:root {
    --bg-color: #f4f4f9;
    --card-bg: #ffffff;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --focus-ring: rgba(37, 99, 235, 0.15);
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --input-bg: #ffffff;
    --badge-bg: #e5e7eb;
    --result-bg: #eff6ff;
    --result-border: #bfdbfe;
    --result-text: #1e40af;
    --success: #059669;
    --danger: #dc2626;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --card-bg: #1e293b;
        --primary: #3b82f6;
        --primary-hover: #2563eb;
        --focus-ring: rgba(59, 130, 246, 0.3);
        --text-main: #e5e7eb;
        --text-muted: #94a3b8;
        --border: #334155;
        --input-bg: #0f172a;
        --badge-bg: #334155;
        --result-bg: #172554;
        --result-border: #1e40af;
        --result-text: #bfdbfe;
        --success: #34d399;
        --danger: #f87171;
    }
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 20px;
    margin: 0;
}

[hidden] {
    display: none !important;
}

.container {
    background: var(--card-bg);
    width: 100%;
    max-width: 700px;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

h1 {
    margin-top: 0;
    font-size: 1.5rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1.25rem;
}

label,
.label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0.5rem 0 0;
}

input[type="text"] {
    width: 100%;
    padding: 0.75rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-main);
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

button[type="submit"] {
    width: 100%;
    background-color: var(--primary);
    color: white;
    font-weight: 600;
    padding: 0.75rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
    transition: background 0.2s;
}

button[type="submit"]:hover {
    background-color: var(--primary-hover);
}

.result-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.copy-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 2px 10px;
    cursor: pointer;
}

.copy-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
}

.result-box {
    background-color: var(--result-bg);
    border: 1px solid var(--result-border);
    color: var(--result-text);
    padding: 1rem;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 1.1rem;
    word-break: break-all;
    margin-bottom: 1rem;
}

.details-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    margin-top: 1rem;
}

.details-table th,
.details-table td {
    text-align: left;
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.details-table th {
    color: var(--text-muted);
    width: 40%;
}

.details-table td {
    font-family: var(--font-mono);
    word-break: break-all;
}

.success { color: var(--success); font-weight: bold; }
.fail { color: var(--danger); font-weight: bold; }
.error { color: var(--danger); margin-top: 0.5rem; }

.badge {
    display: inline-block;
    background: var(--badge-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-left: 8px;
    color: var(--text-muted);
    vertical-align: middle;
}

@media (max-width: 480px) {
    body { padding: 12px; }
    .container { padding: 1.25rem; }
    .details-table th { width: auto; }
}