:root {
    --kdw: #0066cc;
    --strom: #cc0000;
    --kueg: #00aa00;
    --background: #ffffff;
    --foreground: #0f172a;
    --muted: #64748b;
    --border: #e2e8f0;
    --card: #ffffff;
    --sidebar: #f8fafc;
    --primary: #0f172a;
    --primary-fg: #ffffff;
    --destructive: #ef4444;
    --destructive-fg: #ffffff;
    --secondary: #f1f5f9;
    --secondary-fg: #0f172a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background);
    color: var(--foreground);
    height: 100vh;
    overflow: hidden;
    user-select: none;
}

.app-container {
    display: flex;
    height: 100%;
    width: 100%;
}

/* Sidebar */
.sidebar {
    width: 320px;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    background-color: var(--card);
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 24px rgba(0,0,0,0.05);
    z-index: 10;
}

.logo-container {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    background-color: var(--sidebar);
    display: flex;
    justify-content: center;
}

.logo {
    max-width: 100%;
    height: auto;
    object-fit: contain;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.section-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.tools-grid {
    display: grid;
    gap: 12px;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 48px;
    padding: 0 16px;
    width: 100%;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn:hover {
    background-color: var(--secondary);
}

.tool-btn.active {
    color: white;
    border-color: transparent;
}

.tool-btn.active#btn-kdw { background-color: var(--kdw); }
.tool-btn.active#btn-strom { background-color: var(--strom); }
.tool-btn.active#btn-kueg { background-color: var(--kueg); }

.tool-indicator {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid currentColor;
}

.tool-btn.active .tool-indicator {
    border-color: white;
    background-color: white;
}

.tool-indicator.kdw { border-color: var(--kdw); }
.tool-indicator.strom { border-color: var(--strom); }
.tool-indicator.kueg { border-color: var(--kueg); }

.actions-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding-top: 8px;
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 36px;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: opacity 0.2s;
}

.action-btn.delete-all {
    background-color: var(--destructive);
    color: var(--destructive-fg);
}

.action-btn.delete-last {
    background-color: var(--secondary);
    color: var(--secondary-fg);
}

.action-btn:hover {
    opacity: 0.9;
}

.separator {
    height: 1px;
    background-color: var(--border);
    width: 100%;
}

/* Result Card */
.result-card {
    background-color: #f0fdf4; /* green-50 */
    border: 1px solid #bbf7d0; /* green-200 */
    border-radius: 8px;
    margin-top: auto;
    /* Removed overflow: hidden to allow content to be seen if it expands */
    display: flex;
    flex-direction: column;
    flex-shrink: 0; /* Ensure the card itself doesn't shrink */
}

.card-header {
    padding: 16px 16px 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: #166534; /* green-800 */
}

.card-content {
    padding: 0 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow-y: auto; /* Allow scrolling if content is too tall */
    max-height: 300px; /* Safety limit */
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    border-bottom: 1px solid #bbf7d0;
    padding-bottom: 4px;
    flex-shrink: 0; /* Prevent shrinking */
}

.result-row:last-child {
    border-bottom: none;
    padding-top: 4px;
}

.label { font-weight: 500; }
.label.kdw { color: var(--kdw); }
.label.strom { color: var(--strom); }
.label.kueg { color: var(--kueg); }
.label.bs { color: #166534; font-weight: 700; }

.value {
    font-family: monospace;
    font-weight: 700;
}

.value.bs {
    font-size: 1.125rem;
    color: #14532d; /* green-900 */
}

.export-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 40px;
    width: 100%;
    background-color: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    margin-top: 16px;
}

.export-btn:hover {
    background-color: var(--secondary);
}

/* Canvas Area */
.canvas-area {
    flex: 1;
    position: relative;
    background-color: #fdfdfd;
    overflow: hidden;
    cursor: default;
}

.canvas-area.drawing {
    cursor: crosshair;
}

.grid-background {
    display: none;
}

.scale-bar {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 40px;
    background-color: rgba(255,255,255,0.8);
    pointer-events: none;
    z-index: 20;
    display: block; /* Ensure visibility */
}

.scale-bar.left { left: 0; border-right: 1px solid var(--border); }
.scale-bar.right { right: 0; border-left: 1px solid var(--border); }

.scale-tick {
    position: absolute;
    width: 8px;
    height: 1px;
    background-color: #94a3b8;
}

.scale-label {
    position: absolute;
    font-size: 10px;
    font-family: monospace;
    color: #64748b;
}

.main-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.active-tool-indicator {
    position: absolute;
    top: 16px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(255,255,255,0.9);
    backdrop-filter: blur(4px);
    padding: 8px 16px;
    border-radius: 9999px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 30;
    animation: slideDown 0.3s ease-out;
}

.active-tool-indicator.hidden {
    display: none;
}

@keyframes slideDown {
    from { transform: translate(-50%, -100%); opacity: 0; }
    to { transform: translate(-50%, 0); opacity: 1; }
}

.center-btn {
    position: absolute;
    bottom: 24px;
    right: 56px;
    display: flex;
    align-items: center;
    gap: 8px;
    height: 36px;
    padding: 0 12px;
    background-color: var(--secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    z-index: 30;
}

.center-btn:hover {
    background-color: #e2e8f0;
}

/* Vector Labels */
.vector-label {
    background-color: rgba(255,255,255,0.95);
    backdrop-filter: blur(2px);
    border: 2px solid;
    border-radius: 4px;
    padding: 2px 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    font-family: monospace;
    font-size: 12px;
    text-align: center;
    white-space: nowrap;
    pointer-events: none;
}

.vector-label-title {
    font-weight: bold;
    text-transform: uppercase;
}