:root {
    color-scheme: dark;
    --bg: #1f2a44;
    --bg-deep: #131b30;
    --panel: #263451;
    --panel-soft: #2c3b5b;
    --line: #405170;
    --text: #f6f1e8;
    --muted: #b8c0cf;
    --accent: #e8dcc8;
    --accent-ink: #1f2a44
}

* {
    box-sizing: border-box
}

body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at 82% -12%, #425477 0, transparent 38%), linear-gradient(145deg, var(--bg) 0%, var(--bg-deep) 100%);
    color: var(--text);
    font: 16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    padding: clamp(28px, 7vw, 76px) 18px
}

main {
    max-width: 680px;
    margin: auto
}

main>img {
    display: block;
    width: min(82vw, 380px);
    height: auto;
    margin: 0 auto;
    opacity: .96;
    filter: brightness(0) saturate(100%) invert(71%) sepia(25%) saturate(888%) hue-rotate(2deg) brightness(91%) contrast(83%) drop-shadow(0 12px 24px rgb(5 10 22 / 28%))
}

p {
    max-width: 520px;
    margin: 0;
    color: var(--muted);
    font-size: 1.05rem;
    letter-spacing: .01em
}

section {
    margin-top: 12px;
    padding: clamp(20px, 4vw, 30px);
    background: rgb(38 52 81 / 82%);
    border: 1px solid rgb(137 153 184 / 24%);
    border-radius: 18px;
    box-shadow: 0 24px 70px rgb(5 10 22 / 28%), inset 0 1px rgb(255 255 255 / 6%);
    backdrop-filter: blur(16px)
}

fieldset {
    border: 0;
    padding: 0;
    margin: 0
}

legend {
    margin-bottom: 16px;
    color: var(--text);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase
}

.group {
    margin-bottom: 8px;
    border: 1px solid rgb(137 153 184 / 24%);
    border-radius: 14px;
    background: rgb(19 27 48 / 40%);
    overflow: hidden;
    transition: border-color .2s ease
}

.group:has(input:checked) {
    border-color: rgb(232 220 200 / 45%)
}

.group-head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px 15px
}

.group[data-collapsed="false"] .group-head {
    border-bottom: 1px solid rgb(137 153 184 / 16%)
}

.group-check {
    display: inline-flex;
    align-items: center;
    cursor: pointer
}

.group-check input {
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: var(--accent);
    cursor: pointer
}

.group-title {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: auto;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--text);
    font: 700 .92rem/1.25 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    text-align: left;
    box-shadow: none;
    cursor: pointer;
    transition: color .2s ease
}

.group-title:hover {
    background: transparent;
    box-shadow: none;
    transform: none;
    color: var(--accent)
}

.group-title small {
    display: block;
    margin-top: 1px;
    color: var(--muted);
    font-size: .75rem;
    font-weight: 500
}

.group-title:hover small {
    color: inherit
}

.chev {
    width: 20px;
    height: 20px;
    flex: none;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.2;
    stroke-linecap: round;
    stroke-linejoin: round;
    color: var(--muted);
    transition: transform .3s ease, color .2s ease
}

.group-title:hover .chev {
    color: var(--accent)
}

.group[data-collapsed="true"] .chev {
    transform: rotate(-90deg)
}

.group-body {
    display: grid;
    grid-template-rows: 1fr;
    transition: grid-template-rows .3s ease
}

.group[data-collapsed="true"] .group-body {
    grid-template-rows: 0fr
}

.group-body-inner {
    min-height: 0;
    overflow: hidden
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 15px
}

.channel {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 52px;
    padding: 13px 12px;
    border: 1px solid var(--line);
    border-radius: 11px;
    background: rgb(19 27 48 / 54%);
    color: var(--muted);
    font-size: .88rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease
}

.channel:hover {
    border-color: rgb(232 220 200 / 70%);
    color: var(--text);
    transform: translateY(-2px)
}

.channel:has(input:checked) {
    border-color: var(--accent);
    background: rgb(232 220 200 / 11%);
    color: var(--accent);
    box-shadow: 0 8px 20px rgb(5 10 22 / 16%)
}

.channel input {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--accent);
    cursor: pointer
}

button,
a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 17px;
    margin: 22px 8px 0 0;
    border: 1px solid transparent;
    border-radius: 9px;
    background: var(--accent);
    color: var(--accent-ink);
    font: 700 .88rem/1.2 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    text-decoration: none;
    cursor: pointer;
    transition: background .2s ease, border-color .2s ease, color .2s ease, transform .2s ease, box-shadow .2s ease
}

button:hover,
a:hover {
    background: #f3eadc;
    box-shadow: 0 10px 20px rgb(5 10 22 / 18%);
    transform: translateY(-2px)
}

a {
    border-color: rgb(232 220 200 / 65%);
    background: transparent;
    color: var(--accent)
}

a:hover {
    background: var(--accent);
    color: var(--accent-ink)
}

button:focus-visible,
a:focus-visible,
.channel:has(input:focus-visible) {
    outline: 3px solid rgb(232 220 200 / 45%);
    outline-offset: 3px
}

output {
    display: block;
    word-break: break-all;
    margin-top: 18px;
    padding-top: 15px;
    border-top: 1px solid rgb(137 153 184 / 20%);
    color: var(--muted);
    font: 12px/1.5 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace
}

@media(max-width:480px) {
    .grid {
        grid-template-columns: repeat(2, 1fr)
    }

    section {
        border-radius: 14px
    }

    .channel {
        font-size: .8rem
    }
}