:root {
    --bg: #f3f4f6;
    --panel: #ffffff;
    --ink: #1f2937;
    --muted: #6b7280;
    --line: #d1d5db;
    --button: #374151;
    --button-hover: #111827;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--ink);
}

.wrap {
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px 16px 40px;
}

.hero {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 16px;
    margin-bottom: 20px;
}

h1 {
    margin: 0 0 8px;
    font-size: 2rem;
}

.subtitle {
    margin: 0;
    color: var(--muted);
}

.hero-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 16px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 16px;
}

.panel-main {
    grid-column: 1 / 2;
}

h2 {
    margin-top: 0;
    margin-bottom: 14px;
    font-size: 1.1rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.field {
    display: flex;
    flex-direction: column;
}

.field-wide {
    grid-column: 1 / -1;
}

.stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

label {
    margin-bottom: 6px;
    font-weight: 600;
}

input,
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--line);
    border-radius: 6px;
    font-size: 0.95rem;
    background: #fff;
}

button {
    margin-top: 12px;
    align-self: flex-start;
    border: none;
    border-radius: 6px;
    padding: 10px 14px;
    background: var(--button);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

button:hover {
    background: var(--button-hover);
}

button.secondary {
    background: #9ca3af;
}

button.secondary:hover {
    background: #6b7280;
}

.result-panel {
    margin-top: 16px;
}

.result {
    margin: 0;
    min-height: 200px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #f9fafb;
    color: #111827;
    white-space: pre-wrap;
    overflow: auto;
}

.table-wrap {
    overflow-x: auto;
}

.result-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    background: #f9fafb;
    border: 1px solid var(--line);
    border-radius: 6px;
    overflow: hidden;
}

.result-table th,
.result-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--line);
    text-align: left;
}

.result-table th {
    background: #e5e7eb;
    font-weight: 700;
}

.result-table tbody tr:nth-child(even) {
    background: #f3f4f6;
}

.hidden {
    display: none;
}

@media (max-width: 850px) {
    .hero {
        flex-direction: column;
        align-items: stretch;
    }

    .layout {
        grid-template-columns: 1fr;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .field-wide {
        grid-column: auto;
    }
}