body {
  margin: 0;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* --- MAIN MENU OVERLAY --- */
#main-menu {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(30, 41, 59, 0.95); /* Dark blue-grey, slight opacity */
    backdrop-filter: blur(8px);
    z-index: 2000; /* Highest priority */
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.4s ease-in-out, opacity 0.4s ease-in-out;
}

#main-menu.hidden {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

.menu-content {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.game-title {
    font-size: 32px;
    font-weight: 800;
    color: #1e293b;
    margin: 0 0 30px 0;
    letter-spacing: -1px;
    text-transform: uppercase;
    background: -webkit-linear-gradient(45deg, #2563EB, #10B981);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.menu-group {
    margin-bottom: 20px;
    text-align: left;
}

.menu-group.row {
    display: flex;
    gap: 10px;
}

.menu-group label {
    display: block;
    font-size: 12px;
    font-weight: bold;
    color: #64748b;
    margin-bottom: 5px;
    text-transform: uppercase;
}

select {
    width: 100%;
    padding: 10px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    font-size: 14px;
    background: #f8fafc;
}

/* Start Button Specifics */
.btn-start {
    width: 100%;
    padding: 15px;
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 10px;
    transition: all 0.3s;
    background-color: #94a3b8; /* Gray initially */
    color: white;
    cursor: not-allowed;
}

.btn-start.ready {
    background-color: #10B981; /* Green */
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-start.ready:hover {
    background-color: #059669;
    transform: translateY(-2px);
}

/* --- HUD BUTTONS --- */
#ui-toggle {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 100;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    font-size: 20px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
}

#menu-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 100;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    font-size: 20px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
}

/* --- EXISTING UI CONTAINER --- */
#ui-container {
    position: absolute;
    top: 70px; 
    left: 20px;
    width: 280px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    user-select: none;
    max-height: 80vh;
    overflow-y: auto;
    transition: transform 0.3s ease, opacity 0.3s ease;
    transform-origin: top left;
}

#ui-container.hidden {
    transform: scale(0.95);
    opacity: 0;
    pointer-events: none;
}

.header h2 { margin: 0 0 5px 0; font-size: 18px; color: #333; }
.header p { margin: 0; font-size: 12px; color: #666; }
.section { margin-top: 20px; border-top: 1px solid #eee; padding-top: 15px; }
.section h3 { margin: 0 0 10px 0; font-size: 14px; text-transform: uppercase; color: #888; letter-spacing: 0.5px; }
.stat-row { display: flex; justify-content: space-between; font-weight: bold; margin-bottom: 10px; font-size: 16px; }
.button-row { display: flex; gap: 10px; }

button {
    flex: 1;
    padding: 8px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    transition: opacity 0.2s;
}
button:hover { opacity: 0.8; }
.primary { background-color: #2563EB; color: white; }
.danger { background-color: #ef4444; color: white; }
.secondary { background-color: #e5e7eb; color: #374151; }

#route-list { list-style: none; padding: 0; margin: 0; }
#route-list li {
    background: #f3f4f6;
    margin-bottom: 8px;
    padding: 10px;
    border-radius: 6px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    gap: 5px;
}
#route-list li span { flex-grow: 1; font-weight: 500; }
.btn-icon { flex: 0 0 auto; padding: 4px 8px; font-size: 12px; margin-left: 2px; }