:root {
    /* Previous layout proportions with anthracite background retained */
    --bg-anthracite: #2b2b2b;
    --panel: #323232;
    --panel-border: #4a4a4a;
    --text-primary: #f4f4f4;
    --text-secondary: #c6c6c6;
    --text-warning: #ffb3b8;
    --text-success: #8dde9d;
    --accent: #8ab4ff;
    --input-bg: #262626;
    --input-border: #6f6f6f;
    --input-disabled: #525252;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: var(--bg-anthracite);
    color: var(--text-primary);
    font: 400 16px/1.5 "IBM Plex Sans", system-ui, -apple-system, sans-serif;
}

main {
    width: min(100%, 27rem);
    padding: 1.25rem;
    border: 1px solid var(--panel-border);
    background: var(--panel);
}

h1 {
    margin: 0 0 0.5rem;
    font-size: 1.35rem;
    line-height: 1.2;
    font-weight: 600;
}

p {
    margin: 0 0 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.inputs {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.45rem;
}

input {
    width: 100%;
    aspect-ratio: 1;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-primary);
    text-align: center;
    font: 600 1.5rem/1 "IBM Plex Sans", system-ui, -apple-system, sans-serif;
}

input:focus {
    outline: 2px solid var(--accent);
    outline-offset: 0;
}

input:disabled {
    background: var(--input-disabled);
    color: var(--text-secondary);
}

#message,
#trycount {
    min-height: 1.4rem;
    margin-top: 0.85rem;
    font-size: 1rem;
}

#message {
    color: var(--text-warning);
}

#message.is-success {
    color: var(--text-success);
}

#trycount {
    color: var(--accent);
}