox]:checked ~ form h3:before {
    text-shadow: 0 0 0.25em #0005;
    transition-delay: 0;
}
form h3:before {
    top: 0;
    left: 0;
}
/* Dots */
.dot, .dot-shadow {
    display: block;
    pointer-events: none;
    top: 0.375em;
    left: 0.375em;
    width: var(--ballDiam);
    height: var(--ballDiam);
}
.dot {
    background: var(--primary2);
    box-shadow:
        -0.2em -0.2em 0.4em var(--primary1) inset,
        0 0.2em 0.4em var(--primary3) inset;
    transform: translateZ(var(--depth)) rotateY(0) rotateX(0) scale(0);
}
form input[type=radio]:active ~ .dot, 
form input[type=radio]:focus ~ .dot {
    background: var(--primary3);
    box-shadow:
        -0.2em -0.2em 0.4em var(--primary2) inset,
        0 0.2em 0.4em var(--primary4) inset;
}
form input[type=radio]:checked ~ .dot {
    transform: translateZ(calc(var(--ballDiam) / -2)) rotateY(0) rotateX(0) scale(1);
}
input[type=checkbox]:checked ~ form input[type=radio] ~ .dot {
    transform: translateZ(var(--depth)) rotateY(calc(var(--yAngle) * -1)) rotateX(calc(var(--xAngle) * -1)) scale(0);
}
input[type=checkbox]:checked ~ form input[type=radio]:checked ~ .dot {
    transform: translateZ(calc(var(--ballDiam) / -2)) rotateY(calc(var(--yAngle) * -1)) rotateX(calc(var(--xAngle) * -1)) scale(1);
}
/* Dot shadows */
.dot-shadow {
    background: radial-gradient(100% 100%,#000,#0000 50%);
    opacity: 0.9;
    transform: translateZ(var(--depth)) scale(0);
}
input[type=radio]:checked ~ .dot-shadow {
    opacity: 0.4;
    transform: translateZ(var(--depth)) scale(1);
}
/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #17181c;
        --fg: #e3e4e8;
        --formBg: #2e3138;
        --radioBg: #454954;
        --radioBgActive: #5c6270;
        --radioBorder: #454954;
        --radioBorderActive: #5c6270;
        --radioSide: #17181c;
        --primary1: #255ff4;
        --primary2: #5583f6;
        --primary3: #86a6f9;
        --primary4: #b6cafb;
    }
}

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