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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: #f0f0f0;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    margin-bottom: 16px;
    border-bottom: 2px solid #007acc;
    padding-bottom: 10px;
}

header h1 { margin: 0 0 4px; font-size: 1.5em; }

/* ---- toolbar ---- */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 8px 12px;
    margin-bottom: 10px;
}

.toolbar label { font-size: 0.85em; color: #555; white-space: nowrap; }

.toolbar select,
.toolbar input[type="number"],
.toolbar input[type="text"] {
    font-size: 0.85em;
    padding: 3px 6px;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: #fafafa;
}

.toolbar input[type="number"] { width: 80px; }

.sep { width: 1px; height: 24px; background: #ddd; margin: 0 4px; }

button {
    padding: 5px 12px;
    background: #007acc;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85em;
    white-space: nowrap;
}
button:hover { background: #005fa3; }
button.danger { background: #c0392b; }
button.danger:hover { background: #a93226; }
button.secondary { background: #555; }
button.secondary:hover { background: #333; }

/* ---- main layout ---- */
.main { display: flex; gap: 10px; }

/* ---- canvas panel ---- */
.canvas-wrap {
    flex: 1;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
    min-height: 420px;
}

#plot {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

/* ---- right panel ---- */
.side {
    width: 220px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.panel {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 10px 12px;
}

.panel h3 {
    margin: 0 0 8px;
    font-size: 0.85em;
    color: #555;
    text-transform: uppercase;
    letter-spacing: .04em;
}

.field-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
    font-size: 0.82em;
}

.field-row label { flex: 0 0 50px; color: #666; }
.field-row input { flex: 1; width: 0; min-width: 0; }

.point-list {
    max-height: 180px;
    overflow-y: auto;
    font-size: 0.8em;
    font-family: 'Consolas', monospace;
}

.point-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2px 4px;
    border-radius: 3px;
    cursor: pointer;
}

.point-row:hover { background: #f0f0f0; }
.point-row.selected { background: #e3f0ff; }

.point-row .del-btn {
    padding: 0 4px;
    background: transparent;
    color: #c00;
    font-size: 0.9em;
    border: none;
    cursor: pointer;
    line-height: 1;
}
.point-row .del-btn:hover { background: #fee; border-radius: 2px; }

/* ---- status bar ---- */
.statusbar {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 5px 10px;
    font-size: 0.78em;
    color: #555;
    margin-top: 8px;
    min-height: 26px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

/* ---- output ---- */
.output-area {
    width: 100%;
    font-family: 'Consolas', monospace;
    font-size: 0.78em;
    padding: 6px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
    min-height: 52px;
    background: #fafafa;
    color: #222;
    white-space: pre-wrap;
    word-break: break-all;
}

.snap-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.snap-row input[type="checkbox"] { margin: 0; }
.snap-row label { font-size: 0.85em; }

.snap-fields {
    display: flex;
    gap: 6px;
    align-items: center;
    font-size: 0.82em;
    margin-top: 4px;
}
.snap-fields input { width: 64px; }
.snap-fields label { color: #666; }