html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: #000;
    color: #ddd;
    font-family: courier, monospace;
    overflow: hidden;
    -webkit-text-size-adjust: 100%;
}

#plate {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
    background: #000;
}

a {
    color: #bbb;
}

.bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: calc(12px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right)) 12px calc(16px + env(safe-area-inset-left));
    font-size: 15px;
    z-index: 3;
    pointer-events: none;
}

.bar a {
    pointer-events: auto;
    color: #999;
    text-decoration: none;
    border-bottom: 1px solid #444;
    padding: 6px 0;
}

.bar a:hover, .bar a:focus-visible {
    color: #fff;
    border-color: #fff;
}

.start {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 24px;
    z-index: 2;
    pointer-events: none;
    transition: opacity 0.8s ease;
}

.start.gone {
    opacity: 0;
}

.start h1 {
    font-weight: normal;
    font-size: 28px;
    letter-spacing: 0.35em;
    text-transform: uppercase;
    margin: 0;
    text-shadow: 0 0 24px #000, 0 0 8px #000;
}

.start .tag {
    margin: 6px 0 34px;
    color: #999;
    letter-spacing: 0.12em;
    text-shadow: 0 0 12px #000;
}

#listen {
    pointer-events: auto;
    font-family: inherit;
    font-size: 17px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: #fff;
    background: rgba(0, 0, 0, 0.55);
    border: 1px solid #ccc;
    border-radius: 999px;
    padding: 16px 44px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

#listen:hover, #listen:focus-visible {
    background: #fff;
    color: #000;
    outline: none;
}

.start .hint {
    margin-top: 28px;
    color: #888;
    font-size: 13px;
    line-height: 1.7;
    text-shadow: 0 0 12px #000;
}

.toast {
    position: fixed;
    left: 50%;
    bottom: calc(76px + env(safe-area-inset-bottom));
    transform: translateX(-50%);
    max-width: min(420px, calc(100vw - 48px));
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid #333;
    color: #ccc;
    font-size: 13px;
    line-height: 1.6;
    padding: 10px 16px;
    text-align: center;
    z-index: 3;
    pointer-events: none;
    transition: opacity 0.4s;
}

.toast[hidden] {
    display: none;
}

.readout {
    position: fixed;
    left: 0;
    right: 0;
    bottom: calc(18px + env(safe-area-inset-bottom));
    display: flex;
    justify-content: center;
    align-items: baseline;
    gap: 14px;
    font-size: 14px;
    color: #eee;
    letter-spacing: 0.06em;
    z-index: 2;
    pointer-events: none;
    text-shadow: 0 0 10px #000, 0 0 3px #000;
}

.readout[hidden] {
    display: none;
}

.readout .dim {
    color: #888;
}

.readout .meter {
    display: inline-block;
    width: 48px;
    height: 3px;
    background: #222;
    vertical-align: middle;
    overflow: hidden;
}

.readout .meter span {
    display: block;
    height: 100%;
    width: 0;
    background: #ddd;
}

.about {
    position: fixed;
    inset: 0;
    z-index: 4;
    background: rgba(0, 0, 0, 0.88);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.about[hidden] {
    display: none;
}

.about_inner {
    max-width: 600px;
    margin: 0 auto;
    padding: calc(56px + env(safe-area-inset-top)) 20px calc(60px + env(safe-area-inset-bottom));
    line-height: 1.65;
    font-size: 15px;
    color: #ccc;
}

.about .close {
    float: right;
    color: #999;
    text-decoration: none;
    border-bottom: 1px solid #444;
    padding: 6px 0;
    margin-top: -40px;
}

.about .close:hover {
    color: #fff;
    border-color: #fff;
}

.about h2 {
    font-weight: normal;
    font-size: 20px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: #fff;
    margin: 0 0 20px;
}

.about h3 {
    font-weight: normal;
    font-size: 15px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #fff;
    margin: 34px 0 8px;
}

.about p {
    margin: 0 0 14px;
}

.about ol {
    padding-left: 22px;
    margin: 0 0 14px;
}

.about li {
    margin-bottom: 10px;
}

.about code {
    font-family: inherit;
    color: #fff;
    white-space: nowrap;
}

.about em {
    color: #fff;
}

.about .foot {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #333;
}

@media (max-width: 480px) {
    .start h1 { font-size: 22px; }
    .about_inner { font-size: 14px; }
}