* {
    box-sizing: border-box;
}

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

html, body {
    background: #ffffff;
    color: #000000;
}

html.inverted {
    filter: invert(1);
}

.mode-toggle {
    position: fixed;
    top: 0.75rem;
    right: 0.75rem;
    z-index: 100;
    background: #fff;
    color: #000;
    border: 1px solid #000;
    padding: 0.35rem 0.7rem;
    font-family: inherit;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
}

.mode-toggle:hover {
    background: #000;
    color: #fff;
}

@media (max-width: 480px) {
    .mode-toggle {
        top: 0.5rem;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
    }
}

body {
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.5;
    max-width: 700px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

.ticker {
    overflow: hidden;
    white-space: nowrap;
    font-size: 1rem;
    letter-spacing: 0.1em;
    margin: 0.75rem 0;
    border-top: 3px double #000;
    border-bottom: 3px double #000;
    padding: 0.35rem 0;
}

.banner-grid {
    --cell-size: 4px;
    display: grid;
    gap: 1px;
    justify-content: center;
    margin: 1rem 0 0.5rem;
    max-width: 100%;
    overflow-x: auto;
}

.banner-grid .cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background: transparent;
}

.banner-grid .cell.on {
    background: #000;
}

@media (min-width: 480px) {
    .banner-grid {
        --cell-size: 5px;
    }
}

@media (min-width: 700px) {
    .banner-grid {
        --cell-size: 8px;
    }
}

.subtitle {
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-size: 0.95rem;
    margin: 0 0 1rem;
    min-height: 1.4em;
}

.cursor {
    display: inline-block;
    animation: blink 1s steps(1) infinite;
}

@keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

h1 {
    font-size: 1.5rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin: 0.5rem 0 0.25rem;
}

h2 {
    font-size: 1rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin: 2rem 0 0.75rem;
    border-bottom: 2px solid #000;
    padding-bottom: 0.25rem;
}

h2::before {
    content: "// ";
}

p {
    margin: 0 0 1rem;
}

p.note {
    font-size: 0.85rem;
    opacity: 0.65;
    margin-top: -0.5rem;
}

ul.about-list {
    list-style: none;
    margin: 0 0 1rem;
    padding: 0;
}

ul.about-list li {
    position: relative;
    padding-left: 1.3rem;
    margin-bottom: 0.75rem;
}

ul.about-list li::before {
    content: "\00BB";
    position: absolute;
    left: 0;
}

a {
    color: #000;
    text-decoration: underline;
}

a:hover {
    background: #000;
    color: #fff;
    text-decoration: none;
}

nav.site-nav {
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    text-transform: uppercase;
    font-size: 0.85rem;
}

ul.link-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

ul.link-list li {
    border: 1px solid #000;
    padding: 0.6rem 0.9rem;
    margin-bottom: 0.5rem;
}

ul.link-list li::before {
    content: "> ";
}


.panel {
    border: 3px double #000;
    padding: 1.25rem;
    margin: 1.25rem 0;
}

.panel label {
    display: block;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.35rem;
}

input, select {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #000;
    border-radius: 0;
    background: #fff;
    color: #000;
    font-family: inherit;
    font-size: 1rem;
}

button {
    background: #000;
    color: #fff;
    border: 1px solid #000;
    border-radius: 0;
    padding: 0.5rem 1.1rem;
    font-family: inherit;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
}

button:hover {
    background: #fff;
    color: #000;
}

button + button {
    margin-left: 0.6rem;
}

#qrcode {
    margin-top: 1.5rem;
    text-align: center;
}

#qrcode canvas, #qrcode img {
    border: 3px double #000;
    padding: 0.5rem;
    background: #fff;
}

footer {
    margin-top: 2.5rem;
    text-align: center;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}