/* ========================================
   State Machine Builder — Blueprint Blue Theme
   ======================================== */
:root {
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --primary-glow: rgba(59, 130, 246, 0.2);
    --secondary: #60A5FA;
    --accent: #93C5FD;
    --bg: #0C1220;
    --bg-card: rgba(14, 20, 34, 0.9);
    --border: rgba(59, 130, 246, 0.12);
    --border-hover: rgba(59, 130, 246, 0.35);
    --text: #E2E8F0;
    --text-secondary: #8BA2C0;
    --text-muted: #5A7599;
    --radius: 8px;
    --font: 'Inter', -apple-system, sans-serif;
    --mono: 'JetBrains Mono', monospace;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.toolbar-left,
.toolbar-center,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.logo {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.logo strong {
    color: var(--text);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tool-btn {
    padding: 0.35rem 0.6rem;
    border: 1px solid var(--border);
    background: transparent;
    border-radius: var(--radius);
    font-family: var(--font);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.tool-btn:hover {
    border-color: var(--primary);
    color: var(--text);
    background: rgba(59, 130, 246, 0.08);
}

.tool-btn.active {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--primary);
    color: var(--text);
}

/* Workspace */
.workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.canvas {
    flex: 1;
    background: var(--bg);
    cursor: crosshair;
}

.canvas .state-node {
    cursor: grab;
}

.canvas .state-node:active {
    cursor: grabbing;
}

.canvas .state-rect {
    fill: rgba(14, 20, 34, 0.85);
    stroke: var(--primary);
    stroke-width: 2;
    rx: 8;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.canvas .state-rect.selected {
    stroke: var(--accent);
    stroke-width: 3;
    filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.3));
}

.canvas .state-rect.initial {
    stroke-dasharray: none;
}

.canvas .state-rect.final {
    stroke-width: 3;
    stroke: #F59E0B;
}

.canvas .state-rect.sim-active {
    fill: rgba(59, 130, 246, 0.15);
    stroke: var(--accent);
    filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.4));
}

.canvas .state-label {
    fill: var(--text);
    font-family: var(--font);
    font-size: 12px;
    font-weight: 600;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
}

.canvas .state-badge {
    fill: var(--text-muted);
    font-family: var(--font);
    font-size: 9px;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
}

.canvas .transition-line {
    stroke: var(--secondary);
    stroke-width: 2;
    fill: none;
    marker-end: url(#arrowhead);
    cursor: pointer;
}

.canvas .transition-line:hover {
    stroke: var(--accent);
    stroke-width: 3;
}

.canvas .transition-line.selected {
    stroke: var(--accent);
    stroke-width: 3;
}

.canvas .trans-label {
    fill: var(--text-secondary);
    font-family: var(--mono);
    font-size: 10px;
    text-anchor: middle;
    dominant-baseline: central;
    pointer-events: none;
}

/* Inspector */
.inspector {
    width: 260px;
    background: var(--bg-card);
    border-left: 1px solid var(--border);
    padding: 1rem;
    overflow-y: auto;
    flex-shrink: 0;
}

.inspector-empty {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: center;
    padding: 2rem 0;
}

.inspector h3 {
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--accent);
}

.inspector label {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.inspector input[type="text"] {
    padding: 0.4rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(10, 14, 24, 0.7);
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.78rem;
    outline: none;
}

.inspector input[type="text"]:focus {
    border-color: var(--primary);
}

.inspector input[type="checkbox"] {
    accent-color: var(--primary);
}

.btn-danger {
    width: 100%;
    padding: 0.4rem;
    border: 1px solid rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.08);
    border-radius: 6px;
    color: #F87171;
    font-family: var(--font);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 0.5rem;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.15);
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 0.55rem 1rem;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.82rem;
    font-weight: 500;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 100;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.hidden {
    display: none !important;
}

@media (max-width: 700px) {
    .inspector {
        display: none;
    }
}