:root {
    --bg: #fff;
    --fg: #222;
    --card-bg: #f4f4f8;
    --card-fg: #222;
    --border: #bbb;
    --input-bg: #fff;
    --input-fg: #222;
}

.dark-mode {
    --bg: #0b1020;
    --fg: #e6edf3;
    --card-bg: #0b1020;
    --card-fg: #e6edf3;
    --border: #333;
    --input-bg: #0b1020;
    --input-fg: #e6edf3;
}

body {
    font: 14px system-ui, sans-serif;
    margin: 2rem;
    background: var(--bg);
    color: var(--fg);
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: .6rem 0
}
.row > * {
    margin-bottom: .4rem;
    margin-right: .4rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: .8rem;
    margin-top: 1rem
}

.card {
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: .5rem;
    background: var(--card-bg);
    color: var(--card-fg);
}

.kv {
    font-size: 13px;
    opacity: .9
}

.v {
    font-size: 20px;
    font-weight: 600
}

pre {
    background: var(--card-bg);
    color: var(--card-fg);
    padding: 1rem;
    border-radius: .5rem;
    margin-top: 1rem;
    white-space: pre-wrap;
    max-width: 960px
}

input[type="number"] {
    padding: .4rem .6rem;
    border: 1px solid var(--border);
    border-radius: .4rem;
    background: var(--input-bg);
    color: var(--input-fg);
    width: 7rem
}

.muted {
    opacity: .8
}

button {
    padding: 0.6rem 1.4rem;
    margin-right: 0.5rem;
    border: none;
    border-radius: 0.45rem;
    background: linear-gradient(90deg, #4f8cff 0%, #2356c7 100%);
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(79, 140, 255, 0.08);
    cursor: pointer;
    transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
    outline: none;
}

button:disabled {
    background: #bfc9db;
    color: #e6e6e6;
    cursor: not-allowed;
    box-shadow: none;
}

button:hover:not(:disabled),
button:focus-visible:not(:disabled) {
    background: linear-gradient(90deg, #2356c7 0%, #4f8cff 100%);
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 4px 16px rgba(79, 140, 255, 0.15);
}

#darkModeToggle {
    background: linear-gradient(90deg, #222 0%, #444 100%);
    color: #ffe066;
    box-shadow: 0 2px 8px rgba(34, 34, 34, 0.08);
}

.dark-mode button {
    background: linear-gradient(90deg, #222 0%, #444 100%);
    color: #ffe066;
    box-shadow: 0 2px 8px rgba(34, 34, 34, 0.08);
}

.dark-mode button:disabled {
    background: #333;
    color: #888;
}

.dark-mode button:hover:not(:disabled),
.dark-mode button:focus-visible:not(:disabled) {
    background: linear-gradient(90deg, #444 0%, #222 100%);
    color: #fffbe6;
    box-shadow: 0 4px 16px rgba(34, 34, 34, 0.15);
}
.footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100vw;
    background: var(--card-bg);
    color: var(--fg);
    text-align: center;
    padding: 0.7rem 0;
    font-size: 1rem;
    border-top: 1px solid var(--border);
    z-index: 100;
}

.dark-mode .footer {
    background: var(--bg);
    color: var(--fg);
    border-top: 1px solid var(--border);
}