:root {
    color-scheme: light dark;
    --bg: #0f172a;
    --panel: #111827;
    --panel-border: #1f2937;
    --text: #f8fafc;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --success: #34d399;
    --error: #f87171;
    --code-bg: #020617;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top, rgba(56, 189, 248, 0.18), transparent 35%),
        var(--bg);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.card {
    width: min(100%, 560px);
    background: rgba(17, 24, 39, 0.92);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

h1 {
    margin: 0 0 8px;
    font-size: 1.75rem;
    letter-spacing: -0.02em;
}

.subtitle {
    margin: 0 0 28px;
    color: var(--muted);
    line-height: 1.5;
}

.code-display {
    background: var(--code-bg);
    border: 1px dashed #334155;
    border-radius: 16px;
    padding: 28px 20px;
    text-align: center;
    margin-bottom: 20px;
}

.code-label {
    display: block;
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.code-value {
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 700;
    letter-spacing: 0.2em;
    font-variant-numeric: tabular-nums;
    min-height: 1.2em;
}

.status {
    min-height: 1.5rem;
    margin-bottom: 20px;
    font-size: 0.95rem;
    color: var(--muted);
}

.status.success {
    color: var(--success);
}

.status.error {
    color: var(--error);
}

.actions {
    display: flex;
    gap: 12px;
    margin-bottom: 28px;
}

.manual {
    margin-bottom: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--panel-border);
}

.manual h2 {
    margin: 0 0 8px;
    font-size: 1rem;
}

.manual-help {
    margin: 0 0 14px;
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

.manual-form {
    display: flex;
    gap: 12px;
}

.prefix-section {
    margin-bottom: 24px;
}

.prefix-section label {
    display: block;
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.prefix-row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.prefix-input {
    width: 88px;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    text-align: center;
    background: var(--code-bg);
    color: var(--text);
}

.prefix-input:focus {
    outline: 2px solid rgba(56, 189, 248, 0.45);
    border-color: var(--accent);
}

.prefix-input:disabled {
    opacity: 0.6;
}

.prefix-meta {
    flex: 1;
    color: var(--muted);
    font-size: 0.9rem;
    line-height: 1.45;
}

.prefix-meta strong {
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.manual-form input[type="text"]:not(.prefix-input) {
    flex: 1;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    font-variant-numeric: tabular-nums;
    background: var(--code-bg);
    color: var(--text);
}

.manual-form input:focus {
    outline: 2px solid rgba(56, 189, 248, 0.45);
    border-color: var(--accent);
}

.manual-form input:disabled {
    opacity: 0.6;
}

.manual-form button {
    flex: 0 0 auto;
    min-width: 120px;
}

button {
    flex: 1;
    border: none;
    border-radius: 12px;
    padding: 14px 18px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease, opacity 0.15s ease;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

button:not(:disabled):hover {
    transform: translateY(-1px);
}

.primary {
    background: var(--accent);
    color: #082f49;
}

.primary:not(:disabled):hover {
    background: var(--accent-hover);
}

.secondary {
    background: #1e293b;
    color: var(--text);
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.stat {
    background: #0b1220;
    border: 1px solid #1e293b;
    border-radius: 12px;
    padding: 14px;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--muted);
    margin-bottom: 6px;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
}

.banner {
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.35);
    color: #fecaca;
    padding: 12px 14px;
    border-radius: 12px;
    margin-bottom: 20px;
    line-height: 1.5;
}