:root {
    --bg: #0e1116;
    --card: #151a22;
    --txt: #e9eef5;
    --muted: #9fb0c3;
    --pri: #4ea1ff;
}

* {
    box-sizing: border-box
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--txt);
    font: 14px/1.5 system-ui, Segoe UI, Roboto, Ubuntu
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: #0b0e13;
    border-bottom: 1px solid #222
}

header h1 {
    font-size: 18px;
    margin: 0
}

nav a {
    color: var(--muted);
    margin-left: 16px;
    text-decoration: none
}

nav a:hover {
    color: var(--txt)
}

main {
    max-width: 960px;
    margin: 24px auto;
    padding: 0 16px
}

.card {
    background: var(--card);
    border: 1px solid #222;
    border-radius: 12px;
    padding: 16px 16px 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .25)
}

.card h2 {
    margin: 0 0 8px
}

#jsonInput {
    width: 100%;
    min-height: 220px;
    background: #0f131a;
    color: var(--txt);
    border: 1px solid #222;
    border-radius: 8px;
    padding: 12px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace
}

.actions {
    display: flex;
    gap: 12px;
    margin: 12px 0
}

button {
    background: var(--pri);
    border: none;
    border-radius: 8px;
    color: #00183a;
    padding: 10px 14px;
    font-weight: 700;
    cursor: pointer
}

button[disabled] {
    opacity: .5;
    cursor: not-allowed
}

pre {
    white-space: pre-wrap;
    background: #0f131a;
    border: 1px solid #222;
    border-radius: 8px;
    padding: 12px;
    max-height: 360px;
    overflow: auto
}

footer {
    max-width: 960px;
    margin: 24px auto;
    padding: 0 16px;
    color: var(--muted)
}